Cementitious encapsulation of waste materials and/or contaminate

Hazardous or toxic waste destruction or containment – Containment – Solidification – vitrification – or cementation

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Details

405129, 405266, B09B 300, E02D 312

Patent

active

052762556

ABSTRACT:
The present invention relates to the cementitious encapsulation of waste materials and/or contaminated soils containing heavy metals, to render them immobile, and particularly to the immobilization of metals, in regulated amounts, in such wastes. A waste product comprising the metals is provided. A mixture is prepared comprising said wastes and/or contaminated soils containing heavy metals, water, and a cementitious composition. The cementitious composition comprises magnesium oxide and magnesium chloride in proportions effective to produce, with said water, a magnesium oxychloride cement. The cementitious composition is present in an amount which, on setting, is effective to immobilize the metals in said waste and/or contaminated soils. The mixture of waste and/or contaminated soils and cementitious composition is introduced to a disposition site, and allowed to set and harden at said site. The present invention is particularly useful for the remedial treatment of landfill sites.

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patent: 3980558 (1976-09-01), Thompson
patent: 4004428 (1977-01-01), Tazawa et al.
patent: 4132558 (1979-01-01), Uchikawa et al.
patent: 4142912 (1979-03-01), Young
patent: 4149968 (1979-04-01), Kupiec et al.
patent: 4336069 (1982-06-01), Dodson et al.
patent: 4432666 (1984-02-01), Frey et al.
patent: 4701222 (1987-10-01), Kobayashi et al.

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