Process for the encapsulation and stabilization of radioactive,

Details Process for the encapsulation and stabilization of radioactive, Process for the encapsulation and stabilization of radioactive,

1994-11-07

1997-10-14

Mai, Ngoclan

Hazardous or toxic waste destruction or containment

Destruction or containment of radioactive waste

By fixation in stable solid media

588252, 588256, 106815, G21F 900

Patent

active

056782349

ABSTRACT:
The present invention provides a method for encapsulating and stabilizing radioactive, hazardous and mixed wastes in a modified sulfur cement composition. The waste may be incinerator fly ash or bottom ash including radioactive contaminants, toxic metal salts and other wastes commonly found in refuse. The process may use glass fibers mixed into the composition to improve the tensile strength and a low concentration of anhydrous sodium sulfide to reduce toxic metal solubility. The present invention preferably includes a method for encapsulating radioactive, hazardous and mixed wastes by combining substantially anhydrous wastes, molten modified sulfur cement, preferably glass fibers, as well as anhydrous sodium sulfide or calcium hydroxide or sodium hydroxide in a heated double-planetary orbital mixer. The modified sulfur cement is preheated to about 135.degree..+-.5.degree. C., then the remaining substantially dry components are added and mixed to homogeneity. The homogeneous molten mixture is poured or extruded into a suitable mold. The mold is allowed to cool, while the mixture hardens, thereby immobilizing and encapsulating the contaminants present in the ash.

REFERENCES:
patent: 3152984 (1964-10-01), Winsche et al.
patent: 3997355 (1976-12-01), Santucci et al.
patent: 4134775 (1979-01-01), Schwoegler
patent: 4269728 (1981-05-01), Schweitzer et al.
patent: 4290816 (1981-09-01), Ludwig et al.
patent: 4311826 (1982-01-01), McBee et al.
patent: 4348313 (1982-09-01), McBee et al.
patent: 4414385 (1983-11-01), Swanson
patent: 4428700 (1984-01-01), Lennemann
patent: 4496659 (1985-01-01), Nimer et al.
patent: 4500449 (1985-02-01), Kuhnke et al.
patent: 4594186 (1986-06-01), Kunze et al.
patent: 4601832 (1986-07-01), Hooykaas
patent: 4620947 (1986-11-01), Carlson
patent: 4629509 (1986-12-01), O'Hara et al.
patent: 4844815 (1989-07-01), Ader et al.
patent: 5037286 (1991-08-01), Roberts
patent: 5049285 (1991-09-01), Somerville et al.
Oak Ridge National Laboratory, "spent Fuel and Radioactive Inventories and Projections", DOE/NE-0017/2, ORNL Oak Ridge, TN (Sep. 1983).
"Second Progress Report for the WERF Incinerator", EGG-WM-8154, Idaho National Engineering Laboratory, EG&G Idaho, Inc. Idaho Falls Idaho (Jun. 1988).
Kalb and Colombo, "Modified Sulfur Cement Solidification of Low-Level Wastes, Topical Report", BNL 51923, Brookhaven National Laboratory, Upton, NY (Oct. 1985).
Shelton, "Supply and Demand for Sulphur in the United States", Sulphur '81, Calgary, alberta Canada (May 25-28, 1981).
"SCRETE Sulfur Concrete", Manufacturer's Data Sheet, Chevron Chemical, Co., San Francisco, CA.
Sullivan, et al., "Development and Testing of Superior Sulfur Concretes", RI-8160, Burearu of Mines, U.S. Department of the Interior, Washington, D.C. (1976).
Meyer, Sulfur, Energy and Environment, Elsevier Scientific Publishing Co., New York (1977).
Neilson and Colombo, "Properties of Radioactive Wastes and Waste Containers, First Topical Report", BNL NUREG-50957, Brookhaven National Laboratory, Upton, NY (Jan. 1979).
Neilson, Kalb, Fuhrmann and Colombo, "solidification of Ion Exchange Resin Waste in Hydraulic Cement", The Treatment and Handling of Radioactive Wastes, Blasewitz, et al. (eds.) springer-Verlag, NY (1983).
Jong et al., "Fiber Reinforcement of Concrete to Enhance Flexural Properties", RI-8956, Bureau of Mines, Department of Interior, Washington, DC (1985).
"Material Safety Data Sheet, CHEMENT.TM. 2000", Martin Chemical Inc. Houston, Texas (undated).
Van Dalen, Et al., "Modified Sulfur Cement as a Matrix for Non-Heat Generating Nuclear Wastes", Proceedings of an International Symposium on Management of Low and Intermediate Level Radioactive Waste Jointly Organized by the International Atomic Energy Society and the Commission of the European Communities and held in Stockholm, 16-20 May 1988, 2, 219-221 International Atomic Energy Agency, Vienna (1989).
Kalb, P. D. et al., "Encapsulation of Mixed Radioactive and Hazardous Waste Contaminated Incinerator Ash in Modified Sulfur Cement," BNL Report No. 43691, 1990.

Affiliated with

Also associated with

Rating

Process for the encapsulation and stabilization of radioactive, does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Process for the encapsulation and stabilization of radioactive, , we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Process for the encapsulation and stabilization of radioactive, will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1563383