A1 Journal article (refereed), original research

Novel mechanical pre-treatment methods for effective indium recovery from end-of-life liquid-crystal display panels


Open Access publication


Publication Details

Authors: Lahtela Ville, Virolainen Sami, Uwaoma Andreas, Kallioinen Mari, Kärki Timo, Sainio Tuomo

Publisher: Elsevier

Publication year: 2019

Language: English

Journal acronym: JCPL

Volume number: 230

Start page: 580

End page: 591

Number of pages: 12

ISSN: 0959-6526

eISSN: 1879-1786

JUFO level of this publication: 2

Digital Object Identifier (DOI): http://dx.doi.org/10.1016/j.jclepro.2019.05.163

Open Access: Open Access publication

Location of the parallel saved publication: http://urn.fi/URN:NBN:fi-fe2019060318250


Abstract

This study investigated the suitability of mechanical pre-treatment
methods (mechanical abrasion and treatments of heat, laser, and plasma)
together with a hydrometallurgical process comprising leaching and
cementation for recovering indium from used LCD screens. With mechanical
abrasion pre-treatment, 96.2% of indium was recovered and black mass
with an indium content of 15.6 wt percent was obtained. Following the
mechanical recovery, sulfuric acid leaching was used to produce
leachates with an indium purity ranging from 86.3 to 98.0% with an
88.7–100% yield for indium. Indium was recovered from the leachate by
cementation with zinc powder, but also the impurity metals were
cemented. The suggested mechanical pre-treatment involving the indium
recovery process was seen as a viable option since it dramatically
reduces the mass fed to the hydrometallurgical purification process (by
roughly a factor of 1000), and up to 97.1% pure indium product can be
obtained with a simplified process. The purity of the indium product can
be further increased by additional purification steps.


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Last updated on 2020-20-03 at 10:03