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Abstract

Aspects in Mining & Mineral Science

Reaction Rates of 2SiO2+SiC=3SiO+CO in Pellets at Elevated Temperatures

  • Open or CloseMerete Tangstad*

    Jafar Safarian, NTNU, Material Science and Engineering, Norway

    *Corresponding author: Merete Tangstad, NTNU, Material Science and Engineering, Jafar Safarian, Norway

Submission: May 31, 2019; Published: July 09, 2019

DOI: 10.31031/AMMS.2019.03.000558

ISSN : 2578-0255
Volume3 Issue2

Abstract

The reaction rate for the reaction 2SiO2+SiC=3SiO+CO has been measured for various polymorphs of SiO2, for various gas atmospheres and in a temperature area from 1923-2273K (1650-2000 °C). It has previously been theorized that cristobalite has a higher reaction rate compared to quartz, but it was found that there was no difference between the polymorphs quartz or cristobalite. The activation energy was found to be between 424-464kJ/mole and the reaction rate was found to be expressed by the equation where α is the fraction of the sample reacted, varying from 0 to 1. The term 1.9·108 represent the reaction area times the reaction constant. if the area of SiO2 determines the reaction rate or if the SiC determines the reaction area. In some of the experiments the SiO2:SiC ratio was measured after the experiment and it was seen that some side reactions, like elemental silicon formation, would also take place.

Keywords: Polymorphs; Silicon; Conductivity; Raw materials; Temperature

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