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Analysis of limestone micromechanical properties by optical microscopy
Authors:Lucas RD Jensen  Henrik Friis  Erling Fundal  Per Møller  Mads Jespersen
Institution:1. FLSmidth A/S, Vigerslev Allé 77, 2500 Valby, Denmark;2. Fundal Consult, Østergade 4, 4140 Borup, Denmark;3. Technical University of Denmark, Kemitorvet, Bygning 204, 2800 Kgs Lyngby, Denmark;4. Århus University, Department of Earth Sciences, Høegh-Guldbergs Gade 2, 8000 Århus C, Denmark;1. College of Optical Sciences, Arizona Center for Mathematical Sciences (ACMS), University of Arizona, Tucson, AZ 85721, United States;2. Department of Mathematics and Statistics, University of New Mexico, 1 University of New Mexico, Albuquerque, NM 87131, United States;3. Department of Mathematics, Southern Methodist University, PO Box 750156, Dallas, TX 75275, United States;1. Department of Physics, University of Siegen, Walter-Flex-Str. 3, D57072 Siegen, Germany;2. Institute of Materials Engineering, Department of Mechanical Engineering, University of Siegen, Paul-Bonatz-Str. 9-11, D57076 Siegen, Germany;3. Helmholtz-Zentrum Geesthacht Centre for Materials and Coastal Research, Max-Planck-Str. 1, D21502 Geesthach, Germany;1. LML, UMR CNRS 8107, University of Lille, 59655 Villeneuve d’Ascq, France;2. LGC, University of Reims, 51687 Reims, France;1. Disaster Research Nexus, School of Civil Engineering, Universiti Sains Malaysia, Engineering Campus, 14300 Nibong Tebal, Seberang Perai Selatan, Penang, Malaysia;2. School of Civil Engineering, Universiti Sains Malaysia, Engineering Campus, 14300 Nibong Tebal, Seberang Perai Selatan, Penang, Malaysia;3. Department of Civil Engineering, Faculty of Engineering, University of Malaya, 50603 Kuala Lumpur, Malaysia;1. LNEG - Laboratório Nacional de Energia e Geologia, S. Mamede de Infesta, 4466-91, Portugal;2. FEUP - Mining Department, Faculty of Engineering, University of Porto, Rua Dr. Roberto Frias, 4200-465 Porto, Portugal
Abstract:Four dense Scandinavian limestones were analyzed to determine their mechanical properties. The generation of dust (? 10 μm) and fines (? 90 μm) 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 (R2 = 0.99) and the production of fines is governed by the mechanical strength of limestones (R2 = 0.99). The overall limestone degradation mechanism is predominantly controlled by the calcite cleavage planes which reduce the power consumption during the comminution process. This study is the first step in determining the influence of limestone texture on the wear rates in heterogenous raw mixes used in closed circuit comminution equipment.
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