Pressure Leaching of Chalcopyrite Concentrate: Ultra-Fine Milling as Process Acceleration Method

Abstract:

Ural enrichment plants processing copper-porphyry deposits are produced chalcopyrite concentrates of the following chemical composition, %: 21.5 Cu, 0.1 Zn, 26.59 S, 24.52 Fe, 0.05 Pb, 0.04 Ni, 16.28 SiO₂ [1]. According to previous studies [2, 3, 21], such concentrates can be effectively treated using pressure oxidative leaching (POX). At temperature of 190–200 °C, partial oxygen pressure 4–6 bar and [H₂SO₄] = 15–30 g / L during 100-120 min about 98 % Cu was extracted. In this paper, an inluence of chalcopyrite concentrate preliminary grinding on efficiency of the POX stage was studied. It was found that even the finest grinding of the particle size class P₈₀ = 13 μm does not lead to significant intensification of process kinetics.

• Periodical: Solid State Phenomena (Volume 299)
• Pages: 1109-1114
• DOI: https://doi.org/10.4028/www.scientific.net/SSP.299.1109
• Online since: January 2020
• Authors: Aleksei Kritskii*, Kirill Karimov, Stanislav Naboichenko
• Keywords: Chalcopyrite Concentrate, Copper, Extraction, Hydrometallurgy, Milling, Pressure Leaching

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