Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Analysis of limestone micromechanical properties by optical microscopy
During a heterogeneous closed circuit comminution process, the wear rates can reach magnitudes which severely affect the mill performance. A cement raw mix mostly consists of a hard mineral such as quartz and soft carbonates, mostly calcite, the latter constituting approximately 75 %. Due to the closed circuit comminution process, the abrasive accumulates on the grinding table increasing the abrasion of the wear parts. The grindability of a limestone can be explained as being the amount of fines produced at a certain sieve size from one single or a series of comminution events. Previous studies showed that the grindability of limestones determines the wear rate. Thus, the study is targeted at quantifying the limestone texture with the aim of predicting the grindability. Four dense Scandinavian limestones were analyzed to determine their mechanical properties. The generation of dust and fines during a closed circuit vertical roller mill comminution process was correlated with the calcite crystal size distributions of each limestone. Thin sections were analyzed and by means of stereology the calcite crystal size distributions for each limestone was measured. The dust generation of limestones is governed by a surface abrasive mechanism and the production of fines is governed by the mechanical strength of limestones. The overall limestone degradation mechanism is predominantly controlled by the calcite cleavage planes which reduce the power consumption during the comminution process.
Analysis of limestone micromechanical properties by optical microscopy
During a heterogeneous closed circuit comminution process, the wear rates can reach magnitudes which severely affect the mill performance. A cement raw mix mostly consists of a hard mineral such as quartz and soft carbonates, mostly calcite, the latter constituting approximately 75 %. Due to the closed circuit comminution process, the abrasive accumulates on the grinding table increasing the abrasion of the wear parts. The grindability of a limestone can be explained as being the amount of fines produced at a certain sieve size from one single or a series of comminution events. Previous studies showed that the grindability of limestones determines the wear rate. Thus, the study is targeted at quantifying the limestone texture with the aim of predicting the grindability. Four dense Scandinavian limestones were analyzed to determine their mechanical properties. The generation of dust and fines during a closed circuit vertical roller mill comminution process was correlated with the calcite crystal size distributions of each limestone. Thin sections were analyzed and by means of stereology the calcite crystal size distributions for each limestone was measured. The dust generation of limestones is governed by a surface abrasive mechanism and the production of fines is governed by the mechanical strength of limestones. The overall limestone degradation mechanism is predominantly controlled by the calcite cleavage planes which reduce the power consumption during the comminution process.
Analysis of limestone micromechanical properties by optical microscopy
Analyse der mikromechanischen Eigenschaften von Kalkstein durch optische Mikroskopie
Jensen, L.R.D. (Autor:in) / Friis, H. (Autor:in) / Fundal, E. (Autor:in) / Möller, Per (Autor:in) / Jespersen, M. (Autor:in)
Engineering Geology ; 110 ; 43-50
2010
8 Seiten, 10 Bilder, 3 Tabellen, 23 Quellen
Aufsatz (Zeitschrift)
Englisch
Zement , Zementherstellung , Mahlen , Mahlgut , Abrieb , Calcit , Quarz , Härte , Gefüge (Werkstoff) , Mikroskopie , Korngröße , Korngrößenmessung , Regressionsrechnung , Regressionsanalyse , Mikromechanik , Kalkstein
Analysis of limestone micromechanical properties by optical microscopy
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