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### 11 Crushing and classification

where Wi is the Bond Work Index again in energy per unit mass terms. The index is defined as the energy required to crush from infinite size down to 100 µm hence the 10 inside the brackets. Bond s Work Index values in kWh per short ton i.e. 2000 lbs or 907 kg roughly follow the Moh s scale of hardness see Table 11.1.

Get Price### FM 306 SIZE REDUCTION AND SIEVINGIIT Bombay

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. In the above equation unit of D80 is in mm of W is kWh and of m is in ton. Work index for common materials is Material Wi (kWh/ton)

Get Price### MECHANICAL OPERATION LAB MANUAL

To determine the crushing law constants using Blake jaw crusher Experimental setup. THEORY Crushers are slow speed machines for coarse reductions and can break large lumps of various hard materials as in the primary and secondary reduction of rocks and ores. Work Index Bond s law constant) Wi= E ÷ 1/

Get Price### FM 306 SIZE REDUCTION AND SIEVINGIIT Bombay

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. In the above equation unit of D80 is in mm of W is kWh and of m is in ton. Work index for common materials is Material Wi (kWh/ton)

Get Price### Based on Bonds Crushing Law the power required to crush a

• Based on Bond s Crushing Law the power required to crush a certain material will change by if the diameter of the product is made smaller by 50 . • In crushing a certain ore the feed is such 80 is less than 50.8 mm in size and the product size is such that 80 is less than 6.35 mm.

Get Price### CORRELATION BETWEEN BOND WORK INDEX AND

meaning is expressed include the Rittinger number crushing resistance Hardgrove index and Bond work index. The Bond work index is regarded as one of the crushing resistance it can therefore be presumed that the Bond work index is correlated to the mechanical properties of materials 4 .

Get Price### Mechanism of size reductionSlideShare

Jan 23 2013 · Bond s law 30. Bond s law 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 =∞. The size of material is taken as the size of the square hole through which 80 per cent of the material will pass. 31.

Get Price### Size reduction (GIKI)SlideShare

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.

Get Price### Comminution Hazen Research

This test determines the Bond Rod Mill Work Index which can be used with Bond s Third Theory of Comminution to calculate net power requirements of sizing rod mills. The test is a closed-circuit dry grindability test is run in a standard rod mill and can be performed at sizes ranging from 4.76 mm to

Get Price### Bond Work Index Formula-Equation

Basic Equations Get Price### A New Approach to the Calculation of Work Index and the

1 according to Bond 2 n = 0.5 and according to Charles 3 and Stamboliadis 4 n. can take any value near these two. In the case that the initial size is infinite and the final size is 100 μm then by definition the required specific energy is called work index . W. i 100 e W. i (2) The value of the constant . C. in (1) can be calculated

Get Price### Relationships between comminution J energy and product

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. Bond developed a standard laboratory test for the determination of the work index for ball and rod mills in

Get Price### Orway Mineral Consultants Canada Ltd. Mississauga ON

MacPherson correlated Autogenous Work Index (AWi). A particle size analysis of the mill ore charge at the end of the tests provides insight into the build up of critical sized material within the mill. The AWiis used in conjunction with other Bond Work Indices (CWi RWi BWi) to determine power requirements using Bond s Third Law of Comminution.

Get Price### CORRELATION BETWEEN BOND WORK INDEX AND

meaning is expressed include the Rittinger number crushing resistance Hardgrove index and Bond work index. The Bond work index is regarded as one of the crushing resistance it can therefore be presumed that the Bond work index is correlated to the mechanical properties of materials 4 .

Get Price### MECHANICAL OPERATION LAB MANUAL

To determine the crushing law constants using Blake jaw crusher Experimental setup. THEORY Crushers are slow speed machines for coarse reductions and can break large lumps of various hard materials as in the primary and secondary reduction of rocks and ores. Work Index Bond s law constant) Wi= E ÷ 1/

Get Price### Based on Bonds Crushing Law the power required to crush a

• Based on Bond s Crushing Law the power required to crush a certain material will change by if the diameter of the product is made smaller by 50 . • In crushing a certain ore the feed is such 80 is less than 50.8 mm in size and the product size is such that 80 is less than 6.35 mm.

Get Price### Bond Impact Crushing Work Index -Procedure and Table of

Sizing a crusher can be done reliably calculated thanks to the Impact/Crushing Work Index and the testwork research done by Fred Chester Bond and his 1952 paper. According to Bond s Third Theory of Comminution the work/energy input is proportional to the new crack tip length created during particle breakage and equivalent to the work

Get Price### CORRELATION BETWEEN BOND WORK INDEX AND

meaning is expressed include the Rittinger number crushing resistance Hardgrove index and Bond work index. The Bond work index is regarded as one of the crushing resistance it can therefore be presumed that the Bond work index is correlated to the mechanical properties of materials 4 .

