MATERIALS TRANSACTIONS
Online ISSN : 1347-5320
Print ISSN : 1345-9678
Pyrometallurgical Recovery of Indium from Dental Metal Recycling Sludge by Chlorination Treatment with Ammonium Chloride
Osamu TerakadoTakashi SaekiRyoji IrizatoMasahiro Hirasawa
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2010 Volume 51 Issue 6 Pages 1136-1140

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Abstract

In the present paper we address the novel chlorination process for recovery of indium selectively from dental metal recycling sludge which contains considerably high amount of indium. The process is based on the utilization of ammonium chloride, NH4Cl, as chlorination reagent. It was found that indium could be successfully recovered from the sludge in the form of volatile indium chloride by heating the mixture of sludge and NH4Cl at the temperature of 400°C under inert atmosphere. The influence of process parameters, such as composition of NH4Cl, was investigated in order to achieve high process efficiency.

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© 2010 The Japan Institute of Metals and Materials
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