Thermal decomposition characteristics of low-grade rhodochrosite ore in N2, CO2 and air atmosphere

被引：4
|
作者：
Tu, Zhongbing [1 ]
Liang, Xiaoping [1 ]
Wu, Chengbo [1 ]
Wang, Yu [1 ]
机构：
[1] Chongqing Univ, Coll Mat Sci & Engn, Chongqing 400030, Peoples R China
来源：
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY | 2022年 / 147卷 / 11期
关键词：
Low grade; Atmosphere; Roasting; Phase transformation; Ammonia leaching; PHOSPHORUS MANGANESE ORES; REDUCTION; DIOXIDE; OXIDE; BIODIESEL; INDIA;
D O I：
10.1007/s10973-021-10974-1
中图分类号：
O414.1 [热力学];
学科分类号：
摘要：
Roasting is an essential process before ammonia leaching of low-grade rhodochrosite ore. Thermal decomposition characteristics and phase transformation rules of low-grade rhodochrosite ore with a particle size of less than 74 mu m in N-2, CO2 and air were studied. MnCO3, MgCO3 and CaCO3 in rhodochrosite are decomposed into MnO, MgO and CaO at 339 celcius, 306 celcius and 842 celcius, respectively. MnO is oxidized to MnO2, Mn2O3 and Mn3O4 at 339 celcius, 533 celcius and 1005 celcius, respectively. The TG/DTA and phase transformation results indicated that by thermal decomposition of rhodochrosite ore in air, N-2 and CO2, MnCO3 is converted into Mn2O3, MnO and MnO, respectively. MnCO3 is converted to MnO at a higher temperature in a carbon dioxide atmosphere (512 celcius) than in a nitrogen atmosphere (400 celcius).
引用
收藏
页码：6481 / 6488
页数：8
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