氯化钇阳离子膜电解制备Y(OH)_(3)并热处理合成Y_(2)O_(3)

Yttrium Hydroxide was Prepared by Electrolysis of Y(OH)_(3) Cation Membrane and Heat Treated to Generate Y_(2)O_(3)

通过电化学方法制备稀土氧化物在环保和经济上极具优势,阳离子交换膜电解氯化稀土转化技术还未应用于Y_(2)O_(3)的制备过程,对于YCl_(3)转化过程的参数和优化方法仍不清楚。本研究以氯化钇水溶液为原料通过阳离子交换膜电解技术,在阴极得到了片层状Y(OH)_(3)沉积物。用DSC-TG,FTIR和XRD研究了Y(OH)_(3)的热分解过程,得到了继承前驱体结构的Y_(2)O_(3)产物。使用SEM和XRD测试了不同极距、阴极钇离子浓度、电流密度、温度对电解产物的晶体和形貌的影响。得到最佳实验条件为:5 cm极距、0.025 mol·L^(-1)阴极钇离子浓度、31.3 mA·cm^(-2)电流密度和55℃电解温度下,产物具有最好的形貌和粒子结构。

The preparation of rare earth oxides by electrochemical method has great advantages in environmental protection and economy,and the cation exchange membrane electrolytic rare earth chloride conversion technolo‐gy has not been applied to the preparation process of Y_(2)O_(3),and the parameters and optimization methods of the Y(OH)_(3) conversion process are still unclear.In this study,Y(OH)_(3) aqueous solution was used as raw material,and flake yttrium hydroxide deposits were obtained at the cathode by cation exchange membrane electrolysis technology.The thermal decomposition process of yttrium hydroxide was studied by DSC-TG,FTIR and XRD,and yttria products inherited from the precursor structure were obtained.SEM and XRD were used to test the ef‐fects of different pole pitches,cathode yttrium ion concentration,current density,and temperature on the crys‐tals and morphology of the electrolyte.The best experimental conditions are as follows:5 cm pole distance,0.025mol·L^(-1)cathode yttrium ion concentration,31.3 m A·cm^(-2)current density and 55℃electrolysis temperature,the product has the best morphology and particle structure.