The study of aluminum loss and consequent phase transformation in heat-treated acid-leached kaolin.
This study investigates the effect of Al leaching during Fe removal from kaolin to mullite. Heat-treated kaolin was obtained by heating natural kaolin at 400, 500, 600, 700, 800 and 900 °C. The heat-treated kaolin was then leached at 100 °C with 4 M, 3 M, 2 M, 1 M, 0.2 M solution of H2SO4 and 0.2 M...
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| Format: | Article |
| Language: | English |
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2011
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| Online Access: | http://psasir.upm.edu.my/id/eprint/23200/1/The%20study%20of%20aluminum%20loss%20and%20consequent%20phase%20transformation%20in%20heat.pdf |
| _version_ | 1825925306029965312 |
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| author | Mohd Salleh, Mohamad Amran Choo, Thye Foo Mahmood, Che Seman |
| author_facet | Mohd Salleh, Mohamad Amran Choo, Thye Foo Mahmood, Che Seman |
| author_sort | Mohd Salleh, Mohamad Amran |
| collection | UPM |
| description | This study investigates the effect of Al leaching during Fe removal from kaolin to mullite. Heat-treated kaolin was obtained by heating natural kaolin at 400, 500, 600, 700, 800 and 900 °C. The heat-treated kaolin was then leached at 100 °C with 4 M, 3 M, 2 M, 1 M, 0.2 M solution of H2SO4 and 0.2 M solution of oxalic acid. The dried samples were sintered to 1300 °C for 4 h at a heating rate of 10 °C min−1. X-ray diffractometry and differential thermal analysis were used to study the phase transformation of kaolin to mullite. It was found that 700 °C is the optimum preheat-treatment temperature to leach out Fe and also Al for both types of the acids used. The majority of the 4 M sulfuric acid-treated kaolins formed the cristobalite phase when sintered. On the other hand, 1 M, 0.2 M sulfuric acid and 0.2 M oxalic acid leached heat-treated kaolin formed mullite and quartz phase after sintering. |
| first_indexed | 2024-03-06T07:56:10Z |
| format | Article |
| id | upm.eprints-23200 |
| institution | Universiti Putra Malaysia |
| language | English |
| last_indexed | 2024-03-06T07:56:10Z |
| publishDate | 2011 |
| record_format | dspace |
| spelling | upm.eprints-232002015-10-20T07:13:31Z http://psasir.upm.edu.my/id/eprint/23200/ The study of aluminum loss and consequent phase transformation in heat-treated acid-leached kaolin. Mohd Salleh, Mohamad Amran Choo, Thye Foo Mahmood, Che Seman This study investigates the effect of Al leaching during Fe removal from kaolin to mullite. Heat-treated kaolin was obtained by heating natural kaolin at 400, 500, 600, 700, 800 and 900 °C. The heat-treated kaolin was then leached at 100 °C with 4 M, 3 M, 2 M, 1 M, 0.2 M solution of H2SO4 and 0.2 M solution of oxalic acid. The dried samples were sintered to 1300 °C for 4 h at a heating rate of 10 °C min−1. X-ray diffractometry and differential thermal analysis were used to study the phase transformation of kaolin to mullite. It was found that 700 °C is the optimum preheat-treatment temperature to leach out Fe and also Al for both types of the acids used. The majority of the 4 M sulfuric acid-treated kaolins formed the cristobalite phase when sintered. On the other hand, 1 M, 0.2 M sulfuric acid and 0.2 M oxalic acid leached heat-treated kaolin formed mullite and quartz phase after sintering. 2011 Article PeerReviewed application/pdf en http://psasir.upm.edu.my/id/eprint/23200/1/The%20study%20of%20aluminum%20loss%20and%20consequent%20phase%20transformation%20in%20heat.pdf Mohd Salleh, Mohamad Amran and Choo, Thye Foo and Mahmood, Che Seman (2011) The study of aluminum loss and consequent phase transformation in heat-treated acid-leached kaolin. Materials Characterization, 62 (4). pp. 373-377. ISSN 1044-5803 10.1016/j.matchar.2011.01.017 |
| spellingShingle | Mohd Salleh, Mohamad Amran Choo, Thye Foo Mahmood, Che Seman The study of aluminum loss and consequent phase transformation in heat-treated acid-leached kaolin. |
| title | The study of aluminum loss and consequent phase transformation in heat-treated acid-leached kaolin. |
| title_full | The study of aluminum loss and consequent phase transformation in heat-treated acid-leached kaolin. |
| title_fullStr | The study of aluminum loss and consequent phase transformation in heat-treated acid-leached kaolin. |
| title_full_unstemmed | The study of aluminum loss and consequent phase transformation in heat-treated acid-leached kaolin. |
| title_short | The study of aluminum loss and consequent phase transformation in heat-treated acid-leached kaolin. |
| title_sort | study of aluminum loss and consequent phase transformation in heat treated acid leached kaolin |
| url | http://psasir.upm.edu.my/id/eprint/23200/1/The%20study%20of%20aluminum%20loss%20and%20consequent%20phase%20transformation%20in%20heat.pdf |
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