ELECTROLYSIS OF GRANULATED COPPER-NICKEL MATTE
https://doi.org/10.17073/0021-3438-2018-5-16-22
Abstract
The paper justifies the method of processing sulfide-metal melts including their granulation and subsequent electrolysis of granules. High-speed crystallization ensures ultrafine structure formation and stabilizes non-stoichiometric high-temperature phases leading to an increase in the reactivity of granules during subsequent hydrometallurgical processing. Copper powder was isolated at the cathode, and sulfur-sulfide slime (NiS–Сu9S5–Cu7S4–S) was isolated at the anode in a sulfuric acid solution during the electrolysis of granular copper-nickel matte (Cu : Ni = 1 : 1). The influence of current density and process duration on electrolysis parameters and the quality of copper powder isolated was estimated. Sulfur sulfide slime (containing more than 50 % sulfur) forms a passivation layer on granule surfaces, which prevents reagent feeding and reaction product removal from the interaction zone. Anodic current density of up to 100 A/m2 ensures metal conversion into a solution and copper powder (PMS-1 grade) formation at the cathode. Powder is represented by 1 to 100 μm particles of dendritic and fragmented shapes. High-quality copper powder isolation was achieved when saturating electrolyte with nickel to 28,0 g/dm3 . In this case, anode efficiency was 37 % with respect to sulfur, and cathode efficiency was 92,8 % for copper. The process is recommended for copper and nickel separation when processing sulfide-metal alloys. Copper content of in the solution during electrolysis ranged from 0,4 to 2,0 g/dm3.
About the Authors
O. V. Nechvoglod
Institute of Metallurgy of the Ural Branch of the Russian Academy of Sciences (IMET UB RUS)
Russian Federation
Russian Federation
Cand. Sci. (Tech.), research scientist of the laboratory of pyrometallurgy of non-ferrous metals,
620016, Yekaterinburg, Amundsen str., 101
S. V. Sergeeva
Institute of Metallurgy of the Ural Branch of the Russian Academy of Sciences (IMET UB RUS)
Russian Federation
Russian Federation
Cand. Sci. (Tech.), research scientist of the laboratory of pyrometallurgy of non-ferrous metals,
620016, Yekaterinburg, Amundsen str., 101
K. V. Pikulin
Institute of Metallurgy of the Ural Branch of the Russian Academy of Sciences (IMET UB RUS)
Russian Federation
Russian Federation
research assistant of the laboratory of pyrometallurgy of non-ferrous metals,
620016, Yekaterinburg, Amundsen str., 101
E. N. Selivanov
Institute of Metallurgy of the Ural Branch of the Russian Academy of Sciences (IMET UB RUS)
Russian Federation
Russian Federation
Dr. Sci. (Tech.), head of the laboratory of pyrometallurgy of non-ferrous metals,
620016, Yekaterinburg, Amundsen str., 101
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Review
For citations:
Nechvoglod O.V., Sergeeva S.V., Pikulin K.V., Selivanov E.N. ELECTROLYSIS OF GRANULATED COPPER-NICKEL MATTE. Izvestiya. Non-Ferrous Metallurgy. 2018;(5):16-22. (In Russ.) https://doi.org/10.17073/0021-3438-2018-5-16-22
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