Method for synergistically extracting nickel from nickel plating wastewater

The invention discloses a method for synergistically extracting nickel from nickel plating wastewater, which relates to the technical field of wastewater treatment, and comprises the following steps: S1, preparing a D2EHPA solution, adding alkali liquor into the D2EHPA solution, stirring to enable the saponification rate of D2EHPA to be 30-70%, layering the reaction solution, and taking the upper-layer reaction solution; S2, adding a diluent into the upper-layer reaction liquid; S3, continuing to add methyl isobutyl ketone to obtain an extracting agent; S4, adding an extracting agent into the nickel plating wastewater, uniformly stirring and mixing, layering the reacted solution, and taking the upper solution; and S5, adding an acid solution into the upper-layer solution for back extraction to obtain a nickel-containing recovered material. The method has the beneficial effects that the D2EHPA solution and the methylisobutylketone solution are adopted to synergistically extract nickel ions in the nickel platin