2014-Sustainable Industrial Processing Summit
SIPS 2014 Volume 6: Rare Earths & Ionic Liquids
| Editors: | Kongoli F |
| Publisher: | Flogen Star OUTREACH |
| Publication Year: | 2014 |
| Pages: | 432 pages |
| ISBN: | 978-1-987820-08-9 |
| ISSN: | 2291-1227 (Metals and Materials Processing in a Clean Environment Series) |
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Chemical and Electrochemical controls of rare-earth and noble metal compounds and processing of high performance materials by using molten salts as reaction media
Tsutomu Yamamura1;1TOHOKU UNIVERSITY, Sendai, Japan;
Type of Paper: Regular
Id Paper: 169
Topic: 11
Abstract:
To realize the global sustainable society, provisions of scarce functional material resources and energy resources are keen issues. Recently, with these bottom lines, there has been a wide interest in the development of processes for recycling minor metals, such as rare-earths and platinum group metals, because the formers are indispensable for producing high performance magnets, and the latters are used for the production of high density recording media and processing of gas waste from automobiles. Furthermore, the dry processes using molten as reaction media for spent nuclear fuels are recently drawing attention.
In this study, alkali metal chlorides, LiCl-NaCl-KCl system for rare earths and NaCl-CsCl system for platinum group metals are chosen as reaction media. In order to develop chemical and electrochemical controls of rare-earth and platinum metal compounds, thermo dynamic stabilities in terms of electric potential and basicity for chemical species of rare earths; La, Ce, Nd, Sm and Dy, and Rh were investigated .The equilibrium potentials as a function of oxide ion concentration were measured. Electrochrmical transient methods such as Cyclic voltammetry, square wave amperometry were also used under the control of the concentration of oxide ions. The mechanism of the reduction processes of the metals were clarified. Then, rare earth containing thin films were prepared. Platinum-Palladium-Rhodium ternary nano and micro sized metal powders were also prepared by the collaboration of dry and wet processes. The powders are expected to be used for oxygen sensors and catalyses of waste gases from automobiles.