Anodic dissolution of arsenopyrite in ammoniacal solution has been investigated by electrochemical methods. The process is an irreversible reaction with formation of a ferric oxidized film and is retarded by the film....Anodic dissolution of arsenopyrite in ammoniacal solution has been investigated by electrochemical methods. The process is an irreversible reaction with formation of a ferric oxidized film and is retarded by the film. The process rate is controlled by the electrochemical reaction on the electrode surface in the lower temperature range, or alternatively by the diffusion through the film in the higher temperature range. The overall reaction has 14 electron transferred and can be expressed by FeAsS + 11H2O = Fe(OH)3 + SO42- + HAsO42- + 18H+ + 14e-, and the reaction involves two steps: (1) FeAsS + 7H2O = Fe(OH)3 + HAsO42- + S0 + 10H+ + 8e- , (2) S0 + 4H2O = SO42- + 8H+ + 6e- .展开更多
基金Supported by the National Natural Science Foundation of China (No.: 59674023)
文摘Anodic dissolution of arsenopyrite in ammoniacal solution has been investigated by electrochemical methods. The process is an irreversible reaction with formation of a ferric oxidized film and is retarded by the film. The process rate is controlled by the electrochemical reaction on the electrode surface in the lower temperature range, or alternatively by the diffusion through the film in the higher temperature range. The overall reaction has 14 electron transferred and can be expressed by FeAsS + 11H2O = Fe(OH)3 + SO42- + HAsO42- + 18H+ + 14e-, and the reaction involves two steps: (1) FeAsS + 7H2O = Fe(OH)3 + HAsO42- + S0 + 10H+ + 8e- , (2) S0 + 4H2O = SO42- + 8H+ + 6e- .
