. . "Biodestruction and deferritization of quartz sands by Bacillus species." . "5"^^ . "16" . "Kraus, I." . . "599822" . "Biodestruction and deferritization of quartz sands by Bacillus species." . "Biodestruction and deferritization of quartz sands by Bacillus species."@en . . "\u0160tyriak, I." . "0"^^ . "0"^^ . . . . "Biodestruction and deferritization of quartz sands by Bacillus species."@en . "Quartz sand containing mineral impurities was subjected to bioleaching with Bacillus spp. strains and subsequent elutriation. Bioleaching of the sample removed visible Fe-bearing minerals that coated quartz grains. During the bioleaching, elements were dissolved from silicate minerals. Poorly crystalline Fe-oxides that sealed siderite nodules were released from intergranular spaces and formed a fine-grained (<0.1 mm) fraction. Voltammetry of the fine-grained fraction indicated reductive dissolution of Fe3+. However, chemical analysis showed a slight increase in Fe2O3 content and a decrease in the FeO content following three months bioleaching in the Bacillus culture. X-ray diffraction analyses showed the loss of Fe-bearing minerals and mica following the bioleaching and the elutriation of the fine-grained fraction. Transmission electron microscopy and energy-dispersive analysis of X-rays showed nucleation of fine-grained Fe,Al-silicates on bacterial surface after three months of bioleaching." . "3"^^ . . . "GB - Spojen\u00E9 kr\u00E1lovstv\u00ED Velk\u00E9 Brit\u00E1nie a Severn\u00EDho Irska" . . "709;713" . "8" . "Bezdi\u010Dka, Petr" . "Quartz sand containing mineral impurities was subjected to bioleaching with Bacillus spp. strains and subsequent elutriation. Bioleaching of the sample removed visible Fe-bearing minerals that coated quartz grains. During the bioleaching, elements were dissolved from silicate minerals. Poorly crystalline Fe-oxides that sealed siderite nodules were released from intergranular spaces and formed a fine-grained (<0.1 mm) fraction. Voltammetry of the fine-grained fraction indicated reductive dissolution of Fe3+. However, chemical analysis showed a slight increase in Fe2O3 content and a decrease in the FeO content following three months bioleaching in the Bacillus culture. X-ray diffraction analyses showed the loss of Fe-bearing minerals and mica following the bioleaching and the elutriation of the fine-grained fraction. Transmission electron microscopy and energy-dispersive analysis of X-rays showed nucleation of fine-grained Fe,Al-silicates on bacterial surface after three months of bioleaching."@en . . "RIV/61388980:_____/03:50033035" . "RIV/61388980:_____/03:50033035!RIV/2004/AV0/A50004/N" . . . "Z(AV0Z4032918)" . "bacteria; Bacillus spp.; bioleaching"@en . "[32B462C29011]" . . "0892-6875" . "6"^^ . "Minerals Engineering" . "Grygar, Tom\u00E1\u0161" . . "Hradil, David" . "\u0160tyriakov\u00E1, I." . . .