Reductive leaching of manganese from low grade Sinai ore in HCl using H2O2 as reductant

Hazek, M.N. El; Lasheen, T.A.; Helal, Ahmed

doi:10.1016/j.hydromet.2006.05.006

Cited by 103 publications

(36 citation statements)

References 16 publications

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“…À medida que essas técnicas de extração de metal foram evoluindo, estes minérios passaram a adquirir maior valor agregado, uma vez que deles são extraídos metais de elevado interesse comercial (Hazek et al, 2006).…”

Section: Processo De Produção Do Cobreunclassified

Impactos Ambientais Em Empresa De Mineração De Cobre

Martim

Santos

2014

REGET

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ResumoA mineração é um dos principais setores da economia brasileira, disponibilizando recursos indispensáveis para o seu desenvolvimento. A obtenção do cobre por lixiviação é responsável pela obtenção de catodos com pureza de 99,9% de cobre, o qual apresenta uma vasta gama de aplicações industriais. No entanto, quaisquer atividades mineradoras ocasionam o surgimento de diversos impactos ambientais. Estes impactos devem ser avaliados para que haja constante busca por ações que promovam sua mitigação. A avaliação de impactos ambientais contribui significativamente para o desenvolvimento do processo de gestão ambiental de qualquer empreendimento. Neste sentido foram utilizadas redes de interação para avaliação de impactos ambientais como metodologia para auxiliar a identificação dos impactos ambientais em ordens diferenciadas e a interação existente entre eles. O uso desta ferramenta no presente estudo permitiu que fossem identificadas as atividades que geram o maior número de impactos ambientais, tais como a extração de malaqueta. Esta análise pode ser utilizada como ferramenta de diagnóstico para a implantação de medidas de prevenção ou correção de impactos negativos ao meio ambiente, promovendo a sustentabilidade.Palavras-chave: Impactos Ambientais. Redes de Interação. Mineração. AbstractMining is one of the major sectors of the Brazilian economy, providing essential resources for its development. The obtained copper leaching is responsible for obtaining cathodes with a purity of 99.9% copper, which has a wide range of industrial applications. However, any mining operations cause the rise of diverse environmental impacts. These impacts should be assessed so that there is constant search for actions that promote their mitigation. The environmental impact assessment is a fundamental tool for the development of environmental management process of any enterprise. In this regard the use of interaction networks for environmental impact assessment is a methodology that allows the identification of these impacts in different orders and the interaction between them. The use of this tool in this study allowed the identification of the activities that generate the greatest number of environmental impacts, such as the extraction of malachita.This analysis can be used as a diagnostic tool for the implementation of measures to prevent or correct negative impacts to the environment, promoting the sustainability.

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Section: Processo De Produção Do Cobreunclassified

Impactos Ambientais Em Empresa De Mineração De Cobre

Martim

Santos

2014

REGET

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“…Metal manganese is a vitally important resource, which has acted as an indispensable role in the national economy, especially for steel industry, preparation of fertilizers, dietary additives, cells and fine chemicals [1,2]. As the rapid development in the past several decades, the comprehensive utilization is relatively low because the grade of rhodochrosite continues to decline and its composition becomes increasingly complicated, which restricts the development of electrolytic manganese industry in China [3].…”

Section: Introductionmentioning

confidence: 99%

Dynamics analysis of extraction of manganese intensified by electric field

Ma¹,

Tao²,

Li³

et al. 2018

AIP Conference Proceedings

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Abstract. In this study, a process reinforcement technology for leaching process of pyrolusite was developed. The electric field was introduced to decrease reaction temperature and improve the leaching rate of pyrolusite. The mechanisms of electric field intensifying leaching process of pyrolusite were investigated through X-ray diffraction (XRD), and Brunauer Emmett Teller (BET) in detail. The results showed that the electric field could decrease obviously the apparent activation energy of leaching process of pyrolusite. The apparent activation energy of the leaching of pyrolusite intensified by electric field was calculated to be 53.76 kJ·mol -1 . In addition, the leaching efficiency of manganese was effectively increased by 10% to 20% than that without electric field under the same conditions. This was because that the electron conduit between Fe (II)/Fe (III) and pyrite was dredged effectively by electric field.

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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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Reductive leaching of manganese from low grade Sinai ore in HCl using H2O2 as reductant

Cited by 103 publications

References 16 publications

Impactos Ambientais Em Empresa De Mineração De Cobre

Impactos Ambientais Em Empresa De Mineração De Cobre

Dynamics analysis of extraction of manganese intensified by electric field

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

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