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Leaching of electrodic powders from lithium ion batteries: Optimization of operating conditions and effect of physical pretreatment for waste fraction retrieval

机译:锂离子电池中电极粉末的浸出:优化操作条件并进行物理预处理以回收废物

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Experimental results of leaching tests using waste fractions obtained by mechanical pretreatment of lithium ion batteries (LIB) were reported. Two physical pretreatments were performed at pilot scale in order to recover electrodic powders: the first including crushing, milling, and sieving and the second granulation, and sieving. Recovery yield of electrodic powder was significantly influenced by the type of pretreatment. About 50% of initial LIB wastes was recovered by the first treatment (as electrodic powder with size <0.5 mm, Sample 1), while only 37% of powder with size <1 mm (Sample 2) can be recovered by the second treatment. Chemical digestion put in evidence the heterogeneity of recovered powders denoting different amounts of Co, Mn, and Ni. Leaching tests of both powders were performed in order to determine optimized conditions for metal extraction. Solid/liquid ratios and sulfuric acid concentrations were changed according to factorial designs at constant temperature (80 ℃). Optimized conditions for quantitative extraction (>99%) of Co and Li from Sample 1 are 1/10 g/mL as solid/liquid ratio and +50% stoichiometric excess of acid (1.1 M). Using the same solid/liquid ratio, +100% acid excess (1.2 M) is necessary to extract 96% of Co and 86% of Li from Sample 2. Best conditions for leaching of Sample 2 using glucose are +200% acid excess (1.7 M) and 0.05 M glucose concentration. Optimized conditions found in this work are among the most effective reported in the literature in term of Co extraction and reagent consumption.
机译:报告了使用通过锂离子电池(LIB)机械预处理获得的废物成分进行浸出试验的实验结果。为了回收电子粉末,在中试规模上进行了两次物理预处理:第一步是粉碎,研磨和筛分,第二步是制粒和筛分。电泳粉的回收率受预处理类型的影响很大。第一次处理可回收约50%的初始LIB废物(尺寸<0.5 mm的静电粉末,样品1),而第二次处理仅可回收37%的尺寸<1 mm的粉末(样品2)。化学消化法证明了回收的粉末的异质性,表示不同量的Co,Mn和Ni。为了确定最佳的金属提取条件,对两种粉末进行了浸出测试。在一定温度(80℃)下,根据析因设计改变了固/液比和硫酸浓度。从样品1定量提取(> 99%)Co和Li的最佳条件是固/液比为1/10 g / mL,化学计量过量的酸(1.1 M)为+ 50%。使用相同的固/液比,需要从样品2提取96%的Co和86%的Li(100%过量的酸(1.2 M)。使用葡萄糖浸出样品2的最佳条件是+ 200%的酸过量( 1.7 M)和0.05 M葡萄糖浓度。就Co萃取和试剂消耗而言,这项工作中发现的优化条件是文献中报道的最有效的条件。

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