Study of Raw Mix and Clinker Using Slags as Raw Materials

Young-Jun Lee; Do-young Kwon; Mend Bilguun; Yong-Sik Chu

doi:10.7844/kirr.2025.34.1.3

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2025 Vol.34, Issue 1 Next Page

Research Paper

Study of Raw Mix and Clinker Using Slags as Raw Materials 혼합 슬래그를 사용한 시멘트 혼합원료 및 클링커의 특성 연구

28 February 2025. pp. 3-13

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Abstract

The greenhouse gas (GHGs) emissions of the cement industry are increasing year on year, and 60–65% of GHGs are generated from limestone, the main raw material for cement clinker. To reduce GHGs, limestone can be replaced with noncarbonate CaO-containing slag. In this study, two types of mixed slag were used to replace CaCO₃. The majority of the slag was CaO, as shown by the low amount of CO₂ produced (> 1%). In addition, the Kambara Reactor slag (KR slag) contained some Ca(OH)₂. When designing a raw mix using mixed slag, the CaCO₃ replacement ratio was set to 3–12%, and the clinker modulus was fixed at Lime Saturation Factor (LSF) 92.0, Silica Modulus (SM) 2.50, and Iron Modulus (IM) 1.60. When using 12% CaCO₃, the mixed slag (P) usage was 23% and that of the mixed slag (H) was 20%. As the CaCO₃ replacement ratio increased, the clinker yield increased, and the clinker mineral and free CaO contents decreased.

Keywords

Slag

Limestone

Clinker

Raw mix

Mineral

세계 시멘트 산업의 온실가스 배출량은 매년 증가하고 있으며, 이중 시멘트 클링커 주원료로 사용되는 석회석으로부터 60~65 %가 배출되고 있다. 이를 해결하기 위해 비탄산 CaO 함유 슬래그를 사용하여 석회석을 대체하는 방안이 검토되고 있다. 본 연구에서는 CaCO₃ 대체를 위해 2종류의 혼합 슬래그를 사용하였다. 모든 슬래그는 CO₂ 양이 1 %를 상회하지 않아 대부분 비탄산 CaO로 구성되어 있다는 것을 확인할 수 있었으며, KR 슬래그는 Ca(OH)₂가 일부 존재한다고 판단되었다. 혼합 슬래그 사용 혼합원료 배합설계 시 CaCO₃ 대체율은 3~12 %로 제어하였으며, 클링커 모듈러스는 LSF 92.0, SM 2.50, IM 1.60으로 고정하였다. CaCO₃ 12 % 대체 시 혼합 슬래그(P) 사용량은 23.00 % 및 혼합 슬래그(H) 사용량은 20.16 %이었다. CaCO₃ 대체율 증가에 따라 클링커 수율은 증가하였으며, 클링커 광물 생성량은 감소하였으며, F-CaO 함량도 감소하였다. 하지만 alite 및 belite 크기가 조금씩 커졌으며, 특히 CaCO₃ 대체율 9 % 이상에서는 20 μm를 상회하는 수준으로 증가하였다.

키워드

슬래그

석회석

클링커

혼합원료

광물

References

Supriya, R. Chaudhury, U. Sharma, et al., 2003 : Low-CO2 emission strategies to achieve net zero target in cement sector, J. Cleaner Production, 417, pp.1-19.

10.1016/j.jclepro.2023.137466

National Climate Technology Center, 2021 : Decarbonizing steel, Technologies and Costs, Climate Technology Brief, KIER, 44, pp.2-5.

S. H. Park, J. H. Jung, S. T. Lee, 2020 : Performance of Concrete Pavement Incorporating Air- and Water-Cooled Slag, KSCE 2020 Convention, pp.1,045-1,046.

Jawad Ahmad, Karolos J. Kontoleon, Ali Majdi, et al., 2022 : A Comprehensive Review on the Ground Granulated Blast Furnace Slag (GGBS) in Concrete Production, Sustainability, 14(14) 8783, pp.1-27.

10.3390/su14148783

P. E. Tsakiridis, G. D. Papadimitriou, S. Tsivilis, et al., 2008 : Utilization of steel slag for Portland cement clinker production, J. Hazard. Mater, 152(2), pp.805-811.

10.1016/j.jhazmat.2007.07.09317869414

R. I. Iacobescu, D. Koumpouri, Y. Pontikes, et al., 2011 : Valorisation of electric arc furnace steel slag as raw material for low energy belite cements, J. Hazard. Mater., 196, pp.287-294.

10.1016/j.jhazmat.2011.09.02421944704

Tianming Gao, Tao Dai, Lei Shen, et al., 2021 : Benefits of using steel slag in cement clinker production for environmental conservation and economic revenue generation, J. Cleaner Production, pp.282.

10.1016/j.jclepro.2020.124538

Peter C. Hewlett, Martin Liska, 2019 : Lea's chemistry of cement and concrete, pp.100-106, 5th Edition, Butterworth-Heinemann, Oxford

Xiaoli Huang, Junfei Zhang, Lei Zhang, 2024 : Accelerated carbonation of steel slag: A review of methods, mechanisms and influencing factors, Construction and Building Materials, 411, pp.1-16.

10.1016/j.conbuildmat.2023.134603

Hao Zhou, Xia Yao, Huihua Min, et al., 2021 : Research on structure modulation of alite and its effect on the mechanical properties of cement clinker, Construction and Building Materials, 303, pp.1-13.

10.1016/j.conbuildmat.2021.124511

Donald H. Campbell, 1999 : Microscopical examination and interpretation of portland cement clinker, pp.46-49, 2nd Edition, Portland Cement Assn, Washington, D.C..

Information

Publisher :The Korean Institute of Resources Recycling
Publisher(Ko) :한국자원리싸이클링학회
Journal Title :Resources Recycling
Journal Title(Ko) :자원리싸이클링
Volume : 34
No :1
Pages :3-13
Received Date : 2024-10-07
Revised Date : 2024-12-16; 2024-12-17
Accepted Date : 2024-12-17
DOI :https://doi.org/10.7844/kirr.2025.34.1.3

Resources Recycling ISSN:2765-3439(Print) 2765-3447(Online) 자원리싸이클링

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