Abstract The main raw material for soft ferrite is the electronic grade Mn3O4。 With the expansion of the world wide soft ferrite market, its demand has been steadily increasing。 In China, the demand for soft ferrite is growing faster。 In the next few years, the demand for Mn3O4 will be further increased。
This paper studies the manganese nitrate as raw materials, production preparation process Mn3O4 under vacuum conditions。 Using TG-DSC analysis of manganese nitrate thermal decomposition behavior, X-ray diffraction (XRD), scanning electron microscopy (SEM) of the product of grain morphology analysis。 Different process conditions (temperature, baking time, the degree of vacuum) on the resulting product, find the optimal process conditions。 The results show that: the calcination temperature, and calcination time will have an impact on the degree of vacuum generation product。 Under vacuum roasting time can be shortened preparation, while reducing the thermal decomposition of manganese nitrate to obtain a reaction temperature of Mn3O4。 As in this experiment, manganese nitrate conversion to Mn3O4 at atmospheric pressure above 800 ℃, in the 5 kPa when the sample at 700 ℃ to start the conversion to Mn3O4。 The degree of vacuum, the lower course of the preparation of the required firing temperature, the shorter the roasting time。
Keywords: manganese nitrate; manganese tetroxide; vacuum pyrolysis