CN104148160A - Anshan-type hematite silicon-control benefication method - Google Patents
Anshan-type hematite silicon-control benefication method Download PDFInfo
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- CN104148160A CN104148160A CN201410359163.9A CN201410359163A CN104148160A CN 104148160 A CN104148160 A CN 104148160A CN 201410359163 A CN201410359163 A CN 201410359163A CN 104148160 A CN104148160 A CN 104148160A
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Abstract
The invention relates to an Anshan-type hematite silicon-control benefication method. The Anshan-type hematite silicon-control benefication method is characterized by comprising three crushing times, screening, ball-milling classification and two reselection times, and includes particular steps of crushing, to be more specific, performing rough crushing, intermediate crushing, fine crushing and screening operation on Anshan-type hematite on working faces so that more than 90% of products have the particle sizes of 0-12mm; feeding the crushed and screened products into ball-mill and involute cyclone assemblies to be subjected to closed-circuit grinding, and classifying the crushed and screened products according to the thicknesses of the crushed and screened products; feeding flow which flows from thickness classification cyclones into roughing spiral chutes and concentration spiral chutes, and secondarily reselecting the flow to obtain ultimate concentrates with 65%-65.5% of iron and 5%-5.5% of SiO<2>. The Anshan-type hematite silicon-control benefication method has the advantages that technical processes are simple, technical and economic indexes are good, the grade of the iron concentrates is reduced from the original 67% and is 65.5%, but the contents of iron in tailings at the grade is reduced from the original 9.5% and is 9%, the recovery rate of the iron is increased by 1 percent, the yield is increased by 1.5 percents, the contents of the SiO<2> are effectively controlled and are 5%-5.5%, and excellent economic benefits can be acquired in follow-up sintering and smelting procedures.
Description
Technical field
The invention belongs to ferrous metal technique of preparing field, particularly a kind of beneficiation method of Anshan type bloodstone control silicon.
Background technology
China is the first in the world big steel producing country and iron ore consumption state, and along with economic sustained and rapid development, shortage of resources problem highlights day by day.At present, 2/3rds iron ore needs import, but simultaneously exists iron ore deposit utilization ratio not high (less than 70%), wastes the problems such as serious.Therefore, the raising level of resources utilization is very urgent.
Anshan type iron ore is the typical iron ore of China, and at present the unit technique of preparing such as Anshan iron and steel plant has had tremendous development, obtains 67% high-grade lay a good foundation for Anshan iron and steel plant ore dressing.
After Anshan iron and steel plant is carried Fe and reducing Si, what concentrate grade promoted before iron is larger, the content of silicon decline also than comparatively fast.But actual from producing, this just causes ore dressing metal recovery rate relatively to decline.The rate of recovery of iron declines, and beneficiation cost increases, production capacity step-down.And selected iron fine powder, in practice, also usually because SiO
2content is too low, causes sintering quality variation, therefore must be with addition of siliceous higher iron ore in smelting process, or directly with addition of a small amount of silica.
Therefore, too low silicone content (below 4.5%) not only makes the economy variation in ore dressing plant, makes the sintering in downstream become difficulty simultaneously.Carrying out to Anshan type iron ore grade rationally controlled, and guarantee ore dressing plant and sintering plant are obtained the economic benefit of comparatively optimizing.
Summary of the invention
The object of this invention is to provide a kind of rate of recovery that can improve concentrate iron, effectively control the content of silicon in iron ore concentrate, also improve sintering plant benefit simultaneously, realize the beneficiation method of the Anshan type bloodstone control silicon of doulbe-sides' victory.
The object of the invention is to be achieved through the following technical solutions.
A beneficiation method for Anshan type bloodstone control silicon, is characterized in that: comprise tertiary crushing, screening-once ball grinder graded-secondary gravity treatment, concrete steps are as follows:
1) fragmentation
It is that 0～12mm accounts for more than 90% that the Anshan type bloodstone of stope extraction is carried out to product granularity after coarse broken, the broken, thin broken and screening operation, and delivers in cylinder ore storage bin by adhesive tape conveyor;
2) ball grinder graded
Be that the product that 0～12mm accounts for more than 90% feeds overflowball mill by belt feeder by the granularity after crushing and screening, overflowball mill and involute a cluster cyclone carry out thickness grading and form closed circuit grinding, and-200 order breeze proportion control are 55% ~ 65%;
3) Gravity separation
The overflow of involute cyclone is fed and roughly selects spiral chute and carry out a gravity treatment, obtain iron content 54% ~ 58%, SiO
26 ~ 7.5% a gravity concentrate and a gravity tailings, the sand setting of cyclone turns back to ore grinding one time;
4) secondary Gravity separation
By iron content 54% ~ 58%, SiO
2a gravity concentrate of 6 ~ 7.5% feeds selected spiral chute and carries out secondary gravity treatment, obtains iron content 65% ~ 65.5%, SiO
25% ~ 5.5% secondary gravity concentrate and secondary gravity tailings, described iron content 65% ~ 65.5%, SiO
25% ~ 5.5% secondary gravity concentrate is final concentrate, and a described gravity tailings and secondary gravity tailings are merged into true tailings.
