The work index in Bond's law for crushing of solids has the following dimensions a) No units (dimensionless) b) KWh/ton c) KW/ton d) KWh.m 1/2 /ton

May 14, 2010· Where Kb is a constant that depends on the type of machine and on the material being crushed. To use this equation, a work index Wi is defined as the gross energy requirement in kilowatt-hours per ton of feed needed to reduce a very large feed to such a …

Crushing of mineral particles is accomplished in a 'cage mill', when one or more alloy steel bars are revolved in opposite directions. It is a type of _____ mill. a) Impact b) Roll c) Vibratory d) None of these

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 to crushing and grinding; and F80 and P80 are the 80% passing size of the feed and the product ( m), respectively.

predictions for ball mills typically use the following form of the Bond equation ... 3.2.2 Bond crushing law and work index. What is bond's law of crushing - Wiki Answers Where Kb is a constant that depends on the type of machine and on the material being crushed. To use this equation, a work index Wi is defined as the gross ...

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The 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 …

The objective of this report is to provide the details of size reduction methods involved in mineral processing using crushing equipments. ... rod m ills and ball mills, ... that bond together ...

Bond Work Index Tests. Grinding Solutions offers a range of Bond Work Index Testing from crushability and abrasion to ball and rod mills. For more information on the tests please see below: Bond Low Energy Impact Test. The Bond Low-Energy Impact test can be used to determine the Crusher Work index (CWi), also known as the Impact Work Index.

bond 3fs law for crushing mills Verbion Handel. Bond Ball Mill Index Test JKTech. A Bond Ball Mill Work Index may also be used in the simulation and optimisation of existing mill(s) and the associated grinding circuit(s). Sample Requirements: A minimum of 10 kg of …

Oct 10, 2014· • Bond has suggested a law intermediate between Rittinger's and Kick's laws, by putting p = −3/2 in the general equation: • Writing C = 5Ei then: • Bond terms Ei the work index, and expresses it as the amount of energy required to reduce unit mass of material from an infinite particle size to a size L2 of 100 μm, that is q =∞. 7.

Oct 13, 2018· 1. Kick's Law 2. Rittinger's Law 3. Bond's Law Watch this full video to learn this b.pharma subject online, which comes under unit operation in pharmaceutical engineering. Other Topics in Size ...

Jun 02, 2017· Bond's Law states that the total work input represented by a given weight of crushed product is inversely proportional to the square root of the diameter of the product particles. Bond's Law can be written as: ... Hammer mills can be used for coarse crushing or fine grinding, depending on the size and configuration. Hammer mills are ...

* Bond F. C., "Crushing Tests by Pressure and Impact", Trans AIME, Vol 169, 1947, pp 58-66. Bond 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.

Comparison between bond crushing energy and fracture energy of rocks in a jaw crusher crusher were studied, and the results were discussed with respect to the fracture behaviour modelled by PFC3D software. Then, the determined work done by the jaws of the crusher were compared with those of the Bond crushing

AG/SAG mills can accomplish the same size reduction work as two or three stages of crushing and screening, a rod mill, and some or all of the work of a ball mill. Because of the range of mill sizes available, AG/SAG milling can often be accomplished with fewer lines than in a conventional rod mill/ball mill circuit. A diagram of types of AG/SAG ...

Rittinger's, Kick's and Bond's laws express work input as work index (W i) times a particle size function. It is proposed that these laws are only particular cases of more general expressions having the particle size function raised to an exponent, i.e., the work exponent (W e).

The Bond work index is not solely a material constant but is influenced by the grinding conditions. For example, the finer the grind size desired, the higher is the kWh/t required to grind to that size. Magdalinovic [38] measured the Bond work index of three ore types using different test screen sizes. He produced a correlation between the mass of test screen undersize per revolution, G, and ...

Marcy mills are recommended to operate a peripheral speeds governed by the following relationship : ... the rotational speed can be determined. 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. ... Equal Employment Opportunity is the Law ...

A crusher was used to crush a material with a feed size of -5.08 cm +3.81 cm and the power required was 3.73 KW/ton. The screen analysis of the product was as follows:What would be the power required to crush 1 ton/h of the same material from a feed of - 4.44 cm + 3.81 cm to a product of average product size 0.051 cm? Use Rittinger's law.

The work index in bonds law for crushing of solids hasthe work index in bonds law for crushing of solids hasThe work index in bonds law for crushing of solids has the following dimensions a no units dimensionless b kwhton c kwton d kwhm 12 ton, bonds law for crushing mills

Note that the definition of particle size in Bonds law is different: D80= Particle size such that 80% by weight of the sample is smaller than it. Bonds law is often written in terms of the work index (Wi) as, Where the work index is defined as the energy required per unit mass in kWh/ton to reduce an infinitely large particles to D80 = 100 μm.

Equation (11.2) is a statement of Kick's Law. It implies that the specific energy required to crush a material, for example from 10 cm down to 5 cm, is the same as the energy required to crush the same material from 5 mm to 2.5 mm. ... in which large areas of new surface are being created, Rittinger's Law fits the experimental data better. Bond ...

b = Correction factor for pebble crushing T 80 = Mill transfer size, 80% passing (µm) W BM = Ball mill specific energy from T 80 1.7 mm to final product P 80, using Bond's Law, (kWh/t) W T = Total grinding mill circuit specific energy (kWh/t) Note that K BM is the composite of EF3, EF4 and EF5 factors for ball milling (Rowland, 1982).

Metallurgical ContentThe Two Laws:What about Bond?Rittinger's Law:The Crushing-Surface Diagram: Rittinger's theory and law of the energy expended in crushing of rock is that the work of crushing is proportional to the reduction in diameter; or, as I have more fully expressed it: "The work done in crushing is proportional to the surface exposed by the operation; or, better expressed for ...

Jan 01, 2016· During manual crushing and disintegration of a rock with a hammer, or during mechanical crushing operations, the size reduction of large sized rocks and ores is mostly by sharp impact action, and less so by the impact and attrition experienced in tumbling mills. The equation used by Bond is inappropriate to determine the energy required for ...

Bond Impact Crushing Work Index Test. Bond s law for crushing mills. Bond f c, crushing tests by pressure and impact, trans aime, vol 169, 1947, pp 58-66 bond rod mill grindability test the test determines the bond rod mill work index which is used with bonds third theory of comminution to calculate net power requireme...

range. This study illustrated that Kicks law was applicable in the crushing range (above 1 cm in diameter) . Bond's theory was more suited to the particle size ranges involved in conventional ball and rod mill grinding (5 to 250 mm). Rittinger's law showed more _app1icability to the fine

Oct 25, 2016· • Kick's law • Rittinger's law • Bond's law 11. Kick's law 2 1 ln d d KE K KK = Kick's constant, d1 (m) = the average initial size of pieces, d2 (m) = the average size of ground particles. d1/d2 = the size reduction ratio (RR) and is used to evaluate …

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