Grinding & Classification Circuits

Grinding & Classification Circuits

  • To participate in the 911Metallurgist Forums, be sure to JOINLOGIN
  • Use Add New Topic to ask a New Question/Discussion about Grinding.
  • OR Select a Topic that Interests you.
  • Use Add Reply = to Reply/Participate in a Topic/Discussion (most frequent).
    Using Add Reply allows you to Attach Images or PDF files and provide a more complete input.
  • Use Add Comment = to comment on someone else’s Reply in an already active Topic/Discussion.

What is the correct way to determine solid % in the mill? (1 reply)

2 years ago
JuniorMet 2 years 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
2 years ago
Todd H 2 years 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

Please join and login to participate and leave a comment.