Complex facilities for the treatment of uranium-containing slurries

 

(57) Abstract:

The invention relates to containers-storage uranium ore processing waste factories. Complex facilities for the treatment of uranium-containing slurries processing plants consists of several basins installed on the same or different levels, surrounded by dams and equipped with anti-filtration layers. A distinctive feature of it is that it contains at least two pools: pool a sump and a self-cleaning pool, between which is made of the grout curtain in the form of a trench filled with a mixture of diatomaceous earth or zeolite with with peat. To fill the trench mixture of diatomaceous earth or zeolite with with peat taken in the ratio 1:1. Pool clarifier is made in the form of a pit having a multilayer insulation at the bottom of which laid a plastic film or layer hydrologists clay, then a layer of fine-grained quartz sand that hosts coarse-grained polymict sand. Self-cleaning pool, made in the form of the pit has a multilayer insulation at the bottom of which is laid a layer of sand-gravel mixture, then the mixture of fly ash and red mud, a layer of anhydrite, a layer of diatomaceous earth or zeolite, presky result - effective prevention of environmental contamination by uranium. 3 C.p. f-crystals, 1 Il.

The invention relates to containers-storage uranium ore processing waste factories.

The known method, which serves to prevent contamination of groundwater with uranium migrating from an array dumps generated when the open pit uranium deposits (RF patent N 2075125, IPC G 21 F 9/20, bull. N 7, 1997) Initially produce a research field and direction of migration of contaminated carbonate uranium-bearing waters. Then on the way migration flow stack sequentially buffer layer from acidic rocks (mainly sulfates) and the barrier of fine granular clays.

With the passage of uranium-bearing waters of the buffer layer there is a change of mode waters, and as a consequence, the recovery of uranyl ion migrating in the water reducing agents. Because of the inertia of the system uranium will not be deposited on the buffer layer, and will focus on sorption geochemical barrier.

The disadvantage of this method and structures for its implementation is that they do not allow clear water slurries from dissolved compounds above

Closest to the proposed to the technical essence and the achieved result is the deposition of tailings in the complex of buildings representing several swimming pools that are installed sequentially, surrounded by dams and equipped with anti-filtration layers. (see "Nuclear technology abroad", 1975, No. 11, S. 14-19). Data structures taken as a prototype.

The disadvantages of the construction of the prototype is that they do not purify water slurries from dissolved compounds hexavalent uranium, which can infiltrates of structures in groundwater and surface water.

The objective of the invention is the development of complex structures of simple construction using natural materials to effectively clean up uranium slurries concentrators.

The problem is solved by the characteristics specified in the claims, in common with the prototype, such as a complex of facilities for the treatment of uranium-containing pulp processing plants, consisting of several basins installed on the same or different levels, surrounded by dams and equipped with anti-filtration layers, as well as distinctive, is the existing pool, between which is made of the grout curtain in the form of a trench, filled with a mixture of diatomaceous earth or zeolite with with peat.

According to p. 2 claims to fill the trench mixture of diatomaceous earth or zeolite with with peat taken in the ratio 1:1.

In paragraph 3 of the claims reflected the design of the pool tank, namely the pool clarifier is made in the form of a pit having a multilayer insulation at the bottom of which laid a plastic film or layer hydrologists clay, then a layer of fine-grained quartz sand that hosts coarse-grained polymict sand.

In paragraph 4 of the claims reflected the design of self-cleaning pool, namely, self-cleaning pool, made in the form of the pit has a multilayer insulation at the bottom of which is laid a layer of sand-gravel mixture, then the mixture of fly ash and red mud, a layer of anhydrite, a layer of diatomaceous earth or zeolite, and at the bottom of the pool bottom are charophytes, and on the surface of planktonic algae duckweed.

The invention is illustrated in the drawing. The drawing shows a complex of buildings with a swimming pool-sump "A" and self-cleaning pool "B", rasna 2. The protective layer of the basin consists of 3 anti-filtration layers: hydrologists clay (or plastic film) 3, fine quartz sand 4, coarse-grained polymict sand 5. Around the pool made the embankment (dam) 6 and cutoff trench 7 to a depth exceeding the depth of the pool "And". In trench 7 is filled with a mixture of diatomaceous earth or zeolite with with peat 8 in 1:1 ratio. In pool "And" filled with uranium-containing pulp 9. After settling purified from mechanical sediment water 10 is pumped by a pump (not shown) in pool "B".

