铝阳极氧化废水浸出废旧阴极的动力学

采用水浸?酸性废水浸出两步法，水浸溶出铝电解槽废旧阴极中可溶氟化物，对难溶电解质进行了废水浸出，考察了搅拌速率、液固比、温度对浸出率的影响，并建立了反应动力学方程. 结果表明，废旧阴极酸性废水浸出过程符合未反应收缩核模型，难溶电解质的浸出控制环节为内扩散，提高反应温度、延长反应时间均能提高浸出率，浸出过程反应表观活化能为12.71 kJ/mol. 在浸出温度80℃、搅拌速率300 r/min、液固比8 mL/g的条件下浸出180 min，碳纯度可提升至95.83%. 浸出后碳粉可按比例配入原厂阴极中.

Leaching Kinetic of Spent Cathode Pot-lining with Aluminum Anodizing Wastewater

A two-step process of leaching of soluble fluoride with water and leaching of insoluble electrolyte with aluminum anodizing wastewater was adopted to deal with the spent cathode pot-lining. The effects of stirring speed, ratio of solid to liquid and temperature on the leaching rate of electrolyte were examined. And the corresponding reaction kinetics was also analyzed. The results show that leaching kinetics control link insoluble electrolyte is well interpreted with the unreacted shrinking core model under diffusion reaction control. The leaching rate of electrolyte can be improved by increasing the reaction temperature and reaction time. And the apparent activation energy of the reaction is 12.71 kJ/mol. The spent cathode pot-lining after leaching can be blended into the original cathode, and reach the specifications for resistivity, have a good economical and social benefit.