Vliv zrnitosti při získávání kovů bakteriálním loužením ze sedimentu z lokality Zlaté Hory

Abstract

This diploma thesis deals with the influence of different particle sizes on the recovery of iron, lead, copper and zinc by bioleaching. The sludge sediment sample from the Golden Mountain area was tested and the acidophilic and mesophilic Acidithiobacillus ferrooxidans bacteria were used. The experiments were carried out in Erlenmeyer flasks at a constant temperature of 30 °C, agitation rates of 100 rpm and pH 2. The grain size fractions <40 µm, 40-71 µm, 71-100 µm and 100-200 µm were investigated. The results show that the highest iron (76,48 %), copper (82,01 %) and lead (88,90 %) recoveries were obtained at particle size of 71-100 µm. Zinc was dissolved for all fractions above 90 %. Tests of different sample weights were performed in a Bioflo & CelliGen 310 bioreactor, which maintained a constant pH of 2, a temperature of 30 °C and a stirring speed of 150 rpm. The higher sample density caused a negative effect on the percent dissolution of the metals.