An Aluminum Matrix Mercury Catalytic Technology Dissolving System

Abstract

The invention belongs to the technical field of spent fuel reprocessing, and specifically relates to a system for dissolving aluminum matrices by virtue of mercury catalysis technology. The system isused for dissolving aluminum matrix rings of a neptunium target by virtue of a mercury catalysis dissolution reaction. The system comprises a strong-acid-resistant and high-temperature-resistant dissolving tank (1), wherein the dissolving tank (1) is provided with a feeding chute (18) and used for performing the mercury catalysis dissolution reaction; a temperature control device for adjusting thetemperature of the dissolving tank (1) is arranged on the periphery of the dissolving tank (1); the dissolving tank (1) is also provided with, in a running-through manner, a dripping pipe (22) for adding nitric acid, a charging pipe (20) for adding a mercuric nitrate solution, a bubbling pipe (23) for introducing nitrogen into a dissolving solution in the dissolving tank (1), and a discharging pipe (21) for discharging the dissolving solution in which the aluminum matrix rings are dissolved; and the top of the dissolving tank (1) is also provided with an exhaust outlet (25). The system for dissolving the aluminum matrices by virtue of the mercury catalysis technology can control and recover a large amount of H2 and NOx gases generated in the dissolution reaction, and can control the speedof the dissolution reaction so as to avoid a risk of explosion caused by over high concentration of H2.

Description

technical field [0001] The invention belongs to the technical field of spent fuel reprocessing, and in particular relates to an aluminum matrix mercury catalytic technology dissolution system. Background technique [0002] After the neptunium target is irradiated out of the reactor, it contains converted plutonium and remaining neptunium and other radioactive elements, which are all dispersed in the aluminum matrix ring of high-purity aluminum ( figure 1 ), the purity of aluminum is 99.999%. Before using chemical extraction and separation methods to extract the neptunium and plutonium elements, it is first necessary to dissolve the aluminum matrix ring containing neptunium and plutonium elements. [0003] Since aluminum metal is relatively active, it is easy to form an oxide film protective layer when it is oxidized in nitric acid, which hinders the dissolution, so it cannot be dissolved directly with nitric acid. Mercury is generally used as a catalyst and dissolved by hea...

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Problems solved by technology

The reaction is very rapid, difficult to control, and produces a large amount of gas

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