Valorization of Aluminum Salt Slag Washed Residue in the Production of Portland Cement Clinker

Valorization of Aluminum Salt Slag Washed Residue in the Production of Portland Cement Clinker

The present research work focuses on the utilization of aluminum salt slag washed residue (SSWR) in Portland cement clinkerization. The initial Al salt slag was ground below 100 µm in order to recover the residual metallic Al. The ground salt slag was subjected to water leaching at various temperatu...

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Bibliographic Details
Published in:Journal of sustainable metallurgy Vol. 8; no. 1; pp. 102 - 111
Main Authors: Piperopoulos, K., Kaldellis, A., Oustadakis, P., Perraki, M., Tsakiridis, P. E.
Format: Journal Article
Language:English
Published: Cham Springer International Publishing 01-03-2022
Springer Nature B.V
Subjects:
Aluminum
Bauxite
Bayer process
Cement
Chemical analysis
Clinker
Compressive strength
Earth and Environmental Science
Environment
Gypsum
Leaching
Metallic Materials
Portland cements
Raw materials
RawMat2021: International Conference on Raw Materials and Circular Economy
Residues
Slag
Sustainable Development
Thematic Section: RawMat2021: International Conference on Raw Materials and Circular Economy
X-ray diffraction
Characterization
Clinker
Treatment
Al salt slag
Hydration
Cement
Raw meal
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Summary:The present research work focuses on the utilization of aluminum salt slag washed residue (SSWR) in Portland cement clinkerization. The initial Al salt slag was ground below 100 µm in order to recover the residual metallic Al. The ground salt slag was subjected to water leaching at various temperatures for the removal of soluble salts (NaCl, KCl). During the process of washing, about half of the nitrides were also decomposed. Different amounts of the washed residue were introduced in the raw meal before sintering at 1400 °C, fully replacing bauxite from the raw meal (4.5 %wt). The produced clinkers have been characterized by means of chemical analysis, X-ray diffraction (XRD), and scanning electron microscopy (SEM). After co-grinding with suitable amount of gypsum, the produced cements were evaluated by determining setting times, standard consistency, expansibility, and compressive strength at 2, 7, and 28 days. XRD analyses were used in order to determine the hydration evolution. Salt slag washed residue presents a promising alternative in waste valorization practice, as it can readily be used in the raw kiln feed as a partial replacement of ordinary raw materials. Graphical Abstract
ISSN:2199-3823
2199-3831
DOI:10.1007/s40831-022-00504-0