Mokrzycki Jakub, Baran Paweł, Gazda-Grzywacz Magdalena, Bator Jakub, Wróbel Wojciech, Zarębska Katarzyna
Department of Coal Chemistry and Environmental Sciences, Faculty of Energy and Fuels, AGH University of Science and Technology, Mickiewicza 30 Av., 30-059 Cracow, Poland.
Materials (Basel). 2023 Sep 6;16(18):6094. doi: 10.3390/ma16186094.
In this study, municipal solid waste incineration (MSWI) fly ash was subjected to mineral carbonation with the aim of investigating CO sequestration in waste material. The conducted study follows the trend of searching for alternatives to natural mineral materials with the ability to sequestrate CO. The mineral carbonation of MSWI fly ash allowed for the storage of up to 0.25 mmol CO g. Next, both carbonated and uncarbonated MSWI fly ashes were activated using an alkaline activation method by means of two different activation agents, namely potassium hydroxide and potassium silicate or sodium hydroxide and sodium silicate. Mineral carbonation caused a drop in the compressive strength of alkali-activated materials, probably due to the formation of sodium and/or potassium carbonates. The maximum compressive strength obtained was 3.93 MPa after 28 days for uncarbonated fly ash activated using 8 mol dm KOH and potassium hydroxide (ratio 3:1). The relative ratio of hydroxide:silicate also influenced the mechanical properties of the materials. Both carbonated and uncarbonated fly ashes, as well as their alkali-activated derivatives, were characterized in detail by means of XRD, XRF, and FTIR. Both uncarbonated and carbonated fly ashes were subjected to TG analysis. The obtained results have proved the importance of further research in terms of high-calcium fly ash (HCFA) utilization.
在本研究中，对城市固体废弃物焚烧（MSWI）飞灰进行了矿物碳酸化处理，旨在研究废弃物中的二氧化碳封存情况。所开展的研究顺应了寻找具有二氧化碳封存能力的天然矿物材料替代品的趋势。MSWI飞灰的矿物碳酸化可实现高达0.25 mmol CO₂/g的封存量。接下来，使用两种不同的活化剂，即氢氧化钾和硅酸钾或氢氧化钠和硅酸钠，通过碱性活化方法对碳酸化和未碳酸化的MSWI飞灰进行活化。矿物碳酸化导致碱激活材料的抗压强度下降，这可能是由于碳酸钠和/或碳酸钾的形成。对于使用8 mol dm⁻³ KOH和氢氧化钾（比例3:1）活化的未碳酸化飞灰，28天后获得的最大抗压强度为3.93 MPa。氢氧化物与硅酸盐的相对比例也会影响材料的力学性能。通过XRD、XRF和FTIR对碳酸化和未碳酸化的飞灰及其碱激活衍生物进行了详细表征。对未碳酸化和碳酸化的飞灰都进行了热重分析。所得结果证明了在高钙飞灰（HCFA）利用方面进一步研究的重要性。
