CN101880765A - Preparation method of high-titanium type vanadium-titanium magnetite agglomerate added with limonite - Google Patents
Preparation method of high-titanium type vanadium-titanium magnetite agglomerate added with limonite Download PDFInfo
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Abstract
The invention belongs to the technical field of preparation methods of an agglomerate, and in particular relates to a preparation method of a high-titanium type vanadium-titanium magnetite agglomerate added with limonite. The invention aims to solve the first technical problem of providing a preparation method of a high-titanium type vanadium-titanium magnetite agglomerate added with limonite, which has the advantages of large strength and high rate of finished products. The method comprises the following concrete steps: adding limonite into the agglomerate raw material, and then, preparing the agglomerate, wherein the weight ratio of the agglomerate raw material to the limonite is 88-92:8-12, and the limonite is crushed to the granules of which the granularity is less than 1mm, wherein the weight of the granules of which the granularity is less than 0.074mm accounts for 10%-50% of the total weight. The invention improves the adding proportion of the limonite powder in the high-titanium type vanadium-titanium magnetite and reduces the cost of the raw material for production.
Description
Technical field
The invention belongs to agglomerate preparation method technical field, particularly add the preparation method of the high-titanium type vanadium-titanium magnetite agglomerate of limonite.
Background technology
Because in sintering production process, raw materials cost accounts for 80% of agglomerate total cost, and metallargists' polygamy that begins one's study adds the sintering technology and the production technique of limonite and cheap iron ore, picks up from the source, reduce the agglomerate cost significantly, reach the purpose of further reduction pig iron cost.Limonite is the ferric oxide that contains crystal water, and is nonmagnetic, and it can be formed by other iron ore weathering, and chemical formula is used mFe always
2O
3NH
2O represents.How much press crystal water content, the theoretical iron-holder of limonite can be increased to 66.1% from 55.2%.Wherein most of iron-bearing mineral is with 2Fe
2O
33H
2The O form exists.The general granularity of limonite is thicker, and loose porous, Well-recovered, melt temperature is low, easily assimilation, and bulk density is little.Limonite is used for sintering generally influences yield rate and unit-hour output, and the coke breeze unit consumption rises, and makes agglomerate tumbler index, cryogenic reducting powder index variation during high mixture ratio.Thereby limited limonite applying in steel enterprise sintering production.
At present, the high mixture ratio limonite research and produce mainly in Australia, country such as Japan, France, Korea S and China.Limonite uses in enterprises such as Australian BHP Iron And Steel Company, Japanese Nippon Steel, the little storehouse of SUMITOMO CHEMICAL metal Steel Plant, the light Yang Chang of Korea S Pohang Iron and Steel Corporation.The limonite proportioning of each big steel mill of Japan and Korea S's Pu item is generally more than 30%, and high reaches 40%～45% even 50%.China Zhongnan Polytechnic Univ once studied in great detail limonite sintering, and they think, suitably regulate the process system of limonite sintering, also can produce high-quality agglomerate based on the needle-like calcium ferrite with limonite.China uses limonite at present in sintering enterprise is representative with the Baosteel.Baosteel is from the early 1990s limonite that begins one's study, by commerical test for many years, improved the proportioning of spreading out He Kuang and Yang Dikuang significantly, reach about 35%, production data shows, SINTERING PRODUCTION is normal, sinter quality can satisfy the requirement of blast furnace, and obtained good economic benefit on Iron Ore Matching in Sintering.
Climb the steel raw materials for sintering mainly by high-Ti type V-Ti magnetite concentrate, v-ti magnetite concentrate is owing to contain higher TiO
2, MgO, Al
2O
3, and SiO
2Content is low, and granularity of concentrate is thick, and balling-up and water-absorbent are poor, easy-sintering not, and in sintering process, generated the crisp uhligite of property, sintering calcium ferrite low temperature bonding mutually less and its form different with ordinary sinter ore deposit calcium ferrite, cause that sinter strength is poor, yield rate is low.
