Method and device for extracting uranium from monazite high-density acid-soluble ore slurry

Abstract

This invention relates to the field of uranium extraction technology, and more particularly to a method and apparatus for extracting uranium from high-density acid-soluble monazite slurry. The apparatus comprises: a resin discharge column and an adsorption column connected by an inclined tube penetrating the sidewall; the inclined tube slopes upwards from the adsorption column end to the resin discharge column end; the adsorption column has a resin filling port at the top, an overflow port on the upper sidewall, and a slurry inlet valve and a first backup valve at the bottom; the resin discharge column has a resin discharge valve at the top, a second backup valve on the upper sidewall, and a connecting valve at the bottom. The method utilizes the above apparatus to achieve: resin enters from the bottom of the column, enters from the top, undergoes a countercurrent adsorption process, and finally obtains uranium-loaded resin and qualified uranium adsorption tailings. This invention avoids inter-equipment transfer during resin adsorption, allows for continuous addition of lean resin, and ensures stable discharge of saturated resin; it guarantees the resin adsorption capacity gradient, facilitates solid-liquid separation of the adsorbed slurry, and ensures a high uranium recovery rate.

Description

Technical Field

[0001] This invention relates to the field of uranium extraction technology, and in particular to a method and apparatus for extracting uranium from high-density acid-soluble monazite slurry. Background Technology

[0002] Monazite is an important raw material for rare earth element extraction. Its main components are Ce, La, Nd, and Th phosphate minerals, and it also contains 0.3-0.5% U and 15-20% Th. Due to the presence of radioactive elements uranium and thorium, the development of this resource must currently follow a comprehensive resource utilization approach. Alkali decomposition of monazite concentrate yields hydroxides containing uranium, thorium, and rare earth elements, commonly known as "alkali cake." This "alkali cake" is then dissolved in high acid to obtain an acid-soluble slurry containing uranium, thorium, and rare earth elements. This slurry has problems such as high total ion content, high density, and difficulty in filtration. To avoid filtration difficulties, slurry adsorption is the best method for extracting and separating uranium from acid-soluble slurries; therefore, the design of uranium extraction equipment using slurry adsorption is crucial.

[0003] In uranium hydrometallurgical processes, ion exchange adsorption processes employ different types of adsorption equipment based on the characteristics of the feed solution, such as compacted beds, fluidized beds, stirred beds, and moving beds. These devices are typically suitable for solutions or slurry systems with high resin density and low overall solution density. However, using these devices to treat solutions with high slurry density often presents several challenges.

[0004] (1) Fixed beds can usually only be operated by cutting the tower. During the resin washing process and adsorption process, the resin is heavier than the washing agent and the original solution. In addition, fixed beds usually use clear liquid adsorption. The mineral slurry adsorption solution causes solid accumulation in the adsorption tower bed and bed blockage, which makes it impossible to use fixed beds for adsorption of high-density mineral slurry systems.

[0005] (2) During the adsorption process of slurry, fluidized bed and stirred bed are prone to resin wear, affecting the service life of the resin and failing to form a capacity gradient between resin beds; heavy slag is prone to settle at the bottom of the equipment, forming dead corners, which affects the adsorption of uranium and the equipment stability is poor.

[0006] (3) In a dense moving bed, the resin moves in a piston-like manner within the tower-type equipment in a dense state, which approximates an ideal countercurrent adsorption state. In the stable state of uranium extraction from a high-density slurry system, the resin floats on the upper layer of the slurry. In a conventional dense moving bed, when the resin enters from the top of the column, it moves in a dense state under gravity, resulting in poor stability and difficulty in discharging the resin from the lower end. Summary of the Invention

[0007] The technical problem to be solved by this invention is to provide a method and apparatus for extracting uranium from high-density acid-soluble monazite slurry, avoiding inter-equipment transfer during resin adsorption, diverting and returning adsorption tail liquid to complete the continuous addition of lean resin, and avoiding the problem of difficulty in discharging saturated resin from the bottom of the tower; realizing the counter-current flow of resin and slurry, ensuring the resin adsorption capacity gradient, completing the ion exchange adsorption process between resin and slurry, and solving the problems of resin loading and discharge in the equipment.

