喷雾干燥制备纳米氧化钇研究

Study on the Preparation of Nanometer Yttrium Oxide Via Spray Drying Process

摘要:

液相沉淀法制备纳米粉体过程中，喷雾干燥参数的选择直接影响粉末产物的形貌和粒径。针对碳酸钠和碳酸氢钠混合沉淀剂沉淀获得的前驱物，采用先进喷雾干燥工艺对其脱水造粒，旨在解决粉末团聚等问题。结果表明：在干燥温度150 ℃，蠕动泵速度40%的喷雾干燥条件下，可获得D₅₀=3.30 μm、(D₉₀-D₁₀)/2D₅₀=0.46，粒径分布窄的球形纳米碱式碳酸钇前驱团聚体；通过控制升温速度5.375℃/min，煅烧温度860℃，煅烧时间1h，团聚体可制备得到单一粒径30—60 nm、D₅₀=0.050 μm，分散性良好的立方晶型纳米Y₂O₃。

Abstract:

During the preparation process of nanometer powder via liquid phase precipitation method， the selection of spray drying method directly affects the morphology and particle size of the powder product. In this paper， the advanced spray drying process is used to dehydrate and granulate the precursor obtained by precipitation with a mixed precipitant of sodium carbonate and sodium bicarbonate， aiming to solve the problem of powder agglomeration. The results show that under the spray drying conditions with a drying temperature of 150 ℃ and a peristaltic pump speed of 40%， the spherical nano-basic yttrium carbonate precursor aggregates with a narrow particle size distribution of D₅₀=3.30 μm， （D₉₀-D₁₀）/2D₅₀=0.46 can be obtained. By controlling the heating rate of 5.375 ℃?min^-1， the calcination temperature of 860 ℃， and the calcination time of 1h， the aggregates can be prepared into well-dispersed cubic crystal nanometer Y₂O₃ with a single particle size of 30—60 nm and D₅₀=0.050 μm.