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Paper Information

Journal:   IRANIAN JOURNAL OF SCIENCE AND TECHNOLOGY TRANSACTION B- ENGINEERING   2003 , Volume 27 , Number B2; Page(s) 317 To 328.
 
Paper: 

EFFECTS OF INITIAL LEVELS OF THE BACTERIAL POPULATION AND ORE-ADAPTATION OF MIXED CULTURES OF THIOBACILLI AND LEPTOSPIRILLI ON BIOLEACHING OF MOUTEH SULFIDIC GOLD ORE

 
 
Author(s):  VAHABZADEH F.*, BONAKDARPOUR B., TALEBNIA F.
 
* 
 
Abstract: 
The bacterial oxidation of sulfide ores can be exploited in the mining industry to leach and extract heavy metals from metal sulfide deposits. Conventional methods for the extraction of precious metals from such complex sulfidic matrices are highly energy consuming and notorious for environmental pollution problems. Precious metals in the form of grains are very finely distributed and encapsulated in the sulfide matrices and direct cyanidation of the refractory sulfide ores usually gives unsatisfactory recovery of such metals. Bio-oxidation of a gold-bearing pyite concentrate has been considered as an alternative process for the pretreatment of such a refractory ores prior to syndication. In this research, a mixed cultures of "Thiobacillus ferrooxidans" Thioacillus thiooxidans", and "Leptospirillum ferrooxidans" strains of DSM culture collection were examined batchwise for their ability to oxidize iron portion of gold-bearing pyrite concentrate from "Mouteh" mine in Isfahan. Effects of initial levels (i.e ratio of the bacterial cell numbers in the inoculum) and ore adaptation of mixed cultures of the above named bacterial species on bioleaching of the sulfidie pyrite have been studied. Time course of changes in iron concentration was determined. Iron dissolution during bioleaching could be used as an index for release of gold, which has been intergrown in the sulfidic matrix. Mixed cultures of these strains of three bacterial species acted efficiently in leaching iron and the variables indicated above had positive influence on the rate iron dissolution.. In order to characterize kinetics of the bio-oxidation in terms of the logistic equation, the data obtained were fitted to this equation. A linear regression was performed on the data in their logarithmic form and logistic model parameters were calculated. The logistic equation was found to be a good fit to all of the data obtained in this study.
 
Keyword(s): THIOBACILLI, LEPTOSPRILLI, BIOLEACHING, REFRACTORY GOLD ORE, LOGISTIC EQUATION
 
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