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(PDF) Improved characterisation of ball milling energy

The Bond test can overestimate the reduction in ball milling energy requirements for HPGR products, not due to a change in the breakage characteristics of the particles, but because the Bond test

COMPARISON OF HPGR BALL MILL AND HPGR

2017-5-26  Specific energy requirements for the proposed HPGR ball mill circuit and HPGR stirred mill circuit were determined from a pilot-scale HPGR and stirred mill test, in association with a JK SimMet® simulation. Results obtained from the research showed that the HPGR ball

Energy and Cost Comparisons of HPGR-based Circuits

2020-4-8  The results showed that the HPGR-ball mill circuit achieved a 21% reduction in energy consumption over the existing SAG-ball mill circuit at the same P80 grind size of 160 mircons (μm). At a grind of 80% passing 75 μm, the HPGR-stirred mill circuit showed a 34% reduction in

How energy efficient is HPGR? ceecthefuture

2018-2-20  Typical energy savings of 10–20% can be expected when installing HPGR vs. a SAG mill. Wipf (2005) showed why conventional Bond Work index tests on HPGR product is likely to under-estimate the energy savings that can be achieved by installing HPGR. Energy efficiency of HPGR is, however, ore-specific. The biggest energy savings of HPGR tested

APPENDIX A. USE OF THE Mia, Mib, Mih, Mic IN

2016-7-13  energy for ball milling is the same as the difference in specific energy between open and closed crushing to reach the nominated ball mill feed size. This assumes that a crusher would provide this energy. However, in this situation the ball mill has to supply this energy and it has a different (higher) work index than the crusher (ie the

How HPGRs compare to conventional milling

Within comminution circuits, High Pressure Grinding Rolls (HPGR) are increasingly replacing conventional SAG, rod and ball mills for hard rock reduction owing to their substantially lower energy consumption and potential for significant total cost of

How energy efficient is HPGR? SAIMM

2009-11-20  Typical energy savings of 10–20% can be expected when installing HPGR vs. a SAG mill. Wipf (2005) showed why conventional Bond Work index tests on HPGR product is likely to under-estimate the energy savings that can be achieved by installing HPGR. Energy efficiency of HPGR is, however, ore-specific. The biggest energy savings of HPGR tested

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.

HIGH PRESSURE GRINDING ROLLS—A PROMISING AND

2016-1-10  HPGR should be compared with SAG mills in each individual case. Energy consumed in medium crushing, HPGR grinding and ball milling can be 40% lower as against SAG milling, which allows reduction of cost by more than USD 1 per ton for some types of ore. As a rule, HPGR is more advantageous for harder ore.

High Pressure Grinding Rolls (HPGR) TAKRAF GmbH

Cost and energy efficiency Grinding of material in HPGRs has proven to be more cost efficient as compared to conventional mills and crushers. Especially downstream processing stages such as ball-milling are more energy-efficient with an HPGR due to the finer product size distribution coming out and the additional effect of micro cracks within

Predicting SAG/AG Mill and HPGR Specific Energy

2016-7-13  specific energy (Ecs). The equation used for describing the relationship between the t 10 and Ecs is given below. t 10 = A ( 1 e -b.Ecs ) (1) The specific comminution energy (Ecs) has the units kWh/t and is the energy applied during impact breakage. As the impact energy is varied, so does the t 10. Higher impact energies produce higher values

Predicting HPGR performance and understanding rock

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 analyze the particle behavior in

Enduron® HPGR

As the energy required to reduce each tonne increases, HPGR offers miners an effective way to increase production while keeping energy costs under control to maintain profitability. How HPGR improves gold recovery. There are two main ways mines recover gold ore from the

Energy Efficiency SMC Testing

2021-3-12  However the energy efficiency of comminution circuits also varies depending on the flowhseet design of the circuit. So for example it is generally recognised that a crush-HPGR-ball mill circuit is more energy efficient than, say, one comprising crush-sag mill-ball-mill (Morrell,2008 2). At the design stage, therefore, there is an oportunity to

