Sodium metasilicate pentahydrate is prepared from dilute lye generated in zeolite production through removing impurity by precipitation,adjusting SiO 2 content by adding water glass,and then via the processes of concentration,crystallization,separation and drying.The product quality can meet the standard and the production cost decreases by 25% compared with that of the conventional process.The new process not only eliminates dilute lye pollution,but also realizes good economic and social benefits.
【分类号】
X781
【正文快照】
合成沸石原粉生产过程中产生大量的稀碱液 ,其主要成分为 Na OH和 Si O2 ,每生产 1 t沸石原粉产生 8～ 1 0 t稀碱液。这种稀碱液经处理后 ,少部分可返回原生产系统 ,大部分因难以回收而外排 ,不仅浪费大量的碱资源 ,而且对环境造成污染。五水偏硅酸钠是生产无磷浓缩洗衣粉的主?
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