Separation of zinc from manganese, magnesium, calcium and cadmium using batch countercurrent extraction simulation followed by scrubbing and stripping

Haghighi, Hossein Kamran; Moradkhani, Davood; Salarirad, Mohammad Mehdi

doi:10.1016/j.hydromet.2015.03.007

Cited by 31 publications

(16 citation statements)

References 26 publications

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“…A similar result has already been reported in the literature. 26 Zn(II) was not removed. The aqueous solution was added to the raffinate.…”

Section: Removal Of Mn(ii) and Zn(ii) From The Organic Phasementioning

confidence: 99%

“…14,16,19 Sulfuric acid is by far the most used leachant. 2,[25][26][27][28][29][30][31][32] It provides high zinc recovery whereas most manganese remains in the insoluble residue (Mn(III) and Mn(IV) compounds). A reductant (such as hydrogen peroxide, sulfur dioxide, oxalic acid, carbohydrates etc.)…”

Section: Introductionmentioning

confidence: 99%

“…It has been acknowledged as a versatile renewable reagent for green and sustainable chemical synthesis and processes. 41 Leached Zn(II) can be separated from Mn(II) by chemical precipitation, 22,24 solvent extraction (SX) 2,[25][26][27][28][29][30][31]42 or electrowinning. 16,24 Zn(II) extraction using D2EHPA (di-(2-ethylhexyl)phosphoric acid, a cation exchanger) has been studied since the 1980s.…”

Section: Introductionmentioning

confidence: 99%

“…In general, Zn(II) is preferably extracted over Mn(II) in sulfuric acid medium, but the extraction curves may be close to each other according to the experimental conditions. 26,28,29,42 SX techniques have become essential to the hydrometallurgical processes due to the growing demand for high purity metals and the need to process low-grade ores with great complexity. 42 The aim of this study was to carry out a complete investigation involving leaching of manganese and zinc from spent zinc-MnO 2 dry cells under mild experimental conditions on lab-scale using a weak acid with reducing (formic acid) or complexing (hydrofluoric acid) properties.…”

Section: Introductionmentioning

confidence: 99%

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PROCESSING OF SPENT ZINC-MnO2 DRY CELLS IN VARIOUS ACIDIC MEDIA

et al. 2017

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publicado na web em 04/12/2017 This paper describes a route for recovering manganese and zinc from spent zinc-MnO 2 dry cells via acid leaching. Sulfuric, hydrofluoric and formic acids were used as leachants. Hydrogen peroxide was added as reductant, except for formic acid since it is itself a reductant. Experiments were run at 25-40 o C for 1-3 h. Under the best optimal conditions, over 95 wt.% of zinc and manganese were leached irrespective of the leachant. Leaching of contaminants was strongly dependent on the leachant due to the insolubility of salts or complexing reactions. Zn(II) was best extracted with D2EHPA diluted in n-heptane at pH > 1, particularly from the leachates of weak acids. Mn(II) was much more co-extracted from sulfuric leachates, but was easily scrubbed with dilute leachant (~2 mol L -1 ). Zn(II) striping was possible using 5 mol L -1 H 2 SO 4 . Manganese was isolated as MnO 2 carrying the leached contaminants. High-purity sodium salts of the anions of the leachants were recovered after slow evaporation of the final solution.

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“…A similar result has already been reported in the literature. 26 Zn(II) was not removed. The aqueous solution was added to the raffinate.…”

Section: Removal Of Mn(ii) and Zn(ii) From The Organic Phasementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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PROCESSING OF SPENT ZINC-MnO2 DRY CELLS IN VARIOUS ACIDIC MEDIA

et al. 2017

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“…With respect to the objective of the papers, and our previous studies [28,29], the ranges of 1.00-4.50 for the pH and 5.00-20.00 g/L for the zinc concentration were selected. With respect to this design (Table 2), eighteen solutions with the illustrated initial zinc concentration and the desired pH were prepared.…”

Section: Experimental Design For Determining the Conductivity Relatiomentioning

confidence: 99%

Zinc Extraction Kinetics Studies in the Lewis Cell Based on Conductivity Measurements

Haghighi

Moradkhani

Alamdari

et al. 2015

Trans Indian Inst Met

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In the current study, a novel procedure for studying the zinc solvent extraction kinetics in the Lewis cell is presented. In this study, three steps were followed. In the first step, using the response surface methodology (RSM), the conductivity relation as a function of the pH and the zinc concentration was found. With respect to this model, knowing the pH and the conductivity of a zinc solution, the zinc concentration of the solution is obtained. In the next step, with respect to the RSM design of the experiment, an optimum condition, in which the high extraction of zinc occurred in the Lewis cell, was found to be the pH of 2.88 and the initial zinc concentration of 14.96 g/L. In the final step, the kinetic study was carried out on the solution with the aforementioned condition. Taking into account the mathematical kinetic models obtained by the Lewis cell, the extraction of zinc(II) from a zinc sulfate solution with D2EHPA was limited both by the diffusional and chemical regimes.

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