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Laws Governing Size Reduction

Several empirical Laws Governing Size Reduction describe the energy required for size reduction:

Laws Governing Size Reduction
Laws Governing Size Reduction

Laws Governing Size Reduction

1. Rittinger’s Law:

  • Suggests that the energy required for size reduction is directly proportional to the new surface area generated.

  • where

    • E = energy required

    • Kr = Rittinger's constant

    • D1 = initial particle size

    • D2 = final particle size

  • Applicable for fine grinding where the creation of new surface area is significant.

2. Kick’s Law:

  • Proposes that the energy required for size reduction is proportional to the size reduction ratio.

  • Where

    • E = energy required

    • Kk = Kick's constant

    • D1 = initial particle size

    • D2 = final particle size

  • Best for coarse crushing where the size reduction ratio is small

3. Bond’s Law:

  • Combines the aspects of Rittinger’s and Kick’s laws and states that the energy required is proportional to the reduction in particle size based on the work index of the material.

  • where

    • E = energy required

    • Kb = Bond's constant

    • D1 = initial particle size

    • D2 = final particle size

  • Suitable for intermediate grinding processes


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