CN103848618A - Synthetic hercynite and production method thereof - Google Patents
Synthetic hercynite and production method thereof Download PDFInfo
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- CN103848618A CN103848618A CN201410018045.1A CN201410018045A CN103848618A CN 103848618 A CN103848618 A CN 103848618A CN 201410018045 A CN201410018045 A CN 201410018045A CN 103848618 A CN103848618 A CN 103848618A
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- aluminium
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 17
- 229910001691 hercynite Inorganic materials 0.000 title abstract description 30
- 230000002194 synthesizing effect Effects 0.000 claims abstract description 23
- 238000005245 sintering Methods 0.000 claims abstract description 19
- 238000002156 mixing Methods 0.000 claims abstract description 16
- 229910052596 spinel Inorganic materials 0.000 claims abstract description 16
- 239000011029 spinel Substances 0.000 claims abstract description 16
- 239000000126 substance Substances 0.000 claims abstract description 15
- 238000005507 spraying Methods 0.000 claims abstract description 9
- 238000000465 moulding Methods 0.000 claims abstract description 7
- 238000007669 thermal treatment Methods 0.000 claims abstract description 7
- 239000003575 carbonaceous material Substances 0.000 claims abstract description 3
- CPLXHLVBOLITMK-UHFFFAOYSA-N Magnesium oxide Chemical compound [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 claims description 54
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 45
- 229910052782 aluminium Inorganic materials 0.000 claims description 30
- 239000000395 magnesium oxide Substances 0.000 claims description 27
- 238000000034 method Methods 0.000 claims description 27
- 239000004411 aluminium Substances 0.000 claims description 26
- 239000000463 material Substances 0.000 claims description 20
- 239000000758 substrate Substances 0.000 claims description 17
- 239000000203 mixture Substances 0.000 claims description 13
- 230000003064 anti-oxidating effect Effects 0.000 claims description 11
- 239000002994 raw material Substances 0.000 claims description 10
- 239000003973 paint Substances 0.000 claims description 9
- GANNOFFDYMSBSZ-UHFFFAOYSA-N [AlH3].[Mg] Chemical compound [AlH3].[Mg] GANNOFFDYMSBSZ-UHFFFAOYSA-N 0.000 claims description 8
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 claims description 6
- 239000007767 bonding agent Substances 0.000 claims description 6
- 238000007689 inspection Methods 0.000 claims description 5
- 239000000843 powder Substances 0.000 claims description 5
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 4
- 206010020843 Hyperthermia Diseases 0.000 claims description 4
- 229910052799 carbon Inorganic materials 0.000 claims description 4
- 230000000694 effects Effects 0.000 claims description 4
- 230000036031 hyperthermia Effects 0.000 claims description 4
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 3
- 239000007787 solid Substances 0.000 claims description 3
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 claims description 2
- 229920001732 Lignosulfonate Polymers 0.000 claims description 2
- 229910004298 SiO 2 Inorganic materials 0.000 claims description 2
- 229910000831 Steel Inorganic materials 0.000 claims description 2
- SNAAJJQQZSMGQD-UHFFFAOYSA-N aluminum magnesium Chemical compound [Mg].[Al] SNAAJJQQZSMGQD-UHFFFAOYSA-N 0.000 claims description 2
- 239000011575 calcium Substances 0.000 claims description 2
- 229910052791 calcium Inorganic materials 0.000 claims description 2
- 239000010439 graphite Substances 0.000 claims description 2
- 229910002804 graphite Inorganic materials 0.000 claims description 2
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 claims description 2
- 239000007788 liquid Substances 0.000 claims description 2
- 238000011068 loading method Methods 0.000 claims description 2
- 238000002844 melting Methods 0.000 claims description 2
- 230000008018 melting Effects 0.000 claims description 2
- 239000011347 resin Substances 0.000 claims description 2
- 229920005989 resin Polymers 0.000 claims description 2
- 238000005096 rolling process Methods 0.000 claims description 2
- 238000005070 sampling Methods 0.000 claims description 2
