CN101440416A - Iron increase and phosphorous reduction method for oolitic high phosphorus hematite - Google Patents
Iron increase and phosphorous reduction method for oolitic high phosphorus hematite Download PDFInfo
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- CN101440416A CN101440416A CNA2008101633932A CN200810163393A CN101440416A CN 101440416 A CN101440416 A CN 101440416A CN A2008101633932 A CNA2008101633932 A CN A2008101633932A CN 200810163393 A CN200810163393 A CN 200810163393A CN 101440416 A CN101440416 A CN 101440416A
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Abstract
The invention discloses an iron-increasing phosphorous-reducing method for oolitic high-phosphorus hematite. The method comprises the following steps: (1) phosphorus-containing oolitic hematite is crushed till the particle size is not more than 0.25 millimeter, and then is added to a roaster; (2) a reduction chamber of the roaster is supplied with reduction gas, and crushed material is reduced for 10 to 60 minutes at a temperature between 700 and 1,450 DEG C in the roaster; (3) reduced mineral is isolated from oxygen, cooled to not higher than 100 DEG C and then magnetically separated; obtained coarse iron powder per ton is added with 1 to 1.5 kilograms of sodium silicate; the obtained coarse iron powder is ball-milled till the particle size is not more than 0.055 millimeter; obtained fine iron powder is immersed in acid solution with the concentration between 0.5 and 18 percent at normal temperature for 30 to 300 minutes; and the proportion of the acid solution to the fine iron powder is not less than 1:1; and (4) the fine iron powder is poured into a hydroextractor so as to reduce phosphoric acid. The method has the advantages of simple process, low requirement on the quality of raw material and the particle size of ore, no consumption of electric energy and high-quality coke, low energy consumption, high phosphorous reducing rate and high metal yield.
Description
Technical field
The invention belongs to weakly magnetic iron ore and put forward the technical field that phosphorus falls in iron, what relate in particular to a kind of roe shape high-phosphorus hematite carries the iron method for reducing phosphorus.
Background technology
Roe shape high-phosphorus hematite also claims " Ningxiang's formula " high-phosphorus hematite, and it has poor characteristics in high phosphorus, high silicon, high alumina, low-sulfur, the iron content.The ore iron content is generally 35%-55%, phosphorous 0.4%-0.6%, and the part ore is phosphorous to surpass 1.0%, and local ore bed contains the CaO height, is self-fluxing ore.This iron ore has olitie texture, and rhombohedral iron ore is flakey, fibrous and gangue mineral mixes numerous shape embedding cloth.Because rhombohedral iron ore crystal grain superfine (＜10 μ m), sorting in the separation quite difficulty, so roe shape high-phosphorus hematite is because of falling the phosphorus technology and make this part iron ore deposit effectively be exploited utilization less than the reasonable unfeasible iron of carrying.
Summary of the invention
The invention provides that a kind of technology is simple, energy consumption is low, reduction process not consumed power and high-quality coke, low to the raw materials quality granularity requirements, the high roe shape high-phosphorus hematite of phosphorus rate and recovery rate of iron falls and carry the iron method for reducing phosphorus.
For achieving the above object, the technical solution used in the present invention is: roe shape high-phosphorus hematite carry the iron method for reducing phosphorus, it carries out according to the following steps:
1. after phosphorous oolitic hematite being crushed to particle diameter and being not more than 0.25mm, add in the stoving oven;
2. feed the reducing gas of capacity toward stoving oven reduction chamber, broken material carries out abundant reduction reaction under 700-1450 ℃ condition in stoving oven, and the recovery time is 10-60min;
3. the reduction after mineral through oxygen barrier be cooled to be not more than 100 ℃ after magnetic separation, the crude iron powder that obtains is made ball milling behind the dispersion agent by the water glass of adding per ton 1-1.5 kilogram, the gained crude iron sphere of powder is milled to particle diameter is not more than 0.055mm, the smart powder of gained iron immerses at normal temperatures and carries out the phosphorus dissolving in the acid solution that weight percent is 0.5%-18%, time is 30-300 second, and the ratio of the smart powder of acid solution and iron is not less than 1:1;
4. the smart powder of gained iron is poured into and is done to fall the phosphoric acid processing in the water extracter.
Described roe shape high-phosphorus hematite carry the iron method for reducing phosphorus, drop in the liming through the the smart powder of iron after 4., the residual phosphoric acid in the smart powder of iron is made neutralizing treatment.
