K A Natarajan
Articles written in Bulletin of Materials Science
Volume 10 Issue 5 August 1988 pp 411-422
Galvanic interaction between electrically conducting minerals may affect the mineral surface and influence their flotabilities. The metallographic examinations as well as hardness measurements have been made with grinding media. Rest potential, combination potential, galvanic current and polarization studies were made to understand the probable electrochemical interaction between grinding media and chalcopyrite. The galvanic contact lowered the flotability of chalcopyrite. AES and ESCA indicated that galvanic coupling of chalcopyrite with grinding media resulted in the formation of oxy-hydroxide species of iron on the chalcopyrite surface. Scanning electron microscopy was used to study the surface morphological changes on the grinding media due to galvanic interaction with chalcopyrite.
Volume 10 Issue 5 August 1988 pp 461-465
A study was carried out to develop strains of
Volume 16 Issue 6 December 1993 pp 501-508
The applicability of a biotechnological approach for extracting gold from lean grade and refractory ores and from tailings is analysed. Microbiological as well as physicochemical characteristics of various leaching bacteria are outlined. Technological aspects of bioleaching of refractory gold-bearing concentrates in specially designed bioreactors are illustrated with emphasis on control parameters and use of metal and temperature-tolerant strains. Commercial operations prevalent across the world are detailed and the relevance of biomineral technology for augmentation of gold production in India brought out.
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