Ideal Crusher/Grinder • Have large Capacity • Require a small power input per unit of product • Yield a product of single size or the size distribution required ... or wood in a ball mill, ... 60 per cent with an average diameter of mm and a balance having an average diameter of mm. Estimate the power required, assuming that ...
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 18838072829The basic parameters used in ball roller structure (power calculations), rod mill otherwise any tumbling mill sizing live; material to must ground, characteristics, Bond Work Index, bulk specific, specific density, desired mill tonnage capacity DTPH, operating % solids or pulp gas, feed size as F80 and maximum 'chunk size', product size as P80 and maximum and finally the type off circuit ...
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 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 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 18838072829Ball mills. Ball mill (Fig 1) is same kind of mill as rod mill, except that it is filled with balls instead of rods. ... The product size can be extremely fine, although an air classifier is required when such product size is required. Maximum capacity is of the order of 10 tons per hour and power consumption is relatively high. Rotating hammer ...
WhatsApp: +86 18838072829The capacity of the ball mill is usually considered to vary as the power of the diameter and directly as the length. As the effective diameter of the ball mill is measured inside the liners, it is important to know exactly whether the diameter of the ball mill in question is measured inside the shell or inside the liners when calculating ...
WhatsApp: +86 18838072829Gyratory crusher: feed diameter to ; reduction ratio 5:1 to 10:1, usually 8:1; capacity 140 to 1000 kg/s; Mohs hardness <9. More suitable for slabby feeds than jaw crusher. [reduction by compression]. Roll crusher: feed diameter 1 cm: reduction ratio 5:1 to 10:1; capacity to 20 kg/s: Mohs hardness <
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 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 18838072829Todays ball mills are typically designed to operate with ball charge fillings up to 35% by volume. There are cases where this figure is higher, for example with mill shells designed for higher loadings, but these cases are becoming more rare, with the additional cost of steel becoming prohibitory of this design.
WhatsApp: +86 18838072829The bottom parameters used in ball milling design (power calculations), rod mill or any tumbling mill page is; material to be ground, property, Bond Employment Card, bulk density, specific density, wish mill tonnage capacity DTPH, operates % stables or pulp density, feed extent as F80 and maximum 'chunk size', product size as P80 and maximum and...
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 a...
WhatsApp: +86 18838072829Noise 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.
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 18838072829further reduced in size. Water is added to the ball mill, in which a slurry that usually contains from about 20 to 55 percent solids is produced (Singh, 2010; International Mining, 2011) (see fig. 2). The mill operates in a closed circuit with screens that size the ore and cyclones that sort the ore by size and density.
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 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 18838072829The operational controls are also reviewed for optimized mill operation. Every element of a closed circuit ball mill system is evaluated independently to assess its influence on the system. Figure 1 below is a typical example of inefficient grinding indicated by analysis of the longitudinal samples taken after a crash stop of the mill.
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 1883807282919. A certain crusher takes rock whose average particle diameter is m and crusher is to give a product whose average particle diameter is m at the rate of 20,000 kg/hr. At this rate, the mill takes 684 kgf m/sec of power and 35 kgfm/sec power is required to run it empty. (1) What would be the power consumption in terms of HP for same capacity if the average particle diameter in ...
WhatsApp: +86 18838072829Power required to drive a ball mill with a particular ball load is proportional to (where, D = diameter of ball mill ) A. D. B. 1 D. C. D D. 1 D Answer: Option C. This Question Belongs to Chemical Engineering >> Mechanical Operations.
WhatsApp: +86 18838072829Planetary Ball Mills. Sample volumes up to 4 x 220 ml. Final fineness*: µm. Extremely high centrifugal forces result in high energy input. Dry and wet grinding by impact and friction. To the product range. Ultrafine grinding with up to 76 g.
WhatsApp: +86 18838072829Accordingly power consumption per unit of capacity, Po will be expressed in kilowatt hours per short ton, or kwhr per ton. In all equations D refers to the inside diameter of the mill in feet and v to the peripheral speed of the mill in feet per minute inside the liners.
WhatsApp: +86 188380728291. 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 consumption in the mill? (20 pnts) Mill Product Mill Feed Size fractions (um) Wt.
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