The effect of the particle size differentiation of lignite fly ash on cement industry applications (EN)

Itskos, S (EN)

Koukouzas, N (EN)

Itskos, GS (EN)

The chemical and mineralogical composition of lignite fly ash (FA) varies as a function of the prevalent conditions in both the processes of power production and lignite mining. The differentiation of the qualitative and quantitative composition of the Greek calcareous lignite fly ash, as a function of its particle size distribution, is verified in this paper. According to the results of the conducted research, a fine-grained fraction of considerable amount presents properties that obstruct the sustainable exploitation of lignite fly ash in cement industry applications. On the other hand, the same grain fraction (because of its hydraulic properties) can be utilized in other sort of applications, based on different criteria. The coarse-grained fraction (which reflects a low proportion to the total fly ash output) presents the same undesired characteristics as well. However, the intermediate grain fraction [75-150μm] presents the highly desired properties in the field of the utilization of fly ash as pozzolanic additive in the production process of cement. In addition, the mechanism of the formation of the intermediate grain fraction strongly prevents the factors that cause the variation of its quality. It is therefore the optimum part of the whole amount of lignite fly ash, to be utilized as additive in cement manufacturing. The outcomes of this paper will hopefully contribute to the crucial goal of the expansion of the utilization of lignite fly ash in Greek cement industry by proposing a more effective way of using this material, basically by taking advantage of its fundamental chemical and mineralogical properties. (EN)

conferenceItem (EN)

Finegrained fractions (EN)

Fly ash cements (EN)

Size distribution (EN)

Grain fraction (EN)

Power production (EN)

Coal ash (EN)

Pozzolanic additives (EN)

Mineralogical properties (EN)

Cement manufacture (EN)

Cement manufacturing (EN)

Cement additives (EN)

Fly ash (EN)

Calcareous fly ash (EN)

Particle size distribution (EN)

Lignite (EN)

Mineralogical compositions (EN)

Lignite mining (EN)

Coarse-grained (EN)

Sustainable utilization (EN)

Lignite fly ash (EN)

Hydraulic properties (EN)

Production process (EN)

Sustainable exploitation (EN)

Εθνικό Μετσόβιο Πολυτεχνείο

Ψηφιακό Αποθετήριο της Κεντρικής Βιβλιοθήκης του ΕΜΠ | Dspace@NTUA

Κεντρική Βιβλιοθήκη Ε.Μ.Π.

Ιδρυματικό Αποθετήριο

Δημοσιεύσεις μελών Δ.Ε.Π. σε συνέδρια

3rd World of Coal Ash, WOCA Conference - Proceedings (EN)

2009 (EN)

http://hdl.handle.net/123456789/35864