Single stage SAG Mills are very beneficial in reducing CAPEX for plants with a staged throughput approach. When future tonnage is to be increased, the SAG Mill can feed downstream ball milling to boost capacity. Fuller-Traylor SAG/AG Mills range in size from 4.3m through 12.2m in diameter with powers as high as 28,000 kW.
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SAG Mill Circuit Sampling. Many mills have been built based on data from inadequate sampling or from insufficient tests. With the cost of many mills …
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Gearless mill drive (GMD) technology has further expanded the use of large AG milling allowing Outotec to produce the world's largest SAG mill of 42' in diameter drawing power at 28 MW. Today, Outotec is the world leading supplier of gearless AG mills operating globally.
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Commissioning of the Cadia Hill SAG mill Circuit followed a project Research and Development exercise in July 1998. The SAG mill quickly reached 90% of the design rate but it became evident that the mill would not meet design throughput at the design operating conditions of ball and rock charge, mill speed and power draw.
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The results of these studies showed that a single line 40 ft SAG mill circuit gave the best project economics. Further work was followed up to optimize the 40 ft SAG mill size with the results showing that a slightly more expensive 42 ft SAG mill with equivalent power to the 40 ft SAG mill enhanced the
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circuit, which improved screen performance and thus increased throughput and reduced circulation load. ... Figures 8 and 9 on the right show results from a gold plant's SAG mill achieved with MillStar's Segregated Ore Feed Controller combined with the Power Optimiser: • The standard deviation of the mill feed control is greatly
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Where the SAG mill/ball mill circuit is the bottleneck in the processing plant the pebble circuit can be a significant factor in limiting overall plant capacity. The pebble circuit recirculating load can be very significant (depending on the ore characteristics and SAG mill operating dynamics).
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This, in turn, contributes to lower capital and maintenance costs for a SAG mill circuit. Versatile applications SAG milling extends itself to many applications due to the range of mill sizes available. They can accomplish the same size reduction work as two or three stages of crushing and screening, a rod mill and some or all of the work done ...
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AG/SAG mill based circuits and this has impacted on the ability of companies to obtain funding. Bailey et al. (2009) published guidelines on the use of typical SAG mill-based circuit design methods, with particular focus on the use (and misuse) of JKSimMet. A follow up paper by Lane et al. in
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Single stage SAG Mills are very beneficial in reducing CAPEX for plants with a staged throughput approach. When future tonnage is to be increased, the SAG Mill can feed downstream ball milling to boost capacity. Fuller-Traylor SAG/AG Mills range in size from 4.3m through 12.2m in diameter with powers as high as 28,000 kW.
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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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The range of mill sizes and versatile applications allow SAG milling to be accomplished with fewer lines than conventional set-ups. This, in turn, contributes to lower capital and maintenance costs for a SAG mill circuit. Versatile applications . SAG milling extends itself to many applications due to the range of mill sizes available.
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Inventory ID: 6C-HM03. UNUSED FL 36' x 24' (11m x 7.3m) Dual Pinion SAG Mill with 2 ABB 9,000 kW (12,069 HP) Motors for Total Power of 18,000 kW (24,138 HP)
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SAG mill. SAG is an acronym for semi-autogenous grinding. SAG mills are autogenous mills that also use grinding balls like a ball mill. A SAG mill is usually a primary or first stage grinder. SAG mills use a ball charge of 8 to 21%. The largest SAG mill is 42' (12.8m) in diameter, powered by a …
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operation of sag mill - lebhvbe. SAG 2011 paper #144 SlideShare sag 2011 paper #144 1 1 an overview of the design, construction, commissioning and early years of operation of the sag/ball mill grinding circuit at phu kham copper, gold operation in laos [7/27 Online] sag mill ball mill operations - …
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ABC closed circuit, Autogenous-Ball-Mill-Crusher. Another similar technique is the ABC open circuit where the crusher product feeds the ball mill rather than the autogenous mill. Crusher product is typical feed to a ball mill using large diameter balls but not much grinding of 20-25 mm ore can be accomplished in an autogenous mill.
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Each milling circuit is unique, and as such the goals and most optimal control strategy might differ for individual cases. Process IQ is an expert in implementing control systems for SAG and Ball milling circuits, making use of advanced stabilisation and optimisation strategies developed by Mintek.
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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% …
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Further, the SAG mill circuit was characterized by fluctuating feed size of between x. F, 80 =102 to 185 mm. A need for control of the feed size as well as blending ratios was recommended for an efficient operation in terms of throughput and final product size. This could be …
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SAG Mill Circuit Example — Gold Processing SAG mill circuit example for gold processing [image: (135-6-3)] AG/SAG Mill. AG/SAG mills are normally used to grind run-off-mine ore or primary crusher product. Wet grinding in an AG/SAG mill is accomplished in a slurry of 50 to 80 percent solids. 2D and 3D simulations of particles in a SAG Mill
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Following a successful commissioning and start-up, we believe that two grinding lines at Las Bambas, Perú, each consisting of one SAG Mill and one Ball Mill (this mill combination is uniquely specific to Las Bambas ore types), are operating at design throughput of close to 140,000 tpd and within the range predicted by DJB from a managed multi-sample geometallurgical testing program (i.e., no ...
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This SAG mill is working in combination with a tower mill as a secondary grinding stage. Yes, there is no ball mills in that grinding circuit. The p80 to the SAG mill was at about 6" while its product (flotation feed) was at 40 microns.
