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# Magnetic separator

## Magnetic separator

(OP)
Hi everybody,

I´m new in magnets but i work in a facility with a magnetic drum (ferrite) to remove the iron from the agregates. Now we want to improve separation, reducing iron content in the agregates and we want to buy a new drum. The problem is that we dont have information about the field force of the current magnet or the magnet properties itself.
If we use a gausmeter we could know the magnetic field, is this correct? and then buy a more powerful ferrite.

thx

### RE: Magnetic separator

Distance is the biggest factor in magnetic attraction.  If you can make the layer of material thinner so that it is nearer to the magnet you will improve separation.  You could measure the field, or you could talk to the company that built yours.
Going wider and thinner will be the best.  Cutting the maximum distance from the drum in half is like having 4 times the field strength.

= = = = = = = = = = = = = = = = = = = =
Plymouth Tube

### RE: Magnetic separator

You could consider an electromagnetic solution whereby you could adjust the strength of the field.

For comparison purposes you could measure the pull or separating force that was required to separate a piece of iron/steel from your drum. A simple force gauge or spring gauge that could hold the peak measurement would do nicely.

Regards,

### RE: Magnetic separator

An electromagnetic drum is not likely an improvement over what he has. In the sizes of ferrite drums typically used for aggregate processing an electromagnetic solution is not available.

What you will be considering is a drum made with rare earth magnets. There are at least two different RE magnet circuits. One more or less duplicates the ferrite drum with magnets having a higher energy product. The other uses a bucking magnet sort of circuit for much higher strength.

When considering going to higher strength drums you must consider what you are trying to remove. If it is tramp iron then your capacity per unit length will not really suffer. But if it is fine iron than lower capacity is to be expected. If it is fine minerals like magnetite capture should be good. But if is hematite or one of the other rather weakly magnetic or paramagnetic minerals it may even be necessary to consider rare earth roll type separators. Perhaps you will not treat your entire volume but only a higher value product.

There are many good solutions out there for what you need. Any of the major vendors should be ready to help you. Find one with a good lab and you should be able to see your product run on several of the devices I mentioned.

If you need things more fully explained at that time maybe I can be the one to do that for you.

Mike

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