A kind of uranium-containing wastewater treatment method

Abstract

The invention belongs to nuclear fuel circulation technologies, and specifically discloses a uranium-containing wastewater treatment method. The treatment method is characterized in that firstly uranium-containing wastewater is subjected to pre-filtration, and followed by acidification treatment and alkalization treatment; and after being filtered again, the wastewater is subjected to silica gel adsorption uranium removing, after the wastewater reaches standards, deep treatment is performed, and if the wastewater does not reach the standards, deep treatment is performed after silica gel desorption. According to the treatment method, particulate matters in the wastewater are removed through pre-filtration firstly, thereby avoiding high temperature acidification making the uranium concentration of the wastewater increased to bring critical safety problems; with the help of the high temperature acidification, acid gases are driven off, and organic matters are destroyed, thereby avoiding affecting the adsorption of the silica gel on uranium; after the acidification, ammonia water, sodium hydroxide or the like is added to precipitate most of the uranium in the wastewater, thereby reducing the uranium concentration in the wastewater, and the precipitated wastewater is subjected to two stage filtration to make most of uranium-containing particles intercepted, thereby avoiding the uranium-containing particles polluting the silica gel, and improving the service life and the adsorption effect of the silica gel.

Description

technical field [0001] The invention belongs to nuclear fuel cycle technology, in particular to a treatment method for radioactive uranium-containing wastewater in the nuclear fuel manufacturing process Background technique [0002] A large amount of uranium-containing wastewater is unavoidably produced during the production of nuclear materials. These wastewater cannot be discharged directly. Most of the uranium in the wastewater must be removed before discharge to avoid pollution to the environment. The existing treatment methods for wastewater containing natural uranium mainly fall into the following three categories: [0003] One is the chemical precipitation method. The chemical precipitation method is to remove uranium in wastewater by adding soluble chemical reagents to uranium-containing wastewater to make uranium ions form insoluble or poorly soluble compounds to precipitate out. The chemical precipitation method has mature technology and high operational reliabil...

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Problems solved by technology

However, the membrane has not been widely used due to its strict requirements on wastewater composition, pH value, etc., and is extremely easy to damage.

[0006] In the nuclear fuel cycle system, all three methods are used. The ion exchange method is the most widely used and the technology is the most mature. However, the uranium concentration of the treated uranium-containing wastewater is difficult to reach below 50 μg / L, and the applicability is not strong. Generally, a variety of ion exchange resins can only be used for a specific type of wastewater, and are not suitable for mixed wastewater with different properties and sources.

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