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Reaction behavior of silicon-rich diasporic bauxite with ammonium sulfate during roasting
The separation of Al from the silicon-rich diasporic bauxite is of great significance in alumina production. Herein, we proposed a low-temperature ammonium sulfate roasting-water leaching process to extract aluminum from silicon-rich diasporic bauxite. Parameters including roasting temperature, dosa...
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Published in: | Journal of Central South University 2022, Vol.29 (1), p.22-31 |
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Main Authors: | , , , , , , |
Format: | Article |
Language: | English |
Subjects: | |
Citations: | Items that this one cites Items that cite this one |
Online Access: | Get full text |
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Summary: | The separation of Al from the silicon-rich diasporic bauxite is of great significance in alumina production. Herein, we proposed a low-temperature ammonium sulfate roasting-water leaching process to extract aluminum from silicon-rich diasporic bauxite. Parameters including roasting temperature, dosage of ammonium sulfate, roasting time, and particle size of ore were investigated. Under the condition of roasting temperature of 400 °C, roasting time of 5 h, ammonium sulfate dosage of 2.5 times of the theoretical value and ore particle size of 80–96 µm, more than 98% leaching rate of aluminum was obtained. The phase transformation and mechanism during the roasting process were revealed by using X-ray diffraction, thermogravimetric analysis, differential thermal analysis, and scanning electron microscope methods. The diaspore and kaolinite phases in the silicon-rich diasporic bauxite could react with ammonium sulfate to form corresponding sulfates (NH
4
)
3
Al(SO
4
)
3
, NH
4
Al(SO
4
)
2
and Al
2
(SO
4
)
3
. The proposed technology could provide an effective method for the direct and separation of aluminum from silicon-rich diasporic bauxite. |
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ISSN: | 2095-2899 2227-5223 |
DOI: | 10.1007/s11771-022-4917-9 |