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2014年 第8卷 第1期

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《环境科学与工程前沿（英文）》 >> 2014年 第8卷 第1期 doi: 10.1007/s11783-013-0493-4

Effect of seawater salinity on the synthesis of zeolite from coal fly ash

1. Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China; 2. Graduate School, Chinese Academy of Sciences, Beijing 100049, China; 3. School of Environment, Tsinghua University, Beijing 100084, China; 4. State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing 100029, China

发布日期： 2014-02-01
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A novel method for the synthesis of zeolite was developed in this paper. The synthesis was carried out by hydrothermal activation after alkali fusion and coal fly ash (CFA) was used as raw material with seawater of different salinities. Seawater salinity was varied from 32 to 88 for zeolite crystallization during the hydrothermal process. The results show that seawater salinity plays an important role in zeolite synthesis with CFA during hydrothermal treatment. The products were a mixture of NaX zeolite and hydroxysodalite; seawater salinity more strongly affected the crystallization than the type and chemical composition of the zeolites. The yield of CFA transformed into zeolite gradually rose with the increase in salinity, reaching a transformation rate of 48%–62% as the salinity increased from 32 to 88, respectively. The proposed method allows for the efficient disposal of by-products; therefore, the application of seawater in zeolite synthesis presents promising economic and ecological benefits.

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