Evaluation of size reduction process for rock aggregates in cone crusher
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ORIGINAL PAPER
Evaluation of size reduction process for rock aggregates in cone crusher Ekin Köken 1 Received: 26 February 2019 / Accepted: 20 May 2020 # Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract The size reduction process of rocks in cone crushers is one of the most important issues, particularly for the secondary and tertiary stages of crushing operations. In this study, 17 different rock types were considered for the evaluation of their size reduction variations that occurred in a laboratory-scale cone crusher. Based on several mineralogical, physico-mechanical, and aggregate properties determined for each rock type, the crushability tests were performed. Before and after the crushability tests, particle size distribution (PSD) of the uncrushed (feed) and crushed (product) materials were determined by sieve analyses. On the basis of these PSDs, the degree of rock crushability (DRC) was attempted to quantify by simple approaches (i.e., size reduction ratio, SRR, and the theoretical square mesh aperture size that corresponds to the 10% of the cumulative undersize in the product, P10 (mm)). The crushability test results demonstrated that the DRC in cone crusher could be quantified by focusing on the variations in the SRR and P10. The SRR and P10 are associated with three important rock properties, Shore hardness (SH), Los Angeles abrasion loss (LAA, %), and Brazilian tensile strength (BTS, MPa). The textural and mineralogical features of rocks also have substantial impacts on the DRC for several rock types. It was concluded that the combination of the SRR and P10 could be considered together for the evaluation of DRC in cone crushers. Moreover, further research potentials on the DRC were also discussed in this study. Keywords Crushed rock . Aggregate . Size reduction . Cone crusher . Rock crushability
Introduction The size reduction process of rocks plays a vital role in the quantity of desired product size with optimum energy consumption. The degree of rock crushability (DRC) has recently become a fascinated research area in terms of economic efficiency, sustainability, and the productivity of rock quarrying. In the mining industry, the size reduction processes of rocks are mainly accomplished by gyratory, impactors (i.e., horizontal and vertical shaft impactors), jaw, and cone crushers in the primary, secondary, and tertiary crushing operations. Some of these crushers have been investigated to clarify several issues such as the crushing mechanism, energy consumption, reducing fines during the crushing action, and wear rate estimations
* Ekin Köken [email protected] 1
Department of Materials Science and Nanotechnology Engineering, Abdullah Gül University, 38100 Kayseri, Turkey
(Guimaraes et al. 2007; Mitchell et al. 2008; Korman et al. 2015, and Terva et al. 2018). In a jaw crusher, for instance, the crushing action occurs as a result of compression, indirect tensile, and impact forces. Rock aggregates are broken down under compression forces induced by the throw of moving jaw.
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