Cationic Agents
Although all of the metal ions might be considered to be resurfacing agents, only a few are commonly used as such. These are shown in Table 4. Copper, one of the most important, finds use in the flotation of sphalerite (zinc sulfide) which is unaffected by xanthate. Cooper ions are added to the pulp as copper sulfate (Cuso4). The copper adsorbed on the sphalerite surfaces replaces the zinc in the mineral lattice, forming a copper sulfide film on the sphalerite. The sphalerite, therefore, behaves as a copper mineral which can be floated with xanthate.
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The electromotive used to determine the suitability of any metal as a resurfacing agent for any particular mineral. Any metal in the series will displace from solution those metals appearing below it. Copper salts would thus be expected to be suitable for resurfacing nickel, cobalt, iron, and zinc sulfides prior to xanthate flotation and, in fact, are utilized for that purpose.
K, Na, Li Cd Hg (H) |
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