A kind of method that takes fly ash as raw material to prepare p-type molecular sieve
A technology of fly ash and molecular sieve, applied in the direction of crystalline aluminosilicate zeolite, can solve the problems of long preparation period and high production cost, and achieve the effects of reducing synthesis cost, short crystallization time and improving yield
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Embodiment 1
[0027] Grind the fly ash into fine powder, pass through a 200-mesh sieve, put it in a muffle furnace, calcinate at 800°C for 3 hours, wash it twice with water at a temperature of 75°C and a speed of 200r / min, each time 1.5 h, and then carry out solid-liquid separation of the washing liquid and fly ash, and dry the separated solid at 120°C for 5 hours for later use; the pretreated fly ash and Na 2 CO 3 The solid mass ratio is 1:1 and mixed evenly. After roasting at 800°C for 1 hour, take it out and cool it to 25°C for later use; then impregnate the roasted product with 5 mol / L HCl for 120 minutes, filter to remove insoluble matter, and obtain silicon-rich gel and crude AlCl 3 solution. Adjust crude AlCl with 5mol / L NaOH 3 pH value of the solution to 3.8, filtered to remove Fe(OH) 3 , the filtrate continued to add NaOH dropwise until the precipitation in the filtrate no longer increased, and the Mg(OH) was removed by filtration. 2 Waiting for other insoluble matter, the pH ...
Embodiment 2
[0031] Grind the fly ash into fine powder, pass through a 200-mesh sieve, place it in a muffle furnace, calcinate at 750°C for 3 hours, and wash it with water three times at a temperature of 75°C and a speed of 300r / min. 1.5h, and then carry out solid-liquid separation between the washing liquid and the fly ash, and the separated solid is dried at 120°C for 5 hours for later use; the pretreated fly ash and Na 2 CO 3 Mix evenly at a mass ratio of 1:1.5, bake at 700°C for 2 hours, take it out and cool it to 25°C for later use; then impregnate the roasted product with 4mol / L HCl for 120 minutes, filter to remove insoluble matter, and obtain silica-rich gel and crude AlCl 3 solution. Adjust crude AlCl with 4mol / L NaOH 3 pH of the solution to 4.0, filtered to remove Fe(OH) 3 , the filtrate continued to add NaOH dropwise until the precipitation in the filtrate no longer increased, and the Mg(OH) was removed by filtration. 2 Waiting for other insoluble matter, the pH value of fi...
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