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three-pass HPGR circuit. Two approaches were found to be effective in generating a steeper product size distribution: 1. Removing excess fines from the feed to the HPGR (Figure 4a), and 2. Using a smaller diameter rolls in the second and/or third pass (Figure 4b). AB HPGR HPGR HPGR 2.0 mm Screen 48% 52% 1.0 m HPGR 1.0 m HPGR 0.25 m HPGR HPGR 8 ...


2006 for a HPGR to be installed in a copper processing circuit – the Freeport McMoRan-owned Cerro Verde mine, in Peru – and has taken even longer to filter down to precious metals mining. As recently as September 2019, Coeur Mining told investors during a site visit, "HPGR technology is relatively new to precious metals


ABB wins major grinding drive systems order for Cerro Verde expansion in Peru. ABB, a power and automation technology group was recently contracted to supply gearless mill drives (GMDs) for six ...


The breakthrough came in 2006 at the Cerro Verde copper ore project (Fig. 8) in Peru. By 2014, a total of 12 HPGRs had been supplied there, completely replacing an SAG concept. The comparison with a conventional grinding circuit with SAGs and ball mills returns a 21 % lower energy demand and annual operating cost savings of almost 15 mill.


'Acceptance of the HPGR in the hard rock sector has been slow and cautious, but has come to maturity in the successful commissioning of the Cerro Verde project' (Morley C, 2008). High pressure grinding roll (HPGR) technology has been the subject of many technical presentations in the minerals comminution fraternity ever since the


COMPARISON OF HPGR - BALL MILL AND HPGR - STIRRED MILL CIRCUITS TO THE EXISTING AG/SAG MILL - BALL MILL CIRCUITS by Chengtie Wang B.Eng., University of Science and Technology Beijing, 2009


The Cerro Verde Polysius HPGRs have 2 x 2500-kW VSD Twin drives offering an operational speed range of 360–1,200 rpm and a power factor of 0.96. At Ruby Creek two Humboldt Wedag HPGRs each have a 2 x 1150-kW VSD Twin drive system with an operational speed range 800–1,790 rpm.


Initial Cerro Verde HPGR evaluation and benchmarking studies; ... Flowsheet design for maximising flake size in graphite beneficiation ... HPGR circuits and tailings management. If you would like to discuss how these technologies may be able to provide additional value to your project / operation, ...


High Pressure Grinding Rolls (HPGR)High Pressure Grinding Rolls (HPGR) Cerro Verde milling circuit incorporates high pressure grinding rolls (HPGR) instead of SAG mills - 108,000 mtpd - Four 2.4 x 1.6 m HPGR's Advantages vs. SAG mills - Greater total energy efficiency - 2.4 kWh/t vs. 12.0 kWh/t - ~10% reduction in Bond Work Index of product


Cerro Verde is an open-pit copper and molybdenum mining complex that has been in operation since 1976. The available fleet consists of fifty 290-metric ton haul trucks and ninety-three 230-metric ton haul trucks (21 of which are currently on standby) loaded by thirteen electric shovels with bucket sizes ranging in size from 33 to 57 cubic meters and two hydraulic shovels with a …


High Pressure Grinding Rolls (HPGR) are being applied in the mining industry, often as a replacement for the conventional Semi-Autogenous Grinding (SAG) mill … High pressure grinding rolls—applications for the platinum …


Cerro Verde has a design capacity of 108,000 t/d of hard copper-molybdenum ore (average BWi of 15.3 kWh/t). The circuit is comprised of four 746 kW cone crushers, four 2.4 m D x 1.65 m L 5.0 MW VANCOUVER 2015 4 | Page HPGRs, and four 7.3 m D x 10.7m L (24 x 35 ft) 12 MW ball mills. The projected roll surface wear life is 6,000 hours.


Figure 3 — Mercury porosity measurements on Cerro Verde ore after HPGR crushing. Figure 4 — Comparison of leach kinetics between conventional cone crush and HPGR comminution.


Salobo and Cerro Verde Salobo and Cerro Verde are similar operations. Both process copper ores and HPGR was selected in opposition to AG/SAG grinding. The observed similarities are: (i) the top size of the HPGR feed is approximately 50 mm; (ii) the HPGR product is screened; the oversize closes the HPGR circuit and the undersize feeds the ball mill.


Sociedad Minera Cerro Verde S.A.A. fue diseñada por la necesidad de procesar sulfuros primarios (Calcopirita y Molibdenita). 1.2. HISTORIA Las operaciones de la mina Cerro Verde datan del siglo XIX. En esa época, los españoles extraían minerales de óxido de cobre de alta ley los que, posteriormente, eran enviados a Gales.


A linear measurement device on the back and front of the rolls are used to set the gap and monitor it during the operation of machine. As depicted in Fig. 3, CBU lab-scale HPGR has unique roll surface pattern, which enables material buildup and offers better nipping of feed. Fig. 2. Front view of CBU lab-scale HPGR.


The Cerro Verde Polysius HPGRs have 2 x 2,500-kW VSD Twin drives offering an operational speed range of 360–1,200 rpm and a power factor of 0.96. At Ruby Creek two Humboldt Wedag HPGRs each have a 2 x 1,150-kW VSD Twin drive system with an operational speed range 800–1,790 rpm.


