CN101643806A - Method for producing molten iron with high-phosphorus and low-iron refractory iron ore - Google Patents
Method for producing molten iron with high-phosphorus and low-iron refractory iron ore Download PDFInfo
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- CN101643806A CN101643806A CN200910094899A CN200910094899A CN101643806A CN 101643806 A CN101643806 A CN 101643806A CN 200910094899 A CN200910094899 A CN 200910094899A CN 200910094899 A CN200910094899 A CN 200910094899A CN 101643806 A CN101643806 A CN 101643806A
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Abstract
The invention provides a method for producing molten iron with high-phosphorus and low-iron refractory iron ore, comprising the following steps: taking high-phosphorus and low-iron refractory iron oreas raw material; taking wood coal as reducing agent; oxidizing roasting; directly reducing; magnetically separating and separating; melting and separating; dephosphorizing molten iron; and obtainingthe low-phosphorus molten iron. The method can process the extremely refractory iron ore with high P content, high S content, high SiO2 content and low iron level, has high ore iron recovery rate, completely solves the difficulties of the high-phosphorus and low-iron refractory iron ore such as ore selecting and smelting, removing coke, and eliminating high-energy consumption and high-pollution technical process such as ore selecting, sintering, palletizing, coking, etc. Phosphorus-containing slag can realize resource comprehensive utilization. A great number of experiments and semi-industrialproduction demonstrate that the technical economic effect of the method is remarkable and effectively solves the current problem of ore resources supply-demand contradiction in China.
Description
Technical field
The present invention relates to a kind of method of producing molten iron, belong to the ore smelting technical field with the low iron refractory iron ore of high phosphorus.
Background technology
China is an Iron And Steel Industry big country, after iron and steel output in 1996 surpasses hundred million tons, occupies first place, the world always, and output of steel reached record-breaking 500,000,000 tons in 2008, and the raising of output drives the mass consumption of raw material.Though domestic in recent years iron ore production has certain development, its speedup is far below the speedup of iron and steel output, and domestic iron ore is supplied with long-term not enough, and the external dependency degree of iron ore constantly increases.Yet the price of the iron ore of import high-quality in recent years rises steadily, and causes the contradiction of China's Iron And Steel Industry raw materials for production shortage to become increasingly conspicuous, and this situation has restricted the sound development of China's Iron And Steel Industry.
In the explored iron ore deposit of China, the low iron refractory iron ore of high phosphorus is widely distributed, reserves reach billions of tons, and very big potentiality to be exploited is arranged.But the mineral composition of the low iron refractory iron ore of high phosphorus is comparatively complicated, the tight symbiosis of multi mineral, mix distribution, disseminated grain size is superfine, and comprehensive iron grade is lower, only about 30%, harmful element such as S, P content is very high, and wherein S content is 0.30～1.29%, and P content is 0.92～1.31%, therefore, extremely difficulty sorts.Special complicacy for the low iron refractory iron ore of high phosphorus, since the seventies in 20th century, successively there are how tame scientific research institutions that it was carried out beneficiation test research, but its index is all undesirable, and the comprehensive iron concentrate grade of gained does not all reach 56%, and recovery rate in ore-dressing is low, S, P content still remain on higher level, unreasonable economically in addition, industrial production is difficult to use, and does not therefore obtain exploitation so far.Therefore, research and develop a kind of can on ore dressing, metallurgical technology, haveing breakthrough, billions of tons the poor iron ore of high phosphorus is fully used, for the development of China's Iron And Steel Industry provides a large amount of ore resource, to alleviate novel process, the new technology of China's iron ore deposit imbalance between supply and demand, be one of current of paramount importance approach.
