SAG mill throughput is often a bottleneck to increasing plant productivity Improved size distribution control in the mill feed can be used to increase mill production This can be accomplished by controlling blast fragmentation as a function of energy input and rock characteristics Such an approach requires the integration of rock fragmentation and comminution modeling

Get Pricerespect with SAG mills being increasingly less sensitive as the ball charge is increased (Morrel S and Valery W, 2001) 22 EFFECT OF FEED SIZE DISTRIBUTION ON SAG MILLING The qualitative eﬀect of changes in particle size distributions (PSD) on the SAG mill performance can be addressed by using the grind curv

Get PriceGrinding Mill Power Curve mill is the energy consumption The power supplied to the mill is used primarily to lift the load medium and charge Additional power is required to keep the mill rotating 813 Power drawn by ball, semi-autogenous and autogenous mills A simplified picture of the mill load is shown in Figure 83 Ad this can be used to establish the essential ,

Get PriceTitle: Tabulation of industrial mill data, best fit equations for PSDs 1 Results: Example “SAG Feed” curve for project 0116 shows a “GS” distribution Example “SAG Product” curve for project 0116 shows a “RR” distribution 100 1000 10000 100000 1000000 0% 10% 20% 30% 40% 50% 60% 70% 80% 90% 0% 10% 20% 30% 40% 50% 60% 70% 80 ,

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Get Price2015-7-1respect with sag mills being increasingly less sensitive as the ball charge is increased morrel s and valery w, 2001 effect of feed size distribution on sag milling the qualitative eect of changes in particle size distributions psd on the sag mill performance can be addressed by using the grind curv

Get Price21 SAG mill modeling In MODSIM, one of the simulation models used for a SAG mill unit is SAGT (Semi-Autogenous Grinding with Trommel) model In this model, a SAG mill with a trommel screen at mill discharge is modeled using the full population balance ,

Get Pricemill under steady state then cutting off all feed streams to the mill as it is being stopped Sufficient time is required to obtain all the important measurements correctly during the crash stop The mill filling should be measured at a minimum of 3 points along the mill Excess of slurry could also be estimated To get rid of pulp and rocks in ,

Get PriceThe mill is fitted with 80 mm grates withThe SAG mill was designed to treat 2,065 t h 1 of ore at a ball charge of 8% volume, total filling of 25% volume, and an operating mill speed of 74% of critical The mill is fitted with 80 mm grates with total grate open area of 766 m 2 Hart et al, 2001

Get PriceAG AND SAG MILL CIRCUIT SELECTION AND DESIGN BY SIMULATION , Characterisation of the Breakage Rate Distribution These rate curves exhibit a characteristic shape The coarser (R5 , Figure 4: Effect of F,, on Breakage Rate Distribution (sag mill) However in the case of autogenous grinding the pattern is differ- ent In this case a higher F ,

Get PriceSAG mill design,SAG mill for sale for the ball milling process High energy SAG mills are used to grind powder material down to a particle size below , have been made and the distribution of the balls impact velocities ,

Get Priceregarding the e ects of ore size distribution on SAG mill's performance is needed In other line, ore size distribution has been measured using model-based soft sensors (Casali et al, 1998; Apelt et al, 2002) and laser scanning (Kaartinen and Tolonen, 2008) However, image processing-based sensors are the

Get PriceJan 01, 2016· The SAG mill had a 6–8% ball charge and the power consumption was 8 kWh/t, which agreed well with the expected value 96 Problems 91 In an SAG mill the dimensions of the mill were 975 m × 35 m and the specific gravities of the mineral and ,

Get PriceSize Distribution SAG Mill Balls | Crusher Mills, Cone 翻译此页SAG mill design,SAG mill for sale for the ball milling process High energy SAG mills are used to grind powder material down to a particle size below have been made and the distribution of the SAG mill design,SAG mill ,

Get PriceThis is illustrated in Figure 6 where the model’s predictions of the size dependence of the breakage product distribution is given for an autogenous pilot scale mill treating a very competent copper/gold bearing ore Figure 3: Traditional Representation of the Breakage Rate Curve for an Ag/Sag Mill Figure 4: Attrition Breakage Frequency Curve

