Abstract
Biotechnological treatment of non-metallics is based on bacterial leaching of raw material and dissolution of Fe. Bacterial iron dissolution ability is dependent on various physicochemical factors as temperature, acidity of solutions, redox potential, rapidity of water circulation and presence of organic sources. The Fe content in the quartz sands and feldspar samples by the biological leaching decreased as much as 60% and by subsequent using of electromagnetic separation of feldspars, the decrease of Fe content in 74% was achieved. However, the application of magnetic separation of quartz sands after bioleaching resulted in total iron removal of 93% and in such combined way prepared product contained 0.024 % of Fe2O3. Achieved results on iron removal point to the fact that combination of leaching and magnetic separation enables to obtain product usable in glass and ceramic industry.
Highlights
Non-metallic raw materials such as silicates, carbonates and oxides contain no energy source for the microorganisms to utilize
The iron-bearing minerals can be removed by magnetic separation, and ultra-fine iron particles are difficult to treat by conventional mineral processing methods, biochemical leaching appears to be the alternative for the effective removal of iron minerals
Heterotrophic bacteria of Bacillus strains are ubiquitous in non-metallic deposit (ŠTYRIAKOVÁ and ŠTYRIAK, 2002), they are non-pathogenic and are facultative anaerobic bacteria enabling an easy manipulation during non-metallic treatment, increased rapidly in the numbers of cell during non-metallic treatment and targently produced organic acid in silicate structures
Summary
Non-metallic raw materials such as silicates, carbonates and oxides contain no energy source for the microorganisms to utilize. Such materials may be leached by using heterotrophic bacteria and fungi, which require an organic carbon source as a source of energy and carbon for their growth. Iron reduction was monitored as a measure of bacterial activity in the bioleaching of non-metallic raw materials. The aim of this was to remit on bacterial kind of Bacillus spp. can be used for bioleaching and the effect of factors on the extent of Fe removal from non-metallics
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