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Experimental Study on Recovering Rare Earths from Separation Slag of Ni–Metal Hydride Battery Wastes by Hydrochloric Acid Leaching
Transactions of the Indian Institute of Metals ( IF 1.6 ) Pub Date : 2020-08-14 , DOI: 10.1007/s12666-020-02057-w
Yong-chun Deng , Wen-bin Xin , Yin-ju Jiang , Peng-yu Wang , Ye Yuan

The RE-bearing slag used in the experiment was obtained from Ni–metal hydride battery wastes by H2 selective reduction and melting separation method, and the slag composition mainly consisted of 46.44 wt% REO, 26.05 wt% SiO2, 17.68 wt% Al2O3 and 6.32 wt% MnO. The influence of different reacting factors on the leaching rate of rare earth was investigated, and subsequently, the leaching dynamics was analyzed at low temperature and ordinary pressure and at high pressure and high temperature separately. The results showed that the optimal leaching parameters for the low-temperature and ordinary pressure conditions were 2.69 mol L−1 hydrochloric acid, 10:1 liquid to solid ratio at 85 °C for 75 min and the rare-earth leaching rate reaching 94.94%. According to Arrhenius formula, the apparent activation energy was 57.68 kJ mol−1 and the preexponential factor was 5.02 × 104 s−1, and the related reaction orders of the hydrochloric acid concentration and particle size were 3.63 and − 1.59, respectively. For the high-pressure and high-temperature leaching process, the optimal conditions were 2.49 mol L−1 hydrochloric acid, 10:1 liquid to solid ratio at 130 °C for 25 min and the rare-earth leaching rate 96.70%. The apparent activation energy analyzed was 53.63 kJ mol−1, and the preexponential factor was 5.32 × 103 s−1. The two leaching processes were both controlled by the interfacial mass transfer and solid film diffusion.



中文翻译:

盐酸浸出从镍氢电池废渣分离渣中回收稀土的实验研究

实验中使用的含RE渣是通过H 2选择性还原和熔融分离法从镍氢电池废料中获得的,渣成分主要由46.44 wt%REO,26.05 wt%SiO 2和17.68 wt%Al组成。2 O 3和6.32 wt%MnO。研究了不同反应因素对稀土浸出率的影响,随后分别对低温,常压,高压和高温下的浸出动力学进行了分析。结果表明,低温和常压条件下的最佳浸出参数为2.69 mol L -1盐酸,在85°C下液固比为10:1,持续75分钟,稀土浸出率达到94.94%。根据Arrhenius公式,表观活化能为57.68kJ mol -1,前指数因子为5.02×10 4  s -1,盐酸浓度和粒径的相关反应级分别为3.63和-1.59。对于高压高温浸出过程,最佳条件为:2.49 mol L -1盐酸,130°C下液固比为10:25 25min,稀土浸出率为96.70%。分析的表观活化能为53.63 kJ mol -1,前指数因子为5.32×10 3  s-1。两种浸出过程均受界面传质和固体膜扩散的控制。

更新日期:2020-08-14
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