Described roe shape high-phosphorus hematite carry the iron method for reducing phosphorus, acid solution is hydrochloric acid or sulfuric acid.
Described roe shape high-phosphorus hematite carry the iron method for reducing phosphorus, the phosphoric acid of gained and hydrochloric acid are done distillation and are handled, and obtain hydrogenchloride, phosphoric acid, hydrogen chloride gas is fed make hydrochloric acid in the water, and phosphoric acid is added lime, generate calcium phosphate precipitation.
Described roe shape high-phosphorus hematite carry the iron method for reducing phosphorus, reducing gas is CO.
Described roe shape high-phosphorus hematite carry the iron method for reducing phosphorus, the 3. stepping walk to few twice ball milling.
Described roe shape high-phosphorus hematite carry the iron method for reducing phosphorus, the granularity of crude iron powder is 0.053mm behind the ball milling.
Described roe shape high-phosphorus hematite carry the iron method for reducing phosphorus, the 2. the reducing gas in step be the coal gas that normal pressure makes at producer.
The present invention passes through roe shape high-phosphorus hematite under the reductive action of CO gas, make rhombohedral iron ore be reduced into metallic iron, under hot conditions, metallic iron is grown up to tens microns by diffusion aggregation simultaneously, by the fine grinding magnetic separation iron granule is separated with the phosphorated gangue again, residual carbamate additives for low phosphorus adopts hydrochloric acid or sulfuric acid to make the phosphorus dissolution process, reaches and puies forward the purpose that phosphorus falls in iron.Therefore, the present invention has found a valid approach for the exploitation of roe shape high-phosphorus hematite reasonable resources utilizes, and has improved rate of energy.
The present invention not only technology simple, to the quality of raw material and ore grain size require low, reduction process not consumed power and high-quality coke, energy consumption is low, and phosphorus rate and recovery rate of iron height fall, and can remove the phosphorus more than 90% in the iron ore, " concentrate " grade reaches more than 62%.
Embodiment
Below in conjunction with embodiment the present invention is elaborated.
Embodiment one: the falling of roe shape high-phosphorus hematite carried the iron method for reducing phosphorus and carried out according to the following steps:
1. choose phosphorous oolitic hematite material, its TFe〉42%, rhombohedral iron ore is crushed to particle diameter is not more than 0.25mm, breeze adds after sieving in the stoving oven, and stove internal heating fuel is combustion gas or fuel oil, and furnace atmosphere is a neutral atmosphere.
2. feed the reducing gas CO of capacity toward stoving oven, CO is by making in producer gas generator under the normal pressure, broken material revolves in multitube heat and carry out reduction reaction in the stoving oven under 900 ℃ condition, recovery time is 30min, make rhombohedral iron ore be reduced into metallic iron, at high temperature the metallic iron breeze is grown up to tens microns by diffusion aggregation.
3. the mineral after the reduction carry out magnetic separation after oxygen barrier is cooled to 80 ℃, the crude iron powder that obtains is made dispersion agent by the water glass that adds 1.25 kilograms per ton, water glass is commonly called as water glass, gained crude iron powder is carried out twice ball milling to particle diameter 0.053mm, iron granule and phosphorated gangue are separated through magnetic separation; It is to carry out the phosphorus dissolving in 5% the dilute hydrochloric acid that the smart powder of gained iron immerses weight percent at normal temperatures, and the time is 300 seconds, dilute hydrochloric acid and iron essence opaque amount ratio 2:1.
4. the smart powder of gained iron is poured into and is done in the water extracter to fall the phosphoric acid processing, gets smart iron powder.
5. drop in the liming through the the smart powder of iron after 4. and carry out neutralizing treatment, remove residual small amount of acid in the smart powder of iron.
6. the 5. go on foot the phosphoric acid of gained and hydrochloric acid and do distillation and handle, obtain hydrogenchloride and phosphoric acid, hydrogen chloride gas is fed make hydrochloric acid in the water, phosphoric acid is added lime, generate calcium phosphate precipitation.
" the multitube hot spiral-flow stoving oven " that the stoving oven of present embodiment can adopt the applicant to propose to State Intellectual Property Office in 2008.7.3, its application number is 200820120498.5; " a kind of magnetic force rotating centrifugal water extracter that selects iron ore " that water extracter can adopt the applicant to propose to State Intellectual Property Office in 2008.7.3, its application number is 200820120500.9.
