Rheology and Hydrodynamics of Iron Ore Mineral Pulps during a Bioleaching Process in a Continuous Stirred‐Tank Reactor. Issue 4 (2nd January 2023)

• Record Type: Journal Article
• Authors: Ramírez-Torres, Luis Antonio; Medina-Torres, Luis; Calderas, Fausto; Núñez-Ramírez, Diola Marina; Manero, Octavio
• Is Part Of: Chemical engineering & technology. Volume 46:Issue 4(2023)
• Page Start: 670
• Page End: 680
• Publication Date: 2023-01-02
• Subjects: Bioleaching -- Bioreactors -- Fluid mixing -- Mineral pulps rheology -- Non‐Newtonian fluids; Chemical engineering -- Periodicals; Chemical processes -- Periodicals; 660.05
• DOI: 10.1002/ceat.202200438
• Languages: English
• ISSNs: 0930-7516

Abstract

Abstract: The rheological response and the computational hydrodynamic continuous stirred‐tank behavior were analyzed to increase the understanding of the bioleaching process in mineral pulps. The rheological properties of the mineral pulps showed that a smaller particle size increases the magnitude of the rheological parameters, shortens the bioleaching process time, and, indirectly, increases the concentration of bacteria in the medium, thus augmenting the gel strength. The bioreactor hydrodynamics results revealed that the best dual‐impeller configuration corresponds to a Rushton (top)/Maxflo (bottom) configuration, generating power savings of ∼9 %. Finally, when analyzing apparent viscosity maps, velocity fields, and streamlines at different stirring speeds, enhanced hydrodynamic conditions were observed at 400 rpm. Abstract : A bioleaching process with two different particle sizes in a stirred‐tank reactor was rheologically characterized and hydrodynamically enhanced. The rheological tests suggest that smaller particles generate a greater response in a shorter bioleaching time. Hydrodynamic analysis revealed that a dual impeller configuration of Rushton over Maxflo at 400 rpm generates the optimal mixing properties.