Feature of the present invention is: technological process is simple, technical-economic index is good, and research shows that iron concentrate grade drops to 65% ~ 65.5% from 66% ~ 67%, but in tailings grade, iron content is reduced to 9% from 9.5%, the rate of recovery of iron will improve 1 percentage point, and productive rate improves 1.5 percentage points.Adopt above-mentioned technique to make SiO
2content is controlled at 5% ~ 5.5%, and sinter quality improves greatly, makes subsequent smelting all obtain good economic benefit; Conversion is to blast furnace process, and iron per ton reduces by 2.5 yuan of smelting cost.
Brief description of the drawings
fig. 1 is process chart of the present invention.
Detailed description of the invention
Below in conjunction with accompanying drawing and example, this patent is described in further detail.
embodiment 1:
The Anshan type bloodstone raw ore composition using in embodiment 1 is:
Table 1 embodiment 1 Anshan type bloodstone composition %
| TFe | SiO 2 | CaO | MgO | Al 2O 3 |
| 28.4 | 57.5 | 0.5 | 0.6 | 0.4 |
1) fragmentation
Anshan type bloodstone to stope extraction carries out, in broken, thin broken and screening operation,
Wherein thick broken ore is 0～300mm, in broken ore be 0～100mm, thin broken and screening operation product granularity are that 0～12mm accounts for more than 92%, and deliver in cylinder ore storage bin by adhesive tape conveyor;
2) ball grinder graded
Be the overflowball mill that 0～12mm accounts for more than 92% product and fed by belt feeder model Ф 5.49 × 8.83m by the granularity after crushing and screening, the involute a cluster cyclone composition closed circuit grinding of overflowball mill and FX660 × 5-GT-HW, carry out thickness grading ,-200 order breeze proportion control are 57%;
3) Gravity separation
The overflow of involute cyclone is fed to Ф 1500mm and roughly select spiral chute and carry out a gravity treatment, obtain iron content 56%, SiO
26.5% a gravity concentrate and a gravity tailings, the sand setting of cyclone turns back to ore grinding one time;
4) secondary Gravity separation
By iron content 56%, SiO
2a gravity concentrate of 6.5% feeds the selected spiral chute of Ф 1500mm and carries out secondary gravity treatment, obtain secondary gravity concentrate and secondary gravity tailings, described secondary gravity concentrate is final concentrate, and a described gravity tailings and secondary gravity tailings are merged into true tailings.
Table 2 embodiment 1 obtains final concentrate composition %
| TFe | SiO 2 | CaO | MgO | Al 2O 3 |
| 65.1 | 5.3 | 0.42 | 0.41 | 0.32 |
embodiment 2:
The Anshan type bloodstone raw ore composition using is identical with embodiment 1.
1) fragmentation
Anshan type bloodstone to stope extraction carries out, in broken, thin broken and screening operation,
Wherein thick broken ore is 0～300mm, in broken ore be 0～100mm, thin broken and screening operation product granularity are that 0～12mm accounts for more than 95%, and deliver in cylinder ore storage bin by adhesive tape conveyor;
2) ball grinder graded
Be the overflowball mill that 0～12mm accounts for more than 95% product and fed by belt feeder model Ф 5.49 × 8.83m by the granularity after crushing and screening, the involute a cluster cyclone composition closed circuit grinding of overflowball mill and FX660 × 5-GT-HW, carry out thickness grading ,-200 order breeze proportion control are 62%;
3) Gravity separation
The overflow of involute cyclone is fed to Ф 1500mm and roughly select spiral chute and carry out a gravity treatment, obtain iron content 58%, SiO
26.2% a gravity concentrate and a gravity tailings, the sand setting of cyclone turns back to ore grinding one time;
4) secondary Gravity separation
By iron content 58%, SiO
2a gravity concentrate of 6.2% feeds the selected spiral chute of Ф 1500mm and carries out secondary gravity treatment, obtain secondary gravity concentrate and secondary gravity tailings, described secondary gravity concentrate is final concentrate, and a described gravity tailings and secondary gravity tailings are merged into true tailings.