Get Pricerate [t/hr], smdc is the SAG mill discharge size distribution [%retained w/w], MV DC_H2O is the SAG mill discharge water addition rate measured variable 3[m3/hr] and SG l is the process water specific gravity [t/m ] Step 2: SAG Mill Rock Charge The SAG mill rock charge properties (SMRC) and size distribution (smrc) are estimated by the reverse-

Get Price23 Mine to mill and optimisation 12 24 General summary of blasting influence on downstream conditions 15 3 Description of blasting results 17 31 Fragment size distribution 17 32 Other fragment properties 18 33 Damage aspects 19 4 Considerations based of fragmentation models 21 41 General considerations 21

Get PriceMines (WA) 36ft SAG mill the number of Outer Head Liners was reduced from 36 to 18 pieces and in doing so reduced the time to replace them by 9 hours at a cost downtime saving of about U$25,000 per hour In this case the liners sections are 35 t each

Get PriceINFLUENCE OF FEED SIZE ON AG SAG MILL PERFORMANCE on mill performance and and a SAG mill operating curve to listen to your SAG or ball mill Inquire Now [PDF] extending pipe life SPC spcnet Advertisements Article 1c pdf extending pipe life In the year 2000 it was estimated that of the 2 2 mil Curves 1 and 2 represent approximately 30% ,

Get PriceParticle Sizes Distribution Models There is a common need to determine the amount of material in the feed at a given particle size The desired particle size may not have been included in the original particle size analysis The two common models used include: Gates-Gaudin-Schuhmann Model (GGS) Rosin-Rammler Model (RR)

Get PriceWarman® mill circuit pumps the best choice for mill circuit applications Warman® mill circuit pumps easily manage large size particles in highly abrasive slurries and are specifically designed for the most severe slurry applications such as ball and SAG mill cyclone feed plus water-flush crushing in mineral processing plants

Get PriceDec 01, 2006· The application of grindcurves to SAG mill testwork has been found invaluable to conducting meaningful comparative tests The resultant curves are also of direct use in establishing optimal control objectives of the mills, in seeking the balance between throughput and product size, or just seeking maximum throughput

Get PriceNowadays, experimental semi-autogenous (SAG) mill and drop-weight test are used for evaluation of grinding circuit regarding changes in feed particle size distribution, size of the ball, speed of mill, prediction of energy required, and product size distribution for complete grinding in AG and SAG mills

Get Price1 CONGA: THE WORLD’S FIRST 42 FOOT DIAMETER 28 MW GEARLESS SAG MILL T Orser1, V Svalbonas 2 and *M Van de Vijfeijken 3 1Newmont Mining Corporation 10101 East Dry Creek Road Englewood, CO 80112, USA 2Metso Corp 2715 Pleasant Valley Rd

Get PriceThe particles size distribution slope is not affected by the mill speed (see Graph 2) as the curves are mostly overlapping Density These tests were done with a ∅082 x 1 m grate discharge mill with a 30 mm graded ball charge and a 30% filling degree The mill discharge pulp density was ,

Get PriceThe 0 min differential particle size distribution curve shown in Figure 2 reveals that the mass percentages of 1700μm sand particles are 0, the mass percentages are 425 to 1700 μm, the mass percentages are 425 to 1700 μm, This illustrates that most fragments of sand are not nearly 1500 μm in size until milling If the particles rise, the mass percentage decreas

Get Pricedistribution affects the SAG mill load and the load affects directly the mill power and the efﬁciency of the mill operation (Van Nierop and Moys, 2001) If a SAG mill has been designed with a conventional power or speciﬁc energy model which do not con-sider the projected feed size distribution it is likely that this mill

Get Priceparameters used by the AG/SAG mill model in JKSimMet which permits prediction of the product size distribution and the power draw of the AG/SAG mill for a given feed size distribution and feed rate In 0 10 20 30 40 50 60 70 80 90 100 0 05 1 15 2 25 3 35 4 t10 (%) Ecs (kWh/t) Weighted Fit 63 x 53 45 x 375 315 x 265 224 x 19 16 x 132

Get PricePJV is running the SAG mills at approximately a 12% ball charge and the ball milling circuit is The purpose of the “Mine-to-Mill” project was to determine the impact of not often constrained blasting on SAG mill feed size distribution and hence mill throughput

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