Abstract: To solve the complex separation of nickel leaching solution, the authors studied the adsorption performance of iminodiacetic acid resin for nickel and magnesium, and investigated the models of the adsorption of iminodiacetic acid resin for nickel and magnesium, and also the effect of the resin dosage, solution pH, nickel initial concentration, adsorption time, nickel-iron ratio on the resin adsorption amount and the separation coefficient of nickel from iron. The results indicate that the adsorption of magnesium onto D401 resin follows Langmuir model and Freudlich model and involves monolayer and double layer adsorption patterns. But nickel adsorption does not follow the above two models. The initial concentration and pH of solution are the main process factors influencing the adsorption. The best process conditions are C_Ni =0.5 g/L, pH=4, Mg］/［Ni］=3:1. At a resin dosage of 50 mL, the adsorption amount is larger and the separation coefficient of nickel from magnesium is evidently raised. Without acid cleaning and alkaline cleaning, the resin adsorption is larger and the separation coefficient higher.

Key words: Adsorption, Iminodiacetic Acid Resin, Nickel, Magnesium, Ion exchange