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| A STUDY OF THE EQUILIBRIUM BETWEEN HF-H_2O GAS AND SLAGS OF THE CaO-CaF_2 AND CaO-SiO_2-CaF_2 SYSTEM |
| HS(?) YUAN-SUN; CHOU YUAN-HSI; LIU FU-LIEN(Institute of Metallurgy; Academia Sinica) |
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Cite this article:
HS(?) YUAN-SUN; CHOU YUAN-HSI; LIU FU-LIEN(Institute of Metallurgy; Academia Sinica). A STUDY OF THE EQUILIBRIUM BETWEEN HF-H_2O GAS AND SLAGS OF THE CaO-CaF_2 AND CaO-SiO_2-CaF_2 SYSTEM. Acta Metall Sin, 1964, 7(1): 24-31.
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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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Received: 18 January 1964
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