# the maximum reduction ratio of sag mill

### What are the differences between ball mill and rod mill

2021 3 8 The cylinder of the ball mill is a barrel or a cone And the ratio of the length to the diameter of the cylinder is small and in most cases the ratio is only slightly larger than 1 and the floor area is small too Therefore it should be considered whether the equipment installation conditions can

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### The engineering and process effects of choosing a motor

2021 10 5 The SAG mill power draw model of Austin using the cali bration by Doll 2013 is used to predict the process power draw at the mill shell Pshell and the efficiency losses for the drive’s mechanical components based on Doll 2012 are used to determine the motor output power P The effect of varying the mill speed as a fraction of the critical

Get Price ### Calculate the Reduction Ratio and the Number of Milling

2021 3 28 Besides material sizes from blasting coud be accurately estimated Therefore some inaccuracies are introduced when calculating the reduction ratio using the maximum sizes 80 reduction ratio The 80 reduction ratio is the ratio of feed and product diameters through which pass 80 of particles in mass see formula below R/1=F80/p80

Get Price### Sag Mill Disadvantage

Disadvantage Of Ball Mill Iso9001 2008 ag mill or sag mill for sale semi autogenous sometimes in order to increase processing capacity it can be added to a small crushing ratio up to 3000 4000 compared with a ball mill or rod mill grinding the disadvantage of dry autogenous grinding is for high mud water large noet more Read More.

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### The Use of Hydrogen in the Iron and Steel Industry

2018 8 28 Reduction by CO Reduction by H 2 THE USE OF HYDROGEN IN THE IRON AND STEEL INDUSTRY Consumes 500 Nm 3 /t 10.8 GJ/t is a conservative calculation based on maximum users during gas ratio partial pressure Temperature C Fe/FeO Equilibrium Diagram X X.

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### OPTIMAL ROTOR TIP SPEED RATIO

2016 2 10 Figure 1 Power coefficient as a function of tip speed ratio for a two bladed rotor Maximum power extraction occurs at the optimal tip speed ratio The uncaptured power is caused by the fact that the tip speed ratio is not constant as well as the inherent inefficiencies and

Get Price ### Schematic Flow Sheet of the AG/SAG Mill Model.

The grinding media of autogenous mills derive from the feed ore size and composition Delboni and Morrell 1996 and the varying ratio of different components in the mill feed affects the mill

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### Page 1 Page 2 INTRODUCTION SAG

2014 10 1 Reduction in the high capital cost associated with comminution circuits limitations are the single stage AG/SAG mill circuit and the rod mill circuit However all circuit types eventually reach a maximum single maximum size of quality steel rods and the required aspect ratio of the mills This typically has the effect of limiting the

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### Mechanics of Materials Deflection

2014 12 25 original unloaded position Beams deflect or sag under load Even the strongest most substantial beam imaginable will deflect under its own weight Under normal conditions the actual amount of deflection in floor beams is generally un noticeable as shown in Figure 1 1 Maximum Actual deflection ∆ max

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### MetE 215 Materials Processing Laboratory EXPERIMENT

2017 11 12 ii The speed of rotation of the mill iii Nature of the feed iv Type of the grinding circuit Basic types of grinding mills 1 Rod mills uses steel rods as grinding medium 2 Ball mills uses steel balls as grinding medium 3 Pebble mills uses pebbles as grinding medium 4 Autogeneous mills uses ore itself as grinding medium

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### SHEDDING LIGHT ON SECONDARY CRUSHING B

2014 10 1 diameter x 3.68 m EGL 27.9 ft x 12.2 ft SAG mill equipped with a 4 900 kW variable speed drive The SAG mill discharge passes over a trommel The trommel oversize material is discharged onto a conveyor and the pebbles are crushed in a 315 kW pebble crusher prior to return to the SAG mill feed The trommel undersize is discharged into the

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### Grinding control strategy on the conventional milling

2009 8 27 ratio through a cascade loop For example if the ratio is specified as 2 and Cyclone 2 particle size is 30 300 µm the control loop will attempt to add water to Cyclone 1 sump to achieve a particle size of 15 300 µm If the hardness of the ore increases the particle size in the mill discharge from ball mill 1 will increase With the

Get Price ### Crushing Grinding.ppt

2020 4 22 SAG mill speed to fast for fine feed size Solution Slow down SAG mill to increase the mill load to around 25 thereby using more of the SAG power to do fine grinding not impact A 3 5 improvement in grind size could be achieved through the control of SAG loadat the same throughput.

Get Price### Optimization of a SAG Mill Energy System Integrating

2019 7 1 An optimization is carried out to minimize the yearly cost of energy for the operation of the SAG mill This cost includes the energy consumption cost in /kWh and the capital cost for the PV BESS infrastructure prorated over the life of the battery system accounting for the discount rate through an annuity factor Pamparana et al 2019a b .The energy requirements are defined by the SAG

Get Price### The design space for long duration energy storage in

2021 3 29 Design of LDES technologies In this study we set the minimum ratio of energy capacity to discharge power for LDES systems at 10 1 and the maximum at

Get Price### Difference Between Sag Mill vs Ball Mill

2017 10 12 1 SAG mill is the primary tool for grinding SAG mill is used before the other mills Ball mill is a secondary and it is used after the SAG mill 2 SAG mill breaks the raw material into pieces for the further grinding Ball mill is used to grind the pieces of raw material into powder like structures 3.

