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 ...
WhatsApp: +86 18838072829Chemical Engineering questions and answers. QUESTION FOUR (a) 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 kWh/short ton. 5 Points (b) If a ball mill requires 3 kWh per ton of feed to reduce a feed of ...
WhatsApp: +86 18838072829power" required for size reduction. Actual powers can range from 2 to 20 times the calculated figures. Example In dry crushing of limestone, lumps of 50 mm size have their size reduced to 10 mm. Estimate the theoretical power required for a feed rate of 20 tph. Solution: According to Bond's law, the power is:) 1 1.(3600 36 ...
WhatsApp: +86 18838072829Expert Answer. Mill Feed (Micro Meter) Cumulative Percentage (%) 500 4 .. Feed and product size distribution of a ball mill are given in the following table, Work index (Wi) of the ore ground is 12 kWh per ton, Calculate the energy required for this size reduction, If the capacity of the mill is 150 t/h, what would be the power ...
WhatsApp: +86 18838072829Compared with the Vertical Spindle mills, Tubeball mills have a much higher grinding capacity. However, there are fewer literatures found in studying Tubeball mill operation compared with the Vertical Spindle mill. Ma et al. introduced a black box Neural Network model for Tubeball mills in 2005 [22]. Although the Neural Network can have a ...
WhatsApp: +86 18838072829its application for energy consumption of ball mills in ceramic industry based on power feature deployment, Advances in Applied Ceramics, DOI: /
WhatsApp: +86 18838072829Sample requirements: A minimum of 20 kg of material crushed to nominally minus 19 mm is preferred. JKTech would stage crush the sample to minus mm, as required for the Bond Rod Mill Work Index test feed. ... It can be used to determine the grinding power required for a given throughput of material under ball mill grinding conditions. It is ...
WhatsApp: +86 18838072829The following four gridtype ball mill models are recommended to meet the daily production demand of 1500 tons: MQGg2740: Diameter: Length: 4m. Motor Power: 380kW. Processing Capacity: ...
WhatsApp: +86 18838072829A powerbased method is first utilised to determ ine the required ball mill power consumption to achieve the required product P80. This would give the required ba ll mill power in closed circuit
WhatsApp: +86 18838072829The pinion power N of the ball mill was calculated using Eq. (7) [20]. The ball mill capacity Q is obtained from the ratio of the power of the pinion required by the ball mill to the unit power consumption of the grinding product, as shown in Eq. (8) [20]. The grinding kinetic formula is presented in Eq. (9) [20]. Eq.
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WhatsApp: +86 18838072829At present, the average level of unit energy consumption of Cement Manufacturing Plants is at 33 kWh, in some Cement Manufacturing Plants, it could be 40 kWh higher than the average number. Through technology improvement, equipment update, and new type abrasion materials, the Cement Manufacturing Plant could reduce the unit energy consumption ...
WhatsApp: +86 188380728290 5 10 15 20 25 30 35 40 45 50 55 60 65 Specific grinding energy w from Denver slide rule (kwh/) 0 5 10 15 20 25 30 35 40 45 50 55 60 65 Specific grinding energy w from the proposed model (kwh/) Comparison line y=x Medium ore ... (kWh/short ton) and T is the required mill capacity ... Ball mill power draw predicted from the Denver slide ...
WhatsApp: +86 18838072829Few problems • A certain crusher accepts a feed of rock having diameter of in and discharge a product of diameter in. the power required to crush 12 tons per hr is hp. What should be the power required if the capacity is reduced to 10 ton per hr and as a consequence of which the diameter of product become in?
WhatsApp: +86 18838072829Very large tonnages can be ground with these ball mills because they are very effective material handling devices. Ball mills are rated by power rather than capacity. Today the largest ball mill in operation is m diameter and m long with a corresponding motor power of 22 MW (Toromocho, private communications).
WhatsApp: +86 18838072829Generally, Roller mills can accommodate high size (up to 80100 mm) and high moisture (20 %); whereas Ball Mills can normally accommodate (up to 25 mm) moisture up to 12 %.
WhatsApp: +86 18838072829Mills of this kind reduce 1 or 2 ton/h to an average particle size of 1 to 20 µm, with an energy requirement of about 40 kWh/metric ton. Fluid energy mills: In such mills the particles are suspended in a highvelocity gas stream which flows in a circular or elliptical path. In some design there are jets that oppose one another or ...
WhatsApp: +86 18838072829The power input required to maintain this condition is theoretically: hp = (W) (C) (Sin a) (2π) (N) where W = weight of charge. C = distance of center of gravity or charge from center of mill in feet. a = dynamic angle of repose of the charge. N = mill speed in rpm. The value of the angle a varies with the type of discharge, percent of ...
WhatsApp: +86 18838072829The acceleration factor of the ball or rod mass is a function of the peripheral speed of the mill. Thus. n = c9np/√D, the above equation becomes P = f1 (D²)·f5 (πD c9 np/√D) = cs np As a first approximation, the capacity, T, of a mill may be considered as a function of the force acting inside the mill.
