Method for leaching plutonium in waste resin

Abstract

The invention belongs to the technical field of nuclear facility decommisioning treatment, and particularly relates to a method for leaching plutonium in waste resin. The method comprises the steps ofweighing a waste resin sample, putting into a porcelain crucible, covering with a crucible cover, ashing in a muffle furnace, taking out, and placing to room temperature; adding HNO3+HF into a waterbath kettle for leaching, taking out, and placing to room temperature; filtering the leaching solution, fixing the volume to 10mL, accurately transferring the supernatant, adding a scintillation solution, fully shaking up, and measuring on a liquid scintillation counter; respectively weighing three groups of plutonium-containing waste resin samples in a porcelain crucible, requiring that upper-layer resin is weighed for first group, middle-layer resin is weighed for the second group and lower-layer resin is weighed for the third group, and covering a crucible cover; after ashing in a muffle furnace, transferring ash into a high-pressure digestion tank by using a nitric acid solution; and adding hydrofluoric acid and perchloric acid into the high-pressure digestion tank for high-pressure digestion. According to the invention, 90% or above of plutonium in the waste resin is transferred to an aqueous phase.

Description

technical field [0001] The invention belongs to the technical field of decommissioning treatment of nuclear facilities, and in particular relates to a method for leaching plutonium in waste resin. Background technique [0002] In the process of nuclear science and technology tests, reprocessing of spent reactor fuel, decommissioning of military nuclear facilities, and emergency treatment of nuclear leakage accidents, more transuranium long-lived a wastes will be produced. These a wastes are of various types, including metal wastes, non-metal wastes Non-combustible waste, non-metallic combustible waste. At present, there is a lack of corresponding technical means for the treatment of a waste at home and abroad, and temporary storage is still the main method. This will undoubtedly cause a waste of resources, because there are recyclable important raw materials for nuclear weapons and equipment in the long-lived a waste, such as plutonium. As nuclear reactor fuel (MOX) and fis...

AI Technical Summary

Problems solved by technology

At present, there is a lack of corresponding technical means for the treatment of a waste at home and abroad, and temporary storage is still the main method. This will undoubtedly cause a waste of resources, because there are recyclable important raw materials for nuclear weapons and equipment in the long-lived a waste, such as plutonium. As nuclear reactor fuel (MOX) and fissile material raw materials for nuclear weapons, it can also be used as fuel for aircraft carriers, submarines, space rockets, etc.

[0003] There are few reports at home and abroad on the residual waste—the enrichment and recovery of plutonium in waste resin. The only literature that can be used to guide plutonium recovery is the separation process of typical high-level radioactive waste liquid and the plutonium in the nuclear fuel reprocessing process. Extraction and separation. The object of extraction and separation is liquid. There is no report on the recovery of plutonium in solid waste resin. 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. method, but how to transfer the plutonium in the waste resin to the water phase is the primary technical difficulty to be solved

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