Method for treating activated carbon by chemical flocculation of radioactive waste liquid from nuclear facilities

Abstract

The invention provides a method for treating activated carbon by chemical flocculation of radioactive waste liquid from nuclear facilities. The method includes the following steps: a step of activation process, namely a step of activating a coconut shell carbonized material by a converter at 850 DEG C and forming holes by using high temperature steam to prepare a finished product with an iodine adsorption value that characterizes channel characteristics greater than or equal to 1000 mg / g and a methylene blue adsorption value greater than or equal to 150 mg / g; a step of post-treatment, namely astep of backwashing broken activated carbon particles, cleaning the particles with high-purity 30% hydrochloric acid and finally leaching the activated carbon particles with desalinated water with conductivity less than 2 [mu]s / cm to prepare the product with an acid soluble index less than or equal to 0.5%; and a step of drying, namely a step of using a quick drying fluidized bed and infrared heating combined rapid drying process to prepare the finished product with water content less than or equal to 3%. The method provided by the invention can effectively remove corrosion products in radioactive waste liquid from the nuclear facilities, meet the needs of engineering applications, ensure that waste generated by the process can be reasonably minimized and minimize the waste.

Description

Technical field [0001] The invention relates to a method for chemical flocculation treatment of activated carbon by radioactive waste liquid of nuclear facilities. Background technique [0002] According to my country's "Environmental Radiation Protection Regulations for Nuclear Power Plants" (GB 6249-2011), for coastal plant sites, the concentration of other radionuclides except tritium and carbon 14 in the radioactive effluent at the trough discharge outlet should not exceed 1000 Bq / L. For inland plant sites, the concentration of other radionuclides except tritium and carbon 14 in the radioactive effluent at the trough discharge outlet should not exceed 100Bq / L. According to the typical waste liquid source items of nuclear facilities, the overall waste liquid treatment system should be decontaminated Factor needs to reach 10 3 ~10 4 . According to the guidelines for the minimization of radioactive waste in nuclear power plants, it is required that the waste generated in the vari...

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Problems solved by technology

[0003] The radioactive waste liquid of pressurized water reactor nuclear power plant mainly includes several types such as reactor coolant effluent, ground drainage, hand washing waste liquid and chemical waste liquid. There are two types of fission products and colloidal / granular corrosion products. According to the operating experience of in-service power plants, colloidal / granular corrosion products account for a large proportion and are difficult to remove

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