Froth Floatation Process: Breaking Sulphide Ore using Acid

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In the froth flotation process for concentrating sulfide ore, finely divided CuFeS2 is suspended in water with pine oil, and air is introduced to create a froth that allows the ore to float while the gangue sinks. The discussion raises a question about the role of dilute acid, specifically nitric acid, in breaking down the froth containing sulfide ore. It emphasizes that, based on existing knowledge and referenced sources, the addition of acid is not a standard practice in this process. The focus remains on the effectiveness of the froth flotation method without the involvement of acids, highlighting the importance of understanding the chemical interactions and reactions occurring during the concentration of sulfide ores.
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in froath floatation process of concentrating the sulphide ore how is froath containing sulphide ore broken by adding dilute acid what is the actual reaction
 
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Please refer to this site first: http://home.att.net/~cat6a/metals-IX.htm

I quote now, from http://www.citycollegiate.com/IX_copper.htm

"Finely divided CuFeS2 is concentrated by "Froth-floatation method". Crushed ore is suspended in water containing pine oil. A blast of air is passed through the suspension. The particles of ore get wetted by oil and floats as a froth which is skimmed. The gangue sink to the bottom."

And as far as I can recall, I never encountered an addition of nitric acid (or for that matter any acid) to the froth floatation mixture (containing pine oil and the crushed ore suspended in water).

Please clarify...

Cheers
Vivek
 
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