Apparatus for using hazardous waste to form nonhazardous aggregate

Patent · Tue Jan 22 04:00:00 EST 1991

OSTI ID:6013690

Kent, J M

This patent describes an apparatus for converting hazardous waste into non-hazardous, non-leaching aggregate. It comprises: a rotary kiln having an entry portion; oxidizing means adjacent the entry portion of the kiln, the oxidizing means comprising a water-cooled, metal-walled vessel; a source of solid waste material, the solid waste material comprising large solid waste and waste fines; means for separating the large solid waste from the waste fines; means for introducing the large solid waste to the entry portion of the rotary kiln; means for introducing the waste fines to the oxidizing means; means for inducing combustion in the kiln to convert the large solid waste to solid particulate primary aggregate, clinker, volatile gases and gaseous combustion by-products; means for separating the clinker from the solid particulate primary aggregate; means for inducing combustion in the oxidizing means to convert the waste fines, the volatile gases and the gaseous combustion by-products into noncombustible fines, molten slag, and waste gas; means for passing the gaseous combustion by-products from the kiln and the waste gas from the oxidizing means; means for cooling the noncombustible fines and the waste gas; means for separating the noncombustible fines and the waste gas; means for introducing the solid particulate primary aggregate and the noncombustible fines, to the molten slag to form a substantially molten mixture; means for removing the mixture from the apparatus; and means for cooling the substantially molten mixture to form the non-hazardous, non-leaching aggregate.

• Assignee: NOV; NOV-91-017051; EDB-92-011374
• Patent Number(s): US 4986197; A
• Application Number: PPN: US 7-520558
• OSTI ID: 6013690
• Country of Publication: United States
• Language: English

Related Subjects

32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION
320305* -- Energy Conservation
Consumption
& Utilization-- Industrial & Agricultural Processes-- Industrial Waste Management
320604 -- Energy Conservation
Consumption
& Utilization-- Municipalities & Community Systems-- Municipal Waste Management-- (1980-)
AGGLOMERATION
DESIGN
HAZARDOUS MATERIALS
INDUSTRIAL PLANTS
KILNS
MANAGEMENT
MATERIALS
PROCESSING
SEPARATION PROCESSES
SOLID WASTES
WASTE MANAGEMENT
WASTE PROCESSING
WASTE PROCESSING PLANTS
WASTE PRODUCT UTILIZATION
WASTES