| 氢氧化铝基锂吸附剂从卤水中吸附锂的机理 |
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| 引用本文： | 吴志坚,郭敏,李权,刘忠.氢氧化铝基锂吸附剂从卤水中吸附锂的机理[J].盐湖研究,2018,26(3):1-6. |
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| 作者姓名： | 吴志坚 郭敏 李权 刘忠 |
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| 作者单位： | 中国科学院青海盐湖研究所中国科学院盐湖资源综合高效利用重点实验室;青海省盐湖资源化学重点实验室 |
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| 基金项目： | 青海省科学技术厅应用基础研究项目(2018-ZJ-722),青海省科学技术厅重点研发与转化计划项目(2018-GX-121),2016年青海省“高端创新人才千人计划”项目(青人才字[2016]11号)。 |
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| 摘 要： | 氢氧化铝基锂吸附剂是采用吸附法从卤水中提锂时唯一得到产业化应用的吸附剂,该吸附剂的吸附速率和吸附容量适中,选择性和循环使用性能较好,制备成本低。综合分析了吸附剂的制备、吸附和脱附性能、吸附剂吸附与脱附后的结构与形貌变化,重点分析了吸附机理。锂离子很可能是以裸离子的形式进入氢氧化铝层内的八面体空腔内而被吸附,为平衡电荷,氯离子进入层间。筛分效应和锂离子与其它离子水合作用的差异是吸附剂对锂有较好选择性的主要原因。
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| 关 键 词： | 氢氧化铝 锂吸附剂 吸附机理 水合作用 筛分效应 |
| 收稿时间： | 2018/8/29 0:00:00 |
Adsorption Mechanisms for the Recovery of Lithium from Brines Using Aluminum Hydroxide Based Adsorbent |
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| WU Zhi-jian,GUO Min,LI Quan and LIU Zhong.Adsorption Mechanisms for the Recovery of Lithium from Brines Using Aluminum Hydroxide Based Adsorbent[J].Journal of Salt Lake Research,2018,26(3):1-6. |
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| Authors: | WU Zhi-jian GUO Min LI Quan and LIU Zhong |
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| Institution: | Key Laboratory of Comprehensive and Highly Efficient Utilization of Salt Lake Resources,Qinghai Institute of Salt Lakes, Chinese Academy of Sciences, Xining, 810008, China;Key Laboratory of Salt Lake Resources Chemistry of Qinghai Province,Xining, 810008, China,Key Laboratory of Comprehensive and Highly Efficient Utilization of Salt Lake Resources,Qinghai Institute of Salt Lakes, Chinese Academy of Sciences, Xining, 810008, China;Key Laboratory of Salt Lake Resources Chemistry of Qinghai Province,Xining, 810008, China,Key Laboratory of Comprehensive and Highly Efficient Utilization of Salt Lake Resources,Qinghai Institute of Salt Lakes, Chinese Academy of Sciences, Xining, 810008, China;Key Laboratory of Salt Lake Resources Chemistry of Qinghai Province,Xining, 810008, China and Key Laboratory of Comprehensive and Highly Efficient Utilization of Salt Lake Resources,Qinghai Institute of Salt Lakes, Chinese Academy of Sciences, Xining, 810008, China;Key Laboratory of Salt Lake Resources Chemistry of Qinghai Province,Xining, 810008, China |
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| Abstract: | Aluminum hydroxide based adsorbent is the only one adsorbent which has been used for the production of lithium salts from brines using adsorption method. This adsorbent has a moderate adsorption rate and adsorption capacity, and it has a relatively good selectivity and recycle performance with a low preparation cost. Based on the analysis of the preparation of the adsorbent, adsorption and desorption properties, and structure and morphology changes of the adsorbent after adsorption and desorption, the adsorption mechanisms were emphatically discussed. Lithium cations are probably adsorbed as the naked cations, entering the octahedral cavities within the aluminum hydroxide layers. In order to balance the charge, chloride anions enter into the interlayers of the aluminum hydroxide layers. Sieve effect and hydration differences between lithium cations and the other cations are the key factor for the good selectivity of the adsorbent. |
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| Keywords: | Aluminum hydroxide Lithium adsorbent Adsorption mechanism Hydration Sieve effect |
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