Not another HPGR trade-off study! | Mining, Metallurgy
Over the past several years, the combination of higher energy and steel costs and the recent commercial deployment of high-pressure grinding rolls (HPGR) technology in hard rock mining have led many multinational mining companies to evaluate the suitability of HPGR technology for their particular comminution circuits. HPGR …
HPGR
M. Bueno, B. Foggiatto, G. Lane SAG Conference Vancouver, Canada September 22 – 26, 2019 ABSTRACT This paper presents an assessment and trade-off …
Autogenous and Semi-Autogenous Mills
A typical SAG-HPGR-Ball mill circuit suggested by Patzelt et al. [6] is shown in Figure 9.6, where the pebbles from the SAG mill are crushed in the high-pressure grinding rolls. It is a general observation that SAG mills are helpful for grinding where wide variations in the grindability of ores are experienced.
SAG Conference 2023
Machine Learning-accelerated SAG Mill Optimization (P. Shelley) 11:15 11:30 Paper 10 Remote grinding mill operation – a key contributor to the low emission mining society (A. Fernandez) 11:15 11:30 Paper 10 RAPID Diagnostics and Observations of the Internal Operation of a SAG Mill in the Context of its Grinding Circuit. (R. Pax) …
INTERNATIONAL AUTOGENOUS GRINDING …
Grinding (AG) mills), or the combination of the two (Semi-Autogenous Grinding (SAG) mills) to fracture rock using the breakage mechanisms of impact and abrasion. The rotation of these large, cylindrical mills, coupled with the low probability of ball – particle collisions, results in a high demand for energy in the grinding process.
High Pressure Grinding Rolls (HPGR)
High Pressure Grinding Rolls (HPGR) In Comparison to SAG Milling Technology Presented by: Hassan Ghaffari, P.Eng. Raytcho Anguelov, P.Eng. ... 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 ...
Why HPGRs are revolutionising mill circuits |
Why HPGRs are revolutionising mill circuits. Chosen for their energy efficiency, long wear life and downstream advantages, High Pressure Grinding Rolls (HGPRs) are …
COMPARISON OF HPGR
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.
Potential of High-Pressure Grinding Roll (HPGR) for …
1970s, autogenous grinding mills (AG) and semiautoge-nous grinding mills (SAG) were largely used, and soon the comminution circuits with AG/SAG mills and ball mills became industrial standard flowsheets, due to their higher processing capacity [3]. But at the same time there was also a constant pursuit by the researchers to address the issue ...
ROCK CHARACTERISATION FOR HIGH PRESSURE …
ROCK CHARACTERISATION FOR HIGH PRESSURE GRINDING ROLLS CIRCUIT DESIGN By Stephen Morrell Director, SMCC Pty Ltd, Brisbane, Australia ... ball and ag/sag mills. This presents problems for High ...
Rock characterisation for high pressure grinding rolls circuit design
Much of the currently available rock characterisation tests have been developed specifically for rod, ball and ag/sag mills. This presents problems for High Pressure Grinding Rolls (HPGR) circuit ...
Why HPGRs are revolutionising mill circuits |
Despite having a significantly smaller footprint than conventional "tumbling" mills, HPGR's are high-capacity crushing units delivering a high degree of size reduction, resulting from sophisticated inter-particle grinding. High Pressure Grinding Rolls consist of two counter rotating, similar sized rolls, which synchronously operate at ...
