Extraction and Separation of Cadmium from the Chloride Solution of E-Waste Using Cyanex 923 Impregnated Amberlite XAD-7HP Resin

Abstract

Cadmium(II) is not only hazardous but is also an impurity in the leachate of electronic waste which is processed during the extraction of valuable metals. This research focuses on the removal of cadmium from the leachate of e-waste containing Cu, Ni, Sn, Pb, Cd, Zn and Au using a solvent impregnated resin (SIR). The studies performed for the extraction of cadmium from the high acidity chloride solution showed the effective removal of cadmium forming solvation compound with Cyanex 923 impregnated Amberlite XAD-7HP resin. In the adsorption studies, the kinetics was found to be a second-order rate and followed a Langmuir isotherm. The results also showed that SIR comprising Cyanex 923 is effective for adsorption of zinc and gold from the leachate. The loaded metals on the SIR were separated by using selective eluents, water for Cd and Zn, whereas thiourea eluted Au. The remaining metals in the raffinate could be further processed to recover valuables after removing cadmium and other metals by a suitable hydrometallurgical processes.

Removal of procainamide and lidocaine on Amberlite XAD7HP resin and of As(V), Pb(II) and Cd(II) on the impregnated resin for water treatment

“…Thus, the resin in LID form can be used as a specific material for wastewater containing Pb(II) remediation and selective for Cd(II) while As(V) was weakly retained, this behavior being highlighted in the case of the study of the most concentrated S5 solution. Comparable studies on the use of impregnated XAD7HP resin in the adsorption of: Au(III) [37], Cd(II) and Zn(II) [53] respectively Sc(III) [54] have been done showing good results in metal retention. Van Nguyen et al, 2013 impregnated XAD7HP resin with Cyanex 923 [55] and the impregnated resin was tested for removal of Cr(VI) from acidic medium.…”