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| Leaching of Sintering Clinker from Low-grade and Iron-rich Bauxite |
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Received:May 14, 2024
Revised:June 08, 2024
Accepted:June 11, 2024
Published Online:November 17, 2024
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| DOI：doi：10.3969/j.issn.1007-7545.2024.12.006 |
| KeyWord:low-grade bauxite; clinker; leaching; alumina; sintering process |
| Author | Institution |
| HE Yi |
中国有色金属建设股份有限公司 |
| ZHOU Yan |
中国有色金属建设股份有限公司 |
| WANG Yibo |
东北大学 冶金学院 |
| PAN Xiaolin |
东北大学 冶金学院 |
| YU Haiyan |
东北大学 冶金学院 |
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| Abstract: |
| As the bauxite grade in China decreases year by year, it is difficult for Bayer method to meet the requirements of alumina production, while the advantages of sintering method are becoming increasingly prominent. Clinker leaching is a key process in the production of alumina by the sintering method, which directly affects the technical and economic indicators such as alumina leaching rate, alkali consumption and red mud settling performance. Therefore, the effects of the leaching parameters on the leaching rates of Al2O3 and Na2O during the leaching process were studied using the sintering clinker from low-grade and iron-rich bauxite. The results show that molecular ratio, caustic concentration, carbonate concentration of leaching solution, leaching temperature, time, and liquid-solid ratio can all affect the leaching performance of clinker; the increase of iron oxide content in bauxite can reduce the alumina leaching rate of sintered clinker, but the reduction is not significant. The leaching rate of Al2O3 and Na2O in the sintering clinker can reach over 85% and 95%, respectively, under the optimum leaching conditions including molecular ratio of 1.25, caustic concentration of 40 g/L, carbonate concentration of 25 g/L, leaching temperature of 80 ℃, leaching time of 20 min and liquid-solid ratio of 5. |
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