[0008] The present invention provides an apparatus for extracting uranium from high-density acid-soluble monazite slurry, comprising: an adsorption column and a resin discharge column;

[0009] The resin discharge column and the adsorption column are connected by an inclined tube that runs through the side wall; the inclined tube is inclined upward from the adsorption column end to the resin discharge column end.

[0010] The top of the adsorption column is provided with a resin filling port, the upper side wall is provided with an overflow port, and the bottom is provided with a slurry inlet valve and a first standby valve.

[0011] A resin discharge valve is provided at the top of the resin discharge column, a second spare valve is provided on the upper side wall, and a connecting valve is provided at the bottom.

[0012] Preferably, a screen is provided at the overflow port.

[0013] Preferably, the upper part of the adsorption column is funnel-shaped, with a resin filling port at the top of the funnel and an overflow port on the side wall.

[0014] Preferably, the distance between the connection end of the inclined tube and the bottom of the adsorption column is 30-100 cm.

[0015] Preferably, the adsorption column has a height of 5 to 10 m and a diameter of 0.3 to 1.0 m.

[0016] This invention provides a method for extracting uranium from high-density acid-soluble monazite slurry using the extraction device described above, comprising the following steps:

[0017] Step S1: [The following appears to be a separate, unrelated section:] ...with a specific gravity of 1.3–1.40 g / cm³ 3 The slurry is pumped in from the bottom of the adsorption column, and the flow rate is controlled to keep the adsorption resin floating in the upper part of the tower. The adsorption tail liquid flows out from the overflow port at the top of the tower.

[0018] Step S2: After the resin at the bottom of the resin bed is saturated, stop adding slurry, open the standby valve or connecting valve of the resin discharge column, and continue to fill lean resin from the top of the adsorption tower.

[0019] Step S3: After the lean resin is filled, continue to add slurry. By controlling the resin discharge valve of the resin discharge column, the slurry carries the saturated resin upward along the adsorption column, and then moves into the resin discharge column through the inclined tube, and finally is discharged from the top of the resin discharge column.

[0020] Preferably, in step S1, the specific gravity is 1.3–1.40 g / cm³. 3 The method for preparing the slurry is as follows:

[0021] The high-density slurry containing 10%–30% high-density minerals is countercurrent thickened to separate the heavier slag with a specific gravity of 1.3–1.40 g / cm³. 3 slurry.

[0022] Preferably, in step S2, the relationship between the resin loading amount, frequency, and the distance h between the inclined tube and the bottom of the adsorption column is determined according to formulas (1) to (3):

[0023] Resin filling volume (ml) × 0.4 / contact time (min) = flow rate (ml / min) (1)

[0024] Flow rate (ml / min) / saturated bed volume = resin packing frequency (ml / n hours) (2)

[0025] h(m) = Resin filling frequency (ml / n hours) / Column cross-sectional area (m²) 2 (3);

[0026] The linear velocity of the empty tower is 5-10 m / min.

[0027] Preferably, in step S3, after the saturated resin is discharged, the saturated resin is leached with a leaching agent to obtain a leaching solution and lean resin; the lean resin is then cleaned or transformed before entering the resin adsorption tower for recycling.

[0028] Preferably, in step S2, the lean resin is soaked in the adsorption tail liquid and then loaded from the top of the adsorption tower.

[0029] Compared with existing technologies, the present invention provides a method and apparatus for extracting uranium from high-density acid-soluble monazite slurry. It features a connected adsorption column and a resin discharge column. During resin adsorption, a dynamic equilibrium system is formed within the adsorption column, and saturated resin is continuously discharged from the resin discharge column through an inclined tube. This equipment meets the process requirements for uranium extraction via ion exchange adsorption from acid-soluble monazite slurry. Both the resin adsorption capacity and the concentration of the adsorption tail liquid meet the process requirements. It solves the problem of uranium adsorption caused by resin floating on the surface of the slurry in tower-type equipment due to its high slurry density. It enables slurry adsorption, solving the problem of difficult solid-liquid separation in the original acid-soluble adsorption solution of monazite. Using this equipment avoids the difficulty of resin discharge from the bottom of the tower due to its low density, and also prevents resin transfer between equipment during adsorption. It allows for continuous addition of lean resin and discharge of saturated resin. It achieves counter-current flow between the resin and slurry, ensuring the resin adsorption capacity gradient and completing the ion exchange adsorption process between the resin and slurry, thus solving the problems of resin loading and discharge in the equipment. Attached Figure Description

