Method for encapsulating hazardous wastes using a staged mold

Patent · Sun Jan 01 00:00:00 EST 1989

OSTI ID:867085

Unger, Samuel L ^[1]; Telles, Rodney W ^[2]; Lubowitz, Hyman R ^[3]

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1. Los Angeles, CA
2. Alhambra, CA
3. Rolling Hills Estates, CA

A staged mold and method for stabilizing hazardous wastes for final disposal by molding an agglomerate of the hazardous wastes and encapsulating the agglomerate. Three stages are employed in the process. In the first stage, a first mold body is positioned on a first mold base, a mixture of the hazardous wastes and a thermosetting plastic is loaded into the mold, the mixture is mechanically compressed, heat is applied to cure the mixture to form a rigid agglomerate, and the first mold body is removed leaving the agglomerate sitting on the first mold base. In the second stage, a clamshell second mold body is positioned around the agglomerate and the first mold base, a powdered thermoplastic resin is poured on top of the agglomerate and in the gap between the sides of the agglomerate and the second mold body, the thermoplastic is compressed, heat is applied to melt the thermoplastic, and the plastic is cooled jacketing the agglomerate on the top and sides. In the third stage, the mold with the jacketed agglomerate is inverted, the first mold base is removed exposing the former bottom of the agglomerate, powdered thermoplastic is poured over the former bottom, the first mold base is replaced to compress the thermoplastic, heat is applied to melt the new thermoplastic and the top part of the jacket on the sides, the plastic is cooled jacketing the bottom and fusing with the jacketing on the sides to complete the seamless encapsulation of the agglomerate.

• Research Organization: ENVIRONMENTAL POLYMERS INC
• DOE Contract Number: AC03-83ER80103
• Assignee: Environmental Protection Polymers, Inc. (Hawthorne, CA)
• Patent Number(s): US 4859395
• OSTI ID: 867085
• Country of Publication: United States
• Language: English

Related Subjects

method
encapsulating
hazardous
wastes
staged
mold
stabilizing
final
disposal
molding
agglomerate
stages
employed
process
stage
positioned
base
mixture
thermosetting
plastic
loaded
mechanically
compressed
heat
applied
cure
form
rigid
removed
leaving
sitting
clamshell
powdered
thermoplastic
resin
poured
top
gap
melt
cooled
jacketing
third
jacketed
inverted
exposing
former
bottom
replaced
compress
jacket
fusing
complete
seamless
encapsulation
removed leaving
staged mold
powdered thermoplastic
former bottom
cooled jacketing
thermoplastic resin
third stage
mold base
hazardous waste
hazardous wastes
removed exposing
rigid agglomerate
seamless encapsulation
thermosetting plastic
stabilizing hazardous
agglomerate sitting
mechanically compressed
final disposal
encapsulating hazardous
jacketed agglomerate
setting plastic
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