Enhanced Coal Fly Ash Desilication Using Atmospheric NaOH Leaching with Simultaneous Magnetic Separation
Электронный научный архив УРФУ
Информация об архиве | Просмотр оригинала| Поле | Значение | |
| Заглавие |
Enhanced Coal Fly Ash Desilication Using Atmospheric NaOH Leaching with Simultaneous Magnetic Separation
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| Автор |
Shoppert, A.
Valeev, D. Loginova, I. Chaikin, L. Pan, J. |
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| Тематика |
ALKALINE LEACHING
COAL FLY ASH DESILICATION IRON EXTRACTION KINETICS WASTE UTILIZATION |
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| Описание |
Coal fly ash (CFA) is a technogenic waste formed during coal combustion in thermal power plants (TPPs). The extraction of valuable components from CFA is complicated by the presence of a large amount of amorphous glassy mass and iron. Herein, a novel method of CFA desilication with complete extraction of the amorphous glassy mass without desilication product (DSP) precipitation and simultaneous magnetic fraction recovery in one stage is presented. The Fe recovery in the magnetic fraction using the proposed method was significantly improved from 52% to 68%. After conventional wet magnetic separation, followed by the proposed method for desilication and magnetic fraction separation, the Fe recovery was increased to 73.8%. Because of the absence of DSP precipitation, the Na2O content in the solid residue after desilication was lower than 1 wt.%. The simultaneous desilication and magnetic separation of magnetite was achieved by installing a belt of permanent magnets on the outer surface of the reactor, where the CFA was leached by the highly concentrated NaOH solution. The effects of different parameters on the extraction of Si, Al, and Fe from the raw CFA were elucidated by varying the liquid-to-solid ratio (L:S ratio) from 5 to 10, the temperature from 100 to 120 °C, the leaching time from 10 to 30 min, and the particle size from −50 µm to −73 µm. The optimal leaching parameters were determined to be temperature = 110 °C, L:S ratio = 7.5, and leaching time = 20 min. The extraction of Si and Fe under these conditions was higher than 66 and 73%, respectively. The Al extraction was lower than 10%. The solid residue of NaOH leaching and the magnetic fraction were examined by X-ray diffraction, X-ray fluorescence spectrometry, vibrating sample magnetometry, scanning electron microscopy with energy-dispersive X-ray spectroscopy, Brunauer–Emmett–Teller, and laser diffraction analyses. © 2023 by the authors.
Russian Science Foundation, RSF: 22-23-20150 This research was supported by the Russian Science Foundation and Government of Sverdlovsk region, Joint Grant No. 22-23-20150. |
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| Дата |
2024-04-05T16:34:50Z
2024-04-05T16:34:50Z 2023 |
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| Тип |
Article
Journal article (info:eu-repo/semantics/article) |info:eu-repo/semantics/publishedVersion |
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| Идентификатор |
Shoppert, A, Valeev, D, Loginova, I, Chaikin, L & Pan, J 2023, 'Enhanced Coal Fly Ash Desilication Using Atmospheric NaOH Leaching with Simultaneous Magnetic Separation', Metals, Том. 13, № 10, 1647. https://doi.org/10.3390/met13101647
Shoppert, A., Valeev, D., Loginova, I., Chaikin, L., & Pan, J. (2023). Enhanced Coal Fly Ash Desilication Using Atmospheric NaOH Leaching with Simultaneous Magnetic Separation. Metals, 13(10), [1647]. https://doi.org/10.3390/met13101647 2075-4701 Final All Open Access, Gold https://www.scopus.com/inward/record.uri?eid=2-s2.0-85174891940&doi=10.3390%2fmet13101647&partnerID=40&md5=9d5ce6b530a6c39e9244f14a1ebb8964 https://www.mdpi.com/2075-4701/13/10/1647/pdf?version=1695656512 http://elar.urfu.ru/handle/10995/130878 10.3390/met13101647 85174891940 001089535700001 |
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| Язык |
en
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| Связанные ресурсы |
info:eu-repo/grantAgreement/RSF//22-23-20150
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| Права |
Open access (info:eu-repo/semantics/openAccess)
cc-by https://creativecommons.org/licenses/by/4.0/ |
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| Формат |
application/pdf
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| Издатель |
Multidisciplinary Digital Publishing Institute (MDPI)
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| Источник |
Metals
Metals |
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