EFFECT OF IRON ON ENERGY CONSUMPTION AND CURRENT EFFICIENCY OF ZINC ELECTROWINNING FROM SULFATE SOLUTIONS

2010 ◽  
Vol 7 (1-2) ◽  
pp. 61-66 ◽  
Author(s):  
Vanessa de Freitas Cunha Lins ◽  
Renata Abelha ◽  
Maria das Mercês Reis de Castro ◽  
Marina Maciel Dias de Souza ◽  
Leticia Lanza de Moraes ◽  
...  
Keyword(s):  
Energy Consumption ◽  
Current Efficiency ◽  
Zinc Electrowinning ◽  
Sulfate Solutions

The Influence of Anode Composition on Energy Consumption and Current Efficiency in Zinc Electrowinning

2017 ◽  
Vol 164 (7) ◽  
pp. E166-E172 ◽  
Author(s):  
Somayeh Dashti ◽  
Fereshteh Rashchi ◽  
Massoud Emamy ◽  
Ehsan Vahidi
Keyword(s):  
Energy Consumption ◽  
Current Efficiency ◽  
Zinc Electrowinning

Effect of Flow Pattern on Energy Consumption and Properties of Copper Powder in the Electrolytic Process

2018 ◽  
Vol 279 ◽  
pp. 77-84 ◽  
Author(s):  
Wen Tang Xia ◽  
Xiao Yan Xiang ◽  
Wen Qiang Yang ◽  
Jian Guo Yin
Keyword(s):  
Energy Consumption ◽  
Current Efficiency ◽  
Flow Pattern ◽  
Copper Powder ◽  
Dendritic Structure ◽  
Electrolysis Cell ◽  
Powder Size ◽  
Low Oxygen ◽  
Electrolysis Process ◽  
Electrolytic Process

Because of distinctive properties, such as dendritic structure, high green strength, and low oxygen content, electrolytic copper powder has been widely used in aviation, aerospace, national defense industry and other domains. But at present, energy consumption of the electrolysis process in copper powder production is high, and the current efficiency is only about 90%. Therefore,the decrease in energy consumption of the electrolysis process has become the major bottlenecks in the development of the enterprises. In this paper, a new electrolysis cell with different electrolyte inlet arranged on the cell was manufactured. Then, the effect of flow pattern of electrolyte on the current efficiency, energy consumption and properties of copper powder was investigated. The experimental results showed that the electrolytic process had the higher current efficiency, lower energy consumption and smaller copper powders when the flow rate is 0.5l/min in the paralleled inlet and 1.5 l/min in the traditional inlet. Under the optimal conditions, the current efficiency, energy consumption and copper powder size were 99.10%, 712.90kw∙h/t and 47.80um respectively. This means an obvious rise in current efficiency and decrease in energy consumption compared to traditional feeding method.

Reducing the energy consumption and cell sludge of the zinc electrowinning process by using a pyramid-shaped 3D-Pb anode

2019 ◽  
Vol 190 ◽  
pp. 105188 ◽  
Author(s):  
Xiaocong Zhong ◽  
Fanghui Chen ◽  
Huaping Nie ◽  
Ruixiang Wang ◽  
Zhifeng Xu
Keyword(s):  
Energy Consumption ◽  
Zinc Electrowinning

Metal Instabilities and its Effect on Cell Performance during Aluminium Smelting

2013 ◽  
Vol 828 ◽  
pp. 45-54 ◽  
Author(s):  
Anupam Agnihotri ◽  
Shail Umakant Pathak ◽  
Jyoti Mukhopadhyay
Keyword(s):  
Energy Consumption ◽  
Current Efficiency ◽  
Cell Voltage ◽  
Aluminum Electrolysis ◽  
Cell Performance ◽  
Consumption Pattern ◽  
Magnetic Current ◽  
Zero Current ◽  
Aluminium Smelting ◽  
Rolling Noise

