Experiment on selective dynamic extraction of germanium by ultrasonic enhanced N235 extraction resin under complex system

•Enhanced multi-stage extraction using ultrasound.•14.4 % increase in extraction rate with ultrasound enhancement.•Germanium in complex systems using N235 extraction resin.•Extraction rate of 85.23 % after five repeated regenerations of N235 extraction resin.•The application of ultrasound significantly improves mass transfer and diffusion processes and can reduce extraction times.•Dynamic extraction of germanium can reduce the use of the site and manual operation, effectively avoid the leakage of waste acid or reagents in the production process, so as to avoid pollution to the environment. Germanium plays an irreplaceable role in the field of modern high-tech materials and is an important strategic metal resource. N235 extraction resin was used to selectively extract [Ge(C4O6H4)3]2-. Under the condition of ultrasonic power at 120 W in a water bath, the extraction rate of germanium was 97.32 %. The extraction rate of zinc was 2.37 % under the conditions of a three-stage solid phase extraction column in series (single-stage filling N235 extraction resin 0.8 g), reaction temperature 25 °C, tartaric acid concentration of 2.0 g/L, and the dwell time is 4.1min. The saturated adsorption capacity of the resin is 51.90 mg/g. The extraction rate of germanium increased by 14.4 % under ultrasonic-assisted strengthening conditions. The [Ge(C4O6H4)3]2- can be separated from the resin by NaOH solution. The desorption rate of germanium was 94.12 % under the condition of water bath ultrasonic power of 120W, 30 ml concentration of 3.5 mol/L NaOH solution, and the dwell time is 5.2min. Under the optimum conditions, the extraction rate of N235 extraction resin was 85.23 % after repeated regeneration five times. The results demonstrate that the extraction resin exhibits high selectivity and reproducibility in complex systems, presenting a new method for extracting germanium under complex conditions. [Display omitted]