Crushing, Screening & Conveying

Crushing, Screening & Conveying2017-04-04T06:57:13-04:00
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law of comminution (3 replies)

3 years ago
fina 3 years ago

i have a question about law of comminution

in the book that i read there are 4 laws, rittinger, kick, bond and holmes.

for each law, they have their own constanta, but unlike bond that has bond's work index, i can not found rittinger and kick constanta list of material.

and what is the units of the equations?

does anyone have reference?
3 years ago
Robert 3 years ago
2 likes by fina and David


The energy size relationship is observed to have an exponent that varies as a function of particle size, e.g., see R. T. Hukki, “Proposal for a Solomonic Settlement between the Theories of von Rittinger, Kick and Bond,” Transactions on AIME, Vol. 220, 1961, pp. 403-408.

I've attached a copy of the related graphic from Hukki. 

Don’t forget Morrell’s approach which reflects this understanding.


For some comparative benchmarking information look at, Ballantyne, G.R. and Powell, M.S., Benchmarking comminution energy consumption for the processing of copper and gold ores. Minerals Engineering, 65, 2014, 109-114.

Benchmarking comminution energy for copper and gold ores

Alex Doll
3 years ago
Alex Doll 3 years ago
2 likes by fina and David

Robert is correct, there are a couple of other frameworks also out there. Be aware that Rittinger, Bond and Kick are all compatible within the framework of Hukki, but Morrell's model is incompatible (exponents don't follow Hukki).  I use both Bond and Morrell model, so you can make them work in spite of having very different exponents.

Regarding the Rittinger & Kick coefficients, you need to measure them for the material of interest.  There aren't any references I've seen where these are tabulated in the way that work index values are tabulated.  If you aren't performing material testing, then you shouldn't be using these models.

Be aware that the old tabulated work index values are on a short ton basis and the new tabulated work index values are on a metric tonne basis.  Check the units.

3 years ago
fina 3 years ago

very helpful answer, thank you!

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