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Bacterial Clay Release and Iron Dissolution During the Quality Improvement of Quartz Sands by Iveta Štyriaková; Igor Štyriak; Pavol Malachovský; Zbyněk Večera; Dávid Koloušek is a Engineering article available to read on EtoBox.

What is Bacterial Clay Release and Iron Dissolution During the Quality Improvement of Quartz Sands about?

Naturally occurring quartz sands contain various iron and clay minerals which coat silicate grains or are impregnated in silicate matrix. Treatment by bioleaching in combination with electromagnetic separation can substantially improve the quality of quartz sands. Bacterial removal of smectite, kaolinite and illite can be used to expose the surfaces of quartz grains. The purpose of this study was to evaluate the feasibility of using a biological treatment process to improve the quality of quartz sands. The experimental conditions involved 10% (w/v) pulp density, pH 7-5, incubation at 24 °C for up to 4 months, and 0.63 mM dissolved Fe. Bioleaching with Bacillus spp. resulted in a 60% decrease in the Fe content of quartz sands from the Šaštín deposit, Slovakia. The subsequent electromagnetic separation decreased the Fe content of the quartz sand from 0.13% to 0.02% Fe 2 O 3 . Analysis of the solution phase and bacterial production of CO 2 were used to monitor the assimilatory reduction of iron during the bioleaching of the quartz sands and to optimize the bioprocessing conditions for the bacterial activity. The rate of iron dissolution varied with the Bacillus species and increased w

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Author

Iveta Štyriaková; Igor Štyriak; Pavol Malachovský; Zbyněk Večera; Dávid Koloušek

Publisher

Elsevier Science; Elsevier ; Elsevier BV (ISSN 0304-386X)

Published

2007

Language

EN

Field

Engineering (Physical Sciences)