Abstract：
The aim of this project is to develop and evaluate the economic performance of a complete process for recovering nickel, cobalt, and rare earths (REEs) from nickel metal hydride (Ni-MH) battery waste. The main elements contained in the battery powder are Ni (523 g/kg), La (58 g/kg), Co (39 g/kg), Zn (21 g/kg), Nd (19 g/kg), Sm (19 g/kg) and Ce (14 g/kg). Metal leaching was carried out with 2 M sulfuric acid, solubilising 100% of Ni, 93% of Co and 94% of REEs. Rare earths were precipitated with NaOH, then purified after resolubilization in nitric acid. Solvent extraction with bis(2-ethylhexyl) phosphoric acid (D2EHPA) followed by bis(2,4,4-trimethylpentyl) phosphinic acid (Cyanex 272) was used to separate Ni and Co. At the end of the process, REEs, nickel, and cobalt were recovered as oxides after precipitation as oxalates. The REE, nickel and cobalt oxides obtained have purities of 97.6%, 97.2% and 93.2% respectively. A techno-economic study was carried out using SuperPro Designer software. In this scenario, plant capacity was set at 1.0 t of used battery powder per hour for an operating period of 8 h/d and 250 days per year. The total investment was estimated at $26.9 million, with a payback period of 1.58 years. For a 15-year life, the net present value of this project is estimated at $95.9 million, with an interest rate of 7%. The internal rate of return is estimated at 46.1%, which is considered acceptable and economically viable.
摘要：
该项目的目的是开发和评估回收镍的完整工艺的经济性能，钴,和来自镍金属氢化物（Ni-MH）电池废物的稀土（REE）。电池粉末中含有的主要元素是Ni（523g/kg），La（58g/kg），Co（39g/kg），锌（21克/千克），Nd（19g/kg），Sm(19μg/kg)和Ce(14μg/kg)。用2M硫酸进行金属浸出，溶解100%的Ni，93%的Co和94%的REE。用NaOH沉淀稀土,然后在硝酸中再溶解后纯化。用双(2-乙基己基)磷酸(D2EHPA)溶剂萃取,然后用双(2,4,4-三甲基戊基)次膦酸(Cyanex272)分离Ni和Co。REEs,镍,和钴在作为草酸盐沉淀后作为氧化物回收。REE,获得的镍和钴氧化物纯度为97.6%，分别为97.2%和93.2%。使用SuperProDesigner软件进行了技术经济研究。在这种情况下，工厂容量设定为每小时1.0吨废旧电池粉末，运行周期为8小时/天，每年250天。总投资估计为2690万元,投资回收期为1.58年。15年的生活，该项目的净现值估计为9590万美元，利率为7%。内部收益率估计为46.1%,这被认为是可以接受的和经济上可行的。
