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While I was studying flotation using seawater, I had a problem with understanding the reason why Aeration and Sodium Metabisulfite is used as a Pyrite depressant in Cu-Mo flotation in seawater.
An article said that sufficient Cu-Mo recovery is attained at the expense of allowing large amount of pyrite in flotation froth and AMBS could be a treatment agent because of not requiring lime to depress Pyrite. (Note: Recovery reduction of Molybdenum was suggested to occur in seawater with high PH level.)
However, considering the PH level must be modified before the flotation start, how could the pyrite is cleaned by using AMBS? If the PH is not modified for Chalcopyrite, the dosage of collectors for Cu is dramatically increased, isn't it? Too Complex!