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| Experiment on Pre-desilication of a Low Grade High Iron Bauxite by Roasting-Alkali Leaching |
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Received:July 16, 2024
Revised:August 23, 2024
Accepted:August 26, 2024
Published Online:February 18, 2025
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| DOI：doi：10.20237/j.issn.1007-7545.2025.01.011 |
| KeyWord:bauxite; roasting; alkaline leaching; pre-desiliconization |
| Author | Institution |
| ZHANG Xiaotian |
中国地质科学院矿产综合利用研究所 |
| XU Lu |
中国地质科学院矿产综合利用研究所 |
| LI Chao |
中国地质科学院矿产综合利用研究所 |
| LI Zelin |
中国地质科学院矿产综合利用研究所 |
| YANG Yaohui |
中国地质科学院矿产综合利用研究所 |
| XU Ying |
中国地质科学院矿产综合利用研究所 |
| JI Chengqing |
中国地质科学院矿产综合利用研究所 |
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| Abstract: |
| In view of the characteristics of low alumina, high silicon and high iron in bauxite in Yunnan, the roasting-alkali leaching pre-desiliconization process is used to obtain aluminum concentrate with high aluminum -silicon ratio. The optimal conditions are determined by investigating the effects of roasting temperature, roasting time, alkali leaching time and liquid-solid ratio on the pre-desiliconization effect. Under the optimum conditions, the aluminum-silicon ratio of low-grade bauxite is increased from 4.08 to 17.98, the silicon removal rate reaches 77.31 %, and the relative dissolution rate of alumina of pre-desiliconization concentrate is ideal to 94.56 %. Combined with Thermogravimetric Analysis-Differential Scanning Calorimetry, X-Ray Diffraction and Infrared Absorption Spectrometry, the mechanism of roasting-alkali leaching pre-desiliconization is analyzed. The results show that the improvement of the aluminum-silicon ratio of bauxite is due to the fact that the kaolin-type silicate minerals are first converted into amorphous SiO2 in roasting-alkali leaching, and then dissolved in atmospheric pressure alkali leaching. |
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