Aislamiento y adaptación de microorganismos acidófilos nativos del yacimiento minero San Vicente ubicado en la provincia de Zamora Chinchipe para su aplicación en la biooxidación

Abstract

An alternative pretreatment for gold recovery is the biooxidation. Why the objective of this research was to isolate native acidofile natural acid drainage and try to adapt a refractory ore characteristics. During isolation and adaptation of microorganisms bioassays were conducted at different pH (3.4 and 1.8) and temperature (20 and 30 ° C).The consortium was isolated previously used in the bio-oxidation process, it is carried out on a batch system; remained constant: speed of agitation (400rpm), rotor height (3.5 cm), temperature (20 ° C), air flow (3vvm), pH (1.8) ore size (-200 mesh), while evaluated the effect of pulp density (5, 10, 15 and 20% w/v). In isolation and biooxidation process to determine the concentration of Fe2+; Total Fe, sulfates and bacterial counts. The results showed that the insulation optimal growth conditions were pH 1.8 and 20 ° C, with a maximum increase of 3.5(10)7 #bac/mL. Furthermore, in the system for batch volumetric productivities of Qp Fe3+ of 2.20, 1.65, 0.80, 0.78 g/L day, Qp SO4 2- 3.17, 2.27, 2.10, 1.73 g/L day and a gold recovery of 51 it was obtained , 40, 33, 43% pulp densities of 5, 10, 15 and 20% (w/v), respectively.