Hydrothermal prodn. of zeolite with low iron content - from inexpensive raw and waste materials by pptn. in presence of complexing agent, pref. tri:ethanolamine

摘要

In the hydrothermal prodn. of zeolites low in Fe from starting materials contg. Al2O3, SiO2 and alkali oxide, the zeolite is pptd. in the presence of a complexing agent, pref. triethanolamine (I) in an amt. of 0.25-0.75, esp. 0.45-0.55 wt. % w.r.t. the dry zeolite. The process is esp. useful for the prodn. of type A zeolites from relatively cheap raw and waste materials, without the need for costly measures. The prods are suitable for use in detergents without the need for additional stabilisation of the peroxide component (preborate).