Composition and Properties of Bio-Reagent to Intensify Leaching of Nonferrous Metals from Sulfide Ores and Concentrates
L. N. KRYLOVA, V. A. IGNATKINA
National University of Science and Technology-MISIS, Leninskii pr. 4, Moscow, 119049 Russia
Keywords: биореагент, железоокисляющие бактерии, сульфат железа, молекулярный состав, кристаллическая структура железа, фазовый состав, функциональные группы, центрифугирование, окислительная активность, осаждение, bio-reagent, iron-oxidizing bacteria, iron sulfate, molecular composition, iron-crystal structure, phase composition, functional groups, centrifugal separation, oxidative activity, sedimentation
Abstract
New information is obtained on composition and properties of a bio-reagent-oxidizer generated by mesophilic aerobic chemo-tropholytic bacteria Acidithiobaccilus ferrooxidans under oxidation of iron ions (II) in sulfuric acid solution. The composition and properties of the bio-reagent are compared with iron sulfate (III) used to intensify agitation and heap leaching of metals from sulfide ores and concentrates. The research with IR spectroscopy, mass spectrometry, Moessbauer spectrometry and potentiometry has revealed distinctive features of the bio-reagent and explained the experimentally observed increase in its oxidative activity when interacting with mine.
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