Nitrogen & Copper-Nickel Ore
Copper-Nickel Ores are made of Pentlandite (Ni,Fe)9S8, that is nearly always associated with pyrrhotite Fe1-xS, and is often found also to be associated with chalcopyrite, cubanite and other iron and nickel sulphides and arsenides (e.g. niccolite NiAs, gerdsdorffite NiAsS). The main purpose of nitrogen is to prevent excessive oxidation of sulphides and first of all, nickel bearing pyrrhotite [17, 18]. The best action of nitrogen can be obtained when its addition begins in the grinding stage and continue during flotation. Figure 6 shows Nickel recovery kinetics in nitrogen and air flotation, (a) laboratory conditions, (b) full scale pulp flotation.
According to Bogdanov et.al. [17], grinding and flotation in nitrogen medium can provide 3% increase in nickel and copper recovery. This effect is more notorious in higher grade disseminated ores. In Figure 6(b) can be appreciated the negative effect of oxidation during grinding. Thus, it is necessary to provide conditions, preventing excessive oxidation during grinding.
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