Solvent extraction studies of copper(II) from sulfate media have been carried out using a selected non-commercial extractant N,N-dihexyl-N′-hydroxypyridine-2-carboximidamide (DH2PIA) diluted with toluene and heptane. The presented results indicated that the extraction of copper(II) was very sensitive to the pH_eq, extractant concentration and the type of diluent. Also the pH_0.5 values depended on the type of diluent and varied from 2 for heptane to 2.8 for toluene. The isotherms of the extraction and the McCabe-Thiele diagram revealed that using the single stage extraction at O/A = 2 Cu(II) can be removed almost completely from the leach solution. Stripping of the loaded copper(II) to the sulfuric acid solution (10%, A/O = 10) yielded rich electrolyte with 37.7 g/L Cu(II), while the stripping test with the spent electrolyte allowed for enrichment of the solution to 67.6 g/L Cu(II). Moreover, the extraction of Cu(II) with DH2PIA from a leach solution containing also Fe(II) is selective and allows to enrich the organic phase in Cu(II).

已经使用选择的非商业萃取剂N，N-二己基-N'-羟基吡啶-2-羧酰亚胺（DH2PIA）从硫酸盐介质中溶剂萃取铜（II）的研究，该甲苯和庚烷被稀释。结果表明，铜（II）的萃取对pH _eq，萃取剂浓度和稀释剂类型非常敏感。还有pH _0.5值取决于稀释剂的类型，从庚烷的2到甲苯的2.8不等。提取的等温线和McCabe-Thiele图显示，使用O / A = 2 Cu（II）的单级提取可以从浸出溶液中几乎完全去除。将负载的铜（II）汽提到硫酸溶液（10％，A / O = 10）中可得到37.7 g / L的富铜（II）电解质，而用废电解质进行的汽提试验可以使溶液富集至67.6 g / L Cu（II）。此外，用DH2PIA从还含有Fe（II）的浸出溶液中萃取Cu（II）是选择性的，可富集Cu（II）中的有机相。