Domestic development and use to iron ore of low ore grade at present mainly concentrate on the improvement of ore-dressing technique and equipment thereof, and smelt in the Research on New exploitation.As utilize dry magnetic separation technology can successfully reclaim the magnetite of grade about 33.35%; Utilizing the mill ore magnetic selection method can also handle the iron grade only is 9.71% poor iron ore.The iron ore of selecting with these technology all has grindability index and ore dressing separation property preferably, and harmful element such as the single not sulfur-bearing of composition phosphorus.But select low grade ore for complicated component, disseminated grain size is superfine and phosphorus content is very high difficulty, then be difficult to be suitable for.More domestic units carried out the research of coal-based direct reduction-fine grinding magnetic separation process at the low-grade refractory iron ore, its the finished product are metallized briquette, but its used composition of ores is single and do not contain higher elements such as sulphur phosphorus, but does not see below continuous report and application.At high-phosphorus iron ore, part unit once carried out the research of dephosphorizing technology at the laboratory using chemical agent to it, but did not see sizable application and follow-up work report.
Abroad, the high-quality ore resource abundance of invar iron enterprise, resource pressure is lighter relatively, and is less to the development and use situation of low grade ore, but experience for reference is few.
Therefore characteristics such as mineral composition complexity, the tight symbiosis of various mineral, superfine, the comprehensive grade of disseminated grain size are low because the low iron refractory iron ore of high phosphorus has, phosphorus sulphur content height, up to the present yet there are no the effective treatment process and the report of method.
Summary of the invention
The object of the present invention is to provide a kind of method of producing molten iron, make the low iron refractory ore of high phosphorus obtain fully effectively utilizing, to solve the problem of the current iron ore deposit imbalance between supply and demand of China with the low iron refractory iron ore of high phosphorus.
The present invention realizes by following technical proposal: a kind of method of utilizing the low iron refractory iron ore of high phosphorus to produce molten iron, it is characterized in that with the low iron refractory ore of high phosphorus be raw material, and brown coal are reductive agent, and through following process steps:
A, ore that exploitation is come out are put into stoving oven with ore after conventional fragmentation, be under 950～1100 ℃ of conditions in temperature, oxidizing roasting 1～1.5h, the oxidizing roasting mineral;
B, in A step gained oxidizing roasting mineral, with addition of 25～40% carbon of oxidizing roasting mineral quality, send in the direct reduction furnace, be under 1050～1100 ℃ of conditions in temperature, directly reduce 1.5～2h, direct-reduced iron;
C, with B step gained direct-reduced iron after conventional fragmentation, magnetic separation separates with method with conventional magnetic plant, sponge iron and impurity;
D, C step magnetic separation gained sponge iron is sent in the smelting furnace, under 1400 ℃～1550 ℃ temperature condition, be melted to and isolate molten iron and slag;
E, in D step gained molten iron, press molten iron: the mass ratio of dephosphorizing agent=100: 15～25 adds the following dephosphorizing agent of being made up of the component of mass percent:
CaO 30～50％
SiO
2 5～10％
FeO 10～20％
Fe
2O
3 20～40％
Al
2O
3 5～12％
CaF
2 3～10％；
F, be dephosphorization under 1350 ℃～1450 ℃ conditions in temperature, low-phosphorous molten iron.
The stoving oven of described A step is a conventional oxidizing roasting stove of the prior art.
The direct reduction furnace of described B step is a conventional reduction stove of the prior art, perhaps is conventional directly reduction tunnel furnace.
The smelting furnace of described D step is a conventional electric furnace of the prior art.
The selection of each component and quality percentage composition will specifically be determined according to the slag after whether staying slag and staying what, fusing of slag to separate and the composition of molten iron in the dephosphorizing agent of described E step, to satisfy the molten steel quality requirement.
The concrete add-on of the dephosphorizing agent of described E step is looked the requirement of hot metal composition and final molten iron phosphorus content and is determined, to satisfy the molten steel quality requirement.
Key problem in technology of the present invention is:
(1) strict controlled oxidation roasting system: to the low iron refractory iron ore of high phosphorus, its oxidizing roasting temperature should be controlled at 980～1030 ℃, and the time is at 1～1.5h.
