微波促进MnO_2分解的动力学  

MICROWAVE ASSISTED DECOMPOSITION KINETICS OF MnO 2

作　　者：华一新[1] 刘纯鹏[1] 乐莉[2] 

机构地区：[1]昆明理工大学冶金系 [2]昆明冶金高等专科学校

出　　处：《中国有色金属学报》1998年第3期497-501,共5页The Chinese Journal of Nonferrous Metals

基　　金：中国有色金属工业总公司资助项目

摘　　要：将微波加热用于从ＭｎＯ２制备Ｍｎ３Ｏ４，测定了ＭｎＯ２和Ｍｎ３Ｏ４的微波加热升温速率，并用差重法研究了在空气气氛中８７３～１２７３Ｋ之间ＭｎＯ２分解过程的动力学。结果表明，ＭｎＯ２很容易被微波加热，而Ｍｎ３Ｏ４则几乎不吸收微波；ＭｎＯ２分步进行分解：ＭｎＯ２→Ｍｎ２Ｏ３→Ｍｎ３Ｏ４，其中第一步的速率受通过产物层的传热控制，第二步受化学动力学控制。用微波代替传统方式加热能显著地提高分解反应的速率，并能够降低过程的能耗。Microwave heating was used to prepare Mn 3O 4 from MnO 2. The microwave heating rate of MnO 2 and Mn 3O 4 was directly determined, and the kinetics of decomposition process of MnO 2 was investigated by gravimetric analysis under air atmosphere in the temperature range of 873～1 273 K. It is demonstrated that MnO 2 can be heated well by microwaves, while Mn 3O 4 can not. The decomposition of MnO 2 is consisted of two steps: MnO 2→Mn 2O 3→Mn 3O 4, in which the first step is controlled by heat transfer through the product layer and the second by chemical kinetics. When using microwaves instead of conventional heating, the decomposition rate was significantly enhanced and the energy consumption for the process was reduced.

关 键 词：微波 分解动力学 二氧化锰 四氧化三锰 炼锰 

分 类 号：TF792[冶金工程—钢铁冶金]