Intensifying limonite sintering Study on Measures (Sichuan metallurgy, 2004 05 phases) set forth the high-titanium type vanadium-titanium magnetite sintering with addition of 8% limonite enhancements: the segregation of enhancing mixed material, the thick bed of material operation in hyperoxia position, high basicity sinter, optimize material structure, suitably relax the fuel granularity upper limit, to overcome the yield and quality disadvantageous effect that improves after the limonite ratio agglomerate.
The patent of Wuhan Iron And Steel Group Kunming Iron ﹠ Steel Co., Ltd: the method for manufacturing sintering ore from limonite with high content of crystal water, a kind of method of manufacturing sintering ore from limonite with high content of crystal water is provided, it is characterized in that it is a raw material with high mechanical water and crystal water limonite, through preparing burden, stir granulation, chassis charging, igniting sintering, sprinkling CaCl
2Solution gets agglomerate.Effectively overcome high crystal water limonite in sintering process because of the scaling loss height, easily shrink and form the thin-walled gross blow hole, thereby reduction sinter strength, influence the deficiency of agglomerate output, especially the adding of SYP adglutinate synergism agent, to suppress the crystal conversion of agglomerate, improve agglomerate low-temperature reduction disintegration energy, add and on agglomerate, spray CaCl
2Solution, suppress agglomerate reduction and efflorescence take place in 450～550 ℃ of temperature ranges, effectively reduce the secondary amount of powder that agglomerate produces under the reducing atmosphere condition in 450～550 ℃ of scopes in blast furnace, help improving the blast furnace permeability of stock column, improve the furnace condition anterograde degree of blast furnace, the final problem that solves the iron ore deposit anxiety is used limonite for industrialization promotion and is provided safeguard.
The patent of Nanjing Iron ﹠ Steel Factory No.2: the method for low-temperature sintering rhombohedral iron ore and brown ocher, the method of a kind of low-temperature sintering rhombohedral iron ore and brown ocher is provided, be used for that sintered iron ore becomes agglomerate with auxiliary materials such as lime on sinter machine, it is characterized in that: sintering temperature is at 1200～1295 ℃, kept 4～8 minutes in temperature more than 1100 ℃, sintering material layer thickness is 360～420mm, and sintering pallet runs at a low speed, and adopts segregation distribution.Basicity is controlled at 1.5～2.0, Al
2O
3/ SiO
2Ratio is controlled at 0.2～0.3, control low-carbon (LC) dosage, and the powdered carbon amount is 4%～5% of total compound.Low-temperature sintering can be produced and accompany the not Well-recovered agglomerate of molten ore inhomogeneous structure.
But existing method limonite addition is lower, if brown ocher is not handled, then because it will be limited in use in the high-titanium type vanadium-titanium magnetite agglomerate greatly to the agglomerating disadvantageous effect.
Summary of the invention
First technical problem to be solved by this invention provides the preparation method of the high-titanium type vanadium-titanium magnetite agglomerate of the interpolation limonite that a kind of intensity is big, yield rate is high, this method prepares agglomerate after being specially and adding limonite in the high-titanium type vanadium-titanium magnetite agglomerate raw material, high-titanium type vanadium-titanium magnetite agglomerate raw material and limonite weight ratio are 88～92: 8～12, limonite is crushed to below the 1mm, and wherein granularity accounts for 10%～50% of gross weight less than 0.074mm.
Granularity not the brown ocher granularity of refinement big, contain crystal water height, low, the easy assimilation of temperature of fusion, can increase the agglomerate porosity when being used for sintering, make the easy efflorescence of agglomerate, thereby reduce sinter strength.The brown ocher of handling through the inventive method, because its granularity is little, in the sinter mixture pelletization not as the granulation core, mainly be wrapped in oarse-grained outside, and it is little owing to the brown ocher granularity in sintering process, it is less that its crystal water decomposes the pore that produces, thereby weakened when the macrobead brown ocher produces agglomerate the disadvantageous effect of agglomerate, and the sinter strength that makes is big, yield rate is high.
