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Arsenic removal method used in pyrometallurgucal process for antimony

A technology for pyrometallurgical smelting and crude antimony, applied in the field of pyrometallurgical smelting of antimony, can solve the problems of easy formation of slag bubbles, reduced antimony recovery rate, inability to effectively remove arsenic, etc., and achieves the effect of ensuring the effect of removing impurities and shortening the smelting time.

Active Publication Date: 2014-01-22
(CNBM) BENGBU DESIGN & RES INST FOR GLASS IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The inventor has conducted many studies on the antimony smelting process and found that the main reason affecting the effect of removing arsenic impurities is that the melting point of the composite melting agent used is low, which makes the arsenic in the raw material difficult to be oxidized and cannot effectively remove arsenic; in addition , also because of the low melting point of the compound smelting agent, it is extremely easy to form scum during smelting, which reduces the recovery rate of antimony

Method used

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  • Arsenic removal method used in pyrometallurgucal process for antimony

Examples

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Effect test

Embodiment 1

[0017] (1) Take the following raw material proportions by weight to form a composite melting agent, 70 parts of anhydrous sodium carbonate, 10 parts of sodium nitrate, 0.5 parts of quartz sand, and 1 part of borax, mix well and set aside.

[0018] (2) Take Industry 2 # 100kg of antimony, broken into small pieces, put 2kg of compound melting agent into the crucible boiler together, heat until completely melted; then smelt, the melting temperature is 700°C, and the melting time is 3 hours; in the later stage of smelting, blow compressed air; the smelting is over After cooling, slag removal and separation are carried out to obtain antimony material;

[0019] (3) The antimony material obtained in step (2) is repeated 3 times according to step (2), and the smelting time is 2 hours;

[0020] After the last smelting and slag removal, the molten antimony can be directly cast into antimony ingots or water-quenched antimony.

Embodiment 2

[0022] (1) Take the following raw material proportions by weight to form a composite melting agent, 80 parts of anhydrous sodium carbonate, 15 parts of sodium nitrate, 5 parts of quartz sand, and 3 parts of borax, mix well and set aside.

[0023] (2) Take Industry 2 # 100kg of antimony, broken into small pieces, put 3kg of compound melting agent into the crucible boiler together, heat until completely melted; then smelt, the melting temperature is 1000°C, and the smelting time is 4 hours; in the later stage of smelting, blow compressed air; the smelting is over After cooling, slag removal and separation are carried out to obtain antimony material;

[0024] (3) The antimony material obtained in step (2) is repeated 3 times according to step (2), and the smelting time is 3 hours;

[0025] After the last smelting and slag removal, the molten antimony can be directly cast into antimony ingots or water-quenched antimony.

Embodiment 3

[0027] (1) Take the following raw material proportions by weight to form a composite melting agent, 75 parts of anhydrous sodium carbonate, 12 parts of sodium nitrate, 3 parts of quartz sand, and 2 parts of borax, mix well and set aside.

[0028] (2) Take Industry 2 # 100kg of antimony, after being broken into small pieces, put 4kg of compound melting agent into the crucible boiler together, heat until it is completely melted; then smelt, the melting temperature is 850°C, and the smelting time is 4 hours; in the later stage of smelting, blow compressed air; the smelting is over After cooling, slag removal and separation are carried out to obtain antimony material;

[0029] (3) The antimony material obtained in step (2) is repeated three times according to step (2), and the smelting time is 3 hours;

[0030] After the last smelting and slag removal, the molten antimony can be directly cast into antimony ingots or water-quenched antimony.

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Abstract

The invention discloses an arsenic removal method used in a pyrometallurgucal process for antimony. The method comprises the following steps: heating crude antimony containing arsenic and a composite smelting agent to a molten state; smelting the above-mentioned molten raw materials to complete slagging and arsenic removal reactions; and finally, carrying out slag-antimony separation and repeating the previous steps several times to prepare a product; wherein the composite smelting agent comprises, by weight, 70 to 80 parts of anhydrous sodium carbonate, 10 to 15 parts of sodium nitrate, 0.5 to 5 parts of quartz sand and 1 to 3 parts of borax. With the composite smelting agent and a smelting method provided by the invention, 1000 ppm of arsenic in industrial No. 2 antimony is reduced to less than 10 ppm, the recovery rate of antimony is maintained to be more than 96%, and quality requirements of semiconductor thermoelectric materials and war industries on the raw material--antimony are completely met.

Description

technical field [0001] The invention relates to a method for pyrometallurgy of antimony, in particular to a method for removing arsenic impurities in the process of pyrometallurgy of antimony. Background technique [0002] Antimony and antimony white are the raw materials of alloys and pigment chemicals widely used in modern industry; high-purity antimony is also one of the basic materials of semiconductor industry. In order to meet the special requirements of some military and high-tech fields, especially the content of arsenic impurities must meet the relevant requirements, wherein the content of arsenic must be effectively reduced to less than 10ppm. [0003] At present, the methods of extracting antimony include electrolysis and pyrometallurgy. The electrolysis process is complicated and pollutes the environment seriously, so it has not been promoted in industrialization. The traditional antimony pyrometallurgy method includes three steps: melting, smelting and slag-an...

Claims

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Application Information

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IPC IPC(8): C22B30/02
Inventor 李公权陈直龚建平王大宽
Owner (CNBM) BENGBU DESIGN & RES INST FOR GLASS IND CO LTD
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