Recovery of indium and yttrium from Flat Panel Display waste using solvent extraction
Journal article, 2016

Oxides of indium and yttrium are two of the key components in Flat Panel Displays (FPDs). In recent years the need to recycle these metal oxides from waste FPDs has been growing. In this work a process to recycle indium and yttrium based on acid leaching and solvent extraction was proposed and studied. Solid waste was leached by acid at S/L ratio = 0.1 g/ml, HCl was found to be more effective than HNO3, possibly due to the formation of soluble metal chloride complexes. The extraction of indium using Cyanex 923 and yttrium using DEHPA from chloride media studied using lab-scale mixer-settlers at a flow rate of 3 ml/min. Leachate of real FPD waste was used as aqueous feed. Good separation between indium, yttrium and other impurities such as iron, copper and aluminum could be achieved by extraction from 1 M HCl with 0.25 M Cyanex 923 diluted in kerosene, followed by stripping with 1 M HNO3 and further purification with 0.2 M DEHPA diluted in kerosene.

FPD

DEHPA

Recycling

Solvent extraction

Indium

Cyanex 923

Rare earth elements

Author

Jiaxu Yang

Industrial Materials Recycling

Teodora Retegan

Chalmers, Chemistry and Chemical Engineering, Energy and Material, Nuclear Chemistry

Britt-Marie Steenari

Chalmers, Chemistry and Chemical Engineering, Energy and Material, Nuclear Chemistry

Christian Ekberg

Chalmers, Chemistry and Chemical Engineering, Energy and Material, Nuclear Chemistry

Separation and Purification Technology

1383-5866 (ISSN)

Vol. 166 117-124

Subject Categories

Analytical Chemistry

DOI

10.1016/j.seppur.2016.04.021

More information

Created

10/7/2017