CN102482730A - Unfired carbon-containing agglomerate for blast furnaces and production method therefor - Google Patents
Unfired carbon-containing agglomerate for blast furnaces and production method therefor Download PDFInfo
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- 229910052799 carbon Inorganic materials 0.000 title claims abstract description 240
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title claims abstract description 228
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 23
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 77
- 239000000463 material Substances 0.000 claims abstract description 59
- 229910052742 iron Inorganic materials 0.000 claims abstract description 36
- 238000000034 method Methods 0.000 claims abstract description 35
- 238000000465 moulding Methods 0.000 claims abstract description 27
- 238000002156 mixing Methods 0.000 claims abstract description 22
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 18
- 230000015572 biosynthetic process Effects 0.000 claims abstract description 12
- 239000000377 silicon dioxide Substances 0.000 claims abstract description 9
- 239000000292 calcium oxide Substances 0.000 claims description 109
- 239000002893 slag Substances 0.000 claims description 77
- 229910004298 SiO 2 Inorganic materials 0.000 claims description 75
- 239000003795 chemical substances by application Substances 0.000 claims description 42
- 239000002994 raw material Substances 0.000 claims description 25
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims description 14
- 238000012423 maintenance Methods 0.000 claims description 13
- 230000001105 regulatory effect Effects 0.000 claims description 12
- 229910052759 nickel Inorganic materials 0.000 claims description 7
- 229910052599 brucite Inorganic materials 0.000 claims description 4
- 239000001095 magnesium carbonate Substances 0.000 claims description 4
- 235000014380 magnesium carbonate Nutrition 0.000 claims description 4
- ZLNQQNXFFQJAID-UHFFFAOYSA-L magnesium carbonate Chemical compound [Mg+2].[O-]C([O-])=O ZLNQQNXFFQJAID-UHFFFAOYSA-L 0.000 claims description 4
- 229910000021 magnesium carbonate Inorganic materials 0.000 claims description 4
- WYTGDNHDOZPMIW-RCBQFDQVSA-N alstonine Natural products C1=CC2=C3C=CC=CC3=NC2=C2N1C[C@H]1[C@H](C)OC=C(C(=O)OC)[C@H]1C2 WYTGDNHDOZPMIW-RCBQFDQVSA-N 0.000 claims description 2
- 239000000203 mixture Substances 0.000 abstract description 18
- 230000008569 process Effects 0.000 abstract description 11
- 239000011230 binding agent Substances 0.000 abstract description 8
- 229910052681 coesite Inorganic materials 0.000 abstract 4
- 229910052906 cristobalite Inorganic materials 0.000 abstract 4
- 235000012239 silicon dioxide Nutrition 0.000 abstract 4
- 229910052682 stishovite Inorganic materials 0.000 abstract 4
- 229910052905 tridymite Inorganic materials 0.000 abstract 4
- 238000004898 kneading Methods 0.000 abstract 1
- ODINCKMPIJJUCX-UHFFFAOYSA-N Calcium oxide Chemical compound [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 198
- 235000012255 calcium oxide Nutrition 0.000 description 98
- 239000002184 metal Substances 0.000 description 60
- 229910052751 metal Inorganic materials 0.000 description 60
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 45
- 238000006722 reduction reaction Methods 0.000 description 34
- 230000009467 reduction Effects 0.000 description 32
- 230000001603 reducing effect Effects 0.000 description 29
- 230000002829 reductive effect Effects 0.000 description 19
- 239000004568 cement Substances 0.000 description 15
- 230000000694 effects Effects 0.000 description 15
- 239000000428 dust Substances 0.000 description 14
- 238000007906 compression Methods 0.000 description 12
- 230000006835 compression Effects 0.000 description 12
- 230000035699 permeability Effects 0.000 description 10
- 239000000571 coke Substances 0.000 description 9
- 239000002245 particle Substances 0.000 description 7
- 230000004927 fusion Effects 0.000 description 6
- 239000003595 mist Substances 0.000 description 6
- 238000005245 sintering Methods 0.000 description 6
- 239000003575 carbonaceous material Substances 0.000 description 5
- 230000008859 change Effects 0.000 description 5
- 239000010410 layer Substances 0.000 description 5
- 238000011068 loading method Methods 0.000 description 5
- 239000012256 powdered iron Substances 0.000 description 5
- 239000011398 Portland cement Substances 0.000 description 4
- 238000002485 combustion reaction Methods 0.000 description 4
- 238000010304 firing Methods 0.000 description 4
- 238000005469 granulation Methods 0.000 description 4
- 230000003179 granulation Effects 0.000 description 4
- 239000004615 ingredient Substances 0.000 description 4
- 239000007788 liquid Substances 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 3
- 239000003245 coal Substances 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 3
- 239000000470 constituent Substances 0.000 description 3
- 238000012856 packing Methods 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- SZVJSHCCFOBDDC-UHFFFAOYSA-N iron(II,III) oxide Inorganic materials O=[Fe]O[Fe]O[Fe]=O SZVJSHCCFOBDDC-UHFFFAOYSA-N 0.000 description 2
- 239000008188 pellet Substances 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 230000000630 rising effect Effects 0.000 description 2
- 229920006395 saturated elastomer Polymers 0.000 description 2
- 238000007493 shaping process Methods 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 238000009423 ventilation Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 241000270311 Crocodylus niloticus Species 0.000 description 1
- 241000220317 Rosa Species 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 239000012790 adhesive layer Substances 0.000 description 1
- 238000005273 aeration Methods 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 description 1
- 150000001721 carbon Chemical class 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 239000003610 charcoal Substances 0.000 description 1
- 238000005097 cold rolling Methods 0.000 description 1
- 238000005094 computer simulation Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
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- 238000006731 degradation reaction Methods 0.000 description 1
- 238000006297 dehydration reaction Methods 0.000 description 1
- 230000000994 depressogenic effect Effects 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000006253 efflorescence Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 238000011049 filling Methods 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 239000013505 freshwater Substances 0.000 description 1
- 239000008187 granular material Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000006703 hydration reaction Methods 0.000 description 1
- 239000007791 liquid phase Substances 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000012797 qualification Methods 0.000 description 1
- 206010037844 rash Diseases 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000007790 solid phase Substances 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- 238000009156 water cure Methods 0.000 description 1
- 235000020985 whole grains Nutrition 0.000 description 1
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-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B5/00—Making pig-iron in the blast furnace
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B5/00—Making pig-iron in the blast furnace
- C21B5/007—Conditions of the cokes or characterised by the cokes used
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B5/00—Making pig-iron in the blast furnace
- C21B5/008—Composition or distribution of the charge
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B1/00—Preliminary treatment of ores or scrap
- C22B1/14—Agglomerating; Briquetting; Binding; Granulating
- C22B1/24—Binding; Briquetting ; Granulating
- C22B1/242—Binding; Briquetting ; Granulating with binders
- C22B1/243—Binding; Briquetting ; Granulating with binders inorganic
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B1/00—Preliminary treatment of ores or scrap
- C22B1/14—Agglomerating; Briquetting; Binding; Granulating
- C22B1/24—Binding; Briquetting ; Granulating
- C22B1/242—Binding; Briquetting ; Granulating with binders
- C22B1/244—Binding; Briquetting ; Granulating with binders organic
- C22B1/245—Binding; Briquetting ; Granulating with binders organic with carbonaceous material for the production of coked agglomerates
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Mechanical Engineering (AREA)
- Inorganic Chemistry (AREA)
- Manufacture And Refinement Of Metals (AREA)
Abstract
Disclosed is an unfired carbon-containing agglomerate that has a carbon content (T.C) in the range of 18 to 25 mass%, and a CaO/SiO2 ratio of CaO content (mass%) and SiO2 content (mass%) in the range of 1.0 to 2.0. Also provided is a production method for the unfired carbon-containing agglomerate that is provided with a molded body formation process for obtaining a molded body by mixing and kneading iron-containing materials, carbon-containing materials, and a binder, and molding the kneaded mixture; and a process for obtaining the unfired carbon-containing agglomerate by subsequently curing the aforementioned molded body. In the aforementioned molded body formation process, one or more combination conditions selected from a group comprising the ore type and the combination quantity of the binder are adjusted in a manner such that the carbon content (T.C) of the aforementioned unfired carbon-containing agglomerate becomes in the range of 18 to 25 mass% and the CaO/SiO2 ratio of the CaO content (mass%) and the SiO2 content (mass%) in gangue components becomes in the range of 1.0 to 2.0.
