CN103305688A - Industrial preparation method of high-fine-powder-rate ore agglomerates - Google Patents
Industrial preparation method of high-fine-powder-rate ore agglomerates Download PDFInfo
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- CN103305688A CN103305688A CN2013102364328A CN201310236432A CN103305688A CN 103305688 A CN103305688 A CN 103305688A CN 2013102364328 A CN2013102364328 A CN 2013102364328A CN 201310236432 A CN201310236432 A CN 201310236432A CN 103305688 A CN103305688 A CN 103305688A
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Abstract
The invention relates to an industrial preparation method of high-fine-powder-rate ore agglomerates. The industrial preparation method is characterized by comprising the following steps of: uniformly mixing a ferrous raw material with bentonite which accounts for 2-6 weight percent of the ferrous raw material to prepare acidic fresh pellets, wherein the particle size of the fresh pellets is 4-10mm; uniformly mixing and granulating raw materials including iron ore concentrates or a mixture of the iron ore concentrates and superfine iron ore concentrates, imported iron ore powder, limestone, light-burned dolomite, quicklime and high-alkalinity sintering mixture of fine coke in a primary mixer and a secondary mixer granulator, and adding the acidic fresh pellets to form an acid-alkali mixture before the materials are put into a distributing belt of a sintering machine, wherein the added amount of the fresh pellets accounts for 20-60 weight percent of the externally distributed high-alkalinity sintering mixture; and distributing the acid-alkali mixture to a trolley of the sintering machine through a swinging belt, a wide belt and a nine-roller distributor, and igniting and roasting to obtain high-quality ore agglomerates. The industrial preparation method has the advantage that the problems of poor air permeability and sintering difficulty during sintering of high-precision powder and in the sintering process of the ferrous raw material containing superfine concentrates are solved.
Description
Technical field
The invention belongs to the ferrous metallurgy field, relate to and prepare the preparation method that blast furnace ironmaking is used the ore agglomerates under a kind of high-precision powder rate condition.
Background technology
In recent years along with the fast development of Iron And Steel Industry, demand to iron ore constantly increases, and causes domestic and international iron ore market value to go up and supply appearance anxiety, for this reason, many iron and steel enterprises have to develop new iron ore deposit, to alleviate the rising of steel cost.Baogang is when possessing 1,000 ten thousand tons of pig iron production capacities, and the also relatively low self-produced iron ore deposit of active development price is to reduce ironmaking cost.The self-produced iron ore concentrate of Baogang is compared with domestic common concentrate, and granularity is thinner, and-200 orders account for more than 90%, especially ultra-fine iron ore concentrate newly developed, granularity is thinner, and-200 orders account for more than 95%,-300 orders account for more than 75%, on granularity, this iron ore concentrate more is applicable to pelletizing process, but in the middle of pelletizing process is used, owing to contain fluorine, potassium, sodium harmful element, pelletizing process be with addition of to a certain degree can causing the pellet rate of expansion to raise, and exceeds the normal expansion scope, influences blast furnace production.For this reason, can only be used for sintering process.But consequent problem is that smart powder rate height influences the ventilation property in the sinter bed in the sintering iron charge, influences SINTERING PRODUCTION.
Summary of the invention
The objective of the invention is at smart powder rate height, especially to contain iron-bearing material bed permeability variation, the difficult difficult problem of burning of sintering when the ore agglomerates of ultra-fine concentrate, a kind of high-precision powder rate ore agglomerates's industrial production process is provided.
The present invention realizes by following steps:
(1) preparation of acid green-ball: with iron-bearing material and after accounting for the wilkinite mixing of iron-bearing material weight percent 2% ~ 6%, be prepared into acid green-ball, the green-ball granularity is 4mm ~ 10mm; Wherein iron-bearing material is iron ore concentrate or iron ore concentrate and the mixing of ultra-fine iron ore concentrate, and the main chemical compositions that described iron ore concentrate comprises is: TFe content is 65% ~ 66%, FeO content is 23% ~ 25%, CaO content is 0.8%, SiO
2Content is that 3% ~ 4% ,-200 orders account for more than 80%; Ultra-fine iron ore concentrate comprise main chemical compositions be: TFe content is 65% ~ 66%, FeO content is 23% ~ 25%, CaO content is 1.0% ~ 1.2%, SiO
2Content is that 1% ~ 2% ,-200 orders account for more than 90%, and-300 orders account for more than 75%.
