Apr 08, 2018· The 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 %

Get PriceDec 12, 2016· The 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

Get PriceBond Mill Power Equation A model of mill power as affected by mill speed, saimm- worked examples involving bond's equation in grinding mills,Jun 6, 1993 grinding mills become more sophisticated, the need for accurate work done in this area Rose and affect the nature of the dependence of P on N, for example (a) Bond's model as given by

Get Pricegrams per revolution (Gbp) is the ball mill grindability. The ball mill work index, Wi (kWh/short ton) is calculated from the following equation (Bond 1961):1 The mill should be cleaned by either blowing air into it or wiping the interior with a cloth and or brush. The FC Bond ball mill

Get PriceDec 12, 2016· The 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

Get PriceThe ball mill specific power consumption E ball is determined by deducting a cone crushing component from the Bond/Rowland E ssbm specific power consumption. See the base formulae in the Bond S model. a value of -0.05 means use 5% less than Bond/Rowland S formula to predict E ball.

Get PriceBond’s equation can be used in a number of useful ways: 1. Process and equipment design can use the equation by inputting the desired feed (F80) and product sizes (P80), measuring a work index value (Wi) in the laboratory and then calculating the specific energy consumption required of

Get PriceAn integrated form of Hukki’s general equation leads to a power function described in equation (2) for the situation where F80 >> P80. E=K(x)−a ( 2 ) The total energy required to break the feed ore to a product size P80 stated by Bond in his third theory of comminution is shown in equation (3). E=(10Wi)×((P80) −½−(F 80) −½) ( 3 )

Get Pricepower according to the Bond Third Theory method. Rod mill and AG/SAG mill products are similar and tend to be not as steep as a 0.5 slope when plotted on log-log paper. This is because the particle size distribution (PSD), these mills produce have a coarse fraction but also a ﬁ ne fraction which is

Get Pricestructure reflected the equations of Bond, Hogg and . Fuerstenau and their earlier equation from 1982. A major (SAG) mills it was found necessary to have mill power equations for the large D/L

Get Pricecrushing/HPGR/tumbling mill circuits that go into generating the total comminution circuit specific energy . The . Mib Estimate from Bond Wib. window gives the Mib value that the model has estimated from using equations 1 and 2. “Cautionary Tales” Bond, in his published papers specified that the Bond ball mill laboratory test should be

Get Pricepower n. If the exponent n in Equation [1] is replaced by the values of 2, 1 and 1.5 and then integrated, the well-known equations of Rittinger, Kick and Bond, are obtained respec- The test work involved Bond ball mill testing, rod milling, low intensity magnetic separation (LIMS), and batch ball milling down

Get PriceBond Rod Mill Grindability Test. The test determines the Bond Rod Mill Work Index which is used with Bond’s Third Theory of Comminution to calculate net power requirements when sizing ball mills*. Various correction factors may have to be applied. The test is a closed-circuit dry grindability test performed in a standard rod mill.

Get PriceThe Bond Index conforming rod charge consists of: 6 rods of 1.25“ diameter and 21“ length; 2 rods of 1.75“ diameter and 21“ length; The grinding jar for the Bond Index Rod Mill is 12″ x 24″ in size and has a wave-shaped design. At least 15 to 20 kg sample material is required to simulate a closed grinding circuit in a ball or rod mill.

Get PricePower draw Standard of mill(s) (@ pinion(s)) = 3,150 kW . Circuit Feed F80 =2,500 µm . Circuit Product P80 = 212 µm . Test WI of circuit feed ore = 16.1 kWh/t (The Bond ball mill test Work Index of the ore, whichapplies over the size reduction range of this circuit) W = 3,150 kW / 450 t/h = 7.0 kWh/t

Get PriceIt is generally accepted that practical mill power (PM ) is a function of mill capacity and diameter, i.e.,P M = Mill Constant * (Mill Diameter ) n where n = 0.3 to 0.5. It is evident that mill power is a function of the height at which the media is lifted and the density of the media, i.e., PM = K Ï b LD 2.5 where k is a proportionality constant.

