METHOD OF EXTRACTING TIN FROM CRUDE LEAD WITH REFINING FROM IMPURITIES Russian patent published in 2020 - IPC C22B25/00 C22B9/02 C22B30/02 C22B5/16 

FIELD: metallurgy.

SUBSTANCE: invention relates to metallurgy of non-ferrous metals and can be used for separation and concentration of tin from As-Sb-Pb-Sn alloy. Method is carried out by successive stages of vacuum sublimation of arsenic for 3 hours at temperature of arsenic distillation of 681–759 K and pressure of 20–50 Pa with obtaining arsenic condensate, in which content of antimony, lead and tin is 0.056–0.296 mol%. Then at antimony and lead distillation temperature of 878–1073 K and pressure ≤ 0.1 Pa for 10 hours to obtain antimony-lead condensate, in which content of tin is 0.0005–0.0808 mol%, and tin-containing still residue, content of tin in which is 90–99 mol%.

EFFECT: method enables to control the degree of separation of impurity elements, increase selectivity when producing arsenic- and antimony-lead condensate, as well as still residual residue of tin according to corresponding impurities.

1 cl, 1 tbl