SPECIFIC COMMINUTION ENERGY SMC Testing

2020-3-24  Semi-autogenous (SAG), rod and ball mills. As well as the total specific energy it will also predict the specific energy of the crushing section, the HPGR section and the tumbling mill section separately. Hence, for example, in the case of an SABC circuit the total specific energy of the entire

Morrison Project British Columbia, Canada for Pacific

2010-5-7  L:\Projects\00_Minerals\2220 Mining Projects\02 HPGR and Ball Mill Projects\7959-Morrison\TESTS\HPGR Test Report Morrison Pacific Booker 1.doc 6 / 20 3.3 Specific Energy

High pressure grinding rolls (HPGR) applications_百度文库

2014-9-28  Applications of HPGR in di?erent circuit alternatives have resulted in 10–50% energy savings when compared with closed circuit ball milling operations (Patzelt, 1992). Nevertheless, due to the microcracks created by very high compression forces in the particle bed, the Bond work index of the material is further reduced for subsequent grinding operations (Bleifuss et al., 1997; Benzer et al

Predicting HPGR performance and understanding rock

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 analyze the particle behavior in

HIGH PRESSURE GRINDING ROLLS—A PROMISING AND

2016-1-10  HPGR should be compared with SAG mills in each individual case. Energy consumed in medium crushing, HPGR grinding and ball milling can be 40% lower as against SAG milling, which allows reduction of cost by more than USD 1 per ton for some types of ore. As a rule, HPGR is more advantageous for harder ore.

High Pressure Grinding Roller (HPGR) Dorr

HPGR High Pressure Grinding Roll for the minerals industry Global Installations • Canada • Saudi Arabia • Turkey 2 • United Kingdom HPGR equipment is a modern energy

Model:Bond HPGR and ball mill SAGMILLING.COM

2020-3-22  Es calibration factor : set to the reduction in ball mill operation work index observed in the HPGR test (typically -0.05 to -0.10 for a 5% to 10% reduction). HPGR crusher model mechanical efficiency : adjust until the E crush matches the HPGR test specific energy. Typical number is 0.3 (suggesting 30% energy is consumed in breakage).

Energy Efficiency SMC Testing

2021-3-12  However the energy efficiency of comminution circuits also varies depending on the flowhseet design of the circuit. So for example it is generally recognised that a crush-HPGR-ball mill circuit is more energy efficient than, say, one comprising crush-sag mill-ball-mill (Morrell,2008 2). At the design stage, therefore, there is an oportunity to

Developments in HPGR technology Mining Magazine

Reported power savings are in the range of 15-25% for hard, competent ores when compared with traditional semi-autogenous grinding (SAG)/ball mill, or stage crushing/ball mill circuits. Future applications may feature even finer screen sizes to enhance the energy efficiency of such a circuit.

EdRockMan HPGR's & Mill Circuits EdRockMan IV LLC

HPGR Vs. Crushing Vs. Ball Milling. d) To SAG or not to SAG e) Worked example Total circuit specific energy, which circuit is best for me? f) Key factors to select Unitary Ball Mill versus SAG / Ball Mill Circuit g) Flow Criteria / Retention as Design Limit for large Mills

Morrison Project British Columbia, Canada for Pacific

2010-5-7  L:\Projects\00_Minerals\2220 Mining Projects\02 HPGR and Ball Mill Projects\7959-Morrison\TESTS\HPGR Test Report Morrison Pacific Booker 1.doc 6 / 20 3.3 Specific Energy

SPECIFIC COMMINUTION ENERGY SMC Testing

2020-3-24  Semi-autogenous (SAG), rod and ball mills. As well as the total specific energy it will also predict the specific energy of the crushing section, the HPGR section and the tumbling mill section separately. Hence, for example, in the case of an SABC circuit the total specific energy of the entire