Further, described high-titanium type vanadium-titanium magnetite agglomerate raw material is by weight by 44～48 parts of v-ti magnetite concentrates, 4～6 parts of the common fine ores of domestic higher-grade, 17～21 parts of imported iron ore fines, 5～8 parts of slaked lime proportionings, 5～6.5 parts of Wingdale proportionings, 4～6 parts of dosage of coke and join 37～43 parts of compositions of returning mine outward.The ratio of 1～3mm reaches more than 70% in the coke fines size.The ore main component is as shown in table 1.The sintering parameter: exhausting negative pressure 10～12kPa, 1050～1100 ℃ of ignition temperatures, ignition time 2～2.5min, grate-layer material 2～2.5kg.
Table 1 ore main component/weight percent %
| Title | V-ti magnetite concentrate | The common fine ore of domestic higher-grade | Imported iron ore fines | Domestic low-grade fine ore | Join outward and return mine | Brown fine iron ore |
| ??TFe | ??53.5～54.0 | ??57.0～59.0 | ??61.0～63.0 | ??45.0～48.0 | ??48.0～49.0 | ??45.0～48.0 |
| ??FeO | ??30.0～33.0 | ??15.0～20.0 | ??0.5～1.0 | ??0.5～1.0 | ??7.0～9.0 | |
| ??SiO 2 | ??3.0～3.5 | ??6.0～9.0 | ??2.0～4.0 | ??17.0～20.0 | ??5.0～6.0 | ??15.0～18.0 |
| ??CaO | ??0.8～1.2 | ??1.0～2.0 | ??＜0.5 | ??1.0～3.0 | ??10.0～12.0 | ??＜0.5 |
| Title | V-ti magnetite concentrate | The common fine ore of domestic higher-grade | Imported iron ore fines | Domestic low-grade fine ore | Join outward and return mine | Brown fine iron ore |
| ??MgO | ??2.0～3.5 | ??1.0～2.0 | ??＜0.5 | ??1.0～3.0 | ??2.0～3.0 | ??＜1.0 |
| ??Al 2O 3 | ??3.0～4.0 | ??1.0～2.0 | ??2.0～3.0 | ??3.0～5.0 | ??3.0～4.0 | ??1.0～2.0 |
| ??TiO 2 | ??12.0～13.0 | ??6.0～8.0 | ||||
| ??Ig | ??-1.0～-2.0 | ??1.0～2.0 | ??2.0～4.0 | ??2.0～4.0 | ??0.5～1.0 | ??8.0～12.0 |
Further, the preparation method who adds the high-titanium type vanadium-titanium magnetite agglomerate of limonite may further comprise the steps: 1) brown fine iron ore is carried out break process, make its mean particle size less than 1mm, wherein granularity accounts for 10～50% of gross weight less than 0.074mm; 2) the sintering coke powder is sieved processing, make that the ratio of 1～3mm reaches more than 70% in the coke fines size; 3) with brown fine iron ore and v-ti magnetite concentrate, the common fine ore of domestic higher-grade, imported iron ore fines, slaked lime, Wingdale, coke powder and join outward to return mine and take by weighing Hou Jiashui in proportion makes mixture moisture 7.2～7.4%, enters the rerolling machine 4min that granulates once more behind the mixing granulation 4min; 4) down draft sintering of lighting a fire of the compound after will granulating.The sintering parameter: exhausting negative pressure 10～12kPa, 1050～1100 ℃ of ignition temperatures, ignition time 2～2.5min, grate-layer material 2～2.5kg.
In the present invention and the existing high-Ti type V-Ti magnetite concentrate sintering with addition of 10% (mean particle size 3mm,＞3mm proportion is more than 50%) technical scheme of brown fine iron ore compares, improved brown ocher in high-titanium type vanadium-titanium magnetite with addition of ratio, reduced the raw materials for production cost.Also can improve 0.33～2.00 percentage point of agglomerate ISO tumbler index, the agglomerate mean particle size improves 1.2～1.7mm, and＞5mm yield rate improves 3.7～4.8 percentage points.
Embodiment
Test example 1 is not joined limonite
With v-ti magnetite concentrate 46 weight parts, common fine ore 14 weight parts of domestic higher-grade, imported iron ore fines 14 weight parts, domestic low-grade fine ore 6 weight parts, slaked lime proportioning 7 weight parts, Wingdale proportioning 4.6 weight parts, dosage of coke 4.8 weight parts, join proportioning 40 weight parts of returning mine outward and allocate mixing behind the blending bunker into, in a mixer, add water and make mixture moisture 7.15～7.2%, carry out entering behind the mixing granulation 4min rerolling machine 4min that granulates once more.Compound after the granulation is packed into and is carried out binder by granulating efficiency in φ 240 * 730mm sintered cup and handle bed thickness 650mm during sintering, sintering basicity CaO/SiO
2Be 2.2.
