Leaching of gold-containing ores with application of oxidation activators

A.T. Abubakriev; А.К. Коizhanova; D.R. Маgomedov; М.B. Еrdenova; N.N. Abdyldaev

doi:10.31643/2019/6445.23

Authors

A.T. Abubakriev “Institute of Metallurgy and Ore Beneficiation” JSC
А.К. Коizhanova “Institute of Metallurgy and Ore Beneficiation” JSC
D.R. Маgomedov “Institute of Metallurgy and Ore Beneficiation” JSC
М.B. Еrdenova “Institute of Metallurgy and Ore Beneficiation” JSC
N.N. Abdyldaev “Institute of Metallurgy and Ore Beneficiation” JSC

DOI:

https://doi.org/10.31643/2019/6445.23

Keywords:

gold-bearing rock, leaching, gravity concentrate, gravity tailings, recovery, oxidation activator.

Abstract

The Article presents the results of studies conducted to process gold-bearing rocks from one of the fields in Kazakhstan. We studied the phase chemical and mineral composition of the ore using semi-quantitative X-ray fluorescent, chemical (assay), electron raster and rational (phase) analyzes. Wefound that the test sample contained 1.4 g/t Au and 0.14 g/t Ag. The granulometric analysis showed that the main gold (36.51%) was concentrated in a class of -2.5 +1.25 mmsize, with 1.42 g/t gold content. The main components of the initial sample composition were quartz 38.9%, albite 20.3%, pyrite 5.8%. we studied thegravity recovery possibility of gold-bearing ore using laboratory equipment, i.e. Knelson KS-MD 3 centrifugal concentrator. We obtained a gold-containing concentrate with 6.04 g/t gold content on a centrifugal concentrator with extraction of 52.65%, and 0,82 g/t gold in gravity tailingsunder the one-stage recovery flow sheet. We determined the optimal leaching parameters for the recovery products (gravity concentrate and gravity tailings) using various oxidation activators. The gold recovery degree was 77.3%with direct gravity concentrate cyanidation, and 85.7%with preliminary oxidation using calcium hypochlorite increasing the gold recoverydegree by 8.4%, when leaching the gravity tailingsusing calcium hypochlorite -73.1%, sodium peroxide - 75.6%, Ascor oxidation activator (AS-45102) - 71.9%.

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Author Biographies

A.T. Abubakriev, “Institute of Metallurgy and Ore Beneficiation” JSC

Senior Engineer, Special Hydrometallurgy Methods Laboratory named after Beisembaev B.B.ofInstitute of Metallurgy and Ore Beneficiation JSC, Almaty, Kazakhstan.

А.К. Коizhanova , “Institute of Metallurgy and Ore Beneficiation” JSC

PhD in Technical Sciences, Chief Researcher, Head of Special Hydrometallurgy Methods Laboratory named after Beisembaev B.B.ofInstitute of Metallurgy and Ore Beneficiation JSC, Almaty.

D.R. Маgomedov , “Institute of Metallurgy and Ore Beneficiation” JSC

Senior Engineer, Special Hydrometallurgy Methods Laboratory named after Beisembaev B.B.ofInstitute of Metallurgy and Ore Beneficiation JSC, Almaty, Kazakhstan.

М.B. Еrdenova, “Institute of Metallurgy and Ore Beneficiation” JSC

Junior Research Associateof Special Hydrometallurgy Methods Laboratory named after Beisembaev B.B.ofInstitute of Metallurgy and Ore Beneficiation JSC, Almaty, Kazakhstan.

N.N. Abdyldaev , “Institute of Metallurgy and Ore Beneficiation” JSC

Engineer, Special Hydrometallurgy Methods Laboratory named after Beisembaev B.B.of Institute of Metallurgy and Ore Beneficiation JSC, Almaty, Kazakhstan.

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