Abstract
The synthesis of zeolites using waste as a source of Si and Al is well known, and light coal ash has been studied to minimize the problems of waste management and mitigate environmental effects. The residue used in this work was supplied by Coal Workers Assistance Society (SATC) Criciúma–SC/Brazil, and had 24.09% Al2O3 and 54.25% SiO2 in its chemical composition. Synthesis studies using this residue with the objective of obtaining LTA zeolites were carried out by hydrothermal means, alkaline fusion, and the combination of the two methods, varying parameters such as crystallization time, Na/T ratio, OH/ratio, ultrasound exposure, gel agitation temperature, and the alkaline melting temperature of the residue. The results were characterized by X-ray diffraction (XRD) techniques and scanning electron microscopy (SEM-FEG). It was possible to obtain 70% crystalline zeolite type LTA for the first time at mild conditions with temperatures below 200 °C by alkaline fusion with smaller amounts of NaOH and short times (2 h). Thus, suitable parameters were determined for future scaling.
Highlights
Coal ash is generated by the combustion of coal in thermoelectric power plants as a waste product.Given the increasing use of mineral coal, there is a need to minimize the impact it causes
The present study aims to investigate some new parameters of the synthesis of LTA-type zeolites using light coal ash, aiming for a future industrial application of this synthesis
The synthesis of LTA-type zeolites using coal fly ash (CF) was carried out using the route proposed by Bieseki et al [21]
Summary
Coal ash is generated by the combustion of coal in thermoelectric power plants as a waste product.Given the increasing use of mineral coal, there is a need to minimize the impact it causes. Coal ash is generated by the combustion of coal in thermoelectric power plants as a waste product. The amount of coal ash produced in the world is approximately 500 million tons per year [1]. According to Sabedot et al (2015) [1], burning this fuel produces ashes that are classified as slag, bottom ash (heavy), and fly ash (light). Slag and bottom ash are particles of varying dimensions, usually coarse, that accumulate in temporary deposits in companies that burn coal; light ash, or fly ash, is made up of particles smaller than 0.15 nm and is carried away by combustion gases [2]. The largest amount of waste generated from this burning is fly ash (84% of the total coal ash) [1,3].
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
