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Is Flocculent detrimental to extraction (4 replies)

Sugar Watkins
10 months ago
Sugar Watkins 10 months ago

Using clarifier to remove solid particles from PLS before feeding to SX process needs flocculent or not? Isn't flocculent harmful for extracting in extraction stage?

John Koenig
10 months ago
John Koenig 10 months ago

Typically in an acid leach system non-ionic flocculants are used in the post leach and CCD thickeners, and this does not have a direct negative effect on the chemistry of the SX organic. Where it probably does have an effect is in crud generation - producing a more viscous crud.

That said our work on clarification shows that adding flocculent to a stream with very low solids has very little effect on the solids and the clarifier operation is generally poor. You will be lucky to get more than 60% TSS removal.

Can you elaborate on your process and where the clarifier fits into the circuit?

Zander Barcalow
10 months ago
Zander Barcalow 10 months ago

To use flocculent in the process is to remove the slimes % in the process to recover the solids. You probably recover above 75% of solids in the process. Thereafter your plant will perform very good and yield recover.

David Kano
10 months ago
David Kano 10 months ago

I prefer using Filter press in PLS making processin this way I sure that there not any suspended solid in the solution. I think that using flocculent increase crud formation.

Helena Russell
10 months ago
Helena Russell 10 months ago

Non-ionic floc's are fairly commonly used during crud events such as a significant rain event; however, use of a clarifier is quite uncommon (you can't afford it at the low percent solids in the feed). I have used a large PLS ponds as a settling basin. Jaime is also correct in the use of pin-bed clarifiers is gaining use - especially in Africa on the agitated leach plants (see TFM). Non-ionic floc's should not affect the SX process unless you go VERY high in concentration. Simple lab tests (break times) should result in appropriate answers.

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