The invention belongs to the technical fields of
molecular sieve and preparation method thereof, and specifically relates to a process for synthesis of a ZSM-5
molecular sieve by using a hydrothermal method and taking natural minerals diatomite and kaolin as raw materials for providing all aluminum sources and
silicon sources required for synthesis of the ZSM-5, and particularly, relates to a method for low-cost synthesis of the ZSM-5-5
molecular sieve. The natural minerals diatomite and kaolin as the raw materials provide all the
silicon sources and aluminum sources required for synthesis of the ZSM-5 molecular
sieve, the use of any chemical
silicon or aluminum products are not required, the ways of diatomite low temperature liquid alkali dissolving and kaolin low temperature
solid alkali melting are provided for achieving low temperature high-efficiency activation of
natural mineral silicon and aluminum 'nutrients', at the same time,
inert impurities in the raw materials are removed, and
crystallinity and purity of a crystallized product are improved. The method has obvious advantages in aspects of expanding the range of molecular
sieve synthetic raw materials, increasing the added value of the
natural mineral products, reducing the production cost of molecular
sieve, reducing the environmental
pollution and the like.