Resources Recycling (자원리싸이클링)

The Korean Institute of Resources Recycling (한국자원리싸이클링학회)
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Concentration of As Component in Pb Dross by Magnetic Separation

자력선별에 의한 납드로스 중 비소성분의 농축

  • Choi, Sanghyeon (Korea Maritime and Ocean University, Department of Energy and Resources Engineering) ;
  • Na, Hyunjin (Korea Maritime and Ocean University, Department of Energy and Resources Engineering) ;
  • Yoo, Kyoungkeun (Korea Maritime and Ocean University, Department of Energy and Resources Engineering)
  • 최상현 (한국해양대학교 에너지자원공학과) ;
  • 나현진 (한국해양대학교 에너지자원공학과) ;
  • 유경근 (한국해양대학교 에너지자원공학과)
  • Received : 2019.05.20
  • Accepted : 2019.06.17
  • Published : 2019.06.30
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Abstract

Pb dross has been generated from recycling processes of waste acid lead batteries, and proper treatment of Pb dross was required because it contains As component, which has been found to be toxic. This study is aimed at concentrating As component by magnetic separation of ground product obtained from ball and mixer milling of Pb dross. No arsenic component was detected in the non-magnetic product of 10000 G magnetic separation using ground product with $-150{\mu}m$ by ball milling, and As could be concentrated upto 18.87 % by further 2000 G magnetic separation. The ball mill ground product with over $300{\mu}m$ was ground again by mixer mill to less than $150{\mu}m$, and then magnetic-separated by 4000 G followed by 2000 G magnet. The As component was concentrated upto 21.021 % in the magnetic fraction of 2000 G. It was confirmed that As component exsit as $Fe_2As$ by XRD measrument. These results indicate that As component could be concentrated from 0.6 % in the Pb dross to 21.021 % in the magnetic fraction by milling followed by magnetic separation.

폐납축적지 재활용 공정에서 발생한 납드로스는 비소 등의 유해물질을 함유하고 있어 적절한 처분이 요구되고 있다. 본 연구에서는 볼밀과 믹서밀로 분쇄한 납드로스를 대상으로 자력선별을 실시하여 비소 성분을 농축하고자 하였다. 볼밀에 의해 $150{\mu}m$ 이하로 분쇄된 시료를 대상으로 10000 G와 2000 G의 자석봉으로 순차적 자력선별을 실시한 결과, 10000 G의 비자착물에서는 비소성분이 검출되지 않아 유해물질이 제거된 산물을 확보가능하였다. 추가적인 2000 G 자력선별의 자착물에는 비소가 18.87 %까지 농축되는 것을 확인하였다. 또한 볼밀 분쇄시 $300{\mu}m$ 이상인 분쇄산물을 대상으로 믹서밀로 $150{\mu}m$ 이하로 분쇄하고 4000 G와 2000 G의 자석봉으로 순차적인 자력선별을 실시한 결과 2000 G의 자착물에 비소가 21.021 %로 농축된 것이 확인되었다. 비소는 XRD 결과에서 $Fe_2As$로 존재하는 것을 확인하였으며, 분쇄와 자력선별에 의해 비소 성분이 원시료의 0.6 %에서 21.021 %까지 농축되는 것을 확인하였다.

Keywords

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Fig. 1. World Pb recycing market size (2013 ~ 2018).

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Fig. 2. Metal distribution in magnetic and non-magnetic fraction after 10000 G magnetic separation of ball milling ground product of Pb dross.

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Fig. 3. Metal distribution in magnetic and non-magnetic fraction after 2000 G magnetic separation of magnetic product obtained from 10000 G magnetic separation.

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Fig. 4. Metal distribution in magnetic and non-magnetic fraction after 4000 G magnetic separation of mixer milling ground product.

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Fig. 5. Metal distribution in magnetic and non-magnetic fraction after 2000 G magnetic separation of magnetic product obtained from 4000 G magnetic separation.

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Fig. 7. SEM and EDS images of magnetic fracion of mixer milling ground product.

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Fig. 6. XRD patterns of magnetic and non-magnetic fraction of mixer milling ground product.

Table 1. Chemical component in Pb dross

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References

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  3. QYResearch, 2018 : Customized Global Metal Waste and Recycling Market Size, Status and Forecast 2025, QYR Chemical & Material Research Center, San Gabriel Valley, p.14.
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  6. Oh, J., Yoo, K., Bae, M., Kim, S., and Alorro, R. D., 2019 : The Adsorption Behaviors of Gold Ions in Simulated Leachate Using Magnetite, J. Korean Soc. Miner. Energy Resour. Eng., 56(1), pp.79-85. https://doi.org/10.32390/ksmer.2019.56.1.079
  7. Katsuraki, H. and Achiwa, N., 1966 : The magnetic structure of $Fe_2As$. J. Phys. Soc. Jpn. 21(11), pp.2238-2243. https://doi.org/10.1143/JPSJ.21.2238

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