Irgiredmet experience on gold biometallurgy
This paper presents a brief overview of IRGIREDMET experience on gold biometallurgy. The first studies on gold biometallurgy at Irgiredmet started at the beginning of the 1970s. It was connected with gold dissolution by bioleaching. Special bacterial strains and products of their metabolism which were able to dissolve gold were founded and separated. The studies on dissolved and colloidal gold precipitation by Aspergillus niger and Aspergillus orizal fungoid microorganisms were also done. The pioneer study on selective bioheterocoagulation of fine and colloidal gold was conducted. It was found that gold grade in flotation plants tails may be 10％ -20％ decreased using gold bio-hetero coagulation with flotation of bio aggregates. This fact was confirmed by industrial scale tests conducted at Taseevsky flotation plant (the Chita region, Russia). The most important part of Irgiredmet developments in an area of biometallurgy was the complex of theoretical and practical testwork called Biogeotechnology of gold and silver according to the State technical research program Latest bioengineering methods. The main direction of the program was biooxidation of gold bearing sulfides (pyrite, arsenopyrite etc. ) using Thiobacillus Ferrooxidans and Thiobacillus Thiooxidans bacterial strains. Different aspects of stirred tank and heap bioleaching including main regularities of sulfide biooxidation, sufficient degree of sulfide oxidation for maximum gold recovery, the behavior of gold and silver minerals with determination of dissolution of this metals during bio oxidation, biooxidation amenability tests for concentrates from operating and designed mines of Russia and CIS, the effective methods of neutralisation and detoxification of biohydrometallurgy products etc were studied.
gold biometallurgy bacterial strains biooxidation of sulfides gold bioleaching gold precipitation bioheterocoagulation stirred tank and heap biooxidation.
V. E. Dementyev G. I. Voiloshnikov
IRGIREDMET JSC 38, 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
818-820
2011-09-18（万方平台首次上网日期，不代表论文的发表时间）