For abovementioned projects, theHPGRoption indicated a gross power consumption reduction over a similarSAG mill grinding circuit. The overall operating cost savings were of the order of 15%. Indications are that the capital costs for theHPGRoption washigherthan theSAG milloption.
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HPGR test results published by Grier (1992) on gold ores from the Mt. Todd project showed significant energy savings for aHPGR/Ball Millcircuit as compared to aSAG/Ball Millplant. By adding a Polycomhigh-pressure grinding roll, the throughput of existing plants can be increased by as much as 150% while simultaneously reducing the power consumption by up to 20%.
Thehighunit capacitySAG mill/ballmillcircuit is dominant today and has contributed toward substantial savings in capital and operating costs, which has in turn made many low-grade,high-tonnage operations such as copper and gold ores feasible. Future circuits may see increasing use ofhigh pressure grinding rolls(Rosas et al., 2012).
2014822dinghighpressure grinding rolls hpgr, typically used in the final stage of crushing, compress the coarse ore between two cylinders they may use 10 to 20 per cent lesspowerthansag millson the other end of the size spectrum,stirred mills. Read More.
The results showed that theHPGR-ball millcircuit achieved a 21% reduction in energy consumption over the existingSAG-ball millcircuit at the same P80grindsize of 160 mircons (μm). At agrindof 80% passing 75 μm, theHPGR-stirred millcircuit showed a 34% reduction in …
Apr 25, 2018· “The main attraction toHPGRsis that they are highly efficient compared toSAG/AG millsand also due to their superior ability to process highly competent ores,” has been that they use about 17 to 25 percent less energy thanSAG millssaid Dziedzina.
One of the workhorses of the minerals industry is the autogenousgrinding(AG)milland its derivative the semi-autogenous (SAG)mill. These are relatively well understood, but not so Scrubbers.
High Pressure Grinding Rolls (HPGR) is a mature technology that is proven to reduce capital and operating costs in full scale plants when compared to other comminution technologies. SGS comminution experts have developed a simple testing methodology to avoid some of the difficulties associated with using HPGR.
High pressure grinding rolls (HPGR) are used for size reduction or rocks and ores. They compress the feed material between two rotating rollers, one of which is in a fixed position and another roller that is floating. The two rotating rollers generate such ahigh pressurethat it grinds the feed material to the desired smaller grain size.
Comparison of HPGR-BallMill and HPGR-Stirred Mill Circuits tothe existing AG/SAG Mill-BallMillCircuits Abstract In the past 20 years, the energy-efficient comminution technologies, includinghigh pressure grinding rolls(HPGR) andhighspeed stirredmill, have been developed and adopted in the hard-rock mining operation in order to reduce ...
The Huckleberry mine, located in British Columbia, produces roughly 40 million lb/y of copper. A comprehensive energy and cost study compared an existingSAG mill-based circuit at the Huckleberry mine with two proposed circuits involving comminution technologies that are associated with energy efficiency:high-pressure grinding rolls(HPGR) andhigh-speed stirredmills.
A typicalSAG-HPGR-Ballmillcircuit suggested by Patzelt et al. is shown in Figure 9.6, where the pebbles from theSAG millare crushed in thehigh-pressure grinding rolls. It is a general observation thatSAG millsare helpful forgrindingwhere wide variations in the grindability of ores are experienced.
DOI: 10.14288/1.0073557 Corpus ID: 138251706.Comparison of HPGR - ball mill and HPGR - stirred mill circuitsto the existing AG/SAG mill- ballmillcircuits @inproceedings{Wang2013ComparisonOH, title={Comparison of HPGR - ball mill and HPGR - stirred mill circuitsto the existing AG/SAG mill- ballmillcircuits}, author={Chengtie Wang}, year={2013} }
Over the past several years, the combination of higher energy and steel costs and the recent commercial deployment ofhigh-pressure grinding rolls(HPGR) technology in hard rock mining have led many multinational mining companies to evaluate the suitability of HPGR technology for their particular comminution circuits. HPGR technology is perceived to require a higher capital investment while ...
The following paper extends this approach to encompass jaw, gyratory and cone crushers as well asHigh Pressure Grinding Rolls(HPGR). The technique is applied to three different comminution circuits and their overall specific energies are compared. All of the calculations involved are …
One of the workhorses of the minerals industry is the autogenousgrinding(AG)milland its derivative the semi-autogenous (SAG)mill. These are relatively well understood, but not so Scrubbers.
Apr 25, 2018· A few years ago, Freeport-McMoRan Inc. (FCX) chosehigh-pressure grinding rolls(HPGR) over a semi-autogenousgrinding millfor the expansion of its Morenci open-pit copper mine in Arizona. In February of this year, Iamgold announced it too would be using HPGRs at its new Côté Lake project in northern Ontario. The same month, Altura Mining also revealed it would be using HPGRs for its ...
Modelling The Influence On Power Draw Of The Slurry Phase In Autogenous (AG), Semi-Autogenous (SAG) And BallMillsOre Change, Ball Load And Material Flow Effects On An Energy BasedSAG MillModel Overall Specific Energy Requirement Of Crushing,High Pressure Grinding RollAnd TumblingMill…
Millapplication features. Frozen charge protection – Detects frozen charge in themill, minimizing equipment wear and liner replacements.; Coupling supervision – Detects if a failure or slippage occurs in the couplings and stops the system in case, preventing major damages.; Stand-still detection – Prevents the motors from re-starting if themillis still rocking or moving after a stop ...
The wear parts within ourHigh Pressure Grinding Rollare long-lasting, but also very easy to replace when they do wear down. Up to 20-30% reduced energy consumption Energy efficiency is key to running a profitable operation, so saving 20 to 30% could pay huge dividends.