[0030] Figure 1 A schematic diagram showing the structure of a device for extracting uranium from high-density acid-dissolved monazite slurry;

[0031] Figure 2 A flowchart illustrating the process of an apparatus for extracting uranium from high-density acid-dissolved monazite slurry;

[0032] Figure 3 A flowchart illustrating the method for extracting uranium from high-density acid-dissolved monazite slurry;

[0033] In the picture,

[0034] 1-Adsorption column, 2-Resin discharge column, 3-Inclined tube, 4-Resin filling port, 5-Overflow port, 6-Slurry inlet valve, 7-First standby valve, 8-Resin discharge valve, 9-Second standby valve, 10-Connecting valve. Detailed Implementation

[0035] To further understand the present invention, embodiments of the present invention are described below in conjunction with examples. However, it should be understood that these descriptions are only for further illustrating the features and advantages of the present invention, and not for limiting the present invention.

[0036] The present invention targets a high-density acid-soluble monazite slurry with a density greater than that of resin, where the resin floats on the surface of the slurry.

[0037] Embodiments of the present invention disclose an apparatus for extracting uranium from high-density acid-soluble monazite slurry, such as... Figure 1 As shown, it includes: an adsorption column 1 and a resin discharge column 2;

[0038] The resin discharge column 1 and the adsorption column 2 are connected by an inclined tube 3 that runs through the side wall; the inclined tube is inclined upward from the adsorption column end to the resin discharge column end.

[0039] The top of the adsorption column 1 is provided with a resin filling port 4, the upper side wall is provided with an overflow port 5, and the bottom is provided with a slurry inlet valve 6 and a first standby valve 7.

[0040] A resin discharge valve 8 is provided at the top of the resin discharge column 2, a second spare valve 9 is provided on the upper side wall, and a connecting valve 10 is provided at the bottom.

[0041] According to the present invention, the adsorption column 1 is mainly used for uranium adsorption, with resin added to the top and mineral slurry added to the bottom. The height of the adsorption column is preferably 5-10m, and the diameter is preferably 0.3-1.0m.

[0042] The upper part of the adsorption column 1 is preferably funnel-shaped, with a resin filling port 4 at the top of the funnel and an overflow port 5 on the side wall. In order to prevent the resin from being discharged with the adsorption tail liquid, a screen is provided at the overflow port 5.

[0043] The inclined tube 3 is used to move saturated resin from the adsorption column 1 to the resin discharge column 2, completing the transfer of saturated resin. The inclined tube 3 connects the side wall of the adsorption column 1 and the side wall of the resin discharge column 2, and is inclined upward from the adsorption column 1 end to the resin discharge column 2 end;

[0044] The distance h between the connection end of the inclined tube 3 and the bottom of the adsorption column 1 is preferably 30 to 100 cm.

[0045] The resin discharge column 2 is used for discharging saturated resin. A resin discharge valve 8 is provided at the top, a second spare valve 9 is provided on the upper side wall, and a connecting valve 10 is provided at the bottom for cleaning and draining the device.

[0046] Countercurrent slurry adsorption process, such as Figure 2 As shown in the left-hand view, the slurry enters from the bottom of the adsorption column 1, while the lean resin enters from the top of the adsorption column 1, and countercurrent adsorption occurs.

[0047] The process of filling with lean resin is as follows Figure 2 As shown in the middle view, close the slurry inlet valve 6 and the first standby valve 7, and open the second standby valve 9 or the connecting valve 10 of the resin discharge column 2. The lean resin is added from the top of the adsorption column 1, and the filling of the lean resin is completed by using negative pressure.

