Abstract
The adsorption of dextrin on chalcopyrite and galena was studied with a concomitant examination of the flotation behaviour of these minerals in the presence of dextrin. It was found that dextrin adsorbs on the sulphide surfaces through interactions with the surface metal hydroxide species. Since lead hydroxide and copper hydroxide appear in different pH ranges, selection of proper pH values, in line with these findings, was shown to lead to the separation of the chalcopyrite/galena mixtures when potassium ethyl xanthate (KEX) and dextrin were used.
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