Description
Technical field
What the present invention relates to that blast furnace uses non-ly burns till the carbon containing lump ore, thereby particularly relates to the non-carbon containing lump ore that burns till that the stove bottom slag fusing point that reduces blast furnace can reduce the reducing material ratio of blast furnace.
The application based on August 21st, 2009 spy in japanese publication be willing to advocate right of priority 2009-191966 number, and here cite its content.
Background technology
In the past; Multiple iron dust containing and carbon containing dust that will recovery from the various particle collectors etc. in system ironworks cooperate; Add the water cure adhesive of cement class and carry out mixing, moulding, thereby make the non-lump ore that burns till of 8～16mm diameter, it is used as blast furnace raw material.
As non-method of manufacture of burning till the carbon containing lump ore, known have: Magnetite (processed) dirt is carried out particle is processed in granulation, then the maintenance particle makes its solidified method.Above-mentioned Magnetite (processed) dirt is carried out granulation, and to process the particulate operation be that size-grade distribution with dust is adjusted to suitable scope; Add the moisture of tackiness agent such as unslaked lime, cement and 5～15%; Mixture is carried out granulation through granulating disc etc., thereby obtain particle.
In so non-manufacturing of burning till the carbon containing lump ore,, also require to improve non-carbon content (T.C) of burning till the carbon containing lump ore in order to reduce the reducing material ratio in the blast furnace operation.
For example, patent documentation 1 discloses the cooperation iron oxide-containing materials and carbon is carbon material, adds tackiness agent and carries out mixing, moulding, maintenance, thereby the non-lump ore that burns till of carbon is housed in making.Should in carbon is housed the non-lump ore that burns till have 80～120% the carbon that the iron oxide reduction that is contained in the iron oxide-containing materials is formed the needed theoretical carbon amount of metallic iron.In addition, reach 7850kN/m with the ultimate compression strength under the normal temperature
2Above mode is selected tackiness agent, mixes, moulding, maintenance.Non-ly burn till red stone in the carbon containing lump ore, reduction ratio is improved owing to built-in carbon causes reduction reaction.
But, in this method of manufacture, limit carbon content in order to ensure intensity, can't fully be cut down the effect of the reducing material ratio in the blast furnace.In order to obtain cutting down the effect of reducing material ratio fully, a large amount of use under this non-situation of burning till the carbon containing lump ore in blast furnace, the caloric receptivity that in blast furnace, is produced by the dehydration reaction of tackiness agent increases.Thus, has the shortcoming that forms low-temperature heat preservation band, encourages the reduction degradation of agglomerate.
In addition, as tackiness agent, most unslaked lime and CaO series cements of using, the therefore non-CaO content that burns till in the carbon containing lump ore improves.Therefore, in reaction process, increase by the non-excess stickiness that burns till the fused solution of carbon containing lump ore generation.Thus, obstruction generates the cohesion of metal and burns.Thus, have the ventilation of the stove bottom that makes blast furnace, the shortcoming of logical fluidity variation.
For example, if the non-fusion at low temperatures of carbon containing lump ore, the drippage of burning till then in shaft furnace, non-ly burns till the fusion in early days of carbon containing lump ore, flow to the gap of the raw material of in stove, filling easily.Under this situation, prolong during contacting with coke.Consequently, can promote the carburization reaction of the iron of non-reduction reaction of burning till the powdered iron ore in the carbon containing lump ore and generation.
Even patent documentation 2 is conceived to produce SiO
2, Al
2O
3The powdered iron ore of surface enrichment, also can be through applying CaCO
3Reduce melt temperature.In addition, based on this objective, powdered iron ore and the flux non-carbon containing lump ore that burns till through the coal be combined into has been proposed.
Need to prove, disclose the carbon containing lump ore that contains coal 23.3～24.6 quality % in the patent documentation 2, usually the carbon content of coal is about 70%, and remainder is ash content and volatile component.Therefore, the carbon content in the carbon containing lump ore is equivalent to 16～17 quality %.
On the other hand, about the drippage property of agglomerate and the relation of composition, a large amount of reports have been carried out.
For example, report have in the non-patent literature 1: the drippage temperature of agglomerate is with respect to CaO/SiO
2Be non-linear variation, at CaO/SiO
2Be that the drippage temperature reduce at most near 1.0, and the drippage temperature reduce when MgO is increased.
In addition, in the non-patent literature 2 there be report: when in containing the dust coso pellet (cement-bonded) of 7% carbon, adding 2% MgO, the pyritous aeration resistance reduces.
As stated, well-knownly be to be lower than 10% the agglomerate and the metal drippage property of dust granules, the CaO/SiO that gangue is formed in order to improve carbon content
2With suitableization of MgO.But, the metal of (18～25 quality %) carbon containing lump ore that the diverse carbon content of reduction act is high drippage property and determine the suitable condition of slag fusing point of the stove bottom of this metal drippage property to it be unclear that so far.
In addition, the contriver waits for the high carbon containing lump ore of carbon content (total C content 20%, total Fe content 40%, CaO11%, SiO6%, Al
2O
32.5%, reduction characteristic MgO0.5%) is investigated.Fig. 8 representes in the past agglomerate (total Fe content 58.5%, FeO8%, CaO10%, SiO
25%, Al
2O
3MgO1.0%) and the many carbon containing lump ore temperature of carbon content and the relation of reduction ratio 1.7%.Can know that with reference to Fig. 8 compare with agglomerate in the past, the carbon containing lump ore reduces significantly in low temperature range.This is a big characteristic of the high carbon containing lump ore of carbon content.
Then, use the reduction ratio of Fig. 8 that the result by above-mentioned reduction test obtains, through computer simulation by reducing the slag fusing point (CaO-SiO that produces
2-Al
2O
3-MgO-FeO) variation.Need to prove, in the iron of agglomerate and carbon containing lump ore, suppose that unreduced iron all exists with the form of FeO, calculate the slag fusing point by reduction ratio.The result is shown in Fig. 9.Wherein, fusing point is meant the temperature that all becomes liquid phase, below fusing point, also generates fused solution.But when fusing point was high, the fusion liquid measure reduced, so fusing point is represented the fusion liquid measure indirectly.
Can think that with reference to Fig. 9 agglomerate is consistent basically with specimen temperature at 1200～1400 ℃ of following slag fusing points, in this TR, generate a large amount of fused solutions.Relative therewith, the slag fusing point of carbon containing lump ore significantly rises near 900 ℃, reaches more than 1600 ℃.Therefore can think that the carbon containing lump ore that carbon content is high reduces under the few state of fusion liquid measure.Therefore, there is solid phase usually, thereby hinders the cohesion of above-mentioned metal, become the reason that drippage worsens.At above-mentioned 5 composition system (CaO-SiO
2-Al
2O
3-MgO-FeO) in, for the high carbon containing lump ore of carbon content, FeO is very big to the influence of fusing point, reduces apace at low temperatures.Result shown in Fig. 9 is the high peculiar phenomenon of carbon containing lump ore of carbon content.
As stated, compare with agglomerate, the reduction of the carbon containing lump ore that carbon content is high is carried out in low temperature range significantly, under the few state of fusion liquid measure, reduces.Therefore, for the opinion of the ongoing drippage characteristic of the reduction of agglomerate, can't be directly applied for the high carbon containing lump ore of carbon content.
