CN1285738C - Preprocessing agent for molten iron and method for preparing same - Google Patents
Preprocessing agent for molten iron and method for preparing same Download PDFInfo
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- CN1285738C CN1285738C CN 200410013065 CN200410013065A CN1285738C CN 1285738 C CN1285738 C CN 1285738C CN 200410013065 CN200410013065 CN 200410013065 CN 200410013065 A CN200410013065 A CN 200410013065A CN 1285738 C CN1285738 C CN 1285738C
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- red mud
- cao
- hot metal
- metal pretreatment
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Abstract
The present invention relates to a producing method of using red mud as a molten iron pretreating agent, which has the technical scheme that 15 wt% to 30 wt% of red mud are mixed with 38 wt% to 45 wt% of Fe2O3, 25 wt% to 40 wt% of CaO, not more than 5 wt% of Na2CO3, not more than 5 wt% of MnO2, not more than 5 wt% of CaCl2 and not more than 10 wt% of SiO2 after being dried, and the CaO/SiO2 in mixture compositions is from 3.0 to 7.0. The used red mud is required to have the main chemical components of not less than 25 wt% of SiO2, not less than 20 wt% of Fe2O3 or not less than 40 wt% of CaO. The producing method uses the red mud as a raw material and has the characteristics of waste utilization, resource recovery, clean production, environmental protection and low price without the need of changing the present molten iron pretreating equipment and operation.
Description
One, technical field
The invention belongs to the production method of hot metal pretreatment agent.Relate in particular to a kind of with the production method of red mud as the hot metal pretreatment agent.
Two, background technology
Red mud is to extract the waste that produces in the alumina process with bauxite ore.The annual red mud of producing in the whole world is about more than 6,000 ten thousand tons at present.Domestic aluminum oxide output was about about 5,500,000 tons in 2003, and the red mud amount of year discharge should add aggregate value method of weighting storage over the years more than 6,000,000 tons, and its quantity is considerable.A large amount of red muds not only will take the soil, good farmland, and free alkali and other objectionable constituent are contaminate environment also.Alumina producer generally adopts the level land to build platform, the river valley ponding, and methods such as lowland filling are stored up red mud, owing to do not take safeguard procedures, 200～700 meters in red mud waste liquid polluted underground water source is dark, and this water source, ground is forever alkalized.
In recent years, both at home and abroad the metallargist utilizes the stockpiling and storing of red mud, processing and Aluminum waste residue again and did number of research projects.Have in the application facet main direction of studying: (1) utilizes red mud to prepare fine direct-reduced iron agglomerate, as Electric furnace steel making raw material (Luo Daocheng, Liu Junfeng, Yi Pinggui, Chen Anguo. the novel process of red mud for alumina plant comprehensive utilization. Chinese Mining Industry, 2002 the 11st volume the 5th phase 50-53); (2) utilize red mud produce cement (in strong, Jia Yuanping, Zhu Shouhe. utilize aluminium industrial residue (red mud) to produce cement. cement works, 1999 06 phases, 34-36); (3) road-making material (pay firm. solidify red mud and prepare the experimental study of advanced road material technology. non-ferrous metal, 02 phase of calendar year 2001,11-13); (4) utilize red mud do mine packing material, calcium silicate fertilizer etc. (Liang Hua. the recent research that red mud utilizes is dynamic. world's non-ferrous metal, 1999 the 3rd phase 32-34).More than research does not have red mud as the hot metal pretreatment agent, effective constituent in the red mud is not made full use of, and the red mud amount that is consumed far can not be dealt with growing red mud quantum of output.
