자원리싸이클링 (Resources Recycling)

  • 제28권2호
  • /
  • Pages.31-39
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  • 2019
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  • 2765-3439(pISSN)
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  • 2765-3447(eISSN)
한국자원리싸이클링학회 (The Korean Institute of Resources Recycling)
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건식제련용 동 함유 슬러지 펠렛 제조 및 물리적 특성평가

Analyses of Physical Properties of Copper-contained Sludge Pelletized for Applied Pyro-metallurgical Process

  • 김수윤 (강원대학교 에너지.자원공학과) ;
  • 김영진 (한국석회석신소재연구소 연구개발실) ;
  • 김승현 (강원대학교 에너지.자원공학과) ;
  • 이재령 (강원대학교 에너지.자원공학과)
  • 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)
  • 투고 : 2018.12.24
  • 심사 : 2019.04.15
  • 발행 : 2019.04.30
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초록

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.

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).

키워드

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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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