Hydrometallurgy: Leaching in Heap, Vat, CIL, CIP, Merrill–Crowe, SX Solvent Extraction

Hydrometallurgy: Leaching in Heap, Vat, CIL, CIP, Merrill–Crowe, SX Solvent Extraction 2017-04-04T06:57:36+00:00
  • To participate in the 911Metallurgist Forums, be sure to JOINLOGIN
  • Use Add New Topic to ask a New Question/Discussion about Hydrometallurgy.
  • 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.

SX Phase separation tests (3 replies)

John Koenig
2 years ago
John Koenig 2 years ago

I was doing some phase separation tests in the lab today and we saw that separation is faster when adding organic to the aqueous at a slower rate (while stirring the aqueous). Any way i can relate this back to the plant? Our A: O ration is 1.2:1, but both feed into the mixer impeller so the essentially feed at the same rate.

Ace Levy
2 years ago
Ace Levy 2 years ago

Yes, we have seen and can reproduce the same phenomena in our lab. The cause is in homogeneity of concentration of the dispersed phase in the vessel, which contributes to a wide distribution of droplet sizes and can even provoke local inversion of the emulsion.

The wide droplet size distribution increases disengagement time by 2-5 times.The emulsion inversion creates a double emulsion, which separates an order of magnitude slower (typically 30 min instead of 2 min), and the separated liquids are usually turbid.
Turbulent Technologies designs mixing systems for SX with special emphasis on completeness of separation whilst maintaining good mass transfer. One important parameter of our systems is the homogeneity of the energy dissipation in the whole tank volume.

John Koenig
2 years ago
John Koenig 2 years ago

When i added organic slowly to aqueous it separated nicely, but adding aqueous to organic had the opposite effect. I suppose this indicates that aqueous continuous is the best operating setup?

Ace Levy
2 years ago
Ace Levy 2 years ago

The choice of continuity is complicate question, where many factors have to be considered - mass transfer, separation rate, which phase should be cleaner after separation etc.

Regarding organic in aqueous: it happens, when a system is more stable with one continuous phase than with another. There is a model which extensively used in the cosmetics industry - "hydrophilic-lipophilic balance" (HLB) that explains this. According to this, the more stable continuity may change with additives.


Please join and login to participate and leave a comment.

BUY Laboratory & Small Plant Process Equipment

We have all the laboratory and plant equipment you need to test or build/operate your plant.

ENTER our Mining Equipment' Store

We Sell EQUIPMENT for all types of Mineral Treatment PROCESSES and Laboratory Testing needs

Have a Mineral Processing QUESTION?

Come in, ask your question

911Metallurgist Community Forums

Talk to other metallurgists and be helped.

Need ENGINEERING Services or Plant TROUBLESHOOTING?

We can IMPROVE ALL PLANTS / Mineral Processing Engineering & LABORATORY Ore Testing

911Metallurgy Engineering

Contact us for process engineering, metallurgical investigations, plant optimization, plant troubleshooting, needs. WE “FIX” METALLURGY.