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Basic EquationsSize Distribution and Exposure RatioEquations For Work Index VariationsWork Index and Crack EnergyThe basic work index equation is: W = 10 Wi/√P – 10 Wi/√F…………………………………………………………………………(1) where W is the work input required in kilowatt hours per short ton to grind from 80% passing F microns to 80% passing P microns, and Wi is the work index, or the grinding resistance parameter. It represents the energy input required in kilowatt hours to reduce a short ton from theoret…

11/03/2016· The mathematics of this theory follow: Assume a cube of rock (Fig. 2) of side D, divided into smaller cubes by planes passing through it in three directions, as shown. The surface of the original cube being 6D 2, the aggregate surface of the smaller cubes will be 6ND 2, and the new surface exposed will be 6 (N — 1)D 2.

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 …

processing the material by crushing. This means that a good percentage of the stone will be fractured in the crushing process.The broken stones will embed into the surface of a gravel road much better than rounded, natural-shaped stone. It also means that the material resists movement under loads better and gives better strength

Option 1 – For optimum performance, install 4 to 6 in. of 0-3/4″ crushed stone, then compact using a vibratory plate compactor. Option 2 – Install 2 to 4 in. of 0-3/4″ or 0-3/8″ or 0-1/4″ or 0- 3/16″, then compact using a vibratory plate compactor. In restricted areas where a …

26/07/2021· Use this formula to determine how much crushed stone you will need for your project: (L'xW'xH') / 27 = cubic yards of crushed stone needed. In the construction world, most materials are measured in cubic yards. Multiply the length (L), in feet, by the width (W), in feet, by the height (H), in feet, and divide by 27.

10/10/2014· • Kick’s law: – putting p = −1, then integration gives: – Writing C = KKfc, then Kick’s law, is obtained as: – This supposes that the energy required is directly related to the reduction ratio L1/L2which means that the energy required to crush a given amount of material from a 50 mm to a 25 mm size is the same as that required to reduce the size from 12 mm to 6 mm. • Bond’s Law: – Neither of these two laws permits an accurate calculation of the energy …

The power predictions for ball mills typically use the following form of the Bond equation: E = 10 W ( 1 P 80 − 1 F 80 ) {\displaystyle E=10W\left({\frac {1}{\sqrt {P_{80}}}}-{\frac {1}{\sqrt {F_{80}}}}\right)\,}

13/03/2015· Various theories for energy requirement are:- Rittinger’s theory Kick’s theory Bond’s theory. 17. 18. Integrating equation (1), E= C ln(di/dn) …. (2) (di/dn) = reduction ratio. If n=1.0 equation (2) becomes Kick’s theory. If n=1.5 equation (2) becomes Bond’s theory. If n=2.0 equation (2) becomes Rittinger’s theory. 19.

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