PREDICTING AG/SAG CIRCUIT SPECIFIC ENERGY USING THE Dwi The power-based approach to design uses a methodology which, given certain ore breakage characteristics, predicts the specific energy for a particular AG/SAG mill circuit. The multiplication of the specific energy by the target throughput gives the required power draw of the mill. A …
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SAG Mill power draw models are used in mill design and grinding circuit modelling to predict how much power will be consumed by a particular mill geometry and operating …
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Semantic Scholar extracted view of "Converting AG to SAG mills: The Gol-E-Gohar Iron Ore Company case" by M. Maleki-Moghaddam et al. Skip to search form Skip to main content Skip to account menu. Semantic Scholar's Logo. Search 217,798,537 papers from all fields of science. Search ...
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AN UPDATED DATA SET FOR SAG MILL POWER MODEL CALIBRATION *A. G. Doll SAGMILLING Logan Lake, Canada ABSTRACT This paper expands the SAG mill survey database published by the Author at Procemin 2013. The new database includes 49 published SAG/AG mill surveys and includes mills from all over the world. The
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At the concentration plant of the Gol-E-Gohar Iron Ore Company (Iran) three 9 m × 2.05 m AG (autogenous) mills (fixed speed) are used in parallel in a dry operation. The performance of AG mills has been lower than the target value indicated by an increase in the product size (P 80; 80% passing size) from 450 μm (target) to 515 μm and low …
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This study shows that grinding hard iron ores in the AG mills needs more power consumption, and a product with larger particle size will be produced. Hence, the …
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Instead relatively cheap and accurate power-based techniques are used following the development of equations which accurately predict the specific energy and power draw of AG/SAG and ball mills (Morrell, 1996, Morrell, 2004a, Morrell, 2004b, Scinto et al., 2015, Lane et al., 2013), combined with the development of laboratory ore ...
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SAG mills consume significant amounts of power, water, and consumables, and thus pose sustainability- and OPEX-related ... Savage River iron ore in Australia and Ridgeway gold mine in Australia. Alternatives to SAG mills: Dry comminution ... energy than AG/SAG mill circuits," agreed Green, although ...
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Learn about the design and operation of SAG mills, which are primary grinding units for various ore types and circuit configurations. Compare SAG mills with …
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reliance of ag/sag mills on the feed ore for their grinding media competence and size. Ag mills are the most sensitive in this respect ... throughput at constant mill power. Over the range of F80 covered (70-110mm) the effect is considerable with the specific energy and throughput varying by about 30%. 0 500 1000 1500 2000
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The study has demonstrated that the integration of acoustic sensing techniques in AG/SAG mills can serve as a proxy for online measurement of different rock/ore hardness, for example, as a fast track method to determine the hardness of ores in comparison to the traditional ore grindability procedures, such as Bond work index …
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For instance, in an iron ore operation using 6.4 m (21 ft.) mills, mill throughput was increased by 15 percent and power consumption reduced by 13 percent by liner redesign alone. Generally in FAG mills more cascade action is desired, so lift is increased by 25-50 mm (1-2 in.).
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A total of 21 SAG/AG tests, four of which included ball milling, were conducted at different configurations and conditions. Fig. 3 shows the pilot-scale AG/SAG mill configurations, and Table 1 summarizes the apertures of grates, pebble ports and trommel used in the tests. It is worth mentioning that there were no open pebble ports in …
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Representative sample: The only ore blend a SAG mill will never see. Critical size: Ore component that is harder than the mill has power to grind at the specified rate. When a SAG mill is too small, pebble crushing allows the critical size to be eliminated and throughput is increased. Conversely, critical size pebbles occur when hard ore
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3.3.1 AG/SAG Mills The power-based approach to design uses a methodology which, given certain ore breakage characteristics, predicts the specific energy for a particular …
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economies of SAG/FAG mills. Figure 2 compares blast energy to electrical consumption in the SAG mill. The concern at this operation was that excessive blast energy was depleting the source of media rock. Although that problem has been documented for some types of ore; excessive blast energy does not appear to be the culprit in this case.
