3 edition of Selective nickel electrowinning from dilute electrolytes found in the catalog.
Selective nickel electrowinning from dilute electrolytes
Smith, Gerald R.
Bibliography: p. 20.
|Statement||by G.R. Smith, W.R. Thompson, and P.E. Richardson.|
|Series||Report of investigations / United States Department of the Interior, Bureau of Mines ;, 8749, Report of investigations (United States. Bureau of Mines) ;, 8749.|
|Contributions||Thompson, W. R. 1957-, Richardson, Paul E.|
|LC Classifications||TN23 .U43 no. 8749, TN799.N6 .U43 no. 8749|
|The Physical Object|
|Pagination||ii, 20 p. :|
|Number of Pages||20|
|LC Control Number||82600223|
Electrodialysis is a separation process for electrolytes based on the use of electric fields and ion selective membranes. Some common applications of the electrodialysis process are: Desalination of process streams, effluents, and drinking water; pH regulation in order to remove acids from, for example, fruit juices and wines. Nickel electrowinning from chloride electrolytes use divided cellswith the anode typically placed in a frame wrapped in a polyesterdiaphragm. The frame and diaphragm allows for chlorine capture. Nickel is commonly plated on starter sheets which had beengrown previously on titanium blanks for 1 to 2 days.
During electroplating of an article with nickel - (1) Name 1. The electrolyte 2. The cathode (2 electrolysis at 1. The cathode. 2. The anode. As shown in Figure Aa, the cobalt recovery process is based on the continuous selective oxidation and hydrolysis of cobalt from relatively impure nickel electrolyte. Cobalt-bearing slime, containing 8–10% Co, 28–34% Ni, –% Cu, and 5–6% Zn, is treated by selective reduction with sulfur dioxide to solubilize the cobalt and nickel to.
The standard fresh nickel sulfate solution used for the electrowinning experiments consisted of 70g NiSO 4 6H 2 O, (>98% Aldrich) added to distilled and deionized water to a total volume of 18L, to produce an initial concentration of M Ni 2+. g of Na 2 SO 4 (granular, >99% Aldrich) and g H 3 BO 3 (used to suppress hydrogen. The recovery of nickel using electrowinning has become more common in recent years owing to research and development. The reason for the difficulty with nickel is that the pH of the electrolyte (typically a sulfate media) will drop as the electrowinning process proceeds due to the electrode reaction (electrolysis) that produces hydrogen ions.
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Full text of "Selective nickel electrowinning from dilute electrolytes" See other formats RI Bureau of Mines Report of Investigations/ Selective Nickel Electrowinning From Dilute Electrolytes By G. Smith, W. Thompson, and P. Richardson UNITED STATES DEPARTMENT OF THE INTERIOR Report of Investigations Selective Nickel Electrowinning Selective nickel electrowinning from dilute electrolytes book Dilute Electrolytes.
Additional Physical Format: Online version: Smith, Gerald R., Selective nickel electrowinning from dilute electrolytes. [Avondale, Md.]: U.S. Dept. of the. Additional Physical Format: Print version: Smith, Gerald R., Selective nickel electrowinning from dilute electrolytes.
[Avondale, Md.]: U.S. Dept. of the. Selective electrowinning from dilute electrolytes was investigated by the Bureau of Mines.
A metal deposit containing 84 pct nickel was electrowon from the leach solution of a complex domestic ore bulk flotation concentrate originally containing approximately 2 wt-pct nickel.
Selective nickel electrowinning from dilute electrolytes / By Gerald R. Smith, Paul E. Richardson and W. (William Richard) Thompson Abstract. Electrowinning makes purer nickel than hydrogen reduction (described in Chapter 27).
Electrowinning is, however, labor and energy intensive. It will continue to be used for chloride and sulfate electrolytes where very high-purity nickel is required. Occupational exposure to dissolved nickel is likely to drive the choice of process in the future.
When nickel concentration increases in the copper sulphate electrolyte during electrolysis, it starts electrodepositing on the copper cathode thereby affecting the purity of the copper. In order to produce high quality copper cathodes with less than 1 ppm Ni, it became necessary to bleed-off large volumes of foul electrolyte contaminated with.
