Precipitate flotation I. Removal of nickel from dilute aqueous solutions and its separation from cobalt

✍ Scribed by Mahne, E. J.; Pinfold, T. A.

• Book ID: 119992265
• Publisher: Wiley (John Wiley & Sons)
• Year: 2007
• Weight: 333 KB
• Volume: 18
• Category: Article
• ISSN: 0021-8871
• DOI: 10.1002/jctb.5010180205

✦ Synopsis

A new technique, called precipitate flotation of the second kind, in which no surfactant is used to float precipitates, is described. Nickel is completely removed from 1.5 x M-NiCI, solutions in 3 minutes using a tenfold excess of nioxime. Flotation improves with increasing temperature between 21" and 40" if the pH is in the range 8-11. Increase in ionic strength has no deleterious effect, unlike conventional precipitate flotation. Nickel can be completely separated from a hundredfold excess of cobalt by complexing the latter with nitroso-R-salt before flotation. Iron does not float on its own but recoveries of 50% can be achieved by entrainment of ferric hydroxide in nickel nioximate.