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

Abstract

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.