Ferrous poisoning of surface MnO2 during manganese greensand operation

Outram, John G.; Couperthwaite, Sara J.; Millar, Graeme J.

doi:10.1016/j.jece.2017.06.006

Cited by 12 publications

(4 citation statements)

References 19 publications

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“…At a given reaction time, with increasing Fe 2+ concentration from 0.4 mol/L to 0.7 mol/L, the leaching efficiency of Mn increased from 59.2 to 97.5% because more Fe 2+ can directly reduce Mn in EMAS. 28,29 In Figure 1b, with increasing H 2 SO 4 concentration, the leaching efficiency of Mn in EMAS increased. When the concentration of H 2 SO 4 was increased to 1.6 mol/L, the leaching efficiency of Mn was 97.5%.…”

Section: Resultsmentioning

confidence: 94%

Enhanced Leaching of Mn from Electrolytic Manganese Anode Slime via an Electric Field

et al. 2021

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Electrolytic manganese anode slime (EMAS) contains many Mn resources, and efficient Mn leaching is the key to realizing its high-value utilization. In this study, the effects of Fe2+ concentration, H2SO4 concentration, liquid–solid mass ratio, reaction temperature, and current density on Mn leaching efficiency were investigated. The enhanced leaching kinetics and mechanism of Mn from EMAS were analyzed. The results showed that the leaching efficiency of Mn in EMAS was 97.5%, the Pb content in the leaching residue was 42.24 wt % at a current density of 120 mA/cm2, the concentration of Fe2+ was 0.7 mol/L, the concentration of H2SO4 was 1.6 mol/L, the mass ratio of liquid–solid was 6 mL/g, and the reaction time and temperature were 150 min and 333 K. The leaching mechanism showed that the closed-cycle system of Fe2+–Fe3+–Fe2+ was formed in the process of electric field leaching, and Fe2+ and Fe3+ became the electron transport media, which realized the oxidation–reduction leaching of MnO2 and Fe2+ in EMAS. Leaching kinetics indicated that the apparent activation energy is 38.38 kJ/mol and the apparent efficiency equation is 1–2/3X – (1 – X)2/3 = A exp(−38.38/RT)t. This study provides a new method for resource utilization of EMAS.

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Section: Resultsmentioning

confidence: 94%

Enhanced Leaching of Mn from Electrolytic Manganese Anode Slime via an Electric Field

et al. 2021

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“…MnO 2 can increase the Mn content in zeolite from 0.19% to 0.85%. In addition to the role of MnO 2, which helps the deposition of metal ions, manganese green sand has pore dimensions of 0.45 ×10 -6 -2.67×10 -6 mm, and the number of pores is quite large so that it can absorb particles with smaller sizes than pores (Outram et al, 2017). Furthermore, the Fe ion adsorption process modeled by the Freundlich equation (Figure 4) is better than the Langmuir equation (Figure 5).…”

Section: Adsorption Isothermic Model Analysismentioning

confidence: 99%

Adsorption of Iron and Manganese Ions from Mine Acid Water Using Manganese Green Sand in Batch Process

Kusdarini,

Sania,

Budianto

2023

J. Ecol. Eng.

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Fe and Mn metal ions in acid mine drainage can contaminate water bodies and soil, endangering human health. In this study, the adsorption of Fe and Mn in acid mine drainage was carried out using manganese greensand. This study aimed to obtain 1) the adsorption model of Fe and Mn isotherms using manganese greensand and 2) the surface morphology of manganese greensand before and after the adsorption process. This study used laboratoryscale experimental methods with variable concentrations of Fe (325, 400, 475, 550, 625 mg/L) and Mn (432, 507, 582, 657, 732 mg/L). The Freundlich and Langmuir adsorption isotherm models were used to determine the adsorption capacity of Fe and Mn by manganese greensand. Test for Fe and Mn content using the AAS method and test the surface morphology and content of manganese greensand using SEM-EDX. The results showed that:(1) the Freundlich equation test yielded for Fe: in a constant R 2 of 0.9862, n = 0.6912, KB = 0.2180 mg/g, while the Langmuir equation test yielded in a constant R 2 of 0.8836, b = 0.0051 L/mg, q m = 169.4915 mg/g; the Freundlich equation test yielded for Mn: in a constant R 2 of 0.9923, n = 0.8651, KB = 1.0445 mg/g, while the Langmuir equation test yielded in a constant R 2 of 0.6615, b = 0.0010 L/mg, q m = 500 mg/g; (2) The surface morphology of manganese greensand before contact with acid mine drainage contains needle-shaped particles of uniform size with a hexagonal structure, whereas, after contact with acid mine drainage, the particles are clumped like cotton and form needles with varying sizes.

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“…Operationally, greensand is placed in a fixed bed column and continuous regeneration applied wherein the inlet water stream is dosed with bleach (or KMnO 4 ) to oxidize the Mn(II) content and continuously activate the greensand bed . The residual soluble Mn(II) is removed by the greensand bed through a proposed adsorption-oxidation mechanism with the residual oxidant. , Further limitations of greensands were reported in relation to the copresence of Fe(II) in solution, which was shown to cause fouling of the greensand surface …”

Section: Introductionmentioning

confidence: 99%

“…16,19 Further limitations of greensands were reported in relation to the copresence of Fe(II) in solution, which was shown to cause fouling of the greensand surface. 20 The performance of manganese oxide-based greensand appears to depend upon material composition. In particular, previous studies highlighted the capacity of todorokite, which has a tunneled MnO 2 structure, as an ionic sieve for removal of heavy metal cations and radionuclides from water.…”

Section: Introductionmentioning

confidence: 99%

Comparison of Powdered and PVC-Bound Todorokite Media for Heavy Metal Removal from Acid Mine Drainage Tailings

Outram

Couperthwaite

Millar

2018

Ind. Eng. Chem. Res.

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Acid mine drainage (AMD) is a prevalent danger to the environment as it contains high concentration of heavy metals at an acidic pH. Conventional treatment methodologies, such as lime neutralization, are an effective tool to raise the pH and significantly reduce the heavy metal concentration. However, solvated manganese is difficult to remove due to its high stability at alkaline pH, and conventional media treatment options for Mn(II) may not be appropriate for AMD. The need arises for an effective Mn(II) removal process from lime-treated AMD. This work investigates the preparation and applicability of poly(vinyl chloride) bound todorokite (PVC-T) beads as a means to scrub high Mn(II) concentration from lime neutralized AMD. While demonstrating lowered exchange kinetics due to mesoporous surface pores, the PVC-T suffered no capacity reduction when compared to the free todorokite powder (11 mg/g compared to 13 mg/g). Moreover, they were found to remove significant quantities of Mn(II) from lime neutralized AMD in a fixed bed column at a capacity of 7.76 mg/g. The PVC-T beads also markedly outperformed conventional greensands treatment and showed further capacity for Zn(II) and Co(II) removal. This work indicated that producing PVC/todorokite granules is an effective means of utilizing free powders in a fixed bed column to remedy real world environmental hazards.

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Ferrous poisoning of surface MnO2 during manganese greensand operation

Cited by 12 publications

References 19 publications

Enhanced Leaching of Mn from Electrolytic Manganese Anode Slime via an Electric Field

Enhanced Leaching of Mn from Electrolytic Manganese Anode Slime via an Electric Field

Adsorption of Iron and Manganese Ions from Mine Acid Water Using Manganese Green Sand in Batch Process

Comparison of Powdered and PVC-Bound Todorokite Media for Heavy Metal Removal from Acid Mine Drainage Tailings

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