MnO2真空热还原制备MnO粉
毕业论文关键词：二氧化锰； 一氧化锰； 真空还原焙烧
ABSTRACT MnO is presented as a grass green cubic crystal powder or eight surface crystalsat room temperature ,it is widely used as a catalyst for the production of the alcohol and fatty acid, and the preparation of the raw material of the ferrite material。At present，the preparation methods of MnO mainiy include reduction roasting method and direct reduction leaching method。 Compared with the direct reduction leaching method, roasting method is used in large scale because of its simple equipment and easy preparation。In this paper, MnO2 and C were used as raw materials to prepare MnO under vacuum conditions。 The composition and crystal morphology of the prepared products were analyzed by using XRD and SEM。 The effects of different processing conditions (temperature, baking time, vacuum degree) and different reactant mass ratio on the product were studied to getting best roasting process conditions。 At the same time, the TG-DSC analysis was used to study the thermal decomposition behavior of the mixture of MnO2 and C, and to provide basic data and theoretical basis for the preparation of MnO。 The results showed that the optimum conditions for the preparation of MnO are 5 kpa, 850 ℃, 3 h, and the resulting product is flocculent。
Keywords：MnO2 ； MnO； Vacuum reduction roasting
目 录
第一章 绪论 1
1。1 一氧化锰的性质与用途 1
1。2 一氧化锰的制备工艺 2
1。2。1 煤还原焙烧 2
1。2。2 两矿焙烧法 4
1。2。3 直接还原浸出法 4
1。2。4 生物质热解法 6
1。3 选题背景 6
1。4 一氧化锰的应用前景 9
第二章 实验部分 10
2。1 实验原料与设备 10
2。1。1 实验原料 10
2。1。2 实验仪器和设备 10
2。2 实验内容 11
2。2。1 C与MnO2的混合物的差热分析 11
2。2。2 探究常压下不同反应温度对MnO2的还原产物的影响 11
2。2。3 探究真空还原焙烧对MnO2还原产物的影响 11
2。3 分析方法 13
2。3。1 热重/差热分析（TGA/DSC） 13
2。3。2 X粉末衍射（XRD） 13
2。3。3 扫描电镜(SEM) 13
2。3。4 能谱分析（EDS） 14
第三章 实验结果与讨论 15
3。1 C与MnO2混合物的热差分析 15
3。2 产品的物相分析 16
3。2。1 常压下MnO2的还原产物 16
3。2。2 真空还原焙烧温度不同时的还原产物 17
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