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Development of Fluorite-free Desulfurizing Agent for Molten Iron using Al-dross and Ladle Slag

알루미늄 드로스와 래들 슬래그를 활용한 무형석 용선 탈황제 개발

  • Lee, Chang-Hyun (Dept of Advanced Materials Science & Engineering, MokPo National University) ;
  • Koo, Yeon-Soo (Dept. of Manufacture and Metallurgical Engineering, Gwangyang Health Sciences University) ;
  • Lee, Man-Seung (Dept of Advanced Materials Science & Engineering, MokPo National University)
  • 이창현 (목포대학교 공과대학 신소재공학과) ;
  • 구연수 (광양보건대학교 제철금속과) ;
  • 이만승 (목포대학교 공과대학 신소재공학과)
  • Received : 2018.08.22
  • Accepted : 2018.09.14
  • Published : 2018.10.31

Abstract

In developing an optimum steelmaking process, the purity of the product, environmental impact, capability and cost of the process should be considered. Desulfurization of molten iron is conducted during preliminary treatment stage before converter operation. Although fluorite is added as a desulfurizing agent in CaO and $CaCO_3$ based agents, the concentration of fluorine in slag is strictly regulated. In order to develop desulfurizing agent without fluorine, CaO was mixed with Al dross and ladle slag containing alumina. The characteristics and desulfurizing capacity of the CaO based desulfurizing agent thus prepared were tested by varying temperature of Kanvara Reactor. Our results showed that the desulfurizing capacity of the samples prepared in this work was found to be similar to that of the traditional desulfurizing agents with fluorine.

제철기술은 고순도, 친환경화와 더불어 공정능력 및 제조원가를 고려한 최적의 공정개발이 요구되고 있다. 전로조업의 전 공정인 용선예비처리 단계에서 탈황처리가 실시된다. 탈황제로 CaO와 $CaCO_3$에 반응촉진제로 형석이 첨가되어 사용되지만, 슬래그 중 불소농도의 규제로 인하여 사용이 제한되고 있다. 본 연구에서는 형석을 대체하기 위해 CaO에 알루미늄 드로스와 알루미나를 함유한 래들 슬래그를 배합하여 첨가하는 방안을 제시하였다. 알루미늄 드로스와 알루미나 함유 래들 슬래그를 CaO에 배합하여 제조한 탈황제의 온도에 따른 물성과 KR(Kanvara Reactor)에서 탈황능을 비교하는 시험을 하였다. 본 연구에서 개발한 탈황제는 형석을 기반으로 제조한 종전의 탈황제와 탈황능이 동일하였다.

Keywords

References

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