Effects of certain impurities on zinc electrowinning in high-purity synthetic solutions

Ault, A. R.; Frazer, E. J.

doi:10.1007/bf01022254

Cited by 59 publications

(19 citation statements)

References 20 publications

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“…Leaching results in the formation of zinc sulfate in the aqueous sulfuric acid and the metal is then produced by electrodeposition [1]. However, electrodeposition of zinc is extremely sensitive to the presence of certain metallic impurities [2][3][4][5] in the electrolyte. Although high purity zinc metal can be electrodeposited from ultrapure zinc sulphate solutions, rigorous electrolyte purification is economically non viable.…”

Section: Introductionmentioning

confidence: 99%

Effects of 1-butyl-3-methylimidazolium hydrogen sulfate-[BMIM]HSO4 on zinc electrodeposition from acidic sulfate electrolyte

Zhang

2008

J Appl Electrochem

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A comparative study of the effect of 1-butyl-3-methylimidazolium hydrogen sulfate-[BMIM]HSO 4 and gelatine on current efficiency (CE), power consumption (PC), deposit morphology, and polarization behaviour of the cathode during electrodeposition of zinc from acidic sulphate solutions were investigated. Compared with the traditional industrial additive, gelatine, the addition of [BMIM]HSO 4 was found to increase current efficiency, reduce power consumption, and improve the surface morphology. Maximum CE and minimum PC were obtained at the addition dosage of 5 mg dm -3 . Meanwhile, simultaneous addition of the two additives induced a blocking effect of the zinc reduction and led to more leveled and fine-grained cathodic deposits. Moreover, cyclic voltammetry results and kinetic parameters such as Tafel slope, transfer coefficient, and exchange current density obtained from Tafel plots led to the conclusion that both additives have a pronounced inhibiting effect on Zn 2? electroreduction. The data obtained from X-ray diffractogram revealed that the presence of additives did not change the structure of the electrodeposited zinc but affected the crystallographic orientation of the crystal planes.

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Section: Introductionmentioning

confidence: 99%

Effects of 1-butyl-3-methylimidazolium hydrogen sulfate-[BMIM]HSO4 on zinc electrodeposition from acidic sulfate electrolyte

Zhang

2008

J Appl Electrochem

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“…Ault et al [16] observed that Sb(III) had a very detrimental effect on coulombic efficiency and also exerted a strong grain-refining effect on the zinc deposit. Nevertheless, Sb(III) also plays a beneficial role when combined with some organic additives producing optimum CE and acceptable surface morphology of the deposits [13,[23][24][25][26][27][28][29].…”

Section: Introductionmentioning

confidence: 98%

“…Over the past decades, the effects of numerous impurities such as cobalt and nickel [6][7][8][9][10], manganese [10][11][12], antimony [3][4][5][13][14][15][16], copper [1,8,17,18], iron [17,18], cadmium [17], germanium [8,15,19,20], and tin [21] on the CE and polarization behavior as well as their effects on deposit morphology and crystallographic orientations of the cathode during electrodeposition of zinc from acidic sulfate electrolyte have been studied. Although small concentrations of these impurities dramatically reduce the CE, their effects on deposit morphology and orientation as well as cathodic polarization are quite different.…”

Section: Introductionmentioning

confidence: 99%

Effects of antimony(III) on zinc electrodeposition from acidic sulfate electrolyte containing [BMIM]HSO4

Zhang

et al. 2009

J Appl Electrochem

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The effect of antimony(III) on the cathodic current efficiency (CE), power consumption (PC), deposit morphology, and polarization behavior during electrodeposition of zinc from acidic sulfate solutions containing 1-butyl-3-methylimidazolium hydrogen sulfate-[BMIM] HSO 4 was investigated. The results indicated that the addition of Sb(III) alone decreased the CE, increased the PC, and deteriorated the quality of the zinc electrodeposits. However, the combined addition of Sb(III) and[BMIM]HSO 4 was found to be beneficial for zinc deposition and improved the surface morphology of the zinc electrodeposits. Maximum CE and minimum PC were obtained at the combined addition of 0.02 mg dm -3 Sb(III) and 5 mg dm -3 [BMIM]HSO 4 . Depolarization of the cathode was noted in the presence of Sb(III) alone in the electrolyte whereas this effect was partly counteracted by the addition of [BMIM]HSO 4 . Cathodic polarization curves were traced and analyzed to determine the electrokinetic parameters such as Tafel slope, transfer coefficient, and exchange current density so as to elucidate the nature of the electrode reactions. The data obtained from X-ray diffractogram revealed that the presence of Sb(III) did not change the structure of the electrodeposited zinc but affected the crystallographic orientation of the crystal planes.

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“…For this reason, many studies have been made on the effects of electrolysis conditions on the morphology of deposited Zn. These electrolysis conditions include the current density, [4][5][6][7] temperature, flow rate, solution composition, 8,9) and addition of inorganic 10,11) and organic [12][13][14][15] compounds to the bath. Among these factors, the addition of inorganic compounds is important in commercial production lines.…”

Section: Introductionmentioning

confidence: 99%

Effects of Small Amounts of Molybdenum, Tungsten, or Tin Additives on the Morphology and Orientation of Electrodeposited Zinc

Nakano

Oue

Taniguchi³

et al. 2008

ISIJ Int.

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Effects of certain impurities on zinc electrowinning in high-purity synthetic solutions

Cited by 59 publications

References 20 publications

Effects of 1-butyl-3-methylimidazolium hydrogen sulfate-[BMIM]HSO4 on zinc electrodeposition from acidic sulfate electrolyte

Effects of 1-butyl-3-methylimidazolium hydrogen sulfate-[BMIM]HSO4 on zinc electrodeposition from acidic sulfate electrolyte

Effects of antimony(III) on zinc electrodeposition from acidic sulfate electrolyte containing [BMIM]HSO4

Effects of Small Amounts of Molybdenum, Tungsten, or Tin Additives on the Morphology and Orientation of Electrodeposited Zinc

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