碱熔-水热法制备煤矸石基4A分子筛

oal gangue is rich in SiO? (52.3 wt%) and Al?O? (34.7 wt%), and its silicon-aluminum molar ratio is highly consistent with the ideal composition of 4A molecular sieve. In this study, through the collaborative pretreatment process of low-temperature oxidation (400℃, 2 h) and hydrochloric acid leaching (6 mol/L, 80℃), the content of Fe?O? was reduced from 7.8 wt% to 1.1 wt%, significantly reducing the interference of impurities. High-crystallinity 4A molecular sieve was successfully synthesized by alkali fusion-hydrothermal method under the optimized conditions of calcination at 750℃ for 2 h, aging at 60℃ for 2 h, and crystallization at 95℃ for 6 h. The prepared sample has high crystallinity, presents a cubic morphology, and is a good heavy metal adsorbent. This study provides efficient adsorbent materials and technical references for the resource utilization of coal gangue and the treatment of copper-containing wastewater.