Abstract
Coal fly ash (CFA) is a waste by-product of coal combustion. Kazakhstan has vast coal deposits and is major consumer of coal and hence produces huge amounts of CFA annually. The government aims to recycle and effectively utilize this waste by-product. Thus, a detailed study of the physical and chemical properties of material is required as the data available in literature is either outdated or not applicable for recently produced CFA samples. The full mineralogical, microstructural and thermal characterization of three types of coal fly ash (CFA) produced in two large Kazakhstani power plants is reported in this work. The properties of CFAs were compared between samples as well as with published values.
Highlights
Coal fly ash (CFA) is a waste by-product from coal combustion in power plants all over the world
It should be noted that the amount of magnetite/hematite present in CFAs was not detected on this instrument because it is mostly amorphous and only crystalline particles of this phase was used in percentile calculation of software
The results reveal that in total the sample loss was 0.85 mg or 2.4wt.% that is almost 2 times lower than in E-CFA, which in turn means that M-CFA coal absorbed less water phase and contains less volatile organic matters in its structure
Summary
Coal fly ash (CFA) is a waste by-product from coal combustion in power plants all over the world. The utilization rate of CFA in Kazakhstan is under 10%, which is considerably lower as compared to EU states (over 90%), India (60%), China (67%) and the USA (nearly 50%) [1, 3]. Characterization of this material is of utmost importance as it determines how and in which sectors of industry it could be utilized. The Particle Size Analyzer (PSA) and Porosimetric analysis were used to estimate the particle size groups present in crude CFAs, their respective specific surface area, average pore size and total pore volume
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