The formation of desilication products in the presence of kaolinite and halloysite – The role of surface area
A great deal of effort has been dedicated to improve the fundamental understanding of the mechanism of desilication product crystallization under Bayer process refinery conditions. Differences in the mineralogy of the reactive silica found in bauxite could change the kinetics and possibly the format...
| Main Authors: | , , , |
|---|---|
| Format: | Journal Article |
| Language: | English |
| Published: |
ELSEVIER
2021
|
| Subjects: | |
| Online Access: | http://purl.org/au-research/grants/arc/LE130100053 http://hdl.handle.net/20.500.11937/87905 |
| _version_ | 1848764948004470784 |
|---|---|
| author | Gomes, Jose F. Davies, M. Smith, P. Jones, Franca |
| author_facet | Gomes, Jose F. Davies, M. Smith, P. Jones, Franca |
| author_sort | Gomes, Jose F. |
| building | Curtin Institutional Repository |
| collection | Online Access |
| description | A great deal of effort has been dedicated to improve the fundamental understanding of the mechanism of desilication product crystallization under Bayer process refinery conditions. Differences in the mineralogy of the reactive silica found in bauxite could change the kinetics and possibly the formation pathways of the desilication product. In this work, halloysite was investigated and compared to kaolinite, which is commonly found in bauxite. Different ratios of kaolinite and halloysite were used to form desilication product and the solids formed were characterized thoroughly to determine the impact the presence of the clay had. In addition, differences in dissolution rate due to the presence of halloysite was determined. The results show that the presence of halloysite led to a faster dissolution rate of the clay overall, which can be attributed to the total specific surface area of the reactive silica source. Thus, the crystallinity of the clay was found to have limited impact. The presence of halloysite also increased the measured maximum solution [SiO2] in solution, which in turn increases the driving force for the formation of desilication product. The increase in halloysite content thus results in desilication product being observed at an earlier stage and, overall, leads to an enhanced rate of desilication product formation. |
| first_indexed | 2025-11-14T11:27:27Z |
| format | Journal Article |
| id | curtin-20.500.11937-87905 |
| institution | Curtin University Malaysia |
| institution_category | Local University |
| language | English |
| last_indexed | 2025-11-14T11:27:27Z |
| publishDate | 2021 |
| publisher | ELSEVIER |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | curtin-20.500.11937-879052023-06-07T03:00:28Z The formation of desilication products in the presence of kaolinite and halloysite – The role of surface area Gomes, Jose F. Davies, M. Smith, P. Jones, Franca Science & Technology Technology Metallurgy & Metallurgical Engineering Bayer process Desilication Reactive days Kaolin Halloysite Dissolution rate BAUXITES NANOTUBES SODALITE KINETICS A great deal of effort has been dedicated to improve the fundamental understanding of the mechanism of desilication product crystallization under Bayer process refinery conditions. Differences in the mineralogy of the reactive silica found in bauxite could change the kinetics and possibly the formation pathways of the desilication product. In this work, halloysite was investigated and compared to kaolinite, which is commonly found in bauxite. Different ratios of kaolinite and halloysite were used to form desilication product and the solids formed were characterized thoroughly to determine the impact the presence of the clay had. In addition, differences in dissolution rate due to the presence of halloysite was determined. The results show that the presence of halloysite led to a faster dissolution rate of the clay overall, which can be attributed to the total specific surface area of the reactive silica source. Thus, the crystallinity of the clay was found to have limited impact. The presence of halloysite also increased the measured maximum solution [SiO2] in solution, which in turn increases the driving force for the formation of desilication product. The increase in halloysite content thus results in desilication product being observed at an earlier stage and, overall, leads to an enhanced rate of desilication product formation. 2021 Journal Article http://hdl.handle.net/20.500.11937/87905 10.1016/j.hydromet.2021.105643 English http://purl.org/au-research/grants/arc/LE130100053 http://purl.org/au-research/grants/arc/LE140100150 http://purl.org/au-research/grants/arc/LE0775551 ELSEVIER fulltext |
| spellingShingle | Science & Technology Technology Metallurgy & Metallurgical Engineering Bayer process Desilication Reactive days Kaolin Halloysite Dissolution rate BAUXITES NANOTUBES SODALITE KINETICS Gomes, Jose F. Davies, M. Smith, P. Jones, Franca The formation of desilication products in the presence of kaolinite and halloysite – The role of surface area |
| title | The formation of desilication products in the presence of kaolinite and halloysite – The role of surface area |
| title_full | The formation of desilication products in the presence of kaolinite and halloysite – The role of surface area |
| title_fullStr | The formation of desilication products in the presence of kaolinite and halloysite – The role of surface area |
| title_full_unstemmed | The formation of desilication products in the presence of kaolinite and halloysite – The role of surface area |
| title_short | The formation of desilication products in the presence of kaolinite and halloysite – The role of surface area |
| title_sort | formation of desilication products in the presence of kaolinite and halloysite – the role of surface area |
| topic | Science & Technology Technology Metallurgy & Metallurgical Engineering Bayer process Desilication Reactive days Kaolin Halloysite Dissolution rate BAUXITES NANOTUBES SODALITE KINETICS |
| url | http://purl.org/au-research/grants/arc/LE130100053 http://purl.org/au-research/grants/arc/LE130100053 http://purl.org/au-research/grants/arc/LE130100053 http://hdl.handle.net/20.500.11937/87905 |