The main objective of this study is to recovery valuable metals with metal particle size distributions in waste cell phone PCBs(Printed Circuit Boards) by means of pulverization and nitric acid process. The particle size classifier also was evaluated by specific metal contents. The PCBs were pulverized by a fine pulverizer. The particle sizes were classified by 5 different sizes which were PcS1(0.2 mm below), PcS2(0.20~0.51 mm), PcS3(0.51~1.09 mm), PcS4(1.09~2.00 mm) and PcS5(2.00 mm above). Non-magnetic metals in the grinding particles were separated by a hand magnetic. And then, Cu, Co and Ni were separated by 3M nitric acid. Particle diameter of PCBs were 0.388~0.402 mm after the fine pulverizer. The sorting coefficient were 0.403~0.481. The highest metal content in PcS1. And the bigger particle diameter, the lower the valuable metals exist. The recovery rate of the valuable metals increases in smaller particle diameter with same leaching conditions. For further work, it could improve to recovery of the valuable metals effectively by means of individual treatment, multistage leaching and different leaching solvents.

Abstract
 1. 서론
 2. 실험재료 및 방법
 3. 결과 및 고찰
  3.1. 폐 PCBs의 입경별 유가금속 분포특성
  3.2. 폐 PCBs 입경별 금속 침출특성
 4. 결론
 REFERENCE

• 한영립(동아대학교 환경공학과) | Young-Rip Han (Department of Environmental Engineering, Dong-A University)
• 최영익(동아대학교 환경공학과) | Young-Ik Choi (Department of Environmental Engineering, Dong-A University) Corresponding author