Development of a combined processing technology for low-sulfide gold-bearing ores

Koyzhanova A.K. Kenzhaliev B.K. Magomedov D.R. Abdyldaev N.N.
2021 Ore and Metals Publishing house

Obogashchenie Rud
2021 #2021 Issue 2 3 - 8 pp.

This paper presents the results of laboratory dressability studies for low-sulfide gold-bearing ores using combined processing and subsequent oxidation leaching of the resulting combined concentrate. According to the current raw materials processing circuit used at the Sekisovskoye deposit, gravity concentration experiments were first carried out using the following laboratory equipment: a Knelson KS-MD 3 centrifugal concentrator, an SKO-05 concentration table, and a two-chamber diaphragm jigging machine (i.e., OML by TsNIGRI). A significant portion (0.5 to 1.0 g/t) of the gold remains in the gravity concentration tailings. Subsequent flotation experiments for the tail-ings suggest that additional gold recovery is possible. The gold content in the final flotation tailings was in the range of 0.15–0.25 g/t. The final gold recovery in the combined process was therefore 93.7– 96.5 %. The subsequent sorption cyanidation of the concentrate according to the current processing circuit allows depositing an average of 75.0–80.0 % Au on the coal. At the same time, the residual gold content in the sorption leaching tailings is significant and amounts to 3.6–7.5 g/t. The preliminary oxidation experiments for the concentrate slurry indicate the possibility of a more complete gold recovery with subsequent leaching, including sorption leaching. The residual gold content in the cakes was measured at 0.7–1.5 g/t, which ulti-mately yielded 95–96 % recovery at the leaching stage.

Concen-trate , Gold recovery , Gold-bearing low-sulphide ore , Gravity concentration , Mineral composition , Oxidizing agent , Phase composition , Tailings

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Satbayev University, JSC «Institute of Metallurgy and Ore Benefica-tion», Almaty, Kazakhstan

Satbayev University

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