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  • Modelling SAG milling power and specific energy

    the mill power and the efficiency of the mill operation (Van Nierop and Moys, 2001). If a SAG mill has been designed with a conventional power or specific energy model which do not con-sider the projected feed size distribution it is likely that this mill will reach the expected power

  • Modelling SAG milling power and specific energy

    Jan 01, 2015· This distribution affects the SAG mill load and the load affects directly the mill power and the efficiency of the mill operation (Van Nierop and Moys, 2001). If a SAG mill has been designed with a conventional power or specific energy model which do not consider the projected feed size distribution it is likely that this mill will reach the

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  • Optimization of the Design of SAG Mill Internals Using

    Figure 7. Predicted power as a function of distance down the mill for complete mill simulation. The information contained in Figure 7 can in turn be used to accurately predict mill power (power predicted and power measured total are 16.9MW and 16.4-17.5MW respectively) and to estimate quite

  • AN UPDATED DATA SET FOR SAG MILL POWER MODEL

    AN UPDATED DATA SET FOR SAG MILL POWER MODEL CALIBRATION *A. G. Doll SAGMILLING.COM Logan Lake, Canada ABSTRACT This paper expands the SAG mill survey database published by the Author at Procemin 2013. The new database includes 49 published SAG/AG mill surveys and includes mills from all over the world. The

  • SAG Mill Power Model Grinding & Classification Circuits

    Which power model is the most efficient to predict the correct power consumption in sag mill with change in process variables?I have developed a few dynamic simulators for different mineral/metal processing plants. Prediction of correct sag mill power consumption with a change in ore hardness, solid

  • Orway Mineral Consultants Canada Ltd. Mississauga, ON

    The SAG Power Index (SPI) test (Starkey & Dobby, 1996) uses a benchscale SAG mill test to determine the specific energy of an industrial SAG mill. The test is operated in closed circuit and the time required to grind the material to a P 80 of 1.7 mm is used to predict AG/SAG

  • Modelling SAG milling power and specific energy

    In these circuits the SAG mill is the largest energy consumer. In many engineering projects either a power equation and/or a specific energy equation are used for the designing of these mills but not always with acceptable results.

  • Cited by: 16
  • GROSS POWER CALCULATOR SMC Testing

    predicted. Slurry pooling causes the power draw in AG and SAG mills to be lower than a mill without a slurry pool. This phenomenon results in overflow mills usually drawing less power than grate discharge mills that are operating without a slurry pool. This is because by definition overflow mills operate all of the time with a slurry pool.

  • Optimum SAG Mill Discharge Density Grinding

    Relation between Sag mill solid and product P80! Both are dependent on feed size. Dependent on Volume % solids in SAG mill. Dependent on ball charge volume. Hardness of ore. Recirculation load. Dependent on P80% size. All other parameters are secondary. In general Sag mill solids are kept at 70% by wt. Operating grinding circuit is an art.

  • Mill (grinding) Wikipedia

    SAG mills use a ball charge of 8 to 21%. The largest SAG mill is 42' (12.8m) in diameter, powered by a 28 MW (38,000 HP) motor. A SAG mill with a 44' (13.4m) diameter and a power of 35 MW (47,000 HP) has been designed. Attrition between grinding balls and ore particles causes grinding of finer particles. SAG mills are characterized by their

  • Throughput optimisation in milling circuits

    SAG Mill Power. SAG milling can be optimised to achieve maximum breakage and throughput (or any other number of objectives). The relationships between the key variables are highly non-linear and shift as the ore hardness, steel load and liner conditions change.

  • Mill Filling Prediction tool: a new soft sensor that

    Jul 29, 2020· SAG mills are a key asset for mineral processing operations as one of the critical stages of extracting mineral out of ore, and their continued stable operation is central to productivity.

  • Grinding Optimization Fruitful Outotec

    Grinding is therefore considered a very beneficial target for optimization. It is critical in achieving a suitable ore feed size distribution in order to reach high grinding efficiency and throughput, especially in grinding circuits involving autogenous (AG) or semi-autogenous (SAG) mills.

  • TECHNICAL NOTES 8 GRINDING R. P. King

    mill is the energy consumption. The power supplied to the mill is used primarily to lift the load (medium and charge). Additional power is required to keep the mill rotating. 8.1.3 Power drawn by ball, semi-autogenous and autogenous mills A simplified picture of the mill load is shown in Figure 8.3 Ad this can be used to establish the essential

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  • Mineral Processing SlideShare

    May 15, 2014· SAG mills are primarily used at gold, copper and platinum mines with applications also in the lead, zinc, silver, alumina and nickel industries. The largest SAG mill is 42' in diameter, powered by a 28 MW (38,000 HP) motor AUTOGENOUS GRINDING MILL SAG . They are so-called due to the self-grinding of the ore.

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  • Corani ,Bear Creek Mining Corporation

    Corani is well-situated in a mining-compatible jurisdiction, near road and power infrastructure and in a sparsely populated region. Corani has sizeable Proven and Probable Reserves that will support average annual payable metal production of 9.6 M oz of silver, 98 M

  • Bond Tests SGS

    Bond Rod Mill Grindability Test. The test determines the Bond Rod Mill Work Index which is used with Bond’s Third Theory of Comminution to calculate net power requirements when sizing ball mills*. Various correction factors may have to be applied. The test is a closed-circuit dry grindability test performed in a standard rod mill.

