Oxidation of carbon-bearing compounds and gold recovery from difficult minerals

Black shale ores and their processing products resist recovery of noble metals. The test subject are old roasted products of gold-bearing sulfide concentrate with disseminated carbonic inclusions. The research objective is the technology of cyanide-free gold recovery from difficult minerals using the Albion Process. The chemistry and grain-size composition of goldbearing roasted products are analyzed. The size distributions of gold and silver particles are found: –2.0 mm—90.81% of gold and 87.83% of silver; –0.075 mm—12.97 g/t of gold and 63.17 g/t of silver, which corresponds to 41.96% of gold and 48.54% of silver, respectively, with regard to the content of these noble metals in the initial roasted products. This discovery conditions re-milling of particles +2.0 mm in size (Albion Process) and separate leaching of particles +0.16 mm and –0.16 mm in size. The technology is developed for cyanide-free treatment of roasted products with thiocarbamide as a leaching agent. The implemented experimental research produces optimal parameters for thiocarbamide leaching: leaching duration—7 h; thiocarbamide concentration—2.0%; sulfuric acid concentration—2.5%; S : L ratio = 1.0 : 2.0; concentration of oxidizer (hydrogen peroxide)—0.45%. The result of the new process design is the enhanced efficiency of leaching owing to the synergistic effect of intensifying factors of the Albion Process, hydrogen peroxide oxidation of carbon-bearing compounds and sulfide minerals and thiocarbamide recovery of gold at 89.66%.

Keywords: old sulfide roasted products, carbon-bearing compounds, fine-dispersed gold, resistance, mineral–bearer, Albion Process, cyanide-free technology, oxidation, thiocarbamide, hydrogen peroxide.
For citation:

Shumilova L. V., Khatkova A. N., Razmakhnin K. K. Oxidation of carbon-bearing compounds and gold recovery from difficult minerals. MIAB. Mining Inf. Anal. Bull. 2023; (11):143-158. [In Russ]. DOI: 10.25018/0236_1493_2023_11_0_143.


The study was supported by the Russian Science Foundation, Project No. 22-17-00040 Development and Scientific Justification of Eco-Friendly Waste-Free Technologies for Processing Natural and Manmade Mineral Raw Materials, 2022–2023.

Issue number: 11
Year: 2023
Page number: 143-158
ISBN: 0236-1493
UDK: 622.7
DOI: 10.25018/0236_1493_2023_11_0_143
Article receipt date: 24.07.2023
Date of review receipt: 18.08.2023
Date of the editorial board′s decision on the article′s publishing: 10.10.2023
About authors:

L.V. Shumilova1, Dr. Sci. (Eng.), Assistant Professor, Professor, е-mail: shumilovalv@mail.ru, ORCID ID: 0000-0001-5991-9204,
A.N. Khatkova1, Dr. Sci. (Eng.), Professor, Professor, e-mail: alisa1965.65@mail.ru, ORCID ID: 0000-0001-6527-0026,
K.K. Razmakhnin1, Dr. Sci. (Eng.), Assistant Professor, Assistant Professor, e-mail: igdranchita@mail.ru, ORCID ID: 0000-0003-2944-7642,
1 Transbaikal State University, Chita, 672039, Russia.


For contacts:

L.V. Shumilova, e-mail: shumilovalv@mail.ru.


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