单阳膜电渗析处理草浆黑液碱回收的研究

Alkaline Recovery from Straw Pulping Black Liquor by Single Cation-Exchange Membrane Electrodialysis

为有效治理草浆黑液的污染 ,提高草浆黑液的综合利用率 ,本文针对碱法草浆黑液的特性 ,对单阳膜电渗析技术回收草浆黑液中残碱的可行性进行了研究。研究结果表明 :采用单阳膜电渗析技术回收草浆黑液中的碱 ,技术上是可行的 ;在本试验条件下 ,碱回收受操作电压、操作时间以及强制搅拌等因素的影响 ;综合考虑选用4 .5 V的操作电压、30 min的处理时间 ,经过处理后 ,黑液中 90 %的碱被有效回收 ,其中电流效率大于 70 % ,每吨回收碱的能耗为 4 2 0 0 k W·

In order to efficiently diminish the pollution of straw pulping black liquor (SPBL) and recover useful products from it, experimental researches have been done on the possibility of alkali recovery from SPBL by electrodialysis with single cation-exchange membrane. Results show that under appropriate operating parameters more than 90% alkali could be efficiently recovered from SPBL with 4 200 kW·h per ton alkali and more than 70% current efficiency.