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  • The quality improvement of non-metallic raw materials by bioleaching [Elektronski vir]
    Štyriakova, Iveta ; Bekéniová, Alexandra ; Štyriaková, Darina
    The process of biological leaching is a simple and effective technology for quality improvement of non-metallics, which is possible to use either as a pretreatment of these raw materials before the ... electromagne-tic separation for the increase of the yield at iron removal, or as an autonomous 1-3 months lasting treatment of non-metallics in the processes of discontinuous static leaching in the water environment. These processes were tested under laboratory conditions, applying the quartz sands from the deposits of Vyšný Petrovec, Šaštín and Plachtince, next the feldspar raw materials from localities of Liešťany, Vydrovo and Rudník, as well as the kaolin from the deposits of Horná Prievrana, Vyšný Petrovec and Rudník. The amount of removed iron was not directly proportional to the initial iron content in the natural samples; it was dependent on the mineralogical composition of the iron minerals and on the binding of Fe with the clays and silicate minerals, as well as on the grain-size of the iron minerals, the bioleaching conditions, and on the addition of chelating substances. The heterotrophic bacteria, growing in the presence of all non-metallic raw materials, were able to dissolve the iron. Quickly forming anaero-bic conditions by bacteria for iron reduction and dissolution enable simple manipulation with the sample solution. Presented simple comparison of laboratory bioleaching experiments for iron decrease applying the heterotrophic bacteria on non-metallics were conducted to explore the best economical way for non-metallic raw materials treatment with the elimination of conventional operations in the industrial scale. The laboratory experiments of the iron removal from the host industrial minerals were verified twice - during the in-situ conditions applying the quartz sand, where the unsterile climatic conditions were taken into consideration. At the in-situ bioleaching of the quartz sands, the changes of medium pH, oxygen and glucose concentration, as well as bioleaching time, were the important factors during iron removal
    Source: Mineralia Slovaca [Elektronski vir]. - ISSN 1338-3523 (49, 2, 2017, str. 177-184)
    Type of material - e-article ; adult, serious
    Publish date - 2017
    Language - english
    COBISS.SI-ID - 46399491

    Link(s):

    https://da.geology.sk/navigator/download.jsp?magazineId=A1001001A18D11B31443A32741

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