A kind of A zeolite molecular sieve and preparation method thereof
A zeolite molecular sieve and hydrothermal crystallization technology, applied in the direction of A-type crystalline aluminosilicate zeolite, crystalline aluminosilicate zeolite, etc., can solve the problems of low comprehensive utilization rate, exposure of lithium slag, environmental threats, etc.
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[0026] The invention provides a kind of preparation method of A zeolite molecular sieve, comprises the following steps:
[0027] Mixing raw materials for activation to obtain activated materials, the raw materials include lithium slag and sodium-containing alkaline compounds;
[0028] mixing the activated material with water to obtain a sol;
[0029] The sol is subjected to hydrothermal crystallization to obtain A zeolite molecular sieve.
[0030] In the present invention, unless otherwise specified, all raw material components are commercially available products well known to those skilled in the art.
[0031] The raw materials are mixed for activation to obtain activated materials, and the raw materials include lithium slag and sodium-containing alkaline compounds.
[0032] In the present invention, the composition of the lithium slag is preferably based on spodumene and quartz; the lithium slag preferably includes the following components in mass percentage: SiO 2 20-70%...
Embodiment 1
[0058] Mix and grind 0.715g of lithium slag and 3g of sodium hydroxide until no obvious sodium hydroxide particles are observed, add it to a closed activation reaction vessel, activate it at 140°C for 1 hour, then let it cool down to room temperature to obtain the activated material.
[0059] Transfer the activated material to a crystallization reaction container, add 5 mL of distilled water, and stir evenly for 4 hours under airtight and room temperature conditions to obtain a sol, and the molar ratio of active ingredients in the obtained sol is SiO 2 :Al 2 o 3 : Na 2 O: H 2 O=5.61:1:9.8:70.
[0060] The sol was statically crystallized at 90°C for 4 hours, the resulting system was filtered, the obtained solid was washed with water until its pH value was 9, and then dried at 120°C for 6 hours to obtain A zeolite molecular sieve (abbreviated as A1).
[0061] The XRD pattern of A1 is as follows figure 1 As shown in curve 1, by figure 1 It can be seen that the curve 1 is co...
Embodiment 2
[0065] Mix and grind 0.715g of lithium slag, 0.8g of pseudo-boehmite and 0.52g of sodium carbonate until no obvious sodium carbonate particles are observed, then add them to a closed activation reaction vessel, activate at 200°C for 1 hour, then let it cool down to room temperature , to obtain the activated material.
[0066] Transfer the activated material to a crystallization reaction vessel, add 20 mL of distilled water, and stir evenly for 4 hours under airtight and room temperature conditions to obtain a sol, and the molar ratio of active ingredients in the obtained sol is SiO 2 :Al 2 o 3 : Na 2 O: H 2 O=1.1:1:1.3:280.
[0067] The sol was statically crystallized at 90°C for 12 hours, the obtained system was filtered, the obtained solid was washed with water until its pH value was 9, and then dried at 90°C for 6 hours to obtain A zeolite molecular sieve (abbreviated as A2).
[0068] The XRD pattern of A2 is as follows figure 1 As shown in curve 2, by figure 1 It ca...
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Abstract
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