| 학회 | 한국재료학회 |
| 학술대회 | 2020년 가을 (11/18 ~ 11/20, 휘닉스 제주 섭지코지) |
| 권호 | 26권 1호 |
| 발표분야 | E. 환경/센서 재료 분과 |
| 제목 | Recovery of valuable metals from permanent magnet a hydrometallurgical method |
| 초록 | Neodymium (Nd) and dysprosium (Dy) are important ingredients of mobile phone camera modules because of their unique physicochemical properties. Spent mobile phone camera modules are important secondary sources of Nd and Dy. The recovery of rare earth elements, such as Nd and Dy, from secondary sources has been gaining significant interest because of their growing demand, in contrast to limited natural oral production and low recycling rates. In Korea, as the smartphone market booms, large amounts of spent mobile phones have manifested because of their short market life cycle and frequent model changes. The majority of spent mobile phones collected are exported or conflagrated and dumped, while only 2.5% of them are processed for recovery. The target metals to be recovered are Au, Ag, Pd, Cu, Co, and Li, depending on the salvaged parts of the spent mobile phone. The development of a cost-effective process for the recovery of Nd and Dy from spent mobile phone camera modules is important, considering the related economic and environmental aspects. In this study, the recovery of Nd, Dy, and iron (Fe) from spent mobile phone camera modules was investigated using a hydrometallurgical method. Nd, Dy, and Fe, with other minor metal ions, were first leached using an HNO3 solution. The optimum leaching condition was obtained by varying the parameters, such as the concentration of lixivant, reaction temperature, and pulp density. Thereafter, using the obtained leachate solution, Nd/Dy was extracted using trioctylphosphine oxide (TOPO), which was utilized at a selected condition in the presence of a large amount of Fe. Nd/Dy was stripped from the loaded TOPO using a hydrochloric acid (HCI) solution. After the removal of Nd/Dy, Fe was recovered via extraction with TOPO, followed by stripping with oxalic acid. The advantage of this method is that it avoids the loss of Nd/Dy, which may occur in the commonly used precipitation method for the removal of Fe. McCabe-Thiele diagrams were constructed for both the extraction and stripping of Nd/Dy and Fe. Simulated counter-current extraction and stripping experiments were also conducted to validate the results. |
| 저자 | Pan-Pan Sun, Min-woo Lee, Tae-young kim, Byoung-Jun Min, Sung-Yong Cho |
| 소속 | 전남대 |
| 키워드 | neodymium; dysprosium; iron; TOPO; hydrometallurgy; |
