METHOD FOR SELECTIVE FLOTATION OF STIBNITE FROM GOLD-SULPHIDE ORES Russian patent published in 2025 - IPC B03D1/02 

FIELD: chemistry.

SUBSTANCE: proposed invention relates to flotation concentration of gold-sulphide ores containing the main valuable component of gold, as well as antimony, which is represented in ore by industrial minerals stibnite (antimonite) Sb₂S₃. Method for selective flotation of stibnite from gold-sulphide ores involves grinding to size of not more than 45-65% of control class minus 71 mcm in conditions of natural alkalinity, then depending on initial weight fraction of antimony and arsenic and their ratio in gold-sulphide ore in presence of activators sulphide minerals and sulfhydryl collectors, in form of butyl xanthogenate, or dibutyl dithiophosphate, or a composition of butyl xanthogenate and dibutyl dithiophosphate in ratio of 1:1, stibnite is successively floatated into a crude antimony concentrate and into a collective gold-antimony-arsenic concentrate, or stibnite is floated into a crude gold-sulphide concentrate with subsequent deantimonization. Method then includes selective flotation of stibnite from crude antimony concentrate, collective gold-antimony-arsenic or crude gold-sulphide concentrates in starvation mode on stibnite activator – lead nitrate – 10 g/t and sulfhydryl collector sodium diethyldithiocarbamate – (C₂H₅)₂NS₂Na – 5 g/t. For selective extraction of stibnite into foam product, pulp is pre-conditioned with sodium thiosulphate at specific consumption of 350-700 g/t.

EFFECT: increased extraction of stibnite in antimony-conditioned concentrate and improved quality of crude gold-sulphide concentrates sent for cyanidation due to deantimonization.

3 cl, 2 tbl, 2 ex