- 239000007921 spray Substances 0.000 claims description 2
- 239000010959 steel Substances 0.000 claims description 2
- 239000011248 coating agent Substances 0.000 abstract description 11
- 238000000576 coating method Methods 0.000 abstract description 11
- 239000011777 magnesium Substances 0.000 abstract description 8
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 abstract description 6
- 239000013078 crystal Substances 0.000 abstract description 6
- 238000005516 engineering process Methods 0.000 abstract description 5
- 229910052749 magnesium Inorganic materials 0.000 abstract description 5
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 abstract description 4
- 230000002829 reductive effect Effects 0.000 abstract description 3
- 150000002500 ions Chemical class 0.000 abstract description 2
- 239000006104 solid solution Substances 0.000 abstract description 2
- 229910052566 spinel group Inorganic materials 0.000 abstract description 2
- -1 magnesium aluminate Chemical class 0.000 abstract 2
- 239000003963 antioxidant agent Substances 0.000 abstract 1
- 230000003078 antioxidant effect Effects 0.000 abstract 1
- 239000011230 binding agent Substances 0.000 abstract 1
- 238000011031 large-scale manufacturing process Methods 0.000 abstract 1
- 230000006641 stabilisation Effects 0.000 abstract 1
- 238000011105 stabilization Methods 0.000 abstract 1
- 239000011449 brick Substances 0.000 description 31
- 239000004568 cement Substances 0.000 description 21
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 17
- 229910052742 iron Inorganic materials 0.000 description 14
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 10
- 150000001875 compounds Chemical class 0.000 description 9
- 238000003723 Smelting Methods 0.000 description 5
- 239000011819 refractory material Substances 0.000 description 5
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
- 239000012298 atmosphere Substances 0.000 description 4
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 3
- NDLPOXTZKUMGOV-UHFFFAOYSA-N oxo(oxoferriooxy)iron hydrate Chemical compound O.O=[Fe]O[Fe]=O NDLPOXTZKUMGOV-UHFFFAOYSA-N 0.000 description 3
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 description 2
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 description 2
- 229940067573 brown iron oxide Drugs 0.000 description 2
- 239000011651 chromium Substances 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- QDOXWKRWXJOMAK-UHFFFAOYSA-N dichromium trioxide Chemical compound O=[Cr]O[Cr]=O QDOXWKRWXJOMAK-UHFFFAOYSA-N 0.000 description 2
- 238000010304 firing Methods 0.000 description 2
- 230000004927 fusion Effects 0.000 description 2
- MHKWSJBPFXBFMX-UHFFFAOYSA-N iron magnesium Chemical compound [Mg].[Fe] MHKWSJBPFXBFMX-UHFFFAOYSA-N 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 230000003245 working effect Effects 0.000 description 2
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 description 1
- NACUKFIFISCLOQ-UHFFFAOYSA-N [Mg].[Cr] Chemical compound [Mg].[Cr] NACUKFIFISCLOQ-UHFFFAOYSA-N 0.000 description 1
- 229910000272 alkali metal oxide Inorganic materials 0.000 description 1
- AGWMJKGGLUJAPB-UHFFFAOYSA-N aluminum;dicalcium;iron(3+);oxygen(2-) Chemical compound [O-2].[O-2].[O-2].[O-2].[O-2].[Al+3].[Ca+2].[Ca+2].[Fe+3] AGWMJKGGLUJAPB-UHFFFAOYSA-N 0.000 description 1
- 239000011822 basic refractory Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000001354 calcination Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000010459 dolomite Substances 0.000 description 1
- 229910000514 dolomite Inorganic materials 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 238000003837 high-temperature calcination Methods 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 235000013980 iron oxide Nutrition 0.000 description 1
- VBMVTYDPPZVILR-UHFFFAOYSA-N iron(2+);oxygen(2-) Chemical class [O-2].[Fe+2] VBMVTYDPPZVILR-UHFFFAOYSA-N 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 239000012299 nitrogen atmosphere Substances 0.000 description 1
- QJGQUHMNIGDVPM-UHFFFAOYSA-N nitrogen group Chemical group [N] QJGQUHMNIGDVPM-UHFFFAOYSA-N 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 231100000004 severe toxicity Toxicity 0.000 description 1
