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Get PriceIn Fig 3 Fig 4 the data is presented in order to show the effect of the fresh feed size particularly the −6″ 1″ −152 25 mm on the SAG mill power consumption Pc in kW and on the SAG mill specific energy consumption Ecs in kW ht obtained by dividing the power
Get PricePrediction of correct sag mill power consumption with a change in ore hardness solid percent density to the sag feed rpm of sag and PSD has always been very tricky So far I have used AustinMorrell model and Hogg Fuerstenau power model but these models seem to work well only under certain boundary conditions
Get PriceSAG is an acronym for semiautogenous 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 128m in diameter powered by a 28 MW 38000 HP motor
Get Price ϕC is the mill speed as a fraction of the mill critical speed eg 075 for 75 The power result of the Austin model is relative to the “mill shell” also referred to as power “at the pinion” Austin proposed a geometric factor be applied to the formula for use in coneended mills
Get Priceas a kinetic and potential energy balance to describe the power draw of a mill charge The power drawn from a cylindrical shellsupported mill is given by Equation 1 1 1 ˘ˇˆ˙˝˘ ˛˚ ˜ 06 ˘ˇˆ˙˝˘ ˛˚ ˜’ 1 ˚ ˜ 1 Where • A and K are empirical fitting factors
Get PriceThe SAG Power Index SPI test Starkey Dobby 1996 uses a benchscale SAG mill test to determine the specific energy of an industrial SAG mill 80 of 17 mm is used to predict AGSAG specific energy using Equation 3 and other powerbased models available in CEET Comminution Economic Evaluation Tool
Get PriceTable of ContentsSAG Mill ChargeSAG Mill Horsepower Drive PowerOre Testing for AG SAG Grinding Mill Design Mill Sizing After laboratory and pilot plant testing confirm the feasibility of autogenous or semiautogenous grinding it can be used to establish the exact grinding circuit and mill size In the pilot plant tests the tare power of the pilot plant mills should be determined
Get PriceAN UPDATED DATA SET FOR SAG MILL POWER MODEL CALIBRATION A G Doll 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 SAGAG mill surveys and includes mills from all over the world The
Get PriceIn these circuits the SAG mill is the largest energy consumer In many engineering projects either a power equation andor a specific energy equation are used for the designing of these mills but not always with acceptable results
Get PriceThe three SAG mill models are benchmarked and reviewed in Doll AG A comparison of SAG mill power models Procemin 2013 Austin SAG Model The Austin SAG model was published in Austin LG A mill power equation for SAG mills Minerals Metallurgical Processing Society for Mining Metallurgy Exploration February 1990 Morrell Models
Get PriceSAG is an acronym for semiautogenous 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 128m in diameter powered by a 28 MW 38000 HP motor
Get PriceSAG mills mimic the same shortcoming It follows that in order to obtain the speciﬁ c energy SE to achieve a certain transfer size based on the 80 per cent passing value an inefﬁ ciency factor must be applied to the SE of single stage ball mills rod mills or AGSAG mills when calculating power according to the Bond Third Theory method
Get PriceAGSAG mills are normally used to grind runoffmine ore or primary crusher product Feed size to the mill is limited to that size which can be practically conveyed and introduced into the mill The mill product can either be finished size ready for processing or an intermediate size ready for final grinding in a ball mill pebble mill or
Get Priceapproach to modeling of mill power draw Trans Instn Mining Metall Sect CMineral Processing Extr Metall 105 JanuaryApril 1996 ppC54C62 Austin LG A mill power equation for SAG mills Minerals and Metallurgical Processing Feb 1990 pp5762 Gross power No load power Net power drawn by the charge 813 The net power is calculated from
Get PriceOct 12 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 20This process takes place inside the large rotating drum of SAG mill which is filled with balls partially
Get PriceConsolidation and validation of several tumbling mill power models covering the power draws of ball SAG and AG mills in the range 7 7900 kW of a single logical equation for SAG mill
Get Pricemills The mills in mining operation grind the product from the crushers to fine material ready for treatment Rod mills ball mills autogenous mills and semiautogenous mills SAG Mills all have a number of lubricating and hydraulic systems and they must work to keep mineral output high
