A method of getting reusable electrolyte from Electrochemical Machining of parts made up of nickel, iron and chromium, characterized by comprising: - a first step of reducing the chromate content of the Electrochemical Machining electrolyte in a first reactor, by: - agitating a biphasic heterogeneous mixture of: - aqueous electrolyte purges from the Electrochemical Machining facility of parts made up of nickel, iron and chromium, together with - an organic solution, whose solvent is a water-insoluble blend of benzyl alcohol and an extractant selected from aromatic, poly-amyl-phosphate or poly-alkyl-phosphate compounds, and whose solute is a mixture of oxalic acid, as an activator, and a strong acid selected from nitric acid or hydrochloric acid, in concentrations not higher than 5x10 -3 M and 10 -4 M respectively, - putting at rest the biphasic heterogeneous mixture obtained so that the aqueous electrolyte settles down to the bottom of the first reactor, dragging oxalato-chromate complexes inherent to chromate reduction in presence of oxalic acid, whereas most of the benzaldehyde and benzoic acid produced by the oxidation of benzyl alcohol remain in the upper organic phase, - a second step of alkalinisation, in which the aqueous electrolyte dragging oxalato-chromate complexes of the first reactor, is mixed in a second reactor with a solution of a strong base from the group selected from alkaline hydroxides, alkaline-earth oxides, alkaline-earth hydroxides, alkaline carbonates and alkaline-earth carbonates or mixtures thereof, until oxalato-chromate complexes are transformed to chromium hydroxide and insoluble oxalates, getting reusable electrolyte with steady concentrations of chromate ion below 500 ppm - a first step of reducing the chromate content of the Electrochemical Machining electrolyte in a first reactor, by: - agitating a biphasic heterogeneous mixture of: - aqueous electrolyte purges from the Electrochemical Machining facility of parts made up of nickel, iron and chromium, together with - an organic solution, whose solvent is a water-insoluble blend of benzyl alcohol and an extractant selected from aromatic, poly-amyl-phosphate or poly-alkyl-phosphate compounds, and whose solute is a mixture of oxalic acid, as an activator, and a strong acid selected from nitric acid or hydrochloric acid, in concentrations not higher than 5x10 -3 M and 10 -4 M respectively, - putting at rest the biphasic heterogeneous mixture obtained so that the aqueous electrolyte settles down to the bottom of the first reactor, dragging oxalato-chromate complexes inherent to chromate reduction in presence of oxalic acid, whereas most of the benzaldehyde and benzoic acid produced by the oxidation of benzyl alcohol remain in the upper organic phase, - agitating a biphasic heterogeneous mixture of: - aqueous electrolyte purges from the Electrochemical Machining facility of parts made up of nickel, iron and chromium, together with - an organic solution, whose solvent is a water-insoluble blend of benzyl alcohol and an extractant selected from aromatic, poly-amyl-phosphate or poly-alkyl-phosphate compounds, and whose solute is a mixture of oxalic acid, as an activator, and a strong acid selected from nitric acid or hydrochloric acid, in concentrations not higher than 5x10 -3 M and 10 -4 M respectively, - aqueous electrolyte purges from the Electrochemical Machining facility of parts made up of nickel, iron and chromium, together with - an organic solution, whose solvent is a water-insoluble blend of benzyl alcohol and an extractant selected from aromatic, poly-amyl-phosphate or poly-alkyl-phosphate compounds, and whose solute is a mixture of oxalic acid, as an activator, and a strong acid selected from nitric acid or hydrochloric acid, in concentrations not higher than 5x10 -3 M and 10 -4 M respectively, - putting at rest the biphasic heterogeneous mixture obtained so that the aqueous electrolyte settles down to the bottom of the first reactor, dragging oxalato-chromate complexes inherent to chromate reduction in presence of oxalic acid, whereas most of the benzaldehyde and benzoic acid produced by the oxidation of benzyl alcohol remain in the upper organic phase, - a second step of alkalinisation, in which the aqueous electrolyte dragging oxalato-chromate complexes of the first reactor, is mixed in a second reactor with a solution of a strong base from the group selected from alkaline hydroxides, alkaline-earth oxides, alkaline-earth hydroxides, alkaline carbonates and alkaline-earth carbonates or mixtures thereof, until oxalato-chromate complexes are transformed to chromium hydroxide and insoluble oxalates, getting reusable electrolyte with steady concentrations of chromate ion below 500 ppm