Resources Recycling (자원리싸이클링)

The Korean Institute of Resources Recycling (한국자원리싸이클링학회)
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Distribution Behavior of Bi and Pb Between Molten PbO-SiO2 Slag and Bi

용융(熔融) PbO-SiO2계(系) 슬래그와 Bi 사이의 Bi와 Pb의 분배거동(分配擧動)

  • Kim, Se-Jong (Dept. of Materials Science and Metallurgical Engineering, Kyungpook National University) ;
  • Kim, Eung-Jin (Dept. of Materials Science and Metallurgical Engineering, Kyungpook National University) ;
  • Sohn, Ho-Sang (Dept. of Materials Science and Metallurgical Engineering, Kyungpook National University)
  • 김세종 (경북대학교 금속신소재공학과) ;
  • 김응진 (경북대학교 금속신소재공학과) ;
  • 손호상 (경북대학교 금속신소재공학과)
  • Received : 2012.07.10
  • Accepted : 2012.09.17
  • Published : 2012.10.30
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Abstract

The equilibrium distribution of bismuth and lead between molten PbO-$SiO_2$ slag and bismuth phase was studied in the temperature range of $775^{\circ}C$ to $850^{\circ}C$ in a MgO crucible. The oxygen partial pressure of atmosphere was controlled by $P_{CO2}/P_{CO}$ ratio. The value of $(%PbO)_{slag}/[%Pb]_{metal}$ increased with increasing $SiO_2$ content of slag, and the value of $(%Bi_2O_3)_{slag}/[%Bi]_{metal}$ decreased with increasing $SiO_2$ content of slag. The concentration of Pb in metal increased with increasing temperature. These experimental results agreed well with the thermodynamic prediction.

용융 PbO-$SiO_2$계 슬래그와 Bi를 $775{\sim}850^{\circ}C$의 마그네시아 도가니 중에서 평형시켜 Pb와 Bi의 평형분배에 대하여 조사하였다. 분위기 중의 산소분압은 $P_{CO2}/P_{CO}$의 비율을 조정하여 제어하였다. Pb의 분배비인 (%PbO)/[%Pb]는 슬래그 중의 $SiO_2$ 농도가 증가함에 따라 증가하였으며, Bi의 분배비인 ($%Bi_2O_3$)/[%Bi]는 슬래그 중의 $SiO_2$ 농도가 증가함에 따라 감소하였다. 그리고 반응 온도가 높을수록 금속 상중의 Pb 농도는 증가하였다. 이러한 결과는 열역학적으로 예측한 결과와 잘 일치하였다.

Keywords

References

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