The effect of Fe addition on high temperature transformations of specific silica sources

Authors : Cengiz BAGCI, Murat ZENGİN, Burak KAYA, Özgür GÜVEN

Pages : 304-309

View : 29 | Download : 46

Publication Date : 2023-08-31

Article Type : Research Paper

Abstract :Alternative sources of silica, most abundant in the earth\`s crust, are converted into useful high-temperature crystalline phases. In this study, temperature dependent phase transformations of silica sand and rice husk sourced silica with and without the addition of 10 % by weight elemental iron were investigated. For this purpose, firstly, the initial silica sources were calcined at 700 °C for 2 hours, ground into fine powder and placed on a carbon substrate and heat treated in a tube furnace at 1500 °C for 2 hours in argon atmosphere. The phase transformation characteristics of the final material were made by XRD and SEM analysis. A mixture of cristobalite-tridymite and high purity cristobalite were observed in silica sand with and without Fe addition, respectively. In the same order, XRD phase pure tridymite and cristobalite phases were observed in rice husk ash. As a result, XRD phase pure or tailored transformations of these crystalline phases were obtained depending on the Fe addition and silica source.
Keywords : Silika kumu, pirinç kabuğu, kristobalit, tridimit