Abstract

The possibility of gold extraction from the concentrate obtained by secondary enrichment of flotation tails of Madneuli gold-containing
barite-polymetallic ore has been studied. Such concentrate contains the gold in the mineral in finely-impregnated form and is considered as
difficult-to-process material. It was shown that by the use of Fe2(SO4)3 as an oxidizer in thiourea acidic solution, the concentrate
preliminary milling and roasting at 400 0
C is necessary for the 90 % extraction of gold. By electrochemical method, the 90 % extraction is
reached at the system “soft” oxidation in the conditions of Red/Ox potential of 0.4 V in temperature range of 25-35 0
C

Key words: Electrochemical processing; gold-containing ores; flotation tails; barite-polymetallic