冷冻处理氢氧化铝污泥干燥过程水分有效扩散系数

摘要实验测定了有无进行冷冻处理的工业铝厂氢氧化铝污泥在恒温降速干燥阶段的干燥速率曲线 ,并分别给出了它们在降速干燥过程中水分的有效扩散系数及其经验关联式 ,最后对二者进行了比较和分析。显然 ,冷冻后水分有效扩散系数比冷冻前大约增加了 4 3倍 ,系由于冷冻使污泥粒子粗大化和多孔化所造成的结果。

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	唐凤翔
	张济宇

关键词：冷冻氢氧化铝污泥干燥水分有效扩散系数

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

引用本文:

唐凤翔,张济宇.冷冻处理氢氧化铝污泥干燥过程水分有效扩散系数[J]. 化学工业与工程, 2002,19(4): 286-291

TANG Feng-xiang 1,2 ,ZHANG Ji-yu 1 .Effective Moisture Diffusivity of Frozen Aluminum Hydroxide Sludge During Drying[J]. Chemcial Industry and Engineering, 2002,19(4): 286-291