Size fraction characterisation of highly-calcareous and siliceous fly ashes

IF 3 3区 工程技术 Q2 CHEMISTRY, ANALYTICAL Journal of Thermal Analysis and Calorimetry Pub Date : 2024-10-03 DOI:10.1007/s10973-024-13566-x
Jurij Delihowski, Piotr Izak, Łukasz Wójcik, Marcin Gajek, Dawid Kozień, Marcin Jarosz
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Abstract

The properties of coal fly ash vary significantly depending on factors such as coal type, combustion conditions, and flue gas emission reduction methods. This study investigates the influence of particle size fractionation on the chemical composition, mineralogical structure, and thermal behaviour of two types of fly ash: high calcium ash derived from lignite (S1) and silica-rich ash from bituminous coal (S2). Dry aerodynamic separation was used to obtain distinct size fractions, which were then subjected to a comprehensive characterisation including X-ray fluorescence, X-ray diffraction, scanning electron microscopy, and thermal analysis. The results reveal notable differences between the S1 and S2 ashes and between their size fractions. The finer fractions (< 20 μm) of S1 showed an increased calcium and sulphur content, while the coarser fractions (> 100 μm) contained more silica and alumina. The S2 ash exhibited a higher overall silica content, with alkali metals concentrated in finer fractions. Thermal analysis demonstrated distinct behaviours for each type and fraction of ash. Fine fractions of S1 ash showed SO2 emission at elevated temperatures, while S2 ash exhibited greater CO2 gas emission. After thermal treatment, the recrystallisation of the glassy phase was observed for S1, while the S2 ashes were more prone to melting and agglomeration. The study highlights the potential for the customised utilisation of specific ash fractions in various applications, such as geopolymer synthesis, adsorbent materials, and refractory products. This comprehensive characterisation contributes to a better understanding of fly ash properties and their dependence on particle size, providing valuable insights to optimise fly ash utilisation in various industries. The findings suggest strategies for a more efficient use of fly ash resources, particularly relevant in the context of decreasing fly ash availability due to the phase-out of coal power plants.

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高石灰质和硅质飞灰的粒度特征
粉煤灰的性质因煤种、燃烧条件和烟气减排方法等因素的不同而有很大差异。本研究调查了粒度分馏对两种粉煤灰的化学成分、矿物结构和热性能的影响:褐煤产生的高钙粉煤灰(S1)和烟煤产生的富硅粉煤灰(S2)。采用干式空气动力分离法获得不同粒度的分馏物,然后对其进行综合表征,包括 X 射线荧光、X 射线衍射、扫描电子显微镜和热分析。结果显示,S1 和 S2 灰烬之间以及它们的粒度馏分之间存在明显差异。S1 灰的较细馏分(20 微米)显示钙和硫含量增加,而较粗馏分(100 微米)则含有更多的二氧化硅和氧化铝。S2 灰的二氧化硅总含量较高,碱金属则集中在较细的馏分中。热分析表明,每种类型和馏分的灰都有不同的行为。S1 灰的细馏分在高温下会释放出二氧化硫,而 S2 灰则会释放出更多的二氧化碳气体。经过热处理后,S1 灰的玻璃相出现重结晶,而 S2 灰则更容易熔化和结块。这项研究强调了在土工聚合物合成、吸附材料和耐火产品等各种应用中定制利用特定灰分的潜力。这种全面的表征有助于更好地了解粉煤灰的特性及其与粒度的关系,为优化粉煤灰在各行业中的利用提供了宝贵的见解。研究结果提出了更有效利用粉煤灰资源的策略,尤其是在煤电厂淘汰导致粉煤灰供应量减少的情况下。
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来源期刊
CiteScore
8.50
自引率
9.10%
发文量
577
审稿时长
3.8 months
期刊介绍: Journal of Thermal Analysis and Calorimetry is a fully peer reviewed journal publishing high quality papers covering all aspects of thermal analysis, calorimetry, and experimental thermodynamics. The journal publishes regular and special issues in twelve issues every year. The following types of papers are published: Original Research Papers, Short Communications, Reviews, Modern Instruments, Events and Book reviews. The subjects covered are: thermogravimetry, derivative thermogravimetry, differential thermal analysis, thermodilatometry, differential scanning calorimetry of all types, non-scanning calorimetry of all types, thermometry, evolved gas analysis, thermomechanical analysis, emanation thermal analysis, thermal conductivity, multiple techniques, and miscellaneous thermal methods (including the combination of the thermal method with various instrumental techniques), theory and instrumentation for thermal analysis and calorimetry.
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