NaREE(SO4)2 ‧H2O으로부터 희토류산화물 분말 합성에 관한 연구
Synthesis of Rare Earth Oxide from NaREE(SO4)2·H2O by Ion Substitution Reaction
0
조회
0
다운로드
1
인용
0
참고문헌
키워드
초록
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 합성반응에 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.
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.
참고문헌 (12)
- Abreu, R. D., "Purification of rare earth elements from monazite sulphuric acid leach liquor and the production of high-purity ceric oxide", Miner. Eng, 23(6), pp.536~540 (2010)
- 안낙균, "니켈수소 폐이차전지의 습식 재활용을 위한 산침출 및 희토류회수에 대한 연구", 자원리싸이클링, 27(1), pp.22~30 (2018), 한국자원리싸이클링학회[DOI]
- 안낙균, "폐니켈수소전지로부터 희토류 산화물 분말의 회수에 대한 연구", 한국결정성장학회지, 28(2), pp.85~90 (2018), 한국결정성장학회[DOI]
- Ahn, N. K., "Valorization of waste NiMH battery through recovery of critical rare earth metal : A simple recycling process for the circular economy", Waste Manag, 104, pp.254~261 (2020)
- Ahn, N. K., "Recovery of rare earth oxide from waste NiMH batteries by simple wet chemical valorization process", Metals, 9(11), pp.1151~ (2019)
- Bertuol, D. A., "Spent NiMH batteries—The role of selective precipitation in the recovery of valuable metals", J. Power Sources, 193(2), pp.914~923 (2009)
- Dvorak, P., "Obtaining nickel and cobalt from spent NiMH batteries", Inżynieria Mineralna, 2015(2), pp.1~6 (2015)
- Gupta, C. K., "Extractive metallurgy of rare earths", International Materials Reviews, 37(1), pp.197~248 (1992)
- 김대원, "폐니켈수소전지로부터 회수된 희토류 침전물의 희토류산화물 분말 제조에 대한 연구", 한국분말재료학회지, 25(3), pp.213~219 (2018), 한국분말재료학회[DOI]
- Rodrigues, L. E. O. C., "Hydrometallurgical separation of rare earth elements, cobalt and nickel from spent nickel-metal-hydride batteries", J. Power Sources, 195(11), pp.3735~3741 (2010)
- Um, N., "Conversion kinetics of cerium oxide into sodium cerium sulfate in Na2SO4– H2SO4– H2O solutions", Mater. Trans, 53(11), pp.1992~1996 (2012)
- Zhang, P., "Hydrometallurgical process for recovery of metal values from spent nickel-metal hydride secondary batteries", Hydrometallurgy, 50(1), pp.61~75 (1998)