[0048] The saturated resin transfer process is as follows Figure 2As shown in the right-hand view, the resin window layer moves downward under the action of gravity. When the resin bed is lower than the connection between the inclined tube 3 and the adsorption column 1, the resin floats upward along the inclined tube due to its low density. At this time, the slurry inlet valve 6 and the resin outlet valve 8 are opened. The slurry rises and drives the resin to accumulate along the inclined tube towards the top of the resin outlet column 2, completing the transfer of saturated resin.

[0049] The device of the present invention can avoid inter-equipment transfer during the resin adsorption process, realize the continuous addition of lean resin and the stable discharge of saturated resin; realize the counter-flow of resin and slurry to ensure the resin adsorption capacity gradient; complete the ion exchange adsorption process between resin and slurry, and solve the problems of resin loading and discharge in the equipment.

[0050] Embodiments of the present invention also disclose a method for extracting uranium from high-density acid-soluble monazite slurry using the extraction device described in the above technical solution, such as... Figure 2 As shown, it includes the following steps:

[0051] Step S1: [The following appears to be a separate, unrelated section:] ...with a specific gravity of 1.3–1.40 g / cm³ 3 The slurry is pumped in from the bottom of the adsorption column, and the flow rate is controlled to keep the adsorption resin floating in the upper part of the tower. The adsorption tail liquid flows out from the overflow port at the top of the tower.

[0052] Step S2: After the resin at the bottom of the resin bed is saturated, stop adding slurry, open the standby valve or connecting valve of the resin discharge column, and continue to fill lean resin from the top of the adsorption tower.

[0053] Step S3: After the lean resin is filled, continue to add slurry. By controlling the resin discharge valve of the resin discharge column, the slurry carries the saturated resin upward along the adsorption column, and then moves into the resin discharge column through the inclined tube, and finally is discharged from the top of the resin discharge column.

[0054] The extraction method is described in detail below, step by step:

[0055] Step S1: [The following appears to be a separate, unrelated section:] ...with a specific gravity of 1.3–1.40 g / cm³ 3 The slurry is pumped in from the bottom of the adsorption column, and the flow rate is controlled to keep the adsorption resin floating in the upper part of the column. The adsorption tail liquid flows out from the overflow port at the top of the column.

[0056] The specific gravity is 1.3–1.40 g / cm³. 3 The method for preparing the slurry is as follows:

[0057] The high-density slurry containing 10%–30% high-density minerals is countercurrent thickened to separate the heavier slag with a specific gravity of 1.3–1.40 g / cm³. 3 slurry.

[0058] The adsorption column is filled with lean resin. To increase the resin flowability, it is preferable to fill the adsorption tower with 2 / 3 adsorption tail liquid, soak the lean resin with the adsorption tail liquid, and slowly add the lean resin along with the adsorption tail liquid into the resin adsorption column from the top of the tower until the lean resin floats steadily at the top of the adsorption column.

[0059] By opening the slurry inlet valve, the slurry is pumped in from the bottom of the adsorption column. The flow rate is controlled to keep the adsorption resin floating in the upper part of the column, and the adsorption tail liquid flows out from the overflow port at the top of the column.

[0060] Step S2: After the resin at the bottom of the resin bed is saturated, stop adding slurry, open the standby valve or connecting valve of the resin discharge column, and continue to fill lean resin from the top of the adsorption tower.

[0061] To increase fluidity, the lean resin is soaked in the adsorption tail liquid before being loaded from the top of the adsorption tower.

[0062] During resin adsorption, a dynamic equilibrium system is formed within the adsorption column. This equilibrium is achieved between the weight of the added lean resin itself, its buoyancy in the slurry, and the kinetic energy generated by the upward flow of the resin into the adsorption column. The amount of lean resin loaded can be controlled by adjusting the size of the resin adsorption column, thereby adjusting the slurry flow rate and the empty column linear velocity, and ultimately regulating the required production scale.

