| Abstract |
| The solubility of nickel in molten CaO-Fe_tO-SiO_2-MgO slag system at 1723K was measured to understand the dissolution mechanism of nickel into the slag. The dependence of solubility of nickel on oxygen partial pressure and slag basicity indicated that the nickel was dissolved as an oxide ionic species NiO^2-_2 by following reaction: ［Ni(s)+｛1/2O_2(g)+O_2-(slag)｝=NiO^2-_2］ The distribution ratio of nickel increased with the increase of (X_CaO+X_MgO)/(X_SiO_2) at a fixed Fe_tO content. However, in CaO-SiO_2-Fe_tO-MgO_satd slag system , Fe_tO is considered to work as a relatively acidic component such as FeO_2￣at composition higher than about X_FgtO=0.25. MgO is revealed to be weaker basic oxide than CaO in CaO-SiO_2-Fe_tO-MgO_satd slag system. |
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| Key Words |
| Nickel, Dissolution behavior, Distribution ratio, Basicity, FetO, Recovery |
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