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| Phases Control of One-step Roasting Process of α-Spodumene for Lithium Extraction by CaO and Na2SO4 |
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Received:March 25, 2024
Revised:April 10, 2024
Accepted:April 12, 2024
Published Online:August 08, 2024
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| DOI：doi：10.3969/j.issn.1007-7545.2024.09.005 |
| KeyWord:spodumene; extraction of lithium; low temperature roasting; mineral phase reconstruction |
| Author | Institution |
| LÜ Manyu |
郑州大学生态与环境学院 |
| SUN Zhenhua |
中国科学院过程工程研究所 |
| XING Peng |
中国科学院过程工程研究所 |
| WANG Chenye |
中国科学院过程工程研究所 |
| LI Huiquan |
中国科学院过程工程研究所 |
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| Abstract: |
| The current process of lithium extraction from spodumene primarily employs high temperature transition - sulfation roasting method, which usually requires transformation roasting and sulfation roasting at about 1 100 ℃, which has issues such as high energy consumption and long process flow. One-step low temperature roasting method with CaO and Na2SO4 as mixed additives to extract lithium from α-spodumene was proposed, and the amount of additives and roasting temperature were further optimized. The results indicate that the leaching rate of lithium is 94.97% under the conditions including roasting temperature of 900 ℃, roasting time of two hours, and a mixture of 50% Na2SO4 and 6% CaO. Using XRD, FT-IR, SEM-EDS and other methods, the ore-phase regulation mechanism of the mixed additives on the one-step roasting process of lithium extraction from α-spodumene is clarified as follows: At low temperature, CaO can react with α-spodumene to form anorthite and quartz, which destroys the stable structure of spodumene and reduces the transition temperature of α-spodumene. Na2SO4 further reacts with quartz and spodumene to form albite and soluble NaLiSO4. The process significantly reduces the roasting temperature of spodumene, realizes the short-range and efficient extraction of lithium, and has significant application value. |
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