Lime recovery system for fly ash containing waste from combustion gas cleaning, achieving the inertization of these

摘要

The invention relates to the extraction of lime from the fly ash and the residues from purification of the combustion gases, which as a result are transformed into an inert waste. A first stage includes carbonation with CO2 in water, obtaining (a solution with (Ca (CO3 H)2), soluble salts and heavy metals) and ashes from which iron oxides are extracted magnetically with complex heavy metals. A second stage, decarbonation, in which CaCO3 precipitate is obtained and a saline solution is processed in an E.D.R, resulting in heavy metal hydroxides and treated water. CO2 and process water are recovered and reused. The CaCO3 is valued for reuse in the purification of combustion gases. It is possible to obtain ashes with a very low leachable profile, which fall into the classification of inert waste. There is a residue of heavy and ferrous metals as a manageable waste. (Machine-translation by Google Translate, not legally binding)