Kinetics of Mixed Rare Earths Minerals Decomposed by CaO with NaCl-CaCl2 Melting Salt

Bian Xue; Wu Wenyuan

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Kinetics of Mixed Rare Earths Minerals Decomposed by CaO with NaCl-CaCl2 Melting Salt

Bian Xue * #,Wu Wenyuan #

School of Material and Metallurgy, Northeastern University

*Correspondence author

#Submitted by

Subject:

Funding: Scientific Research special Foundation of Doctor subject of Chinese Universities（No.20090042120015）, The Fundamental Research Funds for the Central Universities（No.N090302007）, National Natural Science Foundation of China （No.50974042）

Opened online:22 November 2010

Accepted by: none

Citation: Bian Xue,Wu Wenyuan.Kinetics of Mixed Rare Earths Minerals Decomposed by CaO with NaCl-CaCl2 Melting Salt[OL]. [22 November 2010] http://en.paper.edu.cn/en_releasepaper/content/4391731

For increasing reaction rate and reducing decomposing temperature, TG-DTA, XRD, SEM and Chemical analysis were used to study the kinetics of mixed rare earths minerals decomposed by CaO with NaCl-CaCl2. The results showed that the reaction rate increased with increasing of NaC-CaCl2 addition, CaO addition, and decomposition temperature. The kinetics of mixed rare earths minerals decomposed by CaO conformed to 1-2/3X-(1-X)2/3=kdt mode. The decomposition reaction rate was controlled by two steps, and the activation energy was decreased with adding of NaCl-CaCl2 melting salt. The micro-pattern of products was loosening and porous with NaCl-CaCl2 in decomposition system.

Keywords:Mixed rare earths minerals; CaO-NaCl-CaCl2; kinetics; decomposition

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