Resources Recycling (자원리싸이클링)

The Korean Institute of Resources Recycling (한국자원리싸이클링학회)
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Copper Solubility in Al2O3-CaO-SiO2-MgO Slag

Al2O3-CaO-SiO2-MgO계 슬래그 중 Cu의 용해도

  • Han, Bo-Ram (Department of Materials Science and Metallurgical Engineering, Kyungpook National University) ;
  • Kim, Eung-Jin (Department of Materials Science and Metallurgical Engineering, Kyungpook National University) ;
  • Sohn, Ho-Sang (Department of Materials Science and Metallurgical Engineering, Kyungpook National University)
  • 한보람 (경북대학교 금속신소재공학과) ;
  • 김응진 (경북대학교 금속신소재공학과) ;
  • 손호상 (경북대학교 금속신소재공학과)
  • Received : 2013.10.11
  • Accepted : 2014.01.07
  • Published : 2014.02.28
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Abstract

In this study, the solubility of Cu, which is a main metal component of wasted PCB, in $CaO-SiO_2-Al_2O_3-MgO$ slag system was investigated. Each 20 grams of Cu chips and the quaternary slag manufactured was placed in an carbon crucible and melted for 10 hours in the temperature between 1673 K and 1825 K to confirm the equilibrium state. The oxygen partial pressure was controlled by the ratio of CO and Ar gas in the range of $10^{-17.23}$ to $10^{-15.83}$ atm. The concentration of Cu in the slag increased with increasing oxygen partial pressure, slag basicity, and MgO content in the slag. The concentration of Cu in the slag decreased with increasing temperature. The Cu dissolution reaction in the slag is an exothermic reaction.

본 연구에서는 폐 PCB의 주성분인 Cu와 $CaO-SiO_2-Al_2O_3-MgO$계 슬래그의 평형실험에 의해 Cu의 용해도에 대하여 조사하였다. 1673 K~1825 K 범위에서 일정한 비율로 미리 용융된 4원계 슬래그와 Cu를 흑연 도가니에 각각 20 g 장입한 후, 10시간동안 평형 을 유지하였다. 분위기 중의 산소분압은 CO가스와 Ar가스의 비율을 조절하여 $10^{-17.23}{\sim}10^{-15.83}$ atm 범위로 제어하였다. 평형산소 분압과 염기도 및 MgO 농도가 증가할수록 슬래그 중 Cu의 농도는 증가하였다. 그리고 반응 온도가 높을수록 슬래그 중의 Cu의 농도는 감소하였다. 슬래그 중으로 용해되는 Cu의 반응은 발열반응이다.

Keywords

References

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