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Abstract. A model was developed to represent the biooxidation by Acidithiobacillus ferrooxidans of a refractory gold concentrate in a continuous stirred tank reactor (CSTR). The model accounts for the growth of attached and planktonic cells, their role in mineral solubilisation, and the contribution of ferric ions to the process.
The results of modeling the biooxidation of a mixed sulfidic concentrate by Thiobacillus ferrooxidans is reported here. A kinetic model, which accounts for the dissolution of sulfide matrix due to both bacterial attachment onto the mineral surface and indirect leaching, has been proposed. A comprehensive system approach is
Biooxidation is now established as a viable commercial process for oxidation of certain refractory sulfide gold concentrates. One of the challenges facing the gold industry is to lower the capital and operating costs of biooxidation and expand the range of refractory sulfide gold deposits to which it is applicable. GeoBiotics has
cyanide. This paper reviews recent progress in the use of microorganisms to oxidize the sulfidic matrix in refractory gold ores. (bio-oxidation) and to solubilize elemental gold (bioleaching). Key words: Arsenopyrite oxidation; Bioleaching; Biohydrometallurgy; Pyrite oxidation; Refractory gold ores; Thiobacillus ferrooxi- dans.
21 Jun 2007 Filling a gap in the literature, leading expert editors and top international authors present the field of biooxidation from an academic and industrial point of view, taking many examples from modern pharmaceutical research. Topics range from the application of different monooxygenases to applications in the
monitor the biooxidation of gold ores in columns at the Newmont Technical Facility in. Englewood, CO, and compared . 2.5 Applicability of Complex Resistivity to Monitor Biooxidation. 20. Chapter 3. COMPLEX programs. The CDROM also contains the entire thesis document as a *.pdf file in the thesis directory.
application of bio-oxidation, where sulphur is oxidized at different temperatures and pH levels to form sulphuric acid. Refractory sulphide ores and concentrates often consume large quantities of cyanide during leaching of gold using cyanide solution. Sulphides, elemental sulphur and many base metals react readily with
Biooxidation of arsenopyrite concentrate using BIOX® process: Industrial experience in Tamboraque, Peru Martha E. Ly Arrascue a,1 , Jan van Niekerk b,? b. a. Golder Associates Peru S.A., Peru Gold Fields Ltd., 24 St. Andrews Road, Parktown, 2193, Johannesburg, South Africa. Available online 18 May 2006. Abstract
phase bio-oxidation of ethyl alcohol, a model volatile organic compound (VOC), in a specially designed bioreactor. Ethanol was selected as a model compound representing bakery oven gas pollution. A spirally wound bioreactor module was used within which was immobilized a mixed bacterial culture from aerobic sludge.
26 Feb 2015 Full-text (PDF) | The Mouteh refractory pyrite concentrates at pulp densities of 1.5%, 3%, 4.5% and 6% were treated, using Thiobacillus ferrooxidans DSM 581 and the same bacteria adapted on the Mouteh pyritic concentrate. Compared with a non-adapted culture, use of an adapted inoculum of T. ferroo
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