A kind of hydrothermal synthesis method of 4a molecular sieve
A hydrothermal synthesis and molecular sieve technology, applied in the direction of A-type crystalline aluminosilicate zeolite, crystalline aluminosilicate zeolite, etc., can solve the problems of low solid phase yield, low crystallinity and purity of 4A molecular sieve
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Embodiment 1
[0078] A kind of hydrothermal synthesis method of 4A molecular sieve, comprises the steps:
[0079] (1) Initial slurry preparation: crush natural kaolin with a kaolinite content of 93.5wt% through a 100-mesh sieve, and roast at 700°C for 3 hours to obtain roasted powder, which is silicon and aluminum raw materials; select roasted powder 20kg, add 50kg24wt % sodium hydroxide aqueous solution, stirring and mixing to obtain initial slurry;
[0080] (2) Aging treatment: aging the initial slurry prepared in step (1) at room temperature for 48 hours to obtain aged slurry;
[0081] (3) Initial crystallization: put the aged slurry obtained in step (2) in an insulated stirring mill for mechanochemical treatment by ball milling, the speed of the agitator is 150r / min, raise the temperature of the system and keep it at 90-100°C, Keep warm for 60 minutes;
[0082] (4) Late stage crystallization: Under the condition of 150r / min ball milling, make the temperature 80~100℃, reduce the ball m...
Embodiment 2
[0090] A kind of hydrothermal synthesis method of 4A molecular sieve, comprises the steps:
[0091] (1) Initial slurry preparation: crush natural kaolin with a kaolinite content of 93.5wt% through a 100-mesh sieve, and roast at 700°C for 3 hours to obtain roasted powder, which is silicon and aluminum raw materials; select roasted powder 20kg, add 40kg10wt % sodium hydroxide aqueous solution, stirring and mixing to obtain initial slurry;
[0092] (2) Aging treatment: aging the initial slurry prepared in step (1) at room temperature for 48 hours to obtain aged slurry;
[0093] (3) Initial crystallization: put the aged slurry obtained in step (2) in an insulated stirring mill for mechanochemical treatment by ball milling, the speed of the agitator is 150r / min, raise the temperature of the system and keep it at 90-100°C, Keep warm for 20 minutes;
[0094] (4) Later stage crystallization: Under the condition of 150r / min ball milling, slowly add 7kg of solid sodium hydroxide to th...
Embodiment 3
[0100] A kind of hydrothermal synthesis method of 4A molecular sieve, comprises the steps:
[0101] (1) Preparation of initial slurry: crush coal-series kaolin with a kaolinite content of 91.6wt% through a 100-mesh sieve, and roast at 850°C for 2 hours to obtain roasted powder, which is silicon and aluminum raw materials; select roasted powder 25kg, add Add 100 g of water reducer sodium hexametaphosphate to 40 kg of 15 wt % sodium hydroxide aqueous solution, stir and mix to obtain initial slurry;
[0102] (2) Aging treatment: aging the initial slurry prepared in step (1) at room temperature for 24 hours to obtain aged slurry;
[0103] (3) Initial crystallization: place the aged slurry obtained in step (2) in an insulated stirring mill, perform mechanochemical treatment, raise the temperature of the system and keep it at 80-95°C, keep it warm for 1 hour, and perform initial crystallization;
[0104] (4) Later stage crystallization: under the condition of 600r / min ball milling,...
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