Modelling of silver anode dissolution and the effect of gold as impurity under simulated industrial silver electrorefining conditions

Aji, Arif T.; Halli, Petteri; Guimont, Amaury; Wilson, Benjamin P.; Aromaa, Jari; Lundström, Mari

doi:10.1016/j.hydromet.2019.105105

Cited by 2 publications

(11 citation statements)

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“…Silver dissolution as a function of electrolyte concentrations and temperature [14]. c. Effect of Au content in anode due to anode passivation [15]. d. Electrode overpotential [16].…”

Section: Methodsmentioning

confidence: 99%

“…The tests were conducted at different concentrations and temperature of electrolyte. Statistical analysis the developed models has demonstrated that every model presented in [13][14][15][16] fulfils the requirements of a good model.…”

Section: Methodsmentioning

confidence: 99%

“…Anode passivation due to Au content in anodes [15] Electrode overpotential [16] High current density silver electrorefining [14] Anode and impurities (Au and Cu)…”

Section: Kinetics Modellingmentioning

confidence: 99%

“…Effect of Au Electrolyte conductivity modelling [13] Silver electrolyte properties Energy consumption, IR drop modelling [16] Figure 2. Method of the investigation on the aspects for the high current density (HCD) application (dashed box) is based on the anodic [14][15][16] and electrolytic [13,16] modelling.…”

Section: Kinetics Modellingmentioning

confidence: 99%

“…The schematic of the conductivity modellings and their correlation are shown in Figure 3. [14][15][16] and electrolytic [13,16] modelling.…”

Section: Kinetics Modellingmentioning

confidence: 99%

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The Optimum Electrolyte Parameters in the Application of High Current Density Silver Electrorefining

Aji

Aromaa

Lundström

2020

Metals

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Increasing silver production rate has been a challenge for the existing refining facilities. The application of high current density (HCD) as one of the possible solutions to increase the process throughput is also expected to reduce both energy consumption and process inventory. From the recently-developed models of silver electrorefining, this study simulated the optimum electrolyte parameters to optimize the specific energy consumption (SEC) and the silver inventory in the electrolyte for an HCD application. It was found that by using [Cu2+] in electrolyte, both objectives can be achieved. The suggested optimum composition range from this study was [Ag+] 100–150 g/dm3, [HNO3] 5 g/dm3, and [Cu2+] 50–75 g/dm3. HCD application (1000 A/m2) in these electrolyte conditions result in cell voltage of 2.7–3.2 V and SEC of 0.60–1.01 kWh/kg, with silver inventory in electrolyte of 26–39 kg silver for 100 kg per day basis. The corresponding figures for the conventional process were 1.5–2.8 V, 0.44–0.76 kWh/kg, and 15.54–194.25 kg, in respective order. These results show that, while HCD increases SEC by app. 30%, the improvement provides a significant smaller footprint as a result of a more compact of process. Thus, applying HCD in silver electrorefining offers the best solution in increasing production capacity and process efficiency.

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“…Silver dissolution as a function of electrolyte concentrations and temperature [14]. c. Effect of Au content in anode due to anode passivation [15]. d. Electrode overpotential [16].…”

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

“…Anode passivation due to Au content in anodes [15] Electrode overpotential [16] High current density silver electrorefining [14] Anode and impurities (Au and Cu)…”

Section: Kinetics Modellingmentioning

confidence: 99%