Electrical and Electrochemical Behavior of Fluidized Bed Electrodes: I . Potential Transients and Time‐Averaged Values

Huh, Tae Myung

doi:10.1149/1.2100452

Cited by 18 publications

(12 citation statements)

References 6 publications

(8 reference statements)

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“…For currents of 5, 10, 15, 20 and 25 A, the requisite backstripping rates required to match the data in Figure 8 were 2.5, 4, 6, 8 and 10 ppm min )1 , respectively, in comparison to the experimental values obtained by simply shutting off the current that were on the order of 1 ppm min )1 . The larger values, plus the dependence on current is consistent with enhanced backstripping due to the existence of anodic zones (e.g., [25]). …”

Section: Electrodeposition Modelmentioning

confidence: 66%

Copper recovery in a spouted vessel electrolytic reactor (SBER)

Shirvanian

Calo

2005

J Appl Electrochem

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An investigation of copper recovery from acidic solutions in a particulate, cylindrical spouted vessel of conductive particles is presented. The effects of current, initial copper ion concentration, supporting electrolyte concentration, particle loading, liquid flow rate, solution pH, and temperature on copper recovery rate, current efficiency and energy efficiency of the electrolytic deposition process were investigated under galvanostatic conditions. Experiments were also conducted to investigate the effects of backdissolution or 'backstripping' of the deposited metal in the acidic solution. It is hypothesized that the latter occurs via both chemical and electrochemical anodic oxidation in the bed of conductive particles. It was found that sparging of the electrolyte solution with selected gases to remove dissolved oxygen increased the current efficiency by as much as 30% under certain conditions. Finally, a numerical kinetic model of electrochemical deposition and backstripping, coupled with mass transfer in the particulate cathode bed, is presented that describes the behaviour of the net copper recovery curves reasonably well. List of symbolsa electrode area per unit volume (m )1 ) C j concentration of species j (mol m )3 ) C js concentration of species j at electrode surface (mol m )3 ) C metal cation concentration in solution, initial (ppm or mol m )3 ) C O initial metal cation concentration in solution, initial (ppm or mol m )3 )backstripping rate constant pre-exponential factor (ppm min )1 )/(mol kg )1 bar )1 ) K B backdissolution rate (mol m )3 s )1 ) K H Henry's law constant for oxygen in water (mol oxygen (kg water) -1 (bar )1 ) n apparent reaction order n j number of electrons in rate j r b backstripping rate (ppm min )1 ) r j rate of reaction or mass transport (mol m )3 s )1 ) R gas constant (J K )1 mol )1 ) Re p particle Reynolds number (= u d p /m) ScSchmidt number (= m/D) Sh particle Sherwood number (= k L d p /D) t time (s) T temperature (K) DH Ã 0 heat of activation at equilibrium potential (kJ mol )1 ) a transfer coefficient (Equation 10) m kinematic viscosity (m 2 s )1 )

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Section: Electrodeposition Modelmentioning

confidence: 66%

Copper recovery in a spouted vessel electrolytic reactor (SBER)

Shirvanian

Calo

2005

J Appl Electrochem

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“…It is noted that although the “fit” values are generally of the same order as the measured values, they tend to be consistently larger, which may reflect enhanced corrosion due to effects such as the occurrence of local anodic zones in the moving bed cathode. 46 …”

Section: Resultsmentioning

confidence: 99%

II. Electrodeposition/Removal of Nickel in a Spouted Electrochemical Reactor

Grimshaw

Calo

Shirvanian

et al. 2011

Ind. Eng. Chem. Res.

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An investigation is presented of nickel electrodeposition from acidic solutions in a cylindrical spouted electrochemical reactor. The effects of solution pH, temperature, and applied current on nickel removal/recovery rate, current efficiency, and corrosion rate of deposited nickel on the cathodic particles were explored under galvanostatic operation. Nitrogen sparging was used to decrease the dissolved oxygen concentration in the electrolyte in order to reduce the nickel corrosion rate, thereby increasing the nickel electrowinning rate and current efficiency. A numerical model of electrodeposition, including corrosion and mass transfer in the particulate cathode moving bed, is presented that describes the behavior of the experimental net nickel electrodeposition data quite well.

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“…Several authors have dealt with charge transfer behaviour in fluidized bed electrodes [1][2][3][4][5][6][7]. However, few papers describe the charge transfer mechanism in stirred heterogeneous systems [8,9].…”

Section: Introductionmentioning

confidence: 99%

Electrochemical impedance and conductivity measurements in a heterogeneous Fe powder particle—electrolyte system with or without electrochemical reaction

et al. 2007

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The participation of solid Fe powder particles in the transfer of charge through a heterogeneous system consisting of an electrolyte and conducting powder particles was studied by means of electrochemical impedance spectroscopy and conductivity measurements. Different behaviour was encountered in electroinactive Na 2 SO 4 electrolyte without metal electrodeposition on the Fe particles and in NiSO 4 electrolyte where Ni electrodeposition occurs on the Fe particle surfaces. From impedance diagrams and the proposed model the formation of aggregates and chains of Fe particles is deduced. The important role of electrochemical reaction proceeding at the particle surface in the charge transfer behaviour in stirred heterogeneous systems was also demonstrated.

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Electrical and Electrochemical Behavior of Fluidized Bed Electrodes: I . Potential Transients and Time‐Averaged Values

Cited by 18 publications

References 6 publications

Copper recovery in a spouted vessel electrolytic reactor (SBER)

Copper recovery in a spouted vessel electrolytic reactor (SBER)

II. Electrodeposition/Removal of Nickel in a Spouted Electrochemical Reactor

Electrochemical impedance and conductivity measurements in a heterogeneous Fe powder particle—electrolyte system with or without electrochemical reaction

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