Abstract
A pilot scale test program was conducted to evaluate the size reduction performance of HPGR (High Pressure Grinding Rolls) operating in different circuit configurations. For this purpose a series of pilot-HPGR locked cycle tests were performed with medium and high pressures to simulate the HPGR operation in closed circuit with a screen, with partial product recycle, and with edge recycle. Logged instrumentation data such as roller speed, working gap, operating pressure, and power draw were used in combination with material test results such as particle size distributions, flake density, flake thickness, and bulk density of the feed for calculation of HPGR operational parameters. The paper reports the results from the pilot HPGR test work. The analysis reported herein includes an evaluation and comparison of different circuit configurations of the HPGR operation in terms of energy consumption, capacity and product fineness and also discusses the benefits of various circuit arrangements.
Highlights
During the last decade, there have been considerable improvements in comminution efficiency
The first commercial application of HPGR was in 1985 and its success resulted in increasing numbers of applications since in the cement industry (Kellerwessel, 1990)
HPGR’s are being used to significantly reduce the energy required for grinding, but there are opportunities to better utilise this technology in novel flowsheet arrangements to result in further energy reduction
Summary
There have been considerable improvements in comminution efficiency. The improvements are due to the optimal design of grinding systems and operating variables that enable more efficient use of existing comminution devices, and due to the development of comminution devices with the ability to enhance energy utilisation. The HPGR was one of these new energy efficient comminution devices. The first commercial application of HPGR was in 1985 and its success resulted in increasing numbers of applications since in the cement industry (Kellerwessel, 1990). A number of new large hard rock mining operations have incorporated HPGR in their grinding circuit instead of the conventional AG/SAG mill (Morley, 2003; Rosario & Hall, 2010; Von Michaelis, 2005, Hart et al, 2011). HPGR’s are being used to significantly reduce the energy required for grinding, but there are opportunities to better utilise this technology in novel flowsheet arrangements to result in further energy reduction
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