Table 2 ore main component/weight percent %
| Title | V-ti magnetite concentrate | The common fine ore of domestic higher-grade | Imported iron ore fines | Domestic low-grade fine ore | Join outward and return mine |
| ??TFe | ??53.90 | ??58.0 | ??62.40 | ??45.0 | ??48.6 |
| Title | V-ti magnetite concentrate | The common fine ore of domestic higher-grade | Imported iron ore fines | Domestic low-grade fine ore | Join outward and return mine |
| ??FeO | ??31.3 | ??16.2 | ??0.5 | ??0.5 | ??7.8 |
| ??SiO 2 | ??3.4 | ??7.6 | ??3.5 | ??18.2 | ??5.7 |
| ??CaO | ??0.9 | ??1.3 | ??0.3 | ??1.7 | ??12.5 |
| ??MgO | ??2.65 | ??1.2 | ??0.2 | ??1.4 | ??2.7 |
| ??Al 2O 3 | ??3.5 | ??1.8 | ??2.2 | ??3.7 | ??3.3 |
| ??TiO 2 | ??12.6 | ??6.8 | |||
| ??Ig | ??-1.5 | ??1.7 | ??2.6 | ??2.8 | ??0.5 |
The sintering parameter: exhausting negative pressure 12kPa, 1050 ℃ of ignition temperatures, ignition time 2.5min, grate-layer material 2.5kg.
Benchmark 1 agglomerate index is: agglomerate mean particle size 27.35mm, agglomerate ISO tumbler index 57.3% sintered cup utilization coefficient 1.509t/ (m
2.h),＞5mm yield rate 79.88%.
Test example 2 is with addition of untreated limonite
Composition of ores sees Table 2, v-ti magnetite concentrate is with addition of 46 weight parts, common fine ore proportioning 5 weight parts of domestic higher-grade, imported iron ore fines 19 weight parts, brown fine iron ore 10 weight parts, slaked lime proportioning 7 weight parts, Wingdale proportioning 5.9 weight parts, dosage of coke 4.9 weight parts are joined proportioning 40 weight parts of returning mine outward and are allocated mixing behind the blending bunker into, in a mixer, add water and make mixture moisture 7.15～7.25%, carry out entering behind the mixing granulation 4min rerolling machine 4min that granulates once more.Compound after the granulation is packed into and is carried out binder by granulating efficiency in φ 240 * 730mm sintered cup and handle bed thickness 650mm, sintering basicity CaO/SiO
2Be 2.2.
The sintering parameter: exhausting negative pressure 12kPa, 1050 ℃ of ignition temperatures, ignition time 2.5min, grate-layer material 2.5kg.
Benchmark 2 agglomerate indexs are: agglomerate mean particle size 22.52mm, agglomerate ISO tumbler index 54.33%, sintered cup utilization coefficient 1.518t/ (m
2.h),＞5mm yield rate 74.78%.
Embodiment 1
Composition of ores sees Table 2, the batching parameter is: v-ti magnetite concentrate is with addition of 46 weight parts, common fine ore proportioning 5 weight parts of domestic higher-grade, imported iron ore fines 19 weight parts, brown fine iron ore 10 weight parts (are handled through fine grinding, wherein＜the 0.074mm proportion is 13%), slaked lime proportioning 7 weight parts, Wingdale proportioning 5.9 weight parts, dosage of coke 4.9 weight parts and join proportioning 40 weight parts of returning mine outward and allocate mixing behind the blending bunker into, in a mixer, add water and make mixture moisture 7.25～7.35%, carry out entering behind the mixing granulation 4min rerolling machine 4min that granulates once more.Compound after the granulation is packed into and is carried out binder by granulating efficiency in φ 240 * 730mm sintered cup and handle bed thickness 650mm, sintering basicity CaO/SiO
2Be 2.2.
