Open AccessThe effect of anodic potential on bornite dissolution: A key button of copper pollution
Author(s) -
Hao Lin,
Jun Wang,
Guanzhou Qiu
Publication year - 2021
Publication title -
iop conference series. earth and environmental science
Language(s) - English
Resource type - Journals
eISSN - 1755-1307
pISSN - 1755-1315
DOI - 10.1088/1755-1315/621/1/012110
Subject(s) - bornite , dissolution , electrolyte , sulfur , copper , electrochemistry , conductivity , chemistry , anode , inorganic chemistry , metallurgy , materials science , chalcopyrite , electrode
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 S n 2- /S 0 and forced products of bornite diffuse into electrolyte. The S 2p 3/2 spectrum proved that S 2- has been converted to S 2 2- , S n 2- /S 0 and SO 4 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 S n 2- /S 0 . The solution potential was the primary factor in the bornite dissolution under acidic environment.