WEBOct 1, 2001 · The SAG mill was originally operating in a ball mill duty and it has a low aspect ratio (diameter/length) which changes its operation relative to typical high aspect mills (Powell, Morrell and ...
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WEBNov 2, 2017 · Similarly, in SAG milling, there is an optimum point for rock/ball filling, mill speed, and product size to achieve optimum throughput and specific energy consumption [46, 47]. However, operational strategies at many mine sites are based on a simple philosophy—maximizing installed power (such as running maximum HPGR force .
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WEBOct 20, 2015 · A 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)
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WEBJun 1, 2009 · Nowadays ball mills still dominate secondary grinding appliions, but are increasingly in competition with closed circuit AG/SAG mill circuits and stirred mills (NapierMunn et al., 1996). At product sizes finer than 80% passing 75 μm, the efficiency of ball mill grinding rapidly decreases.
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WEBJan 1, 2011 · Tracking the mill performance showed that the mill power consumption decreased from to kWh/t (a nearly 30% reduction), P80 of the mill product decreased from 611 to 355μm, and the mill ...
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WEBDec 18, 2013 · This quantity is small compared to the power used by a semiautogenous mill and a ball mill in a primary grinding circuit; a ball mill can have an installed power of up to 15 MW, while installed power for a SAG mill can go up to 25 MW. However, the energy used for fine grinding is still significant.
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WEBAll Model types: specific energy consumption models; SAG and ball mill circuit models Raw Bond/Barratt SAB SABC model; Optimized Bond/Barratt Models (including phantom cyclone allowance) ... Morrell Cmodel for SAG ball mills (phenomenological model with empirical fitting). Subdivided into:
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WEBShow details of benchmarking. Benchmarking: Bond/Barratt SAG Mill Specific Energy Consumption Detour Lake. J. TorrealbaVargas, J.F. Dupont, J. McMullen, A. Allaire and R. Welyhorsky, The successful development of the detour lake grinding circuit: from testwork to of the SAG 2015 Conference, September 2015, .
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WEBJan 17, 2017 · providing operating data for 3 semi autogenous grinding (SAG) mills and 4 ball mills. Results show on. average that 7 9% of the supplied electrical energy converts to heat absorbed by the slurry ...
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WEBIn contrast, the energy consumption provided by the Bond methodology was lower than the results obtained on a pilot scale for all routes studied. Use of pebble crushing led to a reduction of % in the SAG mill power consumption for the SAB/C route, without increase in power consumption in the ball mill.
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WEBThe phantom ball mill specific energy consumption can be calculated using Equation (4) si nce the BRWi > BBWi 10 | SAG CONFERENCE 2019 VANCOUVER | SEPTEMBER 22 – 26, 2019 With F 80 =13,200 µm ...
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WEBJan 1, 2009 · The central pebbles crushing plant grounds the pebbles generated by the two SAG mills; it has four cone crushers. These crushed pebbles are sent to the SAG 2 ball mill circuits. In the case of the SAG 1, when it is not possible to send pebbles to the central pebbles crushing plant, its own cone crushers are used and the product is returned to ...
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WEBJun 16, 2020 · Semiautogenous grinding mills play a critical role in the processing stage of many mining operations. They are also one of the most intensive energy consumers of the entire process. Current forecasting techniques of energy consumption base their inferences on feeding ore mineralogical features, SAG dimensions, and operational .
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WEBJan 1, 2001 · The Discrete Element Method (DEM) was introduced as an alternative way to model mills by Rajamani (1992, 1994) who simulated a ball mill and Rajamani and Mishra (1996) with simulations of a SAG ...
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WEBMay 28, 2018 · Bond's method is widely used for predicting the energy requirement of crushers, rod and ball mills, while a number of other methodologies have been proposed for AG/SAG mills.
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WEBJun 1, 2009 · Both ball mills and SAG mills are typical equipment for size reduction based on the tumbling methods and are widely used in the comminution circuit [15,16]. ... the energy consumption of ball ...
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WEBSep 20, 2015 · standard practice to install a SAG mill in the SABC (SAG, ball mill, crusher) configuration. ... SAG mill Specific energy kWh/t 7. 9 SAG mill volumetric filling % ...
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WEBApr 19, 2023 · Considering the continuous increase in production costs and resource optimization, more than a strategic objective has become imperative in the copper mining industry. In the search to improve the efficiency in the use of resources, the present work develops models of a semiautogenous grinding (SAG) mill using statistical analysis .
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WEBSep 11, 2020 · With our SAG mill running at % critical speed (mill RPM), the SER motor speed reference is 850 RPM or 85% of 1000 RPM. We are recovering approximately MW of slip energy; the power ...
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WEBApr 26, 2016 · The SMC and Bond ball work index experiments as well as the Morrell model indied that the order of the specific energy consumption of comminution was "Jaw crusher + HPGR mill + ball mill" < "Jaw crusher + ball mill"< "SAG mill + ball mill". Standard drop weight, SMC, and Bond ball work index tests have been conducted to ...
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WEBInstead of conventional AG/SAG and ball mills, processes only with highpressure grinding rolls (HPGR) and vertical mills (Fig. 5) or other combinations of mill types are employed in practice. Besides a pure grinding feed, a crucial aspect is the optimum energy utilization in beneficiation for the respective types of ore and appliions.
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WEBThe main drawback of SAG high power consumption. To reduce power consumption, I think: The right determine of SAG feed size. This depends on the mill diameter and the ball size. Feed size necessary to take 80% of the maximum piece of ore that will crushed by the balls. For the big SAG more than 8 meters optimal feed size will be 50mm.
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WEBFeb 1, 1994 · Abstract. A numerical tool known as the discrete element method (DEM) is used to study the motion of the ball charge in ball mills. In particular, the motion of individual balls in the ball charge is simulated. An interesting aspect of this simulation is that it yields the frequency distribution of ball collisions as a function of collision energy.
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WEBDec 30, 2023 · The ball loading of a SAG mill can be considered optimal if it provides a given finished grade capacity with consideration of minimum energy consumption. Insufficient ball filling most often leads to a decrease in the efficiency of operation on the output of the finished class, and its excess leads to an increase in the power .
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WEBSAG/Ball Mill Sizing Gross Power Draw and Specific Energy Calculator for SemiAutogenous Grinding (SAG) and Ball Mills. Return to Mill Calculators. ... Specific Energy Required: [kWh/t] Power Required: [kW] Mill Selection Result. Description. Value Units. Available Power Utilized: [%]
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WEBJul 2, 2020 · The use of highpressure grinding rolls (HPGR) prior to ball mills has become a common practice in cement clinker grinding due to significant energy savings in comparison to ball milling alone.
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WEBApr 19, 2023 · 2. Background. The SAG grinding process has been modeled by various authors, either generating explanatory models of the grinding process, with the aim of modeling, simulating, and optimizing the individual process, as well as integrating it into aggregate processes, such as the minetomill (M2M) paradigm, a practice that has .
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WEBMar 14, 2015 · Calculate a Mill's Operating Work Index. Use this online formula to calculate a Ball Mill, Rod Mill or SAG Mill Operating Work Index. Based on Fred Bond's work you can estimate the energy used into your grinding circuit. This is the most accurate and informative method, but much of the data necessary for its appliion is not yet .
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WEBOct 25, 2023 · Energy consumption represents a significant operating expense in the mining and minerals industry. Grinding accounts for more than half of the mining sector's total energy usage, where the semiautogenous grinding (SAG) circuits are one of the main components. The implementation of control and automation strategies that can achieve .
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