Hpgr Comminution Ppt

Comminution - SlideShare

06/03/2013· The test is essentially an indicator of an ores breakageresponse to SAG abrasion events.Recent Developments in ComminutionA relatively new comminution device, the high pressure grinding rolls (HPGR)adapted in cement industry and got …

Modelling of HPGR Edge recycling with progressive grinding ...

in ore grinding it has proven their benefits as compared to conventional comminution circuits. However, it is still possible to increase the HPGR advantages by applying the right flowsheet. Concepts like screen recycling versus edge recycling and progressive grinding are options for optimization of HPGR application for an individual ore. Therefore intensive test work has to be performed to ...

(PDF) HPGR Comminution for Optimization of Copper …

High-pressure grinding rolls (HPGR) are an accepted, but continuously expanding, comminution technology. The copper industry has a growing need to process harder ores with progressively lower ...

High Pressure Grinding Rolls (HPGR)

– Three HPGR units (2x2.65 MW each) Mine Operations Using HPGR • Anglo Platinum, Mogalakwene Platinum Mine, South Africa – 2.2 m Dia x 1.6 m wide, 5.6 MW (2x2.8), processing 2,400 tph . Projects Adanac Moly Corporation Ruby Creek Project, Feasibility Study 20,000 tpd Moly Ore Imperial Metals Inc. Mount Polley Project, Scoping Study Expansion from 20,000 to 30,000 tpd Copper Gold Ore ...

An overview of HPGR testwork program at Mintek

Head of Comminution, Minerals Processing Division, Mintek • Introduction •HPGR’s on site at Mintek •Key questions on HPGR •HPGR testwork program –Development/ Improvement of test procedures –HPGR operation –Flowsheetsdevelopment –Modelling and simulations –Downstream benefits –HPGR control •Conclusion Presentation overview. HPGR is maturing to become a competitive ...

High-Pressure Grinding

High-pressure comminution process research is a fundamental element of process design in the mining industry. Köppern has several semi-industrial sized pilot-plant facilities currently installed at the Bergakademie Freiberg, the University of British Columbia and also at research institutions such as Ammtec in Australia and Mintec in South Africa. Research and Development. Köppern ...

Institute o(Minillg alld Metallurgy Diamonds

Comminution in a HPGR takes place primarily through inter-particle comminution. In instances where the top size of the feed material is larger than the machine's working gap, single particle comminution precedes inter-particle comminution. In this case, these larger feed particles are nipped directly by the rolls and are pre-broken before entering the compression zone as illustrated by figure ...

High Pressure Grinding Rolls (HPGR) | SGS

HPGR have been used for many years and are emerging as an energy-efficient alternative to conventional and AG/SAG comminution circuits. One of the interesting features of HPGR is its capability to produce a particle size distribution with a greater than typical amount of fines, thus reducing the power requirement for the downstream ball mill. This makes the use of standard ball mill analyses ...

High Pressure Grinding Rolls - 911Metallurgist

The HPGR technology has the potential to provide a significant circuit efficiency increases from technological (better comminution efficiency) and economic (lower energy-consumption of crushing ...

Mineral Processing - SlideShare

15/05/2014· Comminution Communiation is one of the primary operations in mineral dressing ;takes place in a sequence of crushing and grinding processes. COMMINUTION - The whole operation of reducing the raw ore to the size required for mechanical separation or metallurgical processing. It is used to - create particles in a certain size and shape, - increase the surface area available for next process ...

Real and Potential Metallurgical Benefits of High Pressure ...

Rod Mill vs. HPGR - Tin Ore 70 60 50 30 10 Tin Distribution (%) Tin Distribution (%) 0 40 20 Rod Mill Rod MillHPGR HPGR Gravity Concentrate Gravity Tails Slimes +325M Material+325M Material -325M Slimes-325M Slimes (Modified After Clarke & Wills, 1989)

KEYNOTE: HPGR in Gold Leach Applications – an …

Other positive aspects of HPGR use in leaching increasingly confirm the value of this technology not only as a high(er) throughput, power- and steel-wear saving comminution system but as a metallurgical tool. These include but are not limited to the following: • Higher availability than any conventional crusher. • Studded tyre wear protection achieved lifetime of the rolls of more than ...

Comminution circuit design and simulation for the ...

The application of High Pressure Grinding Roll (HPGR) in comminution circuits is well established in processing cement, diamonds and iron ore. Recently, the application of HPGR has been extended to high-tonnage precious and base metals operations with hard ore. This is due to the HPGR: being more energy-efficient than grinding mills, not requiring steel grinding media, and providing higher ...

POLYCOM high-pressure grinding roll.

The required comminution pressure is transmitted via the floating roll. This method of high-pressure interparticle comminution produces compacted cakes of material contain-ing a high proportion of fines and coarser particles showing extensive cracking. Depending on the foreseen use of the product, the cakes can either simply be disagglomerated, or finish ground and fed to a separator. POLYCOM ...

Perfecting Hard-Rock High Pressure Grinding ... - E & MJ

Methods to allow additional use of HPGR in a comminution circuit include using both a tertiary and a quaternary HPGR ahead of the ball milling stage, using one HPGR with both dry- and wet- screening before ball milling, or HPGR plus dry/wet classification to produce a 125-micron finished product. The authors commented that the HPGR in quaternary mode is a powerful tool for capacity increase ...

