Resources Recycling (자원리싸이클링)

The Korean Institute of Resources Recycling (한국자원리싸이클링학회)
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Effect of Composition on the pH and Solution Potential of Mixed Solutions of Copper and Iron Chloride

염화(鹽貨)구리와 염화철(鹽貨鐵) 혼합용액(混合溶液)의 조성(組成)이 pH와 용액전위(溶液電位)에 미치는 영향(影響)

  • Lee, Man-Seung (Department of Advanced Materials Science & Engineering, Mokpo National University) ;
  • Son, Seong-Ho (Korea Institute of Industrial Technology, Incheon Technology Service Division)
  • 이만승 (목포대학교 공과대학 신소재공학과) ;
  • 손성호 (한국생산기술연구원 인천기술지원본부)
  • Published : 2008.12.27
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Abstract

In order to simulate the leaching solution of copper sulfide ore in $FeCl_3$ solutions, synthetic solutions with composition of $FeCl_3$-$FeCl_2$-$CuCl_2$-CuCl-NaCl-HCl-$H_2O$ were prepared. The concentration of iron and copper chloride was varied from 0.1 to 1 m in synthetic solutions. The effect of composition on the mixed solution pH and potential at $25^{\circ}C$ was measured. When HCl concentration was constant, the increase of CuCl concentration increased solution pH. The increase of other solutes excluding HCl and CuCl decreased solution pH owing to the increase of the activity coefficient of hydrogen ion. A high CuCl concentration favored the redox equilibrium in the direction of Cu(I), while $FeCl_3$ had the opposite effect.

염화 제 2철용액에 의한 구리황화광의 침출액을 모사하기 위해 $FeCl_3$-$FeCl_2$-$CuCl_2$-CuCl-NaCl-HCl-$H_2O$의 조성을 지닌 합성용액을 제조하였다. 합성용액에서 염화철과 염화구리의 농도를 0.1에서 1 m까지 변화시키며 성분의 농도변화에 따른 $25^{\circ}C$에서 용액의 pH와 전위의 변화를 측정하였다. 염산의 농도가 일정한 조건에서 CuCl의 농도를 증가시키면 용액의 pH는 증가하였다. 그러나 염산과 CuCl의 농도가 일정한 조건에서 다른 용질의 농도를 증가시키면 수소이온의 활동도계수가 증가하면서 용액의 pH는 감소하였다. CuCl의 농도를 증가시키면 염화 제 1구리이온이 안정해지는 방향으로 반응이 진행하나 $FeCl_3$은 반대의 효과를 나타냈다.

Keywords

References

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