Abstract
The recycling of metals from electronic equipment waste (e-waste) is of great concern today. The work described in the article focuses on the application of ionic liquids (ILs) to selectively recover of precious metals (Ag and Au) from the anodic slime obtained at the anodic dissolution of cast e-waste. The ingots obtained from molten and cast anodic slime were selectively dissolved in ILs. Silver and gold compositions of the ingots: 39.7 wt.% and respectively 18.9 wt.%. The IL used was an eutectic mixture of choline chloride with ethylene glycol in a 1:2 molar ratio. As catalytic/oxidizing agent, there was used pure iodine in a concentration of 0.1-0.2 moldm-3 at 298-303 K. Cyclic voltammetry was employed for the determination of the electrochemical windows of ILs as well as of the dissolution and electrodeposition potentials of principal metals present in the ingot (anode). For Ag and Au, the deposition potentials determined were 0.074 V and respectively 0.696 V. The XRD and SEM-EDX analyses revealed that the content of precious metals in the cathodic deposits was 99 wt.% for Ag and respectively ]70 wt.% for Au. We demonstrated that ILs electrolytes could be a solution to selective recovery of precious metals from e-waste.
Highlights
Results and discussionsThe three anodic dissolution processes (1, 2 and 3) for obtaining the S1 sample from e-waste were carried out in an electrolyte containing 150 g L-1 H2SO4, 120 g L-1 CuSO4 5H2O and 1 g L-1 bone glue, which was used as brightening agent for the improvement of the cathodic deposit
The recycling of metals from electronic equipment waste (e-waste) is of great concern today
This Deep eutectic solvents (DES) formed by ChCl-ethylene glycol (EG), named Ethaline, has a unique combination of properties that include the high solubility of a big range of neutral and charged metallic species
Summary
The three anodic dissolution processes (1, 2 and 3) for obtaining the S1 sample from e-waste were carried out in an electrolyte containing 150 g L-1 H2SO4, 120 g L-1 CuSO4 5H2O and 1 g L-1 bone glue, which was used as brightening agent for the improvement of the cathodic deposit. After the first anodic dissolution process, the cathodic deposit contains Cu and Cu-Sn alloy. The anodic slime obtained from the first dissolution was collected from the bottom off the cell, washed abundantly with distilled water and dried in an oven at 353 K. The obtained ingot was subjected to a new anodic dissolution (anodic dissolution 2). After this second dissolution on cathode was obtained metallic Cu of >99.5% purity.
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