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Method for preparing tin-iron coarse alloy powder from tin containing iron ore

A crude alloy and iron ore technology, applied in the field of iron and steel metallurgy, can solve the problems of high energy consumption, high production cost, and environmental pollution of high-temperature roasting, and achieve the effects of low equipment requirements, high loss rate, and low recovery rate

Active Publication Date: 2016-05-25
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Its main raw materials are all using SnS, SnCl 2 , SnO’s high-temperature volatilization characteristics, the tin-containing material is mixed with vulcanizing agent, chlorinating agent and reducing agent and then roasted at high temperature. SO 2 , HCl, Cl 2 and other harmful gases seriously pollute the environment, corrode equipment, high-temperature roasting consumes a lot of energy, and the production cost is high
[0005] In summary, the existing processes for comprehensive utilization of tin-containing iron ore resources have problems such as low recovery rate, high cost, and serious pollution. It is urgent to develop an efficient and environmentally friendly method for comprehensive utilization of tin-containing iron ore resources

Method used

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  • Method for preparing tin-iron coarse alloy powder from tin containing iron ore

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Experimental program
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Effect test

Embodiment 1

[0024] TFe grade 32.11%, Sn content 0.18% tin-containing iron ore, after crushing and grinding to -0.074mm accounted for 80%; according to the mass fraction of tin-containing iron ore 10%, 10%, 3%, 1%, 2% Add the additives calcium carbonate, sodium carbonate, sodium sulfate, borax, and sodium humate respectively, and pellet them in a disc pelletizer after mixing; add excessive lignite as a reducing agent outside the dried pellets, the reduction temperature is 1050℃, and the reduction time is 60min ; After cooling, the reduced roasted product is ground to -0.074mm accounting for 85%, and magnetic separation is carried out at a magnetic separation intensity of 1000Gs. The iron grade of the ferro-tin coarse alloy powder is 90.11%, the iron recovery rate is 92.19%; the tin grade is 0.52%, and the tin recovery rate is 92.10%.

Embodiment 2

[0026] TFe grade 32.11%, Sn content 0.18% tin-containing iron ore, after crushing and grinding to -0.074mm accounted for 85%; according to the mass fraction of tin-containing iron ore 6%, 12%, 5%, 2%, 1% Add the additives calcium carbonate, sodium carbonate, sodium sulfate, borax, and sodium humate respectively, and pellet them in a disc pelletizer after mixing; add excess bituminous coal as a reducing agent outside the dried pellets, the reduction temperature is 900℃, and the reduction time is 120min ; After cooling, the reduced roasted product is ground to -0.074mm accounting for 87%, and magnetic separation is carried out at a magnetic separation intensity of 800Gs. The iron grade of the crude tin-iron alloy powder is 89.23%, the iron recovery rate is 93.19%; the tin grade is 0.50%, and the tin recovery rate is 90.31%.

Embodiment 3

[0028] TFe grade 32.11%, Sn content 0.18% tin-containing iron ore, after crushing and grinding to -0.074mm accounted for 83%; according to the mass fraction of tin-containing iron ore 5%, 8%, 3%, 1.5%, 1.6% Add the additives calcium carbonate, sodium carbonate, sodium sulfate, borax, and sodium humate respectively, and then press them after mixing; dry the agglomerate with excess lignite as a reducing agent, the reduction temperature is 1000℃, the reduction time is 100min; the reduced roasted product is cooled After grinding to -0.074mm accounted for 81%, magnetic separation was performed at a magnetic separation intensity of 1500Gs. The iron grade of the ferro-tin alloy powder is 88.81%, the iron recovery rate is 94.00%, the tin grade is 0.50%, and the tin recovery rate is 91.67%.

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Abstract

The invention discloses a method for preparing tin-iron coarse alloy powder from tin containing iron ore. The method includes the steps that after being broken and ground, the tin containing iron ore is mixed with a composite additive formed by calcium carbonate, sodium carbonate, sodium sulfate, borax and sodium humate for agglomeration; obtained agglomerates are dried and then subjected to high-temperature reducing roasting; the products obtained after reducing roasting are sequentially cooled, broken and ground, and then are subjected to magnetic separating, and the coarse alloy powder is obtained. The method has the advantages that the requirement on the raw materials is low, the tin-iron comprehensive recovery rate is high, the flow is simple, energy consumption is low, and environment friendliness is achieved, and the prepared coarse tin-iron alloy powder can directly serve as raw materials for smelting tin containing easy-to-cut steel and tin containing alloy cast iron.

Description

Technical field [0001] The invention relates to a method for preparing tin-iron coarse alloy powder from tin-containing iron ore, and belongs to the field of iron and steel metallurgy. Background technique [0002] Free-cutting steel is formed by adding appropriate amounts of chemical elements that can improve machinability (such as sulfur, phosphorus, lead, calcium, selenium, tellurium, etc.) to form beneficial non-metallic inclusions in the steel, and some can be dissolved in Solid solution (such as ferrite) to improve its machinability alloy steel. This type of steel can be cut with a higher cutting speed and a larger depth of cut. Its main advantage is to reduce the cutting resistance of steel. At the same time, the characteristics of the free-cutting element itself and the formed compound play the role of lubricating the cutting tool, easy to break chips, reduce wear, thereby reducing the surface roughness of the workpiece, and improving Tool life and production efficiency...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/02C22C35/00
CPCC22B1/02C22C35/005
Inventor 张元波李光辉姜涛苏子键文佩丹刘兵兵范晓慧彭志伟黄柱成郭宇峰杨永斌李骞陈许玲徐斌甘敏张鑫陈迎明杜明辉刘继成欧阳学臻
Owner CENT SOUTH UNIV
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