Electrowinning of zinc from alkaline solutions at high …

Affiliations. Département de génie métallurgique, École Polytechnique, Campus de l''université de Montréal, Succursale A, Case postale 6079, H3C-3A7, Montréal, Québec, Canada

Evaluation of the alkaline electrolysis of zinc (Technical …

In primary zinc production, the energy-saving potential for the alkaline process was estimated to be greater than 10%, even when significantly larger electrolysis current densities than those required for the sulfate process are used. The principal technical advantages of the alkaline process are that it can handle low-grade, high-iron-content ...

Efficient electrowinning of zinc from alkaline electrolytes

The electrowinning of zinc from sodium hydroxide solutions

The electrowinning of zinc from sodium hydroxide solutions

2014-5-1 · We obtain zinc powder from the alkaline electrolyte of smithsonite by electrowinning. • The potential has a great impact on the Zn ion behavior on the cathode. • The diffusion coefficient of Zn ions is 3.22 × 10 − 6 cm 2 /s in this solution. • There is an energy waste stage at the beginning of electrowinning. •

Preparation of Zinc Powders by Acid Electrowinning

2019-6-13 · During the electrowinning of zinc in a mixture electrolyte of zinc sulfate and ammonium sulfate, the effects of current density, Zn2+ mass concentration and electrolytic additives on the morphology and current efficiency of Zn powders were evaluated. Finer Zn powders were obtained at high current density and low Zn2+ mass concentration. However, …

Modeling Zinc Electrowinning for Current Efficiency …

2018-10-18 · Zinc electrowinning is by nature complex, involving the electrodeposition of Zn ions on cathode, oxygen evolution on the anode, as well as the hydrogen evolution on the cathode as a side reaction which decreases the current efficiency and increases the energy consumption while improving local mass transport. Because of the capital-intensive ...

Efficient electrowinning of zinc from alkaline electrolytes

CA-2270428-A1 chemical patent summary.

10.1016/j.hydromet.2014.03.006 | DeepDyve

2020-6-11 · It has been reported that the best specific energy can be 1.75 kWh/kg with 1000 A/m 2 in the alkaline electrowinning ( St-Pierre and Piron, 1986 ). Compared to the 3.3 kWh/kg with 500 A/m 2 in the classical industrial process, large energy can be saved. ... The present work could give guidance on the practical zinc electrowinning from alkaline ...

Modeling Zinc Electrowinning for Current Efficiency …

for the Zn electrowinning process are very similar to the copper electrowinning process, which have been discussed in the previous works.17-18 Governing equations.—Mass transfer.—In the Zn electrowinning process, the mass transfer is comprised of three processes: diffusion, migration, and convection. In the electrolyte, the governing equation

The alkaline electrolytic process for zinc production: a …

The alkaline leach and electrolysis process for zinc production is compared to the conventional acid sulfate process in terms of both energy saving and technical merit. In addition, the potential for industrial application of the alkaline process is discussed on the basis of present market conditions, possible future zinc market scenarios, and the probability of increased secondary …

-,alkaline leaching-electrowinning process ...

2015-10-18 · 1 lorine removal from zinc-bearing wastes in alkaline leaching-electrowinning process;- 2.The effects of impurities on the quality of the metallic zinc powder and the current efficiency in zinc alkaline leaching-electrowinning process are investigated. -,。

A Mathematical Model of a Zinc Electrowinning Cell

2010-9-7 · SCOTT, A.C., PITBLADO, R.M. and BARTON, G.W. A mathematical model of a zinc electrowinning cell. APCOM 87. Proceedings of the Twentieth International Symposium on the Application of Computers and Mathematics in the Mineral Industries. Volume 2: Metallurgy. Johannesburg, SAIMM, 1987. pp. 51-62. A Mathematical Model of a Zinc Electrowinning Cell

Industrial-Scale Production of Zinc Powder Using Alkaline …

2017-7-23 · An integrated process consisted of raw materials milling and grinding, leaching, purification, electrowinning, regeneration of the spent electrolytes, vacuum drying, analysis, etc. is developed, and the industrial application flow sheet is designed, with annual yield 1500–2000 tons metallic zinc powder.

Leaching and solvent extraction purification of zinc from

2021-1-15 · A number of research studies have been conducted on the alkaline leaching of zinc oxide ores. ... The maximum Fe and Mn impurities concentration in the solution entering the electrowinning unit ...

Removal of Tin from Alkaline Zinc Solution by Zinc Powder …

2010-6-20 · Abstract: In this work, the influence of tin on electrowinning of zinc from alkaline solution was observed. Tin changed the deposited zinc into compact form, made zinc hardly peel off from cathodes and should be separated from alkaline electrolyte before zinc electrowinning. Experiments for Sn removal from alkaline zinc solution by several ...

