摘要
应用化学反应工程的原理,分析了Fe<sub>3</sub>O<sub>4</sub>氧化过程颗粒的热状态,表明存在着火现象,并经实验证实。研究揭示出,为保证Fe<sub>3</sub>O<sub>4</sub>氧化充分,必需使其处于着火状态,但工艺条件的选择还应确保颗粒表面温度低于发生明显烧结和相变温度。确定了氧化反应器适宜的操作区域。
Thermal state of ultrafine Fe_3O_4 particle in the oxidization process was analysed via chemical engineering principle. The result showed that there exists ignition phenomenon and was verified by experiments. This state was neccessary for Fe_3O_4 particle to be oxidized completely, but the condition must be selected with discretion to avoid sintering of γ-Fe_3O_4 and phase transformation to α-Fe_2O_3. Optimized operation area was determined for Fe_3O_4 oxidization reactor.
基金
国家自然科学基金
关键词
磁记录材料
铁黑
氧化
反应器
相变
magnetic recording materials
iron oxide black
oxidization
reactor
ignition
phase tranformation
