Preparation of high concentration polyaluminum chloride with high content of Al_b or Al_c  

作　　者：ZHAO Changwei ZHANG Jingbo LUAN Zhaokun PENG Xianjia REN Xiaojing 

机构地区：[1]Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China. [2]School of Chemical and Environment Engineering, China University of Mining and Technology, Beijing 100083, China

出　　处：《Journal of Environmental Sciences》2009年第10期1342-1346,共5页环境科学学报（英文版）

基　　金：supported by the National Natural Science Foundation of China (No 50708109, 20577061,40673003);the National Hi-Tech Research and Develop-ment Key Program (863) of China (No 2007AA06Z339);the Special Fund from the State Key Laboratory of Environmental Aquatic Chemistry (No 09Y02ESPCR,09Z01ESPCR)

摘　　要：A novel membrane distillation concentration method was used m prepare high concentration polyaluminum chloride （PAC1） with high content of AID or Ale. 2.52 mol/L PACl1 with 88% Alb and 2.38 mol/L PACl2 with 61% Ale were successfully prepared. Three coagulants, AlCl3, PACl1 and PACl2 were investigated on their hydrolysis behavior and speciation under different conditions. The effects of pH and dilution ratio on Al species distribution were investigated by ferron assay. Experimental result showed that pH had a significant effect on Al species distribution for the three coagulants. Dilution ratio had little effects on Alb and Alc distribution in whole dilution process except the beginning for PACl1 and PACl2. The results indicated that transformation of Al depends largely on their original composition. AlCl3 was the most unstable coagulant among these three coagulants during hydrolysis process. PACl1 and PACl2 with significant amounts of highly charged and stable polynuclear aluminum hydrolysis products were less affected by the hydrolysis conditions and could maintain high speciation stability under various conditions.A novel membrane distillation concentration method was used m prepare high concentration polyaluminum chloride （PAC1） with high content of AID or Ale. 2.52 mol/L PACl1 with 88% Alb and 2.38 mol/L PACl2 with 61% Ale were successfully prepared. Three coagulants, AlCl3, PACl1 and PACl2 were investigated on their hydrolysis behavior and speciation under different conditions. The effects of pH and dilution ratio on Al species distribution were investigated by ferron assay. Experimental result showed that pH had a significant effect on Al species distribution for the three coagulants. Dilution ratio had little effects on Alb and Alc distribution in whole dilution process except the beginning for PACl1 and PACl2. The results indicated that transformation of Al depends largely on their original composition. AlCl3 was the most unstable coagulant among these three coagulants during hydrolysis process. PACl1 and PACl2 with significant amounts of highly charged and stable polynuclear aluminum hydrolysis products were less affected by the hydrolysis conditions and could maintain high speciation stability under various conditions.

关 键 词：polyaluminum chloride membrane distillation Al species distribution 

分 类 号：TQ324.4[化学工程—合成树脂塑料工业] TS262.5[轻工技术与工程—发酵工程]