a uf 6 The treatment method of production tail gas eluent

Abstract

The invention belongs to the technical field of uranium conversion, and particularly relates to a processing method of tail gas leacheate produced by UF6. The processing method includes steps of selecting waste water generated from tail gas spraying process of the UF6 technique as a processing object; preparing 15-20% of sodium hydroxide solution by mass for neutralizing bicarbonate radical ion in the technical waste water, and making it transform to be carbanion, and reducing the competitive absorption of HCO3- to the metal uranium; adding the prepared sodium hydroxide solution in the technical waste water tank, and stirring the solution evenly by pressure air; pumping the prepared alkali uranium-bearing liquid waste to the filter by a centrifugal pump driven by magnetic force to filter and remove suspended particle impurities; pressing the waste liquid to an ion exchange pillar by compression air to absorb; filling strong basicity anion exchange resin to the ion exchange pillar; after the absorption and saturation of the ion exchange resin, using the mixed solution of 2 mol / L sodium chloride and 5% of sodium carbonate as desorption agent to desorb the ion exchange resin; settling the desorption liquid by solid sodium hydroxide, and recycling the metal uranium therein.

Description

technical field [0001] The invention belongs to the technical field of uranium conversion, in particular to a UF 6 A treatment method for the eluent of the production tail gas. Background technique [0002] At present, domestic and foreign to UF 6 There are two main treatment measures for alkaline uranium-containing waste liquid generated in the production process: one is to use ion exchange method for exchange adsorption treatment. The second is to use Ca(OH) 2 Alkalization, FeSO 4 Neutralization and final addition of precipitating agent are used for treatment, and the waste water can be discharged up to the standard after treatment. From the uranium conversion process itself, UO 2 Preparation of UF by hydrofluorination 4 Technology and UF 4 Fluorination to prepare UF 6 The technology is already at the leading level in China, but there is still a big gap between the indicators such as the three wastes discharge and the advanced uranium conversion production plants a...

AI Technical Summary

Problems solved by technology

From the uranium conversion process itself, UO 2 Preparation of UF by hydrofluorination 4 Technology and UF 4 Fluorination to prepare UF 6 The technology is already at the leading level in China, but there is still a big gap between the indicators such as the three wastes discharge and the advanced uranium conversion production plants abroad, especially the UF 6 CO in the alkaline uranium-containing waste liquid produced in the production tail gas washing process 3 2- 、HCO 3 - , F - , Cl - Coexistence, the existing technology has poor uranium removal effect, and it is difficult to reach the maximum allowable limit of 0.05mg / L for wastewater discharge

Currently, domestic UF 6 The main problems in the treatment of alkaline uranium-containing wastewater generated in the production process are as follows: (1) The content of bicarbonate ions in the alkaline uranium-containing waste liquid is relatively high, and the adsorption effect of resin on uranium in the waste liquid is affected by ion exchange. The influence of bicarbonate ion content in the waste liquid is more obvious; (2) The concentration of metal uranium in the waste liquid after ion exchange adsorption treatment does not meet the discharge standard