关键词:

硅酸钠溶液, 氧化硅, 分步碳分

Abstract:

By using industrial sodium silicate solution as raw material，high purity SiO₂ powder was successfully synthesized by the split-step carbonation method.The relations between pH value of end point and the removal percentage of impurity at the first carbonation and the purity and yield of product SiO₂ powder at the second carbonation were studied.The SiO₂ powder was characterized by using XRD，SEM，IR and composition analysis.The results showed that when the pH value of end point at the first carbonation was 10.9，the purity of SiO₂ prepared was up to 99.9%.The SiO₂ powder synthesized was amorphous with regular sphere shape，uniform size and no reunion.The reaction mechanism was also discussed.

Key words:

硅酸钠溶液, 氧化硅, 分步碳分