Bond Mill Power Equation

Mill (grinding) - Wikipedia

A 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 ().

Application of Operating Work Indices in Autogenous ...

F.C. Bond's third theory has been shown to provide the best correlation in decades of power-based design and analyses of conventional grinding circuits (Bond 1961). Bond's third theory is presented in [1]. By rearranging the formula to [2], the operating work index (Wio) of an existing grinding circuit can be calculated, given known mill power

BOND'S WORK INDEX: WHAT IT IS AND WHAT IT ISN'T

Bond'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 the process equipment (E). 1.

MODELING THE SPECIFIC GRINDING ENERGY AND BALL-MILL …

21 CONCLUSIONS Continued In the present work, equations were also derived, giving: zthe ball-mill power drawP as a function of its dimensions: internal mill diameter D and length L, zthe ball-mill power drawP as a function of the feed D f (mm) and the product size d (mm), the Bond work index w i (kWh/short ton) and the mill throughput T (short ton/h), zthe ball-mill …

bond work index grinding equipment sizing

ball mill sizing with bond method work index base A comparison of the Bond method for sizing wet tumbling. · A comparison is made of the results from a ball mill model simulation with those of the conventional Bond ball mill design method, for a material whose breakage characteristics and Work Index have been determined.

CHAPTER 11 SIZE REDUCTION - NZIFST

Bond has suggested an intermediate course, in which he postulates that n is (-3/2) and this leads to: E = E i (100/L 2)1/2[1 – (1/q)1/2] (11.4) Bond defines the quantity E i by this equation. L is measured in microns in eqn. (11.4) and so E i is the amount of energy required to reduce unit mass of the material from an infinitely

ball mill specific energy calculator|Gold Crusher Machinery

How to Size a Ball Mill Design Calculator Formula. 15/05/2015 In this equation, E is the specific energy required for the grind, and F80 and P80 are the sizes in micrometers that 80% of the weight passes of the mill feed and product respectively The parameter Wi, known as the work index of the ore, is obtained from batch bench tests first devised by Bond (1961) The power …

Ball Mill Formulas And Calculations

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 solids or pulp density feed size as F80 and maximum 'chunk size' product size as P80 and.

Mill power for conical (Hardinge) type ball mills ...

Converting the measured shaft power on the mills to the equivalent power for the cylindrical section gave a variation of mill power per unit length with respect to mill diameter of n2 ·3, in agreement with the Bond mill power equation. However, the predicted mill power is 10% higher than that given by the Bond equation.

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Bond Work Index Formula-Equation

N = mill speed in RPM HP = A x B x C x L Where A = factor for diameter inside shell lining B = factor which includes effect of % loading and …

Mineral Processing - SlideShare

Wi = The Bond Ball Mill Work index ( 1952 )- is a measure of the resistance of the material to crushing and grinding . A Bond Ball Mill Work Index test may be required for the design of a new mineral processing plant . It is determined by Bond Ball Mill Grindability test in a lab using a Bond Mill.

ppt on ball mill calculation

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 % solids or pulp density, feed size as F80 and maximum 'chunk size', product size as P80 and maximum ...

Ball Mill Design/Power Calculation

C = distance of centre of gravity or charge from centre of mill in feet a = dynamic angle of repose of the charge N = mill speed in RPM HP = A x B x C x L Where A = factor for diameter inside shell...

bond index of grinding 」

Lastly, substituting all the values in equation 1 the Bond work index of the ore was determined to have a value of 41.38 kWh/tone. The Bond work index, in addition to it as being the measure of the materials hardness or resistance to crushing and grinding, gives an important indication of the efficiency of the machine being used.

CALCULATION OF THE POWER DRAW OF DRY …

in a specified laboratory mill. Then, using empirical equations developed by Bond, and later with minor revisions by Rowland, the mill size is determined (Rowland, 1985; Napier-Munn et. al., 1996; Man, 2000). Once, the size and ball load is determined, the power draw for a given mill is calculated using Equation 1. *

A mill power equation for SAG mills | SpringerLink

where m p is in kW; D is internal mill diameter (meters), L is internal mill length (meters); J is total fractional charge loading of the mill; J B is the fractional mill filling by balls; ε B is the effective porosity of the charge, taken as 0.3; ρ s and ρ b are true densities of rock and balls (tons per cubic meter), respectively; w c is the weight fraction of rock in water and rock in ...