(2) strict control coal-based direct reduction system: to the low iron refractory iron ore of high phosphorus, its direct reduction temperature should be controlled at 1050～1100 ℃, and the time, mixed carbon comtent should be at 25%～40% of ore quality at 1.5～2h.
Adopt method of the present invention can reach following several objects, that is: ore can carry out good desulfurization and part dephosphorization (1) oxidizing roasting stage, and improves the reductibility of ore; (2) the coal-based direct reduction stage, except that obtaining reductive sponge iron product, also can remove part phosphorus wherein; (3) adopt easy magnetic plant and method to isolate direct reductive sponge iron product, and the gangue that is mingled with in remaining coal dust, ash and the sponge iron; (4) directly reducing sponge iron is isolated gangue through fusing, obtains phosphorous molten iron, more phosphorous molten iron is carried out liquid dephosphorization, desulfurization after, obtain the molten iron that touches the mark.
Adopt and of the present inventionly produce molten iron with the low iron refractory iron ore of high phosphorus, its technology has following advantage:
(1) can handle high P, high S, high SiO
2The utmost point refractory iron ore of content and low iron grade, direct production goes out satisfactory low-phosphorous molten iron;
(2) ore iron recovery height has thoroughly solved ore dressing, a smelting difficult problem that high phosphorus hangs down the iron refractory iron ore;
(3) without coke, saved high energy consumption, high pollution technological processs such as ore dressing, sintering, pelletizing and coking, phosphorus bearing slag can be realized comprehensive utilization of resources, is a kind of new process of green clean environment firendly.
In a word, the present invention can directly apply to the development and use of the low iron refractory iron ore of domestic high phosphorus, obtains low-phosphorous molten iron, by a large amount of experiments and half industrialness production, prove that its techno-economic effect is remarkable, efficiently solve the problem of the current iron ore deposit imbalance between supply and demand of China.
Embodiment
The present invention will be further described below in conjunction with embodiment.
Embodiment 1
With the low iron refractory iron ore of high phosphorus is raw material, and near the brown coal the mining area are made reductive agent, and wherein the ore chemistry composition is: TFe:34.7%, S:0.304%, P:1.01%, FeO:2.68%, Fe
2O
3: 46.60%, SiO
2: 29.84%, TiO
2: 0.20%, AL
2O
3: 2.89%, CaO:1.32%, MgO:0.35%, MnO:3.68%, K
2O:0.11%, Ig:11.01%, the process following process steps:
A, with above-mentioned ore with jaw crushing crusher machine of the prior art after, ore is put into stoving oven, in temperature is under 980 ℃ of conditions, and oxidizing roasting 1.5h gets the oxidizing roasting mineral, this mineral main chemical compositions is: TFe:38.6%, P:0.970%, S:0.064%, desulfurization degree 78.95%, dephosphorization rate 3.96%, ore loss ratio are 11.30%;
B, in A step gained oxidizing roasting mineral, 35% carbon with addition of the oxidizing roasting mineral quality, sending in the direct reduction furnace, is under 1060 ℃ of conditions in temperature, carries out coal-based direct reduction 2h, get direct-reduced iron, its main chemical compositions is: MFe:44.7%, P:0.909%, S:0.075%, dephosphorization rate 24.28%, reduced iron degree of metalization are 86.13%;
C, with B step gained direct-reduced iron behind the jaw crushing crusher machine, magnetic separator with routine, in magneticstrength is under 2000 Gauss's conditions, carrying out magnetic separation separates, get sponge iron and impurity, impurity levels such as wherein isolated carbon residue, ash and gangue are 27.38%, and the direct-reduced iron amount is 72.62%;
D, C step magnetic separation gained sponge iron is sent in the electric furnace, be melted under 1400 ℃ of temperature and isolate molten iron and slag, its slag weight of iron ratio is 1.18: 1, claws slag;
E, in the molten iron of D step, press dephosphorizing agent: the mass ratio of molten iron=15: 100, drop into the dephosphorizing agent of forming by following component: 30%CaO, 5%SiO
2, 10%FeO, 33%Fe
2O
3, 12%Al
2O
3And 10%CaF
2, after carrying out dephosphorization under 1350 ℃ of temperature, obtain the qualified molten iron of [P]＜0.1%, [C]=2.32%, dephosphorization rate＞92%.