The Hall-Heroult process for the production of aluminium is based on the electrochemical reduction of alumina (Al2O3) dissolved in a cryolite (Na3AlF6) based electrolyte. Instability in cell voltage is referred to as noise. Normal voltage noise is inevitable due to bubble evolution and it has little effect on performance parameters such as, current efficiency and power consumption. Metal rolling noise (wavy noise) is caused by the disturbances in cell magnetic field and it affects the cell current efficiency adversely. Investigating the causes of the cell instability in the aluminium smelting cells can lead to better cell performance. Understanding the variation in cell voltage is critical for cells, because magnitude of voltage determines the energy consumption pattern in the process and hence, any saving on voltage can save energy. Voltage affects the current efficiency of the cell and an optimum cell voltage leads to higher current efficiency without compromising on energy consumption. Magnetic, current distribution, heat loss and voltage at zero current measurements along with online current and voltage signal can help to identify the problems and their combined effects on the performance of the cells. In order to estimate the loss in current efficiency of the aluminum electrolysis cells due to metal instabilities, measurements were performed and data analyzed. The present paper analyses the effect of voltage fluctuations (noise) during metal instability along with cause of instability and its effect on current efficiency of the cell. Measurements carried out to estimate the deviations from the normal cell operations are also discussed.

Efficiency of Different Mass Transfer Modes in Electrochemical Oxidation Treatment for Landfill Leachate

2012 ◽  
Vol 599 ◽  
pp. 60-66 ◽  
Author(s):  
Jin Guo Dai ◽  
Qian Wu Song ◽  
Qi Wu
Keyword(s):  
Mass Transfer ◽  
Energy Consumption ◽  
Transfer Coefficient ◽  
Mass Transfer Coefficient ◽  
Current Efficiency ◽  
Electrochemical Oxidation ◽  
Landfill Leachate ◽  
Oxidation Rate ◽  
Water Jet ◽  
Pressure Water

The effect of different mass transfer ways in landfill leachate treatment by electrochemical oxidation was studied, the electrochemical oxidation rate, current efficiency and energy consumption were mainly discussed by four different mass transfer ways—including higher pressure water jet electrode, aeration, mixing and natural convection. The results show that mass transfer way has an important influence for NH4+-N and CODcr removal in electrochemical oxidation landfill leachate, high pressure water jet has high current efficiency, oxidation rate and lower energy consumption, which is 7.41 mg/L.min, 48% and 0.11 Kwh/gNH4+-N in electrolytic 6 hours, respectively. Different mass transfer ways have different mass transfer coefficient, improving mass transfer coefficient could increase transfer rate and the overall efficiency of system.

scholarly journals A Study on the Application Characteristics of the Insoluble MMO (Mixed Metal Oxide) Electrode for Energy Reduction of Zinc Electrowinning Process

2020 ◽  
Vol 42 (9) ◽  
pp. 424-430
Author(s):  
Mijung Park ◽  
Taeksoon Lee
Keyword(s):  
Energy Consumption ◽  
Metal Oxide ◽  
Energy Use ◽  
Deposition Efficiency ◽  
High Energy ◽  
Alloy Electrode ◽  
Mixed Metal Oxide ◽  
Zinc Electrowinning ◽  
Oxide Electrode ◽  
Zinc Deposition

Objective : The zinc electrowinning industry is one of the high energy consumption industries where energy saving is required. In the zinc electrowining process, electrode is a high energy consuming part. In order to reduce energy use in the electrolytic smelting industry, a comparative study was conducted on the current usage of Pb+Ag alloy electrode and insoluble composite metal oxide (MMO) electrode.Methods : In this study, a comparative evaluation of energy consumption was conducted between the generally used Pb+Ag alloy electrode and an insoluble MMO electrode. Aluminum was used as a reducing electrode. The actual on-site zinc electrowinning solution and ZnSO₄ simulated solution were prepared to estimate the electrode potential, voltage, zinc deposition efficiency, and lifetime characteristics under the current density of 500 A/m².Results and Discussion : The overvoltage of the insoluble MMO electrode was 28.9% lower and the voltage was 15.0% lower than that of Pb+Ag alloy electrode. The zinc deposition efficiency of the insoluble MMO electrode was higher 1.9% in the actual on-site zinc electrowinning solution and 6.3% in the simulated solution. Compared with the Pb+Ag alloy electrode in use, the insoluble composite metal oxide electrode exhibited low overvoltage, good voltage characteristics, and high current efficiency characteristics.Conclusions : When the energy consumption of the Pb+Ag alloy and the insoluble MMO electrodes was compared, The insoluble MMO electrode showed 17.0% lower energy consumption in the actual on-site zinc electrowinning solution and 23.8% lower in the ZnSO₄ simulated solution than Pb+Ag alloy electrode.

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