Method for preparing 4A zeolite molecular sieve with illite-containing kaolin
A technology of zeolite molecular sieve and kaolin, applied in the direction of A-type crystalline aluminosilicate zeolite, crystalline aluminosilicate zeolite, etc., can solve the problems of large difference in activation temperature, difficulty in preparing 4A molecular sieve, loss of activity, etc., and achieve product granularity The effect of uniform distribution, reduced influence, and relaxed operating conditions
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[0027] Example 1:
[0028] The method for preparing 4A zeolite molecular sieve from kaolin containing illite includes the following steps:
[0029] (1) Using illite-containing kaolin as raw material, mix the two evenly according to the mass ratio of kaolin and NaOH at 1:2, put them in a high-temperature furnace, and calcinate at 300°C for 2 hours, then cool, grind and crush to obtain alkali-fired kaolin;
[0030] (2) Weigh 20g of soda-burned kaolin, add 100ml of water, stir vigorously in a water bath at 60°C for 2h to obtain a gelled product; then heat the gelled product to 90°C and stir at low speed for 2h to obtain a crystalline product;
[0031] (3) Filter and dry the crystallized product to obtain 4A zeolite molecular sieve.
[0032] The calcium ion exchange capacity of the 4A molecular sieve prepared in this example is 311 mgCaCO 3 / g-dry basis. by figure 2 It can be seen that the synthesized product is a 4A zeolite molecular sieve with good crystallization and single crystal fo...
Example Embodiment
[0033] Example 2:
[0034] The method for preparing 4A zeolite molecular sieve from kaolin containing illite includes the following steps:
[0035] (1) Take illite-containing kaolin as raw material, mix the two evenly according to the mass ratio of kaolin and NaOH at 1:2, put them in a high-temperature furnace, and calcinate at 400°C for 2 hours, then cool, pulverize and grind to obtain alkali-fired kaolin;
[0036] (2) Weigh 20g of soda-burned kaolin, add 100ml of water, stir vigorously in a water bath at 60°C for 2h to obtain a gelled product; then heat the gelled product to 90°C and stir at low speed for 2h to obtain a crystalline product;
[0037] (3) Filter and dry the crystallized product to obtain 4A zeolite molecular sieve.
[0038] The calcium ion exchange capacity of the 4A zeolite molecular sieve prepared in this embodiment is 314 mg CaCO 3 / g-dry basis.
Example Embodiment
[0039] Example 3:
[0040] The method for preparing 4A zeolite molecular sieve from kaolin containing illite includes the following steps:
[0041] (1) Using illite-containing kaolin as raw material, mix the two evenly according to the mass ratio of kaolin and NaOH at 1:2, put them in a high-temperature furnace, and calcinate at 300°C for 2 hours, then cool, pulverize and grind to obtain alkali-fired kaolin;
[0042] (2) Weigh 20g of soda burned kaolin, add 100ml of water, stir vigorously in a water bath at 50°C for 3h to obtain a gelled product; then heat the gelled product to 70°C and stir at low speed for 3h to obtain a crystalline product;
[0043] (3) Filter and dry the crystallized product to obtain 4A zeolite molecular sieve.
[0044] The calcium ion exchange capacity of the 4A zeolite molecular sieve prepared in this embodiment is 299 mg CaCO 3 / g-dry basis.
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