39 results about "Metal poisoning" patented technology

The invention discloses a regeneration method of a molybdenum removal extraction agent for a waste acid system, and belongs to the technical field of extraction agent regeneration. The method comprises the following steps: adding 0.05-0.1 wt.% of polybasic carboxylate, organic phosphonate or hydroxy carboxylate complexing agent into a 5-8wt.% carbonate buffer system, mixing a water phase and an aging extraction agent according to a phase ratio O / A of 1: 1, reacting at 20-35 DEG C for 8-12 minutes, and separating an organic phase from a weak base phase. And washing the organic phase with 0.5-1.0 mol / L sulfuric acid according to a phase ratio O / A of 1: 1, separating, washing with water, and separating the organic phase from the water phase again. And dehydrating the organic phase until the water content is less than or equal to 150ppm, contacting the organic phase with a pre-equilibrium liquid containing sulfuric acid and / or sulfate according to a phase ratio O / A of 1: 1, so that the acid value of the organic phase is 0.10-0.35 mg KOH / g, and recovering the addition ratio of TBP.H2SO4 to 0.05-0.20 mol / mol. Adding 50-200ppm of hindered phenol antioxidant into the organic phase, filtering, and then sealing and aging at room temperature; the regenerated extraction agent has the advantages of low water content, stable acid value, improved interfacial tension, elimination of metal poisoning, good phase behavior, extraction capacity recovery degree of more than 90%, stable long-term cycle performance, and no generation of emulsification and third phase.