摘要
为了提高地下盐卤中锂资源利用率,文章采用共沉淀法制备了铁掺杂改性的锂—铝层状双氢氧化物(Li-Fe-Al LDH),并通过选择醋酸纤维素粘结剂和碳酸氢钠致孔剂对改性吸附剂粉末造粒,成功制备了高比表面积的Li-Fe-Al LDH颗粒(GLDH)。结构表征结果表明:所制备的吸附剂粉末具有高纯度LDH晶体结构,而在致孔剂作用下获得颗粒化的GLDH的比表面积为44.449 m^(2)/g,内部平均孔径归为介孔(~18.34 nm),这有助于Li^(+)在吸附剂颗粒内快速扩散。然后,采用地下卤水进行吸附工艺探究,研究结果表明:在相同固液比条件下,随着温度的升高,吸附容量逐渐增加;在相同温度下,随着固液比的增加,吸附容量也逐渐增加,且在提锂过程中吸附动力学更符合伪二级动力学模型,表明卤水中Li^(+)在LDH中吸附遵循化学吸附过程。
In order to improve the utilization efficiency of lithium resources in the under⁃ground brine,in this article,a co-precipitation method is employed to prepare Fe^(3+)-doped modi⁃fied lithium-aluminum layered double hydroxide(Li-Fe-Al LDH).The modified adsorbent pow⁃der was successfully granulated by using acetic acid cellulose as binder and sodium bicarbonate as pore-forming agent,resulting in high specific surface area Li-Fe-Al LDH particles(GLDH).Structural characterization confirmed that the adsorbent powder possessed a high-purity LDH crys⁃tal structure,and the granulated GLDH achieved a specific surface area of 44.449 m^(2)/g,with an in⁃ternally averaged pore size classified as mesoporous(~18.34 nm),facilitating rapid diffusion of Li^(+)within the adsorbent particles.Subsequently,the adsorption process is investigated the under⁃ground brine.The results indicated that the adsorption capacity gradually increased with the rise in temperature under the same solid-liquid ratio conditions.Under the same temperature,an increase in the solid-liquid ratio also led to a gradual increase in adsorption capacity.Moreover,in the lithium extraction process,the pseudo-second-order kinetic model obeys the adsorption kinetics,suggesting that the Li^(+)adsorption in the LDH in brine follows a chemical adsorption process.
作者
张奥
田桂英
葛俊杰
李瑞林
李园园
张建平
程鹏高
唐娜
ZHANG Ao;TIAN Guiying;GE Junjie;LI Ruilin;Li Yuanyuan;ZHANG Jianping;CHENG Penggao;TANG Na(College of Chemical Engineering and Materials Science,Tianjin University of Science and Technology,Tianjin Key Laboratory of Brine Chemical Engineering and Resource Eco-utilization,Tianjin 300457,China)
出处
《盐科学与化工》
CAS
2024年第8期40-44,共5页
Journal of Salt Science and Chemical Industry
基金
国家自然科学基金重点支持项目(U20A20148)
国家重点研发计划(2022YFC2904005)。
关键词
锂资源开发
铝基锂吸附剂
吸附动力学
地下盐卤
Lithium resource development
Aluminum-based lithium adsorbent
Adsorption kinetics
Underground brine
作者简介
张奥(1996-),男,天津人,硕士研究生,研究方向为吸附法提锂应用;通讯作者:唐娜,tjtangna@tust.edu.cn。