On the other hand, be badly in need of efficient cheap desiliconization, dephosphorization and sweetening agent in hot metal pretreatment and the steelmaking process.Hot metal pretreatment refers to that molten iron is the treating processes of removing some objectionable constituent or reclaiming some valuable constituent before entering steel melting furnace.Hot metal pretreatment specifically be called the outer desiliconization of molten iron stove (pay rich, Zhang Jie etc. the effect research of solid desiliconization agent. steel-making, 2002,18 (No.4), 36-39), external desulfurization of hot metal, (Wu Baoguo, Dong Yuanchi, Wang Haichuan, Zhou Yun, Wang Shijun. the progress of external desulfurization of hot metal agent. southern metal, 2003, No.3,14-16,23); The molten iron extra furnace dephosphorization (Le Kexiang, Wang Shijun, Wang Haichuan, Gong Zhizuo, Liu Xinlong, Sun Shusen. CaO-Fe in hot metal pretreatment
2O
3-CaF
2The discussion of original washing powder agent dephosphorization technology and influence factor. iron and steel, Vol.37, No.7,2002,20-22,32), sometimes desulfurization, dephosphorization can carry out simultaneously (Wang Qingxiang, Chen Danfeng. do fusing agent additive carries out dephosphorization and desulfurization simultaneously to molten iron research with soda. steel-making, 1998 the 6th phase 31-34).For middle and high ferrophosphorus water or the molten iron that has comprehensive utilization of resources to be worth, as must carrying out under oxidizing atmosphere the hot metal pretreatment that contains vanadium, niobium, titanium, required pretreating agent will have certain oxidisability and high basicity.Because the high-carbon content in the molten iron has limited the raising of actual oxygen position in the system, the basicity and affinability, the consumption of minimizing pulvis that improve slag are metallargist's long-term struggle targets.At present, hot metal pretreatment is mainly carried out in torpedo car or hot metal ladle, the pretreating agent that uses be artificial synthetic flux (Yang Yindong, Bi Xuegong, Hou Jian etc. utilize Aluminum waste residue and co-production Iron And Steel Industry refined synthetic slag. iron and steel, Vol.38, No.10,2003, (supplementary issue), 208～212), but not useful red mud is a raw material.
Three, summary of the invention
Task of the present invention provide a kind of need not to change existing hot metal pretreatment equipment and operation, cheap, can utilization of waste material, resource recovery, cleaner production, protection environment be hot metal pretreatment agent of raw material, dephosphorization, desulfurization, desiliconization effectively and preparation method thereof with the production red mud that aluminum oxide produced.
For realizing above-mentioned task, the technical solution adopted in the present invention is with red mud oven dry back and Fe
2O
3, CaO, Na
2CO
3, MnO
2, CaCl
2, SiO
2Or other metallurgical wastes that contain these compositions carry out mix grinding.
The quality percentage composition of each component is in the mixture: red mud is 15～30%, Fe
2O
3Be 38～45%, CaO is 25～40%, Na
2CO
3≤ 5%, MnO
2≤ 5%, CaCl
2≤ 5%, SiO
2≤ 1O%.CaO/SiO during mixture is formed
2Be 3.0～7.0.
Wherein, the quality percentage composition of the main chemical compositions of used red mud is: SiO
2≤ 25%, Fe
2O
3〉=20% or CaO 〉=40%.
Preparation of the present invention is earlier red mud to be dried, and presses the mass percent mixing of said mixture, and being milled to granularity then is below 120 orders, can be as the desiliconization agent or the dephosphorization and desulfurization agent of hot metal pretreatment.
Because adopt above-mentioned technology, the present invention has following characteristics:
1, the present invention can give full play to basic oxide CaO, the K in the red mud
2O and Na
2The effect of O, dephosphorization, desulfurization, desiliconization effectively in the hot metal pretreatment process;
2, the present invention Fe in utilizing red mud
2O
3When carrying out hot metal pretreatment as oxygenant, the iron in the recyclable red mud, general red mud utilize method to utilizing a spot of Fe in the red mud
2O
3Economically with technical all powerless;
3, the present invention is not suitable for adopting beneficiation method to produce iron-smelting raw material, be not suitable for directly all can effectively utilizing as the red mud of industrial raw material such as siliceous fertilizer, cement for those chemical ingredientss;
4, the present invention need not to change existing hot metal pretreatment equipment and operation, both can save facility investment and staff training expense, can improve the molten steel purity again, improves the quality of steel.
5, to adopt and produce the red mud that aluminum oxide produced be raw material in the present invention, but utilization of waste material, resource recovery, cleaner production, protection environment and cheap.
