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。
An equilibrium study of the reactionCaF_2(in slag)+H_2O=CaO(in slag)+2HF.between HF-H_2O gas and slags of the CaO-CaF_2 and CaO-SiO_2-CaF_2 system has been carried out with a view to evaluating activities in the said slags. Values of the ratioα_(CaO)/α_(CaF_2) are calculated from experimental data, and activities of the individual components are obtained from the α_(CaO)/α_(CaF_2) values with the modified Gibbs-Duhem equations derived by the authors for binary and ternary systems.It has been shown that the simple ratio CaO/SiO_2 can be used as a suitable criterion for the basicity of CaO-SiO_2-CaF_2 slags. The beneficial effects of a fairly basic slag for suppressing silica reduction and fluorine volatilization in blast-furnace smelting of fluorine-bearing iron ore are discussed in the light of the present results.
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| [1] | |
| [2] | |
| [3] | |
| [4] | |
| [5] | |
| [6] | |
| [7] |
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