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Coal fly ash is one of the industrial by-products that is produced from coal combustion. A large amount of coal fly ash is currently dumped at a landfill, while the current utilization of coal fly ash has been limited to the raw material of soil amendment production and cement concrete. Coal fly ash can be potentially utilized to be the raw …
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Fly ash obtained from a power generation plant was used for synthesizing zeolite. Zeolites could be readily synthesized from the glassy combustion residues and showed potential for the removal of heavy metal ions. By the use of different temperatures and NaOH concentration, five different zeolites were obtained: Na-P1, faujasite, hydroxy sodalite, …
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@article{Boycheva2020ConversionOC, title={Conversion of coal fly ash into nanozeolite Na-X by applying ultrasound assisted hydrothermal and fusion-hydrothermal alkaline activation}, author={Silviya Boycheva and Ivan Marinov and Simona Miteva and Denitza Zgureva}, journal={Sustainable Chemistry and Pharmacy}, year={2020}, …
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In this research, we converted high silicon fly ash to a high ion-exchange capacity zeolite using a two stages conversion process. Alkaline fusion was applied to collapse the fly ash crystalline phases and release Si content. Then Si/Al ratio of the synthesis sol adjusted with appropriate amount of industrial grade materials.
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Abstract. Mesoporous aluminosilicate in the hexagonal phase (MCM-41) has been synthesized from fused fly ash solutions and cationic cetyltrimethylammonium …
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In this paper, we report our results on converting fly ash into mesoporous molecular sieves. Due to their uniform molecular pore sizes and large surface areas, the …
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The conversion technology of fly ash into zeolites. Original Paper. Open access. Published: 31 January 2014. Volume 16, pages 1217–1223, ( 2014 ) Cite this …
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It is removed by dust collectors from the exhaust gases in the power plants. When fly ash is mixed with the residual coal ash (bottom ash) that does not rise, coal ash is obtained. Coal fly ash (CFA) is a mixture of about 80% fly ash and 20% bottom ash [4]. It a fine grained powder and it is mainly composed of spherical glassy particle (about 80%).
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Abstract. Solid-state conversion of fly ash to an amorphous aluminosilicate adsorbent (geopolymer) has been investigated under different conditions and the …
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Washing with water can remove the soluble salts from fly ash, and the fly ash can be converted into Friedel's salt (3CaO·Al 2 O 3 ·CaCl 2 ·10H 2 O) under an uniform electric field and the sacial release of Al +3 ions, which stabilizes the toxic heavy metals and brings the composition of the fly ash to within the regulatory limits of the ...
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Mesoporous aluminosilicate in the hexagonal phase (MCM-41) has been synthesized from fused fly ash solutions and cationic cetyltrimethylammonium bromide (CTAB) surfactants. The authors provide direct evidence that an MCM-41 aluminosilicate with a homogeneous chemical composition of Si/Al = 13.4 can be prepared with cationic …
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A general method of converting various coal ashes into zeolites was investigated. Fly ashes from several utility power plants were fused with sodium hydroxide at 550 °C followed by dissolution in water and hydrothermal treatment. It was found that the solutions of fused powders can be cured at 60 °C under ambient pressure to precipitate …
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This paper presents a sub-pilot scale process of synthesis of Na-P1 zeolite from the coal fly ash. After establishing the appropriate synthesis conditions (20 kg of fly ash, 12 kg of NaOH, 90 dm3 of water, the reaction temperature: 80 °C and reaction time: 36 h), the high-purity (81 wt%) Na-P1 zeolite product was obtained. Its chemical, …
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The fly ash-based zeolite ZSM-5 sample synthesised from the solid residue after extraction of Al and Fe, contained 62% of ZSM-5 zeolite pure phase with a number of Brønsted acid site density of 0 ...