[0063] Lean resin is added from the top of the column. Utilizing the weight of the lean resin, a dynamic equilibrium between the resin and the acid-washed slurry is achieved by setting a specific resin compaction height. Acidic slurry enters from the bottom of the adsorption column, and the resin and acid-washed slurry are in countercurrent contact. The resin loading amount, frequency, and the distance h from the inclined tube to the bottom of the adsorption column are determined according to formulas (1) to (3):

[0064] Resin filling volume (ml) × 0.4 / contact time (min) = flow rate (ml / min) (1)

[0065] Flow rate (ml / min) / saturated bed volume = resin packing frequency (ml / n hours) (2)

[0066] h(m) = Resin filling frequency (ml / n hours) / Column cross-sectional area (m²) 2 (3);

[0067] The linear velocity of the empty tower is 5-10 m / min.

[0068] The resin loading in the adsorption column is determined based on the annual production scale of acidic slurry. Typically, the column height is 5–10 m, and the empty column velocity is 5–10 m / min. Based on the uranium-bearing slurry processing volume, the column diameter is usually designed to be 0.3–1.0 m. The ratio of resin loading to contact time in the adsorption column is the slurry flow rate. The loading frequency of lean resin is determined based on the saturated bed volume and flow rate, and can be adjusted to 0.3–5 L of lean resin every 2–5 hours depending on the production conditions. In a chloride ion system, strong basic anion exchange resin requires 35–55 bed volumes to reach adsorption saturation. The distance h from the pipe to the bottom of the adsorption column is determined based on the resin loading frequency and quantity, and is typically 30–100 cm.

[0069] Step S3: After the lean resin is filled, continue to add slurry. By controlling the resin discharge valve of the resin discharge column, the slurry carries the saturated resin upward along the adsorption column, and then moves into the resin discharge column through the inclined tube, and finally is discharged from the top of the resin discharge column.

[0070] After the saturated resin is discharged, it is leached with a leaching agent to obtain a leaching solution and lean resin. The lean resin is then cleaned or transformed before being recycled back into the resin adsorption tower.

[0071] To further understand the present invention, the method and apparatus for extracting uranium from high-density acid-soluble monazite slurry provided by the present invention will be described in detail below with reference to the embodiments. The scope of protection of the present invention is not limited to the following embodiments.

[0072] Example 1

[0073] Uranium was extracted from an acid-soluble mineral slurry using a certain resin. The density of the acid-soluble mineral slurry was 1.35 g / cm³. 3 The uranium content is 0.8 g / L, the resin content is 201×7, and the wet true density of the resin is 1.10 g / cm³. 3The device described in this invention is used for slurry adsorption. Equipment parameters: tower height 5.5m, resin filling capacity 11L, resin height inside the adsorption column 4.5m, tower diameter 5.6mm, h = 0.5m. First, close the slurry inlet valve at the bottom of the adsorption column. Fill the adsorption column with 2 / 3 adsorption tailings, soaking the lean resin in the tailings. Slowly add the lean resin along with the tailings from the top of the adsorption column. Once the lean resin floats steadily at the top of the column, open the slurry inlet valve at the bottom of the column, allowing the slurry to enter the column at a flow rate of 230ml / min. The tailings pass through the upper screen to intercept the resin and flow into the tailings collection tank. After 40 BV of adsorption, the resin in the lower h section becomes saturated. The slurry inlet valve is closed, and the second standby valve of the resin discharge column or its connecting valve at the bottom is opened. Simultaneously, lean resin is added from the top of the adsorption column, switching the resin bed from adsorption to lean resin loading. Lean resin loading is completed by controlling the opening degree and opening time of the second standby valve or connecting valve. Once lean resin loading is complete, the second standby valve or connecting valve is closed, the resin discharge valve at the top of the resin discharge column is opened, and the slurry inlet valve is opened. The saturated resin at height h of the adsorption column is pushed out of the resin collection column along with the slurry inlet, completing the discharge and collection of saturated resin. The system transitions from lean resin loading to saturated resin discharge loading. The slurry flow rate and empty column velocity can be adjusted by controlling the diameter d of the resin adsorption column and the amount of lean resin loaded. The resin residence time is 20 min, the saturated bed volume is 40 BV, the uranium adsorption capacity of the resin is 17.6 mg / ml, and the uranium adsorption rate is 99.1%.

