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2024 Vol.29, Issue 1 Preview Page
Guideline for Media-contact Recycling of Steel-Making Slag: Leaching Tests and Comparison of International Recycling Guidelines

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

Donghyun Kim1
,
Inseong Hwang2
,
Won Sik Shin1*
김동현 1
,
황인성 2
,
신원식 1*
1School of Architecture, Civil, Environmental and Energy Engineering, Kyungpook National University
2Department of Civil & Environmental Engineering, Pusan National University
1경북대학교 건설환경에너지공학부
2부산대학교 사회환경시스템공학과
*Corresponding Author
29 February 2024. pp. 39-50
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Abstract

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
References

References

1

Bäverman, C., 1997, Long-term leaching mechanisms of ashes and slag; combining laboratory experiments with computer simulations, Doctor¡¯s Thesis, Royal Insitute of Tehcnology, Stockholm, Sweden.

2

BFJ, 2022, Verordnung über Anforderungen an den Einbau von mineralischen Ersatzbaustoffen in technische Bauwerke(Ersatzbaustoffverordnung – ErsatzbaustoffV), Bundesamt Für Justiz, Germany.

3

BMUV, 2022, Blue Angel, Bundes Ministerium fur Umwelt, Naturschutz, nukleare sicherheit und Verbraucherschutz, https://www.blauer-engel.de/en [accessed 18.10.22]

4

CINDERELA, 2021, End of waste criteria protocol for waste used as aggregates, CINDERELA project report, European Commission.

5

Dayioglu, A.Y. and Aydilek, A.H., 2019, Effect of pH and subgrade type on trace-metal leaching from steel-slag embankments into groundwater, J. Mater. Civ. Eng., 31(8), 04019149.

10.1061/(asce)mt.1943-5533.0002777
6

DIBt, 2022, Muster Verwaltungsvorschrift-Technische Baubestimmungen, Deutsches Institut Für Bautechnik, Germany.

7

DIN 19528, 2015, Leaching of solid mateirals – Batch test for the examination of the leaching behavior of inorganic and organic substances at a liquid to solid ratio of 2 L/kg, Deutsches Institut fur Normung, Germany.

8

JEA, 2022, Eco Mark office, Japan Environment Association, Japan. https://www.ecomark.jp/nintei/index_en.html [accessed 18.10.22]

9

JIS A 5011, 2018a, Slag Aggregate for Concrete, Japanese Industrial Standard, Japan. https://kikakurui.com/a5/A5011-1-2018-01.html [accessed 30.04.22]

10

JIS A 5015, 2018b, Slag for Road Construction, Japanese Industrial Standard, Japan. https://kikakurui.com/a5/A5015-2018-01.html [accessed 30.04.22]

11

JIS K 0058-1, 2005, Test methods for chemicals in slags, Part 1: Leaching test method, Japanese Industrial Standard, Japan.

12

JRC, 2009, End-of-Waste Criteria, Joint Research Centre Institute for Prospective Technological Studies, European Commission.

13

JRC, 2014, Study on methodological aspects regarding limit values for pollutants in aggregates in the context of the possible development of end-of waste criteria under the EU Waste Framework Directive, Joint Research Centre Institute for Prospective Technological Studies, European Commission.

14

KATS, 2019a, Iron and Steel Slag for Road Construction, Korean Agency for Technology and Standards, Korea.

15

KATS, 2019b, Iron and Steel Slag for Embanking, Covering and Backfills, Korean Agency for Technology and Standards, Korea.

16

KMOE, 2016, Comprehensive Commentary on the Recycling Management Regulation, Korea Ministry of Environment, Korea

17

KMOE, 2019, Recycling Environmental Assessment Manual, Korea Ministry of Environment, Korea

18

KMOE, 2020a, Follow-up Management Guide of Media-contact Recycling, Korea Ministry of Environment, Korea.

19

KMOE, 2020b, Products Subject to Environmental Labeling and Certification Standards, Eco Label 744: Recycled Slag Products, Korea.

20

KMOE, 2023a, Wastes Control Act, Korea Ministry of Environment, Korea.

21

KMOE, 2023b, Act on Promotion of Recycling of Construction Waste, Korea Ministry of Environment, Korea.

22

KISA, 2023, Recycling Perfomance in 2022 and Recycling Plan in 2023, Korea Iron and Steel Association, Korea.

23

Kim, J.M., Yoo, J.H., and Kwak, E.G., 2010, Properties of steel slag as construction material, Magazine of RCR, 5(1), 33-40.

24

Król, A., Mizerna, K., and Bozym, M., 2020, As assessment of pH-dependent release and mobility of heavy metals from metallurgical slag, J. Hazard. Mater., 384, 121502.

25

Lee, M.Y., Kang, J.H., Hwang, D.G., Yoon, Y.S., Yoo, M.S., and Jeon, T.W., 2021, Environmental assessment of Recycling (EAor) for safe recycling of steelmaking slag in the republic of Korea: Applications, leaching test, and toxicity, Sustainability, 13(16), 8805.

26

Min, D.G. and Lee, S.H., 2015, Review of environmental properties of steel slag and research on ways to improve recycling system, Research Report, Korea Iron and Steel Association, Korea

27

MOLIT, 2021, Recycled Aggregate Quality Standards, Ministry of Land, Infrastructure and Transport, Korea.

28

Na, B.B., 2021, Environmental group "Stop importing steelmaking slag with hazardous substances detected into Saemangeum", Yonhap News Agency, https://www.yna.co.kr/view/AKR20210729123051055 [accessed 03.01.22]

29

NIER, 2017, Standard methods for the examination of Waste, ES 06151.1, National Institute of Environmental Research, Korea.

30

NARS, 2021, Recycling environmental envaluation operation status and improvement tasks, National Assembly Research Service, Korea.

31

Park, S.H., 2022, Saemangeum solar power pollution leachate, Ministry of Environment crushes without investigation for a half year, The Chosun Ilbo, https://www.chosun.com/national/transport-environment/2022/05/31/T55266WZPNFHLAK5GYOZU2S4WY/ [accessed 30.06.22]

32

SHA, 2015, Research report: Getotechnical and Environmental Impacts of Steel Slag Use in Highway Construction, State Highway Administration, MD, USA.

33

ISIJ, 2019, Guidelines for Steel Slag Product Management, The Iron and Steel Institute of Japan, Japan.

34

US EPA, 2022, Code of Federal Regulation, US Environmental Protection Agency, https://www.ecfr.gov/current/title-40/chapter-I/subchapter-I/part-268?toc= [accessed 23.10.22]

35

WSA, 2023, World Steel in Figures, World Steel Association, Belgium.

36

WSDOT, 2015, Use of Steel Slag Aggregate in Pavements, Washington State Department of Transportation, WA, USA.

Information
  • Publisher :The Korean Society of Soil and Groundwater Environment
  • Publisher(Ko) :한국지하수토양환경학회
  • Journal Title :Journal of Soil and Groundwater Environment
  • Journal Title(Ko) :지하수토양환경
  • Volume : 29
  • No :1
  • Pages :39-50
  • Received Date : 2024-01-10
  • Revised Date : 2024-01-26
  • Accepted Date : 2024-02-02
  • DOI :https://doi.org/10.7857/JSGE.2024.29.1.039
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