Technology for Complex Processing of Electric Smelting Dusts of Ilmenite Concentrates to Produce Titanium Dioxide and Amorphous Silica

This paper presents the results of research on development a technology intended to process electric smelting dusts ilmenite concentrate with extraction silicon and titanium production products in form their dioxides. Dusts were processed for separation using ammonium fluoride method. The optimum conditions fluorination sublimation compounds from dust determined: temperature 260 °С, 6 h duration, mass ratio bifluoride 1:0.5 ÷ 0.9. degree was ~84–91%. fluorides remaining sinter carried out at 600 ± 10 °C 2 h, titanium-containing residue: 1:0.5, 99%. Iron, manganese, chromium impurities sublimate rather low degree. Pyrohydrolysis sublimes allows conversion into dioxide by 99.5% 4–5 h. Titanium rutile modification 99.8% TiO2 obtained after hydrochloric acid purification calcination. A technological scheme complex processing concentrates silica is proposed.