Grinding & Classification Circuits

Grinding & Classification Circuits2018-06-17T09:51:34-04:00
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What is the correct way to determine solid % in the mill? (1 reply)

6 months ago
JuniorMet 6 months ago

Hi colleagues. I want to know what is the percent solids we are working at, inside the sag mill. Should I sample the pulp discharged to the sump and measure % solids there? How can I calculate the solids percent using the circulating load or the overflow and underflow percent solids?

Todd H
6 months ago
Todd H 6 months ago

It is always best if you can measure the solids directly but it is not always possible plus on a SAG there is often a trommel and a screen in the way.  You need to measure all the flows and the sump may or may not contain the coarse material depending on your configuration.

You can measure it indirectly in a number of ways such as cyclone feed density less water added in the SAG discharge, cyclone overflow and underflow less water added - dont forget pebbles.  I have been doing this for a long time and I still develop a small mass balance around the circuit using first principles when I want to figure something out.


Todd Harvey - Global Resource Engineering

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