Oil-water separation device for uranium extraction
By designing a staged separation device, the problem of oil and interface contaminant dispersion during uranium extraction was solved, achieving efficient oil recovery and purification of the raffinate aqueous phase, thus improving the overall efficiency and environmental friendliness of the uranium extraction process.
Patent Information
- Application Number
- CN202423099027.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-16
- Publication Date
- 2025-11-14
- Estimated Expiration
- 2034-12-16
AI Technical Summary
In existing uranium extraction processes, oil and interfacial contaminants are dispersed in the raffinate, leading to oil waste and poor purification of the raffinate aqueous phase, which affects subsequent processes.
Design a staged separation device consisting of an oil recovery stage, a clarification stage, and a raffinate aqueous phase recovery stage. The device is connected by baffles and connecting pipes to achieve deep separation of oil and water. Spatial flow and staged retention are used to improve separation efficiency.
It improves the recovery rate of oil in the raffinate, enhances the purification effect of the aqueous phase in the raffinate, reduces oil waste, and improves the production environment for subsequent processes.
Smart Images
Figure CN223548054U_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of uranium extraction equipment technology, specifically to an oil-water separation device for raffinate. Background Technology
[0002] Solvent extraction is a commonly used method for uranium extraction and purification in natural uranium production. As a common uranium extraction device, the mixing clarifier often contains trace amounts of oil (extractant) and interfacial contaminants in its raffinate (raffinate water without secondary clarification) during extraction. Without recovery, this results in significant oil loss. Therefore, an oil recovery tank (oil-water separation equipment) is often used in conjunction with the extraction process to recover trace amounts of oil from the raffinate through secondary clarification. During operation, the less dense oil and interfacial contaminants float on the surface of the raffinate water phase and accumulate at the end of the oil recovery tank as it overflows. Under this staged overflow operation, only the surface solution flows in the oil recovery tank, while most of the solution in the tank remains stagnant, resulting in extremely low equipment space utilization. Simultaneously, the oil and interfacial contaminants continuously collide and scour with the raffinate water phase during the staged overflow process, failing to achieve adequate clarification. Even after secondary clarification, the raffinate still contains a certain amount of oil and interface contaminants. This not only wastes oil but also negatively impacts other processes when the impurity-laden raffinate is returned to the production line. To address these issues, the existing oil-water separation device was optimized to improve oil recovery while simultaneously purifying the raffinate. Utility Model Content
[0003] This invention achieves deep separation of oil and aqueous phase in uranium extraction raffinate by transforming the solution flow from planar to spatial flow and simultaneously performing graded retention of oil.
[0004] The solution of this utility model is:
[0005] An oil-water separation device for uranium extraction includes an oil recovery stage, M clarification stages, and a raffinate recovery stage. Each of the oil recovery stage, clarification stage, and raffinate recovery stage is equipped with a partition to separate sub-stages. One side of the partition is provided with a liquid passage hole. The oil recovery stage, clarification stage, and raffinate recovery stage are connected sequentially by a connecting pipe.
[0006] The liquid passage holes of the internal baffles of the oil recovery stage, clarification stage, and raffinate aqueous phase recovery stage are arranged opposite each other.
[0007] The oil recovery stage has a sub-stages, where a ≥ 1 and a is an integer; the clarification stage has b sub-stages, where b ≥ 1 and b is an integer; and the raffinate aqueous phase recovery stage has c sub-stages, where c ≥ 1 and c is an integer.
[0008] The connecting pipe between the oil recovery stage and the clarification stage is located on one side of the bottom of the last sub-stage of the oil recovery stage, and the position of the connecting pipe is opposite to the liquid passage hole of the partition of the last sub-stage of the oil recovery stage.
[0009] The inlet of the connecting pipe between the clarification stage and the raffinate recovery stage is located on one side of the bottom of the last sub-stage of the clarification stage, and the position of the connecting pipe is opposite to the liquid passage hole of the partition of the last sub-stage of the clarification stage.
