Due to lithium’s high energy along with other exceptional characteristics, lithium demand across many industries is rising, specifically for Li-batteries. Therefore, a sufficient supply of high purity lithium is vital in order for these significant technologies to develop. In the current work, industrial grade lithium chloride has been successfully treated with four simple precipitation steps to obtain a high purity battery grade lithium carbonate of >99.95%. The LiCl starting solutions contained K, Na, Mg, Ca, Cu, Ni, and Fe chloride contaminants and solutions of 2.5 to 10 M were simulated. The heavier metals and the majority of Mg were removed in a single step with an increase in pH. The removal of Ca and remaining Mg was executed by sodium oxalate addition where the calcium levels of the 10 M were able to be reduced to 5–6 ppm in solution. It appeared that the higher molarity and ionic strength of the LiCl solution aided in obtained higher degrees of impurity removal. Finally, high purity Li₂CO₃ was obtained by first precipitating from brine solution, followed by a second purification step with pressurized CO₂. The second step allowed for the removal of entrapped Na and K after the first precipitation, resulting in >99.95 wt% purity Li₂CO₃.

由于锂的高能量以及其他出色的特性，许多行业，特别是锂电池的锂需求正在上升。因此，为了开发这些重要技术，充足的高纯度锂供应至关重要。在目前的工作中，工业级氯化锂已成功通过四个简单的沉淀步骤进行了处理，从而获得了大于99.95％的高纯度电池级碳酸锂。LiCl起始溶液包含K，Na，Mg，Ca，Cu，Ni和Fe氯化物污染物，并模拟了2.5至10 M的溶液。随着pH值的增加，较重的金属和大部分的Mg可在一个步骤中除去。通过添加草酸钠可以除去Ca和残留的Mg，使溶液中的10 M钙含量降低至5-6 ppm。看来，LiCl溶液的较高摩尔浓度和离子强度有助于获得较高程度的杂质去除。最后，高纯李首先从盐水溶液中沉淀，然后进行第二步纯化，即使用加压的CO _2来获得₂ CO ₃。第二步允许在第一次沉淀后除去夹带的Na和K，得到纯度> 99.95 wt％的Li ₂ CO ₃。