- 238000002791 soaking Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000001308 synthesis method Methods 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
- 238000010189 synthetic method Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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Abstract
The invention provides synthetic hercynite and a production method thereof. The synthetic hercynite can be sintered by using a tunnel at a large scale. The synthetic hercynite comprises the following chemical components: industrial aluminum oxide, iron oxide red, magnesium aluminate spinel, a high-carbon material, an additional binder and an out-spayed antioxidant coating. The production method of the synthetic hercynite comprises the following steps: burdening, premixing, mixing, molding, thermal treatment, spraying a billet surface, sintering and synthesizing, and inspecting. The characteristics that the Fe2<+> and Mg2<+> ions are similar in radius, the magnesium aluminate spinel and the hercynite have the same crystal structures are utilized, so as to generate solid solutions of two spinels, and stabilization of the hercynite is utilized. The obtained hercynite is high in purity, large in crystal size, and good in stability. Meanwhile, the dead space of a tunnel kiln is utilized, an energy source is saved, the production technology is simplified, the cost is reduced, and large-scale production can be achieved.
Description
Technical field
The present invention relates to refractory industry field, a kind of especially synthesizing ferrum-aluminium spinelle and production method thereof.
Background technology
Magnesia chrome brick, because have a series of good applied at elevated temperature performances and superior extension kliner coating performance, is widely used in cement rotary kiln clinkering zone.But, along with the progress of calcination cement technology, the early stage traditional magnesia chrome brick by silicate combination, oneself is not through adapting to the requirement of Modern New dry-process cement rotary kiln production technique.Be directly periclasite and periclasite crystal grain, periclasite crystal grain and the direct combination of chromohercynite intergranule in brick in conjunction with the main feature of magnesia chrome brick, cause its opposing cement clinker erosion performance and hot strength to be all obviously better than traditional magnesia chrome brick.Directly to be formed through high-pressure molding, high-temperature calcination by high-purity synthesis material in conjunction with magnesia chrome brick; directly in conjunction with another feature of magnesia chrome brick be in the process using with cement kiln in grog react and generate stable kliner coating; stick protection tile body on the working face of brick, thereby there is better extension kliner coating performance.
Along with the change of the temperature in cement rotary kiln and atmosphere, can constantly there is the reaction of appraising at the current rate of iron in the ferric oxide in chromite, and this process can be accompanied by the variation of volume, makes the short texture of magnesia chrome brick, affects its work-ing life.The stable valence state of the oxide compound of iron in the time of low temperature be+3 valencys, and under hot conditions, Fe
3+unstable, change Fe into
2+; In the time that temperature declines, Fe
2+become again Fe
3+.Due to Fe
2+and Mg
2+ionic radius close, as the Fe in magnesia chrome brick
3+change Fe into
2+after, Fe
2+enter MgO lattice, formed (MgFe) O
sssosoloid, this process volumetric shrinkage approximately 20%; And in the time that temperature declines, be solid-solubilized in the Fe in MgO lattice
2+have again part precipitation, oxidation forms Fe
3+, make the volumetric expansion approximately 20% of material, as Fig. 1.So, although the high-temperature behavior of magnesium chromium material is very outstanding, hang kliner coating also fine,, suspend at rotary kiln, in maintenance process, often occur short texture, the strength decreased of magnesia chrome brick, or peel off damage etc., the most fatal weakness of magnesia chrome brick that Here it is.
