Biological Purification of Silicate Minerals

Iveta Štyriaková; Michal Lovás

doi:10.4028/www.scientific.net/AMR.20-21.126

Paper Titles

Cobalt and Nickel Recoveries from Laterite Tailings by Organic and Inorganic Bioacids
p.107

Bioleaching of a High Iron Content Kaolin by Aspergillus niger: The Effects of Organic Acids Biosynthesis
p.111

Optimization of Kaolin Bioleaching by Aspergillus niger
p.115

Application of Mesophilic Mixed Micro-Organisms for Recovery of Valuable Metals from Spent Refinery Catalysts
p.119

Biological Purification of Silicate Minerals
p.126

Deferrization of Kaolinic Sand by Iron Oxidizing and Iron Reducing Bacteria
p.130

Sulfur Product Layer in Sphalerite Biooxidation: Evidences for a Mechanism of Formation
p.134

Monitoring of Hydrocarbon Gaseous Compounds formed During Bioleaching of Copper Sulphide Minerals with Mesophilic Microorganisms
p.139

Bioleaching of a Mixed Copper Dust Emanating from Copper Smelters
p.143

HomeAdvanced Materials ResearchAdvanced Materials Research Vols. 20-21Biological Purification of Silicate Minerals

Biological Purification of Silicate Minerals

Abstract:

Bioleaching is technology applicable to iron extraction from low-grade non-metallic raw materials. Bioleaching of quartz sands and feldspars involves the action of heterotrophic bacteria. Impurities include fine – grained limonite, goethite, hematite or mica were removed by the reductive dissolution of Fe3+ in linked with the silicate mineral destruction. Heterotrophic bacteria produced organic acids that are able to solubilize Fe oxide and silicates but require organic carbon as a source of energy. Molasses is a relatively inexpensive carbon source used for various industrial fermentations and contains also other nutrients that accounted for the enhancement of iron dissolution in this study. The admixture of pigments in molasses coloured the samples, but the discoloration could be removed by the addition of NaClO following the bioleaching step. The feasibility of the bioleaching treatment has to be tested specifically to each type of silicate raw materials. 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.

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Periodical:

Advanced Materials Research (Volumes 20-21)

Pages:

126-129

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.20-21.126

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Online since:

July 2007

Authors:

Iveta Štyriaková, Michal Lovás

Keywords:

Bacillus, Bioleaching, Feldspar, Iron, Kaoline, Quartz Sand

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