摘要
研制了一种新型铝电解金属陶瓷惰性阳极,阳极基体由Fe Ni Co Al O构成。在电解温度960℃,氧化铝质量浓度为6.0%,阳极电流密度为1.0A/cm2,分子比为2.6的电解质中对其进行了10h的电解。电解过程平稳,电解铝产品纯度达到96%~99%,阳极气体中氧气的含量为98%,反电动势为2.45V,高于理论值0.25~0.35V。此阳极具备较好的导电性、抗氧化和耐腐蚀性。采用X射线衍射和电子探针微分析仪(EPMA)对电解后的阳极进行分析,发现阳极表面存在铁酸镍、铝酸铁等尖晶石型化合物,阳极表面下层为铝酸铁、钴酸镍等陶瓷相以及金属相;金属相和陶瓷相相互弥散分布构成结构致密的金属陶瓷层。
A new inert anode consisited of Fe-Ni-Co-Al-O was made for aluminum electrolysis. Electrolysis with this anode was conducted at 960 ℃ for 10 h in a cryolite-alunima electrolyte with CR2.6 and Al_2O_3 content 6%, the anode current density is 1.0 A/cm^2(100A). The purity of aluminum metal attained is in the interval of 96%~99%, and the anode gases analysed by an Orsat apparatus is 98%~99%. The back EMF value of the cell is 2.45 V at 960 ℃, which is about 0.250.35 V higher than the theoretical decomposition voltage of the above electrochemical reaction. X-ray diffraction and electron probe micro-analyzer results on the anode after electrolysis show that there are NiFe_2O_4, FeAl_2O_4 at the surface of this anode, and there are FeAl_2O_4, NiCo_2O_4 and Ni, Fe metals under the surface of this anode, metal phases and ceramic phases are well dispersed forming compact metal ceramic structure.
出处
《中国有色金属学报》
EI
CAS
CSCD
北大核心
2004年第F01期36-40,共5页
The Chinese Journal of Nonferrous Metals
基金
国家重点基础研究发展规划资助项目(G1999064903)
国家"八六三"计划资助项目(2001AA335010)