Subchloride Waste-Free Sublimation of Sillimanite Concentrates
R. A. Zakirov1, O. G. Parfenov2
1 Institute of Chemistry and Chemical Technology
2 Institute of Chemistry and Chemical Technology, parf@icct.ru
Abstract
The possibilities for sublimation of silicon and aluminium - basic components of refractory aluminium silicates - to gas phase have been demonstrated by way of thermodynamic computations and experiments with minerals of sillimanite tribe. The proposed method is founded on alternate action of chlorine on aluminium silicates in the presence of carbon-bearing reductant and aluminium subchloride as a reductant, with the results that low-boiling salts of aluminium and silicon are produced. This method was demonstrated to be economically feasible by direct expenditure of electric energy on the return of aluminium subchloride to the cycle solely in the case of joint production of aluminium and silicon from minerals of sillimanite tribe.
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