溶析结晶法制备高纯度亚微米硫酸钡粒子  

Preparation of Barium Sulfate Submicro-particles with High Purity by Solventing-out Process

作　　者：王晓辉[1] 蒋斌波[1] 陈纪忠[1] 

机构地区：[1]浙江大学化学工程与生物工程学系,杭州310027

出　　处：《无机材料学报》2005年第4期801-807,共7页Journal of Inorganic Materials

摘　　要：采用溶析结晶法制备亚微米硫酸钡粒子,并运用TEM、SEM、XRD、激光粒度分析仪等分析方法对粒子的粒径、粒度分布、形貌和晶相进行了表征.结果表明溶析结晶法制备的粒子平均粒径160-750nm、粒度分布均匀、纯度高、晶相完整.考察了结晶温度、加料方式、搅拌速率和料液浓度等过程参数以及分散剂对硫酸钡粒子的影响,发现较低的结晶温度, 反向加料方式、较快的搅拌速率、一定的料液浓度等因素有利于制备亚微米硫酸钡粒子.A novel micronization technique using solventing-out crystallization was described for the preparation of submicron BaSO4 particles. The submicron BaSO4 particles were characterized by transmission electron microscope (TEM), scanning electron microscope (SEM), laser diffraction-based particle size analyzer and X-ray diffraction (XRD). The product was obtained as spherical particles with mean sizes from 160 similar to 750 nm. The effects of feed mode, feed concentration, feed rate, agitation intensity and crystallization temperature in the solventing-out process were investigated. A well-efficiency dispersant was selected. The experimental results indicate that lower crystallization temperature, reversed feed mode, higher feed rate, controlling solution concentration to a certain extent and faster agitation rate will lead to producing smaller BaSO4 particles. Furthermore, the purity of submicron BaSO4 particles prepared by solventing-out crystallization is upon to 99.7%, and it indicates that the solventing-out crystallization is not only a micronization technique but also an excellent purification process.

关 键 词：硫酸钡 溶析结晶 亚微米 晶相 

分 类 号：TF123[冶金工程—粉末冶金]