The sintering parameter: exhausting negative pressure 12kPa, 1050 ℃ of ignition temperatures, ignition time 2.5min, grate-layer material 2.5kg.
The agglomerate index that obtains is: agglomerate mean particle size 23.74mm, agglomerate ISO tumbler index 54.67%, sintered cup utilization coefficient 1.498t/ (m
2.h),＞5mm yield rate 78.53%.
Embodiment 2
Composition of ores sees Table 2, the batching parameter is: v-ti magnetite concentrate is with addition of 46 weight parts, common fine ore proportioning 5 weight parts of domestic higher-grade, imported iron ore fines 19 weight parts, brown fine iron ore 10 weight parts (are handled through fine grinding, wherein＜the 0.074mm proportion is 35%), slaked lime proportioning 7 weight parts, Wingdale proportioning 5.9 weight parts, dosage of coke 4.9 weight parts and join proportioning 40 weight parts of returning mine outward and allocate mixing behind the blending bunker into, in a mixer, add water and make mixture moisture 7.25～7.35%, carry out entering behind the mixing granulation 4min rerolling machine 4min that granulates once more.Compound after the granulation is packed into and is carried out binder by granulating efficiency in φ 240 * 730mm sintered cup and handle bed thickness 650mm, sintering basicity CaO/SiO
2Be 2.2.
The sintering parameter: exhausting negative pressure 12kPa, 1050 ℃ of ignition temperatures, ignition time 2.5min, grate-layer material 2.5kg.
The agglomerate index that obtains is: agglomerate mean particle size 24.16mm, agglomerate ISO tumbler index 56.00%, sintered cup utilization coefficient 1.528t/ (m
2.h),＞5mm yield rate 79.31%.
Embodiment 3
Composition of ores sees Table 2, the batching parameter is: v-ti magnetite concentrate is with addition of 46 weight parts, common fine ore proportioning 5 weight parts of domestic higher-grade, imported iron ore fines 19 weight parts, brown fine iron ore 10 weight parts (are handled through fine grinding, wherein＜the 0.074mm proportion is 49%), join proportioning 40 weight parts of returning mine outward, slaked lime proportioning 7 weight parts, Wingdale proportioning 5.9 weight parts, dosage of coke 4.9 weight parts are allocated mixing behind the blending bunker into, add water and make mixture moisture 7.3～7.4% in a mixer, carry out entering behind the mixing granulation 4min rerolling machine 4min that granulates once more.Compound after the granulation is packed into and is carried out binder by granulating efficiency in φ 240 * 730mm sintered cup and handle bed thickness 650mm, sintering basicity CaO/SiO
2Be 2.2.
The sintering parameter: exhausting negative pressure 12kPa, 1050 ℃ of ignition temperatures, ignition time 2.5min, grate-layer material 2.5kg.The agglomerate index is: agglomerate mean particle size 24.24mm, agglomerate ISO tumbler index 56.33%, sintered cup utilization coefficient 1.537t/ (m
2.h),＞5mm yield rate 78.67%.
Claims (5)
1. add the preparation method of the high-titanium type vanadium-titanium magnetite agglomerate of limonite, prepare agglomerate after in the high-titanium type vanadium-titanium magnetite agglomerate raw material, adding limonite, it is characterized in that: high-titanium type vanadium-titanium magnetite agglomerate raw material and limonite weight ratio are 88～92: 8～12, limonite is crushed to below the 1mm, and wherein granularity accounts for 10%～50% of gross weight less than 0.074mm.
2. according to the preparation method of the high-titanium type vanadium-titanium magnetite agglomerate of the described interpolation limonite of claim 1, it is characterized in that: described high-titanium type vanadium-titanium magnetite agglomerate raw material is by weight by 44～48 parts of v-ti magnetite concentrates, 4～6 parts of the common fine ores of domestic higher-grade, 17～21 parts of imported iron ore fines, 5～8 parts of slaked limes, 5～6.5 parts in Wingdale, 4～6 parts of coke powders and join 37～43 parts of compositions of returning mine outward.
3. according to the preparation method of the high-titanium type vanadium-titanium magnetite agglomerate of the described interpolation limonite of claim 2, it is characterized in that: the ratio of 1～3mm reaches more than 70% in the coke fines size.
