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HPGR - High Pressure Grinding Roll for the Minerals Industries

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HPGR - High Pressure Grinding Roll for the minerals industries
FLSmidth is a world wide supplier of HPGRs. HPGR technology has been used in the cement industry for many years, and due to the success and effectiveness of this machine FLSmidth has invested in the development of HPGR technology for minerals industriesspecifically to hard rock applications such as copper, gold, iron ore, and many others. HPGR equipment is a modern and very energy-efficient comminution technology. During its relatively short history, HPGR technology has undergone significant development with machine roll wear surfaces & control philosophy. The HPGR, developed by FLSmidth, ranks among the most advanced and efficient units available. Itsdesign incorporates the vast experience and expertise gained since HPGR technology was first introduced. If HPGRs are run correctly ball mills can be downsized and use smaller grinding media which will reduce steel ball consumption in the BM circuit substantially. HPGR also promotes micro fracturing to expose minerals encased within the particular ore which increases liberation via recovery.Global Installations
• Canada • China • Columbia • Denmark • India • Indonesia • Korea • Malaysia • Saudi Arabia • Thailand • Turkey • United Kingdom • USA 2 6 1 2 9 10 6 1 3 7 2 1 2

A flexible solution The HPGR is a flexible solution, highly suitable both for upgrades and for new installations. Upgrading may increase capacity by up to 80 percent, while the total specific energyconsumption of new installations may be reduced by 20-30 percent compared with conventional grinding systems. The most typical process configurations are described on pages 9-13.
Besides the cost-saving features already mentioned, the HPGR is characterised by: • Long wear part life • Low operational and maintenance costs • Short shutdown for wear part replenishment

How it works & benefits Inhigh-pressure grinding roller comminution the feed material is exposed to very high pressure for a short time. The high pressure causes the formation of microcracks in the feed particles and generates a substantial amount of fine material.
The pressed material can be fed directly to a given size ball mill, making it possible to increase the throughput of a given size ball mill and reduce thespecific power consumption of the whole mill system.

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Features

Advanced skew control The FLSmidth HPGR press incorporates roller skew control via the hydraulic power unit. This system keeps the two roller assemblies parallel during operation, thus reducing grinding pressure deviation across the roller width which in-turn increases the consistency of the grinding process. Tramp control TheFLSmidth HPGR includes a new to the industry, patent-pending hydraulic system capable of accommodating large shocks. This system helps protect the critical roller surface from incidents such as tramp metal bypassing upstream metal detectors. The FLSmidth system utilizes a specially configured hydraulic accumulator which instantly activates without a PLC needing to shift hydraulic valves.

Gabledframe A gabled frame allows for easier maintenance and replacement of the roller assembly. Step 1: 1. Remove upper L-gable pins 2. Support gearboxes 3. Disconnect gearboxes Step 2: 1. Swing out L-gable Step 3: 1. Pull “fixed roller” towards L-gable 2. Remove “fixed roller” from HPGR 3. Remove cheek plates/feed gate 4. Pull “moveable roller” towards L-gable 5. Remove “moveable roller” from HPGR 6.Install new “moveable roller” 7. Pull new “moveable roller” to position 8. Install cheek plates/feed gate 9. Install new “fixed roller” 10. Pull new “fixed roller” to position 11. Swing in L-gable Step 4: 12. Install 2 upper L-gable pins 13. Reconnect gearboxes 14. Install safe guards

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HPGR - High Pressure Grinding Roller

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