Production of ultrafine zinc powder from wastes …

Production of ultrafine zinc powder from wastes containing zinc by electrowinning in alkaline solution - Zhao Youcai, Li Qiang, Zhang Chenglong, Jiang Jiachao. Product. Resources. Pricing. Blog. Product. Resources. Pricing. Blog. 2013. DOI: 10.1590/s0104-66322013000400017 View full text |Buy / Rent full text | |

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) was found for instance that at 1000 A/m 2 energy consumption was only 1.75 kWh/kg. The current efficiency was up to 3000 A/m 2; impurities were also less detrimental than in acid media.. The structure of the powdery …

Electrowinning of Zinc and Lead from Alkaline Solutions

2017-7-23 · The optimum conditions for zinc electrowinning are zinc concentration 30–40 g/L, current density 800–1000 A/m², NaOH concentration 180–200 g/L, …

Zinc Electrowinning & Zinc Cathodes

2017-6-3 · The process has come down to the present day essentially unchanged and consists of three basic steps: Leaching of roasted zinc concentrates in dilute H2SO4; for example, ZnO + H2SO4 → ZnSO4 + H2O. Purification of the …

Zinc powder preparation from zinc dross

2022-7-25 · The zinc powder was produced from zinc dross in an alkaline solution. Various set of experiments were conducted and the results obtained reveals the following conclusions. 1. A high purity of zinc powder (99.5 %) is possible to produce from zinc dross by using porous metallic container in an alkaline solution at room temperature. 2.

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 …

Research progress in anodes for zinc electrowinning

2020-12-15 · Publish Date: 2021-05-01. Abstract. Abstract. Traditional lead anodes are widely used in production of zinc by electrowinning due to their low cost, good conductivity and easy processing. However, the corrosion of lead anodes during the electrolytic process has also lead to the pollution of zinc products and electrolyte and increase of anode ...

Alkaline leaching of lead and zinc by sodium hydroxide: …

2018-4-1 · The alkaline concentration plays a very important role in the metals leaching process. To investigate the influence of NaOH concentration on the leaching rate of lead and zinc, the experiments were carried out in the leaching solutions containing different NaOH concentrations (0.5, 1, 2 and 4 M) at temperature of 70 °C, stirring speed of 500 rpm and L/S ratio of 20 ml/g, …

Efficient electrowinning of zinc from alkaline electrolytes

1996-11-21 · We claim: 1. A method for electrowinning metallic zinc from zinc ion in aqueous solution, said method comprising performing electrolysis on a mixture of solid conductive particles and aqueous alkali solution, said solution ranging in concentration from about 3N to about 20N alkali and containing dissolved zinc ion at an initial concentration ranging from about 50 to …

Particle Size Refinement of Zn Electrodeposits in Alkaline …

2017-12-16 · Electrowinning of zinc from alkaline solutions is a promising technology for the treatment of low-grade zinc ores and industrial wastes which are not amenable to the typical acid electrolysis process [1,2]. It offers significant energy savings and high productivity as compared to the acid process [3,4]. Moreover [5,6], the alkaline ...

Electrowinning of zinc from alkaline solutions at high …

The growing cost of industrial production and international competition give an increased importance to research in alternative zinc extraction technologies. Among the possibilities, electrowinning in alkaline solutions was presented previously as the most promising. Experiments have been done at high current densities to obtain cell voltage and current efficiency data …

Zinc electrowinning from acidic chloride solutions

2010-1-1 · Zinc electrowinning tests from acidic chloride solutions showed that metallic impurities can be classified in the following order of detrimental effect on …

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, …

Zinc Electrowinning Plant Design

Zinc electrowinning mainly produce LME Zn-CATH-1 zinc cathode from ZnSO4 or Ammonium electrolyte. Modern plant of zinc electro-winning usually consists of electrolyte circulating system, electrolysis current supply, zinc cathode …

Zinc Electrowinning Plant Design

Zinc Electrowinning Plant Design & Configuration. Zinc electrowinning mainly produce LME Zn-CATH-1 zinc cathode from ZnSO4 or Ammonium electrolyte. Modern plant of zinc electro-winning usually consists of electrolyte circulating …

On the Electrowinning of Zinc from Alkaline Zincate …

1991-7-1 · The cathode current efficiency for the electrowinning of zinc was determined under different conditions of alkali concentration (2–8M), current density (10–40 mA · cm −2), and temperature (30–75°C). Some remarkably high values of current efficiency were observed especially at 75°C. A possible mechanism involving the discharge of ...

Electrodeposition of Zinc from Acid Based …

Zinc was electrodeposited from alkaline and acidic electrolytes using direct current DC or Pulse Current (PC). The zinc coating was subsequently protected against corrosion with a chrome (III) layer. Morphology and structure of the …

On the Electrowinning of Zinc from Alkaline Zincate …

1991-7-1 · The cathode current efficiency for the electrowinning of zinc was determined under different conditions of alkali concentration (2–8M), current density (10–40 mA · cm −2), and temperature (30–75°C).Some remarkably high values of current efficiency were observed especially at 75°C.

Electrowinning of zinc from alkaline solutions | Semantic …

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 …

Hierarchical Heterostructure Engineering of Layered …

2022-7-30 · Aqueous alkaline rechargeable nickel-zinc (Ni–Zn) batteries possess great potential for large-scale energy storage systems because of their high output voltage, cheap cost, and intrinsic safety. However, the practical applicability of Ni–Zn batteries has been limited by traditional Ni-based cathodes with low capacity and poor cycle stability.

On the Electrowinning of Zinc from Alkaline Zincate …

On the Electrowinning of Zinc from Alkaline Zincate Solutions @article{Afifi1991OnTE, title={On the Electrowinning of Zinc from Alkaline Zincate Solutions}, author={Safa E. Afifi and A. Ebaid and Mohamed Hegazy and Kheirkhah Donya}, journal={Journal of The Electrochemical Society}, year={1991}, volume={138}, pages={1929-1933} } ...