Get Pricethe ball mill is less energy efficient than a crusher and has to input more energy to do the same amount of size reduction). Hence from equation 7, to crush to the ball mill circuit feed size (x. 2) in open circuit requires specific energy equivalent to: f x f x 2. 1 W c ic. 1.19* 4

Get PriceEquation 1 to drive the corrected power requirement (Rowland, 1982). The equation for Third Theory of Comminution Bond’s was originally developed for use with conventional crushing and grinding circuits (crusher-rod-ball mill or crusher-ball mill).

Get Pricegrams per revolution (Gbp) is the ball mill grindability. The ball mill work index, Wi (kWh/short ton) is calculated from the following equation (Bond 1961):1 The mill should be cleaned by either blowing air into it or wiping the interior with a cloth and or brush. The FC Bond ball mill

Get PriceOct 24, 2018· Specific Energy Consumption is the power draw of a mill (kW, usually corrected to the pinion or mill shell) The Work Index is a fitted coefficient to Bond's equation given in

Get PriceThe specific comminution energy for milling in the Bond test mill appears to be based on 60 J/rev, which defines the net energy required in the Bond ball mill to realise the same grinding

Get PriceThe mill power is = 22.5 Watts, calculated by (6). Fi- P nally the product is wet screened to find the size d80. 2.4. Rod Mill Semi Continuous Process The same mill is used for the semi continuous grinding tests which is similar to the Bond test but with the exist- ing mill of known power. After time the mill product is t

Get PriceBond’s equation can be used in a number of useful ways: 1. Process and equipment design can use the equation by inputting the desired feed (F80) and product sizes (P80), measuring a work index value (Wi) in the laboratory and then calculating the specific energy consumption required of

Get PriceThe Rowland and Kjos equation indicates that power draw is a function of the fraction of the critical speed for the mill. Bond quantified the rod mill power draw as a function of the Work Index, capacity, and a series of correction factors: PM = Wmtest,i FT Q. FT = F1 F2 F3 F4 F5 F6 .

Get Price3. Using the following equation for calculating the energy required for crushing & grinding: d 80P 80F Energy Required, (kWh)=10. Bu ton where: Bwi = Bond work index for ore, kWh/ton (ton = short ton or st =2,000 lbs); dsop = 80% passing size for product from crusher or grinding mill in microns. d80F = 80% passing size for feed to crusher or grinding mill in microns.

Get PriceBond ball mill and grind for an arbitrary number of mill revolutions (N 1 = 50, 100 or 150 revolutions). After grinding, screen the sample on the comparative sieve and determine

Get PriceBond mill power equation. fred bond ball mill power draw equations acdc . ball mill equipment equations . i attach fred bonds first empirical equation for sizing grinding balls for ball mills as, browser tool for ball mill design. Live Chat Design, Construction And Performance Analysis Of A 5.

Get PriceA mill is a device that breaks solid materials into smaller pieces by grinding, crushing, or cutting. Such comminution is an important unit operation in many processes.There are many different types of mills and many types of materials processed in them. Historically mills were powered by hand or by animals (e.g., via a hand crank), working animal (e.g., horse mill), wind or water ().

Get PriceThe power draw estimate is based mostly on the Bond ball mill formula where the feed to the ball mill is the projected SAG mill discharge that Read more

Get PriceBond formula for the grinding balls size calculation. Oct,each mill manufacturer recommends certain grinding media type for mill operation under certain conditions the crushed material parameters, the mills performance, the raw materials particle size in the mills feed,and the required grinding fineness finished class content past experience of a ball mill

Get PriceThe experimental execution conditions of the standard Bond test, together with the specification of the Bond mill are given in Table 1. Table 1. Bond's mill specification and grinding conditions Mill diameter, D m, cm 30.48 Mill Length, L m, cm 30.48 Number of mill rotations in minutes, n, min-1 70 Mill balls weight, M b, kg 21.125

Get PriceThe Bond Work Index equation is indeed a process engineering tool for the ages. This bulletin describes its form and basic uses. Another bulletin will describe how Bond used it to prescribe mill power requirements for new projects by measuring the Work Index of the ore, and subsequently how to use it to calculate and compare circuit efficiencies.

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