Laboratory Testing & General Mineral Processing Engineering

Laboratory Testing & General Mineral Processing Engineering

  • To participate in the 911Metallurgist Forums, be sure to JOIN & LOGIN
  • Use Add New Topic to ask a New Question/Discussion about Mineral Processing or Laboratory Work.
  • 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.

Dry Concentrate Sampling (5 replies and 1 comment)

R
Bobson
8 years ago
Bobson 8 years 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?

J
Jorge
8 years ago
Jorge 8 years ago
Like
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.

David
8 years ago
David 8 years ago
Like

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.

Fancy! 

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

belt-sampler

Use the Social Share Bar on the Left. Tell everyone you can about https://www.911metallurgist.com/metallurgy/ It's FREE & GOOD.

M
soheil8
8 years 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?

thanks.

David
8 years ago
David 8 years ago
Like

Thank you soheil & welcome to 911Met.

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

Use the Social Share Bar on the Left. Tell everyone you can about https://www.911metallurgist.com/metallurgy/ It's FREE & GOOD.

R
Bobson
8 years ago
Bobson 8 years ago
Like

David,

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.

 

 

David
8 years ago
David 8 years ago
Like

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

head_pulley_sample_cutter

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

Use the Social Share Bar on the Left. Tell everyone you can about https://www.911metallurgist.com/metallurgy/ It's FREE & GOOD.

Please join and login to participate and leave a comment.