Mineralogy, geochemistry and stable iosotope studies of the dopolan bauxite deposit, Zagros Mountain, Iran

Ellahi, Somayeh Salamab, Taghipour, Batoul, Zarasvandi, Alireza, Bird, Michael I., and Somarin, Alireza K. (2016) Mineralogy, geochemistry and stable iosotope studies of the dopolan bauxite deposit, Zagros Mountain, Iran. Minerals, 6 (1). pp. 1-21.

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Abstract

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.

Item ID: 43979
Item Type: Article (Refereed Research - C1)
Keywords: Zagros, karst bauxite, Dopolan, stable isotope, Iran
Additional Information:

This is an open access article distributed under the Creative Commons Attribution License (CC BY) which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

ISSN: 2075-163X
Funders: Shiraz University, Iran
Date Deposited: 04 May 2016 07:31
FoR Codes: 04 EARTH SCIENCES > 0402 Geochemistry > 040203 Isotope Geochemistry @ 50%
04 EARTH SCIENCES > 0403 Geology > 040307 Ore Deposit Petrology @ 50%
SEO Codes: 84 MINERAL RESOURCES (excl. Energy Resources) > 8401 Mineral Exploration > 840199 Mineral Exploration not elsewhere classified @ 100%
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