| 摘要 |
<p>Metal values are extracted from an aqueous medium containing the value in solution or suspension by contacting with a solution of naphthenic acid in an inert organic solvent immiscible with the aqueous medium. The aqueous medium is at a pH not more than 0,5 below the hydrolysis pH of the metal to be extracted. Preferential extraction from a mixture of two metal values may also be made by choosing the appropriate hydrolysis pH value. Solvents such as benzene, toluene, xylene, white spirit or preferably kerosene may be used and the metal values are stripped by acidification with dilute mineral acids, e.g. sulphuric acid. Co-current and counter-current processes are used and examples describe the separation of copper, copper and iron, copper and cobalt, and copper and nickel.ALSO:Naphthenates of metals, e.g. copper, cobalt, nickel, iron, zinc, manganese and calcium, are used in a process for the extraction of metal values from an aqueous medium containing the value in solution or suspension. The values are contacted with a solution of naphthenic acid in an inert organic solvent such as benzene, toluene, xylene, white spirit and preferably kerosene. The metals are stripped from the resulting solution by acidification with dilute mineral acids. Examples describe the separation of copper, copper and iron, copper and cobalt, and copper and nickel.</p> |
