The Study on Sulfur and Nickel Distribution Behavior of Nickel between Fe-Ni alloy and MgO-FeO-SiO2 Slag System
The dissolution behavior of nickel in the MgO-SiO2-FeO slag system was investigated by using the thermodynamic equilibrium technique. Nickel distribution ratio between molten MgO-SiO2-FeO slag and molten Fe-Ni alloy at 1773 K and 1873 K was measured to understand the dissolution mechanism of nickel into the slags. The dependence of oxygen partial pressure and basicity on the distribution of nickel was investigated. Nickel distribution behavior between slag and Fe-Ni alloy increased with higher oxygen partial pressure showing a dependence of 1/2. For basic slag systems near the olivine saturated composition, the nickel distribution ratio increased with higher basicity showing a slope of 1 and for acidic slag systems near the cristobalite saturated composition, the nickel distribution ratio decreased with higher basicity showing a slope of -1. Thus dissolution behavior of nickel in the MgO-SiO2-FeO slag system showed two independent mechanisms similar to that found in the CaO-SiO2-CaF2 system. The distribution ratio of sulfur between the (CaO)-MgO-FeO-SiO2 slag and Fe-Ni alloy at high temperature was also investigated to understand the refining ability of Ferronickel smelting slag by chemical equilibrating technique. The experimental results indicated that sulfide capacity in terms of the slag composition of MgO-FeO-SiO2 slag and temperature was increased with increasing FeO and CaO contents as well as temperature. And FeO is considered to work as relatively basic component in this slag system that has low basicity. Comparing the effect of components of slag on sulfide capacity, CaO and FeO is considered to be more effective basic oxide than MgO in MgO-FeO-SiO2 slag system while the effect of FeO on sulfide capacity was gradually retarded with increasing CaO. The effect of CaO on MgO solubility of slag and the relationship between sulfide and Ni oxide capacities was also discussed.
nickel distribution ratio basicity amphoteric behavior sulfide capacity
Ki Deok Kim Hyung Sub Eom Eun Jin Jung Wan Wook Huh Dong Joon Min
Department of Materials Science and Engineering, Yonsei University, Seoul 120-749, Korea RIST (Research Institute of Industrial Science & Technology), Gangwon Province, 210-340, Korea
国际会议
Ninth International Conference on Molten Slags,Fluxes and Salts(第九届国际熔渣、溶剂与熔盐学术会议 MOLTEN12)
北京
英文
1-8
2012-05-27（万方平台首次上网日期，不代表论文的发表时间）