PRODUCTION OF FIRED CERAMIC MATERIALS FROM FLY ASH WITH WITHERITE ADDITIVE

Year 2009, Volume: 9 Issue: 3, 45 - 52, 01.12.2009

Bahri Ersoy Taner Kavas Atila Evcin Serhat Başpınar Ali Sarıışık Sedef Dikmen

Abstract

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Keywords

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PRODUCTION OF FIRED CERAMIC MATERIALS FROM FLY ASH WITH WITHERITE ADDITIVE

Abstract

In this study, the effect of witherite (BaCO3) addition on the sintering of lignite coal fly ash taken from
the Seyitömer power plant of Kütahya/Turkey was examined at temperatures of 1100, 1150 and 1200
0
C in air atmosphere. Bloating of the fly ash samples sintered at 1150 0
C was prevented by shifting
the decomposition temperature of CaSO4 in the fly ash to a higher temperature, and their physicomechanical properties (porosity, water absorption, bulk density and bending strength) were improved
with BaCO3 addition owing to the phase transformation from CaSO4 (anhydrite) to BaSO4 (Barite) as
supported by XRD analysis. Positive effects of BaCO3, however, were not seen on the fly ash samples
sintered at 1100 0
C. All the fly ash samples sintered at 1200 0
C were bloated due to the gas evolving
during the thermal decomposition metal sulphates, and also they melted. 

Keywords

Coal fly ash, Witherite, Sintering, XRD

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