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1964•Acta Metallurgica SinicaRequires access

A STUDY OF THE EQUILIBRIUM BETWEEN HF-H_2O GAS AND SLAGS OF THE CaO-CaF_2 AND CaO-SiO_2-CaF_2 SYSTEM

Hsu Yuan-Sun, Chou Yuan-Hsi

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Abstract

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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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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Available abstract

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.

Key concepts: Slag (welding), Volatilisation, Ternary operation, Smelting, Materials science, Ternary numeral system, Fluorine, Metallurgy

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