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《Journal of Beijing University of Chemical Technology(Natural Science Edition)》 2006-05
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Dispersion and rheology studies for the nano alumina trihydroxide aqueous suspension

LIANG Lei GUO Fen CAO Ya-peng(Research Center of the Ministry of Education for High Gravity Engineering and Technology, Beijing University of Chemical Technology,Beijing 100029,China)  
Alumina trihydroxide(ATH) particles size from the carbonation precipitation is in the nano-range and its water demand reaches 200g and its aqueous suspension with 12.9% mass fraction is a very sticky time-dependent Non-Newtonian fluid.The laser particle analyzer and a rheology method are used to select dispersants for the suspension.The rheologies of the suspension wtih/without dispersant are investigated and the result show that polyelectrolyte change viscosity a lot,while the reagents of the low molecular weight have little effect.Added with optimum dispersants,the suspension turns into the Newtonian fluid and its viscosity decreases more than three orders of magnitude and can be calculated with modified Einstein formulation.The mentioned phenomena are discussed and a concentrated aqueous suspension with 60% mass fraction is obtained.The dispersant improves the suspension rheology so much that the ATH and its derivates' equipment investment and energy cost reduce greatly during its production and application processes.The rheology method can be used to select the dispersant and to research the agglomeration quickly and accurately.
【Fund】: 国家“863”计划(2002AA302605)
【CateGory Index】: O614.31
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