By S. Komar Kawatra
Advances in Comminution comes at a severe time. It makes a speciality of the issue of wanting to grind fabrics to ever-finer sizes whereas conserving average strength expenses. the choice and sizing of stirred turbines for regrinding and ultrafine grinding purposes don't lend themselves to traditional methodologies; consequently, new methods are being constructed. there's a good deal of task directed towards bettering ore characterization to foretell AG/SAG mill strength requisites, in addition to constructing stronger versions and instrumentation for optimization and keep an eye on of comminution circuits. Instrumentation, modeling, and keep watch over features specifically have benefited from speedily advancing laptop expertise, with calculations that have been previously tremendous time-consuming changing into quick and regimen. those advances will preserve strength waste to a minimal and should give you the elevated strength potency had to keep ongoing good fortune. The 36 chapters are according to the 2006 SME symposium. subject matters and members have been rigorously chosen to supply a stability among educational and business perform in order that the reader can conveniently locate info on present top practices and review destiny developments.
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Extra resources for Advances in comminution
Volume 2. Aachen, Germany. ———. 1997b. Towards the development of a work index for the roller press. Paper presented at SME Comminution Practices Symposium, Denver, CO. Klymowsky, R. 1998. Roller press installations in iron ore. World Mining Equipment (April). ———. 2003. High Pressure Grinding Rolls for Minerals. McGill Presentation. , and Cordes, H. 1999. The modern roller press—practical applications in the ore and minerals industry. Aufbereitungs Technik 40(Nr 8). , and Knecht, J. 2002. Selection and sizing of high pressure grinding rolls.
This paper examines the conditions (such as the press force necessary) that lead to energy savings, lower operating costs, and the optimum performance of the HPGRs. Wide variations occur in ores, even within one deposit. These variations, insofar as they affect the performance of an HPGR, need to be quantified with meaningful HPGR indices. Two such indices are the ATWAL Wear Index (ATWI) for wear due to abrasion and the Polycom Grinding Index (PGI) for quantifying the fines production. * Polysius AG, Neubeckum, Germany 51 52 ADVANCES IN COMMINUTION FIGURE 1 ADVANCED COMMINUTION TECHNOLOGIES Installation of an HPGR in a copper concentrator in the United States in 1994 A laboratory ball mill test, the Labmill test, is described to overcome the uncertainty about the energy required for ball milling after an HPGR.
The associated moisture would, however, be detrimental to this process, and some form of blending with dry material might be necessary. Ultimately, with very fine mill feeds, the number and size of conventional wet screens will become unmanageable, while the ball mills will trend ever smaller. The next step is to abandon screens and ball mills entirely and operate HPGRs in closed circuit with air separators, with the final product repulped and fed directly to flotation or other downstream processes.