Preparation of chemical manganese dioxide from Moroccan pyrolusite mine waste

Darmane, Y.; Cherkaoui, Mohammed; Kitane, S.; Alaoui, Abdallah; Sebban, A.; Touhami, M. Ebn

doi:10.1016/j.hydromet.2008.01.007

Cited by 28 publications

(11 citation statements)

References 10 publications

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“…Many synthetic approaches have been employed to prepare manganese dioxide. [13][14][15][16] The sol-gel combustion technique is a novel way with a unique combination of the chemical sol-gel process and the combustion process. The synthesis has been used to create different ceramic systems.…”

Section: Introductionmentioning

confidence: 99%

Effect of Manganese Dioxide Dispersion on the Absorbing Properties of Manganese Dioxide (MnO₂)‐Epoxy Composites

Ting

2009

J Chinese Chemical Soc

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Manganese dioxide (MnO2) particle was synthesized and introduced into epoxy resin to be microwave absorber. The spectroscopic characterization of the formation processes of MnO2 was studied by using X‐ray diffraction (XRD) and scanning electron microscopy (SEM). Microwave absorbing properties with different volume fractions of MnO2 were investigated by measuring complex permittivity, complex permeability and reflection loss in the 2–18 and 18–40 GHz microwave frequency range using the free space method. The absorbing performance of MnO2‐epoxy composites at same sample thickness and at various sample thickness were also studied. It was found that the best absorbing property and an absorption frequency range shifting could be obtained at the frequency range of 2–18 and 18–40 GHz.

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Section: Introductionmentioning

confidence: 99%

Effect of Manganese Dioxide Dispersion on the Absorbing Properties of Manganese Dioxide (MnO₂)‐Epoxy Composites

Ting

2009

J Chinese Chemical Soc

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“…These conditions provide a porous blackish-brown product which is a mixture of manganese oxides. The principal reaction is given below in the presence of manganese [28]:…”

Section: Naclomentioning

confidence: 99%

Effects of iron and manganese on the formation of HAAs upon chlorinating Chlorella vulgaris

Wang

et al. 2011

Journal of Hazardous Materials

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“…Sulfuric acid and different reducing agents have been used for leaching of pyrolusite. The most important reducing agents include ferrous iron solution (Dundua and Agniashvili, 1999), sulfite (Pet rie, 1995; Alaoui et al, 2013), hydrogen peroxide (Jiang et al, 2003) and hydrochloric acid (Darmane et al, 2008).…”

Section: Introductionmentioning

confidence: 99%

Application of Box-Behnken design to determine the optimal conditions of reductive leaching of MnO2 from manganese mine tailings

Alaoui¹,

Kacemi

Ass

et al. 2015

Russ. J. Non-ferrous Metals

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Management of mining manganese residues by a hydrometallurgical processing is a solution to remedy the harmful presence of manganese residues in nature. Understanding the mechanism that governs the leaching process is a major importance to optimize the various factors involved in the reaction; this article is devoted to this subject. The application of leaching process to extracting Mn from a manganese mine tail ings was investigated using a software based design of experiments. The Box-Behnken experimental design was used to provide data for modeling and the variables of model were potassium oxalate concentration, solid to liquid ratio and sulphuric acid concentration. The recoveries of Mn are selected as response of design. The optimum condition under which the Mn recoveries are the highest is determined using statistical analysis and analysis of variance (ANOVA). A quadratic model with good adherence to the experimental data in the domain analyzed was developed, which was used to plot the response surface curves and to perform pro cess optimization. The results showed that Mn recovery was 80% under the optimum conditions: a ratio S/L = 50 g/L-70 g/L approximately; also, sulfuric acid concentration is 1.1 to 1.3 M and oxalate concentration in range 0.35 to 0.45 M, time and temperature of the process were 30 min and 25°C, respectively. The method ology employed allowed to evaluate and identify the effects and interactions of the considered variables with sta tistical meaning in the process response, i.e., the highest recovery of Mn after 30 min of reaction.

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Preparation of chemical manganese dioxide from Moroccan pyrolusite mine waste

Cited by 28 publications

References 10 publications

Effect of Manganese Dioxide Dispersion on the Absorbing Properties of Manganese Dioxide (MnO₂)‐Epoxy Composites

Effect of Manganese Dioxide Dispersion on the Absorbing Properties of Manganese Dioxide (MnO₂)‐Epoxy Composites

Effects of iron and manganese on the formation of HAAs upon chlorinating Chlorella vulgaris

Application of Box-Behnken design to determine the optimal conditions of reductive leaching of MnO2 from manganese mine tailings

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Preparation of chemical manganese dioxide from Moroccan pyrolusite mine waste

Cited by 28 publications

References 10 publications

Effect of Manganese Dioxide Dispersion on the Absorbing Properties of Manganese Dioxide (MnO2)‐Epoxy Composites

Effect of Manganese Dioxide Dispersion on the Absorbing Properties of Manganese Dioxide (MnO2)‐Epoxy Composites

Effects of iron and manganese on the formation of HAAs upon chlorinating Chlorella vulgaris

Application of Box-Behnken design to determine the optimal conditions of reductive leaching of MnO2 from manganese mine tailings

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Product

Resources

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Effect of Manganese Dioxide Dispersion on the Absorbing Properties of Manganese Dioxide (MnO₂)‐Epoxy Composites

Effect of Manganese Dioxide Dispersion on the Absorbing Properties of Manganese Dioxide (MnO₂)‐Epoxy Composites