CaO-FeO-MgO-SiO2四元渣系活度模型及应用.

In order to study the thermodynamic conditions of iron resources recycled from oxidized molten nickel slag, a calculation model of apeo activity in CaO-FeO-MgO-SiO2 slag system was established，which was used to investigate the influence of binary basicity and MgO content on aFe0 activity in the slag at 1 723 K. The thermodynamic possibilities of oxidation of Fe to Fe3O4 in nickel slag at 1 723 K were analyzed, and the experimental verification was carried out. The results show that the activity o£ aFeo increases first and then decreases with the increase of the basicity, and reaches the maximum value at basicity of 1. 1. When the oxidation temperature was above 1 723 K, the K& of Fe3O4 being further oxidized to Fe2 O3 was less than 0，which could inhibit the formation of Fe2O3. After the molten oxidation process for nickel slag, the iron component is mainly enriched in the magnetite phase, and the average particle size of the magnetite particles is about 52 pm，which paves a way for magnetic separation of the magnetite phase in nickel slags. [ABSTRACT FROM AUTHOR]