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Reduction of Mixtures of Ni-Oxide and Ti-Oxide Powder in a Natural Gas Containing Atmosphere

  • Casper van der Eijk
  • Kai Tang
Conference paper

Abstract

Natural gas has been used as reductant in the production of iron for several decades. Recently, the use of natural gas as reductant for other metals has been drawing attention because of the low price of natural gas, as well as the reduction of CO2 emissions compared to the use of coke and coal. In this work, the reduction of a mixture of Ti- and Ni-oxides by natural gas has been studied. Within the Ni-Ti system, the intermetallic compound Ni3 Ti is thermodynamically the most stable one. Therefore, powders of Ni-oxide and Ti-oxides were mixed in an atomic ratio of three to one and subsequently pelletized. Reduction was performed in a TGA furnace at constant temperature with varying reducing gas atmospheres.

In a natural gas containing atmosphere, the Ni-oxide was easily reduced to metallic nickel while the Ti was reduced to Ti-oxycarbides or Ti-oxynitride when nitrogen was present. Depending on the process parameters, several percent of Ti was dissolved in the nickel-based solid phase.

Keywords

Natural gas Reduction Ni-oxide Ti-oxide Ni3Ti 

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References

  1. 1.
    H. Sekimoto et al., “Reduction of Titanium Oxide to Titanium Alloy by Hydrogen” (Paper presented at the 3rd Workshop on Reactive Metal processing, March 2–3, 2007, Massachusetts Institute of Technology, Cambridge, MA, USA).Google Scholar
  2. 2.
    H. Sekimoto et al., “Reduction of Titanium Oxide in the Presence of Nickel by Nonequilibrium Hydrogen Gas”, Journal of Material Research, 24 (7) (2009), 2391–2399.CrossRefGoogle Scholar
  3. 3.
    A. Qiu et al., “Calculation of phase diagram of Ti-Ni-O system and application to deoxidation of TiNi alloy”, Trans. Nonferrous Met. Soc. China, 21 (2011), 1808–1816.CrossRefGoogle Scholar

Copyright information

© TMS (The Minerals, Metals & Materials Society) 2014

Authors and Affiliations

  • Casper van der Eijk
    • 1
  • Kai Tang
    • 1
  1. 1.SINTEF Materials and ChemistryTrondheimNorway

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