矿渣/偏高岭土复合前驱体原位转化沸石的影响因素研究

doi:10.11896/cldb.22040092

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Abstract Zeolite has been regarded as a promising material with wide applications in construction, agriculture, water treatment and chemical industry owing to its unique properties, such as adsorption, filtration and catalysis. The fabrication of zeolite from alkali-activated cementitious mate-rial was known as a new technology in recent years. Generally, zeolites synthesized from metakaolin-based precursors show the problems of low mechanical strength and interface stratification. An improved method by introducing slag into metakaolin was proposed in this work. NaP-zeolite and NaA-zeolite were in-situ prepared by hydrothermal method using slag/metakaolin-based alkali-activated material as precursors. The effects of hydrothermal temperature, reaction time and slag content on crystal type, percent conversion and compressive strength of samples were investigated. The results suggested that the number of crystal types decreased with the increasing temperature, the percent conversion increased at the lower temperature and then decreased at the higher temperature. The obvious change in zeolite types was not observed in the process of prolonging reaction time, but the percent conversion increased. It must be noted that the excessive reaction time led to the dissolution of zeolite, thus the percent of zeolite conversion decreased. A moderate incorporation of slag led both the hydrothermal temperature and the reaction time for zeolite formation to decrease, strength of hydrothermal samples to increase, the phenomenon of stratification to be weaken. The suitable conditions for fabrication of zeolites were as follows: 10% of slag, hydrothermal treatment at 110 ℃ and for 20 h. The resulted samples showed the excellent performance, such as the compressive strength of 62.2 MPa and the zeolite conversion of 70%.

Key words： slag metakaolin alkali-activation synthetic condition zeolite percent conversion compressive strength

Published: 10 November 2023 Online: 2023-11-10

CLC number:

TQ172

Fund:Beijing Natural Science Foundation (2202061).

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	Articles by authors
	YE Jiayuan
	LI Guohao
	SHI Di
	REN Xuehong
	WU Chunli
	ZHANG Hongtao
	ZHANG Wensheng

Cite this article:

YE Jiayuan,LI Guohao,SHI Di, et al. In-situ Fabrication of Zeolite Using Alkali-activated Slag-metakaolin as Precursors[J]. Materials Reports, 2023, 37(21): 22040092-8.

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http://www.mater-rep.com/EN/10.11896/cldb.22040092 OR http://www.mater-rep.com/EN/Y2023/V37/I21/22040092

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