PROCESS AND INSTALLATION FOR THE RECOVERY OF PHOSPHORUS FROM WASTE INCINERATION ASH

摘要

The present invention envisages a method for the recovery of phosphorus from waste incineration ash comprising a) a step of digesting the ashes with a 20-40% sulfuric acid solution, making a first solid phase and a first liquid phase, b) a step of continuously separating, without energy consumption, of the liquid and solid phases, c) a step of chemical precipitating, thermally coupled to the digesting of the ashes of step a), of the phosphate ions of the first liquid phase, by means of the addition of lime, until reaching a pH of 4.0-4.5, obtaining a second liquid phase, rich in acid, and a second solid phase, made up of phosphates and sulfates and d) a step of continuously separating, without energy consumption, of the second liquid and solid phase, the latter being the final product. Likewise, the installation for carrying out said method is envisaged.