Sustainable Optimization of Lightweight Aggregate Production from Bauxite Residue via Nonlinear Programming.

Larissa Pereira de Siqueira, Hugo Fernando Meiguins da Silva, Mailson Batista de Vilhena, Agenor Sousa Santos Neto, Bruno Marques Viegas, José Antônio da Silva Souza, Emanuel Negrão Macêdo

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Article in ACS omega, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.

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7 authors.

Larissa Pereira de SiqueiraFaculty of Chemical Engineering, Federal University of Pará, Belém 66075-110, Brazil.

Hugo Fernando Meiguins da SilvaFaculty of Chemical Engineering, Federal University of Pará, Belém 66075-110, Brazil.

Mailson Batista de VilhenaDepartment of Production Engineering, State University of Amapá, Macapá 68900-070, Brazil.

Agenor Sousa Santos NetoDepartment of Production Engineering, State University of Amapá, Macapá 68900-070, Brazil.

Bruno Marques ViegasGraduate Program in Biotechnology, Federal University of Pará, Belém 66075-110, Brazil.ORCID https://orcid.org/0000-0002-2768-652X

José Antônio da Silva SouzaGraduate Program in Process Engineering, Federal University of Pará, Belém 66075-110, Brazil.

Emanuel Negrão MacêdoFaculty of Chemical Engineering, Federal University of Pará, Belém 66075-110, Brazil.ORCID https://orcid.org/0000-0002-4652-8316

Funding

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6 · The paper itself

Abstract

In this work, lightweight aggregates were developed from mixtures of bauxite residue and clay, using a nonlinear programming model to determine the optimum composition. The aggregates were characterized using TGA/DTG/DSC analysis, X-ray diffraction, scanning electron microscopy and physical tests of apparent density, porosity and water absorption, carried out on three samples (BR50, BR30.50 and BR0). The results showed that the bauxite residue favored the formation of amorphous and porous phases, reducing the density of the aggregates. A nonlinear programming model was developed to determine the optimal composition of a lightweight aggregate, resulting in a mixture containing 30.50% bauxite residue and 69.50% clay. This composition yielded a material with a density of 0.78 ± 0.03 g/cm

Identifiers

PMID41502686

DOI10.1021/acsomega.5c09834

PMCPMC12771972

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