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Method of removing arsenic and selenium for antimony smelting by pyrometallurgy

A technology of pyro-refining and refining furnace, which is applied in the field of removing arsenic and selenium impurities in antimony pyro-refining, which can solve the problems of slow slagging reaction speed, recycling environmental pollution, and low grade, so as to speed up the slagging reaction speed and reduce the Loss of antimony in slag and improvement of product quality

Inactive Publication Date: 2005-08-24
锡矿山闪星锑业有限责任公司
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  • Summary
  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method has the disadvantages of slow slagging reaction speed, long time, high consumption of soda ash, complicated operation, and the gas CO produced by the reaction 2 It is difficult to separate from scum to form bubble slag, which makes the slag contain high antimony. At the same time, because of the low efficiency of arsenic and selenium removal, the grade of arsenic and selenium contained in the slag is not high, which is not conducive to the secondary treatment of scum and the recovery of arsenic. causing environmental pollution
Chinese invention patent 90107550.7 discloses a process for removing selenium from antimony by adding aluminum. Although this process can achieve the purpose of selenium removal, there are problems such as complicated process, long smelting time, and difficult disposal of selenium slag produced.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Weigh 300g of crude antimony containing 1.12% arsenic and 0.0097% selenium, pour it into a porcelain crucible, and then heat it in a 920°C electric furnace. After 4 minutes, the crude antimony is completely melted, and then add 20g of potassium hydroxide to remove arsenic and selenium , and at the same time blow compressed air to the antimony liquid to stir. After 5 minutes, it starts to cool down to 700 ° C. After 10 minutes, the slagging reaction is completed, and the blowing is stopped. After sampling and analysis, the antimony contains 0.016% arsenic and 0.0009% selenium.

Embodiment 2

[0022] In the same reverberatory furnace used in Comparative Example 2 to produce ultra-pure refined antimony, 32.5 tons of crude antimony were first smelted with crude antimony redox, and the crude antimony contained 0.25% arsenic and 0.019% selenium. Raise the temperature to 880°C, add 500 kg of arsenic and selenium-removing agent sodium hydroxide, pass through compressed air and stir for 120 minutes to complete the slagging reaction, and take a sample after cleaning the slag. The standard requires that the refining process takes 3 hours to obtain 29.3 tons of qualified products, and the resulting refining slag contains 16.20% antimony, 14.1% arsenic and 0.96% selenium.

Embodiment 3

[0026] To produce No. 2 refined antimony in an industrial reverberatory furnace, first smelt 31.5 tons of crude antimony with redox reduction of crude antimony. The crude antimony contains 0.28% arsenic and 0.015% selenium. The furnace temperature is raised to 950°C, and hydrogen is added to remove arsenic and selenium. Add 475kg of sodium oxide, feed compressed air and stir for 80 minutes, the reaction temperature gradually drops to 720°C, and the slagging reaction is basically completed. After the slag removal was completed, sampling and analysis showed that the antimony solution contained 0.021% arsenic and 0.0002% selenium, and the quality met the national standard. The refining process took 2.5 hours to obtain 31 tons of products. The resulting refining slag contains 17.8% antimony, 13.82% arsenic and 0.79% selenium.

[0027] The percentages in each of the above-mentioned comparative examples and the examples are percentages by weight.

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Abstract

The antimony-pyrosmelting refining method for removing arsenic and removing selenium includes the following steps: placing crude antimony containing arsenic and selenium into refining furnace, heating and melting them, and heating to 650-1000 deg.C, and once adding alkaline metal hydroxide required for removing arsenic and selenium, then introducing compressed air and stirring for 15-150 min. to implement slagging, arsenic-removing and selenium-removing reaction to produce arseniate and selenite float slag, separating slag and antimony.

Description

technical field [0001] The invention relates to a method for removing arsenic and selenium impurities in nonferrous metal smelting, in particular to a method for removing arsenic and selenium impurities in antimony fire refining. Background technique [0002] In the production process of antimony refining, in order to obtain qualified refined antimony, the impurities in the crude antimony must be removed separately. In the current national standard for refined antimony, the arsenic content should be less than 0.05%, and the selenium content should be less than 0.005%. The method used in the prior art to achieve this goal is to add soda ash in sections under high temperature conditions, and repeatedly react with the arsenic and selenium impurities in the crude antimony under the condition of bubbling compressed air to form scum, and then the scum Antimony is separated to obtain qualified refined antimony. This method has the disadvantages of slow sl...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B30/02
Inventor 金贵忠李松柏邓卫华龚福保张忠祖李文梅金承永曾奇斌廖静波邹雄高
Owner 锡矿山闪星锑业有限责任公司
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