Abstract A single oxidative leaching process was developed for simultaneous enhancement of dissolution of nickel and precipitation of lanthanum by using Na2S2O8 in sulfuric acid solution from a heat-treated mixture of batteries containing 50 wt.% alkaline batteries, 25 wt.% Ni-MH batteries, and 25 wt.% Ni-Cd batteries. The effect of leaching parameters was investigated, including the concentrations of sulfuric acid, Na2S2O8, and H2O2, the temperature, and the leaching time. The results show that almost all metals such as zinc, manganese, and cadmium are dissolved by 2 M sulfuric acid, but the leaching efficiency of nickel is 86.8%. However, in a leaching process using Na2S2O8, the leaching efficiency of Ni is enhanced while lanthanum is selectively precipitated in the form of NaLa(SO4)2·H2O at the same time, and this result is supported by XRD, ICP, and SEM analysis. Under the optimum conditions of 2 M H2SO4, 10 vol.% H2O2, 10 vol.% 1 M Na2S2O8, and 95 ℃, 97.8% of the nickel is leached while 98.8% of the lanthanum is selectively precipitated. This study shows that the separation and purification stages can be simplified to recover La and valuable metals.

中文翻译：

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混合电池一锅法氧化浸出La沉淀和Ni溶解增强

摘要 开发了一种单一的氧化浸出工艺，通过在硫酸溶液中使用 Na2S2O8，从含有 50 wt.% 碱性电池和 25 wt.% Ni-MH 电池的电池混合物中同时增强镍的溶解和镧的沉淀。 , 和 25 wt.% Ni-Cd 电池。研究了浸出参数的影响，包括硫酸、Na2S2O8 和 H2O2 的浓度、温度和浸出时间。结果表明，锌、锰、镉等几乎所有金属都被2M硫酸溶解，但镍的浸出率为86.8%。然而，在使用 Na2S2O8 的浸出过程中，Ni 的浸出效率提高，同时镧以 NaLa(SO4)2·H2O 的形式选择性沉淀，这一结​​果得到了 XRD 的支持，ICP 和 SEM 分析。在2 M H2SO4、10 vol.% H2O2、10 vol.% 1 M Na2S2O8、95℃的最佳条件下，97.8%的镍被浸出，98.8%的镧被选择性沉淀。该研究表明，可以简化分离和纯化阶段以回收 La 和有价金属。