摘要 High alumina slag is widely found in pyrometallurgical extractions of ferronickel, ferrochromium, and platinum group metals. The effects of MgO, Al2O3, and CaO/SiO2 on the sulfur distribution ratio between high-alumina CaO–SiO2–MgO–Al2O3 slag and carbon-saturated iron were investigated. The slag consisted of Al2O3 content in the range of 27.61–40.00 wt.%, CaO/SiO2 ratio of 0.8–1.1, and MgO content of 8–16 wt.%. The theoretical liquid areas of CaO–SiO2–MgO–Al2O3 slag were analyzed through the phase diagrams. The sulfur distribution ratio was measured via the slag–metal equilibrium technique at 1500 ºC. It was observed that the sulfur distribution ratio increased with higher MgO content and higher CaO/SiO2 ratio largely due to the increase in free O2- ions and the decrease in activity coefficient of sulfur ion in slag, but slightly decreased with the increasing Al2O3 content because of the decrease in free O2-.
Abstract：High alumina slag is widely found in pyrometallurgical extractions of ferronickel, ferrochromium, and platinum group metals. The effects of MgO, Al2O3, and CaO/SiO2 on the sulfur distribution ratio between high-alumina CaO–SiO2–MgO–Al2O3 slag and carbon-saturated iron were investigated. The slag consisted of Al2O3 content in the range of 27.61–40.00 wt.%, CaO/SiO2 ratio of 0.8–1.1, and MgO content of 8–16 wt.%. The theoretical liquid areas of CaO–SiO2–MgO–Al2O3 slag were analyzed through the phase diagrams. The sulfur distribution ratio was measured via the slag–metal equilibrium technique at 1500 ºC. It was observed that the sulfur distribution ratio increased with higher MgO content and higher CaO/SiO2 ratio largely due to the increase in free O2- ions and the decrease in activity coefficient of sulfur ion in slag, but slightly decreased with the increasing Al2O3 content because of the decrease in free O2-.
Shuai Wang,Ying Jiang,Yu-feng Guo, et al. Distribution ratio of sulfur between high alumina slag and carbonsaturated iron[J]. Journal of Iron and Steel Research International, 2023, 30(09): 1732-1742.
2023, Vol. 30 
