铝基锂吸附剂造粒工艺优化及其原卤提锂性能研究
收稿日期: 2024-03-19
网络出版日期: 2024-05-17
基金资助
国家自然科学基金项目(U20A20148)
Study on granulation optimization for Al-based lithium adsorbent and its lithium recovery performance from brine
Received date: 2024-03-19
Online published: 2024-05-17
铝基锂吸附剂因其对盐湖卤水中的Li+具有高选择性、快速吸/脱附和清水洗脱等优势而被应用于工业化提锂，但仍需进一步优化吸附剂的固定化特性和循环稳定性。基于均相沉淀工艺，利用尿素作为沉淀剂制备了层状双氢氧化物-LiAl2（OH）7·2H2O（LDH）粉末，对其进行注射造粒得到吸附剂颗粒，考察了吸附性能、结构稳定性能和循环使用性能。研究结果表明，醋酸纤维素和NaHCO3可优选作为黏合剂和成孔剂，所得最优粉末状LDH和颗粒状GLDH-1的静态吸附容量分别为7.90 mg/g和7.40 mg/g，表明造粒后多孔负载结构有效改善了黏结剂包埋活性位点的问题，且吸附容量并未显著下降。除此之外，对GLDH-1进行了动态吸附和循环性能测试，对结则茶卡盐湖原卤的动态锂吸附动力学符合准二级吸附行为，并且循环使用15次后，GLDH-1仍能保持首次容量的77%。由此可知，使用醋酸纤维素黏合剂和NaHCO3成孔剂的注射造粒技术可有效提高铝基锂吸附剂颗粒的提锂性能。
王敏锐 , 田桂英 , 张奥 , 葛俊杰 , 张蕾 , 项军 , 唐娜 . 铝基锂吸附剂造粒工艺优化及其原卤提锂性能研究[J]. 无机盐工业, 2025 , 57(3) : 36 -42 . DOI: 10.19964/j.issn.1006-4990.2024-0155
Currently，Al-based lithium adsorbent has been employed for large-scale industrial application，due to its high selectivity in original brine and fast adsorption rate using water elution，but it is also necessary to further improve absorption capacity and cycling performance.In this study，layered double hydroxide LiAl2（OH）7•2H2O（LDH） powders were prepared based on a homogeneous precipitation process using urea precipitant，and injection granulation was performed to obtain adsorbent particles，and the adsorption performance，structural stability performance and recycling performance were investigated.The results showed that cellulose acetate and NaHCO3 could be considered as the proper binder and porogenic agent，respectively.The static adsorption process proved that the adsorption capacities of powdery and granulated LDH were 7.90 mg/g and 7.40 mg/g，respectively.It was shown that the porous loading structure after granulation effectively improved the problem of binder-embedded active sites，and the adsorption capacity was not significantly decreased.In addition，the dynamic adsorption and recycling performance of GLDH-1 was tested，and the dynamic lithium adsorption kinetics to the original brine of Jiezhe Caka Salt Lake conformed to the pseudo-secondary adsorption behavior，and the GLDH-1 could still maintain 77% of the initial capacity after 15 cycles.In short，the injection granulation technique using cellulose acetate binder and NaHCO3 porogenic agent could effectively improve the Li-extraction performance of aluminum-based lithium adsorbent particles.
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