Journal of Korean Society of Environmental Engineers (대한환경공학회지)

Korean Society of Environmental Engineers (대한환경공학회)
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Up-cycling of Air-cooled Ladle Furnace Slag : Environmental Risk Assessment and Mortar Compressive Strength Assesment of Binary and Ternary Blended Cement Using Air-cooled Ladle Furnace Slag

전기로 환원슬래그 Up-cycling : 환경위해성 평가 및 환원슬래그를 혼합하여 제조한 2성분계 및 3성분계 혼합시멘트 모르타르 압축강도 평가

  • Received : 2014.09.23
  • Accepted : 2015.03.30
  • Published : 2015.03.31
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Abstract

This study investigated the environmental risk for up-cycling of air-cooled ladle furnace slag (LFS) and evaluated the mortar compressive strength of binary and ternary blended cements using LFS of 3, 5, 10 wt%. Based on the Soil Environment Conservation Act standard, there was no environmental risk of the up-cycling of LFS. Results of mortar compressive strength assesment showed that the compressive strength of two blended cements using LFS of lower than 5 wt% was about 1.1 times superior to that of un-substituted cement (ordinary portland cement, OPC); however the compressive strength of those with LFS of 10 wt% decreased with 10% compared with that of OPC.

친환경 토목/건축소재가 각광받는 시대가 도래되면서 시멘트 산업에서의 철강슬래그 등의 산업부산물 up-cycling 사례가 계속 증가되는 추세이다. 본 연구에서는 국내 외적으로 재활용 사례가 거의 없는 서냉 전기로 환원슬래그의 up-cycling 용도 개발을 위한 목적으로 토양환경보전법 시행규칙 별표 3의 '토양오염우려기준'에 근거하여 환원슬래그에 대한 기초적인 환경위해성 평가를 수행하여, 환경적 측면에서의 사용 안전성을 검증하였다. 아울러 주요 온실가스 배출원인 시멘트 생산량을 줄이기 위한 방안으로, 보통 포틀랜드 시멘트 및 고로수쇄슬래그 시멘트에 혼화재로서 환원슬래그를 일부 치환한, 2성분계 및 3성분계 혼합시멘트를 제조하고, 각 혼합시멘트 모르타르의 압축강도를 평가하였다. 압축강도 평가 결과, 환원슬래그를 최대 5 wt%까지 치환한 두 종류의 혼합시멘트 모르타르들의 재령일 28일에서의 압축강도는 무치환시멘트 경우와 유사하거나 약 1.1배 우수함을 확인하였다.

Keywords

References

  1. Kim, Y. L., Hong, Y. H., Son, J. I., Oh, G. J. and Kim, K. H., "Analysis on the consumption distribution and production-effect of energy in domestic MBT facility," J. Korea Soc. Waste Manage., 31(3), 290-299(2014). https://doi.org/10.9786/kswm.2014.31.3.290
  2. Lim, J. H., "2011 Steel slag recycling records and 2012 Steel slag recycling plans," Korea Iron & Assoc. KOSA Bullet., 4, 38-39(2012).
  3. Ministry of Environment, Ministry of Trade, Industry and Energy, "Steel slag and coal ash disposal business operator recycling guidelines," Ministry of Environment Notification No. 2012-209, Ministry of Trade, Industry and Energy Notification No. pp. 2012-258(2012).
  4. Lee, S.-H., Hwang. H.-J. and Kwon, S.-K., "Properties of blast furnace slag cement modified with electric arc furnace slag," J. Korean Ceramic Soc., 43(7), 408-414(2006). https://doi.org/10.4191/KCERS.2006.43.7.408
  5. Lee, D. U., Kim, H. S., Kim, J. M., Choi, S. M., Cho, B. G., Hu, T., "A study on eco-efficiency analysis of ultra rapid harding cement production by recycling of ladle furnace slag," J. Korea Soc. Waste Manage., 30(6), 529-536(2013). https://doi.org/10.9786/kswm.2013.30.6.529
  6. Kim, H. S., An, Y.-J., Han, I.-K. and Bae, I. K., "Electric arc furnace reduction slag physical characteristics and recycling of cement," Proc. Korean Inst. Metals Mater., Daejeon, Korea, October, 28, 65-72(2011).
  7. Serjun, V. Z., Mirtic, B. and Mladenovic, A., "Evaluation of ladle slag as a potential material for building and civil engineering," Mater. Technol., 47(5), 543-550(2013).
  8. Manso, J. M., Losanez, M., Polanco, J. A. and Gonzalez, J., "Ladle furnace slag in construction," J. Mater. Civil Eng., 17, 513-518(2005). https://doi.org/10.1061/(ASCE)0899-1561(2005)17:5(513)
  9. Shi, C., "Characteristics and cementitious properties of ladle slag fines from steel production," Cement and Concrete Res., 32, 459-462(2002). https://doi.org/10.1016/S0008-8846(01)00707-4
  10. Ministry of Environment, "Soil Environment Conservation Act, Enforcement Regulation 3, Soil pollution anxiety criterion (Revision 2011. 10. 6)."
  11. An, Y.-J., Han, I.-K., Choi, J.-S., Bae, K.-H. and Kim, H.-S. "Hydration property of electric arc furnace reducing slag," J. Korean Inst. Resour. Recycl., 19(6), 93-101(2010).
  12. Park, J.-T. and Oh, H., "Experimental study on the material characteristics of slag cement with various phosphogypsum materials," J. Korea Concrete Inst., 21(6), 729-735(2009). https://doi.org/10.4334/JKCI.2009.21.6.729
  13. Kim, J. M., Choi, S. M., Lee, H. N., Li, M, Cho, H. S. and Moon, W. S., "Initial hydration properties of CA based ladle furnace slag with low silica oxide content in Iron recycling process," Proc. Korea Concrete Inst. Muchangpo, Korea, October, 15, 26(2), 317-318(2014).
  14. Nam, S. N., Lee, J. H., Lim, T. H., Jun, T. W., Lee, D. J., Kim, N., Hwang, D. K., Hu, J. H., Lee, Y. J. and Oh, K. J., "Distributional Understanding of Toxic Heavy Metals in Korean Ordinary Portland Cements Using Statistical Approaches," J. Korea Soc. Waste Manage., 26(7), 644-651(2009).
  15. Song, J.-S., Lee, B.-S. and Kim, J. H., "Comparative Analysis of Cytotoxicity of Fluoride Compounds on Oral Cancer and Osteosarcoma Cells," Korean Soc. Environ. Health Toxicol., 14(3), 113-120(1999).
  16. Ko, I.-Y., Jin, B.-S. and Kim, Y.-W., "A Study on the Reuse of Modified and Quenched Converter Slag as Cement Additives," J. Korean Inst. Resour. Recycl., 12(5), 23-28(2003).
  17. Chu, Y. S., Park, S. H., Seo, S. K. and Park, J. W., "Properties of shrinkage reducing agent and mortar with C12A7 based slag and petroleum cokes ash," J. Korea Ceramic Soc., 50(5), 319-325(2013). https://doi.org/10.4191/kcers.2013.50.5.319
  18. SungShin Cement, "Design and construction of mass concrete using low heat blended cement," p. 16(2014).