2015-Sustainable Industrial Processing Summit
SIPS 2015 Volume 11: Recycling & Environmental
| Editors: | Kongoli F, Havlik T, Pagnanelli F |
| Publisher: | Flogen Star OUTREACH |
| Publication Year: | 2015 |
| Pages: | 410 pages |
| ISBN: | 978-1-987820-34-8 |
| ISSN: | 2291-1227 (Metals and Materials Processing in a Clean Environment Series) |
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Recycling Of Rare Earth and Platinum Group Metals from Wastes for Sustainable Resources Processing
Toyohisa Fujita1; Gjergj Dodbiba2; Josiane Ponou2; Atsushi Shibayama3;1THE UNIVERSITY OF TOKYO, Bunkyo, Japan; 2UNIVERSITY OF TOKYO, Bunkyo, Japan; 3AKITA UNIVERSITY, , Japan;
Type of Paper: Plenary
Id Paper: 421
Topic: 7
Abstract:
The aim of the recycling processes developed in our laboratory is to recover rare earth elements and platinum group metals.
Following are some of the projects carried out. The rare earth elements are included in fluorescent lump, LED, magnet, and special lens, abrasives and so on. In the material recycling of fluorescent lump, the powders obtained after the size reduction of waste lump is recovered after removing the mercury. Three kinds of powders, containing rare earths elements, are then separated by the oil and water phase separation. The benefit of rare earth recovery from LED is also discussed.
The disintegration of magnet in rotor is carried out by underwater crushing method. The collected magnet powders are then leached, and the rare earth elements are recovered by crystallization and solvent extraction.
The rare earth elements in lens are dissolved in water by alkali fusion and separated by solvent extraction.
The platinum group metals are used in catalysts, dental polished powders, batteries and slags. The catalysts containing platinum group metals are selectively crushed and collected by physical separation as pretreatment. The precious metals in the dental polished powders are leached and separated by sedimentation.
The small amounts of platinum group metals in the smelting slags are discussed for the concentration by the heat treatments.
Keywords:
Hydrometallurgical; Leaching; Material; Metal; Non-Ferrous; Recycling; Slags; Sustainability; Technology; Wastes;References:
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