Preparation method and application method of coal gangue-based sodium ion type molecular sieve based on alkali fusion method

The invention relates to a preparation method and an application method of a coal gangue-based sodium ion type molecular sieve based on an alkali fusion method. Coal gangue and sodium hydroxide which are free of heavy metal pollution in the Ordos region are mainly utilized, and the coal gangue-based sodium ion type molecular sieve is prepared through the alkali fusion method steps of pretreatment, alkali fusion, aging, crystallization, washing, drying and the like on the coal gangue on the premise of not adding silicon and aluminum sources; the molecular sieve has an octahedral crystal structure, a large specific surface area and a large pore volume, and has a high adsorption capacity and an adsorption effect on heavy metals; an adsorption test on Cd (II) and Cu (II) is verified, the adsorption rate of Cd (II) and Cu (II) can reach 90% or above, an important basis is provided for preparing the molecular sieve by using coal gangue, and an important way is provided for comprehensive utilization of coal gangue.