Abstract
Four major clinker minerals, alite, belite, tricalcium aluminate and tetracalcium aluminate ferrite are crucial for cement properties. This work deals with alite as the most important clinker minerals. Alite is affected by the milling process technology more than other clinker minerals. It contains micro-cracks, which are formed during fast cooling, and is therefore less resistant to grinding than other clinker minerals. The paper deals with the influence of length and the technology of the milling process in 3 types of laboratory mills on the particle size and distribution, agglomeration and the change of the grain shape of the synthetically prepared triclinic alite.
Highlights
The most important part of the Portland cement is clinker, which is produced by burning raw meal in a cement kiln at 1450°C
The most important technical phases occurring in the clinker are alite (C3S), belite (C2S), tricalcium aluminate (C3A) and brownmillerite (C4AF) and their polymorphs [1,2,3]
Intensive milling in the vibratory and planetary mills results in the formation of large quantities of fine particles
Summary
The most important part of the Portland cement is clinker, which is produced by burning raw meal in a cement kiln at 1450°C. The final properties of the clinker and cement do not directly determine the chemical composition but the mineralogical composition. The mineral composition of the clinker is the result of used raw materials and production technology. More than 25 minerals are known in Portland clinker. It is necessary to distinguish pure minerals from technical ones that are usually altered in the clinker by the presence of other components or impurities in the solid solution. The most important technical phases occurring in the clinker are alite (C3S), belite (C2S), tricalcium aluminate (C3A) and brownmillerite (C4AF) (according to Törnebohm) and their polymorphs [1,2,3]
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