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Swebrec function

The Swebrec function is a new three-parameter fragment size distribution, which ties together rock fragmentation by blasting and crushing. It gives excellent fits to hundreds of sets of sieved fragmentation data with correlation coefficients of usually r{2} = 0,995 or better over a range of fragment sizes of 2-3 orders of magnitude.

A five-parameter version reproduces sieved fragmentation curves all the way into the 100-micron range and also handles ball mill grinding data. Further, the Swebrec function:
- Plugs right into the Kuz-Ram model and removes two of its drawbacks, the poor predictive capacity in the fines range and the upper limit cut-off to block sizes,

- Reduces the JKMRC’s one-family description of crusher breakage functions based on the t10 concept to a minimum;

- Establishes a new family of natural breakage characteristic (NBC) functions with a realistic shape that connects blast fragmentation and mechanical comminution and offers new insight into the working of the Steiner’s OCS sub-circuits of mechanical comminution.

It is suggested that the extended Kuz-Ram model, with the Swebrec function replacing the Rosin-Rammler function, be called the KCO model.

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Reported by

Swebrec at Lulea Technical University of technology
10074 Stockholm
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