Recovery of antimony from antimony-bearing dusts through reduction roasting process under CO—CO₂ mixture gas atmosphere after firstly oxidation roasted

Abstract

This paper mainly investigated the antimony recovery from antimony-bearing dusts through reduction roasting process after the dust firstly oxidation roasted. CO—CO₂ mixture gas was used as reducing agent, and the antimony-containing phase was reduced into Sb₄O₆, volatilized into smoke, and finally recovered through the cooling cylinder. The antimony recovery rate increased from 66.00 wt% to 73.81 wt% in temperature range of 650 to 800 °C, and decreased with temperature increased further to 900 °C due to the reduction of Sb₄O₆ to the nonvolatile Sb. Similarly, the CO partial pressure also played a double role in this test. Under optimized conditions of roasting temperature of 800 °C, CO partial pressure of 7.5 vol% and roasting time of 120 min, 98.40 wt% of arsenic removal rate and 80.40 wt% antimony recovery rate could be obtained. In addition, the “As₂O₃” product could be used for preparing ferric arsenate which realized the harmless treatment of it.

Keywords

antimony-bearing dust / separation of arsenic and antimony / antimony recovery / reduction roasting / waste utilization

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