雾化干燥法制备球形超细氧化镍粉工艺研究

Study on the technology of preparing ultrafine spherical NiO by spray drying

采用雾化干燥法制备超细球形氧化镍粉,重点研究雾化干燥过程中料液镍离子浓度、游离氨浓度对前驱体形貌、显微结构的影响;前驱体煅烧温度对氧化镍粉形貌、结晶性能的影响。结果表明:提高溶液镍离子浓度、降低游离氨浓度有利于制备球形均匀、球壳光滑致密的前驱体粉末;前驱体在800℃煅烧1h,可得到晶型优良的球形超细氧化镍粉。

Uhrafine spherical NiO was prepared by spray drying. The influence of nickel ion concentration and free ammonia concentration of solution on precursor morphology and mierostructure in spray drying process, and the influence of roasting temperature on the morphology and crystallization property were studied. The results show that it is benefieial to prepare homogeneous spherical and smooth shell precursor while increasing the solution nickel ion concentration and decreasing the free ammonia concentration, spherical uhrafine nickel oxide powder with fine crystal form ean be prepared under the conditions of roasting temperature 800℃, roasting time 1 h.