Characteristics of Cement Raw Mix and Clinker used Non-Carbonated Materials

Young Jun Lee; Woo Sung Yum; Sung Kwan Seo; Yong Sik Chu

doi:10.7844/kirr.2023.32.5.35

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2023 Vol.32, Issue 5 Preview Page Next Page

Research Paper

Characteristics of Cement Raw Mix and Clinker used Non-Carbonated Materials 비탄산염 원료를 사용한 시멘트 혼합원료 및 클링커 특성

31 October 2023. pp. 35-43

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Abstract

The cement industry emits a large amount of GHGs (greenhouse gases) and about 65% of GHGs is originated from limestone. So non-carbonated CaO materials were examined to replace limestone in this study. It was attempt to replace limestone by used blast furnace slag, converter slag, and KR slag with high CaO content. For manufacture clinker, LSF, SM, and IM were controlled at 92, 2.5, and 1.6, respectively, and the CaCO₃ replacement rate was fixed at 3%, 6%, 9%, and 12%. As using blast furnace slag, the CaCO₃ replacement rate was possible up to 12%, but for converter slag and KR slag, up to 3% and 9% were possible. The burnability of clinker was better when blast furnace slag and KR slag were used. The XRD peak intensity of clinker used blast furnace slag gradually decreased as the amount of slag used increased, but when KR slag was used, the XRD peak intensity actually increased. It was presumed to be because KR slag has a high CaO content and already contains C2S, making it easier to produce clinker minerals.

Keywords

Non-Carbonated material

Slag

CaCO₃ replacement

Burnability

Clinker

시멘트산업은 다량의 온실가스를 배출하고 있으며, 이중 석회석 기인 온실가스가 약 65%를 차지하고 있다. 따라서 본 연구에서는 석회석 대체를 위해 비탄산 CaO 원료를 검토하였다. 특히 제철·제강 부산물 중 CaO 함량이 많은 고로 괴재 슬래그, 전로 슬래그 및 KR 슬래그를 사용하였다. 클링커 제조를 위해 LSF, SM, IM은 각각 92, 2.5, 1.6으로 제어하였으며, CaCO₃ 대체율은 3%, 6%, 9% 및 12%로 고정하였다. 혼합원료 배합설계 시 고로 괴재 슬래그 사용 조건에서는 CaCO₃ 대체율이 12%까지 가능하였으나, 전로 슬래그는 3%, KR 슬래그는 9%까지 가능하였다. 클링커의 소성성은 고로 괴재 슬래그 및 KR 슬래그 사용 시 좀 더 양호하였다. 고로 괴재 슬래그 사용 클링커의 XRD 피크 강도는 슬래그 사용량 증가에 따라 점차 감소하였으나, KR 슬래그 사용 시에는 XRD 피크 강도가 오히려 증가하였다. 이는 KR 슬래그의 CaO가 비탄산 성분으로 고함량이며, 이미 C2S를 함유하여 클링커 광물 생성이 좀 더 용이해지기 때문으로 사료되었다.

키워드

비탄산염 원료

슬래그

CaCO₃ 대체율

소성성

클링커

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Information

Publisher :The Korean Institute of Resources Recycling
Publisher(Ko) :한국자원리싸이클링학회
Journal Title :Resources Recycling
Journal Title(Ko) :자원리싸이클링
Volume : 32
No :5
Pages :35-43
Received Date : 2023-09-18
Revised Date : 2023-10-12
Accepted Date : 2023-10-16
DOI :https://doi.org/10.7844/kirr.2023.32.5.35

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

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