I think NaHCO3 will give higher pH.

Hello Risa,

NaHCO3 will give you the higher pH. The main advantage of it over CaCO3 is, Raising the pH causes the polar end to ionize more and to preferentially stick to chalcopyrite (CuFeS2) and leave the pyrite (FeS2) alone. Air is blown into the tanks and agitated like a giant blender, producing a foamy froth. The chalcopyrite grains become coated with xanthate molecules with their hydrophobic ends waving around trying desperately to get out of the water.

I hope this will be helpful for you

Goog luck

thank you so much Pavan. That gives a lot of help.