Grinding & Classification Circuits

Grinding & Classification Circuits2018-06-17T09:51:34-04:00
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Tin Ore Classification (1 reply and 1 comment)

Jorge Quintanilla
2 months ago
Jorge Quintanilla 2 months ago

Tin Ore Classification 

One of the most recent tin projects in Bolivia involves the classification into four ranges:
1. -1,800 micron +850 micron
2. - 850 micron +212 micron
3. -212 micron +45 micron
4. -45 micron +30 micron
To obtain this classification after the primary mill it was defined in basic engineering to use a hydraulic classifier. I do not have many successful references regarding this type of classification. I am more familiar with cyclones and screens. Could someone give me more lights about it?
We thinking about a new singular combination of process.
First :
Double deck vibrating screen with three products
1st + 1,800 microns to the rod mill
2nd -1,800 microns +850 micron to spirals
3th -850 microns to the hydrociclon clasification

In the hydrociclon we obtaine:
OF 80% -44 microns
UF to the hydraulic two cameras classifier.
1st -850 microns +212 microns
2nd -212 microns +45 microns

What is Your opinion about it?

Jorge Quintanilla

Alex Doll
2 months ago
Alex Doll 2 months ago

Hydraulic classifiers separate minerals in a slurry flow, based on Stoke's Law.  These can be rake classifiers, spiral classifiers (https://www.911metallurgist.com/equipment/spiral-classifier/) and settling cones.

Hydrocyclones have fine material locked in the water phase of the underflow (the coarse phase); hydraulic classifiers usually drain away the water from the coarse phase so that there are no fines.  In your application, hydrocyclones are probably appropriate for closing the grinding stage, but should be avoided to do the coarse/fine split ahead of your spirals or tables because any fine tin that is carried into the coarse split will be lost, causing lower recovery than if you used spiral or other classifiers that drain away the fines & water from the coarse product.

Jorge Quintanilla
2 months ago

Excellent observation. I appreciate the comment that helps us in making decisions

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