Model Predictive Control of SAG Mills and Flotation Circuits

Precise control of SAG mill loading and flotation cell level is critical to maximize production and recovery in mineral concentrators While expert systems are commonly used to optimize these process operations the underlying regulatory control is often implemented using traditional proportional integral derivative PID controllers or rule based schemes in the expert systems themselves

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Summary of Mill Survey Results 80 survey 1 SAG 2 70 Survey 1 2 2 3 60 Blast # 340 319 320 314 320 314 310 316 SAG 1 Muck Load vol % 50 Ball Load vol % 40 Ball Size mm 150 125 125 125 30 Power KW 4550 4650 3970 4310 20 Bearing Pressure 3900 3740 3720 3927 10 kpa 0 Mill Speed rpm 10 100 1 000 10 000 100 000 1 000 000 SAG

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AG/SAG mill is inefficient in grinding particles of a certain size typically in the range of 25 55 mm pebbles Therefore cone crushers are often used as pebble crushers and integrated into AG/SAG mill circuits to break the critical size particles that accumulate in the mill and to increase the performance of the primary grinding circuits

Get PriceA mill power equation for SAG mills SpringerLink

01 02 1990· where m p is in kW; D is internal mill diameter meters L is internal mill length meters ; J is total fractional charge loading of the mill; J B is the fractional mill filling by balls; ε B is the effective porosity of the charge taken as ; ρ s and ρ b are true densities of rock and balls tons per cubic meter respectively; w c is the weight fraction of rock in water and rock in

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SAG 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 AG/SAG mills when calculating power according to the Bond Third Theory method

Get Price PDF Circulating load calculation in grinding circuits

Circulating load calculation in grinding circuits 1 I ntroduction The mass ba lances in m ineral pro c essing circ uits are based on t he equation of mass conservation given by F = C T 1

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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 in diameter powered by a 28 MW 38 000 HP motor

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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 128m in diameter powered by a 28 MW 38 000 HP motor

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power calculation formula of sag mill 21 Jun 2021mill charge load calculation Crusher Granite The ball mill ball calculation formula The mill Read more grinding media charging in ball mill

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Get PriceINFERENTIAL MEASUREMENT OF SAG MILL PARAMETERS IV

SAG mill total feed SMTF is calculated by mill model inversion Solids Balance The solids component of the SAG mill total feed SMTF/smtf is estimated by the inversion of the Whiten steady state perfectly mixed mill model Whiten 1974 see Equation 15 The perfectly mixed mill

Get PriceCalculate Sag Ball Mill Circulating Load

Circulating Load Calculation Screen Screen Circulating Load Calculation Get Prices circulating load calculation made in a mill this plant includes one SAG mill in a closed circuit with a vibrating screen and one ball mill with a size classification necessary to calculate the proportion of each mills energy of ball mills circulating load was obtained 149 which is

Get PriceA New Approach to the Calculation of Work Index and the

The mill power is = Watts calculated by 6 Fi P nally the product is wet screened to find the size d80 Rod Mill Semi Continuous Process The same mill is used for the semi continuous grinding tests which is similar to the Bond test but with the exist ing mill of known power After time the mill product is t wet screened at a predetermined screen size From the weight difference

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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 in diameter powered by a 28 MW 38 000 HP motor A SAG mill with a 44 diameter and a power of 35 MW 47 000 HP has been designed Attrition between grinding balls and ore

Get PriceSAG Mill Optimization using Model Predictive Control

& Mainza 2021 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 exhibits integrating behavior and the mill can overload quickly This situation is complicated by the transport delays in the feed system so it is important that the control system can detect the imminent

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· Single stage AG/SAG mills have to handle large amounts of slurry as they are generally in closed circuit with classifiers whose circulating loads reach as high as 400 500% The geometry of radial and curved pulp lifters is such that the slurry once passed through the grate into the pulp lifter will always be in contact with the grate until it is completely discharged which makes the flow

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Calculation Of Sag Mill Weight From Bearing PressuresAbout calculation of sag mill weight from bearing pressures related information dam a barrier built across a watercourse to impound or divert water a barrier that

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· Bar steel mill in Völklingen km in length Neunkirchen works Combined wire rod and bar mill Burbach works 4 strand wire rod mill Burbach Three locations one guiding idea and a foundation based on 400 years With this formula for success Saarstahl produces the best steel at three locations Each location thereby fulfills the highest demands regarding quality efficiency and

Get PriceOptimizing your SAG mill operation International Mining

21 03 2021· The mill discharge from these mills consists of slurry which goes to the ball mills for further grinding and coarse pebbles/rocks which are crushed and sent back to the mill To maximize the capacity of these circuits the general practice is to use grates with pebble ports reaching 100 mm instead of normal grate openings to increase the pebble removal

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The SAG mill pinion energy W SDT kWh/t and SAG discharge Bond ball mill work index S dBWI kWh/t are then used to calculate the total energy to grind the ore from 80% passing 152 mm to 80% passing the client specified final product size P information along with the ore specific gravity is used to calculate necessary mill sizes and motor power in industrial appliions

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Single stage SAG Mills are very beneficial in reducing CAPEX for plants with a staged throughput approach When future tonnage is to be increased the SAG Mill can feed downstream ball milling to boost capacity Fuller Traylor SAG/AG Mills range in size from through in diameter with powers as high as 28 000 kW Our team of product engineers continually improves SAG/AG Mill

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LG A mill power equation for SAG mills Minerals and Metallurgical Processing Feb 1990 pp57 62 Gross power No load power Net power drawn by the charge 813 The net power is calculated from Net power KD25L e c/ Watts 814 In equation 814 D is the diameter inside the mill liners and Le is the effective length of the mill including the

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power calculation formula of sag mill Power Calculation Formula Of Sag Mill We have sold many of crushing and grinding units to more than 130 countries GROSS POWER CALCULATOR Pictures of the insides of an AG mill and a SAG mill which have been crash stopped are shown in power draw of an AG/SAG mill to drop can be gauged by switching

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Design of the 40 foot SAG Mill Installed at the The design of the 40 foot diameter SAG mill installed at the Cadia Gold calculation based on pilot plant SAG mill 8% ball charge Maximum SAG mill

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MODEL PREDICTIVE CONTROL OF SAG MILLS AND FLOTATION CIRCUITS Michael G Forbes and Bill Gough ANDRITZ AUTOMATION Ltd 100 13700 International Place Richmond BC V6V 2X8 Canada Corresponding author ABSTRACT Precise control of SAG mill loading and flotation cell level is critical to maximize production and

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