Belirli Silika Kaynaklarının Yüksek Sıcaklık Dönüşümlerinde Fe İlavesinin Etkisi

Abstract

Alternatif silika kaynakları yer kabuğunda bol bulunduklarından, yararlı yüksek sıcaklıkta kristal fazlara dönüştürülürler. Bu çalışmada, ağırlıkça % 10 elemental demir katkılı ve katkısız silis kumu ve pirinç kabuğu esaslı silislerin sıcaklığa bağlı faz dönüşümleri incelenmiştir. Bu amaçla, ilk olarak başlangıç silika kaynakları 700 °C' de 2 saat kalsine edilmiş, ince toz haline getirilmiş ve bir karbon altlık üzerine yerleştirildikten sonra argon atmosferinde 1500 °C'de bir tüp fırında 2 saat ısıl işleme tabi tutulmuştur. Nihai malzemenin faz dönüşüm karakteristikleri XRD ve SEM analizi ile yapılmıştır. Fe katkili ve katkisiz silis kumunda sırasıyla bir kristobalit-tridimit karışımı ve yüksek saflıkta kristobalit gözlenmistir. Aynı sıra ile pirinç kabuğu külünde XRD faz saf tridimit ve kristobalit fazları gözlenmiştir. Sonuç olarak, Fe katkisina ve silis kaynağına bağlı olarak bu kristal fazların XRD faz saf veya uyarlanmış dönüşümleri elde edilmistir.

Keywords

• Silika kumu
• pirinç kabuğu
• kristobalit
• tridimit

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

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

• silica sand
• rice husk
• cristobalite
• trdymite

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