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A general method for the conversion of fly ash into zeolites as ion exchangers for cesium. Hsiao-Lan Chang, W. Shih. Published 5 January 1998. …
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@article{osti_599771, title = {A general method for the conversion of fly ash into zeolites as ion exchangers for cesium}, author = {Chang, H L and Shih, W H}, abstractNote = {A general method of converting various coal ashes into zeolites was investigated. Fly ashes from several utility power plants were fused with sodium …
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Progress in the Utilization of Coal Fly Ash by Conversion to Zeolites with Green Energy Applications. by. Silviya Boycheva. 1,*, Denitza Zgureva. 2, Katerina Lazarova. 3, Tsvetanka Babeva. 3,*, Cyril Popov. 4, …
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The maximum conversion rate as well as gasoline selectivity was found for alkali-activated fly ash catalysts because of its higher specific surface area and total pore volume . To commercialize catalytic pyrolysis technology of waste plastics using modified fly ash should be inspired, because it can save our environment from two solid wastes ...
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This similarity of fly ash to some of volcanic minerals stimulated the idea of using fly ash solid wastes for conversion into the value added synthetic zeolites [9]. Since the results of preliminary studies on this issue were promising, more researchers have been dedicated their research life on this issue. As results of these activities, many ...
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The conversion of MSWI fly ash into a new solid phase, primarily composed of ettringite, exhibits excellent solidification effects on excessive heavy metal Pb. To investigate the solidification mechanism of ettringite on Pb, as well as to comprehend the state of Pb in the ettringite structure at the atomic scale, DFT calculations were …
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The ρs value is similar to the density of fly ash from fluidized bed furnaces, which is 2.46−2.56 Mg m -3 [28]. For SSA and sand mix average value of ρs equaled 2.62 Mg m -3 . ...
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Fly ash with a Si : Al ratio of 3.63 has been converted to a zeolite of high Cu2+ sorption capacity using a fusion conversion process and an improved hydrothermal method. Alkali fusion was applied to …
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The crystallinity was confirmed by surface area electron diffraction. Apart from that, chemical and diffraction analyses for both rice straw ash and synthesized silica nanoparticles were conducted by X-ray diffraction and Fourier-transform infrared spectroscopy. The percentage of silica from the incinerated straw was calculated to be …
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Coal fly ash-derived monominerals on a large scale can significantly contribute to the sustainability goals and efficient waste management. Particle size distribution of ANA and HIC-ANA samples.
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Abstract. Solid-state conversion of fly ash to an amorphous aluminosilicate adsorbent (geopolymer) has been investigated under different conditions and the synthesised material has been tested for Cu2+ removal from aqueous solution. It has been found that higher reaction temperature and Na:FA ratio will make the adsorbents …
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Na-A and -X zeolites were synthesized from waste solutions in conversion of coal fly ash (Fa) to zeolite. The amorphous SiO2 and Al2O3 of Fa were completely dissolved to form Po, Pt, and Pc type ...
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The by-product of coal combustion, coal fly ash (CFA), has become one of the world's most emitted solid wastes, and bulk utilization while achieving high value-added products is the focus of current research. Using CFA to prepare zeolite cannot only reduce environmental pressure, but also obtain high value-added products, which has a good …
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T1 - Conversion of fly ash into mesoporous aluminosilicate. AU - Chang, Hsiao Lan. AU - Chun, Chang Min. AU - Aksay, Ilhan A. AU - Shih, Wei Heng. PY - 1999. Y1 - 1999. N2 - Mesoporous aluminosilicate in the hexagonal phase (MCM-41) has been synthesized from fused fly ash solutions and cationic cetyltrimethylammonium bromide (CTAB) surfactants ...
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It is known that alternative means for stabilizing the CAC conversion are conducted by introducing fly ash (FA) in CAC, where its microstructure is attributed to aluminosilicates. ... Chinnapat Panwisawas, Pitcha Jongvivatsakul, Withit Pansuk, and Lapyote Prasittisopin. 2023. "Effects of Fly Ash Composition to Mitigate Conversion of …
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The conversion process of fly ash into zeolites takes place in the reaction tank which is the main component of the described line. The total volume of the tank is 130 dm 3 (working volume is 100 dm 3). The tank is equipped with a system of three heaters (2 kW each), a probe for controlling the reaction temperature, and the level of tank ...
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