THERMAL DECOMPOSITION OFAMMONIUM MOLYBDATE MIXTURE

ISSN: 1003-6326
CN: 43-1239/TG
CODEN: TNMCEW

Vol. 4 No. 3 September 1994

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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

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