Cristin-resultat-ID: 2019668
Sist endret: 1. mai 2022, 13:28
NVI-rapporteringsår: 2022
Resultat
Vitenskapelig artikkel
2022

Magnesiothermic Reduction of Natural Quartz

Bidragsytere:
  • Azam Rasouli
  • Karl Edvin Herstad
  • Jafar Safarian og
  • Gabriella Tranell

Tidsskrift

Metallurgical and Materials Transactions B
ISSN 1073-5615
e-ISSN 1543-1916
NVI-nivå 2

Om resultatet

Vitenskapelig artikkel
Publiseringsår: 2022
Publisert online: 2022
Open Access

Importkilder

Scopus-ID: 2-s2.0-85128381551

Beskrivelse Beskrivelse

Tittel

Magnesiothermic Reduction of Natural Quartz

Sammendrag

In the current work, the metallothermic reduction of natural quartz by magnesium has been studied at 1373 K under different reaction conditions, i.e. quartz type, quartz particle size, Mg:SiO2 mole ratio and reaction time. The microstructure of reaction products was studied to illustrate the reaction progression through scanning and transmission electron microscopy techniques. X-ray diffraction analysis with Rietveld phase quantification was used to calculate the change in the amount of phases at different reaction conditions. The results showed that the Mg:SiO2 mole ratio strongly affects reaction mechanism and product characteristics such as phase content and microstructure. At lower Mg:SiO2 mole ratios, the reaction rate is fast at the beginning and the formation of a product layer consisting of different phases such as MgO, Si, Mg2Si, Mg2SiO4 and MgSiO3 around quartz particles limits the Mg diffusion. This phenomenon is more noticeable for larger quartz particle sizes where Mg should diffuse longer distance towards the quartz core to react with it. At higher Mg:SiO2 mole ratios, a significant amount of Si–Mg liquid alloy is formed during reaction where the high mobility of Mg in this liquid phase and cracking of quartz particles result in significantly higher reaction rate. Here the formation of intermediate phases is not significant and the products would be the mixture of MgO, Mg2Si, and either Si or Mg phases.

Bidragsytere

Azam Rasouli

  • Tilknyttet:
    Forfatter
    ved Institutt for materialteknologi ved Norges teknisk-naturvitenskapelige universitet

Karl Edvin Herstad

  • Tilknyttet:
    Forfatter
    ved Institutt for materialteknologi ved Norges teknisk-naturvitenskapelige universitet

Jafar Safarian

  • Tilknyttet:
    Forfatter
    ved Institutt for materialteknologi ved Norges teknisk-naturvitenskapelige universitet
  • Tilknyttet:
    Forfatter
    ved Metallproduksjon og prosessering ved SINTEF AS

Gabriella Tranell

  • Tilknyttet:
    Forfatter
    ved Institutt for materialteknologi ved Norges teknisk-naturvitenskapelige universitet
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