WhatsApp: +86 18838072829To reduce runofmine to mill feed requires reduction in a series of stages. The physical size and power requirements of a crusher capable of reducing hard rock vary depending on the application. Extended experience in most crushing plants show that a minus 19MM (¾") rod mill feed can be and is being produced in three stages of crushing.
WhatsApp: +86 18838072829a. ball mill c. fluid energy mill b. rod mill d. jaw crusher. 4. Maximum size reduction in a ball mill is done by ... What is the power required to crush 100 ton/hr of limestone if 80 percent of the feed passes a 2in screen and 80 percent of the product a 1/8 ... What would be the power consumption of the capacity is reduced to 100kg/h and the ...
WhatsApp: +86 18838072829The ball mills crushed 78 tons per day and, after classification, the coarser part of this, amounting to 38 tons, was ground to about 250 mesh in the tube mill. The pulp fed into the mill contained: coarser than 40 mesh, per cent.; 40 to 60 mesh, per cent.; 60 to 100 mesh, per cent.; 100 to 150 mesh, 7'6 per cent.
WhatsApp: +86 18838072829If the capacity of the mill is 150 t/h, what would be the power consumption in the mill? (20 points) Mill Feed Wt, Size fractions (Î¼m) (%) +500 500+400 ... 1 Calculate the power required for ball mill grinding. 2 Calculate the percent critical velocity (Ï†) of the mill if a grinding ball of size m is to be used and the ...
WhatsApp: +86 18838072829The calculated power input or horsepower in the above example is 316. Therefore, a 350hp motor is required and this in turn indicates that an 812 (8′ x 12′) Rod Mill is required. In the same way Fig. 3 indicates that an 800hp motor and a 101/214 or ′ by 14′ Ball Mill is required. Following is a condensed tabulation of the above ...
WhatsApp: +86 18838072829Cytec Handbook. Why have a large circulation load:. If a product all finer than a certain critical size is required, the capacity of the ball mill is increased considerably by using it in closed circuit with a classifier and this increase is made still greater by increasing the circulating load in between the ball mill and the classifier (Fig. 70).
WhatsApp: +86 18838072829I'm interested to know when sizing a new ball mill, as to why recirculating load has no effect on the power calculation, although it will have effect on volumetric capacity naturally. For instance a mill of 300tph with a 300% recirculating load would have 1200 tph going through effectively, but if we reduce the recirculating load to 200% at ...
WhatsApp: +86 18838072829Let us consider by dry grinding 40 − 1 of ore in a ball mill that enters at 5 ... The relationship between mill capacity, power, and cost of grinding are shown in Fig. The output is also related to the grindability of the coal. ... Estimate the power required (Kick's law) to crush the same limestone having a mean size of 2 mm ...
WhatsApp: +86 18838072829What are the dimensions of the ball mill you are looking at? 40% ball charge is quite high (unless you are looking at a small mill). A difference (duty vs. maximum) of 5% to 10% is fairly typical and you would likely struggle to perceive an energy efficiency difference between the two operating points.
WhatsApp: +86 18838072829Higher capacity than AG mill grinding; Primary, coarse grinding (up to 400 mm feed size) ... Larger than Ball mills at same power draw . Special Tumbling Mill Special tumbling mills [image: (135614)] ... normally expressed in kWh/ short ton). Other established methods, for instance Hardgrove Index, population balance. ...
WhatsApp: +86 18838072829Kick's law (1885) the energy required to reduce a material in size is directly proportional to the size reduction ratio dL/L, that is the ratio of the initial particle size to the finial particle size This implies that P equal to 1. If P = 1 then 2 1 ln L L CE putting C = KKfc gives: 2 1 ln L L fKE cK KK is not dimensionless.
WhatsApp: +86 18838072829The basic parameters used in ball mill design (power calculations), rod mill or any tumbling mill sizing are; material to be ground, characteristics, Bond Work Index, bulk density, specific density, desired mill tonnage capacity DTPH, operating % solids or pulp density, feed size as F80 and maximum 'chunk size', product size as P80 and maximum and finally the type of circuit open/closed ...
WhatsApp: +86 18838072829Grate Discharge Ball Mills have shown 25% to 45% more tonnage ground and a substantial reduction in power consumed per ton of material compared size for size with overflow mills. To illustrate the characteristics of various type mills we have shown the types of discharge for rod mills and ball mills. There are essentially four types of rod mill ...
WhatsApp: +86 18838072829Jaw crushers, Ball mills, Fluid energy mills. Ball mills, Jaw crushers, Fluid energy mills ... The power required to crush 100 ton/hr of a material is kW, if 80% of the feed passes through a 51 mm screen and 80% of the product passes through a mm screen. ... GATECHmo2mark. mo. What is the critical rotational ...
WhatsApp: +86 18838072829In test 3, in which the grid was used to segregate the different sizes of balls, a further advantage of about 4 percent in efficiency is shown. The conical mill in test 4 increased the efficiency to 58 percent more than in test 1. The efficiency with the long (6foot) conical mill was about the same as with the short (3foot) one.
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