内热式回转炉处理电解MnO_2技术的研究

Study on treating electrolytic manganese dioxide with inner-heated revolving stove

为克服高温烘箱法处理电解MnO2(EMD)时锰粉受热不均、加热时间过长等缺点,采用内热式回转炉处理EMD。X射线衍射(XRD)分析结果表明,经回转炉和烘箱热处理后,EMD的主要成分均从!-MnO2转变为"-MnO2,晶格常数和晶胞体积发生了相应变化,晶粒尺寸显著增大,结晶度得到提高。两种方法得到的#$-MnO2结晶相组成和结晶度非常接近,但在相同温度下热处理EMD时,回转炉法比烘箱法用时短,能耗低,粉体受热均匀、充分,处理效果好。

Inner-heated revolving stove was used to treat electrolytic manganese dioxide （EMD） to overcome the shortcomings of high temperature oven, which took too long time and could not heat the powder uniformly. Results of X-ray diffractions showed that the main component of EMD had changed from γ-MnO2 to β-MnO2 after being treated by those two means.Crystal lattice constants and unit lattice cubage changed accordingly. Moreover, crystal sizes increased markedly and crystallizing degree was enhanced. Treating EMD with revolving stove needed less time and energy than with oven at the same temperature but the powder was heated up equably and enough. Also, γβ- MnO2 of almost the same crystal phase components and crystallizing degree was obtained.