Preparation of high concentration polyaluminum chloride withhigh content of Alb or Alc
ZHAO Changwei , ZHANG Jingbo , LUAN Zhaokun , PENG Xianjia , REN Xiaojing
DOI:
Received December 09, 2008,Revised February 19, 2009, Accepted , Available online
Volume 21,2009,Pages 1342-1346
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A novel membrane distillation concentration method was used to prepare high concentration polyaluminum chloride (PACl) with
high content of Alb or Alc. 2.52 mol/L PACl1 with 88% Alb and 2.38 mol/L PACl2 with 61% Alc were successfully prepared. Three
coagulants, AlCl3, PACl1 and PACl2 were investigated on their hydrolysis behavior and speciation under di erent conditions. The
e ects of pH and dilution ratio on Al species distribution were investigated by ferron assay. Experimental result showed that pH had a
significant e ect on Al species distribution for the three coagulants. Dilution ratio had little e ects 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 a ected by the hydrolysis
conditions and could maintain high speciation stability under various conditions.