When in blast furnace, using the carbon containing lump ore, under the high situation of slag fusing point, the cohesive zone lower surface descends, and dropping zone zone, bottom narrows down, and the slag hold-up of dropping zone and combustion chamber portion increases.In detail, in dropping zone and combustion chamber portion (metal and slag carry out the isolating zone that flows to depressed portions simultaneously of proportion), flowing of fused solution is not smooth, and fused solution is detained at space part (stream).Thus, gas flow generation bias current can't be carried out uniform gas heating.Therefore, occur hot insufficient position partly, it is difficult that the stable operation of air permeability of stove bottom becomes.
The prior art document
Patent documentation
Patent documentation 1: TOHKEMY 2003-342646 communique
Patent documentation 2: TOHKEMY 2005-325412 communique
Non-patent literature
Non-patent literature 1:ISIJ International 44 (2004), p.2057
Non-patent literature 2: iron and steel (iron と steel), 70 (1984), p.S825
Summary of the invention
Invent problem to be solved
Among the present invention, will have being used for blast furnace is that the member condition of the carbon containing lump ore of best slag fusing point is carried out specialization.Based on this result of study, the objective of the invention is to, reduce non-carbon containing lump ore and the method for manufacture thereof of burning till that the slag fusing point can reduce the reducing material ratio of blast furnace thereby provide.
Be used to solve the means of problem
The inventor etc. have found a kind of non-carbon containing lump ore finished product that burns till, the CaO/SiO of its gangue content through making the carbon containing lump ore
2In specific scope (1.0～2.0), can reduce stove bottom slag fusing point, thereby can realize good metal drippage property.Also found, in order to make the non-CaO/SiO that burns till the gangue content of carbon containing lump ore
2Be 1.0～2.0, of the back, the preferred adjusting contains high SiO
2Ore and the use level that contains the MgO auxiliary material.
The non-carbon containing lump ore that burns till that the blast furnace of a scheme of the present invention is used is made through following method: with iron-bearing material, carbon raw material and tackiness agent mix, mixing; Mixing thing is shaped; Thereby obtain molding; Then above-mentioned molding is carried out maintenance, wherein carbon content (T.C) is 18～25 quality %, and the CaO content (quality %) and the SiO of gangue content
2The ratio CaO/SiO of content (quality %)
2Be 1.0～2.0.
For the non-carbon containing lump ore that burns till that the blast furnace of a scheme of the present invention is used, also can be by CaO content (quality %), SiO
2Content (quality %), Al
2O
3Gangue the amount ((CaO+SiO of content (quality %), MgO content (quality %) and carbon content (T.C) (quality %) expression
2+ Al
2O
3+ MgO)/(100-carbon content (T.C))) value be below 0.25, and MgO content is more than the 0.5 quality %.
The content of above-mentioned tackiness agent can be 5～10 quality %.
The non-method of manufacture of burning till the carbon containing lump ore that the blast furnace of a scheme of the present invention is used has following operation: the formation operation of molding; In this operation with iron-bearing material, carbon raw material and tackiness agent mix, mixing, mixing thing be shaped and obtain molding; With then above-mentioned molding is carried out maintenance obtains non-operation of burning till the carbon containing lump ore, wherein, with above-mentioned non-carbon content (T.C) of burning till the carbon containing lump ore be 18～25 quality % and gangue content CaO content (quality %) and SiO
2The ratio CaO/SiO of content (quality %)
2Reach 1.0～2.0 mode, in the formation operation of above-mentioned molding, regulate more than one the matching requirements be selected from ore kind and the tackiness agent use level.
For the non-method of manufacture of burning till the carbon containing lump ore that the blast furnace of a scheme of the present invention is used, can be with above-mentioned non-burn till the carbon containing lump ore by CaO content (quality %), SiO
2Content (quality %), Al
2O
3Gangue the amount ((CaO+SiO of content (quality %), MgO content (quality %) and carbon content (T.C) (quality %) expression
2+ Al
2O
3+ MgO)/(100-carbon content (T.C))) value be below 0.25 and MgO content reaches the above mode of 0.5 quality %, in the formation operation of above-mentioned molding, regulate above-mentioned matching requirements.
Can above-mentioned tackiness agent use level be adjusted in the scope of 5～10 quality %.
In the formation operation of above-mentioned molding, also further matching pair raw material and contain high SiO
2Among the ore any one or both; Above-mentioned auxiliary material is selected from silica, serpentine, peridotites, rhombspar, nickel slag (nickel slag), magnesite, brucite; Wherein, be 18～25 quality % and CaO content and SiO with above-mentioned non-carbon content (T.C) of burning till the carbon containing lump ore
2The ratio CaO/SiO of content
21.0～2.0 the mode of reaching is regulated above-mentioned auxiliary material and is contained high SiO
2The use level of ore.
The effect of invention
The blast furnace of a scheme of the present invention is used, and the non-carbon containing lump ore that burns till has and is enough to improve non-carbon content of burning till main blast furnace such as carbon containing lump ore and agglomerate with the rate that is reduced of iron-bearing material.In addition, in the operation of blast furnace, and compared in the past, and can suppress the slag fusing point lower, thereby can realize that good reduction generates slag characteristic (metal drippage property).
Therefore, when a scheme of the present invention non-being burnt till the carbon containing lump ore and use with the part of iron-bearing material as blast furnace, excellent air permeability can be realized in the stove bottom when blast furnace operating.In addition, can significantly reduce reducing material than (coke ratio).
The non-method of manufacture of burning till the carbon containing lump ore that the blast furnace of a scheme of the present invention is used has adopted non-firing process, therefore compares with firing process, can realize energy-conservationization, low CO
2Change.In addition, through less expensive and easy method, can the dust that produce in the ironmaking process be utilized processing again as iron-bearing material and carbon material.
Description of drawings
Fig. 1 is expression tackiness agent (cement) use level (and CaO/SiO
2Ratio) with the figure of the relation of cold ultimate compression strength.
Fig. 2 is that expression MgO content is 1.5% o'clock agglomerate and the non-CaO/SiO that burns till the carbon containing lump ore
2Figure with the relation of slag fusing point.
Fig. 3 is expression CaO/SiO
2Be the figure of the relation of 1.5 o'clock agglomerate and the non-MgO content and the slag fusing point that burn till the carbon containing lump ore.
Fig. 4 is the non-CaO/SiO that burns till carbon containing lump ore and agglomerate of expression
2Figure with the relation of metal drippage rate.
Fig. 5 is the figure of the relation of non-MgO content that burns till carbon containing lump ore and agglomerate of expression and metal drippage rate.
Fig. 6 is expression gangue amount (CaO+SiO
2+ MgO+Al
2O
3The figure of the relation of the value of)/(100-TC) and metal drippage rate.
Fig. 7 is the non-figure that burns till carbon content (T.C) with the relation of metal drippage rate of carbon containing lump ore of expression.
Fig. 8 representes that in the past agglomerate and high-carbon content non-burns till the figure of relation of temperature and the reduction ratio of carbon containing lump ore.
Fig. 9 representes that in the past agglomerate and high-carbon content non-burns till the figure of relation of calculated value of temperature and the slag fusing point of carbon containing lump ore.
Embodiment
The non-carbon containing lump ore that burns till that the blast furnace of this embodiment is used is made through following method: with iron-bearing material, carbon raw material and tackiness agent mix, mixing, mixing thing be shaped and obtain molding, then above-mentioned molding is carried out maintenance.Carbon content (T.C) is 18～25 quality %, the CaO/SiO of gangue content
2Be 1.0～2.0.Thus, obtain optimum slag fusing point concerning being used for blast furnace.
In this embodiment, non-carbon content (T.C) of burning till the carbon containing lump ore is 18～25 quality %, is preferably 20～23 quality %.
Carbon content is lower than at 18% o'clock, even regulate gangue content, the effect that reduces the reducing material ratio also diminishes.When carbon content surpasses 25 quality %, can't have the cold ultimate compression strength that is used for the needed minimum of blast furnace.
