The mechanism of the sodalite-to-cancrinite phase transformation in synthetic spent Bayer liquor

Barnes, Mark C., Addai-Mensah, Jonas, and Gerson, Andrea R. (1999) The mechanism of the sodalite-to-cancrinite phase transformation in synthetic spent Bayer liquor. Microporous and Mesoporous Materials, 31 (3). pp. 287-302.

[img] PDF (Published Version) - Published Version
Restricted to Repository staff only

View at Publisher Website: http://dx.doi.org/10.1016/S1387-1811(99)...
 
1


Abstract

The precipitation of zeolite, sodalite and cancrinite and subsequent phase transformations were investigated under a variety of conditions in sodium aluminate liquor. At sufficiently high SiO2 relative supersaturation, amorphous sodium aluminosilicate and zeolite precipitated at temperatures as high as 160°C. They subsequently transformed to sodalite and finally to cancrinite. Thus the sequence of the transformation of phases is:

[Aluminosilicate species] → Amorphous phase → Zeolite (Linde A) → Sodalite → Cancrinite

It was found that sodalite did not transform to cancrinite in the absence of a liquid medium. The transformation of sodalite to cancrinite was demonstrated to involve a solution-mediated mechanism with sodalite dissolution and subsequent cancrinite precipitation. Neither the amorphous phase nor the zeolite phase precipitates at typical spent Bayer liquor SiO2 supersaturation.

Item ID: 38191
Item Type: Article (Refereed Research - C1)
Keywords: bayer process; cancrinite; phase transformation; scale; sodalite
ISSN: 1873-3093
Funders: Comalco Aluminium, Queensland Alumina, Australian Research Council (ARC)
Date Deposited: 15 Apr 2015 05:40
FoR Codes: 03 CHEMICAL SCIENCES > 0306 Physical Chemistry (incl Structural) > 030601 Catalysis and Mechanisms of Reactions @ 50%
03 CHEMICAL SCIENCES > 0306 Physical Chemistry (incl Structural) > 030605 Solution Chemistry @ 50%
SEO Codes: 84 MINERAL RESOURCES (excl. Energy Resources) > 8402 Primary Mining and Extraction Processes of Mineral Resources > 840201 Mining and Extraction of Aluminium Ores @ 100%
Downloads: Total: 1
More Statistics

Actions (Repository Staff Only)

Item Control Page Item Control Page