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At the concentration plant of the Gol-E-Gohar Iron Ore Company (Iran) three 9 m × 2.05 m AG (autogenous) mills (fixed speed) are used in parallel in a dry operation.
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A linkedin 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) (3) Using Don Burgess' …
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AG/SAG and ball mill circuit data is also very poor. Use of equation 2 shows a very different picture, the results being illustrated in Figure 7. This shows that on average the "M" operating work indices of AG/SAG and ball mill circuits are very similar and hence energy utilisation efficiencies are similar. Also the AG/SAG and ball mill ...
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In this study, the relationship between acoustic emissions and hardness of different rock types (model quartz, model calcite, and real iron ore) coupled with binary mix ratios of model quartz and iron ore (1:3, 1:1 and 3:1) was investigated in a laboratory-based AG/SAG mill.
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power draft and mill load in AG and SAG mills has traditionally been by load cells estimating the charge. ... and real iron ore) coupled with binary mix ratios of model quartz and iron ore (1:3, 1 ...
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The JKMRC has been studying and modelling industrial AG and SAG mills for over 40 ... (model quartz, model calcite, and real iron ore) coupled with binary mix ratios of model quartz and iron ore (1:3, 1:1 and 3:1) was investigated in a laboratory-based AG/SAG mill. The acoustic emission response and sensitivity of the mill were …
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AG/SAG mills comminute ore through impact breakage, attrition breakage, and abrasion of the ore serving as media. ... With a higher density mill charge, SAG mills have a higher installed power density for a given plant footprint relative to AG mills. With the combination of finer grind and a lower installed power density (based on the lower ...
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Conclusion and Future of SAG Mills in Copper Ore Mining. SAG mills have proven to be efficient and reliable machines for grinding copper ore in the mining industry. They are a critical component of the processing circuit and play a significant role in achieving optimal product size distribution, energy efficiency, and downstream mineral recovery.
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The variables including ore hardness based on the SAG power index (SPI), particle size of mill product (P80), trunnion pressure of the mill free head (p) and working time period of mill liner (H) were considered as variables for development of an adequate model for the prediction of autogenous (AG) mill power consumption in Sangan iron ore processing …
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Akbari-Nasab et al. modeled the power consumption of the AG mill of the Golgohar iron ore processing plant based solely on the SPI index [19]. The sampling was performed from the AG mill feed and the samples were subjected to the SPI test. They also received data on the AG mill's power consumption from the control room. Finally, based on
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SAG MILL TESTING - AN OVERVIEW OF THE TEST PROCEDURES AVAILABLE TO CHARACTERIZE ORE GRINDABILITY AUTHOR: F.O. VERRET, G. CHIASSON AND A. MCKEN - SGS KEYWORDS Comminution, grindability, grinding, SAG mill, AG mill, milling, HPGR, work index, pilot plant INTRODUCTION The resistance of ore samples …
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This paper presents the structure of the latest version of the JKTech autogenous and semi-autogenous (AG/SAG) mill specific energy model, which is an adaptation of that …
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3.2 Mine-to-Mill The feed size to AG and SAG mill circuits has been demonstrated to have a significant impact on throughput with effects such a that illustrated in Figure 7, being commonplace. Modifying blast design and primary crusher operation can significantly influence AG/SAG mill feed size, hence giving a potentially cost effective way to
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The application of autogenous/semi-autogenous (AG/SAG) mills is widespread in industrial mineral processing plants as first stage-grinding units for ore size reduction, mineral liberation purposes, and economic benefits [1,2,3].These mills are used for grinding large quantities of ores of varying characteristics, which presents control …
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This work assesses the potential suitability of autogenous (AG) and semi-autogenous (SAG) milling through an extensive pilot plant campaign carried out with itabirite iron ores. The effects of ore ...
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Most empirical comminution models are calibrated to two-stage AG/SAG mill and ball mill circuits -- this work compares the performance of several commonly used power-based …
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And the product of the large AG/SAG grinding is either a finished size ready of processing, or an immediate size for further grinding in a ball mill, pebble mill, VERTIMILL® or a stirred media detritor (SMD). Grinding circuit design AG/SAG mills are normally used to grind run-offmine ore or primary crusher product. Feed size to the mill is ...
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