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Dong-Woo Yoo;Young-Jin Im;Sang-Min Choi;Sung-Ku Kwon;Seok-Je Lee
- Journal of the Korean Recycled Construction Resources Institute
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- v.11 no.1
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- pp.16-24
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- 2023
Coal ash generated from thermal power plants using briquettes contains Si, Al, and Fe components. These components are the main components required for the manufacture of cement clinker. In particular, Al and Fe components form the interstitial phase of cement clinker and have an important effect on the sintering of cement clinker. In this study, a large amount of coal ash was applied as a raw material for cement clinker by content, and the mineral formation process of cement clinker to which coal ash was applied was confirmed by sintering temperature. It was confirmed that the intermediate phase was generated in the sintering temperature range of 1050 ~ 1150 ℃ in the cement clinker to which a large amount of coal ash was applied. As the content of coal ash increased, the production amount of the intermediate phase increased. The phase produced by the addition of coal ash is expected to be converted to calcium silicate phase and interstitial phase and disappear above 1350 ℃. The cement clinker applied with a large amount of coal ash at 1450 ℃ formed well-developed minerals equivalent to the standard cement clinker.
https://doi.org/10.14190/JRCR.2023.11.1.16 인용 PDF

Dong-Woo Yoo;Sung-Ku Kwon;Min-Seok Oh;Seok-Je Lee
- Journal of the Korean Recycled Construction Resources Institute
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- v.11 no.4
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- pp.364-372
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- 2023
By applying coarse-grained limestone and unprocessed coal ash as sintering raw materials for cement clinker, the microstructure and distribution of chemical components of cement clinker were compared and examined. Samples using coarse limestone as a raw material for cement clinker showed a decrease in sinterability compared to samples using reagent-grade raw materials. Samples using coal ash showed a tendency for some increase in sinterability. In samples using coarse limestone and coal ash, the formation of Belite was high at 1350 ℃. The conversion rate from Belite to Alite was high in the range of 1350~1450 ℃. Samples using coal ash showed stable formation of interstitial phase in the range of 1350 to 1450 ℃. The microstructure and chemical composition distribution of cement clinker sintered at 1350~1450 ℃ showed that all samples showed a form and composition distribution in which the calcium silicate phase and interstitial phase were clearly distinguished.
https://doi.org/10.14190/JRCR.2023.11.4.364 인용 PDF