Influence of microorganisms on arsenic-bearing materials dissolution
For the purpose of decrease of the negative influence on the ecosystem its necessary to remove arsenic from technological cycle in compact, low soluble form, stable under the protracted storage in the air under the influence of humidity and micro-organisms. The most suitable forms of arsenic compounds with minimal extent of toxicity are arsenic sulphides and a number of arsenic compounds on the basis of sulphoarsenates. In practice of metallurgical enterprises of Kazakhstan arsenic removal in the form of arsenatearsenite cakes is mostly spread. Agency of protection of the environment of USA showed that arsenate cakes cant be stable under protracted storage because carbon dioxide in the air transforms calcium arsenite and arsenate into calcium carbonate, and extracted in this process arsenic comes into the environment. Natural conditions of burial of cakes, climatic factors, micro-organisms presence etc. influence the arsenic transformation. There was studied the survival rate of thion bacteria and also arsenite-oxidizing and arsenate-reductive bacteria in conditions of protracted contact with arsenic-containing sublimates and possibility of creation of soluble arsenic forms from arsenicbearing sulfide sublimate. We found out that in the whole obtained results show that autotrophic thion bacteria are not able to grow in conditions of periodic cultivation and in the absence of forcible aeration and dont significantly influence the arsenic emission from sublimates into the solution. Arsenite-oxidizing and arsenate-reductive bacteria may influence the process of arsenic transformation in sulfide sublimate. Sulphidization of the ore and technogenous materials permits to extract arsenic in sulphide form. For provision of the protracted storage of arsenious sulphide sublimates without arsenic emission into environment sublimate before burial should be washed off from oxidizing forms.
Kazakhstan arsenic-bearing materials dissolution thion arsenite-oxidizing arsenate-reductive bacteria
Vladimir Luganov Tatyana Chepushtanova
Erkebulan Kilibayev, Shanibai Baiysbekov Kazakh National technical University named after K. I. Satp Erkebulan Kilibayev, Shanibai Baiysbekov Kazakh National technical University named after K. I. Satp
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
721-726
2011-09-18（万方平台首次上网日期，不代表论文的发表时间）