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The acknowledged chemical nature of the interaction between dextrin and sulphide mineral surfaces (involving complexation between hydroxyl groups on the polymer and metal ion sites on the mineral, see Liu and Laskowski, 1989, or Raju et al., 1997) could equally result in some form of passivation, reducing the degree of oxidation with time and
Historically, the choice of a polymer to depress a particular gangue mineral in flotation has been based on empirical testing. The trend in recent times has been to specifically design polymers for this purpose as well as for other areas of mineral processing (Chen et al., 2003). The approach followed has been to tailor the molecular weight and
