A - Human Necessities – 62 – D
Patent
A - Human Necessities
62
D
A62D 3/33 (2007.01) C04B 7/19 (2006.01) C04B 28/02 (2006.01) C04B 28/08 (2006.01) A62D 3/00 (2006.01)
Patent
CA 2131348
ABSTRACT OF THE DISCLOSURE A method for immobilizing material contaminated with heavy metal ions, a fixant for immobilizing heavy metal ions and a matrix. A method is disclosed for immobilizing material contaminated with heavy metal ions, said metal ions in a liquid environment being allowed to react with a metal- complexing agent with the formation of a metal complex, the metal-complex formed being mixed, in the presence of water, with an inorganic, hydraulic binder comprising blast furnace slag cement, fly ash cement or a combination thereof to form a matrix having reductive properties in the form of a hard, rocklike material, which method is characterized in that said metal complex is formed in the presence of a metal-complex bond activator. Said metal- complex bond activator is preferably a water-soluble salt of a transition metal element, expediently ferric chloride or manganese sulphate. The invention also relates to a fixant for immobilizing heavy metal ions comprised in waste material, and to a matrix to be formed from a material contaminated with heavy metal ions.
Moffat & Co.
Pelt & Hooykaas B.v.
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