Leaching method for plutonium in concrete

Abstract

The invention discloses a leaching method for plutonium in concrete. The leaching method comprises the following steps: S1, crushing and grinding plutonium polluted concrete, and screening the concrete into a test sample with a size of 200 [mu]m-125 [mu]m through a screening instrument; S2, weighing and adding 5.0g of the test sample with the size of 200 [mu]m-125 [mu]m into a 50mL plastic centrifugal tube, adding 25 mL of 4.5 mol / L HNO3-5%H2O2 solution, taking out the sample, performing centrifugal phase splitting, and leaving residues into the centrifugal tube; and S3, washing the residues in the centrifugal tube with 20 mL 4.5 mol / L HNO3-5%H2O2, and performing centrifugal phase splitting again.

Description

Technical field [0001] The technical field of nuclear facility decommissioning treatment specifically relates to a method for leaching plutonium in concrete. Background technique [0002] There are few reports on the plutonium enrichment and recovery of α-residual waste in concrete at home and abroad. The only literature that can be used to guide plutonium recovery is the extraction of plutonium in the typical high-level liquid waste separation process and nuclear fuel post-treatment process. The object of extraction and separation is liquid. There is no report on the recovery of plutonium in solid concrete. For the study of plutonium recovery technology, the extraction and separation of plutonium can use the high-level waste liquid separation process and the extraction and separation method of plutonium in the nuclear fuel post-treatment process. But how to transfer the plutonium in the concrete to the water phase is the first technical difficulty to be solved. Summary of the i...

AI Technical Summary

Problems solved by technology

[0002] There are few reports at home and abroad on the enrichment and recovery of plutonium in concrete, which is the α-residual waste. The only literature that can be used to guide the recovery of plutonium is the extraction of plutonium in the typical high-level radioactive waste liquid separation process and nuclear fuel reprocessing process. Separation, the object of extraction and separation is liquid, and there is no report on the recovery of plutonium in solid concrete. For the research on plutonium recovery process, the extraction and separation of plutonium can refer to the extraction and separation of plutonium in the high-level radioactive waste liquid separation process and nuclear fuel reprocessing process. But how to transfer the plutonium in the concrete to the water phase is the primary technical difficulty to be solved