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| Phase Transformation of Diasporic Bauxite-Sodium Hydroxide System during Heating Process |
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Received:September 30, 2015
Revised:October 08, 2015
Accepted:October 09, 2015
Published Online:February 23, 2016
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| DOI：10.3969/j.issn.1007-7545.2016.03.004 |
| KeyWord:diaspore bauxite; saturated NaOH solution; roasting; phase transformation |
| Author | Institution |
| LE THI QUYNH XUAN |
昆明理工大学冶金与能源工程学院 |
| JU Shaohua |
昆明理工大学冶金与能源工程学院 |
| PENG Jinhui |
微波能工程应用及装备技术国家地方联合工程实验室 |
| WANG Shixing |
微波能工程应用及装备技术国家地方联合工程实验室 |
| ZHOU Liexing |
云南省特种冶金重点实验室 |
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| Abstract: |
| Effects of roasting temperature and NaOH addition on phase transformation of diaspore-sodium hydroxide system were investigated. Heating performance, phase transformation, and microstructure of roasting ore were comparatively analyzed with DTA-TG XRD and SEM. The results show that AlOOH is not changed to a large extent with low roasting temperature and a small amount of NaOH dosage, and kaolinite and muscovite reacts with NaOH to form zeolites, sodalite, and cancrinite respectively. Raising temperature facilitates conversion of zeolite and sodalite into cancrinite. Increasing NaOH dosage promotes reaction of AlOOH with NaOH to form sodium aluminate phases. When temperature rises to 500 ℃ above, AlOOH is decomposed into Al2O3. |
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