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《Bulletin of the Chinese Ceramic Society》 2005-04
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Study on the Modification of Bentonite with Silica Sol

Yu Hua Liu Zili Zhang Xuefeng Tao Jie Chen Zhaofeng (Dept. of Materials Science and Technology,Nanjing University of Aeronautics and Astronautics,Nanjing 210016)  
With the raw material of Ca- bentonite in Tangshan, Nanjing, t he effects of the addition amounts of silica sol, pH value and baked temperature o n adsorption, suspended ability and dilatability were studied. The mechanism of the modification was analyzed by XRD. The results show that with increasing amou nt of silica sol, the adsorption and suspension increase first and then decrease , while the dilatability reduces all the time. When the mass ratio of the benton ite to silica sol is 8, the comprehensive modification effects are the best. The effects of pH value on the capability of modified bentonite are small. With the increase of temperature, the absorption and dilatability increase first and the n decrease. At the same time, the suspension improves. The results of the benton ite baked at 500℃ are the best, and the effects of the bentonite baked first a t 500℃ and then modified by silica sol are better than that of unbaked bentonite.
【Fund】: 南京航空航天大学创新基金资助项目(Y0485061)
【CateGory Index】: TD985
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