微反应器技术制备纳米磷酸铁的研究与表征

Preparation and characterization of nano-sized ferric phosphate with microreactor

采用微反应器技术对以硫酸铁和磷酸钠为原料制备纳米磷酸铁进行了研究,考察了反应物浓度、反应物流量、反应温度对产品形貌及粒径的影响,利用激光粒度分析仪和扫描电镜对产品进行了表征。结果表明,反应温度对磷酸铁粉体的粒径影响很大,且随温度升高产品粒径增大。在常温、硫酸铁溶液浓度为0.10～0.25 mol/L、磷酸钠溶液浓度为0.20～0.50 mol/L、硫酸铁与磷酸钠溶液流量比为4∶5、反应物料在微反应器反应通道内的流速超过5 m/s条件下,可制得纳米级磷酸铁粉体。由微反应器制得的磷酸铁纳米粉体呈不规则形状,粒度分布较窄。

Nano-sized ferric phosphate was prepared by using ferric sulfate and sodium phosphate as raw materials in a microreactor system.Influence of operation conditions including concentration,flow rate,and reaction temperature on the morphology and particle size of ferric phosphate powder was investigated.Obtained products were characterized by laser diffraction particle size distribution instrument and SEM.Results showed that reaction temperature had a great influence on the average size of ferric phosphate powder and the particle size will increase with the rising of temperature.Nano-sized ferric phosphate powder could be produced under room temperature,concentration of ferric sulfate at 0.10～0.25 mol/L,concentration of sodium phosphate at 0.20～0.50 mol/L,flow rate ratio of ferric sulfate to sodium phosphate solution at 4∶5,and the flow velocity of reactants in the react channel greater than 5.0 m/s.Ferric phosphate powder produced with microreactor was in irregular shape and its size distribution was narrow.