NEW POSSIBILITIES OF 1-(2-PYRIDYLAZO)-2-NAPHTHOL FOR THE EXTRACTION OF PALLADIUM FROM NONFERROUS METALLURGICAL MATERIALS

The extraction of palladium from chloride solutions in the presence of ethylenediaminetetraacetic acid on a column packed with Teflon impreg nated with 1-(2-pyridylazo)-2-naphthol in isopentanol was studied as a function of the pH of the solution, the temperature of the column, an d the flow rate of the aqueous phase. The conditions were selected for quantitative (concentration factor 100) and relative (from 10(5)-fold excess of copper, (5 x 10(4))-fold excess of nickel, (1 x 10(3)-5 x 1 0(3))-fold excesses of lead, iron(III), calcium, magnesium, aluminum, manganese(II), and predominant quantities of other noble metals) extra ction. The procedure was used for determining palladium in anode coppe r, blister copper, regeneration copper, and Zh-3 ore.