  • High Pressure Grinding Rolls (HPGR) SGS

    The total power for the HPGR system can be compared to that of a conventional circuit, based on the rod and ball mill work indices and the Third Theory of comminution. The power comparison can also be done against AG/SAG mills. This methodology has only been used to scope the potential energy savings of HPGR at small scales.

  • Craig Brown Principal Consultant Resources Engineering

    Feb 27, 2013· Developments of the JK SAG Mill Model and Simulation Applications 2013 SME Annual Meeting & Exhibit February 27, 2013 Recent work has incorporated improvements to the JK SAG mill model based on a power-based model that directly relates the

  • Title: Minerals industry consultant
  • Grinding Circuit Design for Adanac Moly SGS

    to include SAG and Ball milling. The hardness of each sample was measured in terms of SAG power index, SPI (for SAG grinding) and Bond Ball mill work index, BWi (for ball mill grinding). A further measure, the Minnovex crusher index, Ci was also measured for use in the CEET program to determine SAG mill feed size (Kosick and Bennett, 2001).

  • SAGMILLING.COM .:. Articles

    An updated data set for sag mill power model calibration This paper expands the SAG mill survey database published by the Author at Procemin 2013. The new database includes 49 published SAG/AG mill surveys and includes mills from all over the world.

  • MacPherson Autogenous Grindability Test SGS

    The mill power draw, throughput and product size distribution are used to compute a specific energy input and the MacPherson autogenous work index (AWI). Although the importance to achieve steady-state in a grinding test is widely accepted (Bond tests), the MacPherson test remains the only small-scale AG/SAG mill test that offers this option.

  • Gearless mill drives ABB

    • 28 MW GMD for a 40' SAG mill • 28 MW GMD for 42' SAG mill Whether it is size or an installation at the highest altitude (4600 m.a.s.l.), ABB’s GMDs are well positioned to contribute to the building of larger and ever more powerful mills. — Leading the gearless mill drive evolution The ABB gearless mill drive (GMD) is the most powerful

  • SAG Calculator Edmund Optics

    We have set your country/region to United States. You can change this selection at any time, but products in your cart, saved lists, or quote may be removed if they

  • Comparison of DEM and experiment for a scale model SAG mill

    Jan 01, 2003· Predictions of flow patterns in a 600-mm scale model SAG mill made using four classes of discrete element method (DEM) models are compared to experimental photographs. The omission of liner effects and errors in the estimation of the no-load power draw for such a small diameter mill mean that the Morrell power can only be used as a

  • Mineral Processing Design and Operations ScienceDirect

    The designs of autogenous and semi-autogenous (SAG) grindings mills are described followed by the description of their methods of operation in grinding circuits involving crushers and ball mills. Methods of estimating SAG mill volumes, mill charges, feed size and power consumptions and optimum speeds of rotation during operation are described.

  • USING THE SMC TEST® TO PREDICT COMMINUTION

    For tumbling mills the specific comminution energy (Wi) relates to the power at the pinion or for gearless drives the motor output. For HPGRs it is the energy inputted to the rolls, whilst for conventional crushers Wi relates to the specific energy as determined using the motor input power less the no-load power.

  • Roxgold lays Séguéla groundwork with Fruitful Outotec

    Mar 25, 2021· At the same time as selecting Fruitful Outotec for the SAG mill contract, Roxgold has awarded preferred contractor status to Lycopodium Minerals Pty Ltd and is currently negotiating the engineering, procurement, and construction (EPC) agreement with the company for the 1.25 Mt/y carbon-in-leach processing facility and other supporting

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  • The Axora take on crushing and International Mining

    Mar 26, 2021· Once a mill is built, changing the equipment, upgrading, etc is very hard and time consuming. The logistics of getting a new SAG mill to site, for example, are mind boggling. New technology will always come for new sites, but most of the world’s mining capacity is already in place. I would expect most digitalisation to focus on two areas:

  • Mineral Processing SlideShare

    May 15, 2014· SAG mills are primarily used at gold, copper and platinum mines with applications also in the lead, zinc, silver, alumina and nickel industries. The largest SAG mill is 42' in diameter, powered by a 28 MW (38,000 HP) motor AUTOGENOUS GRINDING MILL SAG . They are so-called due to the self-grinding of the ore.

  • Fruitful global website Fruitful

    Fruitful Flow Control has become a separately listed independent company called Neles. Neles is a flow control solutions and services provider for oil and gas refining, pulp, paper and the bioproducts industry, chemicals, and other process industries.

  • An energy benchmarking model for mineral comminution

    Oct 15, 2014· Fig. A2 shows the size distributions resulting from sampling of SAG mill feed and ball mill circuit product material streams. Looking at Fig. A2 and Table A1, it can be seen that a total of 19.15 kW h/t was used to reduce the P80 size of SAG mill feed from 51.0 mm to 158 μm.