(2) preparation of high-basicity sintering compound: raw materials usedly be: iron ore concentrate or iron ore concentrate mix with ultra-fine iron ore concentrate, the imported iron ore powder, Wingdale, light dolomite, unslaked lime and coke powder, each component is prepared burden according to weight part: mix 50 ~ 60 parts of iron ore concentrate or iron ore concentrate and ultra-fine iron ore concentrate, 25 ~ 15 parts in imported iron ore powder, 4 ~ 5 parts in Wingdale, 3 ~ 4 parts of unslaked limes, 4 ~ 6 parts of light dolomites, 4 ~ 6 parts of coke powders, wherein the imported iron ore powder is rhombohedral iron ore, and its main chemical compositions that comprises is 58% ~ 62% for TFe content, FeO content＜0.55%, CaO content＜0.3%, SiO
2Content is 4% ~ 5%, and size composition-3mm accounts for 40% ~ 45%, and+10mm grade is lower than 1%;
(3) mixing of high-basicity sintering compound and acid green-ball: with the high-basicity sintering compound after mixer, a secondary mixer-granulator carry out mixing respectively, granulate, before entering the sinter machine distributing belt, acid green-ball is added formation soda acid compound, and the add-on of green-ball accounts for the outer of high-basicity sintering material weight percent and joins 20% ~ 60%;
(4) sintering: the soda acid compound that step (3) is obtained passes through swing belt, wide belt, nine roller distributor cloth to sintering pallet, obtains the high-quality ore agglomerates by igniting, roasting.
This industrial production process is applicable to the blast furnace ore agglomerates who produces any basicity between 1.4 ~ 2.2, and flux is selected for use and is Wingdale, light dolomite powder (or ground dolomite), unslaked lime.Wingdale and unslaked lime are mainly used in adjusting ore agglomerates's basicity, and its addition is obtained by charge calculation according to required production ore agglomerates's basicity; Light dolomite powder (or ground dolomite) is mainly used in adjusting ore agglomerates's MgO content, and its addition is that the MgO content according to required production ore agglomerates is obtained by charge calculation.The ore agglomerates's that present method is produced MgO content is controlled to be 1.8% ~ 2.6%.
Fuel is selected coke powder the best for use, also can select coal dust for use, or the mixture of coke powder and coal dust.The control of fuel ratio will be regulated according to its difference of producing ore agglomerates's basicity.Be that 2.0 ore agglomerates is example with production basicity, if fuel is selected coke powder for use, its proportioning accounts for 4% ~ 6% of whole compounds.Under the situation that other conditions remain unchanged, along with the reduction of ore agglomerates's basicity, burnup has increase.
Advantage of the present invention is: can use the thinner iron ore concentrate of granularity (or the ultra-fine iron ore concentrate of granularity) in a large number on existing sintering process.Technological process is, earlier the thin iron ore concentrate (or the ultra-fine iron ore concentrate of granularity) of a part of granularity is prepared into the green-ball that grade is 4 ~ 10mm separately, mix with the mixture of iron-bearing material (comprising iron ore concentrate, ultra-fine iron ore concentrate and powdered iron ore), flux and the fuel of remainder again, afterwards, by roasting on the distribution device cloth sintering pallet, finished product is the composite sinter that is embedded with acid pellet.This method has solved high-precision powder rate sintering, especially adopts ultra-fine concentrate sintering to cause bed permeability variation, the difficult difficult problem of burning of sintering.
Embodiment 1
Two 265m of Baogang
2Sinter machine, bed thickness are 700mm.Under identical finished product ore deposit basicity (2.0) and MgO content (2.4) condition, adopt this method, simultaneously the control of green-ball proportioning was joined 20% ~ 26% o'clock outside, compare with normal sintering technology, the ratio of iron ore concentrate in the iron-bearing material can be improved 10 ~ 15 percentage points on 60% ~ 62% basis, wherein the proportioning of ultra-fine iron ore concentrate (300 orders reach 75% ~ 80%) in iron-bearing material can reach 30% ~ 45%.The while permeability of sintering material bed does not have variation, and the sinter machine machine speed is responsible for negative pressure by 14.11 kpa that implement after 14.52 preceding kpa are reduced to enforcement by the 2.3m/min that implements after preceding 2.2m/min is increased to enforcement; After implementing this method, unit-hour output reaches 320 t/ platform .h ~ 330 t/ platform .h, improves 10 ~ 15 t/ platform .h before implementing; Utilization coefficient reaches 1.2 t/m
2.h ~ 1.3 t/m
2.h, implement preceding raising 3% ~ 5%.Finished product ore deposit grade does not have considerable change, is 56% ~ 57%; The intensity in finished product ore deposit slightly descends before implementing, and between 75% ~ 76%, but can satisfy the demand that big blast furnace is produced.