Chromium sesquioxide in magnesia chrome brick in cement rotary kiln can react with the alkalimetal oxide in cement clinker or fuel next time and form with the chromic compound of severe toxicity in the condition of high temperature.Contain hypertoxic Cr
6+compound can be sneaked in cement clinker, these cement clinkers will cause Cr after using
6+pollution.Meanwhile, the useless brick after use penetrates into underground after being soaked by rainwater, causes large-scale water to pollute.
From the eighties mid-term, a lot of countries have had realized that the seriousness of sexavalent chrome environmental pollution, start to limit the use of magnesia chrome brick in cement kiln clinkering zone, the processing of the useless magnesia chrome brick of supervision, but, the processing costs of useless magnesia chrome brick is very high, so the cement industry of various countries is all found a kind of basic refractory that can substitute the magnesia chrome brick using at cement rotary kiln clinkering zone one after another.
Spinel brick, dolomite brick, magnesium zirconia block etc. can be replaced the substitute of magnesia chrome brick, on cement rotary kiln clinkering zone, use and all do not reach desirable effect, finding a kind of chromium-free brick that can use and reach desirable result of use on cement kiln clinkering zone becomes current very urgent problem.
The urceolus temperature of cement rotary kiln can not be too high, otherwise can cause kiln body deformability, and this just requires the refractory materials that clinkering zone is used will have low thermal conductivity, and the refractory materials that clinkering zone is used will have enough tetracalcium aluminoferrite (C
4aF) kliner coating is protected cement rotary kiln clinkering zone lining brick.Find by research kliner coating material, under iron, the common condition existing of aluminium element, contribute to form the C with stable performance
4aF kliner coating component, the refractory materials that exists ferro element to contribute to cement rotary kiln clinkering zone to use forms stable kliner coating.In magnesium-hercynite brick, contain the oxide compound of aluminium and iron, this is to form the requisite oxide compound of kliner coating, is conducive to form stable C simultaneously
4aF kliner coating, the most outstanding advantage of magnesium-hercynite brick that Here it is.
At present, the preparation of magnesium-hercynite brick mainly contains two kinds of modes: the one, and first synthesize and tap a blast furnace with Fe
2+the hercynite raw material that exists of form, then taking magnesia and the hercynite that synthesizes as raw material through moulding, the technique preparation such as burn till, be called for short pre-synthesis method; The 2nd, taking magnesium-aluminium spinel and magnesium iron sand etc. as raw material through moulding, the technique such as burn till and directly prepare, be called for short direct method.
Because appraising at the current rate of iron can cause larger volume variation, so in the time using the goods of iron content, try every possible means the price of iron to settle out.Prepare magnesium-hercynite brick taking the hercynite synthesizing as raw material, the price of the ferro element in brick can well be stabilized in to divalence, thereby well avoided the impact of the volume of temperature variation on goods.
In the composite oxides of ferriferous oxide and iron, can serve as Fe
2+carrier be incorporated into the namely ferrous aluminum spinel in brick.Occurring in nature iron seldom can exist with bivalent compound, thus can not find natural hercynite at occurring in nature, can only synthetic.
Synthetic hercynite is one of main raw material of producing magnesium-hercynite brick, and synthetic hercynite has two kinds of method-electric smelting methods and atmosphere protection sintering process.
Patent is (bulletin) number: CN102503478A openly, discloses a kind of synthetic method of electric smelting magnesium hercynite refractory material.The method is mixed the magnesia powder of 40% aluminum oxide powder, 28% brown iron oxide and 32% by quality percentage composition, high-temperature fusion more than 2200 DEG C, then cooling making.Described high-temperature fusion completes in mineral hot furnace.Be 60 hours described cooling time.It is high that the synthetic hercynite of electric smelting method has purity, the advantage that crystal size is large, but the cost of electric smelting method is high, and the thermal conductivity of the hercynite making is high.Hercynite is mainly used in making cement kiln rotary kiln magnesium iron aluminium brick at present, in order to reach save energy and to improve the cement rotary kiln object in work-ing life, often wishes that resistance to material used has lower thermal conductivity.Therefore the synthetic hercynite of electric smelting method is not the optimal selection of cement rotary kiln refractory materials.
