| 摘要 |
<p>1358644 Separating iridium from rhodium W C HERAEUS GmbH 24 Aug 1972 [3 Sept 1971] 39562/72 Heading C1A [Also in Division C2] Iridium (IV) as an Ir(IV) complex is separated from an aqueous mineral acid solution which contains both iridium (IV) and rhodium (III) values by reacting the solution with a tri-n-alkyl ammonium or tri-iso alkyl ammonium halide to form a complex with the iridium (IV) which is extracted by contacting with an aliphatic or aromatic halohydrocarbon, a carboxylic acid ester or an alcohol which is sparingly soluble in water. The example illustrates the extraction of iridium from an aqueous hydrochloric acid solution by complexing with tri-nbutyl ammonium chloride and extraction with methylene chloride. The mineral acid solution may contain cobalt and/or nickel as well as iridium and rhodium and in this case up to 10 vol. per cent of nitric or nitrous acid may be added to the solution.</p> |
