An Antisolvent Extraction Strategy for Extrusion Granulation Enhancement of Aluminum-Based Lithium Adsorbent Used in Ultrahigh Mg2+/Li+ Salt Lake Brines,Industrial & Engineering Chemistry Research

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An Antisolvent Extraction Strategy for Extrusion Granulation Enhancement of Aluminum-Based Lithium Adsorbent Used in Ultrahigh Mg2+/Li+ Salt Lake Brines
Industrial & Engineering Chemistry Research ( IF 3.8 ) Pub Date : 2024-02-01 , DOI: 10.1021/acs.iecr.3c04252
Rui Zhang _{1,

2} , Jianguo Yu _{1,

3} , Sen Lin _{1,

3}

Affiliation

Granulation is an essential process for the industrial application of adsorbents packed in adsorption towers, given the high bed pressure drop and powder loss. In this study, a novel extrusion granulation method together with an antisolvent strategy was developed for the aluminum-based lithium adsorbent powder, which has been successfully applied in the lithium extraction industry. Compared with the traditional adsorbent granules, the compressive and flexural strengths of the improved granules were increased from 0.618 to 1.431 MPa and from 0.363 to 1.184 MPa, respectively. Meanwhile, the adsorption rate was significantly sped up without any powder leakage attributed to the flatter and denser film formed on the surface, which firmly encapsulated the powders and formed more pores, improving the mass transfer efficiency in the adsorption process. Moreover, the enhanced aluminum-based lithium adsorbent granules demonstrated a great adsorption performance in the Qarham old brine with a Mg²⁺/Li⁺ mass ratio of 294.24, whose Li⁺ adsorption capacity was stable at 4.45–4.86 mg/g in 24 cycles without structural transformation. Besides, the working adsorption capacity in the fixed bed remained within the range of 3.89–4.44 mg/g; meanwhile, the Mg²⁺/Li⁺ mass ratio in desorption solutions could descend to 0.26 from 294.24.

中文翻译：

超高 Mg2+/Li+ 盐湖卤水铝基锂吸附剂挤压造粒强化反溶剂萃取策略

由于床层压降和粉末损失较高，造粒是吸附塔中吸附剂工业应用的重要过程。在这项研究中，针对铝基锂吸附剂粉末开发了一种新颖的挤出造粒方法和反溶剂策略，该方法已成功应用于锂提取行业。与传统吸附剂颗粒相比，改进颗粒的压缩强度和弯曲强度分别从0.618 MPa和0.363 MPa增加到1.431 MPa和1.184 MPa。同时，由于表面形成了更平坦、更致密的薄膜，牢固地包裹着粉末，形成了更多的孔隙，提高了吸附过程中的传质效率，吸附速度显着加快，没有任何粉末泄漏。此外，增强型铝基锂吸附剂颗粒在Mg ²⁺ /Li ⁺质量比为294.24的查尔姆老卤水中表现出良好的吸附性能，24个循环后Li ⁺吸附容量稳定在4.45~4.86 mg/g。无需结构改造。此外，固定床的工作吸附容量保持在3.89~4.44 mg/g范围内；同时，解吸液中Mg ²⁺ /Li ⁺质量比由294.24下降至0.26。

更新日期：2024-02-01

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