METHOD OF PROCESSING SILICATE REDUCED SLAG BY VACUUM DISTILLATION, CONTAINING ANTIMONY, LEAD AND SILVER Russian patent published in 2019 - IPC C22B11/00 C22B9/04 C22B13/00 C22B5/16 C22B30/02 

FIELD: metallurgy.

SUBSTANCE: invention relates to metallurgy of non-ferrous and precious metals and can be used in separation of Sb-Pb-Ag alloy components (reduced silicate slag). Successive stages of vacuum distillation are carried out at pressure 0.133–4.4 Pa and process time 10 hours. First, at distillation temperature of 896–1,250 K, antimony is sublimated by 99–99.9 mol% to obtain antimony condensate containing 1.81–63.3 mol% of lead and silver. Then, lead distillation is carried out at distillation temperature of 1,268–1,640 K at 94–98 mol% to obtain lead condensate containing 3.58–34.25 mol% of silver and vat silverized sediment. Content of silver in still residue is 96.42–65.75 mol%.

EFFECT: method ensures high degree of extraction of easily sublimate metals into gaseous phase and low content of hard sublimate metal-impurities in composition of obtained condensates.

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