CORRELATION BETWEEN BOND WORK INDEX AND …

Table 1 Bond mill charge distribution Ball diameter, inch No. of balls Distribution, % 1 ½ 25 8.8 1 ¼ 39 13.7 1 60 21.0 7/8 68 23.9 3/4 93 32.6 The standard Bond grindability test is a closed-cycle dry grinding and scree ning process, which is carried out …

labtech 3 inde bond ball mill

labtech 3 ball mill. labtech 3 bond ball mill. labtech 3 bond ball mill 3 index bond ball mill Gruppo Interforce area jonica Labtech 3 Index Bond Ball Mill krauss blumen Bond for 50 mm d 005 mm w is the work index measured in a laboratory ball mill kilowatthours per metric or short ton p 80 is the mill circuit product size in micrometers f 80 is the mill Labtech 3 ...

Powder metallurgy – basics & applications

discharge material is 40-10 mm. The mill speed varies from 12 to 30 rpm. Planetary mill: High energy mill widely used for producing metal, alloy, and composite powders. Fluid energy grinding or Jet milling: The basic principle of fluid energy mill is …

Bond F C Crushing And Grinding Calculations Allis Chalmers ...

Bond Index Mill For Grinding China 31538. bond index mill for grinding china 31538. bond index mill for grinding china 31538. Bond f c crushing and grinding calculations the fc bond mill was designed by f c bond for use in determining the bond index, a measure of grindability and power required for grinding .

AMIT 135: Lesson 7 Ball Mills & Circuits – Mining Mill ...

Bond developed a relationship that can be used to determine the percent charge by volume as a function of the vertical height above the charge, He, and the radius of the mill, R, i.e., Charge% = 113- (63H C /R) However, Morrell identified significant errors from this estimate when using small media sizes. Charged ball mill [image: (135-7-9)]

(PDF) Correlation Between Bond Work Index and Mechanical ...

The Bond work index Wi was calculated from Equation (2) Wi = 44.5/(P1)0.23 X (Gbp)0.82 [10/(P80)0,5 – 10/(F80)0.5] (2) Where: F80 is the size in (µm), at which 80 percent of the new feed to ball mill passes, P80 is the size in (µm), at which 80 percent of the last cycle sieve undersize product passes, and P1 is the opening in (µm), of the ...

Optimization of mill performance by using

Mill power Usually, plant operators use mill power readings as an indicator of ball filling degree and, often, try to keep it at the maximum level. It is well known that the mill absorbed power depends on operating parameters other than ball level, such as pulp density and liner configuration. Figure 2 shows that there is no linear relation between

A Review of Alternative Procedures to the Bond Ball Mill ...

In the Berry and Bruce procedure, 2 kg weight samples of the reference and unknown ores with a particle size under 1.651 mm are wet ground in a laboratory ball mill that is 305 mm in diameter, using active power monitoring. According to the Bond Third's Law of comminution (Equation (1); ), after performing both grinding tests with the same ...

Mill power for conical (Hardinge) type ball mills ...

Converting the measured shaft power on the mills to the equivalent power for the cylindrical section gave a variation of mill power per unit length with respect to mill diameter of D 2.3, in agreement with the Bond mill power equation. However, the predicted mill power is 10% higher than that given by the Bond equation.

Measurement of electrical energy consumption in a Bond ...

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 ore and balls and is. …

bonds law for crushing mills

bonds law for crushing . Bond S Law For Crushing Mills aquacristalfr. bond 3fs law for crushing mills Relationships between comminution J energy and product ball/rod mills and has become more likely a standard The general form of Bond''s equation is as follows: [6] where W is the work input (kWh/t); Wi is the work index (kWh/t) which expresses the resistance of the material …

Advances in Discrete Element Method Application to ...

ture was the advancement of Bond's formula (Bond 1961) for mill power prediction. The torque arm formula was the predominant theory (Hogg and Fuerstenau 1972; Guerrero and Arbiter 1960; Hlungwani et al. 2003). The torque needed to sustain the offset of the center of gravity of the charge from the mill center was being refined in many ways.

An alternative energy–size relationship to that proposed ...

Abstract Despite reservations of a number of researchers concerning the applicability of Bond's equation for relating specific energy to the size reduction of rocks, his approach has become an industry standard. Data from a large number of pilot and full-scale autogenous (AG), semi-autogenous (SAG) and ball mill circuits are used to show that Bond's equation does not hold …

INVESTIGATION OF PARTICLE BREAKAGE PARAMETERS IN …

in the Bond ball mill instrumented with a torque-measuring device. Different closing screen sizes were used in the locked-cycle work to produce different size distributions of the mill hold-up, and the operating conditions were changed in the one-size-fraction experiments to …

sag mills equation - acroschool.pl

Bond Mill Power Equation - YouTube ... LG A mill power equation for SAG mills. Minerals and Metallurgical Processing. Feb 1990 pp57-62. Gross power No load power Net power drawn by the charge (8.13) The net power is calculated from Net power KD2.5L e! c./ Watts (8.14) In equation 8.14, D is the diameter inside the mill liners and Le is the ...

A Method of C alculating Autogenous/ Semi-Autogenous ...

power 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