Extraction of gold from an Indian low-grade refractory gold ore through physical beneficiation and thiourea leaching
2003; Elsevier BV; Volume: 68; Issue: 1-3 Linguagem: Inglês
10.1016/s0304-386x(02)00197-4
ISSN1879-1158
AutoresD.S. Ramachandra Murthy, Vinod Kumar, K.V. Rao,
Tópico(s)Extraction and Separation Processes
ResumoThe work carried out on the processing of a low-grade and refractory gold ore using thiourea is presented. Direct leaching of the "as-received" ore with thiourea has yielded only 16% gold extraction. Starting with ore containing 1.4 g/t of gold, it has been possible to generate a sulphide concentrate with 6.1 g/t of gold by physical beneficiation of the ore through froth flotation. Thiourea leaching of this flotation concentrate after pressure, pre-oxidation has resulted in gold extraction of 98%, with an overall gold recovery of 74%. Pressure oxidation was found to be slightly superior to roasting for the pre-oxidation of the refractory gold ore/concentrate.
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