Method for preparing rhodium trichloride hydrate by using silica gel-polyamine resin

The invention relates to a method for preparing rhodium trichloride hydrate by using silica gel-polyamine resin. The method comprises the following steps: adding water to dilute a rhodium acid digestion solution obtained after digestion of rhodium residues by concentrated sulfuric acid and nitric acid, adding a sodium chloride solid, and heating to reflux the obtained solution; allowing the solution to go through an exchange column filled with silica gel-polyamine resin; and sequentially eluting a small amount of sodium, iron, calcium, nickel and other metals residual in the column and adsorbed to the resin by using deionized water and 1-6mol/L of a hydrochloric acid solution, eluting rhodium adsorbed to the resin by using 6-12mol/L of 50-90DEG C hydrochloric acid, and evaporating the eluted chlororhodic acid solution to obtain the rhodium trichloride hydrate. In the rhodium acid digestion solution, the rhodium content is 1-10wt%, the nitrate content is 1-5wt%, and the sulfuric acid content is 30-85wt%; a molar ratio of sodium chloride to rhodium in the digestion solution is 3-15; and the silica gel-polyamine resin is water soluble polyurethane, and is combined to resin formed on the surface of a silica gel carrier in a covalent bond mode. The method for preparing rhodium trichloride hydrate from the rhodium acid digestion solution has the characteristics of high recovery efficiency, simple process, mild process conditions and the like.