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Aggregation of Thin Copper Wire by Ball Milling Treatment

볼밀처리에 의한 구리세선의 응집

  • Hwang, Jisu (Department of Energy and Resources Engineering, Koream Maritime and Ocean University) ;
  • Cho, Seong Su (Department of Energy and Resources Engineering, Koream Maritime and Ocean University) ;
  • Seong, Chang Jun (Department of Energy and Resources Engineering, Koream Maritime and Ocean University) ;
  • Yoo, Kyoungkeun (Department of Energy and Resources Engineering, Koream Maritime and Ocean University)
  • 황지수 (한국해양대학교 에너지자원공학과) ;
  • 조성수 (한국해양대학교 에너지자원공학과) ;
  • 성창준 (한국해양대학교 에너지자원공학과) ;
  • 유경근 (한국해양대학교 에너지자원공학과)
  • Received : 2020.07.06
  • Accepted : 2020.08.13
  • Published : 2020.08.28

Abstract

Recycling processes of spent copper wires cosisnt of several steps of cutting and chopping processes for peeling covering materials followed by gravity separation processes, where copper is recovered. Because copper thin wires could be lost during further recycling processes, the wire may need to be further treated. In the present study, the copper thin wire was treated with ball milling to prevent the loss. Since the aggregation of the copper wire could be formed by bending and entangling the copper wire each other, the degree of flexion of the copper wire was measured after ball milling. When the 0.5 cm and 3 cm copper wires were used, the 0.5 cm copper wire was not bent and the 3 cm copper wires were aggregated regardless of the ball addition. When the 1 cm and 2 cm copper wires were used, the degree of flexion was remarkable when the balls were added. In the tests using 2 cm copper wires, the aggregation ratio of the copper wire gradually increased with the amount of the 20 mm alumina ball, and when 200 ml of 30 mm alumina ball was used, the aggregation ratio increased to 89.29 %, but after increasing the ball amount further, the aggregation ratio decreased. Thus, it is expected that the loss of the copper wire could be reducedif when the copper thin wire is treated with ball milling by the aggregation of copper thin wires.

폐구리전선의 재활용 공정은 여러 단계의 절단공정으로 피복재로부터 구리선을 분리 후 비중선별공정으로 구리선을 회수하는 방법이 사용되고 있다. 구리세선은 이후의 재활용 공정에서 손실 등의 우려가 있어 추가적인 처리가 필요하다. 이 연구에서는 볼밀처리를 통해 구리세선의 응집체를 구성하여 손실을 방지하고자 하였다. 구리선의 응집은 구리선이 휘어져 서로 얽히는 과정에서 발생하므로 본 연구에서는 볼밀처리 후 구리전선의 굴곡도를 측정하였다. 0.5 cm와 3 cm의 구리세선을 사용하였을 때 볼의 투입과 상관없이 0.5 cm 구리세선은 휘지 않았고, 3 cm의 구리세선은 모두 응집되었다. 1 cm와 2 cm의 구리선을 사용하였을 때는 볼을 투입하였을 때 구리선의 휨 현상이 현저하였다. 2 cm의 구리세선을 사용한 실험에서 20 mm 알루미나 볼의 투입량을 증가시킴에 따라 구리선의 응집율은 점차적으로 증가하였고 30 mm 알루미나 볼을 사용하였을 때 200 ml 투입한 경우 응집율이 89.29 %로 증가한 후 볼 투입량을 증가시키면 응집율이 감소하였다. 이와 같이 구리세선을 볼밀 처리하면 구리세선의 응집체 형성이 가능하여 구리세선의 손실이 감소될 것으로 기대된다.

Keywords

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