A novel granulation method with high hydrophilia and considerable mechanical strength was developed for the lithium aluminum double hydroxides (Li/Al-LDHs) to recover lithium from old brines with ultrahigh Mg²⁺/Li⁺ ratios. The granulated Li/Al-LDHs (GLDH) displayed a great structure stability and Li⁺ adsorption capacity could reach up to 4.92 mg/g without weakening on the encapsulated Li/Al-LDHs at 303 K. The pore volume diffusion model (PVDM) based on adsorption isotherms was conducted to confirm that the Li⁺ adsorption process was controlled by the pore volume diffusion in GLDH. Besides, GLDH showed a great selectivity to Li⁺ with an ion selective sequence of Li⁺ > Na⁺ > K⁺≫Mg²⁺ > Ca²⁺, especially ${\alpha }_{\mathit{Mg}}^{\mathit{Li}}$ could reach to 156.1. The column experiments declared that the adsorbed Li⁺ could be easily eluted by neutral Li⁺-containing solution and the Mg²⁺/Li⁺ ratio could decrease significantly from 301.58 in old brine to 0.99 in the strip solution. The working Li⁺ adsorption capacity of packed GLDH column exceeded 2.6 mg/g when Qarhan old brine was fed at a flow rate of 15 mL/min. Moreover, it was found that the strip solution with Li⁺ concentration less than 150 mg/L would cause the structure collapse of Li/Al-LDHs.

针对锂铝双氢氧化物（Li / Al-LDHs），开发了一种具有高亲水性和相当高的机械强度的新型造粒方法，以从具有超高Mg ²⁺ / Li ⁺比的老盐水中回收锂。颗粒化的Li / Al-LDHs（GLDH）具有很好的结构稳定性，在303 K时，Li ^+的吸附能力可达4.92 mg / g，而对封装的Li / Al-LDHs没有减弱。孔体积扩散模型（PVDM）基于吸附等温线进行了研究，以确认Li ⁺吸附过程受GLDH中孔体积扩散的控制。此外，GLDH对Li ⁺具有很高的选择性，其离子选择序列为Li ⁺  > Na⁺  > K ⁺ ≫Mg ²⁺  > Ca ²⁺，尤其是${\alpha }_{\mathit{镁}}^{\mathit{里}}$可能达到156.1。柱实验表明，吸附的Li ⁺可以很容易地被中性的Li ⁺溶液洗脱，并且Mg ²⁺ / Li ^+的比例可以从旧盐水中的301.58显着降低到汽提溶液中的0.99。当以15 mL / min的流速注入Qarhan旧盐水时，填充的GLDH色谱柱的工作Li ⁺吸附容量超过2.6 mg / g。此外，已发现Li ⁺浓度小于150 mg / L的试纸溶液将引起Li / Al-LDHs的结构破坏。