Investigation on multicomponent semi-autogenous grinding

Bueno, Marcos, Shi, Feng N., Kojovic, Toni and Powell, Malcolm (2010). Investigation on multicomponent semi-autogenous grinding. In: XXV International Mineral Processing Congress - IMPC 2010 'Smarter processing for the future. International Mineral Processing Congress 2010, Brisbane, Qld, Australia, (611-618). 6-10 September, 2010.

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Author Bueno, Marcos
Shi, Feng N.
Kojovic, Toni
Powell, Malcolm
Title of paper Investigation on multicomponent semi-autogenous grinding
Conference name International Mineral Processing Congress 2010
Conference location Brisbane, Qld, Australia
Conference dates 6-10 September, 2010
Convener Ralph J. Holmes
Proceedings title XXV International Mineral Processing Congress - IMPC 2010 'Smarter processing for the future
Place of Publication Carlton, VIC, Australia
Publisher Australasian Institute of Mining and Metallurgy
Publication Year 2010
Year available 2010
Sub-type Fully published paper
ISBN 9781921522284
Start page 611
End page 618
Total pages 8
Collection year 2011
Language eng
Abstract/Summary AG/SAG mill feed often contains several components which may have different hardness or SG. The ‘hard’ component may act as grinding media to break the ‘soft’ component and remain in the mill the longest. The build up or absence of a high SG component when the AG/SAG mill is treating a multi-component feed can cause the mill power prediction to be significantly in error. In order to investigate the grinding behaviour and the interaction of multicomponent materials in a mill, a new semi-autogenous locked-cycle test was developed. The investigation was carried out in a 600 mm diameter laboratory mill, using quartz and BIF (banded iron formation) ore, tested as pure components and in binary mixtures. When the equilibrium is reached, the test simulates a steady-state continuous operation, where the closing screen represents the mill grate classification. The experiment typically reaches equilibrium after a few 20-min cycles, when the mill product and recycle composition become stable and the total amount of each component in the product and feed equalise. At the end of each test a full sizing and composition analysis of the mill product and load was performed, using magnetic separation to quantify the proportion of BIF in each size fraction. The mill load and comminution behaviour was found to be controlled by the hard component, as expected, but in a highly non-linear manner. The other key finding was the marked differences in the product size distributions for each component when they were ground alone and in mixtures. The important behaviours and trends are discussed.
Keyword SAG mill
Multi-component ores
Ore blends
Grinding test
Q-Index Code E1
Q-Index Status Confirmed Code
Institutional Status UQ

 
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Created: Thu, 09 Dec 2010, 12:53:10 EST by Karen Holtham on behalf of Julius Kruttschnitt Mineral Research Centre