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• W2889631118 abstract "In the current study, bio-oxidation tests were carried out in shaking flasks with a flotation concentrate containing the sulphides pyrite, arsenopyrite and gudmidite. The tests were performed with mesophilic microorganisms (At. ferrooxidans ) at 30 °C and also with the moderate thermophile S. thermosulfidooxidans, at 50 °C. The effects of (i) previous adaptation of the microorganisms to the concentrate, (ii) ferrous iron concentration and (iii) pulp density (2%, 4% and 6% (w/v)) on the dissolution of the sulphide were studied through arsenic extractions. S. thermosulfidooxidans was more sensitive to the pulp density in comparison to At. ferrooxidans as a reduction in sulphide oxidation was observed with the increase in the solid content to 6%. Therefore, the mesophilic strain was selected for further work, which comprised a rolling bottle experiment at 10% solids. After 40 days of bio-oxidation, the solid material was subjected to cyanidation, which revealed 85% gold extraction as compared to 21% from the original concentrate. The antimony sulphide grains in the bio-oxidized product showed similarity to what was observed in the original sample, suggesting such particles were not susceptible to the bio-oxidation process." @default.
• W2889631118 created "2018-09-27" @default.
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• W2889631118 date "2018-01-01" @default.
• W2889631118 modified "2023-09-27" @default.
• W2889631118 title "Selection of Microorganism for the Bio-Oxidation of a Refractory Gold-Concentrate with Focus on the Behaviour of Antimony Sulphides" @default.
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• W2889631118 doi "https://doi.org/10.1007/978-3-319-95022-8_147" @default.
• W2889631118 hasPublicationYear "2018" @default.
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