Abstract
A nitrate leachate containing Cu(II), Ag(I), Ni(II), Mg(II), and Al(III) was obtained during the leaching of industrial dust, which arises during the pyrometallurgy of spent camera modules. To separate and recover Cu(II) and Ag(I) from the leaching solution, solvent extraction experiments using 5,8-diethyl-7-hydroxydodecan-6-oxime (LIX63) were conducted. LIX63 was found to selectively extract Cu(II) and Ag(I) over other metal ions (Ni(II), Mg(II), and Al(III)) at low nitric acid concentrations. The extraction efficiency of Cu(II) was more affected than that of Ag(I) by the acidity of the feed solution and the LIX63 concentration in the organic phase. Cu(II) and Ag(I) were simultaneously extracted using 2 mol/L LIX63. Cu(II) was separated from the loaded LIX63 via stripping with 4 mol/L HNO3, whereas Ag(I) was recovered via stripping with 0.1 mol/L thiourea after the removal of Cu(II). McCabe–Thiele diagrams for the extraction and stripping of Cu(II) and Ag(I) were constructed. The complete extraction of Cu(II) and Ag(I) was confirmed via counter-current extraction. Moreover, stripping simulation tests confirmed that higher than 99.99% of Cu(II) and 99.2% of Ag(I) were stripped. The purities of Cu(II) and Ag(I) in the recovered solution were 95.2% and 99.993%, respectively. A process flow chart for the recovery of Cu(II) and Ag(I) from the nitrate leachate of the target industrial dust was also provided.
Highlights
Copper (Cu(II)) and silver (Ag(I)) are essential elements that are widely used in daily life
A copper(II) extraction of 95–99% was achieved via three extraction stages with LIX
The industrial dust composed of Cu(II), Ag(I), Ni(II), Mg(II), Al(III), Si (II), and C, which arose during the pyrometallurgy of spent camera modules, was used
Summary
Copper (Cu(II)) and silver (Ag(I)) are essential elements that are widely used in daily life. LIX984 is added to Cyanex 301 to improve the efficiency of stripping. 2. A copper(II) extraction of 95–99% was achieved via three extraction stages with LIX. 2. About 97.3%, 99.7%, and 99.6% of copper(II) can be extracted using LIX 54, cinnamate, and β-diketone, respectively. 2. Stripping efficiency was improved by the addition of LIX 984N to Cyanex 301. 1. Cyanex 302 was a potential extractant for the extraction of copper(II) from aqueous solutions. The selective extraction of Ag(I) over Zn(II) was achieved by using LIX63, when the HNO3 concentration was 0.001–1 mol/L. Several parameters that affect the extraction and stripping efficiencies, such as the acidity of the solution, concentration of the extractant, species and concentration of the strippant, and volume ratio of the aqueous to organic phases, were investigated. The feasibility of the proposed process was verified by performing a batch simulation of counter-current extraction and stripping experiments
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