Search | Korea Science

Yoo, Dong-Woo;Im, Young-Jin;Choi, Sang-Min;Lee, Chang-Hyun
- Journal of the Korean Recycled Construction Resources Institute
- /
- v.9 no.4
- /
- pp.553-560
- /
- 2021
In this study, cement clinker using a pure sample and clinker using 7% coal ash were sintered at a temperature of 1050~1500℃. Changes in the content of cement minerals and changes in microstructure by sintering temperature were reviewed. The application of coal ash as a raw material for cement clinker was applicable as a source of Al₂O₃ and SiO₂. At a sintering temperature of 1350℃ or higher, the cement clinker applied with coal ash showed the same level of mineral content as compared to the cement clinker applied with pure raw material. The microstructure also showed a similar state, confirming that coal ash can be used as a raw material for cement. In XRD-Reitveld analysis, a maximum amount of Belite was produced at 1250℃. The conversion from Belite to Alite was observed from 1350℃. From 1350℃, the interstitial phase and the mineral phase presumed to be alite were distinguished. It was clearly distinguished from 1400℃. As the sintering temperature increased, the shape and boundary of the crystal phase became clear, and the size of the crystal phase was also increased.
https://doi.org/10.14190/JRCR.2021.9.4.553 인용 PDF KSCI

Lee, Jung-Hui;Park, Nam-Kyu;Jung, Yon-Jo;Chu, Yong-Sik;Song, Hun
- Proceedings of the Korea Concrete Institute Conference
- /
- 2008.11a
- /
- pp.549-552
- /
- 2008
The cement is accomplished with CaO, SiO2, Al2O3 and Fe2O3, etc. After pulverizing materials of the limestone, the sand and the clay(shale), iron ore, the cement becomes clinker materials sintering from the rotary kiln of oxidizing atmosphere. The part in the materials of the clinker is substituted with slag, sludge etc. and it is used. because The chromium which is to be included in the clinker materials, in sintering process hexavalent chromium is converted with the chrome. Consequently it changed the type and a content of clinker materials and test hexavalent chromium of the clinkers which is manufactured.
PDF