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 Pak*

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingChapterScientificpeer-review

2 Citations (Scopus)


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, MoO 3 , 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 MoO 3 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 MoO 3 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.

Original languageEnglish
Title of host publicationREWAS 2019 : Manufacturing the Circular Materials Economy
Number of pages7
ISBN (Electronic)978-3-030-10386-6
ISBN (Print)978-3-030-10385-9
Publication statusPublished - 15 Feb 2019
MoE publication typeA3 Book section, Chapters in research books

Publication series

NameMinerals, Metals and Materials Series
ISSN (Print)2367-1181
ISSN (Electronic)2367-1696


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


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