| 高浓度高Al13含量聚合氯化铝溶液的制备 |
| Preparation of High Concentration Polyaluminium Chloride Solutions with High Percentage of Al13 |
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| 摘要: 通过快速加碱在82 ℃下合成0.2 mol·L-1、Alb为60%～70%的低浓度高Alb聚合氯化铝(L-PAC)，在热侧温度为50～95 ℃，冷侧温度约9～12 ℃的条件下进行膜蒸馏浓缩，制备出总铝浓度在2 mol·L-1以上，Alb含量大于90%，Al13含量约为70%的高浓度高Alb含量的聚合氯化铝溶液。对膜蒸馏浓缩过程中热侧温度、PAC的碱化度和初始pH值等因素对最终聚合氯化铝溶液产品中聚铝形态分布、总铝浓度的影响进行了初步研究，发现在热侧温度低于70 ℃、碱化度为2.47、初始pH值为5.0 ± 0.2的条件下，可以得到高浓度、高Alb含量的聚合氯化铝溶液，纳米Al13形态在较高的浓度下可以存在；低温贮存条件下，高浓度PAC中Alb相当稳定。 |
| 关键词: 快速加碱合成 膜蒸馏 纳米Al13形态 高浓度PAC |
| 基金项目: |
| Abstract: High purity ( Alb/AlT>90%, Al13≈70%) and high concentration ( AlT >2.0 mol·L-1) polyaluminum chloride (PAC) solution was obtained through membrane distillation followed conventional PAC (0.2 mol·L-1) synthesis by quick base injection. Final Alb/AlT and AlT are strongly influenced by pH value and cOH-1/cAl3+ ratio (B) of the initial synthesized PAC solution and its feeding temperature in MD process. pH value of L-PAC between 5.0 ± 0.2, the percentage of Al13 in L-PAC above 70% and the feeding solution temperature below 70 ℃ are three key factors to obtain high Al13 and high AlT PAC. The results indicate that Al13 can exist in high concentration PAC solution, and the percentage of Alb maintains above 70% for a long time at low temperature. |
| Keywords: quick-injection base synthesis membrane distillation Al13 high concentration PAC |
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| 郭宇杰,栾兆坤,范彬.高浓度高Al13含量聚合氯化铝溶液的制备[J].无机化学学报,2007,23(1):63-69. |
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