Sizing a crusher can be done reliably calculated thanks to the ImpactCrushing Work Index and the testwork research done by Fred Chester Bond and his 1952 paper. According toBonds Third Theory of Comminution the workenergy input is proportional to the new crack tip length created during particle breakage and equivalent to the work represented by the product 8211 the feed.Get A Quote
Sizing a crusher can be done reliably calculated thanks to the ImpactCrushing Work Index and the testwork research done by Fred Chester Bond and his 1952 paper. According toBonds Third Theory of Comminution the workenergy input is proportional to the new crack tip length created during particle breakage and equivalent to the work represented by the product 8211 the feed.
A crude test procedure description of this Crushability test follows in that rock samples smaller than 75 mm but greater than 50 mm are placed 2 8220hammers8221 of 13.6 kg each and mounted to swing on bicycle wheels. Both hammers of the 8220pendulum8221 will impact the smallest measured side on the rock. The hammers are set to fall again from a higher drop position to input enough energy to break the rock. This is done 10 times to obtain 10 breaks and the WI kWht 53.49 x Impact Crushing Strength Specific Gravity of the sample. jktech.com.au
Compare and Understand RodBallImpact-CrushingAbrasion BOND Work Index
The test determines the Bond Impact Work Index which is used with Bonds Third Theory of Comminution to calculate net power requirements when sizing crushers. It is also used to determine the required open-side settings jaw crushers and gyratory crushers or closed-side settings cone crushers for a given product size.
Where Oss Open-side setting in inches Css Closed-side settings in inches Ecc Eccentric throw in inches P80 Aperture through which 80 of the product will pass. Wi Work Index
The impact apparatus consists of two pendulum-mounted hammers mounted on two bicycle wheels so as to strike equal blows simultaneously on opposite sides of each rock specimen. The height that the pendulum is raised is increased until the energy is sufficient to break the specimen.
Feed Sample RequirementsAt least 10 pieces of minus 3 plus 2 ore 20 pieces recommended.Also see another procedure and Work Index result table.
Here a Summary Table of several crushing work index tests performed by 8216others8217 including old Nordberg.
The energy required to liberate a mineral of economic interest from its gangue constituents in the host rock is described in this chapter. The design of equipment use for the purpose is indicated in some details. Standard laboratory tests for determining this energy are described for ball and rod mills systems of grinding. The methods of calculating this energy is illustrated with worked examples.
Jan 01 2016nbsp018332Bonds crushing work index of gypsum. 3.4. A sample of granite passing a 7.5 cm square opening screen was suspended in a Bonds pendulum test. The length of the pendulum was 413 mm and the mass of hammers is 13.6 kg each. The sample was completely crushed when the initial position of the pendulums made an angle of 30176 with the vertical.
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Bonds 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 bonds 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 crushing law in ball mill the data bond found there was an approximately fixed factor between the third law value for each of crushing rod milling and ball milling each over their
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