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:
Both, the employment of leaching bacteria for metal winning as well as the mitigation ofbioleaching processes at AMD/ARD sites, require reliable monitoring methods for assessingbacterial activities. Therefore, we have developed a robust and rapid test system combining twosensitive analytical techniques: quantification of heat evolution by microcalorimetry anddetermination of all relevant inorganic sulfur species by chromatographic methods (IC and HPLC).Generally, only about 1 g of sample is sufficient for a complete analysis. The combined test hasbeen applied to various leaching biotopes such as bioreactors, columns, heaps and natural sites. Thebacterial activity of diverse sulfidic materials such as lignite and coal wastes, pure metal sulfidesand complex ores has been investigated. In our labs, microcalorimetry can be performed in therange of 5 to 80 °C, covering most of the temperature spectrum of leaching bacteria. Hence, theheat evolution values of samples as a direct measure for calculating leaching rates can be obtainedat nearly all relevant in situ temperatures. The combination with sulfur species determination resultsin additional information on leaching mechanisms (thiosulfate or polysulfide pathway) and generalleaching performance (e. g. accumulation of sulfur intermediates)
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/01/39/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.20-21.171.pdf
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