Method of inhibiting degradation of DSX extractant by auxiliary means

A method of inhibiting degradation of an extractant in a DSX (synergistic solvent extraction) process, the method comprising the steps of:

• (a) adjusting a ratio of an extractant to a diluent in the DSX solvent to adjust a concentration of the extractant in the DSX solvent to a certain range;
• (b) extracting a metal contained in a pregnant leached solution from a mixture of the DSX solvent and a pregnant leached solution contained in a settler by adjusting a ratio of the, wherein the mixture is contained in a settler and separated into an aqueous phase solution and an organic phase solvent containing an extracted metal;
• (c) measuring pH of the aqueous phase solution;
• (d) adding soda ash (Na2CO3) to the aqueous phase solution to control the measured pH of the aqueous phase solution to be in a range of pH3 to pH7;
• and
• (e) scrubbing with a scrubbing solution having a zinc concentration of 2 g/L to 20 g/L by zinc sulfate (ZnSO4) in order to remove manganese from the organic phase solvent containing the extracted metal.