The Effect of the Nickel Sulphide Alloys Structure on Their Electrochemical Oxidation Parameters

Selivanov, E. N.; Nechvoglod, O. V.; Lobanov, V. G.

doi:10.3182/20130825-4-us-2038.00098

Cited by 6 publications

(3 citation statements)

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“…The crystal structures of Cu 1.96 S and Ni 3 S 2 , which are the sulfides mainly present in the nickel–copper converter matte, 4 and Ni 7 S 6 , NiS, Ni 3 S 4 , NiS 2 , and CuS, which are the intermediates during the oxidative leaching process, 2 were optimized and compared with their XRD patterns for validating the theoretical results. The charge distribution was obtained by Mulliken charge analysis based on the optimized structure.…”

Section: Methodsmentioning

confidence: 99%

“…3 There are a few studies on the mechanism of the selective leaching of nickel–copper converter matte from the perspective of thermodynamics and kinetics. 2 , 4 , 5 Sherritt Gordon’s leaching system (CuSO 4 –H 2 SO 4 –O 2 ), as one of the selectively oxidative leaching technologies, has been used for the extraction of Ni, Cu, and Co in some metallurgical plants. 6 − 8 The selective leaching for Ni–Cu matte based on the Sherritt Gordon process undergoes two stages.…”

Section: Introductionmentioning

confidence: 99%

“…The nickel–copper converter matte is an intermediate from smelting of sulfide or laterite ores for the recovery of nickel and generally consists of dzharleit (Cu 1.96 S), heazlewoodite (Ni 3 S 2 ), and some magnetic alloys. , Hydrometallurgical processes for the Ni–Cu matte led to products with high purity, less SO 2 emissions during refining, and shorter hold-up time of the main base metals and precious metal byproducts . There are a few studies on the mechanism of the selective leaching of nickel–copper converter matte from the perspective of thermodynamics and kinetics. ,, Sherritt Gordon’s leaching system (CuSO 4 –H 2 SO 4 –O 2 ), as one of the selectively oxidative leaching technologies, has been used for the extraction of Ni, Cu, and Co in some metallurgical plants. − The selective leaching for Ni–Cu matte based on the Sherritt Gordon process undergoes two stages . Nickel is selectively leached out in the CuSO 4 –H 2 SO 4 –O 2 solution in the first stage, while the copper sulfides formed are subsequently dissolved in the H 2 SO 4 –O 2 solution in the second stage.…”

Section: Introductionmentioning

confidence: 99%

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Electronic Structure and Oxidation Mechanism of Nickel–Copper Converter Matte from First-Principles Calculations

Tao

Zhu

et al. 2020

ACS Omega

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The structural and electronic properties of Cu 1.96 S and Ni 3 S 2 present in nickel–copper converter matte and sulfides such as CuS, Ni 7 S 6 , NiS, Ni 3 S 4 , and NiS 2 , likely existing as intermediates in the oxidative leaching of the matte, were investigated using first-principles calculations. Analyses of the total and partial density of states (DOS), with electron density and differential charge density, show that Cu–S and Ni–S bonds are of covalent character, and as the ratio of Ni/Cu to S decreases for the sulfides, Cu/Ni-3d orbital energies shift downward, while S-3p orbital energies shift upward. According to the values of their Cu/Ni-3d band centers, the oxidation activity decreases in the order Cu 1.96 S > Ni 3 S 2 > Ni 7 S 6 > NiS > Ni 3 S 4 > NiS 2 > CuS. This oxidation sequence leads to thermodynamically favorable substitution reactions between the nickel sulfides and Cu 2+ for obtaining more stable CuS, which is the theoretical basis of Sherritt Gordon’s selective leaching process.

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Section: Methodsmentioning

confidence: 99%