Equipment and method for extracting uranium from high-density pulp

Abstract

The invention provides a device and a method for extracting uranium from high-density ore pulp. The device and the method are used for extracting uranium when the density of an ore pulp solution is higher that of resin. A part of the high-density ore pulp is filtered to obtain a clear solution used as a cleaner, and most of the ore pulp is used as an adsorption primary pulp. The adsorption primary pulp, the cleaner and the resin are added in the device at a certain speed to finally obtain adsorption tail pulp of which the uranium concentration meets the requirement and resin cleaned and loaded with uranium. The device adopts a trough adsorption device capable of treating the high-density ore pulp. The resin and the ore pulp reversely flow continuously and automatically among stages in a trough. The holdup fractions of the resin in all the stages can be controlled. When uranium in the high-density ore pulp is adsorbed, the ore pulp needs not to be diluted, so that the component concentration of an adsorption feed solution is improved; only a small amount of raw materials realize solid-liquid separation, so that the problem of difficulty in solid-liquid separation of the adsorption feed solution is solved; and new water is not required in cleaning, so that wastewater discharge is reduced, and the recovery rate of uranium is increased.

Description

technical field [0001] The invention belongs to the technical field of ion exchange extraction of uranium, and in particular relates to a device and method for extracting uranium from high-density pulp. Background technique [0002] The existing uranium extraction process can be divided into solvent extraction and ion exchange according to the extraction method, and can be divided into clear liquid extraction and suspension extraction according to the properties of the raw materials. In the process of industrial practice, the pulp is often separated from solid and liquid, and the clear liquid is obtained and then the uranium is extracted. Occasionally, there are research reports on pulp extraction and pulp adsorption. The main problem of supernatant extraction is solid-liquid separation. On the one hand, the solid-liquid separation itself may be difficult. On the other hand, after the solid-liquid separation, the solid residue needs to be washed, which will generate a large...

AI Technical Summary

Problems solved by technology

[0004] 1) Most adsorption equipment cannot handle suspensions

Commonly used fixed beds and moving beds cannot directly perform suspension adsorption

For systems such as ore pulp with high solid content, it is necessary to perform solid-liquid separation by filtration and other operations first, and then perform clear liquid adsorption after obtaining the clear liquid, otherwise the suspended solids in the ore pulp will accumulate in the resin bed, which may cause tower blockage on the one hand. , on the other hand, the suspended solids in the bed are difficult to clean, and it is easy to contaminate the eluent product

In some pulp systems, the pulp is difficult to filter and clarify, and the solid-liquid separation is particularly difficult, which brings great difficulties to the operation of clear liquid adsorption

Using the clear liquid adsorption process, it is necessary to introduce new water to fully wash the solids such as the filter cake obtained during the solid-liquid separation of the raw material liquid, which increases water consumption and inevitably produces more waste water

[0005] 2) The existing tower-type suspension adsorption equipment cannot handle raw materials with high density and high solid content

In addition, high solid content will cause problems such as plugging of sieve plates and difficulty in separating resin suspended matter.

In the improved USBM tower in France, the solid content of the suspension is 50% higher than before the improvement, but the solid content of the suspension is only 6%. It is difficult to handle the slurry with a higher solid content

[0006] 3) The existing trough-type suspension adsorption equipment cannot handle high-density pulp, and the transfer of resin between stages or inside the equipment is difficult, and the continuous operation effect is poor

It is easy to block the holes during the screen separation process, making it difficult to separate the resin and pulp

The existing trough-type suspension adsorption equipment has poor continuous operation effect, and the resin transfer process between stages is complicated

Limited by the resin transfer structure, the density of the pulp solution cannot be greater than the resin density, and the current tank adsorption equipment cannot handle high-density pulp

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