1 results about "Solid phase crystallization" patented technology

The present application relates to a kind of high selectivity molecular sieve based on high-silicon low-calcium fly ash preparation and its preparation method and application, belong to molecular sieve preparation technical field.To solve the problem that molecular sieve crystallization process and high-silicon low-calcium fly ash raw material characteristics do not match, the present application provides the preparation method of high selectivity molecular sieve based on high-silicon low-calcium fly ash preparation, steps include targeted removal Fe2O3 Impurity, silicon-aluminum is activated and dissolved to obtain the silicate gel of controllable water content, using seed and mechanical force coupling direction solid phase crystallization and forming calcination obtain SiO2-Al2O3 Type molecular sieve.The present application improves the purity of molecular sieve crystal to 90~98%, the deviation of pore size distribution is reduced to below 5%, greatly improves the regularity and stability of molecular sieve crystal structure, also improves its adsorption capacity to NH4 + , CO2 And the separation coefficient of NH4 + And other cations, has wide application prospect in wastewater denitrification and carbon capture field.