醋酸镧的制备工艺及表征

Preparation and Characterization of Lanthanum Acetate Crystal

采用冰醋酸溶解氧化镧工艺制备醋酸镧。考察冰醋酸液酸度、氧化镧与冰醋酸的固液比、溶解温度、溶解时间对醋酸镧浸出收率的影响,同时阐述常温下冰醋酸溶液浸出氧化镧的工艺。结果表明,在醋酸浓度为1.5mol·L^-1,氧化镧与冰醋酸的固液比为0.8,溶解温度为65℃,溶解时间为0.5h的最佳条件下制备的醋酸镧产品组成为La(CH3COO)3·H2O,并对其稀土总量,杂质含量,形貌与结构,热分解机制指标进行检测和表征。

The preparation process of lanthanum acetate by dissolving lanthanum oxide in glacial acetic acid was studied.The effects of the concentration of acetic acid,the solid-liquid ratio of lanthanum oxide and glacial acetic acid,the dissolving temperature,the dissolving time on the leaching rate of lanthanum acetate was analyzed,the process of leaching by dissolving lanthanum oxide in glacial acetic at room temperature was discussed.It was found that the optimum conditions to the leaching rate of lanthanum acetate were as follows:the concentration of acetic acid was 1.5 mol·L^-1,the solid-liquid ratio of lanthanum oxide and glacial acetic acid was 0.8,the dissolving time was 0.5 hours,the dissolving temperature was 65℃,and under this condition,the lanthanum acetate crystal La(CH3COO)3·H2O was prepared,and rare earth content,impurity content,morphology and structure,and thermal degradation mechanism of lanthanum acetate crystal were characterized.