The invention discloses an
antimony sulfide concentrate
smelting process. The
antimony sulfide concentrate
smelting process comprises the steps of controlling potential strengthening leaching, hydrolyzing, controlling potential
arsenic precipitation, dechlorination, strengthening reduction
smelting; firstly, the
antimony sulfide concentrate is subjected to strengthening leaching through a controlled potential shear to obtain a
leachate and leached residues, the
leachate is restored and then cooled to precipitate elemental
sulfur, carrying out dilute
hydrolysis on the
sulfur-removed
leachate toobtain the antimony oxychloride and the hydrolyzed liquid, after the hydrolyzed liquid is subjected to the controlling potential
arsenic precipitation to remove
arsenic and then returning to the hydrolytic liquid for use, removing
chlorine from the antimony oxychloride to obtain crude
antimony oxide and dechlorinated liquid, the dechlorinated liquid is electrolyzed by a diaphragm to obtain caustic soda and
chlorine, the caustic soda is reused for dechlorination of crude antimony oxychloride, the
chlorine is used for controlling potential leaching, the crude
antimony oxide is subjected to intensified reduction smelting by adopting a low-temperature
molten pool to obtain refined antimony, or is treated by a
plasma furnace to obtain the high-purity
antimony oxide. According to the antimony sulfide concentrate
smelting process, the low-concentration SO2
pollution can be eliminated from the source, the generation of arsenic alkali residue is avoided, and the process has the characteristicsof cleanness and
environmental protection.