Dynamic behavior of Ni-H2SO4 system at high anodic potentials and different electrolysis conditions

Kovtun, V. N.; Bolotin, A. V.

doi:10.1007/s11175-005-0012-4

Cited by 3 publications

(3 citation statements)

References 3 publications

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“…It was reported that the passive film formed on nickel surface in low concentrations of sulfuric acid is formed by NiOOH or NiO and Ni 2 O 3 . On the other hand, β-NiSO 4 .6H 2 O was suggested as the passive compound formed in very high concentrations of sulfuric acid (ABDALLAH et al 2003;OHTSUKA et al 1979;KOVTUN et al 2005). But Ni solubilization can be reached by modification of leaching conditions e.g.…”

Section: Resultsmentioning

confidence: 99%

Study of Ni And Cd Bioleaching from Spent Ni-Cd Batteries

Velgosová¹,

Kaduková²,

Marcinčáková³

2012

Nova Biotechnologica Et Chimica

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In the present work the Ni and Cd extraction from the electrode material of spent Ni-Cd batteries by bioleaching using the bacteria Acidithiobacillus ferrooxidans was examined. The possibility of the use of the bacteria for both the Ni and Cd recovery was analyzed. The anode of Ni-Cd batteries contains Ni 0 , Ni(OH) 2 , Cd 0 and Cd(OH) 2 . The cathode is covered by nickel hydroxides and nickel oxy-hydroxides. The pH values and content of Ni and Cd in the solution were monitored throughout the experiment (the initial pH was 1.5, the experiment took 28 days). The bioleaching efficiency of Ni and Cd from anode powder reached 5.5% and 98%, respectively. During the cathode powder bioleaching Ni and Cd efficiency reached 45% and 100%, respectively. Throughout the bioleaching process mainly the dissolution of hydroxides occurred meanwhile Ni 0 leaching was not observed. The AAS analysis was used to analyze the amount of Ni and Cd in the solutions. The amount of Ni and Cd present in the solid samples before and after bioleaching was examined using X-ray analysis.

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Section: Resultsmentioning

confidence: 99%

Study of Ni And Cd Bioleaching from Spent Ni-Cd Batteries

Velgosová¹,

Kaduková²,

Marcinčáková³

2012

Nova Biotechnologica Et Chimica

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“…In [6] study it is presented that in nickel electrode 0,5 M H 2 SO 4 solution in anode polarization curvestransmitted in potential giving speed of 5 mV/ s, in "plus"1,4-1,7 V potential range the metal passivized and 4-6 nm thickness oxide layer with electron passing property is developed .…”

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confidence: 99%

“…6 presents that on anode polarization curve put on nickel electrode in sulfuric media, when potential shifts to positive value, the metal firstly melts according to the regularity; in high potentials it passivates, passivating products (oxide layers) cover fully the surface of the electrode and completely stops metal's melting.The above mentioned studies prove that not all findings and conclusions are presented on electrochemical properties of nickel electrode. Thus it is important to study the electrochemical properties of nickel polarized by alternating current.…”

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confidence: 99%