Effect of Impurities and Additives on the Electrowinning of Zinc.

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SeriesReport of investigations (United States. Bureau of Mines) -- 7966
ContributionsFukubayashi, H., O"keefe, T., Clinton, W.
ID Numbers
Open LibraryOL21739455M

Effect of impurities and additives on the electrowinning of zinc (OCoLC) Online version: Fukubayashi, Harold H. Effect of impurities and additives on the electrowinning of zinc (OCoLC) Material Type: Government publication, National government publication: Document Type: Book: All Authors / Contributors.

THE EFFECT OF IMPURITIES AND ADDITIVES ON THE ELECTROWINNING OF ZINC by HARUHISA FUKUBAYASHI, A DISSERTATION Presented to the Faculty of Graduate School of the UNIVERSITY OF MISSOURI - ROLLA In Partial Fulfillment of the Requirements for the Degree DOCTOR OF PHILOSOPHY in METALLURGICAL ENGINEERING ~t~.

"The effect of various impurities, commonly found in zinc electro-winning solutions, on the surface morphology of deposited zinc was investigated.

Individual additions of the impurities Al, Ag, Cd, Co, Cr, Cu, Ge, Mn, Ni, Sb, Sn, Ti, PbO₂, PbSO₄, and HCl were studied. In a few cases additives of animal glue, gum arabic, and Na₂SiO₃, were used individually or in combination, to Cited by: Effect of Polymer Additives on Zinc Electrowinning T.

Ohgai Department of Materials Process Engineering, Kyushu University 6‐10‐1 Hakozaki, Higashi‐ku Fukuoka ‐, JapanCited by: 1. The zinc electrowinning (EW) process is very sensitive to the presence of impurities.

There is only one EW plant in the world that we know of that operates at moderate current efficiency and deposition times without using any additives. All the others must use them continuously. Additives allow zinc EW to occur at high current efficiencies while suppressing excessive acid mist by: 7.

Effects of additives on zinc electrowinning from zinc sulphate aqueous solution with a higher concentration fluoride ( mg L − 1) have been investigated based on the measurements of polarization curves (PC), cyclic voltammetry (the working electrode was made from pure aluminum, a graphite rod was used as counter and a saturated calomel electrode (SCE) as the reference electrode) and zinc.

The effect of organic additives and some of the impurity foreign cations were also investigated. Fe and Cu impurities on zinc electrowinning from sulphate electrolyte were investigated by. The effect of an organic additive magnafloc and/or zinc on the electrowinning of cadmium from acidic sulfate solutions are studied.

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It is observed that addition of magnafloc increases the current efficiency and decreases the energy consumption both in the absence and presence of zinc. the harmful effects of impurities are: (1) the use of suitable additives, (2) the optimization of zinc electrowinning operating conditions, or (3) the combination of (1) and (2).

The objective of this study was to find an optimum current density and zinc deposition time to suppress. Abstract - Zinc electrowinning is performed with the application of a current through insoluble electrodes (Pb-Ag), causing the electrolysis of zinc sulfate, with or without impurities, and zinc deposition on the cathode of aluminum.

The impurities can reduce the current efficiency and increase the energy consumption in zinc electrolysis. The individual effects of 15 impurities and their interaction with glue on zinc electrowinning from industrial acid sulphate electrolyte were characterized in terms of deposit morphology and preferred deposit orientation and in terms of current efficiency and zinc deposition polarization behaviour.

The current efficiency decreased in a cyclical manner with increasing atomic number of the. Effects of Certain Impurities and Their Interactions on Zinc Electrowinning, The by FOSNACHT, DONALD RALPH and a great selection of related books, art Book Edition: Second Printing. Organic additives are used extensively in zinc electrowinning to assist in controlling the process.

A cyclic voltammetry technique has been developed to provide a rapid, quantitative evaluation of the effectiveness of selected organic additives in minimizing the deleterious effects that impurities, such as antimony, have on zinc deposition.

The effects of sodium laurayl sulphate on the electrowinning of Zinc from acidic sulphate solution were investigated by B.

Tripathy, et al. [26] and the results were compared with glue as the. In Zn electrowinning, a naturally derived glue is added to the electrolytic solution to smooth the cathode surface and prevent impurities from codeposition.1­3) When the glue is added to the electrolytic solution, the cathode potential shifts to the less noble direction, and the crystals of deposits.

effect on the electrowinning in the acid leach method, the effect of Cd in the alkaline leach solution is found to be negligible. Lead can be separated quantitatively from the alkaline leach solu tion using sodium sulfide. Zinc Electrowinning Under Different Conditions In electrowinning of ultrafine zinc.