High pressure grinding rolls (HPGR) are becoming an increasingly popular energy efficient solution for comminution of hard rock ores. A significant barrier to the increased adaptation of HPGRs is the current requirement for large amounts of sample for pilot testing. The primary objective of the research was to develop a DEM based computer model for an HPGR to …


ABB points out two typical examples of recent HPGR installations with variablespeed drive systems—the Cerro Verde copper mine in Peru and Adanac's Ruby Creek molybdenum operation in Canada. The Cerro Verde Polysius HPGRs have 2 x 2,500-kW VSD Twin drives offering an operational speed range of 360–1,200 rpm and a power factor of 0.96.


The circuit at Cerro Verde incorporates four HPGR units (2.4 m diameter x 1.6 m wide, 5,000 kW, processing 2,500 t/h), instead of traditional SAG mill circuit. Freeport-McMoRan's Grasberg mine in Irian Jaya, Indonesia, uses two HPGR units (2.0 m diameter x 1.8 m wide, 3,600 kW, processing 1,450 t/h). In 2010 ABB successfully


Cerro Verde Pro duc tion Unit Expansion The Cer ro Verde Produc tion Unit Expansion is cons idered not only wor ld- class, but is also the largest one -time built coppe r conce ntrator on the planet. Fluor, having successfully designe d and built the or iginal, 108,000 tpd Cer ro Verde C1 (debottleneck ed to 120,000 tpd)


Cerro Verde HPGR Rolls ... The very large size of the ore particles being leached, as much as two meters in diameter, should preclude any significant metal recovery. Dump leaching should not …


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A Cerro Verde expansion used a similar flowsheet as the 2006-commissioned circuit to triple circuit capacity. The expansion circuit includes …


The throughput capability of a high pressure grinding roll (HPGR), a critical process parameter, has been found to heavily depend on the sample type being processed. Existing HPGR test methods require the use of pilot machines and large sample quantities to assess the throughput characteristics of a certain ore type. Addressing the need for a laboratory scale HPGR test, a …


with lift at Boddington and Cerro Verde HPGR circuits was 55%, with the remainder consuming 45% of the power. This indicates that the ratio of vertical lift to horizontal transport (approximately 10% gradient) was consistent at these two sites at least and …


comminution At that time there were no HPGR installations in hard rock ore applications Parks 2000 wrote 39 Although HPGR does save power and reduce wear in Total comminution circuit 20 1 15 9 kWh t Table ІІI Comminution circuit specific energy–Cerro Verde Particle HPGR Conventional size Residue Gold


The difference in the ball mill sizing between a SAG circuit and an HPGR circuit comes down to two things: ... characteristic more amenable to HPGR than to SAG milling? Yes, Cerro Verde's PKP ore ...


Top ten lists for metallurgical and mineral processing . Top 10 mineral processing innovations in the last 20 years HPGR – Cerro Verde Boddington For competent uniformly hard orebodies with little or no clay content HPGR is a great alternative to SAG milling Freeport McMoRan s Cerro Verde operation Peru recently expanded to 360 kt d 397 000 stpd processing capacity using …


Examples are SM Cerro Verde (Vanderbeek, 2006), which was started up in 2007, and Boddington (Dunne et al., 2007), commissioned in 2009. Another significant driver is the relative stability in throughput rate and product size achieved by crusher-based circuits.


Mine Operations Using HPGR • Freeport McMoran, Cerro Verde, Peru – 2.4 m Dia x 1.7 m wide, 5 MW (2x2.5), processing 2,500 tph • Freeport McMoran, Grasberg Mine, Irian Jaya, Indonesia – 2.0 m Dia x 1.8 m wide, 3.6 MW, processing 1,450 tph • Nurkazgan Gold, Kazakhstan – 1.7 m Dia x 1.4 m wide, 2.3 MW, processing 1,000 tph


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PACIFIC BOOKER MINERALS INC

For the purposes of the Feasibility study, the Polysius 24/17 HPGR model was determined for the circuit. This machine is capable of processing 30,000 t/d and is currently in operation at Cerro Verde. It is assumed that the HPGR will produce a product with a P 80 of 3.8 mm.


Cerro Verde's four HPGR Polycoms 24/17 Cerro Verde is a copper-molybdenum concentrator. The circuit consists of four (4) HPGRs, rolls 2.4 m diameter x 1.65 m wide, working in closed-circuit with eight (8) 3 x 7.3 m wet screens. Each is powered by 2 x 2500 kW variable speed drive units. They were commis-sioned at the end of 2006.


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PRELIMINARY PROGRAM - Gecamin

Technology Innovation and Strategic Developments at Cerro Verde (TBC) Manager of Metallurgy and Strategic Development, Cerro Verde, FreePort-McMoRan, Peru ... The Optimum Number of Size Fractions: A Discussion on Number of Fractions per Sample for an Automated ... Model Based Laboratory/Plant Scale-up of HPGR Circuit Performance Jaime ...


Download : Download full-size image; Figure 17.11. Crusher-HPGR-ball mill circuit. Courtesy of Minera Cerro Verde. However, from a process standpoint, HPGRs produce a product with substantially more fines (for a given P80) than a crushing circuit. In this regard, the size distribution of an HPGR circuit is much more similar to the product of an ...