Fixant and matrix for fixing toxic organic compounds in waste ma

Details Fixant and matrix for fixing toxic organic compounds in waste ma Fixant and matrix for fixing toxic organic compounds in waste ma

1991-10-25

1994-12-27

Wyse, Thomas

Liquid purification or separation

Processes

Chemical treatment

106697, 106714, 106718, 106DIG4, 588252, 588257, C04B 2802, C02F 152

Patent

active

053762835

ABSTRACT:
A fixant for fixing toxic organic compounds comprised in waste material comprising an inorganic binder based on calcium compounds mixed with an alumino silicate, and at least one metal sulphate which fixes said organic compounds and counteracts leaching, is disclosed. Preferably a combination of several metal sulphates, especially aluminum sulphate, manganese sulphate and ferric sulphate is used. Moreover, the fixant preferably comprises an organo-clay compound, in particular a bentonite, a montmorillonite and a hectorite.
A process of treating waste material comprising toxic organic compounds by mixing said waste material with said fixant, as well as a matrix formed from at least a set inorganic binder based on a cement and a silicate with environmentally harmful organic compounds containing waste material encapsulated therein, said matrix also comprising at least one metal sulphate which fixes said organic compounds and counteracts leaching is disclosed.

REFERENCES:
patent: 3720609 (1973-03-01), Smith et al.
patent: 4124405 (1978-11-01), Quienot
patent: 4142912 (1979-03-01), Young
patent: 4209335 (1980-06-01), Katayama et al.
patent: 4615809 (1986-10-01), King
patent: 4822496 (1989-04-01), Griffiths et al.
patent: 4855083 (1989-08-01), Kagawa et al.
patent: 4861709 (1989-08-01), Watanabe et al.
patent: 5304709 (1994-04-01), Babcock et al.

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