Present embodiment technology is simple, raw materials quality is required low, reduction process not consumed power and high-quality coke, and energy consumption is low, can remove the phosphorus more than 90% in the iron ore, and the metallic iron that magnetic separation obtains reaches more than 62%.
Embodiment two: the falling of roe shape high-phosphorus hematite carried the iron method for reducing phosphorus and carried out according to the following steps:
1. choose quantitative phosphorous oolitic hematite material, its TFe〉40%, after the rhombohedral iron ore fragmentation and sieving, be pouring in the stoving oven of 0.12mm with particle diameter, stove internal heating fuel is combustion gas or fuel oil, furnace atmosphere is a neutral atmosphere.
2. feed the reducing gas CO of capacity toward stoving oven, broken material revolves in multitube heat and carry out reduction reaction in the stoving oven under 1400 ℃ condition, recovery time is 58min, makes rhombohedral iron ore be reduced into metallic iron, and at high temperature the metallic iron breeze is grown up to tens microns by diffusion aggregation.
3. the mineral after the reduction carry out magnetic separation after oxygen barrier is cooled to 20 ℃, the crude iron powder that obtains is made dispersion agent by the water glass that adds 1.4 kilograms per ton, water glass is commonly called as water glass, gained crude iron powder is carried out twice ball milling to particle diameter 0.044mm, iron granule and phosphorated gangue are separated through magnetic separation; It is to carry out the phosphorus dissolving in 16% the hydrochloric acid that the smart powder of gained iron immerses weight percent at normal temperatures, and the time is 50 seconds, the ratio 1:0.7 of dilute hydrochloric acid and iron essence powder.
4. the smart powder of gained iron is poured into and is done in the water extracter to fall the phosphoric acid processing, gets smart iron powder.
Embodiment three: the falling of roe shape high-phosphorus hematite carried the iron method for reducing phosphorus and carried out according to the following steps:
1. choosing quantitative phosphorous oolitic hematite material, after the rhombohedral iron ore fragmentation and sieving, is pouring in the stoving oven of 0.24mm with particle diameter, and stove internal heating fuel is combustion gas, and furnace atmosphere is a neutral atmosphere.
2. feed the reducing gas CO of capacity toward stoving oven, broken material revolves in multitube heat and carry out reduction reaction in the stoving oven under 830 ℃ condition, recovery time is 45min, makes rhombohedral iron ore be reduced into metallic iron, and at high temperature the metallic iron breeze is grown up to tens microns by diffusion aggregation.
3. the mineral after the reduction carry out magnetic separation after oxygen barrier is cooled to 50 ℃, the crude iron powder that obtains is made dispersion agent by the water glass that adds 1.1 kilograms per ton, water glass is commonly called as water glass, gained crude iron powder is carried out twice ball milling to particle diameter 0.01mm, iron granule and phosphorated gangue are separated through magnetic separation; It is to carry out the phosphorus dissolving in 1.5% the sulfuric acid that the smart powder of gained iron immerses weight percent at normal temperatures, and the time is 260 seconds, the ratio 2:1 of dilute sulphuric acid and iron essence powder.
4. the smart powder of gained iron is poured into and is done in the water extracter to fall the phosphoric acid processing, gets smart iron powder.
Those skilled in the art will be appreciated that; above embodiment is used for illustrating the present invention; and be not as limitation of the invention, as long as in essential scope of the present invention, all will fall within protection scope of the present invention variation, the modification of above embodiment.
Claims (8)
1, roe shape high-phosphorus hematite carry the iron method for reducing phosphorus, it is characterized in that carrying out according to the following steps:
1. after phosphorous oolitic hematite being crushed to particle diameter and being not more than 0.25mm, add in the stoving oven;
2. feed the reducing gas of capacity toward stoving oven reduction chamber, broken material carries out abundant reduction reaction under 700-1450 ℃ condition in stoving oven, and the recovery time is 10-60min;
3. the reduction after mineral through oxygen barrier be cooled to be not more than 100 ℃ after magnetic separation, the crude iron powder that obtains is made ball milling behind the dispersion agent by the water glass of adding per ton 1-1.5 kilogram, the gained crude iron sphere of powder is milled to particle diameter is not more than 0.055mm, the smart powder of gained iron immerses at normal temperatures and carries out the phosphorus dissolving in the acid solution that weight percent is 0.5%-18%, time is 30-300 second, and the ratio of the smart powder of acid solution and iron is not less than 1:1;
4. the smart powder of gained iron is poured into and is done to fall the phosphoric acid processing in the water extracter.
