FIELD: technological processes.
SUBSTANCE: invention relates to production of high-purity granular silicon dioxide for further production of quartz glass. Granular silicon dioxide according to the invention has alkali metals content from 0.01 to 10.0 parts/million, content of alkali-earth metals from 0.01 to 10.0 parts/million, content of boron from 0.001 to 1.0 parts per million, content of phosphorus from 0.001 to 1.0 parts per million. Defined by nitrogen sorption pore volume is from 0.01 to 1.5 ml/g and maximum size of pores is from 5 to 500 nm. For producing such product soluble glass of traditional cheap varieties reacts in strongly acidic conditions to silicon dioxide of high-purity types, with subsequent alkaline treatment. Finally, fraction of particles with size from 200 to 1,000 mcm is separated and its sintering at temperature of at least 600 °C takes place.
EFFECT: obtaining products with low content of silanol groups through a cheaper method.
31 cl, 2 ex, 2 tbl
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