Metal Extraction and Recycling Division, CSIR-National Metallurgical Laboratory, Jamshedpur 831007, India; Department of Chemistry, Indian Institute of Technology (ISM), Dhanbad 826004, India.
Metal Extraction and Recycling Division, CSIR-National Metallurgical Laboratory, Jamshedpur 831007, India.
Waste Manag. 2021 Feb 15;121:452-457. doi: 10.1016/j.wasman.2020.10.002. Epub 2020 Dec 23.
Novel route has been developed to selectively extract lithium (Li), cobalt (Co) and manganese (Mn) from the leach liquor of discarded lithium ion batteries (LIBs) containing 1.4 g/L Cu, 1.1 g/L Ni, 11.9 g/L Co, 6.9 g/L Mn and 1.2 g/L Li. Initially, Cu and Ni were extracted by solvent extraction techniques using 10% LIX 84-IC at equilibrium (Eq.) pH 3 and 4.6, respectively. Subsequently, precipitation studies were carried out at different conditions such as pH, reaction time, precipitant concentration etc., to optimize the parameters for selective precipitation of Co from the leach liquor. Result showed that 99.2% Co was precipitated from the leach liquor (11.9 g/L Co, 6.9 g/L Mn and 1.2 g/L Li) after extraction of Cu and Ni in a range of pH 2.9 to 3.1 using un-diluted ammonium sulfide solution (10% v/v) as a precipitant at 30 °C, while only 0.89% Mn and 0.62% Li were co-precipitated. After Co precipitation, 98.9% Mn was extracted from the filtrate using 10% D2EHPA at equilibrium pH 4.5, and Li remained in raffinate. From the obtained purified solution, metals could be recovered either in a form of salt/metals by precipitation/ evaporation/ electrolysis method.
已开发出一种新方法，可从含有 1.4 g/L Cu、1.1 g/L Ni、11.9 g/L Co、6.9 g/L Mn 和 1.2 g/L Li 的废弃锂离子电池 (LIB) 的浸出液中选择性地提取锂 (Li)、钴 (Co) 和锰 (Mn)。最初，使用 10% LIX 84-IC 在平衡 (Eq.) pH 3 和 4.6 处通过溶剂萃取技术萃取 Cu 和 Ni。随后，进行了沉淀研究，在不同条件下（如 pH、反应时间、沉淀剂浓度等），以优化从浸出液中选择性沉淀 Co 的参数。结果表明，在提取 Cu 和 Ni 后，使用未稀释的硫化铵溶液（10% v/v）作为沉淀剂，在 30°C 下，在 pH 2.9 至 3.1 的范围内，从浸出液（11.9 g/L Co、6.9 g/L Mn 和 1.2 g/L Li）中沉淀出 99.2%的 Co，而仅沉淀出 0.89%的 Mn 和 0.62%的 Li。Co 沉淀后，使用 10% D2EHPA 在平衡 pH 4.5 下从滤液中提取 98.9%的 Mn，而 Li 留在萃余液中。从获得的净化溶液中，可以通过沉淀/蒸发/电解方法以盐/金属的形式回收金属。
