作者
Hong Peng, Mengliu Ding, James Vaughan
发表日期
2018/7/10
期刊
Industrial & Engineering Chemistry Research
卷号
57
期号
31
页码范围
10292-10302
出版商
American Chemical Society
简介
This study reports on the effect of three different salts (Na2CO3, NaCl, and Na2SO4) on desilication product (DSP) precipitation in synthetic Bayer liquor. Na2SO4 had a distinct effect compared with both Na2CO3 and NaCl as only nosean-sodalite formed. With the addition of Na2SO4, both the templating effect of SO42– and subunit condensation processes appear to be involved. Na2CO3 promoted the transformation of zeolite Linde Type A (LTA) to sodalite, while NaCl did not have a significant effect on phase transformation compared with the control test. The unit cell size of zeolite LTA did not change as a function of time and anions present. The unit cell size of sodalite did significantly change as a function of salts added as follows: NaCl < control < Na2CO3 < Na2SO4. UV-Raman spectra exhibited signature peaks for sodalite with Na2CO3 and Na2SO4 which is useful since the differences in the XRD patterns for …
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