Get Price### FM 306 SIZE REDUCTION AND SIEVINGIIT Bombay

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. In the above equation unit of D80 is in mm of W is kWh and of m is in ton. Work index for common materials is Material Wi (kWh/ton)

Get Price### Size reduction (GIKI)SlideShare

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.

Get Price### QUICK METHOD FOR BOND WORK INDEXAPPROXIMATE

Abstract The Bond work index is a measure of ore resistance to crushing and grinding and is determined using the Bond grindability test. Its value constitutes ore characteristic and is used for industrial comminution plants designing. Determining the Bond work index

Get Price### Comparison of UCS to Bond Work Indices

FIGURE 1 BOND CRUSHING WORK INDEX v. UNCONFINED COMPRESSIVE STRENGTH 0 100 200 300 400 UCS MPa 10 20 30 40 50 WiC (metric) The scatter of the points in Figure 1 indicates no correlation between crushing work index and UCS.

Get Price### Chemical Engineering Stop Bond s law

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

Get Price### Rittinger s Kick s and Bond s Crushing LawsYouTube

Feb 03 2018 · Enjoy the videos and music you love upload original content and share it all with friends family and the world on YouTube.

Get Price### SIZE REDUCTIONUniversiti Teknologi Malaysia

Rittinger s law work required in crushing is proportional to the new surface created P = power required P m. K r 1 D sb 1 D sa a= feed rate m Ý = volume-surface mean dia. of feed product respectively D sa D sb K r = Rittinger s coefficient K r 6e s c m p 1 b 1 = crushing efficiency C = ratio of energy absorbed to energy input m p

Get Price### 4. SIZE REDUCTION

In case of crushing a classical law known as Kick s law is best suited P = 𝑚̇𝐾 log 𝐴𝑤2 𝐴𝑤1 (4.4) A more useful relation that can be used for both crushing and grinding has been obtained by Bond (1952). This law introduces two new concepts namely "The Bond diameter D

Get Price### 4. SIZE REDUCTION

In case of crushing a classical law known as Kick s law is best suited P = 𝑚̇𝐾 log 𝐴𝑤2 𝐴𝑤1 (4.4) A more useful relation that can be used for both crushing and grinding has been obtained by Bond (1952). This law introduces two new concepts namely "The Bond diameter D

Get Price### Bond Work Indexan overview ScienceDirect Topics

The Bond work index (Bond 1960) is based on Bond s law which states that the energy consumed is proportional to the 1.5 power of particle size rather than the square of Rittinger s law. Accordingly the energy consumed in reducing the particle size from x F to

Get Price### Mechanism of size reductionSlideShare

Jan 23 2013 · Bond s law 30. Bond s law 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 =∞. The size of material is taken as the size of the square hole through which 80 per cent of the material will pass. 31.

Get Price### Bond Work Index TestsGrinding Solutions Ltd

Bond Rod Mill Grindability Test. Grinding Solutions can carry out Bond Rod Mill Work Index tests to determine the energy requirements for milling ore in a rod mill. The test requires a minimum of 20kg of -12.5mm material. Closing screen sizes typically range from 4.75mm to 212µm. Abrasion Index Test

Get Price### FM 306 SIZE REDUCTION AND SIEVINGIIT Bombay

### Mechanism of size reductionSlideShare

Jan 23 2013 · Bond s law 30. Bond s law 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 =∞. The size of material is taken as the size of the square hole through which 80 per cent of the material will pass. 31.

Get Price### Size Reduction and Energy RequirementScienceDirect

Jan 01 2016 · As the initial velocity of the rebound block pendulum is zero applying Newton s law of conservation of energy Bond s crushing work index of gypsum. 3.4. A sample of granite passing a 7.5 cm square opening screen was suspended in a Bond s pendulum test. The length of the pendulum was 413 mm and the mass of hammers is 13.6 kg each.

Get Price### Comparison between bond crushing energy and fracture

the Bond index. There is considerable difference between Bond crushing energy and work done by the jaw crusher for rocks. It using a force-displacement law for each contact1. The rock is modelled as an assembly of stiff particles (balls) that are bonded together. The properties of the bonds between balls

Get Price### USING THE SMC TEST® TO PREDICT COMMINUTION

The work index covering grinding in tumbling mills of coarse sizes is labelled M. ia. The work index covering grinding of fine particles is labelled M. ib (Morrell 2008). M. ia. values are provided as a standard output from a SMC Test ® (Morrell 2004. a) whilst M. ib. values can be determined using the data generated by a conventional Bond

Get Price### A New Approach to the Calculation of Work Index and the

1 according to Bond 2 n = 0.5 and according to Charles 3 and Stamboliadis 4 n. can take any value near these two. In the case that the initial size is infinite and the final size is 100 μm then by definition the required specific energy is called work index . W. i 100 e W. i (2) The value of the constant . C. in (1) can be calculated

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