Patent is (bulletin) number: CN101823872A openly, discloses a kind of method of synthesizing ferrous aluminum spinel.Embodiment is by Fe by iron containing compounds and aluminum contained compound
2+: A1
3+mol ratio carry out proportioning at 1: 2, the bonding agent of additional said mixture weight 1～6%, through mixing, compacting, burn till and make after dry under nitrogen atmosphere, firing temperature is 1300～1700 DEG C, soaking time is 2～12 hours.The method needs nitrogen protection in building-up process, and conventional hyperthermia tunnel Kiln, rotary kiln and shaft furnace etc. all can not ensure good closure at present.Therefore cannot specifically implement, even if drop into a large amount of nitrogen of needs of production, not only cost is high, and a large amount of compressed nitrogens also can bring huge potential safety hazard in process of production.
Open (bulletin) number: the 102583462A of patent, disclose a kind of synthesizing ferrum-aluminium spinelle method.The method is taking brown iron oxide, metallic aluminium powder and Reactive alumina as raw material, in vacuum oven, adopt solid sintering technology synthesizing ferrum-aluminium spinelle, utilize metallic aluminium reducing iron oxides to generate aluminum oxide and metallic iron, the ferric oxide of excessive existence reacts with metallic iron and generates iron protoxide, and last iron protoxide and the aluminum oxide of generation and the active oxidation reactive aluminum of interpolation generate hercynite.The method is utilized the reductive action of metallic aluminium to ferric oxide, although no longer need to control weakly reducing atmosphere, as long as can synthesize pure hercynite by sintering under vacuum condition, the volume of general vacuum oven is little, and cost is high, is not suitable for promoting the use of on a large scale.
Summary of the invention
The invention provides a kind of synthesizing ferrum-aluminium spinelle and production method thereof, can utilize the extensive sintering synthesizing ferrum-aluminium spinelle of tunnel furnace.
A kind of synthesizing ferrum-aluminium spinelle, its chemical composition and weight percent content are:
Described commercial alumina physical and chemical index is: weight percent Al
2o
3>=98.50%, granularity≤0.088mm;
Described red iron oxide is the scale oxide producing in steel rolling production process, and output is large, can meet the demand of large-scale commercial production.Its physical and chemical index is: weight percent Fe
2o
3>=95%, granularity≤0.088mm;
Described magnesium-aluminium spinel is electric melting magnesium aluminum spinel or sintering magnesium-aluminium spinel, and its physical and chemical index is: weight percent Al
2o
3: 72～74%, weight percent MgO:25～28%, weight percent SiO
2≤ 0.4%, granularity≤0.088mm;
Described high-carbon material is flaky graphite or high-carbon spent cathodes powder, and its physical and chemical index is: weight percent fixed carbon >=95%, granularity≤0.15mm;
Described bonding agent is the mixture of ethylene glycol and solid resin, or proportion is 1.2g/cm
3calcium lignosulfonate solution;
Described antioxidizing paint is liquid, and proportion is 1.20～1.25g/cm
3, composition comprises: Al
2o
3, MgO, AlN, C and a small amount of B
4c.
