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Title: Medium optimization for bioleaching of metals from Indian bulk polymetallic concentrate
Authors: Tipre, D R
Vora, S B
Dave, S R
Keywords: bioleaching
polymetallic concentrate
Cu
Zn
Thiobacillus ferrooxidans
factorial
Issue Date: Jan-2004
Publisher: CSIR
Abstract:  Extensive bioleaching work is mainly done only for the Cu and gold extraction from concentrates. Bioleaching of bulk concentrate is at the developing stage. The present work deals with the formulation of an economic medium for the bioextraction of metals from GMDC polymetallic bulk concentrate. For the medium formulation, a 24 factorial statistically designed experiment was adapted. Effect of concentration at two levels each of K2HPO4, (NH4)2SO4, KCl and inoculum was studied. For Cu and Zn extraction, inoculum was the most significant factor with the nutrients checked. KCl and its interaction were found negatively significant. The formulated medium was compared with the 9K- and Jordan's medium. The highest Cu (77.8%) and Zn (84%) extraction achieved with the formulated medium was 1.25 and 1.32 folds higher than the universally used 9K- medium. The final metal extraction rates obtained were 0.65 and 4.2 g/l/d for Cu and Zn respectively with the designed medium. The composed medium was at least 4 times cheaper, less acid consuming and more suitable for the metal extraction from GMDC polymetallic concentrate compared to 9K- medium.
Page(s): 86-91
ISSN: 0975-0967 (Online); 0972-5849 (Print)
Source:IJBT Vol.03(1) [January 2004]

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