体型化NaA分子筛的制备研究

doi:10.19964/j.issn.1006-4990.2021-0009

Abstract

Abstract:

Geopolymer with a certain strength was prepared by extracting the remaining acid-soluble slag of alumina from fly ash with one-step acid dissolution method,and the NaA Zeolite was converted via in-situ hydrothermal.The effect of various factors,such as ratio of silicon to aluminum,alkali content,liquid-solid ratio etc on the crystallinity of NaA zeolite was inves-tigated.Optimal condition for the synthesis NaA zeolite from acid-soluble residue based geopolymer was determined to be：SiO₂/Al₂O₃ molar ratio of 1.8,Na₂O/Al₂O₃ molar ratio of 1.0,and H₂O/acid-soluble residue mass ratio of 1.2,and then in 0.5 mol/L 75 mL NaOH,the NaA zeolite with single crystal phase and high crystallinity could be prepared by hydrothermal reaction at 100 ℃ and hydrothermal reaction for 8 h.The prepared NaA zeolite had an obvious cubic shape,uniform particle distribution,pore size of 0.685 nm,specific surface area of 86.75 m²/g,and compressive strength of 4.5 MPa.

Key words: fly ash, acid-soluble residue, geopolymer, NaA zeolite

CLC Number:

TQ424.25

Jia Min,Yang Lei,Wang Yongwang. Study on preparation of body-shaped NaA Zeolite[J]. Inorganic Chemicals Industry, 2021, 53(10): 98-103.

Figures/Tables 15

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References 10

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样品	w（SiO₂）	w（Al₂O₃）	w（TFe₂O₃）	w（MgO）	w（CaO）	w（Na₂O）	w（K₂O）	w（TiO₂）	烧失量	总和
1	68.46	12.98	0.28	0.23	0.47	0.03	0.19	3.98	13.48	100.1
2	68.36	12.83	0.27	0.28	0.47	0.05	0.21	4.01	13.26	99.76
平均	68.41	12.91	0.28	0.25	0.47	0.04	0.20	4.00	13.37	99.93

样品	总孔体积/（cm³·g^-1）	BET比表面积/ （m²·g^-1）	孔径/ nm	T图法微孔面积/ （m²·g^-1）	抗压强度/ MPa
地质聚合物	0.02	2.17	1.39	0.33	3.2
NaA分子筛	0.14	86.75	0.69	72.73	4.5

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National Inorganic Salts Information Center

Inorganic Acid-Base-Salt Committee of CIESC

Study on preparation of body-shaped NaA Zeolite

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