Recycle rare earth oxides (REO) from Nd-Fe-B magnets slurry

Bo Kai Chang, Wei-sheng Chen, Kuan Yu Shih

Research output: Contribution to conferencePaper

Abstract

During the process of slicing and polishing on the permanent magnets, additional cooling agent would mix with the slurry and become rare earth containing slurry. There is around 100 tons of Nd-Fe-B magnets slurry annually in Taiwan. The analysis of the sample shows that spent Nd-Fe-B magnets slurry contains Nd, 24.31%, Fe, 73.22%, B, 1.46%, and thus, it is valuable to recover it. The purpose of this recycling process is to build an optimal hydrometallurgy process to recycle Nd-Fe-B magnets slurry and makes it into rare earth oxides as a final product. The process includes leaching (hydrochloric acid), precipitation, solvent extraction (P507), and calcination. The final product is rare earth oxide powder, purity is over 98%, and recovery rate is over 90%.

Original languageEnglish
Pages705-711
Number of pages7
Publication statusPublished - 2015 Jan 1
Event13th International Symposium on East Asian Resources Recycling Technology, EARTH 2015 - Pattaya, Thailand
Duration: 2015 Nov 12015 Nov 4

Other

Other13th International Symposium on East Asian Resources Recycling Technology, EARTH 2015
CountryThailand
CityPattaya
Period15-11-0115-11-04

All Science Journal Classification (ASJC) codes

  • Environmental Science(all)

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    Chang, B. K., Chen, W., & Shih, K. Y. (2015). Recycle rare earth oxides (REO) from Nd-Fe-B magnets slurry. 705-711. Paper presented at 13th International Symposium on East Asian Resources Recycling Technology, EARTH 2015, Pattaya, Thailand.