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High-temperature thermal analysis study of the reaction between magnesium oxide and silica

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Abstract

The reaction between SiO2 and MgO at temperatures up to 1500°C was studied using thermal analysis, with X-ray diffraction being used to identify reaction products. The reaction is slow and results in the formation of Mg2SiO4 and MgSiO3, with minor amounts of SiO2·nH2O and residual amounts of unreacted SiO2 and MgO. Complete reaction of the starting materials to form Mg2SiO4 can only be achieved by maintaining the mixture at 1500°C for extended periods of time (>1 h).

Zusammenfassung

Mittels Thermoanalyse und Röntgendiffraktion (zur Identifizierung der Reaktionsprodukte) wurde die Reaktion zwischen SiO2 und MgO bei Temperaturen bis zu 1500°C untersucht. Es handelt sich um eine langsam verlaufende Reaktion, welche neben geringen Mengen von SiO2·nH2) und unreagierten Restmengen von SiO2 und MgO die Bildung von Mg2SiO4 und MgSiO3 zur Folge hat. Eine vollständige Reaktion des Ausgangsmateriales zu Mg2SiO4 kann nur durch ein längeres (1 h) Behandeln der Probe bei 1500°C erreichen.

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Mikhail, S.A., King, P.E. High-temperature thermal analysis study of the reaction between magnesium oxide and silica. Journal of Thermal Analysis 40, 79–84 (1993). https://doi.org/10.1007/BF02546557

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  • DOI: https://doi.org/10.1007/BF02546557

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