Recycling method of waste hydrochloric acid containing aluminum

The invention discloses a recycling method of waste hydrochloric acid containing aluminum and belongs to the technical field of recycling of waste acid containing aluminum. The method comprises the following steps of: (A) carrying out sand filtration on a waste hydrochloric acid washing liquid of an aluminum casting to remove suspended matters; (B) passing the waste hydrochloric acid washing liquid without the suspended matters through a fixed bed adsorption tower which is filled with strong-alkali anion exchange resin and provided with a heat insulation jacket under the conditions that the temperature is 5-45 DEG C and the work flow is 0.5-3.0BV/h; C) adding industrial hydrochloric acid in the processed effluent liquid so that the concentration of HCl is increased to 8mol/L, and then returning the effluent liquid back to a production process to be used as an aluminum casting hydrochloric acid washing liquid for circulating use; and D) passing distilled water or deionized water which is used as a regenerating agent through a resin bed to exchange and elute aluminum complex anions on a strong-alkali anion exchange resin, so as to form an aqueous solution containing aluminum trichloride, wherein the aqueous solution containing aluminum trichloride can be directly used as a purifying agent byproduct. According to the invention, the strong-alkali anion exchange resin is applied to the treatment and resource recovery of the waste hydrochloric acid washing liquid of the aluminum casting, thereby achieving the zero emission of the waste hydrochloric acid washing liquid of the aluminum casting and realizing the complete recycling of hydrochloric acid.