Patent ID: 9072926
Filing Date: 2015-07-07
Classification: A62D,B09B,C02F,G21F

Abstract:
1. A method for stabilizing and immobilizing hazardous waste, comprising steps of i) providing ash after burning oil shale (shale ash); ii) providing hazardous waste to be stabilized and mixing it with said shale ash wherein said ash is added in an amount of between 0.5 and 1.35 weight parts per one weight part of said waste, and further with an alkaline component selected from Portland cement, slag cement, clinker, sodium silicates, sodium carbonates, alkali metal hydroxides, and alkaline earth metal hydroxides in an amount of between 0.05 and 0.15 weight parts per one weight part of said waste, and optionally with water in an amount not greater than necessary for obtaining a blendable paste, thereby obtaining a homogenized mixture; and iii) transferring said mixture to a site of landfill and allowing it to harden; thereby obtaining a stabilized waste safely embedded in a hardened matter exhibiting after seven days a compression strength of at least 1 MPa.