Lab-scale circulation process of electrolytic manganese production with low-grade pyrolusite leaching by SO2

Sun, Wei; Su, Shijun; Wang, Hongtao; Ding, Sanglan

doi:10.1016/j.hydromet.2012.12.005

Cited by 67 publications

(12 citation statements)

References 20 publications

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“…The world rapidly growing demand for manganese has made it increasingly important to develop processes for economical recovery of manganese from low grade manganese ores [47]. Various direct reductive leaching processes have been studied and developed for processing low manganese ores, including leaching with ferrous iron [48,49], organic reductants [50,51], bio-reductions [52,53], and sulfur dioxide [54][55][56][57][58]. Among these processes, the leaching with sulfur dioxide is proved promising attributing to the advantages of fast leaching rate, high Mn extraction rate and selectivity leaching of Mn.…”

Section: Introductionmentioning

confidence: 99%

Adsorption of Congo red from aqueous solution onto pyrolusite reductive leaching residue

Liao

et al. 2013

Desalination and Water Treatment

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A B S T R A C TThis study investigated the potential use of pyrolusite reductive leaching residue (PLR), a low-cost residual solid by-product in manganese hydrometallurgy, as alternative adsorbent for removal of Congo red (CR) from aqueous solution. The surface characteristics of the PLR were measured. The effect of contact time was experimentally studied to evaluate the adsorption capacity, kinetics, and equilibrium. Experimental results revealed that the adsorption process almost finished within 300 min; adsorption capacity of the PLR increased with increasing initial CR concentrations and temperature. CR uptake process obeyed the pseudo-second-order kinetics. The CR uptake process was best described by the Langmuir isotherm with maximum monolayer adsorption capacity of 45.66 mg/g at 25˚C. Thermodynamic studies showed CR adsorption onto the PLR was endothermic and spontaneous in nature. The regeneration studies showed that the PLR has good reuse performance. The results indicated that PLR could be employed as low-cost alternatives for removal of CR from industrial wastewater.

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Section: Introductionmentioning

confidence: 99%

Adsorption of Congo red from aqueous solution onto pyrolusite reductive leaching residue

Liao

et al. 2013

Desalination and Water Treatment

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“…The various reducing agents used for reduction of MnO2 are sulfur dioxide [11], ferrous sulfate [5], biomass [7], cellulose [10] and pyrite, etc [12]. Simultaneously, pyrite is widely concerned as a low cost reducing agent because it can reduce the dosage of sulfuric acid.…”

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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“…Manganese is treated as an industrial major element used for iron and alloy‐steel production because of its utility in deoxidizing and desulfurization . The world manganese demand has been driving by soaring steel production in recent years, especially in China, the biggest production country of manganese products and accounting for almost all the world‘s electrolytic manganese production ,. However, the high‐grade ores are exhausted gradually in China due to unbalanced exploitation and utilization.…”

Section: Introductionmentioning

confidence: 99%

Oxidation of SO₂ by O₂ and Its Effects on Dithionate Formation during Pyrolusite Leaching Process with Mixture Gas Containing SO₂ and O₂

Ding

et al. 2018

ChemistrySelect

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Competitive oxidations of SO2 oxidized by MnO2 and O2 are existed during pyrolusite leaching process with SO2 and O2 mixture gases. Generally, SO2 is oxidized into H2SO4 by O2, and manganese sulfate (MnSO4) and manganese dithionate (MnS2O6) are formed when oxidized by MnO2. Meanwhile, the reaction between SO2 and O2 has effect on the amount of aqueous SO2 oxidized by MnO2 and solution acidity, resulting in the variations of Mn extraction and MnS2O6 formation. In this paper, the competitive mechanism of SO2 oxidation by MnO2 and O2 was firstly discussed based on theoretical analysis of leaching process, and then concentration ratio of O2/SO2 (R) in gas flow was proposed as a determined parameter to characterize the competition, the effects of R on Mn extraction, H2SO4 generation and MnS2O6 formation. The results showed that R was the determined parameter for evaluating the oxidation effect of O2 on SO2, which had a decisive effect on H2SO4 concentration, and eventually affects MnS2O6 formation and Mn extraction under constant gas flow (10 L⋅min−1) and others experimental factor. With the increase of R, the H2SO4 concentration increased gradually but the formation of MnS2O6 sharply decreased to negligible amount when R >10, and Mn extraction increased first and then decreased significantly. The most suitable R for obtaining MnSO4 product was R=10 with 1.4 g⋅L−1 S2O62- , 96% Mn extraction and 0.07 M H2SO4.

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Lab-scale circulation process of electrolytic manganese production with low-grade pyrolusite leaching by SO2

Cited by 67 publications

References 20 publications

Adsorption of Congo red from aqueous solution onto pyrolusite reductive leaching residue

Adsorption of Congo red from aqueous solution onto pyrolusite reductive leaching residue

Dynamics analysis of extraction of manganese intensified by electric field

Oxidation of SO₂ by O₂ and Its Effects on Dithionate Formation during Pyrolusite Leaching Process with Mixture Gas Containing SO₂ and O₂

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Lab-scale circulation process of electrolytic manganese production with low-grade pyrolusite leaching by SO2

Cited by 67 publications

References 20 publications

Adsorption of Congo red from aqueous solution onto pyrolusite reductive leaching residue

Adsorption of Congo red from aqueous solution onto pyrolusite reductive leaching residue

Dynamics analysis of extraction of manganese intensified by electric field

Oxidation of SO2 by O2 and Its Effects on Dithionate Formation during Pyrolusite Leaching Process with Mixture Gas Containing SO2 and O2

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Oxidation of SO₂ by O₂ and Its Effects on Dithionate Formation during Pyrolusite Leaching Process with Mixture Gas Containing SO₂ and O₂