However, the design project includes a trade-off study between SABC and Crushing/HPGR/ball mill circuits. Hence in this particular example, as Bond crushing and ball mill work index tests cannot be used to size SAG mill and HPGR circuits the project cannot be carried out and the ore charcaterisation programme has to be re-done with …
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The HRC3000, the world's largest roller press (or HPGR)—with a capacity of 4928 t/h—used for fine crushing in a closed circuit with screens from Schenck Process (Germany), 4 × 10 m, was successfully implemented in the Metcalf plant (United States) . SAG mills (Outotec, Finland) work well in SAG operations.
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HPGR test results published by Grier (1992) on gold ores from the Mt. Todd project showed significant energy savings for a HPGR/Ball Mill circuit as compared to a SAG/Ball Mill plant. 1/14 By adding a Polycom high-pressure grinding roll, the throughput of existing plants can be increased by as much as 150% while simultaneously reducing the ...
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A HPGR trade-off study is now part of the typical due diligence process when assessing the suitability of SAG milling circuits, particularly for large-scale, hard rock applications with moderate to high ... (SAG mill, ball mill and pebble crusher) treating about 8.5-9.0 Mt/a of fresh ore. Orway Mineral Consultants (OMC) has been involved with ...
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Where HPGR technology has replaced traditional methods of crushing and grinding (e.g. SAG or ball mills), it has: Provided excellent throughput capacity and energy efficiency. Decreased energy consumption by up to 40%. Substantially reduced water consumption. Reduced recirculation and wear within crushing and grinding circuits.
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3.3.1 AG/SAG Mills The power-based approach to design uses a methodology which, given certain ore breakage characteristics, predicts the specific energy for a …
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In a recent publication (SAG 2015), we presented a non-conventional HPGR-Ball mill circuit as a lower capital cost alternative to the "standard" HPGR circuit. The circuit was designed for the treatment of a hard ore and relatively high tonnage (50,000 t/d). That paper provided details such as flowsheets, layouts, and equipment lists for the ...
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For ores with hardness parameters above the break-even point, HPGR circuits could offer economic benefits, while for softer ores, SAG mill/ball mill/pebble crushing (SABC) circuits are likely to be more economical and energy efficient. This evaluation considers both an SABC reference circuit and a traditional stage crushing configuration.
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High Pressure Grinding Rolls. Used in mining applications for the last 30 years, HPGR technology has streamlined the transition between mineral grinding and crushing by …
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2. Description of a HPGR A HPGR is principally a horizontally mounted double-roll mill, equipped with hydraulic pistons on one side, pressing against the floating roll - the other roll being fixed in the frame. The main components of the machine are of course the rolls, the bearings, frame, pressure beams, hydrau-
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It's easy to compare the SAG mill to the HPGR and the extra cone crushers, and forget all the material handling and the extra people and the larger footprint. Energy savings is …
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Maximise ore characteristics and increase productivity with our powerful JK Drop Weight Test - an industry standard for use in characterising ore under AG/SAG milling conditions. The JK Drop Weight Test provides ore specific comminution parameters that are used in the JKSimMet software to analyse and/or predict crusher and AG/SAG mill performance.
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The third comminution circuit, representing a new installation option, also includes a HPGR but does not feature a SAG mill. Instead the HPGR is used to generate two product size fractions, one ...
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So far we have clarified that HPGR doesn't replace s SAG mill and hence these two machines can't be compared. We need to compare the HPGR …
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The study looks at patterns in mining type, mill processing type, mineral type, and the differences between costs expressed in feasibility studies vs. operating mines.
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Cadia's HPGR-Ball Mill Versus HPGR-SAB Circuits and Their Comminution Efficiency (C. Haines) 14:00 14:15 Paper 16 Comparison of pilot and industrial scale AG/SAG mill performance – A case study on UG2 Platinum ore (S. Nkwanyana) 14:00 14:15 Paper 16 PTFI & RME Collaboration: Technology Makes Mill Relines Safer and More …
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On dry SAG mills end liners: Physical modeling, DEM-based characterization and industrial outcomes of a new design. Miner. Eng. (2019) ... (DEM) to analyse the formation and evolution of wear of a lab-scale HPGR mill and to investigate how wear affects mill performance and particle breakage. By coupling the DEM model with the …
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HPGR or SAG? Choosing an appropriate grinding configuration is important for conceptual design. Here are some things to consider when making the choice between an HPGR …
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How HPGRs compare to conventional milling. Whether you're designing a brand-new mill circuit or optimising an existing site for long-term efficiency, High Pressure Grinding Rolls offer a range of advantages over …
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In addition to the operational cost savings, the introduction of a second on-line HPGR would result in an increase in the availability of the plant from the conventional SAG mill process availability of 91 to 96 percent. With HPGR in place, the power requirements of the grinding circuit would be reduced by more than 4kWh/tonne.
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3.2 Mine-to-Mill The feed size to AG and SAG mill circuits has been demonstrated to have a significant impact on throughput with effects such a that illustrated in Figure 7, being commonplace. Modifying blast design and primary crusher operation can significantly influence AG/SAG mill feed size, hence giving a potentially cost effective way to
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Process optimisation for your SAG Mill. Back. Total Cost of Ownership Tool. Back. Slurry Pumps. Dorrco™ Diaphragm Pumps ... and even enhance the performance of traditional grinding mills and fixed-gap crushers. The …
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Robust HRC™ high pressure grinding rolls (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 a high pressure that it grinds the feed ...
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In HPGR vs. SAG comparison studies, the HPGR option is typically predicted to require less total circuit specific energy. While other methods may be applied to the conventional SAG circuit
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The pros and cons of cone crusher applications. Henry Ballard 16/04/2021, 2:14 pm. A MC1150 cone crusher module that includes a feed bin with a variable speed vibrating feeder. Level indicators in both the bin and crusher hopper work to maintain a choked condition within the cone crusher chamber. John Flynn, of Jaques, …
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HPGR vs. SAG Advantages • Significant energy cost savings • Reduced grinding media consumption • Reduced overall operating costs • Reduced footprint • Higher …
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HPGR vs. SAG Advantages • Significant energy cost savings • Reduced grinding media consumption • Reduced overall operating costs ... Plant Concept SAG Circuit HPGR Circuit Equipment 1 x SAG Mill 9.8 MW 1 x Secondary Crusher 750 kW 1 x Pebble crusher 450 kW 1 x HPGR 4.0 MW 2 x Ball Mills 5.6 MW each 2 x Ball Mills 5.6 MW each ...
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