Journal of the Mineralogical Society of Korea (한국광물학회지)

The Mineralogical Society of Korea (한국광물학회)
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TiO2-catalytic UV-LED Photo-oxidation of Cyanide Contained in Mine Wastewater

광산폐수 내 시안 제거를 위한 TiO2와 UV-LED를 이용한 광촉매 산화

  • Kim, Seong Hee (Department of Earth and Environmental Sciences and Research Institute of Natural Science, Gyeongsang National University) ;
  • Lee, Sang-Woo (Department of Earth and Environmental Sciences and Research Institute of Natural Science, Gyeongsang National University) ;
  • Cho, Hyen Goo (Department of Earth and Environmental Sciences and Research Institute of Natural Science, Gyeongsang National University) ;
  • Kim, Young-Ho (Department of Earth and Environmental Sciences and Research Institute of Natural Science, Gyeongsang National University) ;
  • Kim, Soon-Oh (Department of Earth and Environmental Sciences and Research Institute of Natural Science, Gyeongsang National University)
  • 김성희 (경상대학교 자연과학대학 지구환경과학과 및 기초과학연구소) ;
  • 이상우 (경상대학교 자연과학대학 지구환경과학과 및 기초과학연구소) ;
  • 조현구 (경상대학교 자연과학대학 지구환경과학과 및 기초과학연구소) ;
  • 김영호 (경상대학교 자연과학대학 지구환경과학과 및 기초과학연구소) ;
  • 김순오 (경상대학교 자연과학대학 지구환경과학과 및 기초과학연구소)
  • Received : 2014.10.28
  • Accepted : 2014.12.10
  • Published : 2014.12.30
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Abstract

Cyanidation method has been used to extract high-purity gold and silver in mining industry. Such mining activities have used a large amount of cyanide, and the mine wastewater contained a high level of cyanide has brought about pollution of surrounding aqueous environments. This research was initiated to study $TiO_2$-catalytic UV-LED photo-oxidation to remove cyanide from the mine wastewater. UV lamp has been generally used as a light source in conventional photo-oxidation so far, but it shows numerous drawbacks. For this reason, this study focused on the evaluation of applicability of UV-LED as an alternative light source in cyanide photo-oxidation process. Three types of $TiO_2$ photo-catalyst were compared in terms of performance of photo-oxidation of cyanide, and the results show that Degussa P25 was the most efficient. In addition, four types of UV-LED were tested to compare their efficiencies of cyanide photo-oxidation, and their efficacy was increased in the order of 365 nm lamp-type > 365 nm can-type > 280 nm can-type > 420 nm lamp-type. Not only did this study demonstrate that UV-LED can be used in the photo-oxidation of cyanide as an alternative light source of UV lamp, but also confirmed that the performance of photo-oxidation was significantly influenced by the type of $TiO_2$ catalysts.

광산에서 순도 높은 금은을 추출하기 위해 청화법을 이용해 왔다. 이러한 광산 활동에서 많은 양의 시안이 사용되어 왔으며 이에 따라 고농도의 시안을 함유한 광산폐수가 발생되어 광산 주변 지역의 수계를 오염시킬 수 있다. 본 연구에서는 이러한 시안함유 광산폐수 및 침출수로부터 시안을 제거하기 위하여 $TiO_2$ 광촉매와 UV-LED 광원을 이용한 광산화 공정에 대하여 연구하였다. 기존 광산화 공정에서는 주로 UV 램프가 광원으로 많이 사용되었지만 여러 가지 단점으로 인하여 본 연구에서는 그 대체 광원으로 UV-LED의 적용 가능성을 평가하였다. 세 종류의 $TiO_2$의 광산화 효율을 평가한 결과, 아나타제와 루틸이 혼합된 Degussa P25가 광산화 효율이 가장 좋은 것으로 확인되었다. 또한 형태와 파장이 다른 네 종류의 UV-LED를 비교 평가한 결과, 365 nm 램프형 > 365 nm 캔형 > 280 nm 캔형 > 420 nm 램프형 순으로 제거효율이 좋은 것으로 나타났다. 본 연구는 UV-LED는 기존의 UV 램프의 단점을 극복할 수 있는 대체광원으로서 광산화 공정에 적용 가능하다는 것을 입증하였으며, 시안의 광산화 효율은 $TiO_2$ 광촉매의 종류에도 영향을 받는다는 것을 확인하였다.

Keywords

References

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