• 자원리싸이클링
• /
• 제9권4호
• /
• pp.50-55
• /
• 2000

알루미늄 호일 스크랩의 건식 및 습식 볼밀링에 의하여 알루미늄 플레이크 분말을 체조하는 재활용 기술에 대해 여 연구하였다. 볼밀링시 알루미늄 호일 스크랩들은 볼에 의한 미소 단조에 의하여 서로 층상으로 겹쳐지고 연산되면서 작은 호일로 쪼개진 후 플레이크 분말로 변하였다. 이러한 스크랩중에 $60\mu\textrm{m}$ 이하의 호일 스크랩은 볼밀링에 의하여 알루미늄 페이스트로 재활용이 가능하였고 초기 호일의 두께가 작을수록 쉽게 플레이크 분말화가 가능 하였다. 알루미늄 호일 스크랩의 봉밀링에 의하여 얻은 풀레이크 분말을 함유하는 알루미늄 페이스트와 가스 분사된 분말을 초기원료로 사용하여 불밀링한 플레이크 분말을 함유하는 페]이스트를 유리관위에 폐인팅한 후 외관 및 광택도를 비교한 결과, 그 특성은 유사하였다.

• 연구논문집
• /
• 통권29호
• /
• pp.131-139
• /
• 1999

The effect of ball milling conditions in the milling of aluminium foil scraps was studied. Initial foil thickness, ball size. content of oleic acid. weight ratio of mineral spirits/foil. charged amount of foil were varied in wet ball milling process. It is impossible to make flake powders by milling of foil scraps with thickness $120 \mum$. As foil thickness decreases from $60\mum$ to $6.5\mum$, Mean size of powder milled for 30 h decreases from 107 µm to 17 µm. Bigger ball is slightly beneficial for milling of foils to the flake powders due to the larger impact energy produced by them. It is impossible to mill the foil without oleic acid to fabricate the flake powder. As content of oleic acid increases from 1.5 % to 5 %, mean size of flake powder milled for 30 h is drastically decreased. For the mineral spirits content below 50 %, foil scrap was not milled because sliding motion of balls by lubricant effect between balls and wall of container. As weight ratio of mineral spirits and foil increase over 100 %, foils were milled powders with mean powder size 15 - 20 때 irrespective of mineral spirits content due to reduced lubricant effect. As charged amount of foil decreases, mean powder size decreases due to increased collision frequency between ball and foil.

• Bulletin of the Korean Chemical Society
• /
• 제34권3호
• /
• pp.851-855
• /
• 2013

This paper describes an environmentally friendly process for the recovery of $LiFePO_4$ cathode materials from scrap electrodes by a simple thermal treatment method. The active materials were easily separated from the aluminum substrate foil and polymeric binders were also decomposed at different temperatures ($400^{\circ}C$, $500^{\circ}C$, $600^{\circ}C$) for 30 min under nitrogen gas flow. The samples were characterized by X-ray diffraction (XRD), scanning electronic microscopy (SEM), Raman spectroscopy, Thermogravimetric analysis (TGA), and differential scanning calorimetry (DSC). The electrochemical properties of the recycled $LiFePO_4$ cathode were evaluated by galvanostatic charge and discharge modes. The specific charge/discharge capacities of the recycled $LiFePO_4$ cathode were similar to those of the original $LiFePO_4$ cathode. The $LiFePO_4$ cathode material recovered at $500^{\circ}C$ exhibits a somewhat higher capacity than those of other recovered materials at high current rates. The recycled $LiFePO_4$ cathode also showed a good cycling performance.