Four, embodiment
Produce aluminum oxide at present and mainly contain two kinds of technologies, sintering process and Bayer process.The red mud that sintering process produces contains higher calcium oxide and silicon-dioxide, and mineral composition is based on Dicalcium Phosphate (Feed Grade), and ferric oxide and sodium oxide content are lower in the red mud.The red mud that Bayer process (Bayer) produces contains higher ferric oxide, sodium oxide and aluminum oxide and lower silicon-dioxide.Because the composition of red mud changes fluctuation greatly with raw-material composition, the data that same producer different times provides have bigger difference, but the common feature of the red mud that produces with alumina producing Bayer process is: high oxidation iron, high-alkali, phosphorus, sulphur content are not high in the red mud.CaO in the red mud and Na
2O, K
2O increases affinability and plays an important role improving basicity of slag.Fe
2O
3The resource of oxygen and iron can be provided.A spot of Al
2O
3Dephosphorization is not had critical influence, and calcium aluminate then is the main component of steel-making refining desulfuration agent.
The present invention is further illustrated below in conjunction with embodiment.
Embodiment 1 usefulness red mud from sintering process prepares the method for hot metal pretreatment agent
The red mud that a kind of sintering process produces, its chemical ingredients is as shown in table 1.
The chemical ingredients of table 1 red mud from sintering process
| Composition | SiO 2 | Fe 2O 3 | Al 2O 3 | CaO | Na 2O | K 2O | TiO 2 | FeO | MgO |
| Quality % | 23.0 | 9.4 | 9.5 | 41.5 | 2.6 | 1.2 | 8.4 | 0.60 | 2.1 |
With this red mud oven dry back and Fe
2O
3, CaO, CaCl
2, SiO
2Carry out mix grinding.The mass percent of each chemical ingredients is in the said mixture: red mud is 20～25%, Fe
2O
3Be 38～45%, CaO is 25～32%, MnO
2Be 3～5%, CaCl
2Be 2～5%, SiO
2Be 3～5%, the CaO/SiO during mixture is formed
2Be 5～7.
The preparation of present embodiment is earlier this red mud to be dried, and presses the mass percent mixing of said mixture, and being milled to granularity then is below 120 orders, can be as the desiliconization agent or the dephosphorization and desulfurization agent of hot metal pretreatment.
The hot metal pretreatment agent of present embodiment preparation has very strong sweetening power and desiliconization ability.At 1400 ℃ molten iron is carried out pre-treatment, desulfurization degree reaches more than 85.0%, and the desiliconization rate is that dephosphorization rate reaches more than 33.3% more than 74.2%.
Embodiment 2 usefulness Bayer process red muds prepare the method for hot metal pretreatment agent
The red mud that a kind of sintering process produces, its chemical ingredients is as shown in table 2:
The chemical ingredients of table 2 Bayer process red mud
| Composition | SiO 2 | Fe 2O 3 | Al 2O 3 | CaO | Na 2O | K 2O | TiO 2 | FeO | MgO |
| Quality % | 12.0 | 23.3 | 17.1 | 15.2 | 4.5 | 1.3 | 5.9 | 5.4 | 2.8 |
With this red mud oven dry back and Fe
2O
3, CaO, Na
2CO
3, MnO
2, CaCl
2, SiO
2Carry out mix grinding.The mass percent of each chemical ingredients is in the said mixture: red mud is 15-19%, Fe
2O
3Be 40～45%, CaO is 30～38%, Na
2CO
3Be 0～3%, MnO
2Be 0～4%, CaCl
2Be 0～3%, SiO
2Be 5～9%, the CaO/SiO during mixture is formed
2Be 3.0～6.0.
The preparation of present embodiment is earlier red mud to be dried, and presses the mass percent mixing of said mixture, and being milled to granularity then is below 120 orders, can be as the desiliconization agent or the dephosphorization and desulfurization agent of hot metal pretreatment.
The hot metal pretreatment agent of present embodiment preparation has very strong sweetening power and desiliconization ability.At 1400 ℃ molten iron is carried out pre-treatment, its desiliconization, dephosphorization, desulfurization degree are respectively 70%, 35%, more than 88%.
