温度和电极互换频率对电解过程中聚合Al13形成的影响

聚合铝作为一种无机高分子絮凝剂,具有比传统絮凝剂如硫酸铝、氯化铁等效能优异,比有机高分子絮凝剂价格低廉等优点[1￣3]。研究表明,聚合铝絮凝剂实际上是在一定条件下控制铝的水解-聚合-沉淀过程的中间产物,其溶液除存在铝的单体及二聚体外,

Effect of Temperature and Exchanging Frequency of Electrode on Al13 Polymer Formation by Electrolysis

Al₁₃ was formed by electrolysis method, using AlCl₃ as raw material, Pt as electrodes. The effects of electrolyte temperature and the exchange frequency of the anode and the cathode on the synthesis speed of Al₁₃, the ratio of Al₁₃ in total Al and the electrolysis time needed were studied. The results show that, at the beginning of the electrolysis, the synthesis speed of Al₁₃ and the ratio of Al₁₃ in total Al increase as the electrolyte temperature rises, but decrease later; proper exchanging frequency of the electrodes could remove the passivation of the electrodes led by the aggradation of Al₁₃ on the surface of the anode, thus, enhanced the synthesis speed of Al₁₃ and the ratio of Al₁₃ in total Al, reduced the electrolysis time needed. Under the optimal conditions, the liquid product of high quality with basicity of 82.1% and Al₁₃ polymer accounted for 92.6% of total Al was successfully prepare.