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Chemcial Industry and Engineering 2002, Vol. 19 Issue (4) :286-291    DOI:
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Effective Moisture Diffusivity of Frozen Aluminum Hydroxide Sludge During Drying
TANG Feng-xiang 1,2 ,ZHANG Ji-yu 1 (1.Institute of Chemical Engineering and Technology,Fuzhou University,Fujian Fuzhou 350002,China; 2.Institute of Coal Chemistry,Chinese Academia Sinica,Shanxi Taiyuan 030001,China)
(1.Institute of Chemical Engineering and Technology,Fuzhou University,Fujian Fuzhou 350002,China; 2.Institute of Coal Chemistry,Chinese Academia Sinica,Shanxi Taiyuan 030001,China

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Abstract Based on the determined falling-rate drying curves of both unfrozen and frozen aluminum hydroxide sludge from aluminum fabricating plants,the corresponding moisture diffusivity for these two kinds of sludge is estimated and correlated with temperature and moisture content respectively.The comparison between the moisture diffusivity for both kinds of sludge is also carried out in this investigation.The results show that the moisture diffusivity of frozen aluminum hydroxide sludge increases about 4 3 times as compared with unfrozen aluminum hydroxide sludge.That is caused by the increase in the diameter and porosity of sludge particles in the freezing process.
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Received 2002-07-15; published 2002-07-15
Cite this article:   
TANG Feng-xiang 1,2 ,ZHANG Ji-yu 1 .Effective Moisture Diffusivity of Frozen Aluminum Hydroxide Sludge During Drying[J]  Chemcial Industry and Engineering, 2002,V19(4): 286-291
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