35 results about "Stepwise elution" patented technology

The invention belongs to the technical field of resource recovery, and discloses a method for stepwise recovering aluminum, iron and gallium from an aluminum chloride solution by using anion exchange resin. The method comprises the following steps: contacting an aluminum chloride solution with anion exchange resin, and adsorbing to obtain saturated anion exchange resin; the method comprises the following steps: contacting a desorption agent I with adsorption-saturated anion exchange resin, carrying out first desorption, and separating to obtain anion exchange resin subjected to first desorption and an aluminum-rich desorption solution; contacting a desorption agent II with the anion exchange resin subjected to the first desorption, carrying out second desorption, and separating to obtain anion exchange resin subjected to the second desorption and an iron-rich desorption solution; and contacting a desorption agent III with the anion exchange resin subjected to the second desorption, carrying out third desorption, and separating to obtain the anion exchange resin subjected to the third desorption and a gallium-rich desorption solution. According to the method, aluminum ions, iron ions and gallium ions adsorbed on anion resin are selectively separated through gradient analysis, and gallium and iron metal resources can be recycled.