Curing agent for curing radioactive wastes containing borate and method thereof

Abstract

The invention discloses a curing agent for curing radioactive wastes containing borate, belonging to the technical field of a waste treatment. The curing agent is the mixture of cement and sodium silicate, wherein the weight ratio of the cement to the sodium silicate is 100 to (1-15). The invention also discloses a method for curing the radioactive wastes containing the borate by utilizing the curing agent. The mixture of the cement and the sodium silicate in the invention can be used for curing the radioactive wastes generated in a nuclear power station, avoiding the phenomenon of non-condensing cement slurry because of the delayed coagulation of the borate adsorbed in the wastes on the cement and cracking of cement curing bodies after being soaked in water, enhancing the capacity, shortening the initial coagulation time of the cement slurry, and ensuring that no crack is generated on the surfaces of the curing bodies and various performance indexes can meet the requirements of the national standard GB14569.1-93.

Description

technical field [0001] The invention belongs to the technical field of waste treatment, and in particular relates to a curing agent for curing borate-containing radioactive waste and a method thereof. Background technique [0002] Radioactive waste is mainly produced in the nuclear industry, including radioactive waste resin and radioactive concentrate. [0003] Radioactive waste resin is one of the main low and medium radioactive wastes produced during the operation of nuclear power plants and nuclear facilities. During the operation of pressurized water reactor nuclear power plants, boric acid needs to be added to the primary circuit to control the reaction rate. Therefore, it is used to treat primary circuit water A large amount of boric acid will be adsorbed on the resin. Boric acid is a kind of retarder for cement. The existence of a large amount of boric acid will cause the setting time of cement to be too long, and the too long setting time will lead to the delaminati...

AI Technical Summary

Problems solved by technology

The cured body has defects such as low strength of the cured body and low resin inclusion capacity

[0004] Evaporation is the main method for the treatment of radioactive wastewater in nuclear power plants. After evaporation, the non-volatile radionuclides and salts in the wastewater are concentrated into the concentrated solution. This part of the concentrated solution has high radioactivity and high salt content, especially for the primary circuit of nuclear power plants. The content of boric acid in the concentrated solution to control the reactivity can reach tens to hundreds of g / L, and the retarding effect caused by high concentration of borate makes the cement solidified body of the concentrated solution also have cracking, low strength, Defects such as low capacity