Dried leaves — Novel reductant for acid leaching of manganese ore

Hariprasad, D.; Ghosh, Malay Kumar; Anand, S.

doi:10.1007/s12666-009-0092-z

Cited by 11 publications

(6 citation statements)

References 20 publications

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“…Hariprasad et al . reported that the dried leaves as a reductant could enrich 90 g/L Mn in the leach liquor. According to Cheng et al .…”

Section: Introductionmentioning

confidence: 99%

“…At present, reports of the feasibilities of hazardous organics for the reduction of manganese peroxide increase. Hariprasad et al [7] reported that the dried leaves as a reductant could enrich 90 g/L Mn in the leach liquor. According to Cheng et al [8] the pyrolusite ore was reduced by biomass cornstalk roasting and then sulfuric acid-leached with 90.2% recovery of manganese.…”

Section: Introductionmentioning

confidence: 99%

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Electrochemical Behavior of Manganese Oxide Ores Using Coke Wastewater in Sulfuric Acid Solution

Kang

Feng

et al. 2019

Env Prog and Sustain Energy

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The coke wastewater reductive leaching of pyrolusite ore in sulfuric acid solution was studied. This study was performed in two stages. First, the influence of tractable and refractory pollutants of coke wastewater on manganese leaching was determined. It was shown that the leaching efficiency of manganese is very sensitive to the decomposition of intractable pollutants. With the decrease of 1.85 g/L CODcr value of those contaminants, the extraction ratio of manganese increased more than 16% and exceeded 97.3%. Second, the corrosion behavior of pyrolusite ore in simulative wastewater solution was investigated using cyclic voltammograms, polarization curves, and Mott–Schottky curves. The reduction of manganese oxide ore by recalcitrant organic compounds involves two courses—the inducing conversion of manganese oxide to MnO·OH intermediate with hydrogen and free electron, which is from the oxidation of easily oxidized substances and the oxidation of persistent organic matter by this derivative. As a consequence, the latter process leads to the increment in manganese extraction efficiency. Coke wastewater is a promising reducing agent for MnO2. Likewise, it could be clarified and recycling. © 2019 American Institute of Chemical Engineers Environ Prog, 38:e13039, 2019

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“…Hariprasad et al . reported that the dried leaves as a reductant could enrich 90 g/L Mn in the leach liquor. According to Cheng et al .…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Electrochemical Behavior of Manganese Oxide Ores Using Coke Wastewater in Sulfuric Acid Solution

Kang

Feng

et al. 2019

Env Prog and Sustain Energy

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“…are reported for the extraction of Mn from low grade ores. Apart from these, the uses of some nonconventional reductants like saw dust, waste paper, dried leaves are also reported. Overall carbohydrates are nonhazardous and low cost reducing agents that may be used either in pure form or as industrial/agricultural wastes. , As the reductive leaching deserves a close investigation, in one of our recent works, we have made an alternative cost-effective approach through reductive leaching of marine nodules using sulfuric acid and paper cuttings as reductant …”

Section: Introductionmentioning

confidence: 99%

“…are reported for the extraction of Mn from low grade ores. Apart from these, the uses of some nonconventional reductants like saw dust, 17 waste paper, 18 dried leaves 19 are also reported. Overall carbohydrates are nonhazardous and low cost reducing agents that may be used either in pure form or as industrial/agricultural wastes.…”

Section: Introductionmentioning

confidence: 99%

Pathway of Sucrose Oxidation in Manganese (Pyrolusite) Nodule

Baral

Dash

Ghosh

et al. 2015

Ind. Eng. Chem. Res.

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Polymetallic sea nodules are the potential resources of copper, cobalt, manganese, and nickel. The exploration and exploitation of manganese nodules are necessary to meet the future demands of Mn in the world. This work describes the valuable extraction of Mn through an innovative approach of using sucrose as a reductant. The metal extraction from the nodule leaching was studied in ambient temperature (27 °C) and at an elevated temperature 90 °C with and without agitation. In both cases, 99.9% of Mn was extracted while the extraction time appears to be significantly low (2 h) at 90 °C but it requires a longer time of 24 h at 27 °C. The optimum sucrose concentration selected was 7% (w/w) of nodule for maximum metal extraction. With use of 10% (v/v) H 2 SO 4 , 7% (w/w) sucrose at 90 °C, and solid to liquid (S/L) ratio of 1:10 the achieved metal recovery figures were the following: Mn >99%, Ni 98%, Cu 87%, Co 83% in 2 h. The oxidation pathway of sucrose is outlined in this study with the aid of mass spectrometry during reductive leaching of ocean bed nodule. Sucrose in acidic environment generates 1-or 6-monoacid of sucrose with ions of m/z (mass-to-charge ratio) 355 and 127, 5-hydroxymethylfurfural (5HMF). A dehydrated glucose complex (m/z 325) was generated at elevated temperature. These released organics act as reductant for the leaching of Mn 2+ from MnO 2 . Glucaric acid (m/z 211) is generated as the end product of the sucrose oxidation in the solution.

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“…[13] For the low-or middle-grade pyrolusite, hydrometallurgy is extensively applied in the reduction of quadrivalence manganese because of its efficiency and economy. Generally, there are three kinds of hydrometallurgical reductants: organic materials including glucose, [14][15][16] sucrose, [17] cellulose, [18] and methanol [19] ; inorganic materials including pyrite, [20] hydrogen peroxide, [21] and sulfur dioxide [22] ; biomass including molasses [23] and molasses alcohol wastewater, [24] sawdust, [25] corncob, [26] dried leaves, [27] waste tea-leaves, [28] and so on. Although there have been many reductants reported on hydrometallurgy, few C 1 organic reductants have been investigated.…”

Section: Introductionmentioning

confidence: 99%

Reductive Leaching of Low-Grade Pyrolusite with Formic Acid

Huang

et al. 2015

Metall Mater Trans B

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The extraction of manganese from low-grade pyrolusite is investigated using formic acid as reductant in sulfuric acid medium. The effects of volumes of formic acid, concentration of sulfuric acid, liquid to solid ratio (L/S), leaching time, and temperature on leaching efficiency of manganese, iron, and aluminum are valuated with single-factor experiments. The results show that the leaching efficiency of manganese reached 90.08 pct with 80.70 pct of iron and 31.55 pct of aluminum under the optical conditions: 15 pct H 2 SO 4 (v/v) 60 ml, 4 ml formic acid, and 2 hours leaching time at 363 K (90°C).

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Dried leaves — Novel reductant for acid leaching of manganese ore

Cited by 11 publications

References 20 publications

Electrochemical Behavior of Manganese Oxide Ores Using Coke Wastewater in Sulfuric Acid Solution

Electrochemical Behavior of Manganese Oxide Ores Using Coke Wastewater in Sulfuric Acid Solution

Pathway of Sucrose Oxidation in Manganese (Pyrolusite) Nodule

Reductive Leaching of Low-Grade Pyrolusite with Formic Acid

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