Hot Laboratory Center, Atomic Energy Authority, P.O. 13759, Inshas, Cairo, Egypt.
J Hazard Mater. 2010 Jan 15;173(1-3):223-30. doi: 10.1016/j.jhazmat.2009.08.072. Epub 2009 Aug 22.
Extraction and separation of Co(II) and Ni(II) from acidic sulfate solutions by solvent extraction technique were studied using different forms of Aliquat 336 diluted with kerosene. The extraction percent of each metal ion was found to increase with increasing pH and extractant concentration. Co(II) was preferentially extracted by different forms of Aliquat 336 over Ni(II) under the same extraction conditions. From analysis of the experimental results, the extraction mechanism of R(4)N-forms was proposed with Co(II). It was found that the highest separation factor (S(Co/Ni)) value of 606.7 was obtained with 0.36 M R(4)N-SCN in kerosene from 2.0M H(2)SO(4) solution at pH 4.8 and shaking time of 20 min. Stripping of the two metal ions from the organic phase was also investigated. Based on the experimental results, a separation method was developed and tested to separate high purity Co(II), Ni(II) and Ln(III) from Ni-MH batteries leached by 2.0M H(2)SO(4). Based on the experimental results, a flow sheet was developed and tested and 0.34 g Co, 1.39 g Ln and 5.2g Ni were obtained from the leaching process.
采用溶剂萃取法，用煤油稀释不同形式的 Aliquat 336 从酸性硫酸盐溶液中萃取和分离 Co(II)和 Ni(II)。研究发现，每种金属离子的萃取率均随 pH 值和萃取剂浓度的增加而增加。在相同的萃取条件下，不同形式的 Aliquat 336 优先萃取 Co(II)而非 Ni(II)。通过对实验结果的分析，提出了 R(4)N 形式与 Co(II)的萃取机理。结果表明，在 pH 值为 4.8，萃取时间为 20 min 的条件下，从 2.0 M H(2)SO(4)溶液中用 0.36 M R(4)N-SCN 在煤油中萃取，可获得最高分离因子(S(Co/Ni))值为 606.7。还研究了从有机相中反萃两种金属离子的情况。基于实验结果，开发并测试了一种分离方法，以从 2.0 M H(2)SO(4)浸出的 Ni-MH 电池中分离高纯 Co(II)、Ni(II)和 Ln(III)。基于实验结果，开发并测试了一个工艺流程，从浸出过程中获得了 0.34 g Co、1.39 g Ln 和 5.2 g Ni。
