Abstract
The relationship between anodic potential and sulfur film of bornite in acidic electrolyte was investigated by electrochemical experiments and surface analytical techniques. The formation of sulfur film decreased the conductivity of bornite, and the initial current density of bornite was positively correlated with subjected potential due to thermodynamic energy. The higher potential hindered the formation of sulfur precipitates Sn 2-/S0 and forced products of bornite diffuse into electrolyte. The S 2p 3/2 spectrum proved that S2- has been converted to S2 2-, Sn 2-/S0 and SO4 2- during bornite dissolution. Combined with the composition of sulfur film formed on the bornite surface, the passive effect of sulfur film was mainly caused by formed Sn 2-/S0. The solution potential was the primary factor in the bornite dissolution under acidic environment.
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