FIELD: metallurgy.
SUBSTANCE: method involves chlorination of zircon concentrate, separate condensation of chlorinates, cleaning of silicon and zirconium tetrachlorides, aqueous hydrolysis of zirconium tetrachloride and deposition of zirconyl sulphate with distillation of azeotropic HCl-H2O mixture, filtration, washing and calcination of deposition so that zirconium dioxide is obtained, high-temperature vapour-phase hydrolysis of silicon tetrachloride in hydrogen-air flame so that pyrogenic silicon dioxide and HCl-bearing exhaust gases are obtained; absorption of hydrogen chloride by using azeotropic HCl-H2O mixture as absorbent, which is formed during hydrolytic separation of zirconyl sulphate.
EFFECT: invention allows multipurpose use of raw material.
1 cl, 1 dwg, 1 ex
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