4. according to the preparation method of the high-titanium type vanadium-titanium magnetite agglomerate of claim 2 or 3 described interpolation limonites, it is characterized in that: the preparation of described agglomerate is that high-titanium type vanadium-titanium magnetite agglomerate raw material and limonite are mixed into compound, add water and make mixture moisture 7.2～7.4%, the back sintering of granulating.
5. according to the preparation method of the high-titanium type vanadium-titanium magnetite agglomerate of the described interpolation limonite of claim 4, it is characterized in that: the sintering parameter is exhausting negative pressure 10～12kPa, 1050～1100 ℃ of ignition temperatures, ignition time 2～2.5min, grate-layer material 2～2.5kg.
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| CN102242255A (en) * | 2011-06-27 | 2011-11-16 | 攀钢集团有限公司 | Method for sintering high-titanium vanadium titanium magnetite concentrate mixed with limonite |
| CN102586591A (en) * | 2012-03-09 | 2012-07-18 | 中南大学 | Process for producing sintered ore for ironmaking through blast furnace from high-aluminum limonite |
| CN102925671A (en) * | 2012-11-14 | 2013-02-13 | 攀钢集团研究院有限公司 | Sintering method of iron ore with added limonite |
| CN103627894A (en) * | 2013-11-29 | 2014-03-12 | 攀钢集团攀枝花钢钒有限公司 | Method for sintering vanadium/titanium magnetite concentrate and siderite |
| CN104711415A (en) * | 2015-04-09 | 2015-06-17 | 攀钢集团攀枝花钢铁研究院有限公司 | Limonite sintering treatment method |
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| CN102242255B (en) * | 2011-06-27 | 2014-08-20 | 攀钢集团有限公司 | Method for sintering high-titanium vanadium titanium magnetite concentrate mixed with limonite |
| CN102586591A (en) * | 2012-03-09 | 2012-07-18 | 中南大学 | Process for producing sintered ore for ironmaking through blast furnace from high-aluminum limonite |
| CN102925671A (en) * | 2012-11-14 | 2013-02-13 | 攀钢集团研究院有限公司 | Sintering method of iron ore with added limonite |
| CN103627894A (en) * | 2013-11-29 | 2014-03-12 | 攀钢集团攀枝花钢钒有限公司 | Method for sintering vanadium/titanium magnetite concentrate and siderite |
| CN104711415A (en) * | 2015-04-09 | 2015-06-17 | 攀钢集团攀枝花钢铁研究院有限公司 | Limonite sintering treatment method |
| CN106399673A (en) * | 2016-11-30 | 2017-02-15 | 重庆大学 | Method for improving compressive strength of vanadium titano-magnetite sintered ore |
| CN107460310A (en) * | 2017-08-09 | 2017-12-12 | 包头钢铁（集团）有限责任公司 | A kind of method for preparing sintering deposit |
| CN108950111A (en) * | 2018-08-13 | 2018-12-07 | 攀枝花市立宇矿业有限公司 | High-grade blast-furnace smelting method for vanadium titano-magnetite |
| CN109112295A (en) * | 2018-09-04 | 2019-01-01 | 云南德胜钢铁有限公司 | A kind of your placer raw materials for sintering and preparation method thereof |
| CN110672458A (en) * | 2019-09-04 | 2020-01-10 | 攀钢集团攀枝花钢铁研究院有限公司 | Method for rapidly evaluating vanadium-titanium magnetite concentrate agglomeration economy |
| CN110672458B (en) * | 2019-09-04 | 2022-05-24 | 攀钢集团攀枝花钢铁研究院有限公司 | Method for rapidly evaluating vanadium-titanium magnetite concentrate agglomeration economy |
| CN110564953A (en) * | 2019-09-10 | 2019-12-13 | 攀钢集团攀枝花钢铁研究院有限公司 | Method for improving quality of vanadium-titanium magnetite concentrate sinter |
| CN111154970A (en) * | 2020-01-07 | 2020-05-15 | 武钢集团昆明钢铁股份有限公司 | Method for improving quality of sinter in sintering production of large-proportion limonite |
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