Loading patent…
AssigneeSociete Internationale de Publicite et d'Agences Commerciales
InventorsSerge H. Rysman de Lockerente, Norbert Van de Voorde
Estimating the term…
Process for the irreversible treatment of toxic waste by means of a silicate, in the presence of water, in such a way as to form a solid aggregate includes treatment of the silicate in an acid medium, for the purpose of obtaining silicic acid of low molecular weight; mixing the silicic acid with the waste to be treated, in the presence of water and controlling the pH between 0 and 4 in a sufficiently acid medium to cause the waste to undergo at least partial solution; precipitation of a gel of high molecular weight from the resultant aqueous mixture; addition thereto of a mixture which reacts with the gel of high molecular weight to form a silicate, possibly in the presence of a cementation agent, in such a way as to produce a sludge, and the hardening of the sludge into a solid aggregate which can not be changed physically so as to release again the harmful or toxic waste into the environment.
A process for the formation of a chemically stable solid aggregate of wastes containing at least one heavy metal or heavy metal compound which is at least partially water soluble under acid conditions comprising the sequential steps of:
Dependencies are inferred from the claim text.