METHOD FOR SOLIDIFYING AND STABILIZING A CONCENTRATED AQUEOUS SODIUM HYDROXIDE SOLUTION

摘要

The invention concerns a method for solidifying and stabilizing a concentrated aqueous sodium hydroxide solution, characterized in that it includes the following steps: a) mixing with said sodium hydroxide solution, a hydraulic binder containing blast-furnace slag, in the presence of at least one additional source of calcium ions and/or magnesium ions and/or silica to form a slurry; b) allowing the slurry to cake to obtain a solid product. The invention also concerns the solid product obtained by implementing the inventive method. The invention is applicable to the treatment of radioactive sodium hydroxide solutions or contaminated by other pollutants.