Accueil / Moulin Hpgr Vs Sag

This paper examines the development of several order of magnitude trade-off studies to evaluate the application of High Pressure Grinding Rolls (HPGR) technology in …

Plus de détailsCarbon footprints of AG/SAG vs HPGR circuits3.1. AG/SAG – Ball mill circuits. Tozlu and Fresko (2015) estimated that the total installed motor capacity of AG/SAG mills in hard rock mining in 2015 was 5.8 million kW (see Fig. 1). Given that mining industry activity has been relatively slow since then, additional sales of AG/SAG mill capacity ...

Plus de détailsAs part of the feasibility study, a trade-off study to evaluate the HPGR as an alternative technology to the conventional SAG milling process for the Ruby Creek project was completed. The plant was designed with a conventional SAG milling process to operate at a capacity of 20,000 tonnes per day with an availability of 91 percent and an overall ...

Plus de détailsM. Bueno, B. Foggiatto, G. Lane SAG Conference Vancouver, Canada September 22 – 26, 2019 ABSTRACT This paper presents an assessment and trade-off study of high-pressure grinding rolls (HPGR)-based vs. autogenous grinding (AG)-based milling options for a 65 kt/d copper/gold project. The study rel...

Plus de détailsThis paper reviews recent HPGR applications for the processing particularly of copper, gold, platinum, PGM-Ni-Cu and iron ores. HPGR technology is discussed with respect to energy efficiency. The harder the ore the greater the energy savings are likely to be. Typical energy savings of 10–20% can be expected when installing HPGR vs. a SAG mill ...

Plus de détailsHigh Pressure Grinding Rolls (HPGR) In Comparison to SAG Milling Technology Presented by: Hassan Ghaffari, P.Eng. Raytcho Anguelov, P.Eng. Jake Alexander, MBA • HPGR …

Plus de détailsThe high pressure grinding rolls (HPGR) is a. relatively new comminution device that offers realistic potential in. dramatically reducing comminution energy requirements. As such, it is. viewed as an alternative to the existing, less energy efficient processes. such as semi-autogenous (SAG) and ball mills.

Plus de détailsA typical HPGR-circuit product approaches the fines generation of an SAG-circuit product, both with markedly more fines than a crushing circuit. Of note is that while the HPGR improves comminution efficiency, the savings in overall circuit power requirements can be reduced or even negated by an increase in conveying and pumping …

Plus de détailsSAG mills are extremely sensitive to variation in ore strength, and hard ore processing may consume up to 15 kW·h/t of electric energy, while the energy consumption by HPGR is never more than 2.5–3.5 kW·h/t even in grinding the hardest ores. Nevertheless advantages and shortcomings of HPGR should be compared with SAG mills in each individual

Plus de détailsThis paper discusses the results from the pilot scale HPGR and laboratory scale ball mill test programs. The effect of circulating load and classification efficiency on the performance of ball ...

Plus de détailsApplication to HPGR vs SAG trade off studies – reducing energy consumption Fuerstenau et al (1999) attempted to find ways to reduce energy consumption in comminution where dolomite was ground in a hybrid grinding system comprising a laboratory-scale HPGR and a ball mill in series.

Plus de détailsBased on the latest study, comminution operating costs for the HPGR circuit are estimated to be $3.75 per metric ton (mt) processed compared to $5.62 per mt for the SAG milling circuit that was used in the 2018 PEA. Lumina said FL tested a master composite made from four PQ drill holes to evaluate the viability of HPGR.

Plus de détailsFor typical circuits that involve AG/SAG, HPGR or ball milling, the generation of -75 µm material (denoted as SSE75) is a suitable marker size with which to benchmark performance because it contains 80% of the surface area generation 1 and energy is proportional to surface area generation 2. As shown in Figure 1, whereas the Bond …

Plus de détailsnavigation search HPGR or SAG? Choosing an appropriate grinding configuration is important for conceptual design. Here are some things to consider when making the …

Plus de détailsWhere 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.

Plus de détailsPlant 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 …

Plus de détailsHPGR technology is perceived to require a higher capital investment while delivering lower long-term operating costs. This paper undertakes a critical evaluation of this perception. ... 2006, "HPGR versus SAG mill selection for the Los Bronces grinding circuit expansion," Proceedings of the 2006 Conference on Semi-Autogenous Grinding (SAG ...

Plus de détailsraising the availability to > 94% to match those of SAG mills. The large scale test currently being conducted on a hard abrasive gold ore will prove that this technology is now ready to challenge conventional circuit design. Maximum feed size vs roll diameter 0 10 20 30 40 50 60 70 80 0.5 1.0 1.5 2.0 2.5 Roll diameter [ m ]] m-dot = 200 225 250

Plus de détailsAn HPGR cannot replace a SAG mill. Also required to get the feed into the HPGR is a secondary crusher(s) and perhaps a tertiary crusher(s). The HPGR is often a quaternary crushing device which is the reason that the footprint for an HPGR plant is so large.

Plus de détailsHPGR wear vs conventional mills Ball, SAG and rod mills all require their grinding media to be regularly replaced, unlike a HPGR. High Pressure Grinding Rolls have lower …

Plus de détailsPlant 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 Screens and conveyors 0.5 MW Screens and Conveyors 1.5 MW Total drive capacity installed 21.95 MW 17.45 MW

Plus de détailsAs an example, if you expect to grind an ore from 200 mm size to 1 mm size, the use of the HPGR instead SAG/FAG requires the addition of 1…2 crushing phases, consequently the FAG/SAG cannot be replaced by HPGR only. If we add the screening, handling and feeding equipment CAPEX and OPEX, the comparison work will be more complex.

Plus de détailsFor the mining industry, our semi-autogenous (SAG) grinding mill uses a minimal ball charge in the range of 6-15 percent. It is primarily used in the gold, copper and platinum industries as well as in the lead, zinc, silver, and nickel industries. Autogenous (AG) grinding mills involve no grinding media as the ore itself acts as the grinding media.

Plus de détailsHPGR Equation 1 for HPGR's crushers is written as: (( 2 ) (1)) 3 4 2 1 f x f x Wh = ShK Mih x − x (9) Sh = coarse ore harness parameter as defined by equation 8 and with K s set to 35 K3 = 1.0 for all HPGRs operating in closed circuit with a classifying screen. If the HPGR is in open circuit, K 3 takes the value of 1.19.

Plus de détailsIn HPGR vs. SAG comparison studies, the HPGR option is typicall y predicted to r equire less total . circuit specific energy. While other methods may be applied to th e conventional SAG circuit .

Plus de détailsBased on the latest study, comminution operating costs for the HPGR circuit are estimated to be $3.75 per metric ton (mt) processed compared to $5.62 per mt for the SAG milling …

Plus de détailsIn 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 ...

Plus de détailsThe most common benefit cited for HPGR is a higher energy efficiency than tumbling mills; often this is a very simplistic "1.5 kWh/t in HPGR versus 5.0 kWh/t in SAG". The flaw in this reasoning is that the overall energy in the circuit is more important than comparing the energy in a single stage – the overall energy savings of an HPGR ...

Plus de détailsA comprehensive energy and cost study compared an existing SAG mill-based circuit at the Huckleberry mine with two proposed circuits involving comminution technologies that are associated with energy efficiency: …

Plus de détailsAn additional barrier is that existing SAG circuits will not be scrapped to make way for a new process. It is proposed that there is considerable potential to make use of the complementary strengths of both comminution devices by adding the HPGR to current circuit expansions, and possibly incorporating a SAG/HPGR duo into new circuit design.

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