Citation: HAN Ping, FENG Haitao, LI Ling, DONG Yaping, TIAN Sen, ZHANG Bo, LI Bo, LI Wu. Electrochemical Oxidation of High Carbon Ferrochrome in Sodium Hydroxide Aqueous Solution[J]. Chinese Journal of Applied Chemistry, ;2020, 37(6): 709-718. doi: 10.11944/j.issn.1000-0518.2020.06.190333 shu

Electrochemical Oxidation of High Carbon Ferrochrome in Sodium Hydroxide Aqueous Solution

HAN Ping ^1,2,3 ,
FENG Haitao ^1,2,, ,
LI Ling ^1,2,3 ,
DONG Yaping ^1,2 ,
TIAN Sen ^1,2,3 ,
ZHANG Bo ^1,2 ,
LI Bo ^1,2 ,
LI Wu ¹

a.
Key Laboratory of Comprehensive and Highly Efficient Utilization of Salt Lake Resources, Qinghai Institute of Salt Lakes, Chinese Academy of Sciences, Xining 810008, China
b.
Qinghai Engineering and Technology Research Center of Salt Lake Resources Development, Xining 810008, China
c.
University of Chinese Academy of Sciences, Beijing 100049, China

Corresponding author: FENG Haitao, fenght@isl.ac.cn
Received Date: 13 December 2019
Revised Date: 26 February 2020
Accepted Date: 26 March 2020

Fund Project: the Basic Research Project in Qinghai Province 2017-ZJ-786the Major Science and Technology Project in Qinghai Province 2016-GX-A10Supported by the Basic Research Project in Qinghai Province(No.2017-ZJ-786), and the Major Science and Technology Project in Qinghai Province(No.2016-GX-A10)

Figures(8)

Although ferrochrome electrolysis technology is a novel method for preparing sodium chromate, the electrochemical oxidation of high carbon ferrochrome in NaOH aqueous solution is still unclear. The electrochemical oxidation of chromium in NaOH aqueous solution was studied by cyclic voltammetry(CV). The electrochemical oxidation of high carbon ferrochrome in NaOH aqueous solution was studied by cyclic voltammetry and linear sweep voltammetry (LSV). Scanning electron microscope (SEM), energy dispersive spectrometry (EDS) and X-ray photoelectron spectroscopy (XPS) were used to characterize the composition of solid phase products after electrolysis of high carbon ferrochrome electrode. The results are as follows:metal chromium has two ways of electrochemical oxidation to form sodium chromate in NaOH aqueous solution: Cr(0)→Cr(Ⅵ) and Cr(0)→Cr(Ⅲ)→Cr(Ⅵ). The electrochemical oxidation of high carbon ferrochrome in NaOH is different from the metal chromium. It directly generates sodium chromite by Cr(0). Cr(OH)₃ occurs electrochemical reaction with Fe(0) to form stable FeCr₂O₄. Fe(OH)₃ is formed by the strong hydrolysis of FeO₂^-. As the concentration of NaOH aqueous solutions increases, the high carbon ferrochrome is easily passivated in NaOH aqueous solution under low potential range due to the influence of Fe(0). The passive films are Fe₃O₄ and Fe₂O₃. The passivation films dissolve at high potential. Then high carbon ferrochrome occurs electrochemical reaction to form Na₂CrO₄, Fe(OH)₃ and FeCr₂O₄. At the same time, a large amount of oxygen is deposited on the positive electrode surface. As the concentration of NaOH aqueous solutions increases, the amount of Na₂CrO₄ and Fe(OH)₃ increases. The conditions are as follows: alkaline concentration ≥2 mol/L, anodic potential ≥1.6 V(vs.SCE).
- high carbon ferrochrome,
- metal chromium,
- NaOH aqueous solution,
- electrochemical oxidation,
- anodic polarization
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