Method for the inertisation of heavy metals such as hexavalent chromium, chlorides and other salt-forming compounds and soluble solids and metallic contaminations

摘要

The method comprises carbonating inorganic matrix components and then performing combustion or thermal, chemical and/or mechanical calcination process using a hot flue gas having carbon dioxide as a heating medium, adjusting temperature of the hot flue gas to 200-500[deg] C, adding additives to waste/ash in the matrix components to thermally decompose to urea and carbonates during calcination process and to release carbon dioxide, and performing wet chemical treatment and granulation with respect to the optimum mass transfer at a high carbonation speed before the calcination. The method comprises carbonating inorganic matrix components and then performing combustion or thermal, chemical and/or mechanical calcination process using a hot flue gas having carbon dioxide as a heating medium, adjusting temperature of the hot flue gas to 200-500[deg] C, adding additives to waste/ash in the matrix components to thermally decompose to urea and carbonates during calcination process and to release carbon dioxide, and performing wet chemical treatment and granulation with respect to the optimum mass transfer at a high carbonation speed before the calcination. A degree of carbonization of product is oriented from calcination at the optimum of the lowest solubility of contaminants using heavy metals including hexavalent chromium, chlorides and other salt-forming agents, soluble solids and metallic contaminants, and a pH is 8-12.