Resources Recycling (자원리싸이클링)

The Korean Institute of Resources Recycling (한국자원리싸이클링학회)
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Influence of pH on Leaching Behavior of Phosphorous from Steelmaking Slag

제강슬래그에서 인의 침출 거동에 대한 pH의 영향

  • Kim, Jeong-In (Department of Materials Engineering & Science, Chosun University) ;
  • Kim, Sun-Joong (Department of Materials Engineering & Science, Chosun University)
  • 김정인 (조선대학교 재료공학과) ;
  • 김선중 (조선대학교 재료공학과)
  • Received : 2016.09.19
  • Accepted : 2016.11.18
  • Published : 2016.12.31
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Abstract

In this study, leaching process to extract phosphorus from the steelmaking slag was investigated for using the fertilizer resources of agriculture. In general, the phosphorus of steelmaking slag is formed as $C_2S-C_3P$ solid solution, and also, this solid solution is soluble in water more than the other phase in slag, and less than free CaO phase. In the present experiment, the influence of pH on the leaching behavior of various elements from the steelmaking slag was investigated by using multi-component steelmaking slag. When the pH was decreased, the concentration of Ca, Si, P and Fe in solution from the steelmaking slag was increased. Furthermore, at a pH of 3, the concentration of P ion in solution was decreased as leaching time increased. It is considered that the decrement of P was caused from the precipitation reaction between P ion and Fe ion in solution.

본 연구는 제강슬래그로부터 인성분을 추출하여 농업용 비료의 자원으로서 사용하기 위한 침출공정을 연구하였다. 일반적으로 제강 슬래그에 함유되어 있는 인성분은 $C_2S-C_3P$상에 고용되어 있고, 이 고용체는 슬래그 내의 free-CaO 다음으로, 다른 상들보다 수용해성이 크다. 본 실험에서는 다원계 슬래그를 이용하여, 다양한 원소들의 용해거동에 미치는 pH의 영향을 알아보았다. 낮은 pH에서 제강슬래그로부터 수용액 중 Ca, Si, P, Fe의 농도는 증가되었다. pH가 3인 경우, 수용액 중 P 이온의 농도는 시간에 따라 감소하였고, P이온과 Fe이온과의 침전 반응을 감소 원인으로 고찰하였다.

Keywords

References

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