Extraction of precious metals by surface-active substances

It was studied extraction of precious metals and another elements from some acids by 2,2-di-{(1,6,7-3-hydroxifenilen)} and poly-{( 2,2-di[(1, 6, 7-3-hydroxy-5-isopropyl-3-methyl-naftil-8-metiliden)-(1-amino-2-carboxifenilen-6-methylenoxiglicol)]-4-il}-methilen. Extraction of palladium from weak acid solutions by first reactant is good (DPd=15,6; E=95%). DPd raise in connection with first reactant concentration increasing (0,4%). From sulphuric acid with DPd=10, Pd is extracted by second reactant. Extraction of Os, Ru, Ag, Au, Pt, Cu, Zn, Ni is weak. Ir, Re, Co, W, Fe are not extracted. It has been worked out a separation method of Pd from Pt with the second reactant. The method has been tested in some artificial mixtures of platinum metals. (author). 2 refs.; 3 tabs