제강슬래그의 친환경적 매체접촉형 재활용 방안: 용출시험 및 국내외 재활용 지침 비교

초록

Slags from steel-making industry have been recycled at a target rate of 95% and most of them are recycled as mediacontacttype 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 mayoccur. In this study, the Korean leaching procedure (KLP) and up-flow percolation test were performed for the samplescollected from 17 steel-making production plants in Korea. The waste quality criteria were met in all tests, but pH of thesamples 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 hazardousbased only on its high pH, it is necessary to reduce the pH of leachate to minimize the impact on the surroundingenvironment. Furthermore, conflicting regulations on wastes handling and management in Korea created confusion on thetypes of wastes subject to recycling. Therefore, an appropriate management plan for steel-making slags needs to beestablished. To this end, this study attempted to provide a guideline for managing steel-making slag waste by consideringinternational guidelines and current management practices in Korea.

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