Method of removing arsenic and selenium for antimony smelting by pyrometallurgy
A technology of fire refining and refining furnace, which is applied in the field of removing arsenic and selenium impurities in antimony fire refining, which can solve the problems of slow slagging reaction speed, recycling environmental pollution, unfavorable scum secondary treatment, etc., and achieve slagging reaction Accelerated speed, reduced loss of antimony in slag, good environmental benefits
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Embodiment 1
[0017] 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. Comparative example 2
Embodiment 2
[0020] In the same reverberatory furnace used in comparative example 2, ultra-pure refined antimony was produced, and 32.5 tons of crude antimony were smelted with redox of crude antimony. The crude antimony contained 0.25% of arsenic and 0.019% of selenium. Raise the temperature to 880°C, add 500kg of sodium hydroxide, an arsenic and selenium removal agent, and stir for 120 minutes with compressed air to complete the slagging reaction. After cleaning the slag, take a sample. The antimony solution contains 0.0026% arsenic and 0.00008% selenium, reaching the quality 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. Comparative example 3
Embodiment 3
[0023] 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 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.
[0024] The percentages in each of the above-mentioned comparative examples and the examples are percentages by weight.
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