[0010] The number of clarification levels is M, where M ≥ 1 and M is an integer.
[0011] M clarification stages are connected in sequence by a connecting pipe. The connecting pipe is located on one side of the bottom of the last sub-stage of the Mth clarification stage, and the position of the connecting pipe is opposite to the liquid passage hole of the partition of the last sub-stage of the Mth clarification stage.
[0012] The oil recovery stage inlet is equipped with a feed buffer compartment.
[0013] The outlet of the raffinate recovery stage is equipped with a raffinate discharge port.
[0014] The outlet end of the connecting pipe is sequentially equipped with a fault flange and a buffer compartment.
[0015] The last sub-stage of the oil recovery stage, clarification stage, and raffinate recovery stage is equipped with an oil recovery compartment. The oil recovery compartment is equipped with a slider switch, and the oil recovery compartment is connected to the oil recovery stage via a pump.
[0016] The beneficial effects of this utility model are as follows:
[0017] To address the problems of poor clarification of raffinate and oil waste during uranium extraction and purification using extraction methods, this invention incorporates an oil recovery stage, a clarification stage, and a raffinate aqueous phase recovery stage. The number and size of the clarification stage and clarification sub-stage can be adjusted according to the processing volume and purification requirements to improve the efficiency and effectiveness of oil-water separation in the raffinate and increase the oil recovery rate. Attached Figure Description
[0018] Figure 1 Top view of an oil-water separation device for uranium extraction
[0019] Figure 2 A perspective view of an oil-water separation device for uranium extraction.
[0020] Among them: 1. Oil recovery stage, 2. Clarification stage, 3. Raffinate recovery stage, 4. Feed buffer compartment, 5. Oil recovery compartment, 6. Connecting pipe, 7. Fault flange, 8. Buffer compartment, 9. Liquid passage hole, 10. Raffinate phase discharge port. Detailed Implementation
[0021] The following is in conjunction with the appendix Figure 1 ,2 The present invention will be further described in detail below with reference to specific embodiments.
[0022] A uranium mine has a raffinate production of 20m³. 3 / h. The oil content in the raffinate exceeds 300 ppm. According to this scheme, an oil recovery tank with dimensions of 20 × 5 × 2 m (length × width × height) was constructed for the separation of oil and aqueous phases in the raffinate. Specifically, it consists of one oil recovery stage 1, five clarification stages 2, and one raffinate water recovery stage 3 connected together. Oil recovery stage 1 is divided into two sub-stages by partitions. The five clarification stages are divided into 22 sub-stages by partitions. The raffinate water recovery stage has one sub-stage. Each sub-stage has dimensions of 4 × 1 × 2 m (length × width × height).
[0023] Figure 1 The first two cells of the first column represent the two sub-stages of the oil recovery stage, the last three cells of the first column represent the three sub-stages of the first clarification stage, the five cells of the second column represent the five sub-stages of the second clarification stage, the five cells of the third and fourth columns represent the five sub-stages of the third and fourth clarification stages respectively, the first four cells of the fifth column represent the four sub-stages of the fifth clarification stage, and the last cell of the fifth column represents the raffinate recovery stage 3. Each sub-stage is separated by a partition, and a liquid passage hole 9 is provided on one side of the partition. The liquid passage holes 9 of each partition are arranged opposite each other, and the sub-stages are connected through the liquid passage holes 9 of the partition. In this embodiment, the liquid passage holes 9 of the partition are grid-shaped to improve the structural strength of the equipment and to create local disturbance. An inclined grid is provided in the middle of each sub-stage, and the vertical height of the grid is 0.8 meters. Figure 2 Each sub-level has tie rods on its upper surface to fix the horizontal sub-level partitions.
