FIELD: metallurgy.
SUBSTANCE: invention relates to non-ferrous metallurgy and can be used for processing of secondary indium raw material – indium arsenide. Charge is prepared by mixing the wastes with zinc chloride and ammonium chloride in ratio InSb:ZnCl2:NH4Cl = 1:(0.8–0.9):(0.2–0.3). Charge is loaded into melt of circulating lead with temperature of 350–450 °C, coated with layer of 0.5–1 cm of salt molten of zinc chloride. Temperature is increased to 400–500 °C and charge is mixed with lead melt by means of filter rotation in the form of upper and lower cone-shaped plates connected by large bases with formation of filtering slot with gap of 3–5 mm between plates with windows. Periodically after 15 minutes there is a precipitate – solid crystals of antimony compound Zn3Sb2 – between the plates. In the absence of a sediment indicative of the end of the process, the temperature is reduced to 330–350 °C and removing formed salt melt containing complex compound InCl×2ZnCl2 from the lead melt surface. Filtering slot of the plates is compressed to gap of 0.1 mm and lead is cleaned from the sediment formed between the plates by gripping the precipitate crystals into the windows of the plates and filling them into the filter cavity.
EFFECT: disclosed method enables decomposition of indium antimonides with extraction of 88–95 % indium into metal taking into account extraction from salt melt and subsequent separation of antimony.
1 cl, 1 dwg, 1 tbl, 1 ex
