Effects of metallic and D2EHPA impurities on nickel electrowinning from aqueous sulphate baths

Küzeci, E.; Kammel, Roland; Gogia, S. K.

doi:10.1007/bf00578087

Cited by 24 publications

(5 citation statements)

References 11 publications

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“…The measurements were conducted in a three-electrode cell with a saturated calomel electrode (B521, SI Analytics) as a reference electrode (RE), a 25 mm × 25 mm × 3 mm type 1 glassy carbon plate (Alfa Aesar) as counter electrode (CE), and PyC (pyrolyzed carbon) as a working electrode (WE). An IviumStat 24-bit CompactStat (Ivium, NL) was employed for the electrochemical measurements, and scanning electron microscope–energy dispersion spectroscopy, SEM-EDS (Leo 1450 VP, Zeiss, Germany, INCA-software, Oxford Instruments, UK) was used for the chemical analysis of the electrodes after each EDRR experiment, whereas a Mira 3 Tescan GM (Czech Republic) was used for higher magnification imaging. In addition, the components within the two industrial solution samples investigated were determined using either inductively couple plasma–optical emission spectroscopy or high resolution mass spectroscopy, ICP-OES/HR-MS (OES: Iris intrepid, Thermo Fisher Scientific, USA, and HR-MS: Nu AttoM, Nu Instruments Ltd., UK, housed at GTK, Espoo).…”

Section: Methodsmentioning

confidence: 99%

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Platinum Recovery from Industrial Process Solutions by Electrodeposition–Redox Replacement

Halli

Heikkinen

Elomaa

et al. 2018

ACS Sustainable Chem. Eng.

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In the current study, platinum—present as a negligible component (below 1 ppb, the detection limit of the HR-ICP-MS at the dilutions used) in real industrial hydrometallurgical process solutions—was recovered by an electrodeposition–redox replacement (EDRR) method on pyrolyzed carbon (PyC) electrode, a method not earlier applied to metal recovery. The recovery parameters of the EDRR process were initially investigated using a synthetic nickel electrolyte solution ([Ni] = 60 g/L, [Ag] = 10 ppm, [Pt] = 20 ppm, [H2SO4] = 10 g/L), and the results demonstrated an extraordinary increase of 3 × 105 in the [Pt]/[Ni] on the electrode surface cf. synthetic solution. EDRR recovery of platinum on PyC was also tested with two real industrial process solutions that contained a complex multimetal solution matrix: Ni as the major component (>140 g/L) and very low contents of Pt, Pd, and Ag (i.e., <1 ppb, 117 and 4 ppb, respectively). The selectivity of Pt recovery by EDRR on the PyC electrode was found to be significant—nanoparticles deposited on the electrode surface comprised on average of 90 wt % platinum and a [Pt]/[Ni] enrichment ratio of 1011 compared to the industrial hydrometallurgical solution. Furthermore, other precious metallic elements like Pd and Ag could also be enriched on the PyC electrode surface using the same methodology. This paper demonstrates a remarkable advancement in the recovery of trace amounts of platinum from real industrial solutions that are not currently considered as a source of Pt metal.

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Section: Methodsmentioning

confidence: 99%

“…In hydrometallurgical industries, significant amounts of impurities − and some additives − are present in the base metal (Cu, Ni, Zn)-rich process solutions. The presence of such contaminants can be either detrimental to the process/base metal product or beneficial as they help improve process operation and feasibility.…”

Section: Introductionmentioning

confidence: 99%

Platinum Recovery from Industrial Process Solutions by Electrodeposition–Redox Replacement

Halli

Heikkinen

Elomaa

et al. 2018

ACS Sustainable Chem. Eng.

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“…for copper, nickel or zinc deposition on the permanent or seed plate cathode. Hydrometallurgical process streams differ typically from synthetic plating baths, as they contain a huge variety of base metal ions, impurities and also precious metal ions [8][9][10][11][12][13][14][15][16][17][18][19][20][21]. Typically, valuable metals such as Ag are present at ppb-ppm level, making their selective recovery challenging.…”

Section: Introductionmentioning

confidence: 99%

A future application of pulse plating – silver recovery from hydrometallurgical bottom ash leachant

Elomaa

Halli

Sirviö

et al. 2018

Transactions of the IMF

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In the current study, electrodeposition-redox replacement was applied for hydrometallurgical solution with the main elements of Ca (13.8 g/L), Al (4.7 g/L), Cu (2.5 g/L), Zn (1.2 g/L), Fe (1.2 g/L), S (1 g/L), Mg (0.8 g/L), P (0.5 g/L) and Ag (3.5 ppm). The solution originated from the leaching experiment of incinerator plant bottom ash, which was dissolved into 2 M HCl media at T = 30 °C. The resulting deposit on electrode surface was analysed with SEM-EDS and the observed Ag/(Cu+Zn) ratio (0.3) indicated remarkable enrichment of silver on the surface, when compared to the ratio of these elements (Ag/(Cu+Zn)) in the solution (6.8•10-5). The enrichment of Ag vs. (Cu+Zn) could be demonstrated to increase ca. 4500 fold compared to ratio of the elements in solution.

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“…21 Once z E-mail: hjg.csu@gmail.com these hydrophobic ligands are entrained into the electrolytes, they could present the undesired effects on the following deposition process, such as appearance of the cracks, peels or pits on the deposit surface. [22][23][24][25][26] Hence, it's worthwhile to understand the effect of the hydrophobic ligands in the electrolytes on metal deposition, which will allow the morphologies of metal deposits to be better controlled.…”

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confidence: 99%

Inhibiting Mossy Zinc Electrodeposits from Ammoniacal Media with Hydrophobic Tetraalkyammonium Salts

Liu

et al. 2016

J. Electrochem. Soc.

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The effect of tetraalkyammonium chlorides (TAACs) with different numbers of long alkyl chain (-C 8 H 17 ) on zinc electrodeposits in the ammoniacal media was systematically investigated by voltammetric measurements, scanning electron microscopy and X-ray diffraction. It was found that the inhibition effect of TAACs on mossy zinc deposits increases with increasing their hydrophobicity. The hydrophobic TAACs can improve the smoothness and crystallinity of zinc deposits and change the most preferred orientation. Meanwhile, the inhibition effect of hydrophilic octyltrimethylammonium chloride (OTAC) on mossy zinc deposits can be enhanced with increase of OTAC concentration. The improvement on the smoothness of zinc deposits with hydrophobic methyltrioctylammonium chloride (TOAC) is dependent on the pH of electrolyte. The presence of saturated TOAC at pH 7.5 can produce better zinc deposits with higher smoothness. The inhibition mechanism of both hydrophilic and hydrophobic TAACs on mossy zinc deposits has been elucidated. These results will allow the morphology of metal deposits to be better controlled by the specific organic additives.

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Effects of metallic and D2EHPA impurities on nickel electrowinning from aqueous sulphate baths

Cited by 24 publications

References 11 publications

Platinum Recovery from Industrial Process Solutions by Electrodeposition–Redox Replacement

Platinum Recovery from Industrial Process Solutions by Electrodeposition–Redox Replacement

A future application of pulse plating – silver recovery from hydrometallurgical bottom ash leachant

Inhibiting Mossy Zinc Electrodeposits from Ammoniacal Media with Hydrophobic Tetraalkyammonium Salts

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