Study on the process conditions for the preparation of nano silica with high specific surface area by carbonization method
Industrial water glass was used as raw material and CO2 as precipitant,focusing on the research on the process conditions of carbonization reaction to prepare nano silica by carbonization.The average particle size and BET values of the prepared nano silica samples were taken as the main investigation in-dexes.2%TTLY+1%TTLX was screened and determined as the more suitable compound dispersant;and the carbonization condition was optimized as:the mass concentration of SiO2 11%,the temperature of car-bonization reaction60℃,the modulus of water glass3.3,and the initial content of Na2 CO3 3%.The aver-age particle size of the prepared nano silica sample was 23.43 nm,the BET values reached 422.77 m2/g,and the sample was an amorphous structure,with good particle size uniformity and dispersion.
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