The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 27, 1981
Filed:
Jun. 09, 1978
Knut Scheffler, Eggenstein-Leopoldshafen, DE;
Ulrich Riege, Linkenheim-Hochstetten, DE;
Kernforschungszentrum Karlsruhe, GmbH, Karlsruhe, DE;
Abstract
Method for solidifying high and medium radioactivity and/or actinide containing aqueous waste concentrates or fine-grained solid wastes suspended in water for final noncontaminating storage. The waste concentrates or suspensions are set, by evaporation, to a water content in the range between 40 and 80 percent by weight, and a solid content whose metal ion and/or metal oxide component lies between 10 and 30 percent by weight of the evaporate being formed. The pH of the evaporate is set to between 5 and 10. The evaporate is kneaded with a clay-like substance containing a small quantity of cement or such a clay-like substance or mixture of a clay-like substance with a small quantity of cement containing an additive for suppressing the volatility of the alkalis or alkali earths and/or an additive for suppressing the volatility of any decomposing anions which may be present in the evaporate from the group including sulfate, phosphate, molybdate and uranate ions. The kneading occurs at a weight ratio range of evaporate to clay-like substance of 1:1 to 2:1. Molded bodies are produced from the resulting kneaded mass. The molded bodies are then heat treated including drying at temperatures between room temperature and about 150.degree. C., calcining at temperatures up to about 800.degree. C. and subsequently firing at temperatures between 800.degree. C. and 1400.degree. C. to form practically undissolvable mineral phases. The molded bodies of fired mineral phases are enclosed on all sides in a dense, continuous ceramic or metallic matrix.