Preparation of 4A Molecular Sieve from Coal Gasification Slag and Its Adsorption Performance

Abstract

Abstract: In order to solve the difficult problem of comprehensive utilization of coal gasification slag (CGFS), 4A molecular sieve was synthesized with CGFS as raw material by an alkali fusion-water leaching-hydrothermal method. Under the conditions that the molar ratio of water to sodium (n(H₂O)/n(Na₂O)) is 80 and the molar ratio of silicon to aluminum (n(SiO₂)/n(Al₂O₃)) is 2, the effects of reaction time, hydrothermal temperature and precursor aging time on the phase structure and microstructure of prepared 4A molecular sieve were investigated. The phase transformation and synthesis mechanism for activated CGFS-P1 molecular sieve-4A molecular sieve were proposed. Meanwhile, the adsorption performance of the prepared 4A molecular sieve for Cu²⁺ in the solution was tested by using copper sulfate solution to simulate industrial wastewater containing heavy metal ions. The results show that 4A molecular sieve with uniform size and well crystallization could be prepared at 100 ℃ for 12 h. The adsorption of Cu²⁺ by 4A molecular sieve mainly occurrs in the initial 10 min and the adsorption rate reaches 69.7%. The saturated adsorption rate reaches 97.3% in 90 min and the saturated adsorption capacity is 196.4 mg/g. It is indicated that the prepared 4A molecular sieve exhibits good adsorption performance, which provides the theoretical and experimental foundation for the high value-added utilization of CGFS.

Key words: coal gasification slag, alkali fusion, hydrothermal reaction, 4A molecular sieve, Cu²⁺ adsorption, crystallization mechanism, adsorption performance

CLC Number:

XU Qibin, NIU Xiangli, CHEN Tingting, CHEN Yuxin, LI Yang, ZHANG Hua, NI Hongwei. Preparation of 4A Molecular Sieve from Coal Gasification Slag and Its Adsorption Performance[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2023, 42(6): 2251-2261.

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