The effect of BaCOb>3b> addition on the sintering behavior of lignite coal fly ash

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• 作者：B. Ersoy ; T. Kavas ; A. Evcin ; S. Baş ; pı ; nar ; A. Sarı ; ı ; ş ; ı ; k ; G. Ö ; nce
• 关键词：Coal fly ash ; BaCOb>3b> ; Sintering ; XRD ; Electron microscopy
• 刊名：Fuel
• 出版年：2008
• 期刊代码：33_00162361
• 类别：ce
• 出版时间：September 2008
• 卷：87
• 期：12
• 页码：2563-2571
• 文件大小：1430 K

摘要

The effect of BaCOb>3b> (witherite) addition on the sintering behavior of lignite coal fly ash taken from the Seyitömer power plant of Kütahya/Turkey was examined at temperatures of 1100, 1150 and 1200 °C in air atmosphere. Bloating of the fly ash samples sintered at 1150 °C was prevented, that is, the decomposition temperature of CaSOb>4b> in the fly ash is shifted to a higher temperature, and their physico-mechanical properties (porosity, water absorption, bulk density and bending strength) were improved with BaCOb>3b> addition. Positive effects of BaCOb>3b>, however, were not seen on the fly ash samples sintered at 1100 °C. All the fly ash samples sintered at 1200 °C were bloated due to the gas evolving and also they melted. During the thermal treatment at 1150 °C a phase transformation from CaSOb>4b> (anhydrite) to BaSOb>4b> (Barite) occurred in the fly ash with BaCOb>3b> addition as seen from the X-ray diffraction (XRD) patterns and the bar shaped fly ash samples with BaCOb>3b> saved their structural integrity up to 1150 °C.