<Original Papers>Separation of Metals by Extraction with High Molecular Weight Amines

The separation of metals related closely to the hydrometallurgical processes was studied with the aid of liquid anion exchangers. The extraction behaviors were studied on the following substances : copper, cobalt, nickel, lead, iron, zinc, cadmium, bismuth and gallium in hydrochloric acid solutions, and platinum, paladium and rhodium in hydrochloric and hydrobromic acid solutions. Three kinds of amines, i.e., Amberlite LA-2,Trilaurylamine, and Cyclohexyldidodecylamine, were employed in the form of 0.1 mole kerosine solutions. The results obtained are summarized in Figs.1 to 4. The extraction depends largely on the acid concentration of the aqueous solution. Appropriate arrangement of acid concentration may lead to a possibility of individual separation of metals. In general, the third class amines show the stronger extracting trend than the second class amines. Metals extracted in organic phases were easily stripped with 0.5N nitric or sodium citric acid aqueous solutions, except the metals of platinum group