2, roe shape high-phosphorus hematite as claimed in claim 1 carry the iron method for reducing phosphorus, it is characterized in that: drop in the liming through the the smart powder of iron after 4., the residual phosphoric acid in the smart powder of iron is made neutralizing treatment.
3, roe shape high-phosphorus hematite as claimed in claim 1 carry the iron method for reducing phosphorus, it is characterized in that: described acid solution is hydrochloric acid or sulfuric acid.
4, roe shape high-phosphorus hematite as claimed in claim 3 carries the iron method for reducing phosphorus, it is characterized in that: the phosphoric acid of gained and hydrochloric acid are done distillation and are handled, and obtain hydrogenchloride, phosphoric acid, hydrogen chloride gas is fed make hydrochloric acid in the water, phosphoric acid is added lime, generate calcium phosphate precipitation.
5, roe shape high-phosphorus hematite as claimed in claim 1 carry the iron method for reducing phosphorus, it is characterized in that: described reducing gas is CO.
6, roe shape high-phosphorus hematite as claimed in claim 1 carry the iron method for reducing phosphorus, it is characterized in that: the 3. stepping walk to few twice ball milling.
7, roe shape high-phosphorus hematite as claimed in claim 6 carry the iron method for reducing phosphorus, it is characterized in that: the granularity of crude iron powder is 0.053mm behind the ball milling.
8, roe shape high-phosphorus hematite as claimed in claim 1 carry the iron method for reducing phosphorus, it is characterized in that: the 2. the reducing gas in step be the coal gas that normal pressure makes at producer.
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| CN2008101633932A CN101440416B (en) | 2008-12-18 | 2008-12-18 | Iron increase and phosphorous reduction method for oolitic high phosphorus hematite |
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| CN2008101633932A CN101440416B (en) | 2008-12-18 | 2008-12-18 | Iron increase and phosphorous reduction method for oolitic high phosphorus hematite |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101824529A (en) * | 2010-04-02 | 2010-09-08 | 南昌大学 | Method for removing phosphorus from svanbergite-containing high phosphorus iron ore |
| CN103509935A (en) * | 2013-10-22 | 2014-01-15 | 化工部长沙设计研究院 | Production process for improving iron content and reducing phosphorus content in low-grade high-phosphorus oolitic hematite |
| CN105689126A (en) * | 2016-05-11 | 2016-06-22 | 河北省地矿中心实验室 | Mineral processing process for oolitic hematite |
| CN110479485A (en) * | 2019-09-20 | 2019-11-22 | 鞍钢集团矿业有限公司 | A method of it improving magnetic force dehydration slot and sorting index is concentrated |
| CN113042201A (en) * | 2021-03-30 | 2021-06-29 | 酒泉钢铁(集团)有限责任公司 | Iron-extracting and phosphorus-removing process for high-phosphorus hematite |
-
2008
- 2008-12-18 CN CN2008101633932A patent/CN101440416B/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101824529A (en) * | 2010-04-02 | 2010-09-08 | 南昌大学 | Method for removing phosphorus from svanbergite-containing high phosphorus iron ore |
| CN103509935A (en) * | 2013-10-22 | 2014-01-15 | 化工部长沙设计研究院 | Production process for improving iron content and reducing phosphorus content in low-grade high-phosphorus oolitic hematite |
| CN105689126A (en) * | 2016-05-11 | 2016-06-22 | 河北省地矿中心实验室 | Mineral processing process for oolitic hematite |
| CN105689126B (en) * | 2016-05-11 | 2018-01-09 | 河北省地矿中心实验室 | A kind of oolitic hematite ore-dressing technique |
| CN110479485A (en) * | 2019-09-20 | 2019-11-22 | 鞍钢集团矿业有限公司 | A method of it improving magnetic force dehydration slot and sorting index is concentrated |
| CN113042201A (en) * | 2021-03-30 | 2021-06-29 | 酒泉钢铁(集团)有限责任公司 | Iron-extracting and phosphorus-removing process for high-phosphorus hematite |
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| CN101440416B (en) | 2010-09-15 |
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Granted publication date: 20100915 Termination date: 20121218 |