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https://nap.nationalacademies.org/catalog/27432/critical-issues-in-transportation-for-2024-and-beyond

REDUCTION OF BURNING TEMPERATURE OF CEMENT CLINKER BY ADJUSTING OF MINERAL COMPOSITION

鉱物組成の調整によるクリンカー焼成温度低減に関する検討

Cement industry is one of the energy-intensive industries. Though Japanese cement industry has achieved top-class energy efficiency in the world, the development of the further energy saving technology is needed from the view point of global environmental protection such as the reduction of carbon dioxide and fossil fuel consumption. In this study, the authors investigated the potential of the burning temperature reduction by adjusting major mineral composition of clinker determined by Bogue equation. First, the authors prepared nineteen kinds of clinkers by changing major mineral composition of clinker. As a result of free lime and porosity, it became clear that C₄AFcontributed the most to sintering clinker among the four major elements. In summary, the contribution order to clinker burnability is that C₄AF＞C₃A＞C₂S＞C₃S. It seemed that compressive strength decreased in case C₄AF was increased, but the authors found that the decrease of strength development was minimized by reducing C₂S instead of increasing C₄AF. On the basis of these results, the authors investigated the clinker burnability and cement strength in detail by using industrial raw materials, in case of increasing C₄AF and decrease C₂S instead. As a result of free limes and porosity, it became clear that by increasing C₄AF 7％, the sintering degree of clinker was equal even if it was burned at 1,350 degrees, which was 100 degrees lower than the actual case. As a result of compressive strength, it also became clear that by increasing C₄AF 7～9％, the strength development of cement was kept even if the clinker was burned at 1,350°. From the above-mentioned result, the authors found the possibility that the burning temperature of clinker could be lowered 100° by adjusting major mineral composition.セメント産業はエネルギー多消費型産業であり、環境面等の観点から省エネルギー技術の開発が求められている。本研究では、鉱物組成の調整によるクリンカーの焼成温度低減を目的として各鉱物の易焼成および強度発現性を検討した。その結果、各鉱物が易焼成に与える影響はC₄AF＞C₃A＞C₂S＞C₃Sであることを確認した。また、C₃Sを固定し、C₄AFを増加させ、その代わりにC₂Sを減らすことで、1,350℃焼成した場合においても易焼成および強度発現性を維持できることがわかった。この結果から鉱物組成の調整において現行よりもクリンカー焼成温度を100℃程度低減できる可能性が確認された。

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  • Japanese

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  • Accession Number: 01522851
  • Record Type: Publication
  • Source Agency: Japan Science and Technology Agency (JST)
  • Files: TRIS, JSTAGE
  • Created Date: Apr 24 2014 11:44AM