Modeling of the Bioleaching of Process Silver Pulp

Abstract

Modeling of the bioleaching process applied to the system silver‐manganese (Ag‐Mn) was carried out. The two‐moving‐fronts model was used to describe the main stages of the process. Bioleaching involves a catalytic process carried out by bacteria to dissolve the mineral ores. Initially, the bacteria interact with the mineral to dissolve manganese, leading to the precipitation of silver. The Ag‐Mn compound is dissolved by the bacteria in two stages. First, the bacteria dissolve the manganese and form a biofilm composed mostly of exopolysaccharides. In the second stage, the biofilm is consumed by the bacteria, ending up in dissolved manganese and silver precipitation. At 48 h, the viscosity of the pulp reaches a maximum attributed to the maximum concentration of extracellular polysaccharides in the medium. Predictions describe the basic issues of the bioleaching process in this system.

Roles and Regulation of Quorum Sensing of Acidophiles in Bioleaching: A Review

“…By coordinating the attachment and detachment of cells, QS enables microbial communities to collectively attach to mineral surfaces, forming biofilms that can protect microorganisms from extreme environmental conditions [ 88 , 89 ]. Zhang et al proposed a model for the biofilm formation of bacterial strains in bioleaching [ 90 , 91 , 92 ]: Firstly, the cells reversibly attach to the mineral surface while producing adherent EPS compounds [ 93 , 94 ]. Secondly, the cells are firmly attached to the pyrite surface and colonize it; small microcolonies can also be interconnected by EPS or cellular appendages [ 90 , 95 ].…”