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Anodic sulfidation of FeS electrode in a NaCl saturated AlCl3-NaCl melt

1988; Elsevier BV; Volume: 33; Issue: 8 Linguagem: Inglês

10.1016/0013-4686(88)80205-6

1873-3859

Norio Takami, Nobuyuki KOURA,

Metal Extraction and Bioleaching

Cyclic voltammogram of a FeS electrode in an AlCl3NaCl melt saturated with NaCl containing dissolved Al2S3 was found to be similar to that of the positive electrode of an Al/FeS2 secondary cell. Anodic sulfidation of the FeS in the melt was characterized as the oxidation reaction which produces FeS2 under diffusion control of a sulfide ion as AlSClt-2 by using cyclic voltammetry, ac impedance measurements, and X-ray analysis. Moreover, from the detailed analysis of the results, the mechanism for the anodic reaction was proposed to be FeS + AlSClt-2 + 2Clt-⇌FeS2 + 2et-. The diffusion coefficient of the AlSClt-2 was calculated to be 1 x 10t-6 cm2 st-1 at 240°C.