Removing xanthate collector from gold surface - Froth Flotation (Sulphide & Oxide) - Metallurgist & Mineral Processing Engineer

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Removing xanthate collector from gold surface (5 replies and 4 comments)

7 years ago

Hello,

I'm conducting a study on gold flotation where I will use xanthate as a collector reagent. In this regard, I encountered a problem that is the xanthate is covering mineral surface with help of chemical adsorption. After that cyanide solution could not be able to reach gold surface for leaching process. And gold recovery decreased as a result.

How can I desorp to xanhtate from gold surface in order to increase recovery rate?

Thank you for your interest.

Mike Rockandel

7 years ago

Mike Rockandel 7 years ago

I have no idea if it is equivalent but in molybdenum flotation process, collector is released from pyrite and chalcopyrite, prior to collecting with fuel oil, by operating at high pH ~11 with a very negative ORP generated with NaHS. Alternately, Nalco has a reagent 7260 that is apparently able to react remove and tie up collector, avoiding or minimizing NaHS usage. Just an idea 🙂

http://www.rockandel.com/

omer.canieren

7 years ago

You are talking about depressing of sulphide minerals? I don't need it. After a chemical adsoption how can I remove reagent from mineral surface? This is some difficult cleaning due to chemical adsoption. I desired a recommendation with this aspect.

Mutassim

7 years ago

Mutassim 7 years ago

You can try to adsorb xanthate with activated carbon a head of cyanidation

omer.canieren

7 years ago

My process already contains adsorption with activated carbon. Because of xanthate is attaching on mineral surface thanks to chemical adsoption you can not easily remove it from mineral surface.

Pabloski

7 years ago

Pabloski 7 years ago

I would take a look into bencines, gasolines, or a type of oil to avoid xanthate to adhere to mineral surface.. but this is just a hunch of course.

Good luck

David

7 years ago

David 7 years ago

more on this topic:

https://www.911metallurgist.com/hydrometallurgy/effect-of-flotation-reagents-on-carbon-during-leac/

https://www.911metallurgist.com/hydrometallurgy/effect-of-flotation-reagents-on-activated-carbon-during-gold-adsorption/

https://www.911metallurgist.com/froth_flotation/strippingflotation-collector/

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omer.canieren

7 years ago

Thank you dear friend.

huahua

2 years ago

huahua 2 years ago

People often use the method of acid decomposition, that is, taking advantage of the easy decomposition of xanthate, on the basis of the natural decomposition of xanthate, by adding a strong acid medium (hydrochloric acid or sulfuric acid) to promote the decomposition of xanthate. The decomposition of xanthate increases with the acidity, and the decomposition rate is accelerated. By stirring, all decomposition can be achieved in a short time. Found through experiments that 3 mL of hydrochloric acid was added to 250 mL of butyl xanthate solution with a concentration of 10 mg/L, and stirred at a speed of 300 r/min. After 2 h, the xanthate could be decomposed to 93%. With 5 mL of hydrochloric acid, 100% decomposition can be achieved.

jliakos

2 years ago

Do the same kinetics apply to the dixanthogen which I believe is the product of xanthate adsorption on a mineral surface?

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