Production of Cu-Mg Alloy from MgO by Molten Salt Electrolysis AITranslate

Basic Information:

DOI：

Chinese Library Classification Number:TG132.32[一般工业技术—材料科学与工程]

Citation Information:

During the preparation of magnesium metal and its alloys by traditional molten salt electrolysis,the use of anhydrous MgCl₂ as the electrolytic raw material faces the problems of high dehydration cost and the generation of corrosive chlorine gas,while the direct use of MgO as the electrolytic raw material has been pursued in the field of magnesium metallurgy.Therefore,the system of Cu cathode|MgF₂-LiF-MgO molten salt|graphite anode was established to realize the direct preparation of Cu-Mg alloys by molten salt electrolysis,and the electrochemical behaviors of the ions in the molten salt system and the settling beha-vior of MgO in the molten salt were systematically investigated.The results show that during preparing Cu-Mg alloy by the molten salt electrolysis method,the cell voltage should be controlled within 1.5~4.5 V.Underpotential deposition of Mg²⁺occurs on the Cu cathode and O^2-is preferentially oxidized over F^-on the graphite electrode.The low solubility of MgO causes the molten salt after electrolysis to exhibit a stratified distribution state,namely,the bottom MgO settling layer,the middle MgO suspension diffusion layer,and the upper MgO-depleted layer.The depletion of MgO is likely to lead to the attenuation of the current intensity or the occurrence of an anode effect.Using Cu as the cathode,a Cu-Mg alloy with a Mg mass fraction of 19.98%is obtained after constant voltage electrolysis at 2.5 V for 11 A·h,and the current efficiency is 96.67%.The alloy product is mainly composed of Cu₂Mg phase and contains a small amount of CuMg₂ phase.