Embodiment 3 usefulness sintering processs prepare the method for hot metal pretreatment agent with Bayer process red mud mixing slag
The mixture of a kind of sintering process, Bayer process red mud, its chemical ingredients is as shown in table 3:
The chemical ingredients of table 3 sintering process, Bayer process red mud mixture
| Composition | SiO 2 | Fe 2O 3 | Al 2O 3 | CaO | Na 2O | K 2O | TiO 2 | FeO | MgO |
| Quality % | 20.5 | 11.5 | 7.2 | 41.1 | 2.5 | 1.2 | 3.4 | 1.7 | 3 |
Should mix red mud oven dry back and Fe
2O
3, CaO, Na
2CO
3, CaCl
2, SiO
2Carry out mix grinding.The mass percent of each chemical ingredients is in the said mixture: red mud is 15～20%, Fe
2O
338～43% for, CaO is 30～38%, Na
2CO
3Be 1～3%, CaCl
2Be 1～5%, SiO
2Be 5～10%, the CaO/SiO during mixture is formed
2Be 3～7.
The preparation of present embodiment is earlier red mud to be dried, and presses the mass percent mixing of said mixture, and being milled to granularity then is below 120 orders, can be as the desiliconization agent or the dephosphorization and desulfurization agent of hot metal pretreatment.At 1350 ℃ molten iron is carried out pre-treatment, its desiliconization, dephosphorization, desulfurization degree are respectively 70%, 38%, more than 90%.
Claims (5)
1, a kind of production method of hot metal pretreatment agent is characterized in that red mud oven dry back and Fe
2O
3, CaO, Na
2CO
3, MnO
2, CaCl
2, SiO
2Or other metallurgical wastes that contain these compositions carry out mix grinding, and the quality percentage composition of each component is in the mixture: red mud is 15～30%, Fe
2O
3Be 38～45%, CaO is 25～40%, Na
2CO
3≤ 5%, MnO
2≤ 5%, CaCl
2≤ 5%, SiO
2≤ 10%.
2, the production method of hot metal pretreatment agent according to claim 1 is characterized in that the quality percentage composition of the main chemical compositions of described red mud is: SiO
2≤ 25%, Fe
2O
3〉=20% or CaO 〉=40%.
3, the production method of hot metal pretreatment agent according to claim 1 is characterized in that the CaO/SiO in the described mixture composition
2Be 3.0～7.0.
4, the production method of hot metal pretreatment agent according to claim 1, it is characterized in that described, the mix grinding granularity be below 120 orders.
5, according to the hot metal pretreatment agent of the production method made of each described hot metal pretreatment agent in the claim 1～4.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410013065 CN1285738C (en) | 2004-04-20 | 2004-04-20 | Preprocessing agent for molten iron and method for preparing same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410013065 CN1285738C (en) | 2004-04-20 | 2004-04-20 | Preprocessing agent for molten iron and method for preparing same |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1690228A CN1690228A (en) | 2005-11-02 |
| CN1285738C true CN1285738C (en) | 2006-11-22 |
Family
ID=35345982
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200410013065 Expired - Fee Related CN1285738C (en) | 2004-04-20 | 2004-04-20 | Preprocessing agent for molten iron and method for preparing same |
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Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103074484B (en) * | 2013-01-16 | 2014-12-03 | 北京矿冶研究总院 | Comprehensive treatment method of oolitic hematite containing phosphorus and red mud |
| CN103952515B (en) * | 2014-04-29 | 2017-01-04 | 北京科技大学 | A kind of iron red mud is used as the recycling method of steelmaking slag agent |
| CN108220521A (en) * | 2016-12-13 | 2018-06-29 | 鞍钢股份有限公司 | Molten iron desiliconizing agent taking high-iron red mud as matrix and using method thereof |
| CN107988458A (en) * | 2017-12-18 | 2018-05-04 | 莱芜市东冶新材料有限公司 | A kind of steel-making refining desulfuration agent based on red mud modification melting and preparation method thereof |
| CN110144434A (en) * | 2019-05-23 | 2019-08-20 | 兰州理工大学 | A kind of raw material of industry preparation amorphous steel pre-melted slag |
| CN110157902A (en) * | 2019-05-27 | 2019-08-23 | 东北大学 | A kind of method of red mud resource utilization in molten iron pretreatment |
| CN111004887A (en) * | 2019-11-29 | 2020-04-14 | 太原钢铁(集团)有限公司 | Preparation process of steel ladle heat-insulating agent and steel ladle heat-insulating agent |
| CN110982989B (en) * | 2020-01-17 | 2021-06-25 | 河南科技大学 | Preparation method and use method of slag condenser for molten iron pretreatment |
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2004
- 2004-04-20 CN CN 200410013065 patent/CN1285738C/en not_active Expired - Fee Related
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