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2020 Vol.57, Issue 5

Research Paper

Synthesis of Rare Earth Oxide from NaREE(SO4)2·H2O by Ion Substitution Reaction

NaREE(SO4)2‧H2O으로부터 희토류산화물 분말 합성에 관한 연구

Dae-Weon Kim1
Bo-Ram Kim2
Hee-Lack Choi3*
김 대원1
김 보람2
최 희락3*
1Chief Researcher, Advanced Materials and Processing Center, Institute for Advanced Engineering (IAE)
2Researcher, Advanced Materials and Processing Center, Institute for Advanced Engineering (IAE)
3Professor, Department of Materials Science and Engineering, Pukyong National University
1고등기술연구원 신소재공정센터 수석연구원
2고등기술연구원 신소재공정센터 연구원
3부경대학교 재료공학과 교수
* Corresponding Author
October 2020. pp. 405-412
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Abstract

The recovery of rare earth elements (REE) including La, Nd, and Ce in spent NiMH batteries is an important issue in a resource recovery aspect. In this paper, we synthesized the NaREE(SO4)2 ․ H2O(REE: La, Ce, Nd) powders for the study of the mechanism of recovery of rare earth and conversion to rare earth oxides for the main rare earth components contained in waste NiMH batteries. The REE2(CO3)3 ․ xH2O powders was obtained through ion exchange reaction using sodium carbonate. Then, heat treatment was performed based on the thermogravimetric analysis (TGA) result, and It was found that the change of the crystal structure by the heat treatment. As a result of FESEM, the powders synthesized in this study showed prismatically (NaREE(SO4)2 ․ H2O) and plate-like (REE2(CO3)3 ․ xH2O) shape. Finally, the XRD analysis showed that the conversion of oxide crystal phases of NaREE(SO4)2 ․ H2O to La2O3, Nd2O3, and CeO2 was achieved through ion substitution reaction and heat treatment.

Keywords
NiMH battery
Rare earth precipitate
Rare earth carbonate
Rare earth oxide
Metathesis reaction

폐니켈수소전지에는 다양한 희토류 원소가 함유되어 있어 자원 회수 관점에서 희토류의 회수는 중요한 이슈이다. 본 논문에서는 폐니켈수소전지로부터 희토류를 회수하기 위해 NaREE(SO4)2 ․ H2O(REE: La, Nd, Ce)형태로 전환하는 연구를 진행하였다. 합성된 분말은 탄산나트륨과의 이온치환반응을 통해 수화물 형태의 희토류 탄산화물을 얻을 수 있었으며, 이후 희토류 산화물 합성 반응에 앞서, TG 분석 결과를 기반으로 열처리에 따른 결정구조의 변화를 확인하였다. 이온치환반응과 열처리를 통해 La2O3, Nd2O3, 그리고 CeO2의 산화물 결정상의 전환이 이루어진 것을 알 수 있었다.

키워드
니켈수소전지
희토류 침전물
희토류 탄산염
희토류 산화물
이온치환반응
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Information
  • Publisher :The Korean Society of Mineral and Energy Resources Engineers
  • Publisher(Ko) :한국자원공학회
  • Journal Title :Journal of the Korean Society of Mineral and Energy Resources Engineers
  • Journal Title(Ko) :한국자원공학회지
  • Volume : 57
  • No :5
  • Pages :405-412
  • Received Date :2020. 07. 22
  • Revised Date :2020. 08. 12
  • Accepted Date : 2020. 08. 25
  • DOI :https://doi.org/10.32390/ksmer.2020.57.5.405
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