Interactions of molten salts with cathode products in the FFC Cambridge Process  

作　　者：George Z.Chen 

机构地区：[1]Department of Chemical and Environmental Engineering,Faculty of Engineering,University of Nottingham,Nottingham NG72RD,UK [2]Department of Chemical and Environmental Engineering,Faculty of Science and Engineering,University of Nottingham Ningbo China,Ningbo 315100,China

出　　处：《International Journal of Minerals,Metallurgy and Materials》2020年第12期1572-1587,共16页矿物冶金与材料学报（英文版）

摘　　要：Molten salts play multiple important roles in the electrolysis of solid metal compounds,particularly oxides and sulfides,for the extraction of metals or alloys.Some of these roles are positive in assisting the extraction of metals,such as dissolving the oxide or sulfide anions,and transporting them to the anode for discharging,and offering the high temperature to lower the kinetic barrier to break the metal-oxygen or metal-sulfur bond.However,molten salts also have unfavorable effects,including electronic conductivity and significant capability of dissolving oxygen and carbon dioxide gases.In addition,although molten salts are relatively simple in terms of composition,physical properties,and decomposition reactions at inert electrodes,in comparison with aqueous electrolytes,the high temperatures of molten salts may promote unwanted electrode-electrolyte interactions.This article reviews briefly and selectively the research and development of the F ray-F arthing-Chen(FFC)Cambridge Process in the past two decades,focusing on observations,understanding,and solutions of various interactions between molten salts and cathodes at different reduction states,including perovskitization,non-wetting of molten salts on pure metals,carbon contamination of products,formation of oxychlorides and calcium intermetallic compounds,and oxygen transfer from the air to the cathode product mediated by oxide anions in the molten salt.

关 键 词：FFC Cambridge Process molten salts ELECTROLYSIS extraction OXIDES sulfides METALS alloys reaction mechanisms 

分 类 号：TF111.522[冶金工程—冶金物理化学]