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- W2034599029 abstract "The collectorless flotation of sphalerite due to inadvertant activation is quite limited and the floatability of iron-bearing sphalerites with the aid of collector is due to the formation of diethyldixanthogen which forms a 5-membered ring complex with zinc(II). Hence activation of sphalerite by heavy metal ions, prefarably the softer species, is necessary in a majority of flotation circuits. Copper(II) ‘dopes’ ZnS phase and the surface compound slowly gets converted to covellite with simultaneous formation of sulphur, It has been reported that the formation of sulphur is also observed during activation by other metal ions; but lacks firm experimental support. However the standard redox potential of S2−/S0 indicates that the formation of sulphur is favourable, more so in acidic medium. But the sulphur formed is highly unstable and hence undergoes SN 2 reactions with the reductants. A majority of workers agree that rate of activation take place in two stages and slow stage of activation is due to diffusion of species through the solid though adsorption appears to be confined to monolayer coverage only. The rates and products of activation, formation of sulphur at the mineral surface, redox potentials, zeta potential measurements and effect of temperature are critically reviewed through 1986." @default.
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- W2034599029 title "The Chemistry of Activation of Sphalerite—A Review" @default.
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