Non-CaO content (quality %) and the SiO that burns till the gangue content of carbon containing lump ore
2The ratio CaO/SiO of content (quality %)
2(being also referred to as basicity) is 1.0～2.0, is preferably 1.4～1.7.
Through making CaO/SiO
2Be the low value in 1.0～2.0 scopes, can improve metal drippage rate.At CaO/SiO
2Under 2.0 the situation of surpassing, metal drippage rate is lower than 50%.At CaO/SiO
2Be lower than under 1.0 the situation, the effect that metal drippage rate improves is saturated.
In this embodiment, the value of gangue amount is preferably below 0.25, and more preferably 0.22～0.25.Wherein, the gangue amount is the value that goes out through computes.
Gangue amount=(CaO+SiO
2+ Al
2O
3+ MgO)/(100-carbon content (T.C))
Need to prove the CaO in the formula, SiO
2, Al
2O
3And MgO representes non-CaO content (quality %), the SiO that burns till in the carbon containing lump ore respectively
2Content (quality %), Al
2O
3Content (quality %) and MgO content (quality %).
Through the value that makes the gangue amount is below 0.25, and the slag amount is reduced, and further improves drippage property.
MgO content is preferably more than the 0.5 quality %, more preferably 0.6～2.0 quality %.Thus, the fusing point of low FeO slag (the poor slag of FeO) can further improve metal drippage property owing to MgO reduces.
The non-method of manufacture of burning till the carbon containing lump ore that the blast furnace of this embodiment is used has following operation: the formation operation of molding, in this operation with iron-bearing material, carbon raw material and tackiness agent mix, mixing, mixing thing be shaped and obtain molding; With then above-mentioned molding is carried out maintenance obtains non-operation of burning till the carbon containing lump ore.In the formation operation of molding, reach the CaO content (quality %) and the SiO of 18～25 quality % and gangue content with non-carbon content (T.C) of burning till the carbon containing lump ore
2The ratio CaO/SiO of content (quality %)
2Reach 1.0～2.0 mode, regulate more than one the matching requirements be selected from ore kind and the tackiness agent use level.
As the iron-bearing material that uses in this embodiment, can enumerate: iron dust containings such as the sintering dust that produces in the ironmaking process, blast furnace dust, pellet feed that size ratio sintering powdered iron ore is little, sintering powdered iron ore is carried out micro mist shape iron ore that broken and/or whole grain makes etc.
According to the ore kind of using, iron and SiO
2Content Deng gangue content is different greatly.Therefore, through the ore kind of selecting to use, can regulate CaO/SiO
2Value.CaO/SiO particularly
2Value receives SiO
2The very big influence of use level of the ore that content is many.
As the ore kind of using in this embodiment, can enumerate out: India high silicon ore deposit (イ Application De Ha イ シ リ シ ヤ ス), sieve Bai He ore deposit (Robe River), Yang Dikujina ore deposit (Yandicoogina), Itabira ore deposit, fresh water river valley (Rio Doce (Itabira)), horse traction mamba ore deposit (Marra Mamba) etc.
As the carbon raw material that uses in this embodiment, can enumerate out: blast furnace is ash, coke dust, micro mist coke, smokeless carbon etc. once.
As the tackiness agent that uses in this embodiment, can enumerate out: with the broken slag of normally used blast furnace water as the micro mist of principal constituent and the ageing tackiness agent that constitutes by the alkali stimulant, unslaked lime, portland cement, wilkinite etc.The use level of tackiness agent (addition) can consider that other matching requirementss wait suitably definite.When the use level of tackiness agent is very few, be difficult to keep fully non-cold rolling intensity of burning till the carbon containing lump ore.In addition, when the use level of tackiness agent was too much, non-slag amount of burning till the carbon containing lump ore increased, and it is unstable that the air permeability of stove bottom becomes.Thus, can't obtain stable reducing material than reducing effect.
So, make CaO/SiO to regulating the tackiness agent use level
2The non-cold strength of burning till the carbon containing lump ore that changes is investigated.Resulting result is shown in table 1 and Fig. 1.
Table 1
Reduce (CaO/SiO in tackiness agent (cement) use level
2Reduce) time, cold strength reduces.So, at CaO/SiO
2Be lower than under the situation of 1.0 (tackiness agent (cement) use level is lower than 5 quality %), be difficult to keep cold ultimate compression strength 100kg/cm
2Non-cold ultimate compression strength of burning till the carbon containing lump ore is lower than 100kg/cm
2The time, in blast furnace, transporting, causing when packing into non-efflorescence of burning till the carbon containing lump ore sometimes.In order to make cold ultimate compression strength be maintained to 100kg/cm
2More than, preferably making tackiness agent (cement) use level is more than the 5 quality %.In addition, when tackiness agent (cement) use level surpasses 10 quality %, cause the increase of gangue amount sometimes.Therefore, preferably making tackiness agent (cement) use level is below the 10 quality %.Thus, the use level of tackiness agent is preferably 5～10 quality %.
Need to prove, mix, in the manufacturing process of mixing, shaping and maintenance, the hydration reaction through cement in the maintenance gets in the hydrate in the carbon containing lump ore free water content.Therefore, during through manufacturing process, some variations take place in total use level of raw material, but its variable quantity is small, can think not change basically.Therefore, for example the use level of tackiness agent is substantially the same with the non-binder content that burns till in the carbon containing lump ore of manufacturing.For other compositions too, the use level in the manufacturing process is substantially the same with the non-content that burns till in the carbon containing lump ore.
Therefore, the non-of this embodiment burns till in the carbon containing lump ore, and the content of tackiness agent is preferably 5～10 quality %, can realize 100kg/cm as stated thus
2Above cold ultimate compression strength.
In this embodiment, preferred further matching pair raw material and contain high SiO
2Ore.Thus, can carry out composition regulates tightlyer.Particularly can under the situation that not influenced by amount of binder, regulate CaO/SiO
2Value.
As auxiliary material, can enumerate out: with SiO
2As the silica of principal constituent, with MgO as the serpentinite of principal constituent, peridotites, rhombspar, nickel slag (nickel slag), magnesite, brucite etc.In addition, contain high SiO
2Ore is SiO
2Content is the above ores of 3.5 quality %.
As a rule, when the chemical ingredients of burning till the carbon containing lump ore as target non-during by regulation, these auxiliary materials with contain high SiO
2The use level of ore has just automatically been confirmed.Therefore, these auxiliary materials with contain high SiO
2The use level of ore does not have special qualification, comes suitably to confirm according to non-chemical ingredients of burning till the carbon containing lump ore.
Then, to regulating CaO/SiO
2, MgO content and gangue amount method be explained in more detail.
CaO/SiO
2According to the CaO amount and the SiO that contain in the raw material that is cooperated
2Amount is confirmed.
The blast furnace that CaO mainly is included in tackiness agent, use as carbon raw material once in ash, the sintering class dust that uses as iron-bearing material and the converter class dust etc., is suitably regulated through the use level to them, can regulate CaO content.But, using under the high situation of cement class tackiness agent of CaO composition, because with CaO/SiO as tackiness agent
21.0～2.0 the mode of reaching is regulated CaO content, and the use level self of tackiness agent is reduced.Thereby, need to consider whether to obtain sufficient cold ultimate compression strength.
SiO
2, MgO mainly is included in tackiness agent, the blast furnace that uses as carbon raw material is during once ash, the sintering class dust that uses as iron-bearing material, the ash in the carbon class waste grade.
In this embodiment, if the non-CaO/SiO that burns till in the carbon containing lump ore
2Be 1.0～2.0, no matter SiO then
2The interpolation form (contain SiO
2The form of raw material) how, can both bring the constant effect.In addition, about MgO,,, can both bring the constant effect no matter then the interpolation form of MgO (form that contains the raw material of MgO) how if MgO content is more than the 0.5 quality %.
