Formation of Na-A and -X zeolites from waste solutions in conversion of coal fly ash to zeolites

被引：119

作者：

Tanaka, H ^{[1
]}

Sakai, Y ^{[1
]}

Hino, R ^{[1
]}

机构：

[1] Shimane Univ, Interdisciplinary Fac Sci & Engn, Dept Mat Sci, Matsue, Shimane 6908504, Japan

来源：

MATERIALS RESEARCH BULLETIN | 2002年 / 37卷 / 11期

关键词：

amorphous materials; inorganic compounds; X-ray diffraction; electron microscopy; crystal structure;

D O I：

10.1016/S0025-5408(02)00861-9

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Na-A and -X zeolites were synthesized from waste solutions in conversion of coal fly ash (Fa) to zeolite. The amorphous SiO2 and Al2O3 of Fa were completely dissolved to form Po, Pt, and Pc type zeolites in NaOH solutions at 85 C. Only 24% of Si4+ eluted from Fa were converted to the zeolites and the remaining waste solutions contained high Si4+ concentrations. When molar ratio SiO2/Al2O3 of the waste solutions was modified at 1.0 less than or equal to SiO2/Al2O3 2.0 by addition of NaOH-NaAlO2 solutions and the solutions were agied at 85 C, a single phase of Na-A zeolite was formed. The Na-X zeolite was formed at SiO2/Al2O3 > 2.5 and its crystallinity was increased with increasing the SiO2/Al2O3 ratio, whereas the crystallinity of Na-A zeolite was decreased. At SiO2/Al2O3 = 7.3, a single phase of Na-X zeolite was produced. (C) 2002 Elsevier Science Ltd. All rights reserved.

引用

页码：1873 / 1884

页数：12

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