Two-stage process of bacterial-chemical oxidation of refractory pyrite-arsenopyrite gold-bearing concentrate

Autor:	T. A. Pivovarova, E. E. Savari, G. V. Sedelnikova, P. A. Zaulochnyi, T. F. Kondratieva, A. G. Bulaev
Rok vydání:	2011
Předmět:	Arsenopyrite education.field_of_study Gold cyanidation Thermophile Population Metallurgy Biology engineering.material Applied Microbiology and Biotechnology Biochemistry Sulfide minerals Chemical engineering Bioleaching visual_art visual_art.visual_art_medium engineering Pyrite education Mesophile
Zdroj:	Applied Biochemistry and Microbiology. 47:833-840
ISSN:	1608-3024 0003-6838
Popis:	A technology for tank biooxidation of refractory gold-bearing concentrate under variable temperature conditions has been improved: the temperature of the first of two stages was changed from 30°C to 34–36°C. Gold in this concentrate is mainly associated with sulfide minerals: arsenopyrite and pyrite, which underlies a low gold recovery (16.68%) as a result of cyanidation. To resolve the problem, an association of mesophilic acidophilic chemolithotrophic microorganisms and moderately thermophilic bacteria of the Sulfobacillus genus were used for the concentrate oxidation. The composition of the used microbial association was studied; it was shown that it depends upon temperature: at 42°C, the population of the mesophilic thiobacteria decreased, whereas that of thermophilic sulfobacilli enhanced as compared to 36°C. The accepted scheme of the process ensures a high extent of gold recovery (94.6%) within a short space of time for biooxidation (96 h).
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::33c94ef02e9d282fc777e23475a30e31 https://doi.org/10.1134/s0003683811090080 Zobrazit plný text záznamu Plný text ve formátu PDF