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PGM Plant Head Sample (3 replies)

Rahil Khan
9 months ago
Rahil Khan 9 months ago

I need some advice, in a PGM plant which one of the plants feed; mill feed or the PRF grade is the more accurate grade to determine the head grade?

Bill Rico
9 months ago
Bill Rico 9 months ago

It will depend on what you mean by plant feed, mill feed and what PRF (?) are defined as and how they are sampled. Can you give some more information on each measurement point (particularly particle top-size and method of sampling)?

John Koenig
9 months ago
John Koenig 9 months ago

The stream that has the least time-wise variation in grade and the smallest particle size is the best to sample long as you can get a 'correct' sample from the stream. The mills will provide some mixing/residence time that will assist in flattening the grade variation, so downstream of the mills is the place to sample, as long as you get only real fresh feed and no recycle streams (such as if the mill is in closed circuit).

9 months ago
OberstGruppen 9 months ago

I would suggest that the head grade to a PGM concentrator should be measured at the feed to your first stage milling depending on the configuration of the concentrator i.e. MF, MF2 etc. If you head grade sample is for metallurgical accounting then it should be the fresh feed to the concentrator before any recycled streams are added.

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