How Ball Mill Ore Feed Size Affects Tonnage & Capacity
Hard ore Work Index 16 = 100,000/65,000 = 1.54 kwh/t. For the purposes of this example, we will hypothesize that the the crushing index of the hard ore with the increased energy input of 1.54 kw/t reduces the ball mill feed size to 6,500 micrometers. As a result, the mill output will increase with this reduced size to approximately 77,000 tons ...
اقرأ أكثر
Ball Mill Design/Power Calculation
Accordingly power consumption per unit of capacity, Po will be expressed in kilowatt hours per short ton, or kw-hr per ton. In all equations D refers to the inside …
اقرأ أكثر
AG
Power drawn at the pinion is 448 kW, 13.617 kWh/tonne (SAG mill) and 570 kW, 17.325 kWh/tonne (ball mill) when processing 32.9 mtph, for a total of 30.942 kWh/tonne or 14.6% above the …
اقرأ أكثر
Measurement of electrical energy consumption …
Thus the specific comminution energy can be. determined by 0.0254 Wh/rev (difference between 0.1331 and 0.1077) or 91.44 Ws/rev. This is equivalent to a power draw of 106. 76 W for the mill with ...
اقرأ أكثر
Grinding Media Wear Rate Calculation in Ball …
This may be done by obtaining a rough calibration of the power meter in the motor circuit so that any definite decrease in power indicates a given decrease in the weight of the charge. This is, then, the …
اقرأ أكثر
Charge behaviour and power consumption in ball mills: …
Comparing the ball only cases to the ball and rock case, we find that the inclusion of rocks leads consistently to a 0.5-kW/tonne lower specific power draw prediction, for speeds below 80%. This is a decrease of 5% to 8% and occurs in the speed range where many mills are operated.
اقرأ أكثر
Ball Charge and Grinding Efficiency
SAG mill power vs. wear geometry - maximizing kW-hr/ton & tons/hour in combination SAG mill liner change-out life/cycle vs. tons/kg consumed. Ball mill liner efficiency based on liner geometry and its influence on kW-hours/ton, total tons/life cycle, and P80 transfer to cyclones. Ball mill grind is based on different principle; it has some ...
اقرأ أكثر
power kw per ton of ball mill
2.2.7. Power at the ball mill shaft. ... where W is the energy input (work) in kilowatt hours per metric ton (or per short ton in Bond's original publications), Wi is the work index ... 1323, and 120 kWh/ton for ball, vibration, and plate milling, respectively. View chapter Purchase book.
اقرأ أكثر
Cement Plant Grinding Mills Power Consumption
The first step in this procedure is to calculate from the following formula the work index, which is the kw-hr required to grind one short ton of material from a theoretically infinite size to 80 pct passing 100 microns: where Wi = the work index. Gbp = Bond ball mill grindability. Pi = micron size of the mesh of grind.
اقرأ أكثر
Energy-Efficient Technologies in Cement Grinding
The energy consumption of the total grinding plant can be reduced by 20–30 % for cement clinker and 30–40 % for other raw materials. The overall grinding circuit efficiency and stability are improved. The maintenance cost of the ball mill is reduced as the lifetime of grinding media and partition grates is extended. 2.5.
اقرأ أكثر
CALCULATION OF THE POWER DRAW OF DRY …
Kwb – Kilowatts per metric ton of balls D – Mill diameter inside liners in meters Vp – Fraction of mill volume loaded with balls fCs – Fraction of critical speed Ss – Ball size …
اقرأ أكثر
How to Measure Grinding Efficiency
This shows the difference in power per ton of mill circuit feed consumed without taking into account the variations in mill circuit feed, mill circuit product and grindabilities as shown in data tabulated in Table III. ... Power per metric tonne motor input Kw 4.2; Motor efficiency % 95.6; ... Ball mill ratio of reduction 11.3; Power per metric ...
اقرأ أكثر
Estimation of the Specific Energy Requirement for …
Typically, the specific energy necessary to reduce the feed material to the desired product size varies in the range of 5–50 kWh/t. Therefore, it is important to have …
اقرأ أكثر
power kw per ton of ball mill
Ball Milling Power Ball Milling Ppt Ball Milling Pre. grinding mills power consumption kw..knows the power consuption in kw per ton of a.ball and tube coal mill power consumption.cement mill,raymond.get price and support online ball mill designpower calculation.the basic parameters used in ball mill design the power consumption per …
اقرأ أكثر
Table of Bond Work Index by Minerals
This Table of Ball Mill Bond Work Index of Minerals is a summary as tested on 'around the world sample'. You can find the SG of each mineral samples on the other table. Source 1 Source 2 Source 3 Source 3 Source 4 Source 5 Source 6 Source 6 KWh/t Source 6; Avg Bond Work Index: kWh/t: kWh/t: kWh/sh.t: kWh/t: kWh/t: kWh/t: kWh/t: …
اقرأ أكثر
Solved 4a. What is the power required to crush 100 tons/hr
4a. What is the power required to crush 100 tons/hr of limestone if 80% of the feed passes 2″ screen and 80% of the product passes 1/8″ screen? The work Index for limestone may be taken as 12.74 kWhr/short ton 4b. If a ball mill requires 3 kWhr per ton of feed to reduce a feed of 1600 micron size to a product of 400 microns size, calculate ...
