Preparation of high purity MoO3 through volatilization of technical-grade Mo calcine in water vapor atmosphere

Cost-Effective and Sustainable Preparation of Porous Mullite-Based Ceramics Combining MoO3 Recovery from Industrial Calcine

“…The reason may be that MoO 3 is more difficult to volatilize in the real system due to the presence of impurities; therefore, some MoO 3 is left in the ceramic and recombines with Al 2 O 3 during cooling. 13 (5) (7)…”

“…In the traditional process, MoO 3 is usually wrapped by dense impurities so that it is hard to migrate to the gasifying interface. 13 Here, PMCs can provide a larger surface to scatter the melted calcine and, thus, create more gas−liquid interfaces. Even in the later stage of volatilization, MoO 3 can pass through shorter routes to escape the covering because impurities are not severely agglomerated as the traditional system.…”

“…Another route only includes a single-step roasting (1000−1100 °C) to volatilize MoO 3 from melted calcine. 13 Despite the facile operation, the recovery efficiency is only 65−85% due to the wrapping of MoO 3 by impurities at a later stage, and the melted calcine may cause corrosion of furnace linings. Besides, both of the two routes produce solid wastes, such as leaching residues or volatilizing slags.…”

“…Until now, research on MoO 3 recovery during PMC sintering has been lacking, but it can be assumed that most of the MoO 3 may combine with the impurities derived from matrix materials. ,, In general, pure MoO 3 is produced from industrial Mo calcine via two main routes. One includes multiple steps, such as ammonia leaching, purifying, precipitation, and roasting decomposition. , This route is complex but can recover most of the MoO 3 (over 95%).…”

“…One includes multiple steps, such as ammonia leaching, purifying, precipitation, and roasting decomposition. , This route is complex but can recover most of the MoO 3 (over 95%). Another route only includes a single-step roasting (1000–1100 °C) to volatilize MoO 3 from melted calcine . Despite the facile operation, the recovery efficiency is only 65–85% due to the wrapping of MoO 3 by impurities at a later stage, and the melted calcine may cause corrosion of furnace linings.…”