Decomposition reaction kinetics of Baotou RE concentrate with concentrated sulfuric acid at low temperature

稀有金属（英文版）, 2010, 29(2): 121-125. doi: 10.1007/s12598-010-0021-7

^1, , ^2, , ^3, , ^4, , ^5,

1.Department of Chemistry, University of Science and Technology Beijing, Beijing 100083, China

2.Department of Chemistry, University of Science and Technology Beijing, Beijing 100083, China

3.School of Materials and Metallurgy, Inner Mongolia University of Science and Technology, Baotou 014110, China

4.Department of Chemistry, University of Science and Technology Beijing, Beijing 100083, China

5.Department of Chemistry, University of Science and Technology Beijing, Beijing 100083, China

基金项目: This study was financially supported by the National Natural Science Foundation of China(20877008) the program for New Century Excellent Telents in University of the Ministry of Education of China(20407003)

Decomposition reaction kinetics of Baotou RE concentrate with concentrated sulfuric acid at low temperature

WANG Xiuyan ^1, , LIU Jiemin ^2, , LI Mei ^3, , FAN Huili ^4, , YANG Qishan ^5,

1.Department of Chemistry, University of Science and Technology Beijing, Beijing 100083, China

2.Department of Chemistry, University of Science and Technology Beijing, Beijing 100083, China

3.School of Materials and Metallurgy, Inner Mongolia University of Science and Technology, Baotou 014110, China

4.Department of Chemistry, University of Science and Technology Beijing, Beijing 100083, China

5.Department of Chemistry, University of Science and Technology Beijing, Beijing 100083, China

Keywords： roasting

Baotou RE concentrate was decomposed with concentrated sulfuric acid by controlling the roasting temperature below 500℃. Thermogra-vimetry-differential thermal analysis (TG-DTA) and chemical analytical methods were used to study the thermal decomposition process and the thermal decomposition effect. The Freeman-Carroll method was applied to analyze the TG-DTA curves. The activation energy, reaction order, and reaction frequency factor at different stages were calculated. The Satava method was used to deduce the reaction mechanism and the relative reaction rate during the thermal decomposition process.

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