alkaline electrowinning of zinc

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Electrowinning of zinc from alkaline solutions SpringerLink

The objective of this work was to determine the best conditions for minimizing energy consumption in zinc electrowinning from alkaline solutions. The effects of several variables, i.e. hydroxide concentration (300–500 gl−1), current density (50–1000 A m−2), temperature (24–74°C), cathode material (magnesium, nickel, lead, stainless steels 304 and 316) and impurities (copper and ...

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Electrowinning of Zinc and Lead from Alkaline Solutions ...

2017-7-23  Electrowinning of zinc and lead from alkaline solutions depends on zinc or lead concentrations, temperature, current density, NaOH concentration, electrode distance and electrode material on current efficiency, and energy consumption of zinc or lead electrowinning. The optimum conditions for zinc electrowinning are zinc concentration 30–40 g ...

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Efficient electrowinning of zinc from alkaline ...

1996-11-21  Zinc-air batteries, for example, use an alkaline electrolyte, and an alkaline electrowinning cell would regenerate both the zinc particles and the alkaline electrolyte. Another example is the degalvanizing of (i.e., removal of zinc from) galvanized steel scrap, which is done by electrolytically aided leaching with hot caustic.

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A laboratory-scale investigation of alkaline zinc ...

2003-6-1  The optimum conditions of alkaline zinc electrowinning have been investigated through a series of lab-scale experiments. Electrolyte composition of 25 g/l Zn 2+ and 240 g/l NaOH was utilized and electrolyte temperatures of 35, 50 and 65 °C were investigated. Moreover, current densities of 500, 1000 and 1500 A/m 2 were tried in a 0.5 l volume Plexiglas ® cell where two anodes and a cathode ...

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US5958210A - Efficient electrowinning of zinc from ...

Zinc metal is deposited from an alkali electrolyte solution onto conductive seed particles in an electrowinning process which yields unusually high current efficiency and low energy consumption. US5958210A - Efficient electrowinning of zinc from alkaline electrolytes - Google Patents Efficient electrowinning of zinc from alkaline electrolytes ...

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A laboratory-scale investigation of alkaline zinc ...

Alkaline electrowinning has many advantages versus sulfate electrowinning such as lower electricity consumption and production of highly active zinc powder (Moradkhani et al., 2012). ...

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An Experimental Investigation of Alkaline Zinc ...

This paper presents an experimental investigation of the novel alkaline zinc electrowinning process by using magnesium alloy as cathode and stainless steel as anode. The alkaline electrolyte with 40 g/L Zn2+ and 200 g/L NaOH was selected to be in accordance with the industrial practice. Effects of several electrolysis variables, i.e. current density (500, 1000, 1500 A/m2), temperature (30, 50 ...

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RECENT IMPROVEMENTS IN ZINC ALKALINE

1990-1-1  Zinc alkaline electrowinning has been investigated as an energy-saving technological alternative under high current densities (up to 10 000 A/m 2).It was found for instance that at 1000 A/m 2 energy consumption was only 1.75 kWh/kg. The current efficiency was 100% up to 3000 A/m 2; impurities were also less detrimental than in acid media.. The structure of the powdery deposits depended on the ...

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PRODUCTION OF ULTRAFINE ZINC POWDER FROM

2014-1-10  Production of Ultrafine Zinc Powder from Wastes Containing Zinc by Electrowinning in Alkaline Solution 859 Brazilian Journal of Chemical Engineering Vol. 30, No. 04, pp. 857 - 864, October - December, 2013 Figure 1: Schematics of the apparatus for

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锌电积过程中锰元素对铝阴极的电化学行为影响 - USTB

2017-7-17  Influence of manganese on the electrochemical behavior of an aluminum cathode used in zinc electrowinning[J]. Chinese Journal of Engineering, 2018, 40(7): 800-807. doi: 10.13374/j.issn2095-9389.2018.07.005

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PRODUCTION OF ULTRAFINE ZINC POWDER FROM

2014-1-10  Production of Ultrafine Zinc Powder from Wastes Containing Zinc by Electrowinning in Alkaline Solution 859 Brazilian Journal of Chemical Engineering Vol. 30, No. 04, pp. 857 - 864, October - December, 2013 Figure 1: Schematics of the apparatus for

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An Experimental Investigation of Alkaline Zinc ...

This paper presents an experimental investigation of the novel alkaline zinc electrowinning process by using magnesium alloy as cathode and stainless steel as anode. The alkaline electrolyte with 40 g/L Zn2+ and 200 g/L NaOH was selected to be in accordance with the industrial practice. Effects of several electrolysis variables, i.e. current density (500, 1000, 1500 A/m2), temperature (30, 50 ...

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Selective zinc alkaline leaching optimization and cadmium ...

2012-3-1  Alkaline leaching of zinc-carbon batteries was carried out by Kim et al., with 4 M NaOH, which resulted in a recovery of about 64% Zn and 0.1% Mn, and electrowinning of alkaline leaching solution, produced zinc powder with 99.9% purity (Kim et al., 2008).

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Production of ultrafine zinc powder from wastes

In the electrowinning of zinc from alkaline electrolyte, the overall cell reaction is: According to the following calculation, the value of E in theory for alkaline media electrowinning is lower than that obtained in the typical acid media electrowinning by approximately 0.5 V. The zinc electrowinning process is a one-electron electrode reaction.

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Extraction of Zinc and Manganese from Alkaline and Zinc ...

2016-10-2  Toro et al. developed a patented process for the recycling of alkaline and zinc-carbon spent batteries, where the metals are leached in acid solution in the presence of carbohydrates as reducing agents; after purification of solution, metallic zinc and manganese dioxide are recovered by electrowinning. Alkaline and zinc-carbon batteries were ...

