hydrothermal synthesis method uses water glass, sodium metaaluminate and sodium hydroxide as raw materials. For the preparation of dilute water glass solution and the preparation of sodium metaaluminate solution, please refer to 3A molecular sieve.
Mix water glass, sodium metaaluminate and sodium hydroxide according to a certain molar ratio (generally A12 O3:SiO2:Na2O:H2O:1:3.66:4.8:181), add orienting agent, and control the temperature above 40 ℃ for reaction. After strong stirring reaction, the gel is formed, and the temperature is raised to (102±2)℃, and the molecular sieve crystals are formed at this temperature, which is filtered and washed, add calcium chloride for ion exchange (exchange degree 70%), then filter, wash, dry, and obtain crystal powder, and add a binder (such as clay) to the crystal powder to make strips or globular and microglobular, Under certain conditions, burn and activate to prepare 10X molecular sieve.