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### Optimization of mill performance by using

2010 4 23 previously at a mill stop the measurement of ball charge filling degree could be undertaken and will provide the static media charge angle βstatic = 143 An online measurement of the similar angle βdynamic when the mill is running provides information about the dynamics of the charge The ratio between the dynamic and the static

Get Price ### PDF Multi component AG/SAG mill model

Accordingly the mill power consumption decreased from 8.4 to 5.16 kWh/t a nearly 40 reduction and the fresh feed flow rate increased from 515 to 615 t/h a nearly 20 increase in the mill

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### The Effect of Aspect Ratio on the Grinding Efficiency of

and Closed Circuit AG/SAG Mills S Morrell1 ABSTRACT The aspect ratio mill diameter/mill length of autogenous and semi autogenous mills varies widely and can be as high as three or as low as 0.5 The literature on the subject of what effect aspect ratio has on grinding mill performance or energy efficiency is almost non existent.

Get Price ### sag mill optimum charge size

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 12.8m in diameter powered by a 28 MW 38 000 HP motor

Get Price### The design space for long duration energy storage in

2021 3 29 Design of LDES technologies In this study we set the minimum ratio of energy capacity to discharge power for LDES systems at 10 1 and the maximum at

Get Price### Mill Speed

Mill SpeedCritical Speed Mill Speed No matter how large or small a mill ball mill ceramic lined mill pebble mill jar mill or laboratory jar rolling mill its rotational speed is important to proper and efficient mill operation Too low a speed and little energy is imparted on the product.

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### C

2018 2 20 the HPGRball mill circuit achieved a 21 reduction in energ y consumption over the existing SAGball mill circuit at the same P 80 grind size of 160 µm At a grind of 80 passing 75 µm the HPGRstirred mill circuit showed a 34 reduction in energy compared to the base case It was concluded that the energy

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### Selecting Inching Drives for Mill and Kiln Applications

2016 5 21 Ratio selection is established to obtain the required mill speed in conjunction with open gear set ratio and main drive gear reducer ratio where applicable The normal duty of an incher is intermittent Therefore lower service factors can be specified since the expected 25 years life of the mill / kiln the inching system would operate

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### MILLING CONTROL OPTIMISATION

2012 2 7 Figures 8 and 9 on the right show results from a gold plant’s SAG mill achieved with MillStar’s Segregated Ore Feed Controller combined with the Power Optimiser The standard deviation of the mill feed control is greatly reduced The cyclone feed is more stable allowing for consistent size separation and feed to downstream processes.

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### OPTIMAL ROTOR TIP SPEED RATIO

2016 2 10 Figure 1 Power coefficient as a function of tip speed ratio for a two bladed rotor Maximum power extraction occurs at the optimal tip speed ratio The uncaptured power is caused by the fact that the tip speed ratio is not constant as well as the inherent inefficiencies and

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### AUTOGENOUS MILL FEED PREPARATION TO REDUCE

2018 2 20 Compared with SAG mill grinding autogenous grinding using feed prepared to include coarse competent rock and crushed finer rock resulted in a 14 reduction in grinding energy expressed as kWh/t and no steel balls were required as additional grinding media The coarse rock amounted to about 20 of the mill feed.

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### OPTIMAL ROTOR TIP SPEED RATIO

2016 2 10 Figure 1 Power coefficient as a function of tip speed ratio for a two bladed rotor Maximum power extraction occurs at the optimal tip speed ratio The uncaptured power is caused by the fact that the tip speed ratio is not constant as well as the inherent inefficiencies and

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### Optimizing hammer mill performance through screen

2018 6 12 hammers are also common in hammer mill designs Hammer mills are recognized as technology capable of finely grinding the greatest variety of materials 3 13 and are noted for achieving high size reduction ratios and yielding cubic shaped particles 14 15 Hammer mills have a wide application in biomass size reduction

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### Optimized Iron Ore Blast Designs for SAG/AG Mills Jack

2013 4 21 Reduction in capital costs and reduced operating costs through the reduction or wholesale elimination of grinding media led to adoption of SAG and FAG flow sheets in certain iron ore plants recent developments in the understanding of blast through mill size reduction call into question the actual economies of SAG/FAG mills.

Get Price ### SAG mill Archives

2021 11 7 The SAG mill has a mill diameter of 24 ft 7.3 m and an effective grinding length of 18.5 ft and a structural charge mass of 315 t Condor Gold said The structural design ball charge is 11 with a structural design load volume of 35 Specific gravity of the material is 2.55.

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### Power Quality Monitoring Waveform Analysis

2008 5 6 Boundary E This boundary covers two different types of voltage sags The first type of sag E1 is related to application of large loads motor starting etc These sags are generally shallow >80 retained voltage but their duration is long up to 10 seconds The second type of sag E2 is typically related to faults on the power system.

Get Price ### Types and Mechanisms of Gear Reducers

2021 10 11 Generally reduction ratio is limited to 1 6 for one stage Table 2.2 shows the gears for bevel gear reducers Types and mechanisms of gear reducers with skew axes Gear reducers whose input and output axes are offset and orthogonal to each other generally use hypoid gears or worm gears Especially worm gears have been used to reduce speed for

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