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http://dx.doi.org/10.7844/kirr.2021.30.6.61

Effect of Ultrasound Irradiation during Cementation Process for Recovery of Iridium  

Kim, Seunghyun (Department of Integrated Energy and Infra system, Kangwon National University)
Kim, Young-Jin (Department of Research and Development, Korea Institute of Limestone and Advanced Materials)
Seo, Jun-Hyung (Department of Research and Development, Korea Institute of Limestone and Advanced Materials)
Cho, Jin-Sang (Department of Research and Development, Korea Institute of Limestone and Advanced Materials)
Cho, Kye-Hong (Department of Research and Development, Korea Institute of Limestone and Advanced Materials)
Lee, Jaeryeong (Department of Energy & Resources Engineering, Kangwon National University)
Publication Information
Resources Recycling / v.30, no.6, 2021 , pp. 61-67 More about this Journal
Abstract
This work investigated the cementation of iridium from iridium-containing hydrochloric acid leachate. Zinc powder was used as the reducing agent, and the effects of the stoichiometric ratio of Zn/Ir, initial Ir concentration, initial pH, reaction time, and ultrasound irradiation on iridium recovery were investigated. When only the stirrer was used for cementation, the iridium recovery increased with the addition amount of zinc, and the recovery of about 70% at 40 times the stoichiometric ratio of Zn/Ir. In contrast, when employing ultrasonic irradiation with stirring, the recovery of iridium decreased at 20 times or less the stoichiometric amount of zinc. The recovery of iridium increased at 40 times the stoichiometric ratio of Zn/Ir. This result may be due to the ionization of zinc and re-dissolution of iridium during the ultrasound irradiation treatment. When a combination of ultrasonic irradiation and stirring was used for cementation, the iridium recovery increased by more than 27% compared to that when using only the stirrer. It was possible to recover 99% of iridium under the following conditions: reaction time, 60 min; initial pH, 0.01; volume of leachate, 100 mL; 1770 ppm Ir, 40 times the stoichiometric ratio of Zn/Ir.
Keywords
Iridium; cementation; zinc; recovery; ultrasound;
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