Abstract
In this work, the kinetics of natural quartz reduction by Mg to produce either Si or Mg2Si was studied through quantitative phase analysis. Reduction reaction experiments were performed at various temperatures, reaction times and Mg to SiO2 mole ratios of 2 and 4. Rietveld refinement of X-ray diffraction patterns was used to obtain phase distributions in the reacted samples. SEM and EPMA examinations were performed to evaluate the microstructural change during reduction. The results indicated that the reduction reaction rate was slower at a mole ratio of 2 than 4 at the same temperature, as illustrated by the total amount of Si formed (the percent of Si that is reduced to either Si or Mg2Si to total amount of Si) being 59% and 75%, respectively, after 240 min reaction time for mole ratios of 2 and 4. At the mole ratio of 4, the reaction rate was strongly dependent on the reaction temperature, where SiO2 was completely reduced after 20 min at 1273 K. At the lower temperatures of 1173 and 1073 K, total Si formed was 75% and 39%, respectively, after 240 min reaction time. The results of the current work show that Mg2Si can be produced through the magnesiothermic reduction of natural quartz with high yield. The obtained Mg2Si can be processed further to produce silane gas as a precursor to high purity Si. The combination of these two processes offers the potential for a more direct and low carbon method to produce Si with high purity.
Funder
Research Centre for Sustainable Solar Cell Technology (FME SuSolTech) co-sponsored by the Norwegian Research Council and industry partners
Subject
General Materials Science
Reference55 articles.
1. Method for the Manufacture of Pure Silicon Metal and Amorphous Silica by Reduction of Quartz (SiO2);Sorvik;WO Patent,2007
2. Silicon carbide formation from methane and silicon monoxide
3. Greenhouse Gas Emissions from Silicon Production -Development of Carbon Footprint with Changing Energy Systems
4. Possible Use of Natural Gas for Silicon or Ferrosilicon Production;Monsen;Proceedings of the 13th International Ferroalloys Congress,2013
5. Duplex Process to Produce Ferromanganese and Direct Reduced Iron by Natural Gas
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