Improving the recovery of coarse coal particles in a Jameson cell.pdf

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Improving the recovery of coarse coal particles in a Jameson cell.pdf

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Improving the recovery of coarse coal particles in a Jameson cell

This article is also available online at: /locate/mineng Minerals Engineering 19 (2006) 609–618Improving the recovery of coarse coal particles in a Jameson cell J. Cowburn a,*, G. Harbort b, E. Manlapig b, Z. Pokrajcic a a Xstrata Technology, Level 2, 87 Wickham Terrace Spring Hill, Brisbane, QLD 4000, Australia b Julius Kruttschnitt Mineral Research Centre, Isles Road, Indooroopilly, OLD 4069, Australia Received 11 July 2005; accepted 6 September 2005 Available online 24 October 2005Abstract It has been observed in several Jameson cell installation where the source for flotation feed is deslime screens, that the recovery of coal particles greater than 0.5 mm is not as great as that of finer material. Consequently, a research project was undertaken at a CHPP in the Bowen Basin Queensland to assess the possibility of increasing the recovery of coarser particles (+0.5 mm) within the downcomer of the Jameson cell. The effect of decreasing turbulence and agitation in a commercial-scale downcomer was investigated to assess the effect on the recovery of both coarse and fine coal particles. This paper details the findings of the test work, summarising the results relating to differences in the operating parameters within the downcomer. 2005 Elsevier Ltd. All rights reserved. Keywords: Coal; Froth flotation and particle size1. Introduction Coal flotation has been active in Australia since 1970 when there were 16 mechanically agitated cells in operation (Post, 1975). However, it was not until 1990 that it became widely accepted as an economical method of treating fine coal. The first Jameson cell was installed at Newlands Coal Handling and Preparation Plant (CHPP) in 1990 treating coal slimes. Since that time the Jameson cell flotation machine has become the recognised technology in Austra- lia for fine coal flotation with 90 cells installed in Australia and 115 worldwide (Xstrata Technology Website). The Jameson cell is a high intensity flotation device, which uti- lises