Dewatering: Thickening, Filtering, CCD, Water Treatment & Tailings Disposal

Dewatering: Thickening, Filtering, CCD, Water Treatment & Tailings Disposal 2017-04-04T06:57:46+00:00
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Cyclone Sizing (3 replies and 3 comments)

Boyd
6 months ago
Boyd 6 months ago

Hello everyone,

i need help with the size of cyclone i can install to act as a bypass to the overloaded concentrate thickener and avoid dirt overflow. Basicaly i want to split the feed to thickener in 40% to 60% or what ever percentage of feed to go to the underflow at 65% solids and this will be ready to feed the filter, while the cyclone overflow goes to the thickener to be thickened and attain a density of 65% solids before filtration. The following are the parameters:

Cyclone Feed; 15% to 35% solids, 35m3/h flowrate, 80% passing 45um.

Under Flow; 65% solids.

adrianh
6 months ago
adrianh 6 months ago
Boyd
6 months ago

Hi Adrianh, i really appreciate you so much for sending this useful link

Romain CADENAT
6 months ago
Romain CADENAT 6 months ago

Hi Boyd

Your feed in thin (80%<45µm) so you should use small hydrocyclone. Maybe a cluster of 2 or 3 small HC. 

However I have one comment: you say that the overflow is not clear. Usually the particles in the overflow are the smallest particles (from 0 to 10µm). Bigger particles settle quickly and goes to the underflow.

If you use a hydrocyclone, you will be able to separate at 20µm (maybe less) but the thinest particles would still go in overflow. 

For the design of hydrocyclone I would suggest that you give your data to a manufacturer and they will do the design for you (list of renowned manufacturer such as Neyrtec Mineral (France), Krebs (FLS) (Sweden), Weir (England), Outotec (Finland), AKW (Germany), Multotec (South Africa) and many others). 

Boyd
6 months ago

Hi Romain, i appreciate you for the insight and suggested manufacturers

Dane Smith
6 months ago
Dane Smith 6 months ago

Hi Boyd,

I have a few comments:

  • Are you sending your thickener underflow to a filter? If so, what kind of filter and what excess capacity do you have?
  • In my experience, the above flow sheet change will typical mean a lower overall density, particularly with a stream as fine as yours. Hence the above question (cake form is related to feed desnity exponentially).
  • Removal of the coarser material will mean a much lower density thickener underflow and a much higher chance of poor overflow quality as you are essentially losing the "ballast" for your agglomerates
  • You will also likely see a much higher flocculant usage 
  • You will likely see much more froth generation on the thickener surface.

i would highly suggest you have a cyclone manufacturer model your proposed idea, then have a thickener OEM do testwork on the thickener feed stream with a baseline Vs modified scenario. I think you'll find your proposed solution wont get you what you want.

I think there are a number if reasons why you are likely struggling at the moment:

  • old thickener design and poor feed system performance
  • Under designed thickener (if new)
  • incorrect flocculant choice

I would highly suggest all of these be investigated prior to the cyclone mods.

 

Cheers,

Dane

 

Boyd
6 months ago

Thanks Dane for your valuable comments, actually the design of the thickener is somehow not correct and i want to find the cheaper means to over come the current design of the thickener.

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