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Maximize the use of municipal waste generated by the hydrogen peroxide industry in the production of high-quality refractory CAC

High-grade calcium aluminate cement (CAC) has been successfully synthesized from municipal alumina waste and limestone under mild reaction conditions. Mineralogical composition and microstructure of the sintered mixes were investigated using X-ray diffraction and FESEM; valuable cementing phases suc...

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Autores principales: Amer, Ahmed I. H., El-Maddah, A. A., Abuelela, Ahmed M., Ahmed, Y. M. Z., Hassan, Ali M., El-Amir, Ahmed A. M.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group UK 2022
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9329347/
https://www.ncbi.nlm.nih.gov/pubmed/35896577
http://dx.doi.org/10.1038/s41598-022-16891-z
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author Amer, Ahmed I. H.
El-Maddah, A. A.
Abuelela, Ahmed M.
Ahmed, Y. M. Z.
Hassan, Ali M.
El-Amir, Ahmed A. M.
author_facet Amer, Ahmed I. H.
El-Maddah, A. A.
Abuelela, Ahmed M.
Ahmed, Y. M. Z.
Hassan, Ali M.
El-Amir, Ahmed A. M.
author_sort Amer, Ahmed I. H.
collection PubMed
description High-grade calcium aluminate cement (CAC) has been successfully synthesized from municipal alumina waste and limestone under mild reaction conditions. Mineralogical composition and microstructure of the sintered mixes were investigated using X-ray diffraction and FESEM; valuable cementing phases such as CA, CA(2), and C(12)A(7) were observed in addition to the C(3)A phase that was detected in the mixes with high CaCO(3) content. Mix CA60 containing 60 wt% alumina waste has achieved the best sinterability (less than 1 vol% porosity) and the highest densification (~ 2.65 g/cm(3) bulk density) at 1450 °C. Densification, cold-crushing strength (CCS), and microstructure of the hydrated cement samples (From Mix CA60) were investigated. The cast cement specimens revealed better density and CCS characteristics (63.1 and 74 MPa at 7 and 28 days, respectively) in comparison with the commercial cement. Conventional castables (5 × 5 × 5 cm(3)) were prepared from mixtures composed of 15 wt% cement and 85 wt% aggregates (40% Al(2)O(3)), where CA60 and commercial cement were used to compare the effect of the manufactured CA60 cement with the commercial one. The castables prepared with CA60 cement have shown a higher strength at 110 °C with 4.5 MPa when compared to the commercial CAC at the same temperature (1.8 MPa). Accordingly, this study contributes not only to preserving the environment from the accumulation of industrial wastes but also to valorizing and adding value to these wastes.
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spelling pubmed-93293472022-07-29 Maximize the use of municipal waste generated by the hydrogen peroxide industry in the production of high-quality refractory CAC Amer, Ahmed I. H. El-Maddah, A. A. Abuelela, Ahmed M. Ahmed, Y. M. Z. Hassan, Ali M. El-Amir, Ahmed A. M. Sci Rep Article High-grade calcium aluminate cement (CAC) has been successfully synthesized from municipal alumina waste and limestone under mild reaction conditions. Mineralogical composition and microstructure of the sintered mixes were investigated using X-ray diffraction and FESEM; valuable cementing phases such as CA, CA(2), and C(12)A(7) were observed in addition to the C(3)A phase that was detected in the mixes with high CaCO(3) content. Mix CA60 containing 60 wt% alumina waste has achieved the best sinterability (less than 1 vol% porosity) and the highest densification (~ 2.65 g/cm(3) bulk density) at 1450 °C. Densification, cold-crushing strength (CCS), and microstructure of the hydrated cement samples (From Mix CA60) were investigated. The cast cement specimens revealed better density and CCS characteristics (63.1 and 74 MPa at 7 and 28 days, respectively) in comparison with the commercial cement. Conventional castables (5 × 5 × 5 cm(3)) were prepared from mixtures composed of 15 wt% cement and 85 wt% aggregates (40% Al(2)O(3)), where CA60 and commercial cement were used to compare the effect of the manufactured CA60 cement with the commercial one. The castables prepared with CA60 cement have shown a higher strength at 110 °C with 4.5 MPa when compared to the commercial CAC at the same temperature (1.8 MPa). Accordingly, this study contributes not only to preserving the environment from the accumulation of industrial wastes but also to valorizing and adding value to these wastes. Nature Publishing Group UK 2022-07-27 /pmc/articles/PMC9329347/ /pubmed/35896577 http://dx.doi.org/10.1038/s41598-022-16891-z Text en © The Author(s) 2022 https://creativecommons.org/licenses/by/4.0/Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/ (https://creativecommons.org/licenses/by/4.0/) .
spellingShingle Article
Amer, Ahmed I. H.
El-Maddah, A. A.
Abuelela, Ahmed M.
Ahmed, Y. M. Z.
Hassan, Ali M.
El-Amir, Ahmed A. M.
Maximize the use of municipal waste generated by the hydrogen peroxide industry in the production of high-quality refractory CAC
title Maximize the use of municipal waste generated by the hydrogen peroxide industry in the production of high-quality refractory CAC
title_full Maximize the use of municipal waste generated by the hydrogen peroxide industry in the production of high-quality refractory CAC
title_fullStr Maximize the use of municipal waste generated by the hydrogen peroxide industry in the production of high-quality refractory CAC
title_full_unstemmed Maximize the use of municipal waste generated by the hydrogen peroxide industry in the production of high-quality refractory CAC
title_short Maximize the use of municipal waste generated by the hydrogen peroxide industry in the production of high-quality refractory CAC
title_sort maximize the use of municipal waste generated by the hydrogen peroxide industry in the production of high-quality refractory cac
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9329347/
https://www.ncbi.nlm.nih.gov/pubmed/35896577
http://dx.doi.org/10.1038/s41598-022-16891-z
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