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Dry Concentrate Sampling (5 replies and 1 comment)

6 months ago
Bobson 6 months ago

Hi All,

Does anyone have experience with representatively sampling dry/moist concentrate?

After filtering, the concentrate is transported via conveyor belt (As usual).

There are several places to install a cross belt sampler, however, I have never worked with these samplers nor seen then employed in other operations for this duty. It seems that the conveyor profile must match the cutter trajectory which feels a little fiddly and hard to design correctly.

There are also places to install a cross stream sampler but I am not sure if this will function well with a concentrate which can be moist and clumpy. It seems likely that the sampler would be particularly prone to blockages.

Is it a fools errand to try and take a representative sample of dry (10% Moist!) concentrate?

Jorge Ganoza
6 months ago
Jorge Ganoza 6 months ago
1 like by David

It is possible to sample samples of filtered concentrates reporting a moisture content of 10%. I think, you should try to use a spear, or may be an auger. It is important to consider the total depth.

6 months ago
David 6 months ago

Hi Bob and welcome to 911met.

I have worked with multiple cross-belt sample cutters.  They are your cheapest alternative.  Insure you build that cross-belt cut on a flat section of your conveyor.

"Cross stream sampler" are those at the head-pulley?   They are rumoured to be the best most representative sample collection type.  They will cost you an arm + a leg however.

The cross-belt cutters I have worked with would cut and collect about 1 cup on concentrate every 20 minutes from a 1 meter wide belt carrying 40 TPH of 7 to 11% sphalerite concentrate.


Here is a sampler on a plant feed at 140 TPH https://www.911metallurgist.com/blog/cross-belt-sample-cutter


6 months ago

Hi David's
You have a very good site.
Is the sampler above for concentrate with dimensions less than 300 microns are also used?


6 months ago
David 6 months ago

Thank you soheil & welcome to 911Met.

Yes, this sampler will work on -300 microns concentrates.

6 months ago
Bobson 6 months ago


Thanks for the informative and quick response!

Yes, I was considering a cross stream sampler for a head pully/ transfer chute. But, as you say, it would probably be a more complicated (and expensive) bit of kit.

The cross-belt sampler seems to be the best option and it's encouraging that you have previously had good experience with them.



5 months ago
David 5 months ago

In comparison, this is a general arrangement drawing for a $300,000 head pulley sample cutter construction.


Also refer to https://www.911metallurgist.com/blog/types-models-sample-cutters

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