PROCEDURE FOR COMBINED PROCESSING OF REBELLIOUS LEAD-ZINC ORES Russian patent published in 2012 - IPC C22B19/00 C22B13/00 B03D1/02 

FIELD: metallurgy.

SUBSTANCE: first, the ore is supplied to a cycle of the main lead-zinc flotation accompanied by foam-producing agent supply, a sulphydric collector and zinc minerals depressing agent that does not contain cyanide. The resulting crude lead-zinc concentrate is subjected to cleaning lead-zinc flotation, a lead-zinc concentrate and lead-zinc middlings are obtained, processed in a cycle of lead-zinc flotation of middlings. Final tailings are obtained that contain pyrite and lead-zinc concentrate. In the second yield of the cycle of the main lead-zinc flotation the product is obtained which is then subjected to further flotation in the cycle of primary zinc flotation that yields rough zinc concentrate and final tailings. The rough zinc concentrate is processed during cleaning zinc flotation that yields commercial zinc concentrate and zinc middlings. The zinc middlings from the cleaning zinc flotation cycle is supplied to the cycle of zinc flotation of middlings that yields final tailings and zinc concentrate. The lead-zinc concentrate of the cleaning lead-zinc flotation cycle and concentrates from the cycles of lead-zinc and zinc middlings flotation are combined and sent to hydrometallurgical processing.

EFFECT: production of metallic zinc, lead concentrate and silver dore alloy.

14 cl, 1 tbl, 1 ex