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?
(PDF) Determination of correlation between specific
Keeping the vibration values on the main driving motors less than 4 mm/s by periodical maintenance, the specific electrical energy consumption of the mill has reduced by 2.16% to 24.97 kWh/ton ...
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 …
Solved Calculate the power needed to reduce 100 ton/hr of
Calculate the power needed to reduce 100 ton/hr of quartz (work index = 17.5 kW-hr/ton) in a grinding ball mill from an 80% passing size of 2 inches to an 80% passing size of 1/8 inch. The answer is 11.4 hp. Please show solution on how it arrived to that answer.
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 …
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 …
Ball Mill Design/Power Calculation
If P is less than 80% passing 70 microns, power consumption will be. Ball Mill Power Calculation Example. A wet grinding ball mill in closed circuit is to be fed 100 TPH of a material with a work ...
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. ...
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 ...
power kw per ton of ball mill
ball mill sizing tonnes per hour. ball mill size of 500 ton per day. Small Pilot Plant Grinding Mill Know More The 911MPEPPGR426 is a small 300 kilo to 3 5 ton per 24 hour day capacity grinding mill acting primarily as a rod mill but can effortlessly be converted to a ball mill Thanks to the integrated spiral classifier it forms an easy to operate closed …
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 …
Jhamarkotra phosphate ore processing plant
power consumption from 55 kWh per metric ton of ore processed to 50kWh per metric ton. ... ball mills (600 kW). The roller press discharge cake is wet screened over a screen (of 3.6
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 …
Factors for Ball Mill -Design-Sizing Calculator & Formula
Fraction of the Total Mill Power Draw contributed by the Interstitial Slurry in the ball charge. Corresponds to the ratio between the Total Charge Weight and its Apparent Volume (including interstitial voids). Estimation based on FLSmith (Krebs) Capacity Correlation. Ideally, design value should not exceed 13 psi.
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.
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.
Vertical roller mill for raw Application p rocess materials
Table Energy saving effect of the vertical roller mill Ball mill Specific power Cost estimation About 14million US$ [Newly-built] and about 230 million US$ [retrofitted], including ... of power consumption rate is not remarkable but below 1 kWh per ton of raw materials. Cost estimation 18,000 to 36,000 US$ per system [1US$=¥110] Related ...
Ball Mill Design/Power Calculation | Ball Mill Design/Power …
The basic parameters used in ball mill design (power calculations), rod mill with any tumbling mill sizing are; material on be ground, characteristics, Bond Labour Index, loose sealing, specific density, desirable mill quantity capacity DTPH, running % stables or pulp density, add size more F80 the maximum 'chunk size', product size as P80 and utmost …
Review on vertical roller mill in cement industry & its …
Noise is quite lower in VRM when compared to a ball mill. The noise is just 20 to 25 dB which is lower and environment friendly [15], [16]. • Lower specific power consumption per ton of cement. It is just 50% to 65% of the ball mill consumption [19]. • The metal wear of the unit product is low.
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 ...
Bond Work Index Formula-Equation
In the standard A-C closed circuit ball mill grindability test the work index is found from. where Pi is the opening in microns of the sieve mesh tested, and Gbp is the net grams of mesh undersize produced per …
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.
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 ...
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 ...
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 ...
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 ...
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 ...
MODULE #5: FUNCTIONAL PERFOMANCE OF BALL …
Let's define the ball mill specific grinding rate* as the weight of new product (fines) produced per unit of effective energy* (applied to the coarse particles). Ball mill Circuit …
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 …
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 ).
