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Study on nano precipitated silica from fluosilicic acid wastewater by situ modification

Xue Bing;Yang Baojun;Wang Zhonghan;Ge Lixiang;College of Chemistry and Chemical Engineering,Hefei University of Technology;  
Precipitated Si O2 was produced via chemical precipitation method using fluosilicic acid wastewater and aluminum hydroxide as raw materials,meanwhile,the in situ modification was carried out using n-butaol as surface modifier in the producing process.The influence of the adding amount of n-butyl alcohol on the dispersity and oil absorbed value(DBP)was investigated.Results demonstrated that when the adding amount of n-butyl alcohol was 3%,the average particle size(D 0.5)reduced from 32 μm to 830 nm,the specific surface area(BET) increased from 75 m2/g to 134 m2/g,and the oil absorbed value(DBP) increased from 2.2 m L/g to 3.25 m L/g.The modification enhanced the repulsion between the modified silica particles,weakened the aggregation,and improved the dispersion of modified precipitated Si O2.
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