Properties of molybdenum powders obtained by reduction in moving beds

We have studied the process of decomposition of ammonium paramolybdate and reduction of the molybdenum oxides in moving beds with rotation of the working chamber. We have shown that agglomerated disperse molybdenum powders are formed under these conditions. Movement of powder beds during reduction ensures continuous contact between the oxides being reduced and the hydrogen, rapid removal of water vapor from the reaction zone, and establishment of nearly kinetic reduction conditions. As a result the metallic molybdenum powders are strong, highly porous agglomerates, similar to the MoO3 particles in size and shape. The powders have high bulk (as-poured) density and good flowability, and their dispersity depends only on the reduction temperature.