Comparing energy efficiency of multi-pass high pressure grinding roll (HPGR) circuits

Hilden, Marko and Suthers, S. (2010). Comparing energy efficiency of multi-pass high pressure grinding roll (HPGR) circuits. In: , XXV International Mineral Processing Congress - IMPC 2010 'Smarter processing for the future. International Mineral Processing Congress 2010, Brisbane, Qld, Australia, (801-811). 6-10 September, 2010.

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Author Hilden, Marko
Suthers, S.
Title of paper Comparing energy efficiency of multi-pass high pressure grinding roll (HPGR) circuits
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 801
End page 811
Total pages 11
Collection year 2011
Language eng
Abstract/Summary With increased emphasis on reducing costs and carbon emissions in mineral processing, it is becoming essential to employ the most efficient comminution devices and to use them to maximum effect. High pressure grinding rolls (HPGR) are considered highly efficient compared with other devices, however their relative efficiency in multi-HPGR circuits is less well understood. A series of comminution tests was carried out to evaluate three multi-pass HPGR circuits and a jaw crusher-ball mill circuit. Combinations of HPGR units (1.0 m and 0.25 m diameter), jaw crushers and Bond ball mills were used to grind a 32 mm top size porphyry copper feed (BBWI = 12.1) to a product P80 size of about 150 μm. Up to three passes of HPGR were used in each circuit, with energy measurement and size analysis at each point in the comminution process. The energy efficiencies of individual comminution stages and of the overall circuits were quantified and evaluated using three different approaches. The operating work index method for comparing comminution energy efficiency underestimated HPGR performance due to the large amount of fines generated. The -75 μm efficiency factor and F50/P50 reduction ratio interpolation methods both give a fairer measure because they better take into account the amount of fines generated by HPGR. The results show that the relative comminution efficiencies of the three multi-pass HPGR circuits tested differ by as much as 22%, providing insights as how to best employ HPGR in a comminution circuit. The most energy efficient of the circuits tested was a three-pass HPGR circuit with a 1.0 m diameter roll on the first pass in closed circuit with an 8 mm screen followed by a second and third pass in a 0.25 m roll.
Keyword HPGR
High pressure grinding
Comminution
Energy efficiency
Multi-pass
Q-Index Code E1
Q-Index Status Confirmed Code
Institutional Status UQ

 
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Created: Thu, 09 Dec 2010, 15:53:58 EST by Karen Holtham on behalf of Julius Kruttschnitt Mineral Research Centre