Impact of MgO and K2O on Slag-Nickel Matte Equilibria
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Journal Title
Journal ISSN
Volume Title
A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
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Date
2019-12-01
Major/Subject
Mcode
Degree programme
Language
en
Pages
11
768-778
768-778
Series
JOURNAL OF PHASE EQUILIBRIA AND DIFFUSION, Volume 40, issue 6
Abstract
Slag chemistry of the direct nickel matte smelting was studied in typical industrial high-grade nickel matte smelting conditions at 1400 °C and 0.1 atm pSO2. The experimental technique used involved equilibration, quenching and direct elemental phase composition analysis by Electron Probe X-ray Microanalysis. Magnesia and potassia, a typical gangue constituent of sulfidic nickel concentrates and a common impurity of industrial grade silica flux (sand), respectively, were adopted as slag modifiers in concentrations typical to industrial operations. Their effects on oxidation degree of the nickel-copper-iron matte and equilibrium concentrations of Ni and Cu in the slag were studied as a function of oxygen partial pressure. Solubility of silica in the slag increased significantly with additions of MgO and K2O in the constrained case studied, at silica saturation. Equilibrium concentrations of Ni and Cu in the slag containing MgO and K2O were about a quarter lower compared to the pure iron silicate slag, in the entire oxygen partial pressure range studied.Description
Keywords
flash smelting, fluxing, phase equilibria, thermodynamics
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Citation
Sukhomlinov , D , Virtanen , O , Latostenmaa , P , Jokilaakso , A & Taskinen , P 2019 , ' Impact of MgO and K 2 O on Slag-Nickel Matte Equilibria ' , JOURNAL OF PHASE EQUILIBRIA AND DIFFUSION , vol. 40 , no. 6 , pp. 768-778 . https://doi.org/10.1007/s11669-019-00767-3
