高碳铬铁熔盐电解精炼制备低碳纯净铬铁

以NaCl?KCl熔盐为电解质、高碳铬铁为工作电极、钨丝为对极、Ag/AgCl为参比电极，在阳极电极电势为0.3 V (vs. Ag/AgCl)的恒压条件下一步熔盐电解高碳铬铁制备低碳纯净铬铁；通过方波伏安法研究了阴极铬铁沉积机理，对阴极电解产物进行了微观分析和物相表征. 结果表明，阴极铬离子沉积是由扩散控速的一次性得失2个电子的可逆反应，且阳极中金属铬先于铁氧化进入熔盐；低碳铬铁合金为粒径0.5?2 ?m的球状颗粒，阴极产物低碳铬铁的碳含量仅为0.24wt%.

Preparation of Low Carbon Pure Ferrochromium from High Carbon Ferrochromium by Molten Salts Electrorefining

Low carbon ferrochromium was prepared from high carbon ferrochromium in NaCl?KCl molten salts by one-step potentiostatic electrolytic refining (0.3 V, vs. Ag/AgCl), with high carbon ferrochromium acted as working electrode, tungsten acted as counter electrode and Ag/AgCl as reference electrode. The mechanism of electrodeposition of dissolved Cr ions was investigated by square wave voltammetry. Microscopic and phase characterization of cathodic products were analyzed. The results showed that the reduction of chromium ions is a one-step reversible process with two electrons exchanged, which is controlled by diffusion mass transfer, and chromium was dissolved prior to iron in molten salts. The produced low carbon ferrochromium is mostly composed of spherical particles with the size ranging from 0.5 to 2 ?m. The carbon content of the cathode product was 0.24wt%.