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It includes single stage jaw crushing with reclaim from a live stockpile and open circuit SAG mill, feeding cyclones that in turn operate in a closed circuit with a ball mill.. The process will include a conventional single-line SAG mill circuit (Semi-Autogenous Ball Mill Crushing, or SABC) followed by conventional flotation to produce concentrate for sale.
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Figure 1 - Overview grinding circuit The Copper Mountain SAG mill is 10363 mm [34 feet] in diameter and 6096 mm [20 feet] long. It is a grate discharge mill with an inside diameter of 10363 mm [34 feet] and a grinding length of 5334 mm [17.5 feet]. The mill is driven by two 8,500 horsepower ABB motors. Figure 2 - The 34' x 20' SAG mill
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The biggest characteristic of the sag mill is that the crushing ratio is large. The particle size of the materials to be ground is 300 ~ 400mm, sometimes even larger, and the minimum particle size of the materials to be discharged can reach 0.1 mm. The calculation shows that the crushing ratio can reach 3000 ~ 4000, while the ball mill's ...
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In multi-stage ABC/SABC circuits, the AG or SAG mills are in closed circuit with screens and pebble crushers. The mill discharge from these mills consists of slurry, which goes to the ball mills for further grinding, and coarse pebbles/rocks, which are crushed and sent back to the mill.
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Circuit surveys reported a SAG specific energy of 8.6 kWh/t and ball mill specific energy at 8.0 kWh/t (Dunne et al, 1999 Hart et al, 2001). The T 80 was not given so this was back-calculated to ...
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and Graham Bonn, Dynamic modelling of a SAG mill – pebble crusher circuit by data-driven methods, presented in proceedings of SAG conference 2019, Vancouver, September 2019. Paper D. Li, Haijie, Magnus Evertsson, Mats Lindqvist and Gauti Asbjörnsson, A data-driven method to isolate the effect of pebble recycling on AG/SAG mill circuit. To
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The SAG/Ball Mill Circuit has an overall processing capacity of 2300 TPD. A 20.0 ft x 7.5 ft, 1500 HP fixed speed SAG Mill is fed with ore coming from four feeders.
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In the previous scenario, a constant feed rate to the circuit was given. Considering the SAG mill hold up level, a new scenario was presented in this section. A controller was implemented between SAG mill and feeder, so the SAG mill hold-up was controlled below a certain level i.e. a constant mill charge.
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Ball mill Operating strategy when circuit is SAG-limited (note, fixed speed ball mills can only be vary P 80) Optional parameters. Description and Comment are optional text fields; Maximum t/h limit is a t/h throughput above which a warning message is displayed (but does not actually limit the throughput).
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The single-stage SAG mill circuit was shown to efficient operate ly on primary crushed, Wallaby Deeps underground material. With relatively coarse, competent feed and a reasonable ball charge, the variable speed SAG mill generated a product with sufficient fines content that the cyclones could manage without excessive recycle.
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SAG Mill Grinding Circuit Design SAG Mill Design and Specification The Kidston plant was designed to process 7500 tpd fresh ore of average hardness; but to optimise profit during the first SAG Mill Liner Design Mineral Processing, Based on experience, millliner designs have moved toward more openshell lifter spacing, increased pulp lifter volumetric capacity, and a grate design to facilitate ...
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When future tonnage is to be increased, the SAG Mill can feed downstream ball milling to boost capacity. Amstar SAG/AG Mills range in size from 4.3m through 12.2m in diameter with powers as high as 28,000 kW. Our team of product engineers continually improves SAG/AG Mill designs in order to provide the most robust, safe, and efficient grinding ...
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5|P age VANCOUVER 2015 Figure 2 - Open circuit of SAG mill regrinding The design details and results achieved with the circuit opening can be seen at Rosa et al. (2007). Such changes led to an approximate 50 tons/hour increase in the SAG feeding rate in 2007, with significantly higher uptime because of a great reduction in the number of liner ...
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(MPC) is described for a SAG mill circuit in a bauxite processing refinery at Wagerup, Australia (Refs: Gopinath, Mathur et al, 1995 and Le Page, Freeman et al 1996, Luse, Mathur et al 1997). The MPC controller presented in this paper is perhaps the first successful implementation of MPC for ball mills
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Dec 02, 2016 circuit is shown in Figure1. It is commonly referred to as a SABC circuit, for Semi-Autogenous Ball mill Crusher SABC. This circuit shows a semi-autogenous grinding SAGball mill circuit where both grinding mills are in closed circuit, with the SAG mill closed with a crusher to control the amount of critical size material in the ...
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AG & SAG Mill Grinding Circuit Automatic Control. It is obviously well understood that autogenous AG and semi-autogenous SAG mills operate quite differently from conventional rod mill or ball mills. Since these mills are of a grate discharge type, they operate with varying loads, with the power drawn by the mill being dependent upon the ...
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AG/SAG mill and crusher circuit simulations through the use of JKSimMet. Independent of this it can be used in power-based calculations, which in conjunction with the Bond ball work index test, enable the prediction of the specific energy of comminution circuits
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considered, such as a primary SAG and secondary ball mill circuit where the individual stages would be ESAG and Eball, and the combined total circuit CEE would be Etotal. In all cases, the specific energy consumption is defined as the motor power consumed relative to the shell of the mill (a.k.a.
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