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Mineralogy, Geochemistry and Stable Isotope Studies of the Dopolan Bauxite Deposit, Zagros Mountain, Iran

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Department of Earth Sciences, Shiraz University, Shiraz 7146713565, Iran
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Department of Geology, Earth Sciences Faculty, Shahid Chamran University, Ahvaz 6135743136, Iran
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College of Science, Technology and Engineering, Centre for Environmental and Sustainability Science, James Cook University, PO Box 6811, Cairns, Queensland 4870, Australia
4
Department of Geology, Faculty of Sciences, Brandon University, Brandon, MB R7A 6A9, Canada
*
Author to whom correspondence should be addressed.
Academic Editor: Maria Economou-Eliopoulos
Minerals 2016, 6(1), 11; https://doi.org/10.3390/min6010011
Received: 10 November 2015 / Accepted: 28 January 2016 / Published: 6 February 2016
(This article belongs to the Special Issue Mineral Deposit Genesis and Exploration)
A new heterotrophic strain, named Providencia sp. JAT-1, was isolated and used in bioleaching of low-grade complex copper ore. The strain uses sodium citrate as a carbon source and urea as a nitrogen source to produce ammonia. The optimal growth condition of the strain is 30 C, initial pH 8, sodium citrate 10 g/L and urea 20 g/L, under which the cell density and ammonia concentration in the medium reached a maximum of 4.83 × 108 cells/mL and 14 g/L, respectively. Ammonia produced by the strain is used as the main lixiviant in bioleaching. Bioleaching results revealed that higher strain growth led to a higher copper recovery, while higher pulp density will cause a greater inhibitory effect on strain growth and ammonia production. The copper extraction reached the highest value of 54.5% at the pulp density of 1%. Malachite, chrysocolla and chalcocite are easy to leach out in this bioleaching system while chalcopyrite is difficult. Results of comparative leaching experiments show that bioleaching using JAT-1 is superior to ammonia leaching at the same condition. The metabolites produced by the strain other than ammonia are also involved in bioleaching. View Full-Text
Keywords: karst bauxite; stable isotope; Dopolan; Zagros; Iran karst bauxite; stable isotope; Dopolan; Zagros; Iran
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Ellahi, S.S.; Taghipour, B.; Zarasvandi, A.; Bird, M.I.; Somarin, A.K. Mineralogy, Geochemistry and Stable Isotope Studies of the Dopolan Bauxite Deposit, Zagros Mountain, Iran. Minerals 2016, 6, 11.

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