Prediction of Product Size Distribution of a Vertical Stirred Mill Based on Breakage Kinetics
In the last decade there has been an increase in demand for fine grinding due to the depletion of coarse-grained orebodies and an increase of processing fine disseminated minerals and complex orebodies. These ores have provided new challenges in concentrator design because fine and ultra-fine grinding is required to achieve acceptable recovery rates. Therefore, the correct design of a grinding circuit is important for minimizing unit costs and increasing product quality. The use of ball mills for grinding in fine size ranges is inefficient and, therefore, vertical stirred grinding mills are becoming increasingly popular in the mineral processing industry due to its already known high energy efficiency. This work presents a hypothesis of a methodology to predict the product size distribution of a vertical stirred mill using a Bond ball mill. The Population Balance Model (PBM) was used to empirically analyze the performance of a vertical mill and a Bond ball mill. The breakage parameters obtained for both grinding mills are compared to determine the possibility of predicting the product size distribution of a vertical mill based on the results obtained from the Bond ball mill. The biggest advantage of this methodology is that most of the minerals processing laboratories already have a Bond ball mill to perform the tests suggested in this study. Preliminary results show the possibility of predicting the performance of a laboratory vertical stirred mill using a Bond ball mill.
Digital Object Identifier (DOI): doi.org/10.5281/zenodo.1132527Procedia APA BibTeX Chicago EndNote Harvard JSON MLA RIS XML ISO 690 PDF Downloads 877
 A. Jankovic, W. Valery Junior and D. La Rosa, "Fine Grinding in the Australian Mining Industry," 11 July 2006. (Online). Available: http://www.metso.com/mini ngandconstruction/mct_service.nsf/WebWID/WTB-120 106-22576-A45AE/$File/043.pdf.
 N. Stehr and J. Schwedes, "Investigation of the Grinding Behavior of a Stirred Ball Mill," German Chemical Engineering, vol. 6, pp. 337-342, 1983.
 D. Stief, W. Lawruk and L. Wilson, "Tower Mill and its Application to Fine Grinding," Minerals and Metallurgy Processing, vol. 4, pp. 45-50, 1987.
 D. B. Mazzinghy, C. L. Schneider, V. K. Alves and R. Galéry, "Vertical Agitated Media Mill scale-up and simulation," Minerals Engineering 73, pp. 69-76, 2015.
 T. Napier-Munn, S. Morrel, R. Morrison and T. Kojovic, "Mineral Comminution Circuits: Their Operation and Optimisation," JKMRC Monograph Series in Mining and Mineral Processing 2, 1996.
 L. Austin, R. Klimpel and P. Luckie, Process Engineering of Size Reduction: Ball Milling, New York: SME, 1984.
 A. Gupta and D. Yan, Mineral Processing Design and Operation: An Introduction, Amsterdam: Elsevier, 2006.
 F. C. Bond, "The Third Theory of Comminution," AIME Transactions, vol. 193, p. 484, 1952.
 S. Morrel, U. Sterns and K. Weller, "The Application of Population Balance Models to Very Fine Grinding in Tower Mills," Proceeding of XIX International Mineral Processing Congress, 1993.
 R. Morrison, P. Cleary and M. Sinnott, "Using DEM to Compare the Energy Efficiency of Pilot Scale Ball and Tower Mills," Minerals Engineering, pp. 665-672, 2009.
 A. Jankovic, Mathematical Modelling of Stirred Mills, Brisbane: University of Queensland, JKMRC, 1999.