Embodiment 2
With the low iron refractory iron ore of high phosphorus is raw material, and near the brown coal the mining area are made reductive agent, and wherein the ore chemistry composition is: TFe:31.19%, S:1.35%, P:1.05%, FeO:29.01%, Fe
2O
3: 12.35%, SiO
2: 25.53%, TiO
2: 0.16%, AL
2O
3: 3.39%, CaO:3.89%, MgO:1.75%, MnO:2.07%, K
2O:0.17%, Ig:18.99%, the process following process steps:
A, with above-mentioned ore with jaw crushing crusher machine of the prior art after, ore is put into stoving oven, in temperature is under 1000 ℃ of conditions, and oxidizing roasting 1h gets the oxidizing roasting mineral, the main chemical compositions of these mineral is: TFe:37.4%, P:1.03%, S:0.2%, desulfurization degree 85.18%, dephosphorization rate 1.9%, ore loss ratio are 17.5%;
B, in A step gained oxidizing roasting mineral, 40% carbon with addition of the oxidizing roasting mineral quality, sending in the direct reduction furnace, is under 1100 ℃ of conditions in temperature, carries out coal-based direct reduction 1.5h, get direct-reduced iron, its main chemical compositions is: MFe:42.13%, P:1.3%, S:0.24%, dephosphorization rate 21.29%, reduced iron degree of metalization are 89.83%;
C, with B step gained direct-reduced iron behind the jaw crushing crusher machine, magnetic separator with routine, in magneticstrength is under 2000 Gauss's conditions, carrying out magnetic separation separates, get sponge iron and impurity, impurity levels such as wherein isolated carbon residue, ash and gangue are 26.5%, and the direct-reduced iron amount is 73.5%;
D, C step gained sponge iron is sent in the electric furnace, be melted under 1550 ℃ of temperature and isolate molten iron and slag, its slag iron is 1.21: 1 than (quality), claws slag;
E, in the molten iron of D step, press dephosphorizing agent: the mass ratio of molten iron=25: 100, drop into the dephosphorizing agent of forming by following component: 35%CaO, 8%SiO
2, 15%FeO, 32%Fe
2O
3, 10%Al
2O
3And 5%CaF
2, after carrying out dephosphorization under 1400 ℃ of temperature, obtain the qualified molten iron of [P]＜0.1%, [C]=2.32%, dephosphorization rate＞92%.
Embodiment 3
With the low iron refractory iron ore of Huimin Prefecture, Yunnan Province high phosphorus is raw material, and near the brown coal the mining area are made reductive agent, and wherein the ore chemistry composition is: TFe:45.28%, S:0.036%, P:1.05%, FeO:2.05%, Fe
2O
3: 62.41%, SiO
2: 15.28%, AL
2O
3: 5.08%, CaO:0.03%, MgO:0.08%, MnO:2.00%, K
2O:0.16%, Ig:10.81%, the process following process steps:
A, with above-mentioned ore with jaw crushing crusher machine of the prior art after, ore is put into stoving oven, in temperature is under 1030 ℃ of conditions, and oxidizing roasting 1.3h gets the oxidizing roasting mineral, the main chemical compositions of these mineral is: TFe:52.60%, P:0.91%, S:0.02%, desulfurization degree 41.66%, dephosphorization rate 13.52%, ore loss ratio are 15.20%;
B, in A step gained oxidizing roasting mineral, 25% carbon with addition of the oxidizing roasting mineral quality, send in the direct reduction furnace, in temperature is under 1080 ℃ of conditions, carry out coal-based direct reduction 1.8h, get direct-reduced iron, its main chemical compositions is: MFe:63.27%, P:1.03%, reduced iron degree of metalization are 91.96%;
C, with B step gained direct-reduced iron behind the jaw crushing crusher machine, magnetic separator with routine, in magneticstrength is under 2000 Gauss's conditions, carrying out magnetic separation separates, get sponge iron and impurity, impurity levels such as wherein isolated carbon residue, ash and gangue are 18.14%, and the direct-reduced iron amount is 81.86%;
D, C step gained sponge iron is sent in the electric furnace, be melted under 1500 ℃ of temperature and isolate molten iron and slag, its slag iron is 0.56: 1 than (quality), claws slag;
E, in the molten iron of D step, press dephosphorizing agent: the mass ratio of molten iron=20: 100, drop into the dephosphorizing agent of forming by following component: 40%CaO, 10%FeO, 10%SiO
2, 30%Fe
2O
3, 5%Al
2O
3And 5%CaF
2, after carrying out dephosphorization under 1450 ℃ of temperature, obtain the qualified molten iron of [P]＜0.1%, [C]=2.32%, dephosphorization rate＞92%.
