工业废锰尘氧化动力学

Oxidizing Dynamics of Industrial Waste Manganese Dust

为了使废弃的锰尘资源化 ,拟将废锰尘氧化成MnO2 作为煤粉的助燃剂·考察了Mn2 O3→MnO2 氧化过程的反应机理及其限制性环节 ,得出其反应速度式 ,并有结论 :该氧化反应的氧化率低 ,反应速率小 ,温度及氧分压对其影响较小 ;O2 在Mn2 O3 颗粒表面上的吸附是该反应的限制性环节 ;直接氧化焙烧Mn2 O3 制取MnO2 ,虽然热力学条件可行 ,但其动力学条件难以得到满足·

In order to utilize the waste Mn dust and protect the environment, the Mn dust would be oxidized to MnO 2, which will be used as combustion supporting reagent for pulverized coal injected into blast furnace. The reaction mechanism and the controlled step were examined in the oxidation, and the expression of the reaction rate was determined. The reaction rate and ratio are low, and the temperature and the oxygen partial pressure have a little effect on the reaction rate and ratio. The reaction is controlled by oxygen absorption on the surface of Mn 2O 3 particles. Though the reaction thermodynamic condition is satisfied, it proceeds very hard because of the restriction of kinetics condition.