ISSN:
1662-8985
Source:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
Iron oxidizing bacteria Acidithiobacillus ferrooxidans, iron reducing bacteriaAcidiphilium spp. and their mixture were applied for leaching of iron impurities from quartz sand.The bacterial leaching was carried out in order to decrease the amount of colouring iron oxides andto improve the technological properties of the raw material. Mineralogical analysis confirmed thepresence of siderite, iron-bearing muscovite and various amorphous and crystalline forms of ironoxides occurring both free and coating siderite and quartz particles. Mössbauer spectroscopyrevealed various oxidation and magnetic states of iron ions, with the prevalence of reduced ionicspecies. Highest extraction of iron was achieved with pure culture of iron-reducing bacteria withferrous iron as dominant species in the leaching liquor. Surprisingly, iron oxidizing bacteria causedpassivation of the surface of iron-bearing minerals, resulting in the depression of iron leaching incomparison with abiotic control. Ferric iron was major species in the leaching solution containingthe mixed culture of iron-oxidizing and iron-reducing bacteria. The mixture was far less efficient iniron extraction than pure culture of iron-reducing bacteria
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/01/39/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.20-21.130.pdf
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