Preparation of high concentration polyaluminum chloride with high content of Alb or Alc.
Preparation of high concentration polyaluminum chloride with high content of Alb or Alc.
复制标题
DOI：
10.1016/s1001-0742(08)62424-9
复制
发表时间：
2009
影响因子：
6.9
通讯作者：
Changwei Zhao;Jingbo Zhang;Z. Luan;Xianjia Peng;X. Ren
中科院分区：
文献类型：
--
作者：
Changwei Zhao;Jingbo Zhang;Z. Luan;Xianjia Peng;X. Ren
采用新型膜蒸馏浓缩法制备了高Albor Alc含量的高浓度聚合氯化铝。2.52成功制备了含88%Alc的2.38mol/LPACl 1和含61%Alc的2.38mol/LPACl 2。研究了AlCl 3、PACl 1和PACl 2三种混凝剂在不同条件下的水解行为和形态。采用铁试剂法研究了pH值和稀释倍数对铝形态分布的影响。实验结果表明，pH值对三种混凝剂的铝形态分布有显著影响。除起始稀释度对PACl 1和PACl 2的影响外，稀释度对整个稀释过程中Alb和Alc的分布影响不大。结果表明，Al的转变主要取决于其初始组成. AlCl 3是水解过程中最不稳定的混凝剂。PACl 1和PACl 2具有大量高电荷和稳定的多核铝水解产物，受水解条件的影响较小，在各种条件下都能保持较高的形态稳定性。
A novel membrane distillation concentration method was used to prepare high concentration polyaluminum chloride (PACl) with high content of Albor Alc. 2.52 mol/L PACl1with 88% Alband 2.38 mol/L PACl2with 61% Alcwere successfully prepared. Three coagulants, AlCl3, PACl1and PACl2were 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 Alband Alcdistribution in whole dilution process except the beginning for PACl1and PACl2. The results indicated that transformation of Al depends largely on their original composition. AlCl3was the most unstable coagulant among these three coagulants during hydrolysis process. PACl1and PACl2with 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.