DEVELOPMENT AND STUDY OF A TECHNOLOGY FOR PROCESSING COPPER ELECTROLYTE SLIMES WITH PLATINUM GROUP METALS RECOVERY

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SRT 3(3)
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Published: 06.10.2025
DOI: https://doi.org/10.70769/3030-3214.SRT.3.3.2025.28
Keywords:
copper electrolyte slime, anode slime, platinum group metals, hydrometallurgy, leaching, decoppering, sulphatization, precious metals, selective precipitation, concentrate, extraction, efficiency, waste processing

Main Article Content

Akmalov, M.L.
Engineer-technologist, JSC "Uzbek Technological Metals Combine", Almalyk, Uzbekistan
Larionov, S.V.
Deputy Chairman of the Board - Acting Chief Engineer of JSC “Almalyk MMC”, Almalyk, Uzbekistan
Yusupov, U.S.
Deputy Minister of Mining Industry and Geology of the Republic of Uzbekistan, Doctor of Technical Sciences, Tashkent, Uzbekistan
Mamirova, Z.A.
Laboratory assistant at JSC “Almalyk MMC”, Almalyk, Uzbekistan

Abstract

This article presents the results of the development of a hydrometallurgical technology for the comprehensive processing of copper anode slimes with the aim of extracting platinum group metals (PGMs). The study proposes a stepwise process scheme: acid decoppering, oxidative leaching with selective extraction of gold and selenium, ammonia leaching of silver, and alkali-oxidative treatment of the residue for tellurium separation and PGM concentrate production. The optimal conditions were experimentally determined as follows: decoppering of the slime with 10% H₂SO₄ and 0.5–1.0% NaNO₂ at 25–30°C; intensive oxidative leaching at 80–90°C in the presence of sodium nitrite for the transfer of Au and Se into solution; precipitation of Au with SO₂ and Se with Na₂SO₃ from solution; dissolution of Ag in 25% ammonia solution; roasting of the residue with NaOH and NaNO₃ at ~300°C followed by water leaching. It is shown that this approach provides extraction yields of >99% Cu, ~95% Au, ~90% Ag, and >98% Pt and Pd. The resulting collective noble metals concentrate contains ~70–80% PGMs and can be used as raw material for the subsequent separation of individual platinum group metals. The novelty of the work lies in the development of a waste-free process without high-temperature smelting: high PGM recovery is achieved through hydrometallurgical operations while reducing losses to dust and gases. The research results demonstrate the promise of implementing the proposed technology at copper processing plants to increase the recovery of platinum group elements and to obtain highly selective PGM concentrates.

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Article Details

Issue

Vol. 3 No. 3 (2025)

Section

Mining, Metallurgy, and Manufacturing Industry
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How to Cite

Akmalov, M. L., Larionov, S. V., Yusupov, U. S., & Mamirova, Z. A. (2025). DEVELOPMENT AND STUDY OF A TECHNOLOGY FOR PROCESSING COPPER ELECTROLYTE SLIMES WITH PLATINUM GROUP METALS RECOVERY. Digital Technologies in Industry, 3(3), 61-72. https://doi.org/10.70769/3030-3214.SRT.3.3.2025.28

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