Method for preparing metal oxide cathode in molten salt electrodeoxidation method

Abstract

The invention discloses a method for preparing a metal oxide cathode in a molten salt electrodeoxidation method. The method for preparing the metal oxide cathode is characterized by directly placing a metal oxide raw material into a corundum crucible of a certain shape; directly heating and melting the raw material by using microwave; and then cooling to obtain the needed cathode, wherein the shape of the corundum crucible is the shape of the needed cathode in the molten salt electrodeoxidation method. The method has the advantages of simple process, low cost, convenient operation, low energyconsumption and high efficiency; and at the same time, the cathode prepared by the method is rather compact, molten salt is difficult to erode the inside of the cathode, and an electrolysis product of the cathode has less impurities and high quality.

Description

Technical field [0001] The invention relates to a method for preparing a metal oxide cathode in a molten salt electric deoxidation method. Background technique [0002] The use of molten salt electrolysis to prepare metals or alloys is a kind of metallurgical technology. The conventional method is to melt certain metal salts and use them as electrolytes for electrolysis. During the electrolysis process, the metal ions in the electrolyte are The electrons are obtained at the cathode, which are precipitated as metal atoms and attached to the cathode to obtain a single metal or alloy. [0003] In the molten salt electro-deoxidation method, also known as the FFC method, it also uses the principle of electrolysis to produce metals or alloys, but the process method is different from the above-mentioned conventional method. In 1997, the materials chemistry research group led by DJ Fray of the Department of Materials Science and Metallurgy of the University of Cambridge in the United King...

AI Technical Summary

Problems solved by technology

But these methods all have inherent drawbacks, the first, energy consumption is high, resource consumption is many and preparation time is long etc.; Though adding CaO powder can improve electrochemical reaction activity, accelerate the carrying out of electrolytic reaction, but the CaO increase in final molten salt will Suppresses O in the cathode 2- Dissolution in molten salt is not good for deoxidation

Second, the coefficient of thermal expansion is large

Third, defects such as low electrical conductivity

However, some metal oxides are hard metals, and the impurities are mostly in the form of oxides. No matter whether it is pelletized or pressed, it is impossible to obtain a sample with a certain strength, and a certain forming agent must be added. Or the lubricant is pressed again, but this method adds other impurities into the electrolysis cathode, which has some influence on the quality of the reaction process and reaction results