A production method for synthesizing ferrum-aluminium spinelle, the method comprises the following steps:
A. batching: according to above-mentioned synthesizing ferrum-aluminium spinelle weight percent raw material composition, accurately take desired raw material;
B. premix: first the material of working good is put into ball mill mill altogether, made the full and uniform mixing of material;
C. mixing: the material after premix is joined in mixing roll, then add bonding agent in material, mixing;
D. moulding: by the material mixing, be pressed into base substrate with friction press or hydropress under the pressure of 150MPa;
E. thermal treatment: by the base substrate suppressing thermal treatment at the temperature of 110～200 DEG C, to reach the effect of gaining in strength;
F. billet surface spraying: base substrate temperature, in the time of 40～60 DEG C, exposes five outside surfaces when blank sintering is synthetic, the antioxidizing paint of spraying 0.2mm thickness;
G. sintering is synthetic: anti-oxidation base substrate after treatment is carried out in the hyperthermia tunnel Kiln of producing magnesian to sintering and synthesize, when loading of kiln, base substrate is lain in a horizontal plane in normal magnesia burn till product above, do not spray facing down greatly of antioxidizing paint, outside other five spraying antioxidizing paint faces are exposed to.The temperature of clinkering zone is within the scope of 1550～1650 DEG C, and base substrate is 4～6 hours in the residence time of clinkering zone;
H. inspection: the standard that the synthesizing ferrum-aluminium spinelle after kiln discharge is formulated according to both sides of supply and demand is carried out sampling inspection, qualified product is transported to warehouse and preserves.
Of the present invention and existing similar technology is compared, and its significant beneficial effect is:
1. utilize Fe
2+and Mg
2+close and the magnesium-aluminium spinel of ionic radius and hercynite have the feature of same crystal structure, introduce magnesium-aluminium spinel, at high temperature Fe
2+with Mg
2+ion position part is exchanged, and generates the sosoloid of two kinds of spinels, is conducive to the stable of hercynite.
2. utilize the magnesium " steam " that under firing temperature, magnesian produces to be deposited on synthetic surfaces, form fine and close magnesium-aluminium spinel and pleonast(e) solid solution layer, the hercynite that protection forms.。
3. in sintering process, do not need atmosphere protection, compared with existing gas-protecting sintering method, the hercynite purity obtaining is high, and crystalline size is large, good stability.Meanwhile, utilize tunnel furnace idle space save energy, simplified production technique, reduced cost, can scale operation.
Brief description of the drawings
Fig. 1 is a kind of synthesizing ferrum-aluminium spinelle micro-structure diagram.
Embodiment
Specifically describe the present invention below by embodiment.
A kind of synthesizing ferrum-aluminium spinelle embodiment 1～4, its chemical composition and weight percent content see the following form:
A kind of chemical composition of synthesizing ferrum-aluminium spinelle and weight percent content table
A production method for synthesizing ferrum-aluminium spinelle, the method step is as follows:
A. batching: press above-described embodiment 1～4, a kind of chemical composition of synthesizing ferrum-aluminium spinelle and weight percent content table accurately take desired raw material;
B. premix: the material of working good is put into ball mill and grind altogether 30 minutes, material is fully mixed;
C. mixing: the compound after premix to be joined in mixing roll, then add bonding agent in material, mixing 8～10min;
D. moulding: the material mixing is poured in mould, and the pressure with friction press or hydropress with 150MPa, is pressed into material the base substrate of 230mm × 114mm × 30mm;
E. thermal treatment: the base substrate suppressing is processed 24 hours at the temperature of 110～200 DEG C, to reach the effect with some strength;
F. billet surface spraying: base substrate temperature, in the time of 40～60 DEG C, exposes 5 outside surfaces when blank sintering is synthetic, the antioxidizing paint of spraying 0.2mm thickness, main component is: Al
2o
3, MgO, AlN, C and a small amount of B
4c.；
G. sintering is synthetic: the base substrate after thermal treatment is carried out in the hyperthermia tunnel Kiln of producing magnesian to sintering and synthesize, the temperature of sintering zone of tunnel furnace is within the scope of 1550～1650 DEG C, and base substrate is 4～6 hours in the residence time of clinkering zone;
H. inspection: the synthesizing ferrum-aluminium spinelle after kiln discharge is decided through consultation to standard test according to both sides of supply and demand, and qualified product is transported to warehouse and preserves as ready.
