Open Access
Journal of Cleaner Production, volume 218, pages 192-201
Complex utilisation of ekibastuz brown coal fly ash: Iron & carbon separation and aluminum extraction
Valeev Dmitry
1
,
Kunilova I
2
,
Alpatov A
3
,
Mikhailova A.
4
,
Goldberg M. A.
5
,
Kondratiev Alex
6
Publication type: Journal Article
Publication date: 2019-05-01
Journal:
Journal of Cleaner Production
Quartile SCImago
Q1
Quartile WOS
Q1
Impact factor: 11.1
ISSN: 09596526, 18791786
Industrial and Manufacturing Engineering
Renewable Energy, Sustainability and the Environment
General Environmental Science
Strategy and Management
Abstract
Fly ash landfills that accumulate a by-product of coal combustion and gasification represent a permanent threat to the surrounding environment due to many factors (air and water pollution, soil contamination, wildlife poisoning, etc). Moreover, disposed coal fly ash may contain significant amounts of valuable elements that are not extracted and potentially wasted. To improve the above situation, a combined ash treatment process was developed for utilisation of the coal fly ash waste from coal-fired power stations. The ash treatment includes three stages: 1) magnetic separation of an iron-containing fraction, 2) carbon separation by floatation, and 3) extraction of aluminum by the autoclave hydrochloric acid leaching. The lab-scale results of the ash treatment applied to the Ekibastuz brown coal fly ash from the Omsk power stations (Russia) were presented and discussed. The XRD analysis showed that the fly ash consists primarily of quartz, mullite and magnetite. It was found that the magnetic fraction separated at the first stage is enriched in magnetite (over 20 wt %), the carbon content in the concentrate after flotation increases to 27 wt %, and 90–95% of aluminum can be extracted during the autoclave acid leaching. The SEM analysis showed that the magnetite phase is grown on the surface of alumosilicate spheres as ∼1 μm cubic crystals. The effect of the autoclave temperature and exposure time on the Al extraction efficiency was also investigated and analysed in the present paper. The optimal autoclave temperature and exposure time were found to achieve the maximum Al extraction efficiency. It was also found by the SEM microanalysis that further extraction of aluminum is not economically feasible since the remaining Al is evenly surrounded by SiO2 in the fly ash particles.
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- We do not take into account publications that without a DOI.
- Statistics recalculated only for publications connected to researchers, organizations and labs registered on the platform.
- Statistics recalculated weekly.
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Valeev D. et al. Complex utilisation of ekibastuz brown coal fly ash: Iron & carbon separation and aluminum extraction // Journal of Cleaner Production. 2019. Vol. 218. pp. 192-201.
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Valeev D., Kunilova I., Alpatov A., Mikhailova A., Goldberg M. A., Kondratiev A. Complex utilisation of ekibastuz brown coal fly ash: Iron & carbon separation and aluminum extraction // Journal of Cleaner Production. 2019. Vol. 218. pp. 192-201.
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TY - JOUR
DO - 10.1016/j.jclepro.2019.01.342
UR - https://doi.org/10.1016%2Fj.jclepro.2019.01.342
TI - Complex utilisation of ekibastuz brown coal fly ash: Iron & carbon separation and aluminum extraction
T2 - Journal of Cleaner Production
AU - Valeev, Dmitry
AU - Kunilova, I
AU - Alpatov, A
AU - Mikhailova, A.
AU - Goldberg, M. A.
AU - Kondratiev, Alex
PY - 2019
DA - 2019/05/01 00:00:00
PB - Elsevier
SP - 192-201
VL - 218
SN - 0959-6526
SN - 1879-1786
ER -
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@article{2019_Valeev,
author = {Dmitry Valeev and I Kunilova and A Alpatov and A. Mikhailova and M. A. Goldberg and Alex Kondratiev},
title = {Complex utilisation of ekibastuz brown coal fly ash: Iron & carbon separation and aluminum extraction},
journal = {Journal of Cleaner Production},
year = {2019},
volume = {218},
publisher = {Elsevier},
month = {may},
url = {https://doi.org/10.1016%2Fj.jclepro.2019.01.342},
pages = {192--201},
doi = {10.1016/j.jclepro.2019.01.342}
}
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