| 학회 |
한국화학공학회 |
| 학술대회 |
2013년 봄 (04/24 ~ 04/26, 광주 김대중컨벤션센터) |
| 권호 |
19권 1호, p.267 |
| 발표분야 |
미립자공학 |
| 제목 |
Leaching Kinetics of Neodymium in Sulfuric Acid from E-Scrap of NdFeB Permanent Magnet |
| 초록 |
A leaching of neodymium in NdFeB permanent magnet powder was carried out for the purpose of recovery of neodymium in sulfuric acid (H2SO4) from E-scrap (electric scrap) of NdFeB permanent magnet powder as a reactant. The reaction conditions are as follows; H2SO4 concentration from 2.5 to 3.5 M, pulp density of 110.8 g/L, agitation of 750 rpm and the range of temperature from 30 to 70℃. On the basis of the shrinking core model with the shape of sphere, the leaching mechanism of neodymium was determined by ash layer diffusion rate determining step. Generally, it was known that the solubility of pure rare earth elements in H2SO4 is decreased with the increase of leaching temperatures. However, in this study, the leaching rate of neodymium existing in the E-scrap powders was oppositely increased with the increase of leaching temperatures. This reason was that unreacted ash layer included in the E-scrap powder was acted as a resistance against the leaching. By using the Arrhenius expression, the apparent activation energy values were determined to be 2.26 kJmol-1 at 2.5 M H2SO4 and 2.77 kJmol-1 at 3.0 M H2SO4. |
| 저자 |
유승준1, 윤호성2, 김철주2, 정경우2, 조아람1, 이수정1, 신양호1, 이세일1
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| 소속 |
1서남대, 2지질자원(연) |
| 키워드 |
Leaching; Kinetics
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| E-Mail |
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| 원문파일 |
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