Autogenous grinding method
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United States of America Patent
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Jul 21, 1987
Issued Date -
N/A
app pub date -
Mar 18, 1986
filing date -
Nov 27, 1981
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The present invention relates to a method for comminuting a coarse lump mineral material in an autogenous grinding system, in which feed to the grinder is divided into a coarse fraction and a fine fraction. The coarse fraction is coarser than the inflection point on the coarse side of the knee of the particle size distribution curve of the charge of said autogenous grinder; the fine fraction is substantially all finer than the point of intersection between two tangents drawn between the adjacent inflection points on either side of the knee of the particle size distribution curve of the charge. The ratio between the amounts of fractions is determined on the basis of achieving a given charge quantity for a particular, selected set point power value for the mill in question, and determined with respect to a selected degree of grinding. Grinding efficiency is greatly increased by selecting feed sizes in accordance with the present invention.
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