FIELD: chemical technology. SUBSTANCE: blast furnace dust at solid or suspension state is treated with sodium hydroxide or its 40% solution in the presence of water at 95 C following by filtrate treatment with mineral acid up to pH 5-6. Silicon oxide isolated shows amorphous structure, granule size is 10-45 mcm, pH value of water extract is 6.03, filled specific weight is 208.87 g/dm3, real specific weight is 1.5276 g/cm3, specific surface is 164 m2/g. Content of admixture metals - Sn, Pb, Cu, Ni, Cr, Mo is ≅ 1·10-4 wt.-%. Method is used for silicon dioxide isolation. EFFECT: improved method of product preparing. 2 cl
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