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Some Comminution Experiences of an Industrial Mixed Sulphide Ore in a Pilot Plant

By ALFANO G., SABA P. and SURRACCO M

Abstract

The performance of an industrial grinding-classification circuit has recently been investigated. The aim was to obtain a screw classifier overflow with dmax 150 mm grains with dmax = 400 mm and of < 10 mm grains reporting in the overflow. Therefore, a complete overhaul of the entire plant set up was required, in particular, the perform-ance of the grinding-classification circuit, which leaves room for improvement. This paper is con-cerned with the results obtained from a systematic experimental investigation carried out in a pilot plant, comprising a ball mill and screw classifier, varying the different influencing parameters. We achieved a classification efficiency 66.7 ¸ 70.4 %, an imperfection 0.42 ¸ 0.48, a classifier overflow with 150 mm 0.1 ¸ 0.2 %. Pilot plant energy consump-tion was 8.10 kWh per t treated, of which, on average, 7.94 kWh/t with respect to industrial grind-ing section. Further improvement in the performance of the pilot plant grinding section can be probably achieved replacing the screw classifier with a hydrocyclone

Topics: grinding, classification, ball mill, screw classifier, hydrocyclone
Publisher: A. Akar; U. Ipekoglu; I. Cocen; M. Polat
Year: 2004
OAI identifier: oai:iris.unica.it:11584/16715
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