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What's the Difference Between SAG Mill and Ball Mill
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SAG Mill power draw models are used in mill design and grinding circuit modelling to predict how much power will be consumed by a particular mill geometry and operating …
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AN UPDATED DATA SET FOR SAG MILL POWER MODEL CALIBRATION *A. G. Doll SAGMILLING 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
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crushed ore is fed into a SAG/Ball mill circuit with a median size of approximately 12,000 microns. Most SAG Mills are operated in closed circuit with a screen. The screen fi lters undersized ore, normally minus ½ inch, to a ball mill …
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The comminution circuit of this plant includes one SAG mill in a closed circuit with a vibrating screen and one ball mill with a size classification system of h... Cite Download full-text
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Figure 3(a)—Pilot SAG mill Ecs vs. Ball Load, Reproduced from Morrell (2006a); (b) SAG Mill Ecs vs. Ball Load for 'Open-Circuit' SAG Mills in JKTech Database 0 2 4 6 8 10 12 14 16 18 20 0 2 4 6 8 10 12 14 SAG mill Ecs (kWh/t) Ball load (%) 0 5 10 15 20 SAG mill Ecs (kWh/t) Ball load (%) Coarse feed, uncrushed pebbles Very soft ores, Axb >80
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When operating a grinding circuit (at Granny Smith) under a wide range of conditions: campaigning very competent underground ore followed by soft oxide, primary versus secondary crushed feed and finally single-stage SAG and conventional SAG, ball mill and pebble crusher (SABC) configurations. Economics changed and a review of the …
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Figure 4: A*b vs SAG kWh/t for operating AG/SAG mills (after Veillette and Parker, 2005) Relationship to the DWi . The SCSE is the output in kWh/tonne from a simulation of a particular SAG mill circuit configuration using the variable rates model in JKSimMet, one of which inputs is the A and b value. The DWi is a
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A linkedin group was recently discussing this by asking: I've tried to estimate AG/SAG Mill power requirements using several different methods: (1) Using the results of SMC data (2) Using SAG Power Index (SPI) data (3) Using the 1989 Barratt method updated on Alex Doll's Web site (February 16, 2015) (3) Using Don Burgess' …
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to be used to predict the SAG mill circuit and ball mill circuit specific energies it is important to ascertain: 1. whether the transfer distributions obey the parallel conditions 2. what the appropriate T80 value should be for a given ore type, circuit configuration, mill geometry and operating condition 10 100 0.01 0.1 1 10 100 1000 size (mm)
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Based on experience, mill-liner designs have moved toward more open-shell lifter spacing, increased pulp lifter volumetric capacity, and a grate design to facilitate maximizing both pebble-crushing circuit utilization and SAG mill capacity. As a guideline, mill throughput is maximized with shell lifters between ratios of 2.5:1 and 5.0:1.
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The purpose of this paper is therefore to examine the use of SAGDesign technology as a valid method for determining the chamber size and power required for new AGB, SAB …
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SAG mill performance is sensitive to mill filling which influences the throughput capacity, power draw, and product grind from the circuit. Each of these performance parameters peak at different ...
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To determine if a SAG mill is operating within the generally established guidelines for a large diameter to length ratio SAG mill, the mill performance can be modeled mathematically. A generalized SAG mill power draw equation developed by Austin, is given by: where the parameters used in the model are defined as: mp= net …
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The SAG mill is 8.23m (27') diameter x 3.75m (12.3') long. The Holt-McDermott grinding circuit uses a large primary SAG mill which is 5.03m (16.5') diameter x 5.26m (17.25') long (grinding chamber). At the time of the test program the SAG mill was operating in open circuit (no classifier) to feed a small ball mill/cyclone circuit. Page ...
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Full Scale Test Circuit. Based upon the results of the pilot plant test work, a decision was made to conduct a full scale test in 1990 utilizing one of the ten (10) primary mill lines at the National Steel Pellet Plant. Primary Mill Line No. 10 would be converted to a fully autogenous grinding mill with pebble extraction and crushing.
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A SAG mill is used to grind and crush large pieces of rock into smaller pieces of rock, gravel, or dust. It is commonly used in the mining industry. Q2. How does a SAG mill work? A SAG mill uses a combination of impact and attrition to grind the material. The grinding media in a SAG mill are larger than in a ball mill, and there are fewer of ...
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A SAG (Semi-Autogenous Grinding) mill is a giant rotating cylinder filled with grinding media and the ore being reduced. As the mill rotates, the grinding media lifts and the impact crushes the feed material. SAG mill control refers to the practice of managing the mill load, which is the amount of material inside the mill at any given time.
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John Starkey, P. Eng. has worked in SAG mill hardness testing since 1964 where he worked as pilot plant engineer for A. MacPherson's projects. He invented the SPI and SAGDesign tests. The latter is now acknowledged by our clients to be a world-class method for grinding circuit design, and is accepted by our peers as a standard for ore ...
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An industrial example of its use is for the problem of SAG mill feed rate control, shown in Figure 12, which is notoriously difficult for a PID controller due to the long dead time. Figure 13 shows the results of on/off testing comparing Dahlin and PID control. Jean Rasczak. 9 years ago. Jean Rasczak 9 years ago.
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Opening the SAG mill circuit is thus an option for balancing the power distribution between primary and secondary grinding stages in the case of adopting the SABC circuit configuration for processing the Cristalino ore. The specific energy value (7.4 kWh/t) obtained of both SAG-5 and SAG-6 tests were interpreted as equivalent to an …
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Most empirical comminution models are calibrated to two-stage AG/SAG mill and ball mill circuits -- this work compares the performance of several commonly used power-based …
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Prior to embarking on the development of any type of high level control strategy, a series of tests is required to determine the nature of the relationships …
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Mill filling is an important operational parameter in a SAG mill circuit and by its control and optimisation it can produce significant improvements in production capacity and energy efficiency. However, it is industry practice to report mill load as the total output given by load cells, or kPa for systems based on lubrication bearing back pressure, rather than …
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The Kidston plant was designed to process 7500 tpd fresh ore of average hardness; but to optimise profit during the first two years of operation when softer oxide ore will be treated, the process equipment was sized to handle a throughput of up to 14 000 tpd. Some of the equipment, …
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The SAG mill–pebble crushing circuit closed configuration is referred to as SAC, while the opencircuit configuration is SAC-A. Twelve AG/SAG tests were conducted according to different configurations and …
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3.2 Mine-to-Mill The feed size to AG and SAG mill circuits has been demonstrated to have a significant impact on throughput with effects such a that illustrated in Figure 7, being commonplace. Modifying blast design and primary crusher operation can significantly influence AG/SAG mill feed size, hence giving a potentially cost effective way to
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performing SAG mill. It is possible in some cases to modify a SAG circuit to force it to perform better, but this often takes time, much effort and costly modifications. In most cases the capital spent on a properly sized SAG mill may prevent production losses that would be many times greater over the extended start up period.
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Learn how to choose a SAG mill to achieve design performance based on ore hardness variability and grinding efficiency. See examples of test work, pilot plant …
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grinding circuit that also takes into account non-ore related influences e.g., equipment size, speed, ball load tc. ... the "variable rates" AG/SAG mill model in JKSimMet is to be used (Morrell and Morrison,1996) the laboratory test has to generate an A and b value, or if a Bond equation is utilised the appropriate Bond ...
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