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| ACTIVITY OF MgO IN MOLTEN SLAGS WITH CaF_2 BASE |
| CHEN Chongxi; ZHAO Wenxiang (Beijing University of Iron and Steel Technology) |
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Cite this article:
CHEN Chongxi; ZHAO Wenxiang (Beijing University of Iron and Steel Technology). ACTIVITY OF MgO IN MOLTEN SLAGS WITH CaF_2 BASE. Acta Metall Sin, 1983, 19(1): 1-8.
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Abstract An investigation was made of the activity of MgO, α_(MgO), in molten electrorefining slags with CaF_2 base of the concentrations N_(Al_2O_3)≤0.16, N_(MgO)≤0.30 and N_(CaO)≤0.30 at 1600 and 1650℃, and of the influence of MgO, Al_2O_3 and CaO contents on it as well. The diagrams of iso-activity for systems CaF_2-MgO-Al_2O_3 and CaF_2-MgO-CaO-Al_2O_3 (N_(Al_2O_3)=0.07) were constructed. It was found that the α_(MgO) increases rapidly with the increase of N_(MgO). However, the behaviour of Al_2O_3 is quite changeable, at 1600℃ it decreases violently the activity coefficient of MgO, γ_(MgO); at 1650℃ acts as one to increase γ_(MgO) if N_(MgO)<0.15 and is insensitive to α_(MgO) in the limits of N_(MgO) about 0.16. In the present study, α_(MgO) referred to solid as a function of component contents in the system CaF_2-MgO-Al_2O_3 at 1600 and 1650℃ may be expressed as follows: At 1600℃ α_(MgO)=2.89N_(MgO)-2.07N_(MgO)~2+0.081N_(MgO)~3-(55.23N_(Al_2O_3)-644.3N_(Al_2O_3)~2+2427N_(Al_2O_3)~3)N_(MgO)-56.12N_(Al_2O_3)N_(MgO)~2+373.1N_(Al_2O_3)N_(MgO)~3 At 1650℃ α_(MgO)=0.898N_(MgO)+2.73N_(MgO)~2-2.42N_(MgO)~3+(60.8N_(Al_2O_3)-120.8N_(Al_2O_3)~2+350N_(Al_2O_3)~3)N_(MgO)-77.5N_(Al_2O_3)N_(MgO)~2+ 1036N_(Al_2O_3N_(MgO)~3 In system CaF_2-MgO-CaO-Al_2O_3(N_(Al_2O_3)=0.07), CaO is found to be increasing γ_(MgO) at 1600℃ and varied its effect at 1650℃ with various N_(MgO). The expres-sion of α_(MgO) at 1650℃ in this system may be shown as: α_(MgO)= 4.67N_(MgO)-30.7N_(MgO)~2+70.1N_(MgO)~3- N_(CaO)(17.5N_(MgO)-208.4N__(MgO)~2+521N_(MgO)~3)
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Received: 18 January 1983
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