• Guideline for Media-contact Recycling of Steel-Making Slag: Leaching Tests and Comparison of International Recycling Guidelines
  • Donghyun Kim1·Inseong Hwang2·Won Sik Shin1*

  • 제강슬래그의 친환경적 매체접촉형 재활용 방안: 용출시험 및 국내외 재활용 지침 비교
  • 김동현1·황인성2·신원식1*

  • This article is an open access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/4.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.


Slags from steel-making industry have been recycled at a target rate of 95% and most of them are recycled as media-contact type such as fill and cover materials in Korea. However, as they contain free phase CaO during their generation, they may not only expand and collapse upon contact with water, but high pH leachate and heavy metals leaching may occur. In this study, the Korean leaching procedure (KLP) and up-flow percolation test were performed for the samples collected from 17 steel-making production plants in Korea. The waste quality criteria were met in all tests, but pH of the samples was above 10. There are no regulations on the pH of leachate in most of the countries, however, Germany, Italy, and Australia have set a pH range of 10 to 13 for the leachates. Although slag leachate cannot be considered hazardous based only on its high pH, it is necessary to reduce the pH of leachate to minimize the impact on the surrounding environment. Furthermore, conflicting regulations on wastes handling and management in Korea created confusion on the types of wastes subject to recycling. Therefore, an appropriate management plan for steel-making slags needs to be established. To this end, this study attempted to provide a guideline for managing steel-making slag waste by considering international guidelines and current management practices in Korea.

Keywords: Steel-making Slag, Leaching test, Media-contact recycling, Guideline

This Article

  • 2024; 29(1): 39-50

    Published on Feb 29, 2024

  • 10.7857/JSGE.2024.29.1.039
  • Received on Jan 10, 2024
  • Revised on Jan 26, 2024
  • Accepted on Feb 2, 2024

Correspondence to

  • Won Sik Shin
  • E-mail: wshin@knu.ac.kr