METHOD OF LEACHING GOLD FROM SULFIDE ORES

摘要

OF DISCLOSURE A method of leaching gold contained in sulfide ores or leaching residue after leaching the sulfide ores (hereinafter referred to as raw materials) includes 5 bringing an aqueous acidic solution which contains chloride ion, bromide ion, copper ion, and iron ion, into contact with the raw materials under supply of an oxidizing reagent, so as to leach gold contained in the raw materials; and retaining the aqueous acidic solution from which gold was 10 leached while keeping the concentration of bromide ion of 40 g/L or more and redox potential (vs Ag/AgCl) at 500 mV or above. Changes in Gold Concentrations in leachates with various bromide concentrations and redox potentials (ORP) BrConc. ORP 6 0 60g/L 480mV 0 80g/L 48OmV 400 20g/L 500mV 3____ 40g/L 500mV 3p a> 60g/L 500mV o 2 0 0 ~1 20g/L 500mV 0 2 4 6 8 10 Lapsed Days (Day) Fig. 1