REWAS 2019 pp 207-213 | Cite as

Production of High-Purity Mo and Fe–Mo Alloys from Recycled Mo Oxide and Mill Scale Through Hydrogen Reduction

  • Min-Kyu Paek
  • Do-Hyeong Kim
  • Daniel Lindberg
  • Jong-Jin PakEmail author
Conference paper
Part of the The Minerals, Metals & Materials Series book series (MMMS)


The present study handled an economic and clean route for the synthesis of pure Mo and Fe–Mo alloys through utilization of waste materials such as spent acid containing Mo and mill scale removed from the surface of steel slabs. The Mo oxide, MoO3, was successfully synthesized from the spent acid by ammonia gas neutralization method and reduced under hydrogen atmosphere to produce a high-purity Mo powder. The optimum condition for the spherical shape and uniform particle size of Mo powder was determined. In addition, the recycled MoO3 from the spent acid was mixed with mill scale as an iron oxide source to produce Fe–Mo alloy by the hydrogen reduction. Based on the thermogravimetric analysis, the reduction rate of the mixed MoO3 and mill scale was measured at 700–1100 °C. The Arrhenius equation with the approved mathematical formulations for the heterogeneous gas–solid reaction was applied to calculate the activation energy (Ea) values and determine the rate controlling mechanisms.


Spent acid Mill scale MoO3 Hydrogen reduction Fe–Mo alloy Reduction kinetics 


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Copyright information

© The Minerals, Metals & Materials Society 2019

Authors and Affiliations

  • Min-Kyu Paek
    • 1
  • Do-Hyeong Kim
    • 2
  • Daniel Lindberg
    • 1
  • Jong-Jin Pak
    • 2
    Email author
  1. 1.Department of Chemical and Metallurgical EngineeringAalto UniversityEspooFinland
  2. 2.Department of Materials EngineeringHanyang University, ERICAAnsanKorea

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