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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Removing Clay in Scrubber (9 replies)

Oberfuhrer
2 years ago
Oberfuhrer 2 years ago

Is there any suggestions regarding the chemical can be used in the scrubber when washing feldspar (size 6 mm) to remove the clay content.

Maya Rothman
2 years ago
Maya Rothman 2 years ago

Sodium silicate or caustic can assist in dispersion of the clay.Issue to consider:

  • Amount of clay present. The use of 2 stages of scrubbing followed by classification can be useful if the clay content is very large.
Oberstorm
2 years ago
Oberstorm 2 years ago

Do you have any data about the water chemistry? Softening the water will help with dispersion. Another dispersant to consider using would be a poly acrylate acid.

Maya Rothman
2 years ago
Maya Rothman 2 years ago

Would you be able to advise us on the clay content, clay type or if any experiments had been run?

Oberfuhrer
2 years ago
Oberfuhrer 2 years ago

It is a surface coating and goes easily by washing and fired color improves in ceramic after this washing. My intention is to accelerate this washing process and remove clay completely for increasing fired whiteness.

Let me do some test in couple of days and will update.

Marshal Meru
2 years ago
Marshal Meru 2 years ago

I agree with the comments above that its very clay dependent. Here is another idea.

A few weeks ago I got to visit a potash plant and they handled their clay problem in a very different way to what I had seen before. In their rotary conditioner prior to the float (basically a rotary scrubber) they put in an additive to agglomerate the clay. The feed to the conditioner was approximately 2-4mm. The challenge was then to remove the agglomerated product; in this case it didn't float so it worked well.

Maya Rothman
2 years ago
Maya Rothman 2 years ago

That was a novel approach at the potash plant. Can you comment on process selection for removal of the agglomerated product?

Oberfuhrer
2 years ago
Oberfuhrer 2 years ago

What is the additive which makes clay to agglomerate and ours also rotary scrubber.

Marshal Meru
2 years ago
Marshal Meru 2 years ago

The agglomerated clay is significantly larger than the individual particles hence doesn't report to the float conc. and is thus rejected. In this particular case I'm not sure how this would work perhaps if there is a size differential with the feldspar you could screen off after the scrubber? At least if it is agglomerated it shouldn't stick to the feldspar particles....

Sorry I can't comment on what chemical is used for the agglomeration but I'm sure if you talk with the chemical vendors they may be able to help you.

Standartenfurer
2 years ago
Standartenfurer 2 years ago

Have you considered an Attrition Scrubber? It liberates clay particles. No chemicals needed. Have a look at Metso Minerals website. (i.e. http://www.metso.com)

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