Pool "B" is the pit 11, dug into the natural soil with multilayer insulation. At the bottom of the pool is laid a layer of sand and gravel 12, then the mixture of fly ash and red mud 13, the layer of anhydrite 14, then a layer of diatomaceous earth or zeolite 15. At the bottom of the pool bottom are charophytes 16, and on the surface of a pond - planktonic algae 17, such as duckweed. Around the pool "B" has the embankment (dam) 6 and cutoff trench 7. In the pool water 18 cleans from colloidal and ionic complexes of uranium.

The complex of buildings is as follows. Uranium-containing pulp 9 enters the pool "And" - entogo uranium, deposited on the bottom of the reservoir (Plotnikova geochemical barrier). The role of the float, performs plastic film or layer hydrologists clay 3. The clay layer 3, fine quartz sand 4 and coarse-grained polymict sand 5 create capillary rise and protect against infiltration.

Purified from mechanical suspensions forced water through the pipe 10 is pumped for further treatment in pool "B". If pools "a" and "B" are located at different levels, water flows from one pool to another by gravity.

To eliminate the possible infiltration flows from the pool "And" salt of uranium, for example, when the breakthrough film 3, constructed of an impervious veil 7 in the form of a trench filled with a mixture of diatomaceous earth or zeolite with with peat 8.

If the pool "A" is located on the slope of the trench 7 can only be on one side, down the slope.

The process of water self-purification from the soluble uranium compounds in pool "B" starts in the water column 18. Here at phytogenic geochemical barrier ions { UO2[CO3]3}4-UO22+and other partially absorbed by duckweed and horowimi algae. In hard-shelled layer 15, which characterizahere, performs the role of hydrodynamic barrier to the ascent of the peat layer 14.

Layer 14 is the biochemical formation of hydrogen sulphide. The source of hexavalent sulfur is anhydrite (CaSO4) 14. Hexavalent sulfur, sulfatoxymelatonin bacteria in the presence of organic matter (peat) recovers and gives the hydrogen sulfide gas that migrates through hard-shelled layer 15 and on the migration routes restores hexavalent uranium to tetravalent, in the last part of the insoluble compounds accumulate in the layers 14 and 15. Hard-shelled layer 15 works as a sorption barrier that holds ions of uranium.

In the layer 13 ash creates an alkaline environment, which acts as an alkaline barrier that will go coagulation of colloidal solutions containing uranium. There is also a sorption barrier - red sludge delayed negatively charged ions of uranium {UO2[CO2]3}4-and others.

Water purified from colloidal and ionic compounds of uranium that is filtered into the layer 12, which acts as the collector. From the layer 12 water can migrate through the permeable soil or force vymachivaete, made of inexpensive, natural materials or waste, preventing pollution uranium.

1. Complex facilities for the treatment of uranium-containing pulp processing plants, consisting of several basins installed on the same or different levels, surrounded by dams and equipped with anti-filtration layers, characterized in that the complex contains at least two pools, the pool tank and self-cleaning pool, between which is made of the grout curtain in the form of a trench filled with a mixture of diatomaceous earth or zeolite with with peat.

2. Complex p. 1, characterized in that the filling of the trench mixture of diatomaceous earth or zeolite with with peat taken in the ratio 1:1.

3. The complex PP.1 and 2, characterized in that pool clarifier is made in the form of a pit having a multilayer insulation at the bottom of which laid a plastic film or layer hydrologists clay, then a layer of fine-grained quartz sand that hosts coarse-grained polymict sand.

4. The complex PP.1 and 2, characterized in that a self-cleaning pool, made in the form of the pit, has mnogosloinost, a layer of diatomaceous earth or zeolite, and at the bottom of the pool bottom are charophytes, and on the surface of planktonic algae duckweed.

 

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