Development of Selective Recovery System of Lithium From Seawater Using A Novel Layer-by-Layer Adsorption Membrane of MnO_2 Type Adsorbent

新型MnO_2型吸附剂逐层吸附膜海水选择性回收系统的研制

• 批准号: 12650769
• 负责人: YOSHIZUKA Kazuharu
• 金额: $ 2.3万
• 依托单位: The University of Kitakyushu (2001)Saga University (2000)
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2000
• 资助国家: 日本
• 起止时间: 2000 至 2001
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-12650769/
• 关键词: Seawater; Lithium; Manganese Dioxide; Adsorptive Separation; Column Separation; Layer-by-layer Adsorption Membrane; Membrane Separation; リチウム吸着剤; 二酸化マンガン; 吸着かラム

For the purpose of efficient and selective separation and recovery of lithium from seawater, we have carried out : (1) Development of a novel λ type manganese dioxide (λ-MnO_2) adsorbent having quite high selectivity of lithium against sodium, (2) Performance evaluation of this λ-MnO_2 adsorbent, (3) Preparation of layer-by-layer adsorption membranes using this λ-MnO_2 adsorbent, and (4) Investigation of a selective recovery system of lithium from the seawater using membrane permeation module.As a result of this research, the followings were obtained.(1) We have successfully developed λ-MnO_2 adsorbent which high-selectively recognizes lithium ion by eluting lithium from spinel type lithium manganese dioxide with aqueous hydrochloric acid or aqueous nitric acid. This result was applied to a Japanese patent. (Patent pending 2002-46288, on February 22nd, 2002)(2) We have carried out the separation of lithium ion from sodium ion using the λ-MnO_2 adsorbent. We have obtained the selectivity of lithium/sodium of over 800 times in case of batchwise method, while 2300 times selectivity in case of column separation method. These selectivity are the best all over the world (Patent pending 2002-46288).(3) We have prepared some kinds of layer-by-layer adsorption membranes by alternately dipping a cellulose filter paper into a suspended aqueous solution of λ-MnO_2 adsorbent, an aqueous sodium alginate solution, in turn. We have observed the layer-by-layer structures of these membranes with a scanning electron microscope.(4) Using these layer-by-layer adsorption membranes, we have examined the effect of some experimental conditions on the membrane permeation rate of lithium and sodium in trial seawater in detail. We have evaluated that the lithium/sodium selectivity was greatly increased with increasing the lamination times of the membrane. However, we could not achieve effective separation of lithium compared with the column separation.

为了从海水中高效、选择性地分离和回收锂，我们进行了：(1)研制了一种对锂对钠具有较高选择性的新型λ型二氧化锰（λ- mno_2）吸附剂，(2)对该吸附剂的性能进行了评价，(3)用该λ- mno_2吸附剂制备了层状吸附膜，(4)利用膜渗透模块研究了海水中锂的选择性回收系统。研究结果如下：(1)利用盐酸或硝酸洗脱尖晶石型二氧化锰锂中的锂，研制出高选择性识别锂离子的λ-MnO_2吸附剂。这一结果申请了一项日本专利。（专利号：2002-46288，于2002年2月22日申请）(2)利用λ-MnO_2吸附剂实现了锂离子与钠离子的分离。在批量法中，锂/钠的选择性超过800倍，在柱分离法中，选择性达到2300倍。这些选择性是世界上最好的（专利申请2002-46288）。(3)将纤维素滤纸交替浸入悬浮的λ-MnO_2吸附剂水溶液和海藻酸钠水溶液中，制备了几种层状吸附膜。我们用扫描电子显微镜观察了这些膜的层层结构。(4)利用这些逐层吸附膜，详细考察了一些实验条件对试验海水中锂和钠的膜渗透率的影响。我们已经评估了锂/钠的选择性随着膜层叠次数的增加而大大增加。然而，与柱分离相比，我们无法实现锂的有效分离。

项目成果

K.Yoshizuka, K.Fukui, K.Inoue: "Selective Recovery of Lithium from Seawater Using A Novel MnO_2 Type Adsorbent"Ars Separatoria Acta. 1(印刷中). (2002)

K.Yoshizuka、K.Fukui、K.Inoue：“使用新型 MnO_2 型吸附剂从海水中选择性回收锂”Ars Separatoria Acta 1（出版中）。

K. YosnizuKa, K. fukui, K. Inoue: "Selective Recovery of Lithium from Seawater Using A Novel MnO_2 Type Adsorbent"Ars Separatoria Acta. (in press). (2002)

K. YosnizuKa、K. fukui、K. Inoue：“使用新型 MnO_2 型吸附剂从海水中选择性回收锂”Ars Separatoria Acta。