METHOD FOR OBTAINING A GEOPOLYMER BINDER ALLOWING TO STABILIZE, SOLIDIFY AND CONSOLIDATE TOXIC OR WASTE MATERIALS

摘要

2072638 9204298 The process described in the invention makes it possible to obtain a powdered geopolymeric binder, used for the ultra-rapid treatment of materials, soils or mine dumps, containing toxic waste. Said geopolymeric binder has a setting time equal to or greater than 30 minutes at a temperature of 20 · C and a hardening speed allowing to obtain compressive strengths (Rc) equal to or greater than 15 MPa, after only 4 hours at 20 · C, when tested according to the standard standard applied to hydraulic binder mortars with a binder / sand ratio equal to 0.38 and a water / binder ratio between 0.22 and 0.27. The preparation process includes the following three reactive elements: a) an aluminum silicate oxide (Si2O5, Al2O2) having the cation Al in coordination (IV-V); b) an alkaline disilicate, of sodium and / or potassium, (Na2, K2) (H3SiO4) 2; c) a calcium silicate; the molar ratios between the three reactive elements are equal or between (Na2, K2) (H3SiO4) 2 / (Si2O5, Al2O2) = 0.40 and 0.60, Ca ++ / (Si2O5, Al2O2) = 0.60 and 0 , 40 such that (Na2, K2) (H3SiO4) 2 + Ca ++ / (Si2O5, Al2O2) = 1.0 with Ca ++ denoting the calcium ion belonging to a weakly basic calcium silicate whose atomic ratio Ca / Si is less than 1.