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2012-9-18Vol. Filling WvalC Grind Curves Power Load 1 2 4 3 5.1 5.2 Figure 3 WvalC primary SAG mill grind curves Sep 2010 to Oct 2010 Hulbert 2006 warns that external factors might invalidate the comparison of results based on data before versus data after a process change
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2020-6-620 to 30 TPH for gold ore SAG Ball Mill duty 25 to 40 th for copper porphyry SAG Ball Mill duty In Single Stage SAG duty the approximate capacity reduces to only 8 to 13 TPH for gold ore duty. The autogenous mill itself is a coarse-grinding device consisting of tumbling drum with a 25 to 40 volume filling of ore. Metallic or
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2012-9-18Vol. Filling WvalC Grind Curves Power Load 1 2 4 3 5.1 5.2 Figure 3 WvalC primary SAG mill grind curves Sep 2010 to Oct 2010 Hulbert 2006 warns that external factors might invalidate the comparison of results based on data before versus data after a process change
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PDF On Jan 1 2011 A. P .P van der Westhuien and others published Milling curves as a tool for characterising SAG mill performance Find read and cite all the research you need on ResearchGate
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2019-10-9filling in the mill and not related to total mill filling. Discharge through an individual opening on the grate is driven by the factors of ore filling radial position and the sie of the aperture. The results indicate that 1.18 mm is approximately the sie below which particles
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Kinross Paracatu and Metso Process Technology and Innovation PTI have reviewed and optimied the operating strategies for the SAG mill circuit at Paracatu operation in Brail
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2013-5-6Comparison of Ore Hardness Measurements for Grinding Mill Design for the Tenke Project John Starkey1 Principal Consulting Engineer These are tests which up to the present have been an integral part of many comminution studies. Bond BM Wi kWht SAG ground ore 8.91 11.33 7.61 7.77 9.46 11.75 8.32 9.31 Pinion kWht to T
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2009-7-30The geometry of a mill with conical ends is shown in Figure 8.6. The total volume inside the mill is given by Vm 4 D2 mL 1 2Lc L L 1 DtDm 3 1 DtDm 8.16 The density of the charge must account for all of the material in the mill including the media which may be steel balls in a ball mill or large lumps of ore in an
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2020-6-6The SAG mill trommel screen oversie feeds a pebble crushing circuit which returns crushed product to the SAG mill feed conveyor the company said. The milling circuit meanwhile is fed with F100 250 mm primary crushed material from the primary stockpile at a throughput rate of 300 th and produces a product sie of 70 passing 75 m which
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The power draw of the mill was set at 2300 kW to provide mill filling of at least 20 depending on the ore hardness. At this operating condition i.e. mill power draw of 2300 kW the effect of power draw of exhaust fan on the product sie was investigated over a period of two months Fig. 8
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Online SAG Mill Pluse Measurement and Optimiation . By Raj Rajamani Jose Delgadillo and Vishal Duriseti make-up ball sie mill speed liner profile and ball addition rates. At the same time it can also be used to design balls and liner systems that can survive longer in the mill. mill speed and mill filling
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The discharge grates of the SAG mill were identified as a key component in the SABC circuit and their design is a crucial factor in the mills performance 1718192021. The initial design of the grate section caused a serious accumulation of pebbles within the SAG mill
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An ore like quartite is very competent and will not break up easily in an SAG mill. Soft and fragile ore like bauxite or specular hematite will break up relatively easily. Again clayey and oxidised ore may be too soft to serve as a grinding medium and therefore are classified as incompetent ore
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2019-5-15angle increases the mills outlet flow. Keywords grate SAG-Mill DEM-Simulation flow-back carry-over 1. Introduction Sie reduction of ores has an important role in the process of obtaining various metals. For example for copper the ore must be separated from the mineral and must reach sies smaller than 50 m and this
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2020-3-22History. Brian Loveday 1978 published a scale-up procedure for autogenous pilot plant power draw to industrial sied machines that used an empirical power number to encompass all the motion effects of a mill charge. Derek Barratt 2002 derived a set of power numbers for industrial machines for use in Lovedays base formula where a power number for a particular mill filling and
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2017-6-27HIGmill - High Intensity Grinding 1 Product News 40 SAG mill 6 Case Study Assarel Medet 7 Business News Backfill Specialists acquisition 11 VPF technology 12 Product News Reline Machines 16 It is a well recognised fact that global ore grades are declining while commodity demands continue to rise. These ore bodies are
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2020-4-12Optimisation of a SAG mill though trajectory and power milling. ABSTRACT 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
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The need for an improved method of measuring and controlling volumetric filling led to the recent installation of the Outotec MillSense a SAG mill toe angle instrument. This paper presents the integration of the toe angle control in to the Lihir SAG mill process control philosophy as replacement for the traditional mill weight control
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Typically SAG mill control is performed with respect to bearing pressure and other process variables which are used to estimate volumetric loading in order to optimie the mill throughput. While these methods are typically effective they can also have several shortcomings when changes in mill liners lifter profiles wear ore density
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2018-3-4Operational Trends Start-up to 1.5 hours Slide 8 LDL purple Toe yellow. Outlet fill level blue Inlet fill level red Shell fill level green. Three plots show mill filling slowly over 1.5 hour period left to right. Fill levels increase as expected and LDL begins to drop as mill becomes full
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2019-10-9A thesis submitted for the degree of Master of Philosophy at The University of Queensland in 2015 mill filling and mill speed. Performance indicators such as power draw specific production rate mill holdup and Figure 15. Comparison of SAG mill discharges for Cu-Zn ore Klymowsky and Rijkers
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2018-6-7 Mill sie diameter length Maximum ball top-up sie Mill rotational speed rpm variable or fixed speed single or dual rotation Ore type abrasivity of the ore Mill discharge type grate discharge mill overflow mill Available drilling pattern Total filling degree ore and balls FAG SAG Main design parameters
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2014-10-1The 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 AGSAG
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2018-11-28Control of a grinding mill circuit using fractional order controllers Norelys Aguila-Camachoab Johan D. Le Rouxc Manuel A. Duarte-Mermoudab Marcos E. Orchardab a Department of Electrical Engineering Faculty of Mathematical and Physical Sciences University of Chile Av. Tupper 2007 Santiago de Chile Chile. b Advanced Mining Technology Center Av. Tupper 2007 Santiago de
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2013-10-16An increase of over 10 in mill throughput was achieved by removing the ball scats from a single-stage SAG mill. These scats are non-spherical ball fragments resulting from uneven wear of balls with included porosity. 30t of scats were removed from a total charge load of 70t. Surveying and modelling the mill revealed that the breakage rates
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2020-6-9articleosti895022 title ONLINE SAG MILL PULSE MEASUREMENT AND OPTIMIZATION author Rajamani Raj and Delgadillo Jose and Duriseti Vishal abstractNote The grinding efficiency of semi autogenous milling or ball milling depends on the tumbling motion of the total charge within the mill. Utiliation of this tumbling motion for efficient breakage of particles depends on
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2020-6-3articleosti922135 title Improving Energy Efficiency Via Optimied Charge Motion and Slurry Flow in Plant Scale Sag Mills author Rajamani Raj K abstractNote A research team from the University of Utah is working to make inroads into saving energy in these SAG mills. In 2003 Industries of the Future Program of the Department of Energy tasked the University of Utah team to
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The High Intensity Grinding HIG mill from Outotec has been designed specifically to manage complex fine-grained ore bodies that are rapidly becoming more economically viable.. Complex ore bodies require a finer grind sie for maximum mineral recovery and grade setting new challenges particularly for grinding technology
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