Anodic reactions of Ni3S2, ?-NiS and nickel matte

Price, D.; Davenport, William G.

doi:10.1007/bf00615093

Cited by 12 publications

(6 citation statements)

References 7 publications

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“…Furthermore, it is noted that the nickel 3d-band centers become more negative as the ratio of Ni to S decreases for the five nickel sulfides, which means that the nickel sulfide with the lower ratio should be more difficult to be oxidized. Hence, it can be concluded that the oxidation reactions of the nickel sulfides takes place sequentially while decreasing the ratio of Ni to S, which is in good agreement with the experimental findings in the oxidized leaching of heazlewoodite under acidic conditions. , …”

Section: Resultssupporting

confidence: 89%

“…Hence, it can be concluded that the oxidation reactions of the nickel sulfides takes place sequentially while decreasing the ratio of Ni to S, which is in good agreement with the experimental findings in the oxidized leaching of heazlewoodite under acidic conditions. 10,11 The calculated values of the Cu 3d-band centers in Cu 1.96 S and CuS are shown in Figure 9. Interestingly, the Cu d-band center in Cu 1.96 S (−1.37 eV) is the most positive among the A simplified illustration diagram of the Sherritt Gordon process is shown in Figure 10.…”

Section: Resultsmentioning

confidence: 99%

“…Therefore, most previous works on the leaching mechanism of Ni–Cu matte demonstrated nickel and copper being leached from the sulfides with decreasing Ni to S and Cu to S ratios, respectively. Price and Davenport studied the anodic reactions of Ni 3 S 2 , β-NiS, and a commercial nickel matte by the galvanostatic method. The results indicated that nickel sulfides lost nickel ions through a series of phase decomposition: Ni 1.5 S 2 → Ni 1.2 S 2 → NiS 2 → Ni 2+ + 2S 0 .…”

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: Resultssupporting

confidence: 89%

Section: Resultsmentioning

confidence: 99%

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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“…Oxidation of Ni 3 S 2 proceeds in two stages with formation of an intermediate compound (NiS) and subsequent formation of elementary sulfur and nickel cations. In the basis of information from [3,[10][11][12][13][14] it may be proposed that dissolution of phases does not proceed uniformly. Most intensely from the surface of particles is dissolution of nickel metal phase and oxidation of non-stoichiometric sulfide Ni 3 S 2 proceeds with formation of NiS and nickel cations [14].…”

Section: Resultsmentioning

confidence: 99%

“…In the basis of information from [3,[10][11][12][13][14] it may be proposed that dissolution of phases does not proceed uniformly. Most intensely from the surface of particles is dissolution of nickel metal phase and oxidation of non-stoichiometric sulfide Ni 3 S 2 proceeds with formation of NiS and nickel cations [14]. Therefore, there is leaching of the metal phase from the matte surface.…”

Section: Resultsmentioning

confidence: 99%

Development of Electrochemical Dissolution Method for Nickel Sulfide-Metal Alloy with Cathodic Nickel-Copper Precipitate Formation

Selivanov

Nechvoglod

2021

Metallurgist

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UDC 544.65 A method is developed for separating nickel-copper alloy by electrolysis of crushed nickel matte in sulfuric acid solution to obtain a cathode precipitate, an electrolyte solution saturated with nickel, and sulfur-sulfide sludge. A distinctive feature of this work is use of a bulk anode formed by crushed matte particles with a size of 0.5-5 mm. Nickel matte is formed by nickel phase Ni 3 S 2 and precipitates of Ni-Ni 3 S 2 eutectic 10-40 μm in size. Nickel metal also occurs at particle boundaries in the form of localized inclusions. The possibility of conducting anodic dissolution of crushed nickel matte in the form of a bulk anode and cathodic reduction of compact nickel-copper deposit in one electrolysis bath is confirmed by experiment. It is found that dissolution of metallized phase occurs most intensively from a particle surface. Electrolysis regimes are determined. With a sulfuric acid concentration in the electrolyte of 10 g/dm 3 , a bath voltage of 2.2-2.5 V, and an anode current density of 25 A/m 2 , anodic current efficiency of 87% is achieved. As a result of electrolysis of nickel matte with the parameters selected a compact nickel-copper deposit with a nickel content of more than 90% may be obtained on the cathode.

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Electrochemical and XPS studies of the surface oxidation of synthetic heazlewoodite (Ni3S2)

Buckley

Woods

1991

J Appl Electrochem

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Anodic reactions of Ni3S2, ?-NiS and nickel matte

Cited by 12 publications

References 7 publications

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

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

Development of Electrochemical Dissolution Method for Nickel Sulfide-Metal Alloy with Cathodic Nickel-Copper Precipitate Formation

Electrochemical and XPS studies of the surface oxidation of synthetic heazlewoodite (Ni3S2)

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