Reducing CaO/SiO energetically
2Value or to make MgO content be under the above situation of 0.5 quality %, preferably cooperate auxiliary material such as silica, serpentinite, peridotites, rhombspar, nickel slag (nickel slag), magnesite, brucite or contain high SiO
2Ore.Thus, as stated, can under the situation that not influenced by amount of binder, regulate CaO/SiO
2Value and MgO content.But, cooperate these auxiliary materials and contain high SiO a large amount of
2During ore, the gangue amount increases.Therefore, the mode that preferably reaches below 0.25 with the gangue amount is regulated CaO/SiO
2, MgO.
In this embodiment, as stated, carbon content (T.C), CaO/SiO have been stipulated
2, gangue amount and MgO content numerical range.The experimental result of the critical meaning of representing these numerical ranges is illustrated following.
To CaO/SiO
2Be 1.5 and MgO content be that the reduction ratio that 1.5% agglomerate and non-burns till under 1400 ℃ of carbon containing lump ore is measured.In addition, suppose that unreduced iron all is present in the slag with the form of FeO, calculates the FeO concentration in the slag by resulting reduction ratio.The result can know, the FeO concentration in the slag is 34% under the situation of using agglomerate, is 2% using under the non-situation of burning till the carbon containing lump ore.Use this FeO concentration, investigate CaO/SiO to agglomerate and the non-carbon containing lump ore that burns till
2Value or the relation of MgO content and slag fusing point.Need to prove slag fusing point (CaO-SiO
2-Al
2O
3-the simulation MgO-FeO) undertaken by computingmachine is obtained.
Fig. 2 representes that MgO content is 1.5% o'clock CaO/SiO
2Relation with the slag fusing point.Fig. 3 representes CaO/SiO
2It is the relation of 1.5 o'clock MgO content and slag fusing point.
Know by shown in Figure 2, for agglomerate and non-carbon containing lump ore, the CaO/SiO of burning till
2The effect that the slag fusing point is produced is different.This is because the difference of the reduction ratio (being the FeO concentration in the slag) under the high temperature causes.Particularly, for agglomerate, CaO/SiO
2Reduced by 1.0 o'clock, the slag fusing point reduces by 278 ℃.Relative therewith, for non-carbon containing lump ore, the CaO/SiO of burning till
2Reduced by 1.0 o'clock, the slag fusing point reduces by 620 ℃.Therefore, the non-CaO/SiO that burns till in the carbon containing lump ore
2Influence than the CaO/SiO in the agglomerate
2Influence big more than 2 times.
The non-carbon containing lump ore reduction ratio height at low temperatures that burns till.Comparing under the situation of using many non-of carbon content to burn till the carbon containing lump ore, earlier be reduced on the top of blast furnace with the few lump ore that burns till of carbon content.Like this, reduce in top reduction and the amount (amount of FeO) that moves to unreduced iron residual in the slag of bottom.When the amount of the FeO in the slag reduced, the slag fusing point rose.As stated, the fusing point of slag receives basicity (CaO/SiO
2) influence.Therefore can think that according to non-basicity of burning till in the carbon containing lump ore, the slag fusing point can significantly change.Can think that in addition non-ly burn till basicity in the carbon containing lump ore when big, it is very high that the slag fusing point becomes.
In addition, can know that for agglomerate, if MgO content increases by 1.0%, then the slag fusing point reduces by 50 ℃ with reference to Fig. 3.Relative therewith, burn till the carbon containing lump ore for non-, if MgO content increases by 1.0%, then the slag fusing point reduces by 22 ℃.Therefore, the influence of the MgO content in non-influence of burning till the MgO content in the carbon containing lump ore and the agglomerate compare be about half the.
But strictly speaking, the drippage behavior can not be only confirmed by the slag fusing point, also receives slag amount and other slag rerum naturas (viscosity and with the wellability of metal etc.) influence.Therefore, the drippage behavior is a complex phenomena, and is not clear and definite fully as yet at present.But be known that for agglomerate and the non-carbon containing lump ore that burns till, the slag fusing point reduced promote that the member condition of metal drippage is different.
So, use the loading softening testing apparatus, the non-drippage characteristic of burning till the carbon containing lump ore with various gangue contents is investigated.
Iron-bearing material and carbon raw material are pulverized, be mixed together with tackiness agent, auxiliary material, mixing, thus obtain mixing thing.Then, mixing thing is shaped, molding is carried out the maintenance of scheduled period, thereby make the non-carbon containing lump ore that burns till.The non-carbon content T.C (total carbon) that burns till the carbon containing lump ore is 20 quality %.In addition, with CaO/SiO
2Reach the fit rate that the mode of the value of regulation is regulated iron-bearing material and auxiliary material with MgO content.The use level of tackiness agent (cement) is 10 quality %.
Particularly, so that gangue amount ((CaO+SiO
2+ Al
2O
3+ MgO)/(100-carbon content (T.C))) be 0.22 and keep constant, make MgO content being 0.9 quality % and keeping constant, CaO/SiO
2Reach prescribed value and be the mode in 0.5～2.5 the scope, the use level of regulating portland cement and micro mist silica.Thus, make the CaO/SiO of gangue content
2In 0.5～2.5 scope and the different separately non-carbon containing lump ores that burns till.
In addition, manufacturing makes CaO/SiO
2Be 2.0 and keep constant and have the non-carbon containing lump ore that burns till of various MgO content.
At first, for the CaO/SiO of gangue content
2In 0.5～2.5 scope and the different separately non-carbon containing lump ore that burns till implement the loading softening test.
Suppose that actual blast furnace uses, with the non-carbon containing lump ore that burns till with respect to common agglomerate (CaO/SiO
2=1.8) mix with 10% ratio.Carry out the reductive stage being heated to 1600 ℃, measure from the amount of metal (rate) of crucible drippage.In addition, calculate the metal drop-off rate (%) that defines by following formula.
Metal drippage rate (%)=drippage amount of metal/(total Fe amount * 0.95 of packing into) * 100
In addition, the situation that is merely agglomerate is likewise measured metal drippage rate.Need to prove that the metal drippage rate of agglomerate is lower than at 50% o'clock, the cohesive zone lower surface descends, and dropping zone zone, bottom narrows down.Therefore, the bottom air permeability worsens, and it is difficult that stable operation becomes.
Resulting result is shown in table 2, Fig. 4.
Table 2
Know the non-CaO/SiO that burns till the carbon containing lump ore by shown in Figure 4
2High more, metal drippage rate reduces more.Be the non-CaO/SiO that burns till the carbon containing lump ore especially
2Surpass at 2.0 o'clock, be difficult to keep 50% metal drippage rate.Through using the non-carbon containing lump ore that burns till, carry out indirect reduction from low-temperature region, the FeO content in the slag that therefore in thermal adhesive layer, coexists with metal reduces, and the slag fusing point rises.As a rule, the fused solution of the iron that generates through reduction has comprised the carbon of coke when dropping to bottom house, and carbon content increases (reduction generates metallized carbon).Rise through the slag fusing point, the cohesion between the fused solution of the iron behind the reduction generation metallized carbon is hindered, and obtains result as shown in Figure 4.CaO/SiO
2Be lower than at 1.0 o'clock, although coexistence slag fusing point is enough low, slag drippage rate is lower than 50%.This be because, as the SiO of network organizer
2Ratio increase, thereby the viscosity of coexistence slag rises, and hinders the cohesion of metal.
In addition, among Fig. 4, also show expression MgO content and be the CaO/SiO of 1.5% agglomerate
2Mensuration result with the relation of metal drippage rate.For agglomerate, also observe along with CaO/SiO
2Rising and metal drippage rate takes place reduces tendency.But it changes slowly.Result by Fig. 4 also can confirm, for non-carbon containing lump ore and the agglomerate of burning till, is used to the member condition difference that realizes that good metal drippage property institute should possess.