اقرأ أكثر
Ball Mill Design/Power Calculation
W = power consumption expressed in kWh/short to (HPhr/short ton = 1.34 kWh/short ton) Wi = work index, which is a factor relative to the kwh/short ton required to reduce a...
اقرأ أكثر
Ball charge loading
This paper examines the effects of changing mill filling degree with respect to specific power consumption (kWh/ton) and product throughput as well as the impacts …
اقرأ أكثر
Determining the Bond Efficiency of industrial grinding …
The metal Bond ball mill is 30.5 cm inside diameter and. 30.5 cm inside length, with rounded corners. It is smooth except for the door hole used for charging. The grinding charge consists of 285 iron or steel balls (43 @ 36.8 mm diameter, 67 @ 29.7 mm diameter, 10 @. 25.4 mm diameter, 71 @ 19.1 mm diameter, and 94 @.
اقرأ أكثر
Rod Mill Design & Power Draw
KWr = kilowatts per short ton of rods. D = mill diameter indise liners, in feet. Vp = fraction of mill volume rod load (ground out mill). ... KW = mill power draw at the pinion shaft, kilowatts. p = rod charge bulk density, tons per cubic foot. ... For rod, ball, or pebble mills the peak is usually near Vp = .50, while actual observations as ...
اقرأ أكثر
How to use Bond Work Index to Measure Operating …
W = Measured power in kwh per either short ton or metric ton. P = The size in microns (micrometers) that 80% of the product is finer than. F = The size in microns (micrometers) that 80% of the feed is finer than. As the diameter of rod and ball mills increased and the number of installations increased, studies comparing operating work …
اقرأ أكثر
Comminution Theory & Process Equipment
In other words each foot of mill will require a definite amount of power. Capacity of a mill also varies in the same manner. Example grinding mill power calculation: You are operating an 8 feet diameter Ball Mill consuming 245 HP and grinding 500 tons per day to 65 mesh. What will be the capacity of a 5 feet grinding Mill?
اقرأ أكثر
Ball Mill Design/Power Calculation / Using modelling and …
Ball Mill Motor/Power Gluing Calculation. Globule Mill Design/Sizing Calculator. The power need to grind a material after a given feast size to a given product …
اقرأ أكثر
SFO assignment 2
Problem- Calculate the operating speed of a ball mill from the following data: (i) Diameter of ball mill=500 mm (ii) Diameter of ball= 50mm Operating speed of ball mill is 35 % of critical speed. Problem- Calculate the power required in horse-power to crush 150000 kg of feed, if 80 % of feed passes through 2 inch screen and 80% of product ...
اقرأ أكثر
Addition of pebbles to a ball-mill to improve grinding efficiency
Proportion of pebbles in the charge (vol.%) 0 25 50 100 Mill power draw (kW) Productivity (kg new 75 lm/h) Energy utilization (kW h/ton of new 75 lm) Productivity relative to ball milling (%) Energy utilization relative to ball milling (%) Pebble consumption (% of final product) 0.709 15.46 45.88 100 100 0 0.588 14.92 39.72 96.50 86.60 6.37 0. ...
اقرأ أكثر
power kw per ton of ball mill
Ball-mill power, 108 kw. Second Stage of Ball Milling. Feed rate, 6.54 T. per hr. Classifier, Dorr duplex. Ball load, 28,000 lb. of 2- and 1-in. balls. Speed, 23.8 r.p.m. Ball-mill power, 108 kw. In the first stage, 9.11 T. of minus 200-mesh material were produced per hour and 11.98 kw.-hr. were required for each ton of minus 200-mesh …
اقرأ أكثر
Modelling the power draw of tumbling mills: A …
KWb = 4.893D0.3(3.2-3Vp)Cs (1- 2(9-10Cs)) -1.102 (B-12.5D 0.1 ) 50.8 (2) where KWb is the power consumption per balls' tonne (kW/ton), D is the mill diameter (m), Cs is the …
اقرأ أكثر
CALCULATION OF THE POWER DRAW OF DRY …
A.S. Erdem, Ş.L. Ergün, A.H. Benzer 222 () KW b D V p fC s C S s s ⎟+ ⎠ ⎞ ⎜ ⎝ ⎛ = × × − × × − 9−10 0.3 2 0.1 4.879 3.2 3 1 (1) where Kwb – Kilowatts per metric ton of balls D – Mill diameter inside liners in meters Vp – Fraction of mill volume loaded with balls fCs – Fraction of critical speed Ss – Ball size factor To determine the power that a dry grinding ...
اقرأ أكثر
Grinding Mill Design & Ball Mill Manufacturer
Consequently, pebble mills convert less power per mill volume unit than rod and ball mills. ... particles pass a screen with 25 x 25 mm apertures shall be ground to approx. 95% passing 0.1 mm in a 2.9 x 3.2 m ball mill of 35 ton charge weight. ... The sizes selected are shown on the tables on page 12-13 and cover the power range of 200-5000 …
اقرأ أكثر
Ball Mill Optimization | PDF
The nearby cement plant operates with 20 mins retention time for clinker grinding in the ball mill & 70 Ton hold up. Power consumption = kW = 7.5 x Gw x D0.5 = 7.5 x 163 x 3.80.5 = 2383 kW. (Check its correctness) (13) Grinding energy = 30-35 kWh / Ton cement . Here, Gw = ball charge, ( Ton ); and D = Effective mill diameter, ( m ).
اقرأ أكثر