[0074] Example 2

[0075] Uranium was extracted from an acid-soluble mineral slurry using a certain resin. The density of the acid-soluble mineral slurry was 1.40 g / cm³. 3 The uranium content is 1.05 g / L, the resin content is 201×7, and the wet true density of the resin is 1.10 g / cm³. 3The equipment described in this invention is used for slurry adsorption. Equipment parameters: tower height 5.5m, resin filling height 5m, h = 0.5m. First, the slurry inlet valve at the bottom of the adsorption column is closed. The adsorption column is filled with 2 / 3 adsorption tailings, and the lean resin is soaked in the tailings. The lean resin, along with the tailings, is slowly added to the adsorption column from the top. Once the lean resin floats stably at the top of the adsorption column, the slurry inlet valve at the bottom of the adsorption column is opened. The slurry enters the adsorption column from the bottom at a flow rate of 110ml / min. The tailings are filtered by the upper screen to intercept the resin and flow into the tailings collection tank. After 35 BV of adsorption, the resin in the lower section (h = 0.5m) is saturated. The slurry inlet valve is then closed, and the second backup valve of the resin discharge column or its connecting valve at the bottom is opened. Simultaneously, lean resin is added from the top of the adsorption column, switching the resin bed from the adsorption process to the lean resin filling state. The lean resin filling is completed by controlling the opening degree and opening time of the second backup valve or the connecting valve. After the lean resin is fully loaded, close the second standby valve or the connecting valve, open the resin discharge valve at the top of the resin discharge column, and open the slurry inlet valve. The saturated resin at height h of the adsorption column is pushed out of the resin collection column along with the slurry inlet, completing the discharge and collection of the saturated resin. The system then transitions from a lean resin loading state to a saturated resin discharge state. The slurry flow rate and empty column linear velocity can be adjusted by controlling the diameter d of the resin adsorption column and the amount of lean resin loaded. The resin residence time is 40 min, the saturated bed volume is 35 BV, the uranium adsorption capacity of the resin is 20.8 mg / ml, and the uranium adsorption rate is 98.2%.

[0076] Example 3

[0077] Uranium was extracted from an acid-soluble mineral slurry using a certain resin. The density of the acid-soluble mineral slurry was 1.38 g / cm³. 3 The uranium content is 0.96 g / L, the resin content is 201×7, and the wet true density of the resin is 1.10 g / cm³. 3The equipment described in this invention is used for slurry adsorption. Equipment parameters: tower height 10m, resin filling height 9m, h=1m, tower diameter 0.5m. First, close the slurry inlet valve at the bottom of the adsorption column. Fill the adsorption column with 2 / 3 of the adsorption tail liquid, soak the lean resin in the tail liquid, and slowly add the lean resin along with the tail liquid from the top of the adsorption column. Once the lean resin floats steadily at the top of the adsorption column, open the slurry inlet valve at the bottom of the adsorption column. The slurry enters the adsorption column from the bottom at a flow rate of 4.7L / min. The adsorption tail liquid passes through the upper screen to intercept the resin and flows into the adsorption tail liquid collection tank. After 40 BV of adsorption, the lower resin is saturated. Close the slurry inlet valve and open the second backup valve of the resin discharge column or its bottom connecting valve. Simultaneously, add lean resin from the top of the adsorption column. The resin bed switches from the adsorption process to the lean resin filling state. The lean resin filling is completed by controlling the opening degree and opening time of the second backup valve or the connecting valve. After the lean resin is fully loaded, close the second standby valve or the connecting valve, open the resin discharge valve at the top of the resin discharge column, and open the slurry inlet valve. The saturated resin at height h of the adsorption column is pushed out of the resin collection column along with the slurry inlet, completing the discharge and collection of the saturated resin. The system then transitions from a lean resin loading state to a saturated resin discharge state. The slurry flow rate and empty column linear velocity can be adjusted by controlling the diameter d of the resin adsorption column and the amount of lean resin loaded. The resin residence time is 30 min, the saturated bed volume is 40 BV, the uranium adsorption capacity of the resin is 20.5 mg / ml, and the uranium adsorption rate is 98.8%.

