Effect of planetary ball milling and solid sodium hydroxide on dissolution of rare earth elements from weathered residual rare earth ores

Tatsuya Kato, Granata Giuseppe, Mariusz Grabda, Chiharu Tokoro, Yuki Tsunazawa, Tetsuichi Takagi

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

The rare earth elements (REEs) are a group of 17 chemically similar metallic elements. The REEs are usually divided into light (LREEs) and heavy rare earth elements (HREEs). Since REEs have essential role in advanced industries, demand for REEs is expected to continue or even increase in future. Since China became predominating global supplier of REEs, the rest of the world is confronted with supply risk and intensively investigates new resources of REEs. As a part of the worldwide research trend, the weathered residual rare earth ore have been proposed for the study. The characteristic of this ore is that the rare earth minerals in this ore are very fine grinded. Because of this, hydrometallurgical processes are studied to recovery REE in this study. The objective of this study is to compare the effect of planetary ball milling without and with solid sodium hydroxide on dissolution of REEs from weathered residual rare earth ore by sulfuric acid. To achieve this, the planetary ball milling without and with solid sodium hydroxide was studied. The structural change of the ore by planetary ball milling without and with solid sodium hydroxide was investigated using x-ray absorption fine structure (XAFS) analysis. Because of REEs concentration in the ore, the targets of XAFS analysis were cerium K and LIII-edges and yttrium K-edge. The leaching experiments after planetary ball milling were conducted using 1 mol/dm3 sulfuric acid for 24 hours. Obtained results indicate that dissolution of LREEs exceeded 90 % due to planetary ball milling without and with solid sodium hydroxide. In case of HREEs, however, comparable dissolution was achieved only in case of planetary ball milling with solid sodium hydroxide. This trend was confirmed by structural changes of the ore investigated by XAFS analysis.

Original languageEnglish
Title of host publicationProceedings of the 10th European Metallurgical Conference, EMC 2019
PublisherGDMB Verlag GmbH
Pages309-325
Number of pages17
ISBN (Electronic)9783940276872
Publication statusPublished - 2019
Event10th European Metallurgical Conference, EMC 2019 - Dusseldorf, Germany
Duration: 2019 Jun 232019 Jun 26

Publication series

NameProceedings of the 10th European Metallurgical Conference, EMC 2019
Volume1

Conference

Conference10th European Metallurgical Conference, EMC 2019
CountryGermany
CityDusseldorf
Period19/6/2319/6/26

Keywords

  • Leaching
  • Planetary ball milling
  • Rare earth elements
  • Weathered residual rare earth ore
  • X-ray absorption fine structure (XAFS) analysis

ASJC Scopus subject areas

  • Metals and Alloys

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    Kato, T., Giuseppe, G., Grabda, M., Tokoro, C., Tsunazawa, Y., & Takagi, T. (2019). Effect of planetary ball milling and solid sodium hydroxide on dissolution of rare earth elements from weathered residual rare earth ores. In Proceedings of the 10th European Metallurgical Conference, EMC 2019 (pp. 309-325). (Proceedings of the 10th European Metallurgical Conference, EMC 2019; Vol. 1). GDMB Verlag GmbH.