Original scientific paper

https://doi.org/10.17794/rgn.2019.4.2

VOLUME BASED CLOSED-CYCLE HARDGROVE GRINDABILITY METHOD

Gábor Mucsi ; Institute of Raw Material Preparation and Environmental Processing, University of Miskolc, 3515 Miskolc, Hungary
Ádám Rácz ; Institute of Raw Material Preparation and Environmental Processing, University of Miskolc, 3515 Miskolc, Hungary
Gergely Mag ; Institute of Raw Material Preparation and Environmental Processing, University of Miskolc, 3515 Miskolc, Hungary
Gábor Antal ; Institute of Raw Material Preparation and Environmental Processing, University of Miskolc, 3515 Miskolc, Hungary
Barnabás Csőke ; Institute of Raw Material Preparation and Environmental Processing, University of Miskolc, 3515 Miskolc, Hungary

Abstract

This paper deals with the development of a volume based closed-cycle grindability test method based on the recently introduced Universal Hardgrove mill and procedure. Five model materials with various origin and material characteristics (hardness, grindability, heterogeneity) were chosen for the experiments, i.e. limestone, quartz, andesite, basalt and cement clinker. The grindability of the material was characterized simultaneously in four various ways: 1) the standard Hardgrove Grindability test (HGI), 2) Bond work index calculated from HGI, 3) the conventional Bond test and 4) the closed-cycle volume based grindability test in the Universal Hardgrove mill. The grindability coefficient (G), and the cumulative particle size distribution of 80% passing size (x80) of the product of the closed-cycle Hardgrove test were determined. Relative deviation of the above parameters was very good (in most cases lower than 3%) which indicates the new proposed method as a robust procedure for rapid determination of specific grinding energy of closed cycle grinding in ring mills. Therefore, this test is able to ease the optimization of grinding conditions relatively fast and reliably.

Keywords

universal Hardgrove mill;  bond index;  grindability;  specific grinding work; closed-cycle grinding

Hrčak ID:

228197

URI

https://hrcak.srce.hr/228197

Publication date:

11.11.2019.

Article data in other languages: croatian

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