[en] The method of radioactive indicators was used to study solvent extraction of macro amounts of rhenium (7) by cyclohexanone from sulfuric acid solutions, containing rhenium (7) and tungsten (6). The extraction of trace amounts (10^-7-10^-3 mass%) of Be, Ca, Ti, V, Cr, Mn, Fe, Co, Ni, Zn, As, Sr, Y, Zr, Nb, Ru, Cd, In, Sn, Sb, Te, Cs, Ce, Hg, Tl was also studied under conditions for rhenium separation. All the elements except for Ti, Ru and Hg, were practically completely separated from rhenium and concentrated in the aqueous phase. The results obtained can be used to develop a method of extraction-atomic-emission determination of trace elements in tungsten-rhenium alloys