Force-environment-modulated microfluidic devices possess significant potential for the efficient lithium extraction from salt-lake brines. This paper proposes a novel force-environment-modulated system for the simultaneous Li⁺ concentration and Mg²⁺ removal from high Mg²⁺/Li⁺ ratio (MLR) brines. In this system, multiple parallel barriers are positioned within a microchannel to regulate the flow of fluids. The differentiated horizontal fluid flow velocities implement a localized region of force balance for Li⁺ exclusively, enabling Li⁺ to be collected at the upward outlet while continuously expelling other ions. In addition, a vertical barrier in front of the balance region will increase Li⁺ enrichment and decrease it on the opposing side, thus further enhancing the concentration of Li⁺ and the removal of Mg²⁺ to a greater extent. The results obtained through two-dimensional simulation using a diluted model brine demonstrate that this system has the capability to concentrate Li⁺ by 4.5 times and achieve an 89% removal of Mg²⁺, where the MLR decrease to 3.45, and the separation factor reaches 6.17. The modulation of force environments for differently charged particles provides a new approach to achieve their simultaneous concentration and separation.

力环境调制的微流体装置在从盐湖卤水中高效提取锂方面具有巨大的潜力。本文提出了一种新颖的力-环境调节系统，用于从高 Mg ²⁺ /Li ^{+比（MLR）盐水中同时浓缩 Li +}和去除 Mg ²⁺ 。在该系统中，多个平行屏障位于微通道内以调节流体的流动。差异化的水平流体流速实现了仅针对Li ^{+ 的}局部力平衡区域，使得Li ⁺能够在向上出口处被收集，同时不断排出其他离子。另外，平衡区前面的垂直势垒会增加Li ^{+ 的}富集，而减少相反侧的Li + 富集，从而更大程度地进一步提高Li ^{+的浓度和Mg 2+}的去除。使用稀释模型盐水进行二维模拟得到的结果表明，该系统能够将Li ⁺富集4.5倍，并实现89%的Mg ²⁺去除率，其中MLR降低至3.45，分离因子达到6.17。对不同带电粒子的力环境的调节提供了一种实现它们同时浓缩和分离的新方法。