沉淀法白炭黑颗粒在水介质中的解聚与分散研究_曹丽.pdfVIP

37 6 Vol.37 No.6 2014 11 Non-Metallic Mines November, 2014 1 1 2 1* 1 100083 2 114051 1.5 h5110%6% D50 25.2 μm 11 μm TQ127.2 A 1000-8098(2014)06-0014-04 Disaggregation and Dispersion of Precipitated Silica Particles in Water Media Cao Li 1 Cui Chenglin1 Chen Wanting2 Ding Hao1* (1 School of Materials Science and Technology, China University of Geosciences (Beijing), Beijing 100083; 2 School of Mining Engineering, University of Science and Technology Liaoning, Anshan, Liaoning 114051) Abstract Silica powder prepared by precipitation method had formed among multiple aggregates because of its particles fi ning, large surface area and interaction among the hydroxyl groups in particls surface. So, its reinforcing properties of fi lling were seriously affecting. The research on the aggregation behavior of precipitated silica particles and its disaggregation and dispersion in aqueous medium were carried out. The results showed that the wet grinding of silica in stirred mill and adding dispersant can make silica particles be effectively dispersed and disaggregaed, and D50 of silica particles reduced by a 25.2 μm to 11 μm after disaggregation and dispersion with follow conditions : grinding time 1.5 h, the ball feed ratio 51, slurry concentration of 10%, the amount of dispersant 6%. Key words precipitated silica; disaggregation and dispersion; aqueous medium; grinding 100 nm [