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:
The exploitation of mineral deposits generates large amounts of wastes such as fine size particles,known as tailings. Mine wastes are characterized by the presence of pyrite, pyrrotite, galene,sphalerite, chalcopyrite and arsenopyrite. One of the most important environmental problemsderived from the treatment and disposition of mining tailings is acid mine drainage (AMD) whichresults from the oxidation of the sulfurous minerals contained in these tailings. The acid generatedis produced by a series of complex chemical reactions; the production rate is controlled by leachingmicroorganisms, which are present mining processes. In this work the bioleaching kinetics of heavymetals such as Cu, Fe, Zn, Cd, Pb, Ni and As, from a Tizapa tailing sample in presence ofmesophilic and moderately thermophilic bacteria were studied and compared. The microorganismsused in this work were previously adapted to the tailing sample by the conventional method ofsuccessive steps. The percentage of dissolution of heavy metals at 45°C was smaller than at 35°Cand the value of parameters such as redox potential and bacterial growth increased withtemperature. Bioleaching studies were compared with the corresponding control systems
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/01/39/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.20-21.34.pdf
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