碳酸氢铵沉淀法制备大颗粒球形氧化钇的研究

Study on Preparation of Yttrium Oxide with Large Particle Sizes and Spherical Shapes by Precipitation with Ammonium Bicarbonate

采用碳酸氢铵沉淀法制备球形大颗粒氧化钇粉体,粉体用激光粒度仪、SEM和BET分析方法进行表征,研究了反应温度、料液浓度、陈化时间、灼烧温度对氧化钇形貌、粒度、比表面积的影响。最佳的工艺条件为:沉淀反应温度93℃、料液浓度40 g/L、陈化时间28 h、灼烧温度1400℃,在此条件下制备出氧化钇,中心粒径D50为61.54μm,形貌为针状晶体组成的球形。

Yttrium oxide powder with large particle sizes and spherical shapes were prepared by precipitation with ammonium bicarbonate. The powders were characterizated by laser partical size analyzer,SEM and BET. Influence of reaction temperature,concentration of feed liquid,aging time and calcination temperature on morphology,particle size and specific surface area of yttrium oxide was studied. The optimum process conditions were that the reaction temperature of precipitation was 93℃,concentration of feed liquid was 40 g /L,aging time was 28 h,and calcination temperature was 1400℃. Yttrium oxide with medium diameter of 61. 54μm and acicular spherical morphology was obtained under the conditions.