Embodiment 2
265 m of Baogang
2Sinter machine, bed thickness 700mm.Adopt the ore agglomerates of this method production basicity 1.5 ~ 1.6.Under the identical condition of iron charge kind and proportioning, when outside the green-ball proportioning reaches, joining 40 ~ 48%, be that 2.0 agglomerate is compared with basicity that normal sintering technology is produced, after the enforcement, unit-hour output reaches 313.24 t/h, utilization coefficient 1.182 t/m
2.h, implement preceding raising 6.9%; Burnup reduces by 2 ~ 3 kg/t; Finished product ore deposit barrate strength index reduces by 1.5 ~ 2.0 percentage points 73% ~ 75% before implementing; Grade of sinter is 57% ~ 58%, improve 0.3 ~ 0.5 percentage point before implementing, and the metallurgical performance in finished product ore deposit still can keep the metallurgical performance of the high basicity sinter that normal sintering technology produces under this basicity condition, this agglomerate reductibility is 75% ~ 80%, and cryogenic reducting powder index is between 70% ~ 80%.
Claims (3)
1. a high-precision powder rate ore agglomerates industrial production process is characterized in that: with iron-bearing material with account for the wilkinite mixing of iron-bearing material weight percent 2% ~ 6% after, be prepared into acid green-ball, the green-ball granularity is 4mm ~ 10mm; With raw material be: the high-basicity sintering compound of the mixing of iron ore concentrate or iron ore concentrate and ultra-fine iron ore concentrate, imported iron ore powder, Wingdale, light dolomite, unslaked lime and coke powder is after mixer, a secondary mixer-granulator carry out mixing respectively, granulate, before entering the sinter machine distributing belt, acid green-ball is added formation soda acid compound, and the add-on of green-ball accounts for the outer of high-basicity sintering material weight percent and joins 20% ~ 60%; The soda acid compound by swinging belt, wide belt, nine roller distributor cloth to sintering pallet, is obtained the high-quality ore agglomerates by igniting, roasting.
2. high-precision powder rate ore agglomerates's according to claim 1 industrial production process, it is characterized in that: the main chemical compositions that described iron ore concentrate comprises is: TFe content is 65% ~ 66%, FeO content is 23% ~ 25%, CaO content is 0.8%, SiO
2Content is that 3% ~ 4% ,-200 orders account for more than 80%; The main chemical compositions that ultra-fine iron ore concentrate comprises is: TFe content is 65% ~ 66%, FeO content is 23% ~ 25%, CaO content is 1.0% ~ 1.2%, SiO
2Content is that 1% ~ 2% ,-200 orders account for more than 90%, and-300 orders account for more than 75%; The imported iron ore powder is rhombohedral iron ore, and its main chemical compositions that comprises is: TFe content is 58% ~ 62%, FeO content＜0.55%, CaO content＜0.3%, SiO
2Content is 4% ~ 5%, and size composition-3mm accounts for 40% ~ 45%, and+10mm grade is lower than 1%.
3. high-precision powder rate ore agglomerates's according to claim 1 industrial production process, it is characterized in that: each component of the raw material of high-basicity sintering compound is prepared burden according to weight part: iron ore concentrate or iron ore concentrate and ultra-fine iron ore concentrate mix 50 ~ 60 parts, 25 ~ 15 parts in imported iron ore powder, 4 ~ 5 parts in Wingdale, 3 ~ 4 parts of unslaked limes, 4 ~ 6 parts of light dolomites, 4 ~ 6 parts of coke powders.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103924064A (en) * | 2014-04-08 | 2014-07-16 | 首钢总公司 | Method for manufacturing sinter |
| CN111610305A (en) * | 2020-04-28 | 2020-09-01 | 北京科技大学 | Method for quantitatively evaluating crushing resistance and wear resistance of iron alloy for steelmaking by using rotary drum |
| RU2809893C1 (en) * | 2023-06-05 | 2023-12-19 | Николай Владимирович Колесников | Method for producing granular iron-containing slag |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1844420A (en) * | 2006-03-14 | 2006-10-11 | 中南大学 | Method for producing sintered mineral with middle and low basicity |
| CN1924035A (en) * | 2005-09-01 | 2007-03-07 | 中南大学 | Composite agglomeration technology of iron powdered ore |
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2013
- 2013-06-14 CN CN2013102364328A patent/CN103305688A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1924035A (en) * | 2005-09-01 | 2007-03-07 | 中南大学 | Composite agglomeration technology of iron powdered ore |
| CN1844420A (en) * | 2006-03-14 | 2006-10-11 | 中南大学 | Method for producing sintered mineral with middle and low basicity |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103924064A (en) * | 2014-04-08 | 2014-07-16 | 首钢总公司 | Method for manufacturing sinter |
| CN103924064B (en) * | 2014-04-08 | 2017-03-29 | 首钢总公司 | A kind of manufacture method of sintering deposit |
| CN111610305A (en) * | 2020-04-28 | 2020-09-01 | 北京科技大学 | Method for quantitatively evaluating crushing resistance and wear resistance of iron alloy for steelmaking by using rotary drum |
| RU2809893C1 (en) * | 2023-06-05 | 2023-12-19 | Николай Владимирович Колесников | Method for producing granular iron-containing slag |
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Application publication date: 20130918 |