A zeolite is synthesized from chemical materials and crystallization directors is introduced into system. Aqueous sodium metasilicate is coproduct from the produced mother liquid. The effect of mother liquid recirculating ratio on calcium exchangeability of 4A zeolite is investigated before and after the addition of crystallization directors. The disposal problems of mother liquid are resolved at last. High quality of 4A zeolite and aqueous sodium metasilicate are obtained. The advantages of 4A zeolite prod...