Claims (3)
1, a kind of method of utilizing the low iron refractory iron ore of high phosphorus to produce molten iron is characterized in that with the low iron refractory ore of high phosphorus be raw material, and brown coal are reductive agent, and through following process steps:
A, ore that exploitation is come out are put into stoving oven with ore after conventional fragmentation, be under 950～1100 ℃ of conditions in temperature, oxidizing roasting 1～1.5h, the oxidizing roasting mineral;
B, in A step gained oxidizing roasting mineral, with addition of 25～40% carbon of oxidizing roasting mineral quality, send in the direct reduction furnace, be under 1050～1100 ℃ of conditions in temperature, directly reduce 1.5～2h, direct-reduced iron;
C, with B step gained direct-reduced iron after conventional fragmentation, magnetic separation separates with method with conventional magnetic plant, sponge iron and impurity;
D, C step magnetic separation gained sponge iron is sent in the smelting furnace, under 1400 ℃～1550 ℃ temperature condition, be melted to and isolate molten iron and slag;
E, in D step gained molten iron, press molten iron: the mass ratio of dephosphorizing agent=100: 15～25 adds the following dephosphorizing agent of being made up of the component of mass percent:
CaO 30～50％
SiO
2 5～10％
FeO 10～20％
Fe
2O
3 20～40％
Al
2O
3 5～12％
CaF
2 3～10％；
F, be dephosphorization under 1350 ℃～1450 ℃ conditions in temperature, low-phosphorous molten iron.
2, the method for utilizing the low iron refractory iron ore of high phosphorus to produce molten iron as claimed in claim 1, it is characterized in that the selection of each component in the dephosphorizing agent of described E step and quality percentage composition will specifically determine according to the slag after whether staying slag and staying what, fusing of slag to separate and the composition of molten iron, to satisfy the molten steel quality requirement.
3, the method for utilizing the low iron refractory iron ore of high phosphorus to produce molten iron as claimed in claim 1, the concrete add-on that it is characterized in that the dephosphorizing agent of described E step are looked the requirement of hot metal composition and final molten iron phosphorus content and are determined, to satisfy the molten steel quality requirement.