(PDF) Grinding efficiency in HPGR product recycling

Based on the current work and previous investigations, it was found that HPGR comminution within a crushing circuit, in specific instances, can result in 2 ->10% increases in cop-per extraction ...

Comparison of HPGR - ball mill and HPGR - stirred mill ...

In the past 20 years, the energy-efficient comminution technologies, including high pressure grinding rolls (HPGR) and high speed stirred mill, have been developed and adopted in the hard-rock mining operation in order to reduce the energy consumption and improve the process performance. The combination of HPGR and stirred mill in a single flowsheet without tumbling mills has been …

Redefining Deposit’s Reserves by Advanced Mineral ...

Just considering the comminution process in open circuit operation, these savings may reach up to 50 % using HPGR. In combination of the mill with an air classifier in a closed circuit, the savings may still reach 10–25 % (8). The exact savings value depends on a variety of influences such as ore strength, recycling rate of mill product (9) and the process parameters of the mills compared. A ...

LATEST NEWS – Global Comminution Collaborative

High pressure grinding rolls (HPGR’s) have started to take a significant role in the comminution circuit. In the last 20 years HPGR technology has been extensively tested in the mining industry and there is a consensus currently that this technology is more energy efficient than the comparable conventional technologies. Still there is more room for technology development and improvement. In ...

Mineral Processing - SlideShare

15/05/2014· Comminution Communiation is one of the primary operations in mineral dressing ;takes place in a sequence of crushing and grinding processes. COMMINUTION - The whole operation of reducing the raw ore to the size required for mechanical separation or metallurgical processing. It is used to - create particles in a certain size and shape, - increase the surface area available for next process ...

Using Piston–Die Press Tests for Preliminary Sizing and ...

01/01/2019· A case study is presented to show how the current PPT method is used for engineering studies. ¦ KEYWORDS Empirical modelling, High-pressure grinding roll (HPGR), Piston–die press test (PPT), Sizing and scale upRÉSUMÉ La pratique en vigueur dans l’industrie concernant l’évaluation et le calibrage d’un cylindre de broyage à haute pression (HPGR, de l’anglais high-pressure grinding ...

HPGR comminution for optimization of copper leaching ...

High-pressure grinding rolls (HPGR) are an accepted, but continuously expanding, comminution technology. The copper industry has a growing need to process harder ores with progressively lower grades, more challenging metallurgy and increasing demand for efficient bacterial leaching applications. This has resulted in a major focus on HPGR use in a crushing circuit.

Comminution circuit design and simulation for the ...

The application of High Pressure Grinding Roll (HPGR) in comminution circuits is well established in processing cement, diamonds and iron ore. Recently, the application of HPGR has been extended to high-tonnage precious and base metals operations with hard ore. This is due to the HPGR: being more energy-efficient than grinding mills, not requiring steel grinding media, and providing higher ...

POLYCOM high-pressure grinding roll.

The required comminution pressure is transmitted via the floating roll. This method of high-pressure interparticle comminution produces compacted cakes of material contain-ing a high proportion of fines and coarser particles showing extensive cracking. Depending on the foreseen use of the product, the cakes can either simply be disagglomerated, or finish ground and fed to a separator. POLYCOM ...

HPGR comminution optimization copper leaching | …

The HPGR comminution resulted in 60% copper extraction in 25-30 days, while the conventionally comminuted material achieved 60% copper extraction after 50-55 days for this particular ore and crush size. This could have introduced acid savings of 2.5 kg/t (5 lb/st) had leaching been terminated at that point by, for example, using a dynamic, on-off-type leach pad. For a 90,718-t/day (100,000-std ...

Comparison of HPGR - ball mill and HPGR - stirred mill ...

In the past 20 years, the energy-efficient comminution technologies, including high pressure grinding rolls (HPGR) and high speed stirred mill, have been developed and adopted in the hard-rock mining operation in order to reduce the energy consumption and improve the process performance. The combination of HPGR and stirred mill in a single flowsheet without tumbling mills has been …

Determination of the nip zone angle in high-pressure ...

A proposal of the nip zone angle determination in high-pressure grinding rolls (HPGR) crush-ing process is presented in the paper. Knowledge of the nip zone angle value makes it possible to deter-mine the real maximum pressing force in the high-pressure comminution. Two methods of determination of this maximum pressure were proposed and verified. The first method is based on the roll’s ...

Redefining Deposit’s Reserves by Advanced Mineral ...

Just considering the comminution process in open circuit operation, these savings may reach up to 50 % using HPGR. In combination of the mill with an air classifier in a closed circuit, the savings may still reach 10–25 % (8). The exact savings value depends on a variety of influences such as ore strength, recycling rate of mill product (9) and the process parameters of the mills compared. A ...

assembly press roller hpgr grinding feed - BINQ Mining

In high-pressure grinding roller comminution the feed material is … The FL HPGR press incorporates roller skew control via the … roller assembly. Step 1: »More detailed. First choice for HPGR technology and service. grindability by HPGR grinding … depending on the properties of the feed material ** normal max specific press … Visual tour of a High Pressure Grinding Roller 6a. »More d

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