Method for solidifying aqueous radioactive wastes for non-contaminating storage

US4297304A · kind A · utility

Assignee

• Kernforschungszentrum Karlsruhe GmbH · DE

Inventors

• Knut Scheffler · Blankenloch, DE
• Ulrich Riege · Linkenheim-Hochstetten, DE

Key dates

• Filing date: Jun 9, 1978
• Grant date: Oct 27, 1981
• Expiry date: Jun 9, 1998

Classification

• Technology area (CPC G): Physics
• CPC primary: G21F9/165
• WIPO field: Engines, pumps, turbines
• WIPO sector: Mechanical engineering

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…