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利用CaF_2的高溫水解反应平衡,測定了1450℃时CaO-CaF_2系和CaO-SiO_2-CaF_2系熔渣中CaO对CaF_2的活度比,并按变通的Gibbs-Duhem方程式計算了二元系中CaO及CaF_2的活度和三元系中SiO_2的活度。試驗結果表明,将CaF_2視为中性,而用簡单的CaO/SiO_2比表示含氟高炉渣的碱度是合理的。从三元系中等SiO_2活度线可以看出提高碱度可大大降低SiO_2的活度,因而可以对渣中氧化硅的还原和氟的揮发起有效的抑制作用。
The activity ratio of CaO to CaF_2 in CaO-CaF_2 and CaO-SiO_2-CaF_2 slag was measured at 1450 ℃ by using the equilibrium of high-temperature hydrolysis reaction of CaF_2. The CaO content of CaO in the binary system was calculated according to the modified Gibbs-Duhem equation And the activity of CaF 2 and the activity of SiO 2 in the ternary system. The experimental results show that CaF 2 is regarded as neutral, and it is reasonable to use a simple CaO / SiO 2 ratio to indicate the basicity of the fluorine-containing blast furnace slag. It can be seen from the ternary system activity line of medium SiO 2 that increasing alkalinity can greatly reduce the activity of SiO 2 and thus effectively restrain the reduction of silicon oxide and the volatilization of fluorine in the slag.