Recovery of pure MnSO4∙H2O by reductive leaching of manganese from pyrolusite ore by sulfuric acid and hydrogen peroxide

Nayl, A.A.; Ismail, Ibrahim; Aly, H. F.

doi:10.1016/j.minpro.2011.05.003

Cited by 110 publications

(29 citation statements)

References 18 publications

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“…When the ores mainly contain MnCO 3 , manganese can be obtained directly through acid leaching. When the ores contain MnO 2 , the ores can be treated through reduction roasting followed by acid leaching [4][5][6][7] or directly through reductive leaching in dilute acid medium with different reducing agents, which includes waste tea [8], corncob [9], cornstalk [10], molasses [11], sawdust [12], glucose [13], oxalic acid [14], H 2 O 2 [15,16], SO 2 [17] and sphalerite [18]. Bioleaching technology has also been used to liberate manganese from ores [19].…”

Section: Introductionmentioning

confidence: 99%

Hydrometallurgical Process and Kinetics of Leaching Manganese from Semi-Oxidized Manganese Ores with Sucrose

Wang

Sheng-long

et al. 2017

Minerals

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Abstract:The extraction of manganese from a semi-oxidized manganese ore was investigated with sucrose as the reducing agent in dilute sulfuric acid medium. The kinetics of leaching manganese from the complex ore containing MnCO 3 and MnO 2 was also investigated. The effects of sucrose and sulfuric acid concentrations, leaching temperature and reaction time on the total Mn (TMn), MnO 2 and MnCO 3 leaching were investigated. Results showed that MnCO 3 could more easily react with hydrogen ions than MnO 2 in ores, and MnO 2 decomposition could be advantageous for MnCO 3 leaching. The leaching efficiencies of 91.8% for total Mn, 91.4% for MnO 2 and 96.9% for MnCO 3 were obtained under the following optimized conditions: 0.035 mol/L sucrose concentration, 5 mol/L sulfuric acid concentration, 60 min of reaction time and 363.2 K of leaching temperature. In addition, it was found that the leaching process of semi-oxidized manganese ore follows the shrinking core model and the leaching rate was controlled by chemical reaction and diffusion. The apparent activation energy of the total manganese, MnO 2 , and MnCO 3 leaching were 40.83, 40.59, and 53.33 kJ·mol −1 , respectively.

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Section: Introductionmentioning

confidence: 99%

Hydrometallurgical Process and Kinetics of Leaching Manganese from Semi-Oxidized Manganese Ores with Sucrose

Wang

Sheng-long

et al. 2017

Minerals

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“…The need for manganese is greatest in the steel industry, accounting for more than 90% of the total production [1]. With the rapidly growing demand for manganese and the continuous mining of high-grade manganese ore, considerable research attention has been directed at the recovery of manganese from low-grade ores [2][3][4][5]. However, these low-grade ores are mainly high-valence oxides, such as pyrolusite, which are stable in both acid and alkaline media, so the extraction of manganese from such sources must be carried out under reductive conditions [1,2].…”

Section: Introductionmentioning

confidence: 99%

“…Manganese can be treated by direct acid leaching under reducing conditions. Several inorganic reductants generally employed in acidic media are FeSO 4 [3,4], H 2 O 2 [5], SO 2 [6], and sulfide [7,8]. However, some of these reducing agents, such as SO 2 , may be harmful to the environment, and FeSO 4 may result in a high content of iron in the leaching solution.…”

Section: Introductionmentioning

confidence: 99%

Kinetic Study of the Leaching of Low-Grade Manganese Ores by Using Pretreated Sawdust as Reductant

Sun

Jiang

2017

Minerals

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Abstract:The reductive leaching of manganese from a low-grade manganese oxide ore was investigated by using pretreated sawdust as the reductant in a sulfuric acid medium. The effects of stirring speed, liquid/solid ratio, sawdust/ore mass ratio, sulfuric acid concentration, reaction temperature, and time on the manganese extraction were examined. It was found that the leaching efficiency is strongly dependent on temperature and acid concentration. The leaching efficiency of manganese reached 94.1% under the optimal conditions: stirring speed of 300 rpm, liquid/solid ratio of 8:1, mass ratio of sawdust to ore 0.25, sulfuric acid concentration of 1 mol/L and a temperature of 363 K for 180 min. The kinetic analysis was carried out based on the shrinking core model, which indicated that the reductive leaching process was controlled by the chemical reaction. The reaction orders with respect to the sulfuric acid concentration and mass ratio of sawdust are 1.66 and 0.57, respectively. The apparent activation energy for the leaching process has been calculated using the Arrhenius expression and was found to be 51.7 kJ/mol.

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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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Recovery of pure MnSO4∙H2O by reductive leaching of manganese from pyrolusite ore by sulfuric acid and hydrogen peroxide

Cited by 110 publications

References 18 publications

Hydrometallurgical Process and Kinetics of Leaching Manganese from Semi-Oxidized Manganese Ores with Sucrose

Hydrometallurgical Process and Kinetics of Leaching Manganese from Semi-Oxidized Manganese Ores with Sucrose

Kinetic Study of the Leaching of Low-Grade Manganese Ores by Using Pretreated Sawdust as Reductant

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

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