Method for ultimate disposition of borate containing radioactive wastes by vitrification

• US 4,424,149 A
• Filed: 06/09/1981
• Issued: 01/03/1984
• Est. Priority Date: 06/20/1980
• Status: Expired due to Fees

• Current Assignee: Kraftwerk Union AG Mulheim Germany
• Original Assignee: Kraftwerk Union Aktiengesellschaft (Siemens AG)
• Inventors: Bege, Dietmar, Puthawala, Anwer, Faust, Hans-Joachim, Stu/ nkel, Helmut
• Primary Examiner(s): Kyle, Deborah L.
• Assistant Examiner(s): Locker, Howard J.
• Application Number:
  US06/271,822
• Time in Patent Office: 938 Days
• Field of Search: 252/629, 252/626
• US Class Current: 588/11
• CPC Class Codes: G21F 9/305 Glass or glass like matrix C03B5/005 takes precedence; compositional aspects C03C

Abstract

Method for the ultimate disposition of radioactive wastes by vitrification, in which weak to medium radioactive waste concentrates from borate-containing radioactive liquids are mixed with added glass-forming materials, maximally in a ratio of 1:3, and the mixture heated to obtain a glass-forming melt.

Claims

1. Method for ultimate disposition of radioactive wastes by vitrification of weak-to-medium active concentrates containing boron together with ion exchange resins, which comprises mixing weak-to-medium active radioactive waste concentrates from borate-containing radioactive liquids with added glass-forming materials, maximally in a ratio of 1 part by weight waste concentrates to 3 parts by weight glass-forming materials, to form a glass composition in which the borate in said waste concentrate is an essential element in production of glass from the composition, before subjecting said glass composition to a melting operation, adding ion exchanger resins in an amount up to about 10 weight percent of the total mass, treating the resultant glass composition containing ion exchanger resins to obtain a glass-forming melt, and withdrawing and purifying waste gases evolved during said melting operation.

2. Method according to claim 1, wherein the method of vitrification is a discontinuous operation in which the components in the proportions making up the charge to be melted are intermittently introduced in portions into a vessel wherein each portion is heated for a sufficient length of time to obtain a glass-forming melt and effect complete combustion of the combustible parts of said resins, and wherein said procedure is repeated with other portions of the charge without discharging molten products from the vessel during the repeated chargings and meltings of the portions of charge.