COMPARISON OF HPGR
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 …
Conference
SAG 2023 will be the 8th International Conference on Semi-Autogenous Grinding & High Pressure Grinding Technology. Held at JW Marriott Parq Vancouver on the edge of False Creek in Vancouver, Canada. This Operators Conference started …
How HPGRs compare to conventional milling |
High Pressure Grinding Rolls (HPGR) In Comparison to SAG Milling Technology Presented by: Hassan Ghaffari, P.Eng. Raytcho Anguelov, P.Eng. ... Equipment 1 x …
SAG Conference 2023
Machine Learning-accelerated SAG Mill Optimization (Y. Mohammadi) 11:15 11:30 Paper 10 Remote grinding mill operation – a key contributor to the low emission mining society (D. Gallego Lobato) 11:15 11:30 Paper 10 RAPID Diagnostics and Observations of the Internal Operation of a SAG Mill in the Context of its Grinding …
Grinding Mills and Their Types
High pressure grinding rolls. The high pressure grinding rolls, often referred to as HPGRs or roller press, consists out of two rollers with the same dimensions, which are rotating against each other with …
Predicting the overall specific energy requirement of crushing, high
In a previous paper (Morrell, 2008a) an approach was described which enabled the specific energy of tumbling mills such as AG,SAG and ball mills to be estimated from laboratory-derived ore characterisation data. The following paper extends this approach to encompass jaw, gyratory and cone crushers as well as High Pressure …
Evaluating the performance of an industrial-scale high pressure
A comminution circuit of three-stage crushing and one-stage milling was adopted by configuring the tower mill after HPGR. As shown in Fig. 1, the primary crushing involves a C80 Jaw crusher comminuting the ROM ores from − 350 to − 70 mm for feeding the secondary crushing.In secondary crushing, a GP100M cone crusher is closed with a …
High Pressure Grinding Rolls (HPGR) in Comparision to 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 comparison to the SAG mill grinding technology. These studies were prepared by Wardrop Engineering Inc. on eight different projects at various magnitude tonnages.
Unifying high-pressure grinding rolls models
This paper unifies high-pressure grinding rolls crusher (HPGR) models of the working gap, mass flow rate, power draw, and centre and edge product particle size distribution models to produce a framework that allows the simulation of the equipment for process optimization and control studies.
G High pressure grinding roll for the mining industry
8 High Pressure Grinding Roll High Pressure Grinding Roll 9 Model No. Roll area Roll diameter Roll width Approximate throughput* Approximate top feed size S360 0.36 m² 0.90 m 0.40 m 120 MTPH 25 mm 1.0 in S900 0.90 m² 1.36 m 0.66 m 350 MTPH 35 mm 1.4 in ... The change from a SAG mill to an HPGR in primary grinding results in a lower overall ...
Technical Information
The SMC Test® is the most widely-used comminution test in the world for AG & SAG Mills, HPGRs and Crushers. ... Figure 3 – Measured vs Predicted Specific Energy for High Pressure Grinding Rolls. BACKGROUND. The SMC Test® is a precision test that uses either crushed rock pieces that are very closely sized (so-called crush and select method ...
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Improved characterisation of ball milling energy …
This paper describes a method for assessing the downstream milling energy requirements for high pressure grinding rolls (HPGR) products based on a Bond mill test procedure. Multiple trade-off studies have reported the performance of HPGR versus SAG milling with energy savings of between 11 and 32 per cent.
HPGR
M. 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.
A simple estimation method of materials handling …
Tradeoff studies of multistage crushing plants involving high pressure grinding rolls (HPGRs) versus semiautogenous grinding (SAG) mill circuits typically focus on the operating cost savings of crushing plants versus the capital cost savings of SAG mill plants. Very highlevel (or desktop)
Using the SMC Test revised
• High Pressure Grinding Rolls (HPGR) POWER-BASED EQUATIONS General The approach divides comminution equipment into three categories: • Tumbling mills, eg …
Helping to reduce mining industry carbon emissions: A step …
High Pressure Grinding Rolls (HPGR) have been found to be more energy efficient than tumbling mills such as AG/SAG and ball mills and, having been invented …
Autogenous Grinding Semiautogenous Grinding High Pressure Grinding
After the introduction of high compression grinding mills (High pressure grinding rolls (HPGR), vertical roller mill (VRM) and Horomill), various circuit configurations have been developed for ...