Abstract:

|Thermodynamics and the conditions of sodium silicate prepared by  micro-silica fume were study. The effects of reaction time，reaction temperature，the ratio of silicon base and the liquid-solid ratio on the leaching rate of SiO₂ and modulus were investigated. The results demonstrated that sodium silicate prepared by  micro-silica fume is feasible.  The optimum preparation condition was obtained from the dissolution experiment: reaction temperature of 180 ⁰C，the ratio of silicon base of 2. 5, the solid ratio of 10 mL/g and reaction time of 40 min.  The dissolution rate of Si0₂ and sodium silicon modulus were 77. 1% and  2. 3 respectively  under the optimum condition.

Key words: micro一silica fume, sodium silicate, dissolution rate, modulus