Department of Chemistry, Faculty of Science, Zagazig University, Zagazig 44519, Egypt.
Department of Civil and Environmental Engineering, Wayne State University, 5050 Anthony Wayne Drive, Detroit, MI 48202, USA.
Int J Mol Sci. 2022 Aug 4;23(15):8677. doi: 10.3390/ijms23158677.
Spent Ni-Cd batteries are now considered an important source for many valuable metals. The recovery of cadmium, cobalt, and nickel from spent Ni-Cd Batteries has been performed in this study. The optimum leaching process was achieved using 20% HSO, solid/liquid (S/L) 1/5 at 80 °C for 6 h. The leaching efficiency of Fe, Cd, and Co was nearly 100%, whereas the leaching efficiency of Ni was 95%. The recovery of the concerned elements was attained using successive different separation techniques. Cd(II) ions were extracted by a solvent, namely, Adogen 464, and precipitated as CdS with 0.5% NaS solution at pH of 1.25 and room temperature. The extraction process corresponded to pseudo-2nd-order. The prepared PTU-MS silica was applied for adsorption of Co(II) ions from aqueous solution, while the desorption process was performed using 0.3 M HSO. Cobalt was precipitated at pH 9.0 as Co(OH) using NHOH. The kinetic and thermodynamic parameters were also investigated. Nickel was directly precipitated at pH 8.25 using a 10% NaOH solution at ambient temperature. FTIR, SEM, and EDX confirm the structure of the products.
废旧镍镉电池现在被认为是许多有价值金属的重要来源。本研究对从废旧镍镉电池中回收镉、钴和镍进行了研究。在 80°C 下，用 20% HSO4，固液比（S/L）为 1/5，反应 6 小时，达到了最佳浸出条件。Fe、Cd 和 Co 的浸出率接近 100%，而 Ni 的浸出率为 95%。采用连续不同的分离技术对所关注的元素进行了回收。Cd(II)离子用溶剂 Adogen 464 萃取，并用 0.5% NaS 溶液在 pH 值为 1.25 和室温下沉淀为 CdS。萃取过程符合拟二级动力学。制备的 PTU-MS 硅胶用于从水溶液中吸附 Co(II)离子，而用 0.3 M HSO4 进行解吸过程。Co(II)离子在 pH 值为 9.0 时用 NHOH 沉淀为 Co(OH)。还研究了动力学和热力学参数。镍在环境温度下用 10% NaOH 溶液在 pH 值为 8.25 时直接沉淀。FTIR、SEM 和 EDX 证实了产物的结构。
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