high aspect sag mill
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high aspect sag mill

SAG Mill Grinding Circuit Design - 911metallurgist

06/06/2016  This refers to high-aspect AG/SAG mills. Ball Charge Motion inside a SAG Mill. With a higher density mill charge. SAG mills have a higher installed power density for a given plant footprint relative to AC mills. With the combination of finer grind and a lower installed power density (based on the lower density of the mill charge), a typical AG mill has a lower throughput, a lower power draw, and

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Semi-autogenous grinding (SAG) mill liner design and ...

ratio of around two. With this high aspect ratio, SAG mills generate both thrown and cascading ball-milling actions with shell linings shaped to lift and to throw alloy steel grinding balls of up to 150 mm (6 in.) in diameter. These actions apply crushing, attrition and abrasion comminu-tion processes to reduce primary-crushed ores down to

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Autogenous and Semi-Autogenous Mills - ScienceDirect

01/01/2016  A high aspect SAG mill had an ID of 6.0 m and the length measured 4.0 m along the central line. The mill was charged with ore having an S.G. of 2.65 and the load was 40% of the mill volume. The grinding media steel balls occupied 12.2% of the mill volume. The mill was rotated at 75% of its critical speed, which was 12.9 rpm. Estimate

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(Get Answer) - A high aspect SAG mill had an ID of 6.0 m ...

A high aspect SAG mill had an ID of 6.0 m and the length measured 4.0 m along the central line. The mill was charged with ore having an S.G. of 2.65 and the load was 40% of the mill volume. The grinding media steel balls occupied 12.2% of the mill volume. The mill was rotated at 75% of its critical speed, which was 12.9 rpm. Estimate

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Autogenous and Semi-Autogenous Mills FLSmidth

SAG and AG Mills operate by lifting ore/grinding media and dropping it on the operating bed of the mill charge. High impacts from lifting ore and media promote impact breakage which is the primary mechanism for size reduction in the mill. Via the use of sophisticated instruments and software, we closely monitor the mill impact location to boost the grinding efficiency of your operation. The ...

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SAG Milling in Australia -Revised Submission

MW). It has been the industry standard for SAG mills above 13 MW capacity. However, pinion systems to 8 MW per pinion and dual motor systems with quadruple pinions extend the range of gear driven mills to a theoretical limit of 32 MW. The Ernest Henry SAG mill (11 MW) is currently the largest twin pinion single drive mill installed in Australia.

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What's the Difference Between SAG Mill and Ball Mill ...

26/11/2019  Based on the high throughput and coarse grind, AG mills produce coarse grinds often classify mill discharge with screens and trommel. SAG mills grinding media includes some large and hard rocks, filled rate of 9% – 20%. SAG mill grind ores through impact, attrition, abrasion forces. In practice, for a given ore and equal processing conditions, the AG milling has a finer grind than SAG mills.

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SAG Mill Optimization using Model Predictive Control

exhibits many of these aspects. Maintaining the SAG mill weight at the optimum value is critical for achieving maximum grind rate efficiency and mill production (Powell, M.S., van der Westhuizen, A.P., Mainza, A.N. 2009). However, SAG mill weight is difficult to control as the dynamic response changes as the mill approaches maximum capacity. Near maximum capacity, the weight response ...

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SAG Milling in Australia -Revised Submission

normally associated with high aspect mills. In parallel with increases in mill size has been the development of larger pumps and higher- efficiency cyclones. Ball mill suppliers have adopted the same technologies to move beyond the traditional limit of 7500 kW. Increasingly, liner systems have become the critical components in the mill. Developments reviewed here include • Use of DEM and CFD ...

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(Get Answer) - A high aspect SAG mill had an ID of 6.0 m ...

A high aspect SAG mill had an ID of 6.0 m and the length measured 4.0 m along the central line. The mill was charged with ore having an S.G. of 2.65 and the load was 40% of the mill volume. The grinding media steel balls occupied 12.2% of the mill volume. The mill was rotated at 75% of its critical...

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SAG Mill Optimization using Model Predictive Control

exhibits many of these aspects. Maintaining the SAG mill weight at the optimum value is critical for achieving maximum grind rate efficiency and mill production (Powell, M.S., van der Westhuizen, A.P., Mainza, A.N. 2009). However, SAG mill weight is difficult to control as the dynamic response changes as the mill approaches maximum capacity. Near maximum capacity, the weight response ...

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Breakage - an overview ScienceDirect Topics

High aspect ratio AG/SAG mill with grating and conical ends. Fig. 9.2. Square AG/SAG mill with grating. Some dry autogenous mills operating in Canada are 8.5 m in diameter and 1.5 m in length. These are known as Aerofall mills. The Cadia Hill (Australia) wet SAG mill is 12.2 m in diameter with a 20 MW motor and in 2004 was the largest diameter mill in operation in the world. Mill sizes up to ...

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AN OVERVIEW OF SINGLE STAGE AUTOGENOUS AND SEMIAUTOGENOUS ...

3 SAG mill (8 – 15% ball charge) Variable competency ore 4 High ball charge SAG mill (15 to 25% ball charge) Incompetent ore 5 Low ball charge SAG mill, high mill speed. (4% ball charge, 90% Nc) A cross between AG and SAG for competent, abrasive ores. As typically operated in RSA. 6 SAG mill (configurations 3, and 5 ) with recycle crusher

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Major Mines Projects Aurora Mine

The SAG mill is a grate discharge high aspect ratio design, having 5,500 kW installed power with a variable speed drive. Grinding media is loaded into a front end loader for tipping into the refeed bin. Processing. Gravity separation; Centrifugal concentrator; Intensive Cyanidation Reactor (ICR) ACACIA reactor ; Carbon re-activation kiln; Dewatering; Smelting; Concentrate leach; Agitated tank ...

