Remediation of the alkalinity of steel mill powders by sequential washing with organic acids

• Autores: Delvasto, Pedro, Huang, Xinyan, Sandoval Ravotti, Daniela, Casal-Ramos, Julio Andrés, Domínguez Verenzuela, José Ramón
• Formato: artículo
• Fecha de Publicación: 2011
• Institución: Universidad Nacional Mayor de San Marcos
• Repositorio: Revista UNMSM - IIGEO
• Lenguaje: español
• OAI Identifier: oai:ojs.csi.unmsm:article/688
• Enlace del recurso: https://revistasinvestigacion.unmsm.edu.pe/index.php/iigeo/article/view/688
• Nivel de acceso: acceso abierto
• Materia: Residual alkalinity remediation; residual dust of steel; sequential washed; organic acids; Remediación de la alcalinidad de residuos; polvos residuales de acería; lavado secuencial; ácidos orgánicos

Residual steelmaking powders, coming from a Venezuelan steel mill, were characterized physicochemically, detecting that they had high contents of heavy metals such as Fe, Zn and Pb and a high pH of contact, greater than 12 units, which makes it a waste dangerous due to its tendency to generate leachates with high alkalinity. Due to these results, a remediation process of the residue was proposed through sequential washes with dilute solutions of (CH2) 2COH (COOH) 3 (citric acid), (COOH) 2 (oxalic acid), CH3COOH (acetic acid) and H2SO4 ( sulfuric acid). It was obtained that the CH3COOH solution generated the greatest attenuation of the alkalinity of the powders, reaching acidity until a pH of around 4 units.