@inproceedings{SuInfluenceOL, title={Influence of lead impurity and manganese addition on main operating parameters of zinc electrowinning}, author={Chaoran Su}, year={} } table figure figure table figure table figure table figure table figure The effect of various zinc electrowinning solution impurities on the surface morphology of deposited zinc was investigated.

Impurities studied included al, ag, cd, CO, cr, cu, ge, mn, ni, sb, sn, ti, pbo2, pbso4, and hcl. Also, the effect of animal glue, gum arabic, and na2sio3 additives on the deposited zinc surface structure was studied.

In order to stabilise the conditions of electrolytic extraction of zinc in an acidic medium and in the presence of metal impurities, a surface-active compound containing a perfluoroalkyl group linked to a polyoxyethylene, amine oxide or betaine hydrophilic group is added to the electrolyte.

Effect of impurities and additives on the electrowinning of zinc / By Harold H. Fukubayashi, joint author. William C. Clinton and joint author. (Thomas J.) O'Keefe. Abstract. Includes of access: Internet Topics: Zinc. Considering the energy consumption and zinc deposit mass, a current density of Am-2 is recommended for zinc electrowinning.

The zinc electrowinning time. RESOURCE BOOK Introduction Electrowinning and smelting are the final stages of gold production. The concentrated gold solutions produced in the elution circuit (pregnant eluate and by the the metallic and other impurities into the slag phase, and produce a gold-silver bullion containing typically >95% precious metals.

The smelted. Summary This chapter contains sections titled: Introduction Effect of MagPower Additives in the Magnesium‐Air Fuel Cell Effect of MagPower Additives on the Zinc Electrowinning. Abstract The main goals in zinc electrowinning process are decreasing of power consumption and increasing of current efficiency.

In this study, the electrowinning of zinc in the presence of different additives in electrolyte were established and. Electrorefining is a much more common process than electrowinning and such plants additives are added to the electrolyte to enforce the correct behavior 28% zinc, and % impurities, led to extensive use of this alloy in ships.

This. A lead calcium tin alloy to which cobalt has been added is described. The alloy is useful in the formation of anodes to be used in electrowinning cells.

Electrowinning cells containing the cobalt alloys are particularly suited for electrowinning metals, such as copper, from sulfuric acid electrolytes.

The cobalt-containing anodes improve the efficiency of oxygen evolution at the anode during. The removal of cobalt from zinc electrolyte has been a focus of electrometallurgical research for over 20 years. This survey reviews the literature on cobalt cementation as well as zinc electrowinning and hydrogen evolution in the interest of characterizing the factors which are important in cobalt cementation by zinc dust and developing an improved purification process.

The basic method for the electrolyte zinc production is an electrowinning process based on sulfate solutions. The presence of the impurities in the electrolyte is a major problem for the zinc electrowinning industry.

Description Effect of Impurities and Additives on the Electrowinning of Zinc. PDF

They decrease the current efficiency, increase the energy consumption and deteriorate the quality of cathode deposited zinc. THE ROLE OF COPPER AND ANTIMONY ADDITIVES IN THE REMOVAL OF COBALT FROM ZINC SULPHATE SOLUTIONS: V. Van der Pas, D. Dreisinger, University of British Columbia, Department of Metals and Materials Engineering, Vancouver, British Columbia, V6T 1Z4 Canada Zinc sulphate electrolyte used for zinc electrowinning must be purified for cobalt ions.

The effects of calcination resulting in a solution with a high concentration of zinc and a low amount of impurit13 may also be processed directly in the zinc electrowinning process.

Details Effect of Impurities and Additives on the Electrowinning of Zinc. PDF

Zinc electrowinning is the final aqueous processing step in the production of metallic zinc. It is a complex process that is difficult to control and monitor. This thesis seeks to develop a time transient process simulation of zinc electrowinning to aid in controlling and monitoring.

Based on reported models of zinc electrowinning, and other electrowinning processes, a dynamic simulation of a. J. Lu, Effects of additives on nickel electrowinning from sulfate system. School of Chemical Engineering, Sichuan University, Chengdu China, Google Scholar; 7.

Z. Wei, The performance of lead anodes Used for zinc electrowinning and their effects on energy consumption and cathode impurities. Faculte des Sciences et de Genie. Universite Laval.Thus, the effect of electrowinning metals from waste leach solutions, possibly contaminated with organic solvent, was also investigated.

Lead Blast Furnace Slag Treatment Lead blast furnace slag, when treated by the Horsehead FLAME REACTOR process, generates an inert slag for disposal, and a zinc/lead/iron oxidized fume product.