中国有色金属学报(英文版)
Transactions of Nonferrous Metals Society of China
| Vol. 4 No. 3 September 1994 |
（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
