扩散渗析法应用于石煤提钒酸浸液预处理研究

采用扩散渗析法对石煤提钒酸浸液进行预处理,考察料液(酸浸液)流速、水料(水/酸浸液)流速比对处理后液pH、硫酸回收率、水反渗率、离子截留率的影响。研究表明,在料液流速12mL/min、水料流速比1.0~1.1的最佳条件下,预处理后的酸浸液pH由0.04提高到1.0,硫酸回收率为71.12%,水反渗率为14.95%,钒截留率为95.50%。主要杂质离子铝、铁、镁、钾、氟、磷、硫的截留率分别为99.04%、97.37%、98.01%、85.12%、98.33%、91.16%、69.96%。扩散渗析预处理实现了酸浸液pH的提升,同时回收酸可以重新利用。

Application of Diffusion Dialysis Method to Pretreat Stone Coal Acid Leaching Solution

Diffusion dialysis method was applied to pretreat stone coal acid leaching solution. Effects of feed flow rate, flow rate ratio (water/feed) on pH value of dialysate, sulfuric acid recovery, water reverse osmosis rate, and ions rejection were investigated. The results show that the optimum operation conditions include feed flow rate of 12 mL/min and flow rate ratio of water to feed of 1.0~1.1. Under the optimum operation conditions, pH value of acid leaching solution pretreated by diffusion dialysis rises to 1.0 from 0.04, sulfuric acid recovery is 71.12%, water reverse osmosis rate is 14.95%, and vanadium rejection is 95.50%. Rejection of impurity ions, such as Al, Fe, Mg, K, F, P, S is 99.04%, 97.37%, 98.01%, 85.12%, 98.33%, 91.16%, and 69.96% respectively. pH value of acid leaching solution is improved by pretreatment of diffusion dialysis. Recovered acid can be reused.