Hazardous or toxic waste destruction or containment – Containment – Solidification – vitrification – or cementation
Patent
1994-12-27
1997-09-30
Graysay, Tamara L.
Hazardous or toxic waste destruction or containment
Containment
Solidification, vitrification, or cementation
588252, B09B 300
Patent
active
056721463
ABSTRACT:
A process in which a calcining step is used to provide a stable clinker containing the EAF dust. The clinker meets all of the applicable leaching standards. It also appears to be possible to use largely oxidic wastes from other processes, such as zinc electroplating residues, and the largely oxidic residues from refuse fuelled power generators. In this low temperature vitrification process a powder composition containing from 20% to 63% by weight waste material, from 30% to 73% by weight silica, and from 7% to 30% by weight alumina, is wetted to form a homogenous mass. The mass is fired in a furnace for a sufficient time and to a temperature of less than about 1,300.degree. C. to cause vitrification; and the vitrified product is recovered as a fired clinker. The clinker, after crushing, can be used as a road aggregate, in tarmac mixes, or after crushing to a suitably small powder, in the making of bricks and tiles having good abrasion and heat resistance.
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Graysay Tamara L.
Her Majesty the Queen in right of Canada as represented by the
Lagman Frederick L.
Wilkes Robert A.
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