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Feed hydrometallurgical leaching operations are typically ground using a ball mill or rod mill, then through the classifier is larger than a certain size particles return regrinding, thus leached solids having a particle size range. This particle size range depends on a number of factors, including the mechanical properties of the material and the minerals it contains. The rate at which the target metal is leached from the feedstock is determined by the set chemical conditions and temperature, depending on the surface area of ​​the solid being immersed. It is therefore necessary to describe the continuous range of particle sizes and the particle size distribution in some way. This can be done by sieving. The weighed dry mill material is passed through a standard set of sieves and the weight of material remaining on each screen is weighed. The smallest screen used is typically 200 or 325 mesh with a mesh diameter of 75 μm or 45 μm. The weight of solids on each screen is converted to a cumulative mass fraction that is less than each given sieve diameter. Thus, the mass of the solid is expressed as a fraction (or percentage) of the sieve component having a particle size smaller than the mesh size. The mass fraction of a set of sieves is generally expressed in terms of the Schuhman equation:
y=(d∕K) m
Wherein the mass fraction of the y-particle size is less than d;
M-distribution constant;
K - another constant, called the amount of sieve modulus.
m and K are constant for a particular solid. The m and K values ​​of the ore can be determined by plotting lgy against lgd.
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