由于锂离子电池 (LIB) 行业的需求增加，从各种锂资源中回收锂化合物引起了人们的关注。本研究旨在利用阴极制造过程中产生的废锂溶液来确保碳酸锂 (Li 2 CO 3 )。研究了初始 Li +浓度、溶液 pH 值和应用的磷酸盐化合物对通过沉淀法将锂离子转化为磷酸锂 (Li 3 PO 4 ) 的影响。然后通过回流和随后的碳酸化方法从 Li 3 PO 4获得Li 2 CO 3，其中从 Li 生产浓缩的 Li 溶液3 PO 4通过与金属氯化物溶液反应。在测试的金属氯化物（AlCl 3、MgCl 2和 CaCl 2）中，CaCl 2表现出最好的生成浓缩锂溶液的性能。从 Li 3 PO 4到 Li 溶液的最高转化效率 (97%)在 80 °C 时观察到，在固 (g)/液 (L) 比为 500 时获得最高的 Li 浓度 (55,900 mg/L)通过回流反应。将得到的Li溶液用氢氧化钠提纯，再用碳酸钠碳酸化，得到高纯度Li 2 CO 3 。所提出的方法显示了一种保护 Li 的替代方法2 CO 3从废Li溶液中提取，其中Li 3 PO 4不需要酸浸来制备用于Li 2 CO 3生产的浓缩Li溶液。

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The recovery of lithium compounds from various Li resources is attracting attention due to the increased demand in the Li-ion battery (LIB) industry. This study aimed to secure lithium carbonate (Li2CO3) using the waste Li solution generated from the cathode manufacturing process. The effects of initial Li+ concentration, solution pH, and applied phosphate compounds were examined on converting Li-ion into lithium phosphate (Li3PO4) by a precipitation method. Li2CO3 was then obtained from Li3PO4 by reflux and subsequent carbonation methods, in which a concentrated Li solution was produced from Li3PO4 by reaction with metal chloride solutions. Among the tested metal chlorides (AlCl3, MgCl2, and CaCl2), CaCl2 showed the best performance to produce a concentrated Li solution. The highest conversion efficiency (97%) from Li3PO4 to Li solution was observed at 80 °C, and the highest Li concentration (55,900 mg/L) was obtained at a solid(g)/liquid(L) ratio of 500 by reflux reaction. High purity Li2CO3 was produced from the obtained Li solution by purification using sodium hydroxide, and its carbonation using sodium carbonate in turn. The proposed method shows an alternative way to secure Li2CO3 from waste Li solution, in which no acid leaching of Li3PO4 is required to prepare concentrated Li solution to be used Li2CO3 production.