Investigation of an electrochemical method for separation of copper, indium, and gallium from pretreated cigs solar cell waste materials
Artikel i vetenskaplig tidskrift, 2015

Recycling of the semiconductor material copper indium gallium diselenide (CIGS) is important to ensure a future supply of indium and gallium, which are relatively rare and therefore expensive elements. As a continuation of our previous work, where we recycled high purity selenium from CIGS waste materials, we now show that copper and indium can be recycled by electrodeposition from hydrochloric acid solutions of dissolved selenium-depleted material. Suitable potentials for the reduction of copper and indium were determined to be -0.5 V and -0.9 V (versus the Ag/AgCl reference electrode), respectively, using cyclic voltammetry. Electrodeposition of first copper and then indium from a solution containing the dissolved residue from the selenium separation and ammonium chloride in 1 M HCl gave a copper yield of 100.1 ± 0.5% and an indium yield of 98.1 ± 2.5%. The separated copper and indium fractions contained no significant contamination of the other elements. Gallium remained in solution together with a small amount of indium after the separation of copper and indium and has to be recovered by an alternative method since electrowinning from the chloride-rich acid solution was not effective.

diselenide

hydrochloric acid

unclassified drug

cyclic potentiometry

gallium

silver

selenide

Article

waste

chloride

copper

selenium

ammonium chloride

electrode

indium

materials

electrochemistry

silver chloride

Författare

Anna Gustafsson

Chalmers, Kemi- och bioteknik, Industriell materialåtervinning

F. Bjorefors

Uppsala universitet

Britt-Marie Steenari

Chalmers, Kemi- och bioteknik, Industriell materialåtervinning

Christian Ekberg

Chalmers, Kemi- och bioteknik, Industriell materialåtervinning

The Scientific World Journal

1537-744X (ISSN)

Vol. 2015 494015

Drivkrafter

Hållbar utveckling

Ämneskategorier

Kemi

Styrkeområden

Materialvetenskap

DOI

10.1155/2015/494015