As stated, for improving metal drippage rate, need make CaO/SiO
2Be 1.0～2.0.CaO/SiO
2Be preferably 1.4～1.7, can realize surpassing 60% metal drippage rate.
In addition, for CaO/SiO
2Be 2.0 and have the non-carbon containing lump ore that burns till of various MgO content, implement the loading softening test through same method.In addition, to non-carbon containing lump ore non-MgO content and the relation of metal drippage rate of burning till in the carbon containing lump ore so that 10% mixed is in agglomerate of burning till investigated.Resulting result is shown in table 3, Fig. 5.
Table 3
Know that by shown in Figure 5 in order to improve metal drippage rate, it also is effective that the non-MgO content that burns till in the carbon containing lump ore is risen.By with CaO/SiO
2Be that 2.0 non-variation of burning till carbon containing lump ore metal drippage rate so that 10% mixed is in agglomerate can be known, MgO content reaches 0.5 quality % when above, and metal drippage rate can keep 50%.MgO content is high more, and metal drippage rate rises.But MgO content begins near 2.0%, and effect is saturated.This is because the fusing point of above-mentioned low FeO slag (the poor slag of FeO) is owing to MgO reduces, therefore at CaO/SiO
2Under the high more condition, can obtain the effect of bringing by MgO effectively.
Therefore, MgO content is preferably more than the 0.5 quality %.The upper limit is not set especially.
In addition, also show expression CaO/SiO among Fig. 5
2Be the mensuration result of relation of MgO containing ratio and the metal drippage rate (%) of 2.0 agglomerate.For agglomerate, also observe the tendency that the rising of metal drippage rate takes place along with the rising of MgO content.But this variation (influence) is compared bigger with the non-carbon containing lump ore that burns till.Result by Fig. 5 also can confirm, for non-carbon containing lump ore and the agglomerate of burning till, is used to the member condition difference that realizes that good metal drippage property institute should possess.
In addition, the slag amount of coexistence (gangue amount+unreduced FeO amount) also is the important factor of decision drippage property.So, make CaO/SiO
2Be 1.5, MgO is 1.0%, the gangue amount the is different non-carbon containing lump ore that burns till.Measure its metal drippage rate, investigate the drippage characteristic.
As stated, the gangue amount is come out through computes.
Gangue amount=(CaO+SiO
2+ Al
2O
3+ MgO)/(100-carbon content (T.C))
Resulting result is shown in table 4, Fig. 6.
Table 4
As stated, the FeO concentration in the slag has been reduced to 2% at the comparison low-temp. portion, so the influence of FeO concentration is little.Consequently, be 0.25 when following, in the gangue amount no matter the slag amount how, all demonstrates good metal drippage property.Can think, during in the scope below 0.25, compare, solid rate, viscosity, become the governing factor of metal drippage property with the slag rerum naturas such as wellability of metal with the slag amount in the gangue amount.But, surpass at 0.25 o'clock in the gangue amount, can not ignore the influence of slag amount, drippage property variation.And then, if adopt the gangue amount of this level (surpass 0.25), use non-ly when burning till the carbon containing lump ore then in a large number in blast furnace, cause siege slag amount to enlarge markedly, the operation instability of slagging tap becomes the reason of ventilation change.
Can know by above result, preferably with gangue amount ((CaO+SiO
2+ MgO+Al
2O
3)/(100-TC)) be that mode below 0.25 is regulated the non-composition that burns till the carbon containing lump ore.
And then, for non-carbon content (T.C) of burning till in the carbon containing lump ore influence that metal drippage rate produces is investigated.
With MgO is 1.0 quality % and to keep constant, gangue amount be 0.22 and keep constant, CaO/SiO
2The mode that reach 0.5,1.0,1.5,2.0 or 2.5, carbon content (T.C) reaches 10,15,18,25 or 30 quality % is regulated the proportioning of raw material, thereby is made the non-carbon containing lump ore that burns till.
Likewise measure metal drainage (rate) with aforesaid method.Resulting result is shown in Fig. 7.
Table 5
Result by Fig. 7 can know that along with the increase of carbon content (T.C), the metal drop-off rate reduces.This is because as stated, along with the increase of carbon content (T.C), reduce with FeO concentration in the slag of metal coexistence.
As stated, in order to realize the stable operation in the blast furnace, metal drippage rate need be for more than 50%.Can know CaO/SiO
2Be 1.0～2.0, carbon content (T.C) is 25 quality % when following, can realize the metal drippage rate more than 50%.Therefore, need make the higher limit of carbon content (T.C) is 25 quality %.
Need to prove, in this embodiment, burn till the composition of carbon containing lump ore and the use level of gangue is adjusted in the predetermined scope non-, but non-manufacturing process, shape, not restriction of physical structure (pore/voidage etc.) of burning till the carbon containing lump ore.If the non-carbon containing lump ore that burns till for blast furnace is used then can adopt various forms such as particle or agglomerate.In addition, also can adopt various manufacturing process such as extrusion molding, can access equal effect.
In blast furnace, the thing of packing into moves to the bottom from top, and reducing gas moves to top from the bottom, carries out heat exchange and reaction thus.Therefore, blast furnace is to flow reactor.Usually in the operate continuously of blast furnace, on the upper strata of ore layer, the reducing power of reducing gas loses sometimes, thereby reduction is not carried out fully.Particularly burn till lump ore and do not contain carbon, do not have self reducing power.Therefore, burn till in use under the situation of lump ore, burn till lump ore and do not reduced fully on the top of ore layer.So, under the incomplete state of reduction, burn till lump ore when bottom house moves, be reduced in the dropping zone and the combustion chamber portion of blast furnace, cause direct reduction.Under these circumstances, exist load to blast furnace to increase and the problem of air permeability variation.
Relative therewith, non-when burning till the carbon containing lump ore what use this embodiment, this embodiment non-burns till the carbon containing lump ore and iron ore exists simultaneously in blast furnace, and the reduction efficiency in the upper strata of ore layer is particularly significantly improved.
But, for the high non-carbon containing lump ore that burns till of carbon content, as stated, particularly by basicity (CaO/SiO
2) influence big (Fig. 2) to the slag fusing point that produces.In this embodiment, based on foregoing invention people's etc. result of study, through regulation carbon content (T.C) and CaO/SiO
2, realized good metal drippage property.Therefore, the slag hold-up of dropping zone and combustion chamber portion reduces, and can guarantee excellent air permeability.
And then as stated, this embodiment non-burns till the carbon containing lump ore and iron ore exists simultaneously in blast furnace, can significantly improve the reduction efficiency in the upper strata of ore layer particularly thus.Because the reduction efficiency in the upper strata that is difficult to carry out the reductive ore layer is significantly improved, therefore the reduction efficiency in the whole blast furnace significantly improves.Thereby, can reduce than burning till the reducing material of the more amount of amount of coke of the remainder equivalent of the carbon amount in the carbon containing lump ore with this embodiment non-.
Embodiment
As iron-bearing material, prepare micro mist shape iron-bearing material (sintering dust and iron ore), as carbon raw material, prepare carbon material (coke dust, coke breeze charcoal and blast furnace be ash once).In addition, as tackiness agent, prepare cement (early strong portland cement).Need to prove, in several embodiment, also used SiO
2The auxiliary material that content is high.
With the cooperation ratio of cement (early strong portland cement) is the mode that the cooperation ratio of 4～9 quality %, carbon material and micro mist shape iron-bearing material reaches various values, the use level of regulating raw material.These raw materials and moisture are mixed together, carry out mixing with the Emhorn mixing machine.Resulting mixing thing is carried out granulation (shaping) and obtains untreated particle with granulating disc.Then, with untreated particle 2 weeks of maintenance in the sun, thereby make the non-carbon containing lump ore that burns till.Need to prove that untreated particulate moisture is adjusted to 10～14 quality % according to the cement amount that cooperates.
