| 基于动态降温结晶工艺的盐湖卤水镁锂分离研究 |
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| 引用本文： | 张成卓,成怀刚,李琳琳,薛芳斌,李恩泽.基于动态降温结晶工艺的盐湖卤水镁锂分离研究[J].盐湖研究,2023,31(1):59-66. |
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| 作者姓名： | 张成卓 成怀刚 李琳琳 薛芳斌 李恩泽 |
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| 作者单位： | 山西大学资源与环境工程研究所,山西 太原 030006;山西大学资源与环境工程研究所,山西 太原 030006;青海大学化工学院,青海 西宁 810016 |
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| 基金项目： | 国家自然科学基金(U20A20149,51874194,21908137)；山西省研究生教育创新项目(2021Y139) |
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| 摘 要： | 青海盐湖卤水锂资源储量丰富，高镁锂比卤水存在镁锂分离难的问题。基于非平衡动态降温过程中不同盐组分结晶行为存在差异的原理，开展了强制分离高镁锂比卤水的研究，考察了卤水镁锂比、降温速率、流体状态和卤水温度对镁锂分离效果的影响，并分析了结晶过程中镁锂分离的介稳性特点。结果表明，通过非平衡动态降温结晶析出MgCl2·6H2O,可以实现卤水脱镁和镁锂分离，当降温速率为-1.25℃/min、卤水温度在70℃至50℃范围内，镁锂比在10∶1～80∶1时，镁锂分离因子最高可达到1.876,结晶的MgCl2·6H2O纯度最高为99.42%。非平衡动态降温结晶工艺相较于经典的盐田工艺，最多可将锂损失率从模拟盐田工艺的38.39%降至7.56%。该工艺为盐湖卤水镁锂分离提供了一条新的思路，也为后续高纯锂盐的制备奠定了基础。
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| 关 键 词： | 盐湖卤水 分离 非平衡 动态 结晶 |
| 收稿时间： | 2021/12/9 0:00:00 |
| 修稿时间： | 2022/1/3 0:00:00 |
Study on Separation of Magnesium and Lithium from Salt Lake Brine Based on Dynamic Cooling Crystallization Process |
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| ZHANG Cheng-zhuo,CHENG Huai-gang,LI Lin-lin,XUE Fang-bin,LI En-ze.Study on Separation of Magnesium and Lithium from Salt Lake Brine Based on Dynamic Cooling Crystallization Process[J].Journal of Salt Lake Research,2023,31(1):59-66. |
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| Authors: | ZHANG Cheng-zhuo CHENG Huai-gang LI Lin-lin XUE Fang-bin LI En-ze |
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| Institution: | Institute of Resources and Environmental Engineering, Shanxi University,Institute of Resources and Environmental Engineering, Shanxi University,Institute of Resources and Environmental Engineering, Shanxi University,Institute of Resources and Environmental Engineering, Shanxi University,Institute of Resources and Environmental Engineering, Shanxi University |
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| Abstract: | Qinghai salt lake brine has rich lithium resources, and high-magnesium-lithium has the problem of difficult separation of magnesium-lithium than brine. Based on the principle of the difference in crystallization behavior of different salt components during the non-equilibrium dynamic cooling process, this paper carried out a study on the forced separation of brine with a high magnesium-lithium ratio, and investigated the effect of brine magnesium-lithium ratio, cooling rate, fluid state and brine temperature on the separation of magnesium-lithium The effect of the effect, and the metastability characteristics of magnesium-lithium separation during the crystallization process are analyzed. The results show that by non-equilibrium dynamic cooling and crystallization to precipitate MgCl2·6H2O, brine can be demagnesium and magnesium-lithium separation. When the cooling rate is -1.25°C/min, the brine temperature is in the range of 70°C to 50°C, the magnesium-to-lithium ratio is 10:1 At -80:1, the maximum separation factor of magnesium and lithium can reach 1.876, and the maximum purity of crystallized MgCl2·6H2O is 99.42%. Compared with the classic salt field process, the non-equilibrium dynamic cooling crystallization process can reduce the lithium loss rate from 38.39% of the simulated salt field process to 7.56% at most. This process provides a new idea for the separation of magnesium and lithium from salt lake brine, and also lays a foundation for the subsequent preparation of high-purity lithium salts. |
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| Keywords: | salt lake brine separation non-equilibrium dynamic crystallization |
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