Table 3 embodiment 2 obtains concentrate composition %
| TFe | SiO 2 | CaO | MgO | Al 2O 3 |
| 65.4 | 5.1 | 0.39 | 0.37 | 0.3 |
Visible by analysis of experiments above, to produce by this method iron ore concentrate, can make the ore dressing of Anshan type iron ore in the situation that slightly reducing iron concentrate grade, can increase iron ore concentrate output, has optimized the SiO in iron ore concentrate simultaneously
2, for follow-up sintering provides convenience.
Taking 2,000 ten thousand tons of Anshan type iron ore beneficiating factories as example, iron concentrate grade reduces by 0.5%, can increase by 300,000 tons of fine iron breeze output; As fine iron breeze grade reduces by 1%, increase by 600,000 tons of output, remarkable in economical benefits.
Claims (1)
1. Anshan type iron ore is put forward a beneficiation method for iron control silicon, it is characterized in that: comprise tertiary crushing, screening-once ball grinder graded-secondary gravity treatment, concrete steps are as follows:
1) fragmentation
It is that 0～12mm accounts for more than 90% that the Anshan type bloodstone of stope extraction is carried out to product granularity after coarse broken, the broken, thin broken and screening operation, and delivers in cylinder ore storage bin by adhesive tape conveyor;
2) ball grinder graded
Be 0～12mm by the granularity after crushing and screening, the product accounting for more than 90% feeds overflowball mill by belt feeder, overflowball mill and involute a cluster cyclone composition closed circuit grinding, carry out thickness grading, and wherein-200 order breeze proportion control are 55% ~ 65%;
3) Gravity separation
The overflow of involute cyclone is fed and roughly selects spiral chute and carry out a gravity treatment, obtain iron content 54% ~ 58%, SiO
26 ~ 7.5% a gravity concentrate and a gravity tailings, the sand setting of cyclone turns back to ore grinding one time;
4) secondary Gravity separation
By iron content 54% ~ 58%, SiO
2a gravity concentrate of 6 ~ 7.5% feeds selected spiral chute and carries out secondary gravity treatment, obtains iron content 65% ~ 65.5%, SiO
25% ~ 5.5% secondary gravity concentrate and secondary gravity tailings, described iron content 65% ~ 65.5%, SiO
25% ~ 5.5% secondary gravity concentrate is final concentrate, and a described gravity tailings and secondary gravity tailings are merged into true tailings.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106269204A (en) * | 2016-08-17 | 2017-01-04 | 鞍钢集团矿业有限公司 | A kind of energy saving technique processing extreme poverty bloodstone wet type pre-selecting rough concentrate |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5307938A (en) * | 1992-03-16 | 1994-05-03 | Glenn Lillmars | Treatment of iron ore to increase recovery through the use of low molecular weight polyacrylate dispersants |
| CN1785527A (en) * | 2004-12-12 | 2006-06-14 | 安阳钢铁集团有限责任公司 | Oxidation ore classification technology |
| CN101428248A (en) * | 2008-11-04 | 2009-05-13 | 中钢集团马鞍山矿山研究院有限公司 | Beneficiation method for recycling specularite |
| CN102205273A (en) * | 2011-05-18 | 2011-10-05 | 安徽金日盛矿业有限责任公司 | Beneficiation process of low-grade magnetite and specularite mixed ore |
-
2014
- 2014-07-28 CN CN201410359163.9A patent/CN104148160A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5307938A (en) * | 1992-03-16 | 1994-05-03 | Glenn Lillmars | Treatment of iron ore to increase recovery through the use of low molecular weight polyacrylate dispersants |
| CN1785527A (en) * | 2004-12-12 | 2006-06-14 | 安阳钢铁集团有限责任公司 | Oxidation ore classification technology |
| CN101428248A (en) * | 2008-11-04 | 2009-05-13 | 中钢集团马鞍山矿山研究院有限公司 | Beneficiation method for recycling specularite |
| CN102205273A (en) * | 2011-05-18 | 2011-10-05 | 安徽金日盛矿业有限责任公司 | Beneficiation process of low-grade magnetite and specularite mixed ore |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106269204A (en) * | 2016-08-17 | 2017-01-04 | 鞍钢集团矿业有限公司 | A kind of energy saving technique processing extreme poverty bloodstone wet type pre-selecting rough concentrate |
| CN106269204B (en) * | 2016-08-17 | 2018-07-27 | 鞍钢集团矿业有限公司 | A kind of energy saving technique of processing extreme poverty bloodstone wet type pre-selecting rough concentrate |
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Address after: 114001 Anshan District, Liaoning, No. 219 Road, No. 39, Tiedong Applicant after: Anshan Iron and Steel Group Mining Co., Ltd. Address before: 114001 Anshan District, Liaoning, No. 219 Road, No. 39, Tiedong Applicant before: Anshan Iron & Steel Group Mining Co., Ltd. |
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Application publication date: 20141119 |