Claims (2)
1. a synthesizing ferrum-aluminium spinelle, is characterized in that the chemical composition of this spinel and weight percent content are:
Described commercial alumina physical and chemical index is: weight percent Al
2o
3>=98.50%, granularity≤0.088mm;
Described red iron oxide is the scale oxide producing in steel rolling production process, and its physical and chemical index is: weight percent Fe
2o
3>=95%, granularity≤0.088mm;
Described magnesium-aluminium spinel is electric melting magnesium aluminum spinel or sintering magnesium-aluminium spinel, and its physical and chemical index is: weight percent Al
2o
3: 72～74%, weight percent MgO:25～28%, weight percent SiO
2≤ 0.4%, granularity≤0.088mm;
Described high-carbon material is flaky graphite or high-carbon spent cathodes powder, and its physical and chemical index is: weight percent fixed carbon >=95%, granularity≤0.15mm;
Described bonding agent is the mixture of ethylene glycol and solid resin, or proportion is 1.2g/cm
3calcium lignosulfonate solution;
Described antioxidizing paint is liquid, and proportion is 1.20～1.25g/cm
3, composition comprises: Al
2o
3, MgO, AlN, C and a small amount of B
4c.
2. a production method for synthesizing ferrum-aluminium spinelle, is characterized in that the method comprises the following steps:
A. batching: according to the chemical composition of above-mentioned synthesizing ferrum-aluminium spinelle and weight percent content, accurately take desired raw material;
B. premix: first the material of working good is put into ball mill mill altogether, made the full and uniform mixing of material;
C. mixing: the material after premix is joined in mixing roll, then add bonding agent in material, mixing;
D. moulding: by the material mixing, be pressed into base substrate with friction press or hydropress under the pressure of 150MPa;
E. thermal treatment: by the base substrate suppressing thermal treatment at the temperature of 110～200 DEG C, to reach the effect of gaining in strength;
F. billet surface spraying: base substrate temperature, in the time of 40～60 DEG C, exposes five outside surfaces when blank sintering is synthetic, the antioxidizing paint of spraying 0.2mm thickness;
G. sintering is synthetic: anti-oxidation base substrate after treatment is carried out in the hyperthermia tunnel Kiln of producing magnesian to sintering and synthesize, when loading of kiln, base substrate is lain in a horizontal plane in normal magnesia burn till product above, do not spray facing down greatly of antioxidizing paint, outside other five spraying antioxidizing paint faces are exposed to, the temperature of clinkering zone is within the scope of 1550～1650 DEG C, and base substrate is 4～6 hours in the residence time of clinkering zone;
H. inspection: the standard that the synthesizing ferrum-aluminium spinelle after kiln discharge is formulated according to both sides of supply and demand is carried out sampling inspection, qualified product is transported to warehouse and preserves.
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| CN104446541A (en) * | 2014-11-19 | 2015-03-25 | 辽宁科技大学 | Coating capable of enhancing kiln coating adherence of firing zone of rotary cement kiln and application of coating |
| CN104591292A (en) * | 2014-07-08 | 2015-05-06 | 河北科技大学 | Hercynite synthesis method |
| CN105198399A (en) * | 2015-08-31 | 2015-12-30 | 北京科技大学 | Preparing method for high-purity hercynite |
| CN106316382A (en) * | 2016-08-23 | 2017-01-11 | 北京建筑大学 | Spinel prepared with waterworks sludge and preparing method thereof |
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| WO2020108122A1 (en) * | 2018-11-28 | 2020-06-04 | 北京精冶源新材料股份有限公司 | Method for fabricating high thermal conductivity castable material, for blast furnace bottom hearth, as replacement for carbon brick |
| CN110092651A (en) * | 2019-05-17 | 2019-08-06 | 中钢集团耐火材料有限公司 | A kind of preparation method of aluminium chromium synthesis material |
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