Method for preparing nano flyash zeolite
The technology of fly ash zeolite and fly ash is applied in the field of preparation of fly ash synthetic zeolite, and achieves the effects of saving resources, eliminating environmental damage and being cheap.
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Embodiment 1
[0017] Accurately weigh amorphous SiO 2 and Al 2 o 3 5g of power plant fly ash with contents of 45.46% and 26.38%, respectively, was uniformly mixed with 5g of NaOH, and then placed in a muffle furnace for calcination at 500°C for 1.5h to obtain clinker. Add 80ml of concentrated seawater with a salinity of 42‰ to the obtained clinker, and stir at room temperature for 24 hours to obtain silica-alumina gel. The prepared silica-alumina gel was hydrothermally reacted at 60°C for 72 hours. After the reaction, the solid-liquid separation was carried out, and the sample was washed to near neutrality and dried to obtain a sample. The obtained zeolite was NaX type zeolite, which was detected by X-ray diffraction. See the attached picture for the picture. The average particle diameter of the obtained zeolite was measured to be 77.5 nm. Ammonium acetate method measures the cation exchange capacity of product to be 394.0642mmol / 100g, figure 1 It is the X-ray diffraction pattern of th...
Embodiment 2
[0019] Accurately weigh amorphous SiO 2 and Al 2 o 3 5g of power plant fly ash with contents of 45.46% and 26.38%, respectively, was mixed with 6g of NaOH and placed in a muffle furnace for calcination at 550°C for 2 hours to obtain clinker. Add 55ml of concentrated seawater with a salinity of 76‰ to the clinker, and stir at room temperature for 24 hours to obtain a silica-alumina gel. The prepared silica-alumina gel was placed in a polyethylene-lined stainless steel reactor, sealed and crystallized under autogenous pressure at 100°C for 6 hours, then centrifuged to separate the solid from the liquid, and washed repeatedly with deionized water until the pH of the filtrate was reached. about neutral. The washed product was placed in an oven, dried at 80°C for 12 hours, and then ground into powder. X-ray diffraction characterization analysis shows that the product is a mixture of NaX type zeolite and hydroxy sodalite, and the X-ray diffraction diagram is shown in the accompa...
Embodiment 3
[0021] Accurately weigh amorphous SiO 2 and Al 2 o 3 10g of power plant fly ash with contents of 45.46% and 26.38%, respectively, was mixed with 12g of NaOH and placed in a muffle furnace for calcination at 550°C for 2 hours to obtain clinker. Add 110ml of concentrated seawater with a salinity of 88‰ to the clinker, and stir at room temperature for 24 hours to obtain a silica-alumina gel. The prepared silica-alumina gel was placed in a polyethylene-lined stainless steel reactor, sealed and crystallized under autogenous pressure at 100°C for 6 hours, then centrifuged to separate the solid from the liquid, and washed repeatedly with deionized water until the pH of the filtrate was reached. about neutral. The washed product was placed in an oven, dried at 80°C for 12 hours, and then ground into powder. X-ray diffraction characterization analysis shows that the product is hydroxy sodalite. The cation exchange capacity of the product measured by the ammonium acetate method is 2...
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