FIELD: inorganic substances technology. SUBSTANCE: invention relates to preparing silicon oxide compounds in the form of stable sols applied in hydroxide-free glass production and consists in acid treatment of silicon dioxide sol prepared through alkaline hydrolysis of C1-C4-alkoxysilane to pH 2-4, subsequent mixing with alloying metal salt solution, and treatment to pH 8-10 with ammonia solution with concentration not higher than 1.5 wt % and feed velocity not exceeding 0.04 ml/min per 1 ml of original solution. EFFECT: increased purity of silicon oxide sol modifications characterizing by uniform distribution of alloying admixtures in the form of stable hydroxides.
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