电化学脱氧提纯稀土金属钇(Y)的物理化学问题

Physical Chemistry Questions on the Purification of Rare Earth Yttrium by Electrochemical Deoxidation

在电化学脱氧提纯金属钇的过程中,利用熔融的CaCl2使其副产品CaO的活度降低,脱去的氧以CO或CO2气体的形式从石墨阳极放出,只要电解条件合适,可使脱氧极限无限降低,同时金属钙是由CaCl2电解所得,较Ca-CaCl2熔盐脱氧提纯金属钇的方法,它降低了由于金属Ca的不纯而引入的杂质污染。对于形状规则的金属钇脱氧时间为t=(d2/π2D)ln[(4c0/πc)sinπx/d]。脱氧后的产品有少量的碳污染,但对实验进行一定的改进后,也可得到氧含量和碳含量都低于100μg/g的金属钇。

Molten CaCl2 was used to decrease the activity of the by-product CaO during the purification of rare earth yttrium by electrochemical deoxidation, in which the oxygen was removed as CO or CO2 gases from the graphite anode. The metal calcium was obtained by CaCl2 electrolysis. Only if the electrolysis condition is fit, the Method can make deoxidation infinitely fully and decrease the pollution caused by the impurity of the metals calcium as compared with the method removing the oxygen in yttrium by Ca-CaCl2 fused-salt. The deoxidation time t for the yttrium metal in regular shape is （d^2/π^2D）ln[（4c0/πc）sinπx/d]. The product taken off oxygen contains a little carbon contamination, but the contents of oxygen and carbon in product would be less than 100 μg/g after improvement by the experiments.