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Difference Between Sag Mill vs Ball Mill - mech4study

12/10/2017  SAG mill make use of steel balls included with some large and hard rocks for grinding. These mills utilize the balls in making the large fragments of materials broken into pieces. The ball charge of a SAG mill is about 9% to 20%.This process takes place inside the large rotating drum of SAG mill which is filled with balls partially. Interior of the drum uses the lifting plates. These plates ...

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SAG Mill - Mining engineering - Eng-Tips

01/06/2005  Having been in a few process plants with SAG mills they are inefficient- as low as 1% - since power costs are becoming a big issue there is lots of research being done ( try googling under SAG Mill efficiency) -technically I wouldn't consider them a 'crusher'- they are grinding mills and some mill people might take offence- note that SAG mills are high compared to length-this is so the ...

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Adriatic Metals plc Pre-Feasibility Study Metallurgy and ...

15/10/2020  The SAG mill will be a single pinion low aspect mill, operating in a closed circuit. The mill has an inside diameter of 3.8m and an effective grinding length (EGL) of 5.0m. The mill receives coarse ore and process water at a variable flowrate to achieve the correct pulp density. Lime and zinc sulphate are also dosed to the SAG mill to condition the feed prior to flotation. The SAG mill will be ...

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Mill (grinding) - Wikipedia

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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SAG Mill Optimization using Model Predictive Control

exhibits many of these aspects. Maintaining the SAG mill weight at the optimum value is critical for achieving maximum grind rate efficiency and mill production (Powell, M.S., van der Westhuizen, A.P., Mainza, A.N. 2009). However, SAG mill weight is difficult to control as the dynamic response changes as the mill approaches maximum capacity. Near maximum capacity, the weight response ...

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How SAG Mills Work Their Magic

How Do SAG Mills Work: The main purpose of SAG mills is to handle the grinding aspect by either preparing it so the material can proceed to be further ground or come up with a finished product after going through this stage. If you think crushing and screening can be a good alternative for this mill you are wrong for sure. It is actually worth ...

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Metso to Build Largest SAG Mill for Newmont’s Minas

It is situated near the Newmont Yanacocha gold mine, where Metso installed what was then the world’s largest single-stage SAG mill, a 32 x 32-ft (9.75 x 9.75-m) EGL mill, driven by a 16.5-MW ABB gearless motor, in 2008. That mill design was also the first of its kind and was customized for Newmont. According to Metso, it began commercial production within one month of its start-up—another ...

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Effect of rock shape representation in DEM on flow and ...

01/02/2019  The high mill aspect ratio means that much of the dynamic weight of the charge is actually transferred to the end walls rather than to the mill shell through the main charge. This means that the charge is axially compressed which strengthens it and makes slope failure and flow more difficult leading to a higher shoulder angle. One of the complications in analysis of the rock shape effects in ...

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Adriatic Metals plc Pre-Feasibility Study Metallurgy and ...

15/10/2020  The SAG mill will be a single pinion low aspect mill, operating in a closed circuit. The mill has an inside diameter of 3.8m and an effective grinding length (EGL) of 5.0m. The mill receives coarse ore and process water at a variable flowrate to achieve the correct pulp density. Lime and zinc sulphate are also dosed to the SAG mill to condition the feed prior to flotation. The SAG mill will be ...

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SAG Mill - Mining engineering - Eng-Tips

01/06/2005  Having been in a few process plants with SAG mills they are inefficient- as low as 1% - since power costs are becoming a big issue there is lots of research being done ( try googling under SAG Mill efficiency) -technically I wouldn't consider them a 'crusher'- they are grinding mills and some mill people might take offence- note that SAG mills are high compared to length-this is so the ...

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Risk assesment in sag mill - SlideShare

04/09/2017  New SAG Mill Risk Assessment Background NB Copper mine is one of the biggest copper and gold mine company in Indonesia. Since the first year of their production, NB produced more than 750.000 ton per annum copper concentrate and kept growing over time. Furthermore, NB Copper Company targeted to reach 1million ton copper concentrate in 2019. In order to reach their goal, NB

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A Method of C alculating Autogenous/ Semi-Autogenous ...

Since the days of mandatory high cost pilot plant testing in 6 ft × 2 ft SAG mills autogenous griding/semi-autogenous grinding (AG/SAG), mill speci c energy is now calculated by various fi empirical formulae and pilot testing carried out in small laboratory mills. Barratt (1989) described a method using Bond Indices than adding a single factor of 1.25 to arrive at the AG/SAG specifi c ...

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The Selection and Design of Mill Liners - MillTraj

High Carbon Chrome Moly Steel (325 to 380BHN): This steel is now considered the main material used for SAG mill liners. There are a number of variations with either different carbon or chrome contents. The variations tend to have a bearing on the size of the liner and its section thickness. There is ongoing development within this area as the ...

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Mineral Processing - Crushing - Plant design,

26/02/2014  GRINDABILITY TESTS SAG Mill comminution test • This is an abbreviated drop weight test, which can be performed at low cost on small samples 19 – 22 mm or drill cores. • 5 kg of sample is normally sufficient. • The advantage of the SMC test is that it generates the energy versus breakage relationship with as small quantity of sample of a single size fraction. • Because the test can be ...

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