[0078] The above description of the embodiments is only for the purpose of helping to understand the method and core ideas of the present invention. It should be noted that those skilled in the art can make several improvements and modifications to the present invention without departing from the principles of the present invention, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

[0079] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A device for extracting uranium from high-density acid-dissolved monazite slurry, characterized in that, include: Adsorption column and resin discharge column; The resin discharge column and the adsorption column are connected by an inclined tube that runs through the side wall; the inclined tube is inclined upward from the adsorption column end to the resin discharge column end. The top of the adsorption column is provided with a resin filling port, the upper side wall is provided with an overflow port, and the bottom is provided with a slurry inlet valve and a first standby valve. A resin discharge valve is provided at the top of the resin discharge column, a second spare valve is provided on the upper side wall, and a connecting valve is provided at the bottom.

2. The apparatus for extracting uranium from high-density acid-soluble monazite slurry according to claim 1, characterized in that, A screen is installed at the overflow outlet.

3. The apparatus for extracting uranium from high-density acid-soluble monazite slurry according to claim 1, characterized in that, The upper part of the adsorption column is funnel-shaped, with a resin filling port at the top and an overflow port on the side wall.

4. The apparatus for extracting uranium from high-density acid-soluble monazite slurry according to claim 1, characterized in that, The distance between the connection end of the inclined tube and the bottom of the adsorption column is 30-100 cm.

5. The apparatus for extracting uranium from high-density acid-dissolved monazite slurry according to claim 1, characterized in that, The adsorption column has a height of 5–10 m and a diameter of 0.3–1.0 m.

6. A method for extracting uranium from a high-density acid-soluble monazite slurry using the extraction apparatus described in any one of claims 1 to 5, characterized in that, Includes the following steps: Step S1: [The following appears to be a separate, unrelated section:] ...with a specific gravity of 1.3–1.40 g / cm³ 3 The slurry is pumped in from the bottom of the adsorption column, and the flow rate is controlled to keep the adsorption resin floating in the upper part of the tower. The adsorption tail liquid flows out from the overflow port at the top of the tower. Step S2: After the resin at the bottom of the resin bed is saturated, stop adding slurry, open the standby valve or connecting valve of the resin discharge column, and continue to fill lean resin from the top of the adsorption tower. Step S3: After the lean resin is filled, continue to add slurry. By controlling the resin discharge valve of the resin discharge column, the slurry carries the saturated resin upward along the adsorption column, and then moves into the resin discharge column through the inclined tube, and finally is discharged from the top of the resin discharge column.

7. The method for extracting uranium from high-density acid-soluble monazite slurry according to claim 6, characterized in that, In step S1, the specific gravity is 1.3–1.40 g / cm³. 3 The method for preparing the slurry is as follows: The high-density slurry containing 10%–30% high-density minerals is countercurrent thickened to separate the heavier slag with a specific gravity of 1.3–1.40 g / cm³. 3 slurry.

8. The method for extracting uranium from high-density acid-soluble monazite slurry according to claim 6, characterized in that, In step S2, the relationship between the resin loading amount, frequency, and the distance h between the inclined tube and the bottom of the adsorption column is determined according to formulas (1) to (3): Resin filling volume (ml) × 0.4 / contact time (min) = flow rate (ml / min) (1) Flow rate (ml / min) / saturated bed volume = resin packing frequency (ml / n hours) (2) h(m) = Resin filling frequency (ml / n hours) / Column cross-sectional area (m2) (3); The linear velocity of the empty tower is 5-10 m / min.

9. The method for extracting uranium from high-density acid-soluble monazite slurry according to claim 6, characterized in that, In step S3, after the saturated resin is discharged, the saturated resin is leached with a leaching agent to obtain a leaching solution and lean resin. The lean resin is then cleaned or transformed before entering the resin adsorption tower for recycling.

10. The method for extracting uranium from high-density acid-soluble monazite slurry according to claim 6, characterized in that, In step S2, the lean resin is soaked in the adsorption tail liquid and then filled from the top of the adsorption tower.

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