The study on heap bioleaching for gold recovery from refractory ores using non-cyanide lixiviant
Bioleaching of sulfide gold-bearing ores with gold locked-up in sulfides followed by gold leaching is an effective way to treat pyrite-arsenopyrite ores. In this connection, IRGIREDMET JSC carried out tests on heap (percolation) bioleaching. Sulfide gold-bearing ore sample from a Russian deposit was used. Gold grade was 2.0 g/t with 2.2％ pyrite, 1.2％ arsenopyrite and 12.0％ carbonates. The samples ground to -2 mm, -5 mm and - 10 mm in the amount of 10 kg were charged to leaching columns at the temperature of 28 - 301. A mixture of bacteria was prepared using Acidithiobacillus thiooxidans and Acithiobacillus ferooxidans adapted to the ore from the deposit. It was found that heap bioleaching under percolation followed by cyanidation gives 75％ - 85％ gold recovery if ground to - 2 mm. The same recovery was achieved using gold thiosulphate leaching. The results confirmed that non-cyanide lixiviants may be used to recover gold from refractory ores.
heap bioleaching gold recovery refractory ores
Sergey S. Gudkov Yuri Ye. Yemelianov Liudmila Ye. Shketova Alexandra N.Mikhailova
IRGIREDMETJSC38, Gagarina blvd, 664025, Irkutsk, Russia
国际会议
The 19th International Biohydrometallurgy Symposium(第19届国际生物湿法冶金大会 IBS2011)
长沙
英文
813-817
2011-09-18（万方平台首次上网日期，不代表论文的发表时间）