Journal of the Mineralogical Society of Korea (한국광물학회지)

The Mineralogical Society of Korea (한국광물학회)
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Mineralogical Phase Transform of Salt-roasted Concentrate and Enhancement of Gold Leaching by Chlorine-hypochlorite Solution

소금-소성정광에 대한 광물학적 상변화와 염소-차아염소산 용액을 이용한 금 용출 향상

  • Kim, Bong-Ju (Department of Energy and Resource Engineering, Chosun University) ;
  • Cho, Kang-Hee (Department of Energy and Resource Engineering, Chosun University) ;
  • Oh, Su-Ji (Department of Energy and Resource Engineering, Chosun University) ;
  • Choi, Seoung-Hwan (Department of Energy and Resource Engineering, Chosun University) ;
  • Choi, Nag-Choul (Engineering Research Institute, Chonnam National University) ;
  • Park, Cheon-Young (Department of Energy and Resource Engineering, Chosun University)
  • 김봉주 (조선대학교 에너지자원공학과) ;
  • 조강희 (조선대학교 에너지자원공학과) ;
  • 오스지 (조선대학교 에너지자원공학과) ;
  • 최승환 (조선대학교 에너지자원공학과) ;
  • 최낙철 (전남대학교 공업기술연구소) ;
  • 박천영 (조선대학교 에너지자원공학과)
  • Received : 2012.11.13
  • Accepted : 2013.03.21
  • Published : 2013.03.31
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Abstract

In order to optimize the gold leaching process from refractory sulfide concentrate, a chlorine-hypochlorite solution with varying concentrations and temperatures were applied to salt-roasted concentrate. The concentrate consisted of pyrite, chalcopyrite, and galena, which were turned into hematite through air-roasting at $750^{\circ}C$. Also these concentrates were changed into hematite and nantokite (CuCl)) through salt (NaCl)-roasting at $750^{\circ}C$. The results of the gold leaching experiments showed that the best gold leaching parameters were obtained when the hydrochloric acid-sodium hypochlorite mix was at a ratio of 1 : 2, the added concentration was 1.0 M concentration, the pulp density was 1.0%, and the leaching was done at a $60^{\circ}C$ leaching temperature. The leaching rate for gold was much greater in the roasted concentrate than in the raw concentrate. The leaching rate was greater in the salt-roasted concentrate than in the plain roasted concentrate too. From XRD analysis, quartz was found in the salt-roasted concentrate and in the solid residue from the chlorine-hypochlorite leaching solution at $60^{\circ}C$.

저항성 황화광물 정광으로부터 최적의 gold를 용출시키기 위하여 염소-차아염소산 용액과 다양한 온도와 농도를 소금소성정광에 적용하였다. 정광은 황철석, 황동석, 방연석으로 구성되었으며, 공기 중에서 $750^{\circ}C$ 소성처리하자 적철석으로 변환되었고, 소금으로 소성처리하자 적철석과 난토카이트(nantokite, CuCl)으로 변환되었다. 다양한 변수로 용출실험을 수행한 결과, 염소-차아염소산 나트륨 혼합 비율 1 : 2에서, $FeCl_3$ 첨가량 1.0 M에서, 광액농도 1.0%에서, 그리고 용출온도 $60^{\circ}C$에서 최대의 금 용출율을 얻었다. 금 용출율은 정광에서보다 소성정광에서 더 높게 용출되었고, 소성정광에서보다 소금소성정광에서 더 높게 용출되었다. XRD 분석 결과, 소금소성정광에서, 그리고 $60^{\circ}C$의 염소-차아염소산 용출용액 고체 잔유물에서 석영이 관찰되었다.

Keywords

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