Resources Recycling (자원리싸이클링)

The Korean Institute of Resources Recycling (한국자원리싸이클링학회)
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Analyses of Physical Properties of Copper-contained Sludge Pelletized for Applied Pyro-metallurgical Process

건식제련용 동 함유 슬러지 펠렛 제조 및 물리적 특성평가

  • Kim, Suyun (Dept. of Energy & Resources Engineering, Kangwon National University) ;
  • Kim, Youngjin (Department of Research and Development, Korea Institute of Limestone and Advanced Materials) ;
  • Kim, Seunghyun (Dept. of Energy & Resources Engineering, Kangwon National University) ;
  • Lee, Jaeryeong (Dept. of Energy & Resources Engineering, Kangwon National University)
  • 김수윤 (강원대학교 에너지.자원공학과) ;
  • 김영진 (한국석회석신소재연구소 연구개발실) ;
  • 김승현 (강원대학교 에너지.자원공학과) ;
  • 이재령 (강원대학교 에너지.자원공학과)
  • Received : 2018.12.24
  • Accepted : 2019.04.15
  • Published : 2019.04.30
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Abstract

The pelletizing of printed circuit board (PCB) sludge was researched for copper recovery in pyrometallurgical process. This pelletizing was carried out by using self-manufactured compression-type apparatus after pre-treatments (drying, water scrubbing, size classification) were proceeded. The physical properties (compression strength and drop-breakage test) were tested with a change of sludge sizing and the number of compression. In the case of using the undersized sludge of #140, its properties were improved to 0.6 MPa and 9.3 times. Moreover, they increased to 0.82 MPa and 19.0 times by using the #140 ~ 325 sludge. These imply that the packing density increases due to the elimination of large-sized sludge (#140), and also the weight of required binder decreases by the removal of fine-sized sludge (#325).

인쇄회로기판(PCB) 제조 공정 중 발생된 슬러지로부터 구리성분을 건식제련방법으로 회수하기 위해서 슬러지를 원료로 한 펠렛화 연구를 진행하였다. 슬러지 펠렛화를 위해 건조, 해쇄, 입도분급의 전처리 실시하였고, 혼합 및 압축장치를 포함한 펠렛화 기기를 개발하였다. 제조된 펠렛의 물리적 특성평가는, 슬러지 입도, 펠렛화 압축 횟수를 변화시키면서 비파괴 낙하횟수, 압축강도를 측정하였다. #140 mesh over의 입자를 제거한 경우, 펠렛의 특성은 0.6 MPa, 9.3회로 향상되었으며, 여기에 #325 under 입자를 한번 더 제거한 경우 0.82 MPa, 19.0회로 더욱 더 향상되었다. 이는 조립자의 경우, 충진밀도를 감소시키고, 미립자의 경우 성형에 요구되는 점결제의 투입량을 증가시키기 때문에 나타난 결과로 판단된다.

Keywords

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Fig. 1. The flow chart of this study.

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Fig. 2. Schematic diagram and photo for mixer used in this study.

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Fig. 3. Schematic diagram and photo for compressor used in this study.

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Fig. 4. Manufactured pellets.

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Fig. 5. Sludge condition after drying.

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Fig. 6. Size distribution depending on size range after grinding for 20 min.

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Fig. 7. Yield of pellets with a change of size range of sample.

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Fig. 8. Compressive strength of pellets with a change of size range of sample.

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Fig. 9. Drop count of pellets with a change of size range of sample.

Table 1. Water content of copper-containing sludge

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Table 2. Chemical composition of dried copper-containing sludge

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Table 3. Possibility of pelletizing depending on use of binder

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