Cracking, curling, and the appearance of a second phase, an oxide Electrowinning of nickel from sulfate electrolytes or hydroxide, also accompanied the increase in electrolyte pH. A low pH value of could give a high quality deposit when both the temperature and nickel concentration were low, 40 and 40 g/l Ni2+, respectively, but the.
An electrowinning cell of novel design has been described by Treasure ().Named as EMEW R cell, it consists of a cylindrical in place of planar electrodes. The outer tube is the cathode and the inner one is anode. The diameters of the electrode tubes are sized according to the particular application to minimize cell voltage for a given solution chemistry.
Nickel electrowinning entails immersing metal cathodes and anodes in an aqueous nickel electrolyte; and applying a DC electrical potential between these anodes and cathodes. The electrolyte resistance refers to the electrical resistance that the electrolyte offers.
ELECTROWINNING OF COPPER AND NICKEL FOR THE PROCESSING OF SEA NODULES Vinay Kumar, D. Bagchi, B.D. Pandey, R.K. Jana and Premchand bed pH of the nickel spent electrolyte, the selective nickel stripping could be achieved with minimum contamination of copper.
A flow sheet ammonium bicarbonate and dilute sulphuric acid in two stages each. Modern nickel electrowinning from sulfate electrolytes is beset by several processing challenges.
This includes the need to operate a covered divided cell to minimize nickel mist emissions and. Nickel, which remained in the aqueous phase, was concentrated by Cyanex and then stripped by synthetic nickel spent electrolyte in order to produce a solution suitable for nickel electrowinning.
The process efficiency and product quality of nickel produced by electrowinning are highly dependent on electrowinning bath conditions, electrolyte concentrations, electrical operating parameters. Sodium sulphate in the electrolyte acts as a smoothing agent there are a few things that need to be controlled for nickel electrowinning.
You can see below that SX with Cyanex is very. Compatibility of nickel electrolyte containing sodium sulfate with a solvent extraction system / ([Avondale, Md.]: United States Dept. of the Interior, Bureau of Mines, ), by Ruth A.
Holmes, R. Siemens, and D. Nilsen (page images at HathiTrust). Electrolyte Solutions In the last few chapters of this book, we will deal with several speci c types of chemical systems. The rst one is solutions and equilibria involving electrolytes, which we will take up in this chapter.
The thermodynamics of electrolyte so-lutions is important for a large number of chemical systems, such as acid-base. Hydrometallurgy proudly takes its place as the most up-to-date, comprehensive book published in this field. Following the tradition of the previous international symposiums, this resource tackles the newest in primary and secondary resource recovery with sections on environmental hydrometallurgy, research and industrial applications, base and precious metals, and leaching.
The optimal time for nickel electrowinning was determined in the same manner as for copper. The optimal times and maximum net CEP removal rates for nickel were min, g min −1, and min, g min −1 for 20A and 15A, respectively, and min. for cadmium at 20A. QUESTIONS ON ELECTROWINNING.
Remco Engineering question on electrowinning treatment. A low voltage direct current is applied through the solution and metal ions are reduced at the cathode and If the proper segregation is used, little or no maintenance is required between loads except for monitoring the operation.
Gold is plated at very high pH. Nickel electrowinning from chloride electrolytes is an innovative and efficient process developed and commercialized mainly by Falconbridge Ltd. Several fundamental aspects related to this process have been addressed in this thesis, including the thermodynamic study of nickel electrolytes, the measurement and modelling of the cathode surface pH during nickel electrowinning and the kinetic.8) Removal of As, Sb and Bi via electrowinning them onto an impure Cu deposit.
9) Evaporation of water and precipitation of Ni, Fe and Co as sulfides. • Table Typical electrolyte conditions for copper electrorefining Figure summarizes the total process. Normally, the sludge removal is by.The experimental results demonstrate that nickel, cobalt and iron(II) can be separated easily from magnesium via selective extraction using 20% Versatic 10 as extractant and 5% tri-n-butyl.