Impact of MgO and K2O on Slag-Nickel Matte Equilibria
A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
JOURNAL OF PHASE EQUILIBRIA AND DIFFUSION, Volume 40, issue 6
AbstractSlag 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.
flash smelting, fluxing, phase equilibria, thermodynamics
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