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Zinc Electroplating Products Finishing

2011-2-18  Zinc/cobalt. Alkaline systems for plating zinc/cobalt alloys are easy and economical to operate and produce a deposit with exceptional alloy and thickness uniformity. Like the alkaline nickel alloy process, it is not unusual to actually plate a tri

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PRODUCTION OF ZINC POWDER FROM Co-Zn PLANT

2015-5-6  reported the alkaline leaching of zinc-carbon batteries in 4 M NaOH and obtained a solution with recovery of 64% Zn and 0.1% Mn (Kim et al., 2008). This solution can be followed by electrowinning (EW) of alkaline leaching solution to produce zinc powder with 99.9% purity (Gurmen and Emre, 2003). Zhao and Stanforth (2000) also

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碱浸-电解锌工艺中含锌废渣的除氯研究-【维普期刊官网 ...

The resulted metallic zinc powder quality has been compared by using the dust with and without washing operation by alkaline leaching-electrowinning process. It has thus been found that the total zinc and metallic zinc contents can be expected to be higher by 2 % -

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Leaching and solvent extraction purification of zinc from ...

2021-1-15  An integrated hydrometallurgical process was used for the zinc leaching and purification from a zinc ore containing 9.75 wt% zinc. The zinc minerals in the ore were hemimorphite, willemite, and ...

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锌电积过程中锰元素对铝阴极的电化学行为影响 - USTB

2017-7-17  Influence of manganese on the electrochemical behavior of an aluminum cathode used in zinc electrowinning[J]. Chinese Journal of Engineering, 2018, 40(7): 800-807. doi: 10.13374/j.issn2095-9389.2018.07.005

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Zinc Extraction from Zinc Plants Residue Using Selective ...

Annually, a great amount of zinc plants residue is produced in Iran. One of them is hot filter cake (known as HFC) which can be used as a secondary resource of zinc, cobalt and manganese. Unfortunately, despite its heavy metal content, the HFC is not treated. For the first time, zinc was selectively leached from HFC employing alkaline leaching.

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Extraction of Zinc and Manganese from Alkaline and Zinc ...

2016-10-2  Toro et al. developed a patented process for the recycling of alkaline and zinc-carbon spent batteries, where the metals are leached in acid solution in the presence of carbohydrates as reducing agents; after purification of solution, metallic zinc and manganese dioxide are recovered by electrowinning. Alkaline and zinc-carbon batteries were ...

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ExtractionofZincandManganesefromAlkalineand Zinc ...

2019-7-31  alkaline and zinc-carbon spent batteries, where the metals are leached in acid solution in the presence of carbohydrates as reducing agents; after purification of solution, metallic zinc and manganese dioxide are recovered by electrowinning. Alkaline and zinc-carbon batteries were characterized by several authors [11–14].

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Zinc Electroplating Products Finishing

2011-2-18  Zinc/cobalt. Alkaline systems for plating zinc/cobalt alloys are easy and economical to operate and produce a deposit with exceptional alloy and thickness uniformity. Like the alkaline nickel alloy process, it is not unusual to actually plate a tri

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    T/H

  • Reviews

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PRODUCTION OF ZINC POWDER FROM Co-Zn PLANT

2015-5-6  reported the alkaline leaching of zinc-carbon batteries in 4 M NaOH and obtained a solution with recovery of 64% Zn and 0.1% Mn (Kim et al., 2008). This solution can be followed by electrowinning (EW) of alkaline leaching solution to produce zinc powder with 99.9% purity (Gurmen and Emre, 2003). Zhao and Stanforth (2000) also

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Hydrometallurgical treatment of spent alkaline and zinc ...

2015-6-17  A zinc-carbon battery has a cathode made of a carbon rod which is in contact with carbon and MnO 2, while an alkaline battery has a similar cathode, except there is a steel case instead of a carbon rod. The anode in a zinc-carbon battery consists of a zinc case and the anode of an alkaline battery is a brass rod with powdered zinc (Bernardes et ...

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Monosodium Glutamate as Selective Lixiviant for Alkaline ...

The efficacy of monosodium glutamate (MSG) as a lixiviant for the selective and sustainable leaching of zinc and copper from electric arc furnace dust was tested. Batch leaching studies and XRD, XRF and SEM-EDS characterization confirmed the high leaching efficiency of zinc (reaching 99%) and copper (reaching 86%) leaving behind Fe, Al, Ca and Mg in the leaching residue.

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A Step-by-step Guide to the Zinc Electroplating Process ...

Zinc plating is done in a variety of aqueous solutions, like alkaline cyanide, alkaline non-cyanide, or acid chloride salt solutions. Zinc Electroplating Steps Although the process may vary depending on the requirements, substrate, cost, and the type of finish

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Recovery of zinc from galvanized coatings - Process ...

1. A method for extraction of zinc values in the form of sodium zincate or potassium zincate from an aqueous alkaline solution of zinc, wherein the aqueous alkaline solution is a solution of sodium hydroxide or potassium hydroxide, comprising: (a) subjecting the aqueous alkaline solution to solvent extraction using an organic solution of an extractant containing an oxine group; (b) separating ...

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锌电积过程中锰元素对铝阴极的电化学行为影响 - USTB

2017-7-17  Influence of manganese on the electrochemical behavior of an aluminum cathode used in zinc electrowinning[J]. Chinese Journal of Engineering, 2018, 40(7): 800-807. doi: 10.13374/j.issn2095-9389.2018.07.005

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