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Method for deeply removing antimony and copper impurities from regenerated crude tin

A technology of thick tin and antimony copper, applied in the field of metallurgy, can solve the problems of lower removal temperature, high energy consumption, cumbersome steps of antimony copper removal, etc., and achieve the effect of preventing oxidation, low temperature and good effect of impurity removal

Active Publication Date: 2021-01-05
INST OF RESOURCES UTILIZATION & RARE EARTH DEV GUANGDONG ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a method for deeply removing antimony copper impurities in regenerated crude tin for crude tin containing 0.2-0.5wt% antimony and 0.01-0.03wt% copper, which is easy to operate, and simultaneously reduces the removal temperature and can Low consumption, good impurity separation effect, safety and environmental protection, and deantimony copper at the same time, the quality of crude tin can reach AA grade Sn99. It is less than 0.008wt%, which reduces the environmental pollution problems existing in the existing technology of adding aluminum to remove antimony, adding sulfur and removing copper, and solves the problems of cumbersome steps and high energy consumption for removing antimony copper in the prior art

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] The crude tin raw material is obtained by reduction of electroplating tin sludge, which contains antimony Sb0.5wt% and copper Cu0.01wt%. Weigh 560g of crude tin and put it into a refining pot, heat it to 260°C, and add 10g of antimony-copper remover while stirring. The antimony-copper remover is composed of 7% aluminum, 80 % borax, 3% tin sulfide and 10% coke powder are mixed. After adding materials, continue to stir for 30 minutes, then raise the temperature to 380°C, stir at constant temperature for 30 minutes, cool down to 230°C and remove scum, take samples and send them for analysis, ICP-MS detection As a result, the antimony content was 0.01 wt%, and the copper content was 0.003 wt%.

Embodiment 2

[0018] Referring to Example 1, the difference is that the antimony-copper removing agent does not add aluminum, and its total mass fraction is 100%, and it is formed by mixing 87% borax, 3% tin sulfide and 10% coke powder, and the specific steps are as follows:

[0019] Weigh 560g of thick tin (containing antimony Sb0.5wt%, containing copper Cu0.01wt%) and put it into a refining pot, heat to 260°C, add 10g of antimony-copper removal agent while stirring, and the antimony-copper removal agent is The total mass fraction is 100%, and it is composed of 87% borax, 3% tin sulfide and 10% coke powder. After adding the materials, continue to stir for 30 minutes, then heat up to 380°C, stir at constant temperature for 30 minutes, cool down to 230°C and remove The scum was sampled and sent for analysis. The ICP-MS test results showed that the antimony content was 0.03wt%, and the copper content was 0.003wt%.

[0020] The obtained product was placed in the refining pot again, the above s...

Embodiment 3

[0023] The crude tin raw material is obtained by reduction of electroplating tin sludge, which contains antimony Sb0.2wt% and copper Cu0.03wt%. Weigh 1060g of crude tin and put it into a refining pot, heat to 280°C, add 8g of antimony copper remover while stirring (based on its total mass fraction as 100%, composed of 90% borax, 3% tin sulfide and 7% coke Powder mixed), continue to stir for 40min after feeding, cool down to 230°C and remove scum, take a sample and send it for analysis. The ICP-MS test result shows that the antimony content is 0.013wt%, and the copper content is 0.001wt%.

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Abstract

The invention discloses a method for deeply removing antimony and copper impurities from regenerated crude tin. Borax and tin sulfide are mainly used as antimony and copper removing agents, the operation is easy, additionally, the removing temperature is reduced, the energy consumption is low, the impurity separation effect is good, the effects of safety and environmental friendliness are achieved, antimony and copper are simultaneously removed at one time, the quality of the crude tin reaches Sn99.90 of the AA grade, the requirements of GB / T728-2010 are met, the content of the impurity Sb islower than 0.02 wt%, the content of the impurity Cu is lower than 0.008 wt%, the problem of environmental pollution caused by adding aluminum to remove antimony and adding sulfur to remove copper in the prior art is solved, and the problems of complex antimony and copper removing steps and high energy consumption in the prior art are solved.

Description

Technical field: [0001] The invention relates to the field of metallurgy, in particular to a method for deeply removing antimony-copper impurities in regenerated crude tin. Background technique: [0002] In the process of tin consumption, a large amount of tin-containing alloy materials are produced. Different sources of tin have different types and contents of impurities. Common impurities include iron, copper, arsenic, antimony, lead, bismuth, etc., which have a great influence on the properties of tin. Therefore, the national standard GB / T728-2010 for tin ingots has clear requirements for various impurities in tin. Like copper, the less copper in the tin used as the plating layer, the better, because copper not only forms toxic compounds, but also reduces the stability of the plating layer. When the content of antimony is 0.5%, the elongation of tin decreases, and the hardness and tensile strength increase, but the ductility of tin remains unchanged. [0003] At present...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/00C22B25/02C22B25/08
CPCC22B7/001C22B25/02C22B25/08Y02P10/20
Inventor 高远袁祥奕曹洪杨刘志强张魁芳李伟郭秋松陶进长蒋玉思
Owner INST OF RESOURCES UTILIZATION & RARE EARTH DEV GUANGDONG ACAD OF SCI
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