Refractory metals recovery from industrial wastes

Tran Van Long, Hironori Murase, Takahiro Miki, Yasushi Sasaki, Mitsutaka Hino

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Refractory metals like Mo and V are alloyed in the special steels like heat-resisting, tool, ship and pipe steels for the improvement of their physical and mechanical properties. Most of refractory metals are refined as by-products in the other metals production processes. Recently, it becomes difficult to open new mines up for the environmental pollution issues, and as the results, it pays attention to recover them from industrial wastes as Mo and V resources instead of new mines development, because these wastes contain higher MoS2 in spent lubricant, MoO3 in oil refining catalysis and V2O5 in an domestic heavy oil combustion ash than the natural minerals containing them. In the present work, it was tried that these refractory metals was recovered as Fe-alloys because more than 80% of refractory metals are used as steel alloying elements and the energy consumption for reduction and production to Fe-alloys are less than that of pure refractory metals production. At first, the recover principal of Fe-Mo alloy from spent lubricant, in which Mo existed as MoS2, was experimentally established via their oxidizing roast and reduction processes at 1773K based on the knowledge of Cu process metallurgy. The spent lubricant mixed with CaCO3, Fe3O4 and C was reduced in a Cgr. crucible at 1773K. The mixed sample melted completely and separated into slag and metal phases. In the second step, the recovery of Fe-V alloy from V2O5 in the combustion ash of Orinoco tar was tried. The ash mixed with CaO and C was reduced in a Cgr. crucible at 1773K. The mixed sample melted completely and separated into slag and metal containing vanadium carbide. V was not almost observed in slag phase, and it meant that most of V in ash was recovered as vanadium carbides into the metal phase. The metal was Fe-Ni alloy. In the present work, Fe-Ni-V-C quo-ternary isothermal section phase diagram was experimentally assembled at 1773K. As the result, 53.3mass%Fe-42.2mass%Mo-4.3mass%C alloy from spent lubricant and 37.4mass%Fe-46.4mass%Ni-12.3mass%Si-2.1mass%C alloy - VxCy mixture from Orinoco tar combustion ash by the reduction with carbonaceous materials were successfully recovered in the present work.

Original languageEnglish
Title of host publicationAdvances in Molten Slags, Fluxes, and Salts
Subtitle of host publicationProceedings of the 10th International Conference on Molten Slags, Fluxes and Salts 2016
EditorsRamana G. Reddy, Pinakin Chaubal, P. Chris Pistorius, Uday Pal
PublisherSpringer International Publishing AG
Pages29-40
Number of pages12
ISBN (Print)9783319486253
DOIs
Publication statusPublished - 2017
Event10th International Conference on Molten Slags, Fluxes and Salts, MOLTEN 2016 - Seattle, United States
Duration: 2016 May 222016 May 25

Publication series

NameAdvances in Molten Slags, Fluxes, and Salts: Proceedings of the 10th International Conference on Molten Slags, Fluxes and Salts 2016

Conference

Conference10th International Conference on Molten Slags, Fluxes and Salts, MOLTEN 2016
CountryUnited States
CitySeattle
Period16/5/2216/5/25

Keywords

  • Combustion ash
  • Fe-Ni-V-C quo-ternary phase diagram
  • Industrial waste
  • Molybdenum
  • Orinoco tar
  • Recover
  • Spent lubricant
  • Vanadium

ASJC Scopus subject areas

  • Mechanical Engineering
  • Mechanics of Materials
  • Materials Chemistry
  • Metals and Alloys

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