The Use of Thermo-Gravimetric Studies for the Assessment of Technological Properties of Quartzites for the Ferrosilicon Smelting Process

Abstract:

The most objective methods of determining the usefulness of quartzite for the ferrosilicon smelting process are industrial research methods, but such studies are long-lasting and costly. In order to test the usefulness of thermo-gravimetric method to evaluate technological properties of quartzites in a laboratory, thermo-gravimetric studies of quartzites samples from various deposits were carried out. These quartzites are used or were used as a raw material in industrial ferrosilicon process. The study consisted of measuring the weight loss of powder samples in the form of mixture of quartz with graphite of molar ratio SiO₂ + 3C during heating under an argon atmosphere in the temperature range up to 1500°C. The evaluation of technological properties of quartzites was done by comparing the curves of relative weight loss with industrial technological data of the ferrosilicon smelting process. It was established that the results of thermo-gravimetric studies show satisfying agreement with observations of industrial process, whereas quartzites of improved technological properties revealed a lower weight loss in thermo-gravimetric studies. Studies of this type can be useful as one of the methods of objective assessment of usefulness of quartzites for the ferrosilicon smelting process.

• Periodical: Solid State Phenomena (Volume 246)
• Pages: 63-66
• DOI: https://doi.org/10.4028/www.scientific.net/SSP.246.63
• Online since: February 2016
• Authors: Janusz Węgrzyn*, Bolesław Machulec
• Keywords: Ferrosilicon, Quartzite, Thermo-Gravimetric Research

References

[1] K. Aasly, Properties and behavior of quartz for the silicon process, thesis for PhD, Norwegian University of Science and Technology, Faculty of Engineering Science and Technology, Trondheim, August (2008).

[2] E. Ringdalen, Changes in Quartz During Heating and the Possible Effects on Si Production, JOM 67 (2) (2015).

DOI: 10.1007/s11837-014-1149-y

[3] B. Machulec, W. Bialik, Effects of Raw Material Contaminants on the Ferrosilicon Melting Process in the Submerged Arc Furnace, Solid State Phenom. 212 (2013) 183-186.

DOI: 10.4028/www.scientific.net/ssp.212.183

[4] G. Kopeć, R. Przeliorz, J. Ochman, W. Bialik, Laboratory studies the technological properties of quartzites as raw material for smelting ferrosilicon electrothermal process, Hutnik 79 (12) (2012) 834-836.

[5] G. Kopeć, R. Przeliorz, Usefulness of Quartzites for the Production of Ferrosilicon, Solid State Phenom. 226 (2015) 111-114.

DOI: 10.4028/www.scientific.net/ssp.226.111

[6] B. Machulec, The theoretical basis of electrothermal smelting process of ferro-silicon and silicon technically pure (in Polish), Ed. Politechnika Śląska, Monography No. 1589, Gliwice (2003).

[7] J. Węgrzyn, Comparison of mass loss rate in reaction of silica with carbon from different investigation results, Metalurgija 54 (3) (2015) 579-582.