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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 4    No. 3    September 1994

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THERMAL DECOMPOSITION OFAMMONIUM MOLYBDATE MIXTURE
Yin Zhoulan1; Li Xinhai1 ;Zhao Qinsheng1 ;Chen Shaoyi1; Liu Guorong2; Wang Siqing2

1.Department of Non-ferrous Metallurgy; Department of Chemistry; Central South University of Technology; Changsha 4100083
2.Refractory Metal Branch; Baoji Non-ferrous Metal Works; Ba

Abstract:High temperature XRD and DTAITGA xvere employed to study the thermal decoinpositionof a commercial ammonium molybdate mixture which is used as the starting material for the pro-duction of molybdenum metal. Results show that the componenls in the mixture decompose sepa-rately at three temperatures according lo the following five steps:
(NH4)6Mo7O24·4H2O→(NH4)4Mo5O17→(NH4)2Mo4O13;
(NH4)2Mo4O13 and β- (NH4)2Mo4O13→(NH4)2Mo14O43→ (NH4)2Mo22O67→MoO3
The weight percentage of each component was evaluated from weight losses in TGA curve.

 

Key words: ammonium molybdate thermal decomposition XRD DTA TGA

ISSN 1672-7029
CN 43-1423/U

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