Hazardous or toxic waste destruction or containment – Containment – Solidification – vitrification – or cementation
Patent
1994-05-06
1995-12-19
Taylor, Dennis L.
Hazardous or toxic waste destruction or containment
Containment
Solidification, vitrification, or cementation
209 17, 588249, 405128, A62D 300, B09B 300
Patent
active
054769949
ABSTRACT:
The process for removal of metal-contaminated sediment includes dredging the sediment and removing large objects from the sediment, then removing smaller objects such as shell fragments with a first course screen. The remaining sediment slurry is processed through at least two screens covering a range of mesh sizes to separate the solids into three size/mesh fractions. Water extracted during the separation is processed through a series of hydrocyclones to separate any remaining solids and to allow the water to be recycled. The largest fraction of solids, the "sand fraction" has a low concentration of the metal and requires no further processing. The smallest fraction, which has passed through a mesh corresponding to the size of the most basic form of the metal ore, enters a screw classifier for dewatering after which it is appropriate for direct smelter recycling. The mid-size fraction, while still containing elevated levels of the metal which make it unsuitable for land-based use, does not contain sufficient concentrations for direct smelter recycling. This fraction is passed through a chemical extraction system to create a soluble metal salt from which a precipitate is formed which is then suitable for smelting.
REFERENCES:
patent: 2330479 (1943-09-01), Erickson
patent: 2968524 (1961-01-01), Seeton
patent: 3720380 (1973-03-01), Marsh
patent: 4076614 (1978-02-01), Todd
patent: 4217207 (1980-08-01), Liller
patent: 4529506 (1985-07-01), Smit
patent: 5024770 (1991-06-01), Boyd et al.
patent: 5169004 (1992-12-01), Pos
Soils Magazine-Mar. 1994 by Greenfield Environmental.
Greenfield Environmental
Taylor Dennis L.
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