金属陶瓷惰性阳极铝电解扩大实验研究

用新研制的铝电解金属陶瓷材料做铝电解阳极,在摩尔分子比为2 8、饱和氧化铝浓度的冰晶石系电解质中进行100A电流电解实验,电解温度为960℃,阳极电流密度为1 0A/cm2·实验结果表明,该金属陶瓷阳极具有优良抗热震性的同时显示出优良的抗氧化耐冰晶石熔盐腐蚀性能,阳极年腐蚀速率为24mm/a,阴极铝的质量达到98%·使用铝参比电极测得在960℃下该阳极的反电动势为2 2V·经奥氏气体分析仪检测表明,释放出的阳极气体中氧气的含量为98%～100%·

Experimental Study on Cermet as Inert Anode for Aluminium Electrolysis

An experiment of a newly developed cermet used as inert anode for aluminium electrolysis was conducted in cryolite-based molten salt as electrolyte with cryolite mole ratio 2.8 and saturated alumina concentration for 7 h at 960°C, in which the direct current was set to 100 A with an anodic current density 1.0 A/cm². The results showed that this cermet anode has high resistance to thermal shock, oxidation and corrosion of the molten salt. e. g., the annual corrosion rate is 24 mm, and the purity of aluminium is up to 98%. The back electromotive force is 2.2 V at 960°C as detected by aluminium reference electrode and the evolved anodic gas contains 98%-100% oxygen as analyzed by apparatus.