Influence of feed size on AG / SAG mill performance Authors: S. Morrell Walter Valery The University of Queensland Figures Discover the world's research Content uploaded by Stephen Morrell Author...
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In this presentation an historical perspective of the origins of MinetoMill is described and is followed by a discussion of how AG/SAG feed size affects throughput and specific energy and the factors that in turn influence AG/SAG feed size, such as ore hardness, Run of Mine (RoM) size distribution and crusher operation (both primary and secondary).
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Analysis of the recorded mill acoustic response using statistical root mean square (RMS) and mill discharge sizes showed that the introduction of fresh feed with varying hardness and size distribution considerably altered the mill product undersize of −150 μm and acoustic emission.
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It is observed that the percentage passing 75 l m in the feed is very low, that is, %. The results indicate that further grinding is required to obtain the set flotation target of 40 % ...
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Based on experience, millliner designs have moved toward more openshell lifter spacing, increased pulp lifter volumetric capacity, and a grate design to facilitate maximizing both pebblecrushing circuit utilization and SAG mill capacity. As a guideline, mill throughput is maximized with shell lifters between ratios of :1 and :1.
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When the feed size of a SAG mill becomes coarser, α r increases, the energy required to break the ore increases, φ r and φ f increases (Morrell et al., 1996; Morrell and Valery, 2001 ...
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SAG mill throughput versus feed size. Reprinted from Scotia Bank (2014b). ... with the throughput at 30% passing 25 mm nearly half that at 52% passing 25 mm. Typical SAG mill feed from a large ...
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Recently, acoustic sensor measurements have gained upsurge of interest in the grinding circuit, particularly AG/SAG and ball mill to monitor and optimise charge dynamics such as the toe and shoulder angle, load level estimation, particle size distribution, pulp viscosity, ore breakage rate, charge size distribution and interaction and liner ...
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Define SAG mill. means a semiautogenous grinding mill. A SAG mill is one in which steel balls are added to the mill charge to supplement the grinding capabilities of the larger pieces of ore. ... a SAG mill in closed circuit with hydrocyclones and a recirculation pebble conveyor system to achieve the optimal grind size of 80% passing 75 ...
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study focussed on ball mill limited material from the Apensu open pit. Following a benchmarking study of all blasting, crushing and grinding practices in January 2009, PTI recommended changes in both blasting and crushing conditions in order to generate a finer feed size to the SAG mill.
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The purpose of the primary crusher is to reduce the ROM ore to a size amenable for feeding the secondary crusher or the SAG mill grinding circuit. The ratio of reduction through a primary crusher can be up to about 8:1. Feed: ROM up to m. Product: 300mm (for transport) to 200mm (for SAG mill) Feed Rate:
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Over a relatively short time period taking a belt cut and sieving the material is the most accurate method of determining the size distribution of the ag/sag mill feed. However, fluctuations in feed size make such sizings valuable only if they can be done very frequently, which is clearly impracticable in a production environment.
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The Importance of Understanding Feed Size as well as Hardness in SAG Mill Performance. This presentation explores how current grinding circuit design methods ignore the importance of feed size and focus entirely on feed hardness. In fact, the measurement of hardness is dependent on the size of material so, in fact, hardness and particle size ...
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Relation between Sag mill solid and product P80! Both are dependent on feed size. Dependent on Volume % solids in SAG mill. Dependent on ball charge volume. Hardness of ore. Recirculation load. Dependent on P80% size. All other parameters are secondary. In general Sag mill solids are kept at 70% by wt. Operating grinding circuit is an art.
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Ball mills in HPGRBall mill circuits tend to have more installed capacity than their counterparts in AG/SAGBall mill circuits. This is because the product size distribution from AG/SAG mills ...
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SAG mill acoustics can serve as online proxy tool for providing more insight into different feed size fractions in the mill. The practical implication of the study could be beneficial to SAG mill operators by predicting a sudden change in feed size in realtime. Abstract
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To collect reliable data, the plant comminution circuit was initially investigated and it was decided to take samples from the SAG mill feed, discharge and screen overflow. The sampling from the SAG mill discharge was made by a sampling cutter as shown in Fig. 2a. The discharge cutter was a pipe with a 50 cm diameter, m length and closed end.
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In this video presentation an historical perspective of the origins of MinetoMill is described and is followed by a discussion of how AG/SAG feed size affects throughput and specific...
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The capacity of the SAG mill is related to lots of factors such as feed size, size distribution, discharge size and grindability, etc., and it should be confirmed according to the actual situation. SM40*14'——means it is a dry mill.
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Common convention generally refers to highaspect ratio mills as SAG mills (with diameter to effective grinding length ratios of 3:1 to 1:1), lowaspect ratio mills (generally, a mill with a significantly longer length than diameter) are also worth noting.
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... January 2007, two complete grinding circuit surveys were performed followed by a SAG mill crash stop and grindout. After stopping the mill, a SAG mill feed sample was also...
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SAG mills have special requirements on feed size distribution, which is influenced by the size distribution of the blasted rock (Esen 2013). The 80% passing size, x 80, is regularly used to ...
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In [5,6], the correlation between acoustic emissions, hardness, and feed size in SAG mills was studied using machine learning models. In [ 7 ], a deep learning approach to study mineral hardness and predict related values is presented.
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A material supplier from Belgium would like to produce limestone powder for his custome...
India is rich in various mineral resources and it is an important mineral processing market
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