Method and device for regeneration of hydrochloric acid

Method to extract or recover hydrochloric acid from hydrochloric acid solutions containing metal by means of spray roasting followed by one or both of absorption and condensation of gaseous hydrogen chloride thus formed in order to form hydrochloric acid, comprising

• providing an initial flow of hydrochloric acid solution containing metal;
• splitting the flow of the hydrochloric acid solution containing metal into a first partial flow and a second partial flow of hydrochloric acid solution containing metal;
• feeding the first partial flow of hydrochloric acid solution containing metal to a spray roaster to undergo pyrohydrolytic treatment, which releases gases;
• directly contacting the gases released from the pyrohydrolytic treatment with the hydrochloric acid solution containing metal, thereby cooling the gases released from the pyrohydrolytic treatment and concentrating the hydrochloric acid solution containing metal;
• feeding the second partial flow of hydrochloric acid solution containing metal directly to an absorption column without undergoing pyrohydrolytic treatment, thereby increasing a concentration of metal in the hydrochloric acid solution containing metal, wherein
• at least one of the initial flow or the first partial flow of hydrochloric acid solution containing metal is concentrated by evaporation such that the first partial flow of hydrochloric acid solution containing metal fed to the spray roaster for pyrohydrolytic treatment is a concentrated solution.