Studies on reaction mechanism of bioleaching of manganese ore

Acharya, Celin; Kar, Ratan; Sukla, Lala Behari

doi:10.1016/s0892-6875(03)00239-5

Cited by 81 publications

(30 citation statements)

References 9 publications

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“…It uses the inherent ability of microorganisms that enables them to convert insoluble conjugated minerals into their soluble and extractable forms (Chen et al, 2011;Das, Ghosh, Mohanty, & Sukla, 2015a). Micro-organisms can solubilize metals both directly and indirectly (Acharya, Kar, & Sukla, 2003). Direct mechanism involves the obtaining of electrons directly from the reduced elements.…”

Section: Introductionmentioning

confidence: 99%

Bioleaching of manganese from mining waste residues using Acinetobacter sp.

Ghosh

Das

2017

Geology, Ecology, and Landscapes

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The rapid decrease of natural resources and generation of huge amount of metallic wastes from mining industries has led to the focus of researchers to shift to alternative methods of waste benefaction and resource recycling. This study aims at the development of an eco friendly technique to recover Manganese (Mn) from mining waste residues using Acinetobacter sp. Bioleaching experiments were conducted in shake flasks at initial pH 6.5, 5% w/v inoculums and 2% pulp density at 30 °C with agitation speed 200 RPM and Acinetobacter sp. as inoculum. Mn recovery of 76% was recorded in 20 days. The analysis of the changes in cellular protein expression and conformation was carried out through sodium dodecyl sulphate polyacrylamide gel electrophoresis (SDS PAGE) and fourier transform infrared spectroscopy. The results reveal that bioleaching can alter protein expression and also result in conformational changes in protein structure. The present study sheds light on the greener alternative to recover and recycle manganese from wastes native bacteria. Exciting prospects for the utilization of mining wastes are in store in the near future; providing an economic and ecologically sound alternative to pyrometallurgical processes.

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Section: Introductionmentioning

confidence: 99%

Bioleaching of manganese from mining waste residues using Acinetobacter sp.

Ghosh

Das

2017

Geology, Ecology, and Landscapes

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“…Therefore, in recent years, hydrometallurgical recovery of Mn from low-grade manganese ore is an encouraging technology because it meets the clean production and lowcarbon economy requirements. Nowadays, various reducing agents are proving to effectively extract manganese from lowgrade manganese ore, including leaching with sulfur dioxide (Petrie, 1995;Naik et al, 2000;Naik et al, 2002;Naik et al, 2003;Zheng et al, 2007), pyrite (Kanungo, 1999;Vračar and Cerović, 2000), hydrogen peroxide (El Hazek et al, 2006;Nayl et al, 2011), ferrous ion (Zhang et al, 2015a), oxalic acid (Sahoo et al, 2001), organic reductants (Trifoni et al, 2000;Hariprasad et al, 2007;Kursunoglu and Kaya, 2013;Yi et al, 2015) and bio-reductions (Konishi et al, 1997;Acharya et al, 2003). Among these reduction processes, Mn reduction leaching by SO 2 has proven to be promising because of the advantages of rapid leaching rate (Grimanelis et al, 1992;Zhang and Cheng, 2007b), high leaching efficiency (Naik et al, 2000), and selectivity of Mn leaching (Khalafalla and Pahlman, 1981;Naik et al, 2000).…”

Section: Introductionmentioning

confidence: 99%

Study on Separation of Manganese from Iron in High-Iron Pyrolusite Ore by Leaching with Simulated Flue Gas

Deng

et al. 2017

J. Chem. Eng. Japan / JCEJ

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Due to the depletion of high-grade manganese ore, much attention has turned to recover manganese from low-grade ores; however, these are usually associated with high-iron content. Moreover, the conventional process of extracting Mn from iron-rich low grade manganese oxide ore focused on recovery of Mn, while ignoring the leaching characteristics of Fe. Hence, simultaneous investigations on leaching behavior and separation e ciency of both manganese and iron were carried out for attaining high recovery of manganese with low iron content from the high-iron low-grade pyrolusite ore using simulated ue gas as the reductant. The e ects of leaching parameters, ue gas components and initial particle size on the leaching e ciency of Mn and Fe were studied, and the results indicated that higher separation e ciency of Mn from iron was achieved at lower SO 2 concentration, O 2 concentration and suitable pulp density. The experimental validation revealed that 93.12% Mn and only 2.57% Fe were extracted under the optimal operating conditions: SO 2 percentage of 5%, O 2 percentage of 1%, reaction temperature of 35°C, solid-to-liquid ratio of 250 g/L, and more than 120 min. Kinetic modelling has indicated that the Mn leaching rate is controlled by the rate of di usion of SO 2 /O 2 from the gas phase to the liquid phase, and the rate of di usion of product or reactants to the ore surface through an inert product layer is the rate-limiting step for Fe dissolution.

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“…1,4 Moreover, it requires a reaction temperature of above 900 °C, which most reactors cannot withstand. 1,[5][6][7] Thus, it is of practical significance to develop a clean, energy-saving, and environmentally friendly technical route to reduce the low-grade pyrolusite.…”

Section: Introductionmentioning

confidence: 99%

Overall Reduction Kinetics of Low-grade Pyrolusite Using a Mixture of Hemicellulose and Lignin as Reductant

Long

et al. 2015

Kem. Ind.

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Manganese is widely used in many fields. Many efforts have been made to recover manganese from low-grade pyrolusite due to the depletion of high-grade manganese ore. Thus, it is of practical significance to develop a clean, energy-saving and environmentally friendly technical route to reduce the low-grade pyrolusite. The reported results show that biomass wastes from crops, crop waste, wood and wood waste are environmentally friendly, energy-saving, and low-cost reducing agents for roasting reduction of low-grade pyrolusite. Kinetics of the reduction reactions is necessary for an efficient design of biomass reduction of pyrolusite. Therefore, it is important to look for a general kinetics equation to describe the reduction of pyrolusite by different kinds of biomass, because there is a wide variety of biomass wastes, meaning that it is impossible to investigate the kinetics for each biomass waste. In this paper, thermal gravimetric analysis and differential thermal analysis were applied to study the overall reduction kinetics of pyrolusite using a mixture of hemicellulose and lignin, two major components of biomass. Overall reduction process is the overlap of the respective reduction processes. A new empirical equation based on the Johnson-Mehl-Avrami equation can be used to describe the respective reduction kinetics using hemicellulose and lignin as reductants, and the corresponding apparent activation energy is 30.14 kJ mol −1 and 38.91 kJ mol −1 , respectively. The overall kinetic model for the reduction of pyrolusite by the mixture of hemicellulose and lignin can be simulated by the summation of the respective kinetics by considering their mass-loss fractions, while a unit step function was used to avoid the invalid conversion data. The obtained results in this work are necessary to understand the biomass reduction of pyrolusite and provide valuable assistance in the development of a general kinetics equation.

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Studies on reaction mechanism of bioleaching of manganese ore

Cited by 81 publications

References 9 publications

Bioleaching of manganese from mining waste residues using Acinetobacter sp.

Bioleaching of manganese from mining waste residues using Acinetobacter sp.

Study on Separation of Manganese from Iron in High-Iron Pyrolusite Ore by Leaching with Simulated Flue Gas

Overall Reduction Kinetics of Low-grade Pyrolusite Using a Mixture of Hemicellulose and Lignin as Reductant

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