Preparation and Hydrolysis Behavior of High Concentration Polyaluminium Chloride Solutions with High Content of Al-b
Preparation and Hydrolysis Behavior of High Concentration Polyaluminium Chloride Solutions with High Content of Al-b
复制标题
高浓度Al-b聚合氯化铝溶液的制备及水解行为
DOI：
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发表时间：
2009-02
影响因子：
0.7
通讯作者：
Luan Zhao-Kun
中科院分区：
文献类型：
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作者：
Jia Jian-Jun;Liu Cheng-Xi;Wu Jie-Wei;Zhao Chang-Wei;Zhang Jing-Bo;Luan Zhao-Kun
The formation and characterization of high concentration polyaluminum chloride (PAC) with high content of Al-b is always researchers interests and goal. In this paper high concentration (Al-T=2.52 mol.L-1) PAC with high Al-b content (Al-b=88%) was successfully prepared by membrane distillation based on low concentration (Al-T=0.208 mol.L-1) PAC by chemical synthesis for the first time. Membrane distillation process temperature was controlled with feed temperature at 55 degrees C and distillation temperature at 20 degrees C respectively. Two new coagulants with high content of Al-b were used to make a comparison on their hydrolysis behavior and speciation in different conditions. The effects of dilution ratio, pH and dilution time on Al species distribution were investigated by Ferron Assay. Experimental result showed that the content of Al-b decreased relatively sharply only when dilution began, after the content change of Al-b was little with the increase of dilution ratio and could obtain high content (Al-b>70%) in whole dilution process. pH had some effect on Al species distribution In the alkaline region, the content of Al-a increased but the content of Al-b and Al-c decreased with the increase of pH in the alkaline region. The high content of Al-b and the low content of Al-a could maintain stability in the acidic and basic region. The effect of dilution time was relatively little, the high content of Al-b could exist a long time stability. The results indicated that two coagulants with significant amounts of highly charged and stable polynuclear aluminum hydrolysis products are less affected by the hydrolysis conditions and maintain high speciation stability under the various conditions investigated.
