Investigations on Reaction Pathway and Microstructure Transformations during Electrochemical Reduction of Cr2O3 in Molten CaCl2. Issue 9 (9th July 2016)

• Record Type: Journal Article
• Authors: Liu, Zheng-wei; Zhang, Hong-ling; Pei, Li-li; Zhu, Guang-jin; Xu, Hong-bin; Zhang, Yi
• Is Part Of: Journal of the Electrochemical Society. Volume 163:Issue 9(2016)
• Page Start: H781
• Page End: H786
• Publication Date: 2016-07-09
• Subjects: CaCr2O4 -- Cr metal -- FFC -- molten salt; Electrochemistry -- Periodicals; 541.3705
• DOI: 10.1149/2.0621609jes
• Languages: English
• ISSNs: 0013-4651

Abstract

Abstract : The reaction pathway and microstructure transformations in the electrochemical reduction of chromium oxide (Cr2 O3 ) to chromium (Cr) metal in CaCl2 molten salt were investigated. Some partially electrolyzed products and Cr metal were prepared by terminating the reduction process after different time periods, which were further characterized by means of XRD and SEM et al. Calcium chromite (CaCr2 O4 ) was chemically in-situ synthesized in CaCl2 molten salt using Cr2 O3 and CaO as raw materials, and its cyclic voltammogram test and electrolysis process were examined. The reaction pathway in the electrochemical reduction of Cr2 O3 was hence demonstrated to proceed through a number of well-defined reaction steps, one of which involved the chemical formation and decomposition of CaCr2 O4 . Meanwhile, the microstructures changed dramatically with the process progresses. An observation-based assumption was proposed to account for the different morphologies of cubic and nodular Cr particles formed at the early and later stages, respectively.