Get PriceA further explanation is required to explain the importance of designing the SAG mill chamber to draw required power at optimum operating conditions of 75 critical speed and less than 30 by volume load Recent studies in the threefoot diameter SAG mill are instructive The following graph shows the relevant facts as Figure 2
Get PriceGROSS POWER CALCULATOR General This model uses the equations from Morrell’s 1993 PhD thesis “The Prediction of Power Draw in Wet Tumbling Mills” The model is also described in detail in the book “Mineral Comminution Circuits Their Slurry pooling causes the power draw in AG and SAG mills to be lower than a mill without a slurry
Get PriceOutotec has delivered everything from small lowcost singlestage SAG mills to the largest mill in the worldwith a 40foot diameter and 28 MW of motor power Ball mills Ball milling is the most common application for horizontal tumbling mills
Get PriceA mechanistic state equation model for 349360 A mechanistic state equation model for semiautogenous mills A mill power equation for SAG mills Modelling SAG milling power and specific energy the feed percentage of intermediate size particles tumbling mills power equations have been ables with the dependent variables SAG mill power and speciﬁc
Get Price21 CONCLUSIONS Continued In the present work equations were also derived giving zthe ballmill power drawP as a function of its dimensions internal mill diameter D and length L zthe ballmill power drawP as a function of the feed D f mm and the product size d mm the Bond work index w i kWhshort ton and the mill throughput T short tonh zthe ballmill dimensions D and L when
Get PriceSAG is an acronym for semiautogenous 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 128m in diameter powered by a 28 MW 38000 HP motor
Get PriceA model of mill power as affected by mill speed saimm worked examples involving bonds equation in grinding millsJun 6 1993 grinding mills become more sophisticated the need for accurate work done in this area Rose and affect the nature of the dependence of P on N for example a Bonds model as given by equation 1 involving theWhy
Get PriceJan 30 2019 · Austin LG 1990 A mill power equation for SAG mills Miner Metall Process 757–63 Google Scholar 2 Morrell S 1996 Power draw of wet tumbling mills and its relationship to charge dynamics part 2 an empirical approach to modelling of mill power draw Trans Inst
Get PriceThe power numbers that Barratt published are based on mills with typical coneends probably 15° to 25° A flatended shellsupported mill is expected to have 5 less power draw Model Form Lovedays equation is Where P is the power evolved at the mill shell kW P N is the empirical power number read from the chart below
Get PriceA further explanation is required to explain the importance of designing the SAG mill chamber to draw required power at optimum operating conditions of 75 critical speed and less than 30 by volume load Recent studies in the threefoot diameter SAG mill are instructive The following graph shows the relevant facts as Figure 2
Get PriceMill power Usually plant operators use mill power readings as an indicator of ball filling degree and often try to keep it at the maximum level It is well known that the mill absorbed power depends on operating parameters other than ball level such as pulp density and liner configuration Figure 2 shows that there is no linear relation between
Get Pricea wet tumbling mills Power draw of cylindrical section is calculated using Equation 3 Power draw of conical section is calculated using Equation 4 and noload power is calculated using Equation 5 Morrell 1996 Schematic diagram of coneend of a wet system ball mill seen in Figure 1 is not so same shape as the dry system multi
Get PricePower draw submodel The power draw model given by Austin 1990 and used here is MFkD25L1AJHmWAWb f q m where D and L are the diameter and length of the mill Vm is the internal mill volume J the volumetric mill fraction filling occupied by the total holdup Wb is the mass holdup of steel balls f is a function of the critical
Get PriceAs part of the development of a general simulation model for semiautogenous SAG mills it was found necessary to have mill power equations for the large DL pancake type of SAG mill popular in
Get PriceEvery mining operation has a unique grinding process Metso has experience of over 8000 grinding mills globally including manufacturing and delivering the largest SAGAG mills in the world Our experts welcome the opportunity to assist you with circuit and circuit control design as well as startup operation and optimization of your mill
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