Concentration method for nuclear-pure uranyl nitrate solution

Abstract

The invention belongs to the field of uranium purification, and concretely relates to a concentration method for a uranyl nitrate solution. The method comprises the following steps: 1, determining a system used by the method; 2, carrying out water test; 3, verifying the performances of membranes; 4, carrying out nanofiltration membrane concentration; and 5, carrying out reverse osmosis membrane concentration. The method has the advantages of simplicity in membrane separation concentration technology and device, normal temperature operation, no chemical reaction, low energy consumption, cleanness and no pollution.

Description

technical field [0001] The invention belongs to the field of uranium purification, in particular to a method for concentrating uranyl nitrate solution. Background technique [0002] When uranyl nitrate undergoes pyrolysis denitration reaction, it needs to absorb a large amount of heat, which makes the heat load of the denitration fluidized bed reactor very large. In order to reduce the heat required for pyrolysis and denitrification and reduce the heating power of the reaction equipment, it is necessary to concentrate the uranyl nitrate solution with a low uranium concentration to increase the uranium concentration of the solution. At present, the uranyl nitrate enrichment process of the domestic spent fuel reprocessing plant adopts single-effect evaporation, and the externally heated evaporator is the key equipment. In the field of uranium purification and conversion, the enrichment process uses multiple-effect evaporation technology. Regardless of whether it is single-ef...

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Problems solved by technology

Regardless of whether it is single-effect evaporation or multi-effect evaporation, the heat source of evaporation operation mainly adopts a steady stream of raw steam. For materials with low concentration and large processing capacity, the energy consumed by steam is considerable. For enterprises that need to purchase steam, as With the rise of steam prices in the market, the cost of steam operation is getting higher and higher, and the burden on enterprises has increased sharply

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