Abstract
The present research is intended to estimate efficiency of dry preconcentration of ores originated from Gurbey deposit, the Irkutsk Region, as a case study and to develop a rational flowsheet to process ores bearing free gold. The dry preconcentration of Gurbey gold-bearing ores is studied at semi-industrial equipment including DKD-300 combined impact crusher, CMBU-800 centrifugal mill, and POS-2000 pneumatic separator designed at Chersky Mining Institute of the North, SB RAS. The test specimen is subjected to two crushing cycles and four grinding cycles followed by the pneumatic separation cycle. The circulating load consisted of +12 mm fraction after DKD-300, the return mill feed is the sized product of +3 mm as well as products of classification of -3+1 mm POS-200 concentrate. The follow-on recleaning treatment of the preconcentrated products at tables, Moseley mineral analyser, magnetic separator, heavy-medium separator (tribromomethane CHBr3) yielded 23.93 g of free gold. Thereto, it is established that the complete release and recovery of gold up to 100 µm in size can be gained at POS-2000 pneumatic separator at 60% gold recovery into the primary concentrate. The present research data were used as the basis to develop the principal dry preconcentration scheme to process Gurbey ores, bearing “free” gold.
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