膨润土生产洗涤剂用4A沸石中废酸液处理工艺是很重要和关键的一部分，关系到生产成本及环保达标。该研究提供了三种废酸液处理方法并研究了铵明矾法回收废酸液中铝的原理及工艺条件，并给出物料衡算和经济核算。“,”Reclaiming spent acid is a key step in the manufacture process of detergent-used zeolite 4A from Montmorillonite because it relates not only to the manufacture cost of zeolite 4A product but also to the environment problem. This paper presented with three reclaiming methods and stressed on the method in which the aluminium was reclaimed in form of ammonium alum. It involved the principle. the effect of conditions, and the material and economic balance. This method proved to be reasonable ,effective and economical.