For the resulting non-carbon containing lump ore that burns till,, measure cold ultimate compression strength through following method based on JISM8718.To 1 sample, apply compressive load with the pressing speed of stipulating, the loading value when measuring sample destruction.Obtain the loading value (kg/cm of per unit sectional area
2).Then, calculate the MV of 100 samples, it is used as intensity index.
Through aforesaid method, measure non-slag fusing point and metal drippage rate of burning till the carbon containing lump ore.
In addition, be 5500m in useful volume
3Blast furnace in, the non-carbon containing lump ore that burns till of amount that uses 50kg/tp carries out the operation of blast furnace as part of raw materials.And then the top K value in the operation of mensuration blast furnace, bottom K value, blast change and the reducing material ratio, obtain the MV of about 1 month operating result.The result is shown in table 6.
Can know with reference to table 6, in embodiment 1, implement suitableization of composition, make CaO/SiO
2Be 2.0, MgO is 0.6%, the gangue amount is 0.22.When in blast furnace, using, the air permeability of stove bottom improves, and the reducing material ratio is reduced to 470kg/tp.Therefore, brought into play the high non-effect of burning till the carbon containing lump ore of use carbon content.
In addition, in embodiment 2, cooperate SiO
2The auxiliary material that content is high improves SiO
2Content makes CaO/SiO
2Further be reduced to 1.0.Among this embodiment 2, because CaO/SiO
2With MgO content in proper range, therefore reduced the slag fusing point.But, be 0.28 because the gangue amount increases, so metal drippage property reduce slightly, reducing material is than reducing very much.
In embodiment 3,, make amount of binder be reduced to 4% in order to reduce the gangue amount.But because the content of chemical ingredients is suitable, so metal drippage rate improves.But because amount of binder is few, therefore cold ultimate compression strength becomes insufficient, is 85kg/cm
2Thereby under the situation about in blast furnace, using, the powder amount in the stove increases, top air permeability variation thus, and reducing material is than being in a high position slightly.
Among the embodiment 4, come the matching pair raw material, carry out the adjusting of the content of chemical ingredients through amount of binder is reduced.Its result under the situation of not damaging cold ultimate compression strength, can make the good non-carbon containing lump ore that burns till of metal drippage property.Under the situation about in blast furnace, using, reducing material is more maximum than reducing.
Among the embodiment 5, CaO/SiO
2And the scope (CaO/SiO that in this embodiment, stipulates of gangue amount
2: 1.0～2.0, gangue amount: below 0.25), but MgO content is set lowlyer, is 0.4%.Therefore, the metal drop-off rate stops to 52%, though the reducing material ratio reduces, its reducing material is smaller than the effect that reduces.
Relative therewith, in the comparative example 1, made carbon content (T.C) and be low to moderate 17 quality %, CaO/SiO
2Be low to moderate 1.9, MgO content is up to 1.0% the non-carbon containing lump ore that burns till.When carbon content (T.C) was hanged down, the slag fusing point was enough low, and drippage property is not had problems.But, under the situation about in blast furnace, using,, therefore be difficult to reduce the reducing material ratio because carbon content is low.
In the comparative example 2, made carbon content (T.C) has been increased to 20% and with CaO/SiO
2Increase the non-carbon containing lump ore that burns till to 2.2.Because reduction ratio at low temperatures improves, so the slag fusing point significantly rises.And then, because CaO/SiO
2Surpass 2.0, so the reduction of metal drippage property.But under the situation about in blast furnace, using, in the air permeability variation of stove bottom, the change of blast significantly increases.Thus, operation becomes unstable.Therefore, can't enjoy to the full by the high effect of being brought of carbon content, the reducing material ratio rests on the 500kg/tp level.
In the comparative example 3, to have made carbon content be 30%, surpass the high-carbon non-carbon containing lump ore that burns till of the upper limit 25 quality % of the scope of stipulating in this embodiment.Because the content of other compositions is in suitable scope, so drop-off rate is increased to 65%.But cold strength is low to moderate 60kg/cm
2, do not obtain in blast furnace using the intensity of needed minimum.Therefore, the Intake Quantity of the powder in blast furnace increases, and it is difficult that secular stable operation becomes.
Can know as stated, burn till the carbon containing lump ore, be 18～25 quality %, make CaO/SiO through making carbon content (T.C) concerning non-
2In 1.0～2.0 scope, metal drippage property is good, and can be reduced in the reducing material ratio when using in the blast furnace.Particularly at gangue amount (CaO+SiO
2+ Al
2O
3+ MgO)/(100-carbon content (T.C)) value is below 0.25 and MgO content is that this effect is remarkable under the above situation of 0.5 quality %.In addition, carry out such composition through the interpolation of auxiliary material and regulate, making the tackiness agent use level is 5～10%, also can keep cold ultimate compression strength thus.
The possibility of utilizing on the industry
The blast furnace of a scheme of the present invention is used, and the non-carbon containing lump ore that burns till has and is enough to improve non-carbon content of burning till main blast furnace such as carbon containing lump ore and agglomerate with the rate that is reduced of iron-bearing material when in blast furnace, using.And then, in the operation of blast furnace, and compared in the past, can suppress the slag fusing point lower, thereby can realize that good reduction generates slag characteristic (metal drippage property).
Therefore, as blast furnace during with iron-bearing material a part of, excellent air permeability can be realized in the stove bottom when blast furnace operating, can significantly reduce reducing material than (coke ratio) at the non-carbon containing lump ore that burns till that uses a scheme of the present invention.
The non-method of manufacture of burning till the carbon containing lump ore that the blast furnace of a scheme of the present invention is used has adopted non-firing process, therefore compares with firing process, can realize energy-conservationization, low CO
2Change.In addition, through less expensive and easy method, can the dust that produce in the ironmaking process be utilized processing again as iron-bearing material and carbon material.
Therefore, in the technical field of a scheme of the present invention carbon containing lump ore that can be applied to aptly in blast furnace, to use.
Claims (7)
1. non-carbon containing lump ore that burns till that blast furnace is used; It is characterized in that it is made through following method: with iron-bearing material, carbon raw material and tackiness agent mix, mixing, mixing thing be shaped and obtain molding; Then said molding is carried out maintenance
Wherein, carbon content (T.C) is 18～25 quality %, and the CaO content (quality %) and the SiO of gangue content
2The ratio CaO/SiO of content (quality %)
2Be 1.0～2.0.
2. the non-carbon containing lump ore that burns till that blast furnace according to claim 1 is used, wherein, by CaO content (quality %), SiO
2Content (quality %), Al
2O
3Gangue the amount ((CaO+SiO of content (quality %), MgO content (quality %) and carbon content (T.C) (quality %) expression
2+ Al
2O
3+ MgO)/(100-carbon content (T.C))) value be below 0.25, and MgO content is more than the 0.5 quality %.
3. the non-carbon containing lump ore that burns till that blast furnace according to claim 1 is used, wherein, the content of said tackiness agent is 5～10 quality %.
4. non-method of manufacture of burning till the carbon containing lump ore that blast furnace is used is characterized in that having following operation:
The formation operation of molding, in this operation with iron-bearing material, carbon raw material and tackiness agent mix, mixing, mixing thing be shaped and obtain molding; With
Then said molding is carried out maintenance obtains non-operation of burning till the carbon containing lump ore,
Wherein, the CaO content (quality %) and the SiO that are 18～25 quality % and gangue content with said non-carbon content (T.C) of burning till the carbon containing lump ore
2The ratio CaO/SiO of content (quality %)
2Reach 1.0～2.0 mode, in the formation operation of said molding, regulate more than one the matching requirements be selected from ore kind and the tackiness agent use level.
5. the non-method of manufacture of burning till the carbon containing lump ore that blast furnace according to claim 4 is used, wherein, with said non-burn till the carbon containing lump ore by CaO content (quality %), SiO
2Content (quality %), Al
2O
3Gangue the amount ((CaO+SiO of content (quality %), MgO content (quality %) and carbon content (T.C) (quality %) expression
2+ Al
2O
3+ MgO)/(100-carbon content (T.C))) value be below 0.25 and MgO content reaches the above mode of 0.5 quality %, in the formation operation of said molding, regulate said matching requirements.
