Abstract
Ammonium dimolybdate ((NH4)2Mo2O7) or molybdenum trioxide (MoO3) is used as starting raw materials for manufacturing Mo powders. In the initial step, usually carried out in rotary calciners, (NH4)2Mo2O7 or MoO3 is reduced to MoO2. Agglomeration of powder due to melting of eutectic formed between MoO3 and Mo4O11 and due to melting of MoO3 occurs during this reduction step resulting in several manufacturing issues. The reduction from (NH4)2Mo2O7 involves an endothermic reaction however, reduction of MoO3 occurs only by exothermic reaction. It is hypothesized that addition of (NH4)2Mo2O7 to MoO3 will decrease agglomeration of powders due to the endothermic reaction involved in the reduction process. The current paper details experiments carried out to verify the hypothesis. MoO3 containing varying amounts (NH4)2Mo2O7 were reduced at 550°C, 650°C and 750°C in hydrogen atmosphere. The results show lower agglomeration of powder with addition of (NH4)2Mo2O7. The thermal analysis results confirm reduction of MoO3 at lower temperatures with the addition of (NH4)2Mo2O7.
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