草酸沉淀法制备大颗粒氧化钇工艺研究

Preparation of Large Particle Yttrium Oxide by Precipitation with Oxalic Acid

采用草酸沉淀法研究制备了大颗粒氧化钇,并对各制备条件对氧化钇粒度影响进行了分析讨论。同时,结合不同煅烧温度下产物的XRD谱图,对煅烧产物进行物相分析,探讨煅烧过程中产物的晶型转变,并利用SEM观察产物形貌。结果表明:提高酸度、沉淀反应温度、延长陈化时间以及降低加料速度均可以有效增大氧化钇粒度;XRD曲线表明沉淀反应制得前躯体的主要成分为Y2(C2O4)3.10H2O,且当前躯体于400,600,800,1000℃煅烧时,所得产物分别为Y2(C2O4)3.2H2O,YOOH,Y2O3,Y2O3;前躯体形貌与最终的氧化物产品形貌存在一定的相似性,均是由小颗粒形成的团聚体,但颗粒粒度存在较大差异。因此,由实验得出了草酸沉淀法制备大粒度氧化钇的工艺条件,且按此工艺条件制备出粒度大于50μm的氧化钇产品,颗粒分散均匀。此外,本工艺操作简单,产品质量稳定,易于推广,可实现产业化。

The large particle yttrium oxide was prepared using oxalic acid as precipitation agent.The effects of preparation conditions on the particle size of yttrium oxide were discussed.Meanwhile,the component and crystalline transition of the calcination product at various calcination temperatures were analyzed by XRD,and the SEM image was also observed.The results showed that the particle size of yttrium oxide could be increased effectively by improving acidity,precipitation temperature,prolonging aging time,and ...