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|---|---|---|---|
| CN2009100948997A CN101643806B (en) | 2009-08-28 | 2009-08-28 | Method for producing molten iron with high-phosphorus and low-iron refractory iron ore |
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| CN101643806B CN101643806B (en) | 2011-04-06 |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101914648A (en) * | 2010-07-27 | 2010-12-15 | 昆明理工大学 | Method for producing low-phosphorus molten iron by utilizing oxygen-enriched top blown to carry out melting reduction on high-phosphorus iron ore |
| CN102912111A (en) * | 2012-09-12 | 2013-02-06 | 北京矿冶研究总院 | Treatment method of oolitic hematite containing phosphorus |
| CN104212929A (en) * | 2014-08-19 | 2014-12-17 | 北京神雾环境能源科技集团股份有限公司 | Iron making method for treating high-phosphorus ore through direct reduction of gas-based shaft furnace and magnetic separation |
| CN104313229A (en) * | 2014-10-30 | 2015-01-28 | 武汉钢铁(集团)公司 | Method for manufacturing high-phosphorus iron by using shaft furnace to directly reduce high phosphorus ore |
| CN106755970A (en) * | 2016-12-16 | 2017-05-31 | 江苏省冶金设计院有限公司 | A kind of method of phosphorus ore reducting pellet dephosphorization high |
| CN107893141A (en) * | 2017-11-15 | 2018-04-10 | 东北大学 | Casting full-flow process is smelted in a kind of Refractory iron ore stone prereduction |
| CN108034785A (en) * | 2017-12-18 | 2018-05-15 | 东北大学 | A kind of Refractory iron ore prereduction-restore the method for producing molten iron |
| CN116024427A (en) * | 2023-01-04 | 2023-04-28 | 长沙氢冶钢铁科技有限公司 | Method for preparing low-phosphorus molten iron based on high-temperature melting of high-phosphorus iron ore metallization product |
-
2009
- 2009-08-28 CN CN2009100948997A patent/CN101643806B/en not_active Expired - Fee Related
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101914648A (en) * | 2010-07-27 | 2010-12-15 | 昆明理工大学 | Method for producing low-phosphorus molten iron by utilizing oxygen-enriched top blown to carry out melting reduction on high-phosphorus iron ore |
| CN102912111A (en) * | 2012-09-12 | 2013-02-06 | 北京矿冶研究总院 | Treatment method of oolitic hematite containing phosphorus |
| CN102912111B (en) * | 2012-09-12 | 2015-01-07 | 北京矿冶研究总院 | Treatment method of oolitic hematite containing phosphorus |
| CN104212929A (en) * | 2014-08-19 | 2014-12-17 | 北京神雾环境能源科技集团股份有限公司 | Iron making method for treating high-phosphorus ore through direct reduction of gas-based shaft furnace and magnetic separation |
| CN104212929B (en) * | 2014-08-19 | 2016-06-22 | 北京神雾环境能源科技集团股份有限公司 | The iron smelting method of gas-based shaft kiln directly reduced-magnetic separation separating treatment height phosphorus ore |
| CN104313229A (en) * | 2014-10-30 | 2015-01-28 | 武汉钢铁(集团)公司 | Method for manufacturing high-phosphorus iron by using shaft furnace to directly reduce high phosphorus ore |
| CN104313229B (en) * | 2014-10-30 | 2016-08-24 | 武汉钢铁(集团)公司 | The method producing high ferrophosphorus with shaft kiln directly reduced high phosphorus ore |
| CN106755970A (en) * | 2016-12-16 | 2017-05-31 | 江苏省冶金设计院有限公司 | A kind of method of phosphorus ore reducting pellet dephosphorization high |
| CN107893141A (en) * | 2017-11-15 | 2018-04-10 | 东北大学 | Casting full-flow process is smelted in a kind of Refractory iron ore stone prereduction |
| CN108034785A (en) * | 2017-12-18 | 2018-05-15 | 东北大学 | A kind of Refractory iron ore prereduction-restore the method for producing molten iron |
| CN116024427A (en) * | 2023-01-04 | 2023-04-28 | 长沙氢冶钢铁科技有限公司 | Method for preparing low-phosphorus molten iron based on high-temperature melting of high-phosphorus iron ore metallization product |
| CN116024427B (en) * | 2023-01-04 | 2023-09-12 | 长沙氢冶钢铁科技有限公司 | Method for preparing low-phosphorus molten iron based on high-temperature melting of high-phosphorus iron ore metallization product |
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| CN101643806B (en) | 2011-04-06 |
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