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ArticleName Pressure leaching of copper-nickel converter matte in sulfuric acid media
DOI 10.17580/tsm.2018.10.04
ArticleAuthor Elfimova L. G., Karimov K. A., Kritskii A. V., Naboychenko S. S.

Ural Federal University named after the first President of Russian Federation B. N. Yeltsin, Ekaterinburg, Russia:

L. G. Elfimova, Senior Lecturer, e-mail:
K. A. Karimov, Laboratory Responsible, Engineer, e-mail:
A. V. Kritskii, PhD Student, Engineer, Lecturer Assistant, e-mail:
S. S. Naboychenko, Professor, Head of the Department “Non-Ferrous Metals Metallurgy”


A complex two-stage technology for converter matte processing using sulfuric acid pressure oxidative leaching was developed. The study was carried out on a model sample of the following composition, %: 62 Ni, 7.1 Cu, 3.7 Fe, 2.2 Co, 18 S. Process was investigated in a wide range of technological parameters (t = 85–150 oC, PO2 = 0.1–0.5 MPa). Optimal parameters at different temperature regimes are suggested. Selective leaching of Ni from converter matte should be performed at t = 85 oC, PO2 = 0.2 MPa. This made it possible to reduce the leaching period from 4 to 8 hours in case of atmospheric leaching to 1.3 to 1.5 hours at autoclave conditions, providing extraction into the solution the following components, %: 55 Ni, <1 Cu, <1 Fe. High-temperature sulfuric acid pressure oxidative leaching should be applied for most complete extraction (98–99%) of converter matte’s valuable components at t = 140 оC, PO2 = 0.4 MPa. The resulting solutions after purification from impurities are supposed to be sent to a stage of electroextraction/crystallization of nickel to produce high-quality products. Purification of leaching solutions against copper was performed using nickel sulphide, chemically precipitated by NaHS solution.The process of purification was implemented in two stages at 60 оC, changing excess coefficient from 1–5.6 (NiSsolid/Cusolution) for 60 min in a lack of free acid. At mentioned conditions — 99.9% of Cu were precipitated out of the solution; the possibility of obtaining cake with a content of 44% Cu.
This research was funded by the Russian Science Foundation (Project No. 18-19-00186).

keywords Converter matte, autoclave leaching, kinetics, purification, nickel, copper

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