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A 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, environmental pollution and other problems in high-temperature roasting, and achieve the effects of low equipment requirements, large loss rate and low recovery rate

Active Publication Date: 2018-05-01
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] The tin-bearing iron ore with a TFe grade of 32.11% and a Sn content of 0.18% is 80% after crushing and grinding to -0.074mm; according to the mass fraction of tin-bearing iron ore 10%, 10%, 3%, 1%, 2% Add additives calcium carbonate, sodium carbonate, sodium sulfate, borax, and sodium humate respectively, mix well and pelletize in a disc pelletizer; dry pellets with excess lignite as reducing agent, reduction temperature 1050°C, reduction time 60min ; The reduced roasted product is cooled and ground to -0.074mm, accounting for 85%, and magnetically separated at a magnetic separation intensity of 1000Gs. The iron grade in the obtained tin-iron 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] The tin-bearing iron ore with a TFe grade of 32.11% and a Sn content of 0.18% accounts for 85% after crushing and grinding to -0.074mm; according to the mass fraction of tin-bearing iron ore 6%, 12%, 5%, 2%, and 1% Add additives calcium carbonate, sodium carbonate, sodium sulfate, borax, and sodium humate respectively, mix well and pelletize in a disc pelletizer; dry pellets with excess bituminous coal as reducing agent, reduction temperature 900°C, reduction time 120min ; The reduced roasted product is cooled and ground to -0.074mm, accounting for 87%, and magnetically separated at a magnetic separation intensity of 800Gs. The iron grade in the obtained tin-iron coarse 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] The tin-bearing iron ore with a TFe grade of 32.11% and a Sn content of 0.18% accounts for 83% after crushing and grinding to -0.074mm; according to the mass fraction of tin-bearing iron ore 5%, 8%, 3%, 1.5%, 1.6% Add additives calcium carbonate, sodium carbonate, sodium sulfate, borax, and sodium humate respectively, mix well and briquette; add excess lignite as reducing agent to the dry mass, reduce temperature at 1000°C, and reduce time for 100 minutes; reduce the roasted product and cool it Post-grinding to -0.074mm accounts for 81%, and magnetic separation is performed at a magnetic separation intensity of 1500Gs. The iron grade in the obtained tin-iron coarse 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, belonging to the field of iron and steel metallurgy. Background technique [0002] Free-cutting steel is formed by adding an appropriate amount of chemical elements (such as sulfur, phosphorus, lead, calcium, selenium, tellurium, etc.) that can improve machinability to form favorable non-metallic inclusions in the steel, and some additions can dissolve Solid solution (such as ferrite) to improve its machinability alloy steel. Such steels can be cut with higher cutting speeds and larger depths of cut. Its main advantage is to reduce the cutting resistance of steel, and at the same time, the characteristics of the easy-cutting elements themselves and the formed compound can lubricate the cutting tool, easy to break chips, and reduce wear, thereby reducing the surface roughness of the workpiece and improving the surface roughness of the workpiece. ...

Claims

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Application Information

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Patent Type & Authority Patents(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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