Froth Flotation (Sulphide & Oxide)

Froth Flotation (Sulphide & Oxide)2017-04-04T06:57:31-04:00
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Controlled Potential Sulphidisation (CPS) - Demand for a lab-scale process flow-sheet (1 reply)

3 years ago
a.eslami 3 years ago


recently, I am working on processing of a gold bearing mixed oxide-sulfide copper ore (Av. Cu; 0.80 & Av. Au; 0.2ppm). 

After some research and testing different methods, I found Controlled Potential Sulphidisation (CPS) Flotation as the most effective & practical method on similar ores (E.g., Kanmantoo, Australia & Kansanshi, Zambia).

I am working in a processing lab, which is fully equipped for sulfide ore flotation tests, but I have not done a real CPS test yet. Until now, sulphidisation have been done there by simple adding specified amount (g/t) of Na2S.

Recently I bought a Silver/Sulfide Ion Selective (combination) Electrode (IONODE), for controlling Es in during sulphidisation (-600mv) and flotation (-450mv) stages. But I still have many question and difficulty in using this electrode and caring out a standard CPS Flotation test.

I need someone to guide me to conduct a standard CPS test.

I also need a detailed standard flow-sheet of CPS lab-scale test, or a sample lab report, if possible. 

Any assistant/advise/answer/file would be greatly appreciated...


3 years ago
David 3 years ago

Hi, my contact at gave me a couple of things for you:

Not all copper “oxides” are equal.  Carbonates Azurite and Malachite respond really well to CPS.  Cuprite, not as well and tennorite and chrysocolla not well at all.  It is almost imperative that you try to identify the minerals you are considering oxide.

The probe does not sound right.  The most common electrode in use is a platinum redox/orp probe with a silver/silver chloride reference electrode.  With that probe, you must add your reducing reagent (Na2S or HaHS) to reach -50 to -120 mv direct reading.  The following link is an example of the type of probe I have described.

If you are using air, you will be oxidizing continuously so you have to always be adding you reducing agent to maintain the potential.  This will result in high reagent consumption.  The use of nitrogen as the flotation gas will reduce reagent consumption and stabilize you potential and is common practise.

Finally, you still have to add collector.

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