6. the non-method of manufacture of burning till the carbon containing lump ore that blast furnace according to claim 4 is used wherein, is adjusted in said tackiness agent use level in the scope of 5～10 quality %.
7. the non-method of manufacture of burning till the carbon containing lump ore that blast furnace according to claim 4 is used, wherein, in the formation operation of said molding, further matching pair raw material and contain high SiO
2Among the ore any one or both, said auxiliary material is selected from silica, serpentine, peridotites, rhombspar, nickel slag, magnesite, brucite,
Wherein, be 18～25 quality % and CaO content and SiO with said non-carbon content (T.C) of burning till the carbon containing lump ore
2The ratio CaO/SiO of content
21.0～2.0 the mode of reaching is regulated said auxiliary material and is contained high SiO
2The use level of ore.
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| JP2009191966 | 2009-08-21 | ||
| JP2009-191966 | 2009-08-21 | ||
| PCT/JP2010/063726 WO2011021577A1 (en) | 2009-08-21 | 2010-08-12 | Unfired carbon-containing agglomerate for blast furnaces and production method therefor |
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| CN102482730B CN102482730B (en) | 2014-07-02 |
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| JP (1) | JP4808819B2 (en) |
| KR (1) | KR101475125B1 (en) |
| CN (1) | CN102482730B (en) |
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| JP2016077965A (en) * | 2014-10-16 | 2016-05-16 | 新日鐵住金株式会社 | Fly ash recycle method and non-fired agglomerated ore |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP6132114B2 (en) * | 2013-07-11 | 2017-05-24 | Ｊｆｅスチール株式会社 | Method for producing granulated raw material for sintering |
| JP6273983B2 (en) * | 2014-04-04 | 2018-02-07 | 新日鐵住金株式会社 | Blast furnace operation method using reduced iron |
| KR20160071032A (en) | 2014-12-11 | 2016-06-21 | 주식회사 포스코 | Briquettes and Method for Manufacturing Briquettes |
| CN104651602B (en) * | 2015-01-12 | 2017-01-25 | 内蒙古包钢钢联股份有限公司 | Method for preparing sinter ore by using high-silicon fine ore |
| CN108913181A (en) * | 2018-07-19 | 2018-11-30 | 武钢集团昆明钢铁股份有限公司 | A kind of high calcium is burnt and its production method |
| RU2735413C1 (en) * | 2020-05-19 | 2020-11-02 | Михаил Николаевич Бушков | Reinforcing additive for production of iron-ore agglomerate |
| WO2023199550A1 (en) * | 2022-04-11 | 2023-10-19 | Ｊｆｅスチール株式会社 | Operation method for blast furnace |
| CN115404338A (en) * | 2022-09-13 | 2022-11-29 | 石横特钢集团有限公司 | Sintering method of high-silicon high-aluminum iron-containing material |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6029471B2 (en) * | 1979-08-16 | 1985-07-10 | 日機装株式会社 | How to freeze liver cells |
| JPH0629471B2 (en) * | 1985-08-28 | 1994-04-20 | 新日本製鐵株式会社 | Unfired agglomerated ore |
| CN1358870A (en) * | 2001-10-10 | 2002-07-17 | 林原生 | Carbon containing cold consolidated globular ore capable of keeping strength from normal temp. to high temp. |
| CN1468969A (en) * | 2002-05-28 | 2004-01-21 | 株式会社铁原 | Mixed carbon non-sintered block minerals for blast furnace and producing process thereof |
| JP3502064B2 (en) * | 2000-08-30 | 2004-03-02 | 株式会社神戸製鋼所 | Method for producing agglomerates of ironmaking raw materials |
| RU2003119682A (en) * | 2003-07-03 | 2005-01-10 | Открытое акционерное общество "Новолипецкий металлургический комбинат" (ОАО "НЛМК") (RU) | BRIQUETTE - A COMPONENT OF A DOMAIN MIXTURE |
| CN1761762A (en) * | 2003-03-20 | 2006-04-19 | 株式会社神户制钢所 | Process for producing particulate iron metal |
| CN1842604A (en) * | 2003-09-23 | 2006-10-04 | 创陞集团有限公司 | Self-reducing, cold-bonded pellets |
| JP2008095177A (en) * | 2006-09-11 | 2008-04-24 | Nippon Steel Corp | Method for producing carbon-containing non-calcined pellet for blast furnace |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5113301A (en) * | 1974-07-24 | 1976-02-02 | Nippon Steel Corp | HISHOSEIKAISEIKOSEIZOHOHO |
| JPS51147401A (en) * | 1975-06-14 | 1976-12-17 | Nippon Steel Corp | A process for production of non-sintered agglomerated ores |
| JP5114742B2 (en) * | 2007-12-28 | 2013-01-09 | 新日鐵住金株式会社 | Method for producing carbon-containing unfired pellets for blast furnace |
-
2010
- 2010-08-12 CN CN201080036478.XA patent/CN102482730B/en active Active
- 2010-08-12 WO PCT/JP2010/063726 patent/WO2011021577A1/en active Application Filing
- 2010-08-12 BR BR112012003786-2A patent/BR112012003786B1/en active IP Right Grant
- 2010-08-12 IN IN994DEN2012 patent/IN2012DN00994A/en unknown
- 2010-08-12 JP JP2010545717A patent/JP4808819B2/en active Active
- 2010-08-12 KR KR1020127003858A patent/KR101475125B1/en active IP Right Grant
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6029471B2 (en) * | 1979-08-16 | 1985-07-10 | 日機装株式会社 | How to freeze liver cells |
| JPH0629471B2 (en) * | 1985-08-28 | 1994-04-20 | 新日本製鐵株式会社 | Unfired agglomerated ore |
| JP3502064B2 (en) * | 2000-08-30 | 2004-03-02 | 株式会社神戸製鋼所 | Method for producing agglomerates of ironmaking raw materials |
| CN1358870A (en) * | 2001-10-10 | 2002-07-17 | 林原生 | Carbon containing cold consolidated globular ore capable of keeping strength from normal temp. to high temp. |
| CN1468969A (en) * | 2002-05-28 | 2004-01-21 | 株式会社铁原 | Mixed carbon non-sintered block minerals for blast furnace and producing process thereof |
| CN1761762A (en) * | 2003-03-20 | 2006-04-19 | 株式会社神户制钢所 | Process for producing particulate iron metal |
| RU2003119682A (en) * | 2003-07-03 | 2005-01-10 | Открытое акционерное общество "Новолипецкий металлургический комбинат" (ОАО "НЛМК") (RU) | BRIQUETTE - A COMPONENT OF A DOMAIN MIXTURE |
| CN1842604A (en) * | 2003-09-23 | 2006-10-04 | 创陞集团有限公司 | Self-reducing, cold-bonded pellets |
| JP2008095177A (en) * | 2006-09-11 | 2008-04-24 | Nippon Steel Corp | Method for producing carbon-containing non-calcined pellet for blast furnace |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2016077965A (en) * | 2014-10-16 | 2016-05-16 | 新日鐵住金株式会社 | Fly ash recycle method and non-fired agglomerated ore |
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| Publication number | Publication date |
|---|---|
| JP4808819B2 (en) | 2011-11-02 |
| KR101475125B1 (en) | 2014-12-22 |
| CN102482730B (en) | 2014-07-02 |
| IN2012DN00994A (en) | 2015-04-10 |
| BR112012003786B1 (en) | 2021-11-16 |
| BR112012003786A2 (en) | 2016-04-19 |
| JPWO2011021577A1 (en) | 2013-01-24 |
| WO2011021577A1 (en) | 2011-02-24 |
| KR20120042981A (en) | 2012-05-03 |
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