[0024] Oil recovery stage 1 is equipped with a raffinate feed buffer compartment 4 to reduce the disturbance of the raffinate to the precipitated oil and interfacial contaminants. The raffinate enters the device through the feed buffer compartment 4. Oil recovery stage 1, clarification stage 2, and raffinate aqueous phase recovery stage 3 are connected in sequence by a connecting pipe 6. The connecting pipe 6 connecting oil recovery stage 1 and clarification stage 2 is located on the left side of the bottom of the second sub-stage of oil recovery stage 1. The position of the connecting pipe 6 is opposite to the liquid passage hole 9 of the partition plate of the second sub-stage of oil recovery stage 1, and is located on the right side.
[0025] Five clarification stages 2 are connected sequentially by connecting pipes 6. The inlet of connecting pipe 6 is located on one side of the bottom of the last sub-stage of the current clarification stage 2 (0.1m vertically from the bottom, as described below as "bottom"). The position of connecting pipe 6 is opposite to the liquid passage hole 9 of the partition of the last sub-stage of the current clarification stage 2. The outlet of connecting pipe 6 is located at the top of the first sub-stage of the next clarification stage 2 (0.4m vertically from the top, as described below as "top"). The inlet of connecting pipe 6 between the fifth clarification stage 2 and the raffinate recovery stage 3 is located to the left of the bottom of the last sub-stage of the fifth clarification stage 2. The outlet of connecting pipe 6 is located at the top of the raffinate recovery stage 3. The position of connecting pipe 6 is opposite to the liquid passage hole 9 of the partition of the last sub-stage of the clarification stage 2. This achieves a zigzag flow of the raffinate in this device. Finally, the clarified raffinate is discharged from the raffinate discharge port 10 on the right side of the raffinate recovery stage 3.
[0026] A fault flange 7 is installed at the outlet end of the connecting pipe 6. In case of abnormal conditions, a blind flange can be installed to isolate the connection between the two stages, or if a failure occurs in a stage, a temporary pipeline can be used to bypass it and continue operation. A buffer compartment 8 is installed at the outlet of the connecting pipe 6 to reduce the disturbance of the solution to the oil and interface contaminants that have precipitated in the next stage.
[0027] The oil recovery stage 1, five clarification stages 2, and raffinate aqueous phase recovery stage 3 are all equipped with an oil recovery compartment 5. During this period, the precipitation of oil and interface contaminants in each stage is observed regularly. Before the oil accumulates to a certain amount or the interface contaminants show a tendency to clump, the sliding switch on the oil recovery compartment 5 is opened, and the oil, interface contaminants, and a portion of the raffinate are transported to the oil recovery stage 1 for further clarification. Finally, the oil is discharged from the oil recovery compartment 5 of the oil recovery stage 1 into the oil recovery tank. The oil is reused in the extraction system, and the interface contaminants are treated to render them harmless.
[0028] Using this device, at 20m 3 With a processing capacity of / h, the unit continuously processes raffinate with an oil content exceeding 300ppm, maintains stable operation, controls the oil content of the treated aqueous raffinate to within 20ppm, and achieves an oil recovery rate of 93.3%.
[0029] The above description is a field application example of an oil-water separation device for uranium extraction in a uranium mine. Any equivalent substitutions or obvious modifications made by using this device and method are within the scope of this description and should be protected by this invention.
Claims
1. An oil-water separation device for uranium extraction, characterized in that: It includes an oil recovery stage (1), M clarification stages (2), and a raffinate recovery stage (3). Each of the oil recovery stage (1), clarification stage (2), and raffinate recovery stage (3) is equipped with a partition to separate sub-stages. A liquid passage (9) is provided on one side of the partition. The oil recovery stage (1), clarification stage (2), and raffinate recovery stage (3) are connected in sequence through a connecting pipe (6).
2. The oil-water separation device for uranium extraction as described in claim 1, characterized in that: The liquid passage holes (9) on the partitions inside the oil recovery stage (1), clarification stage (2), and raffinate aqueous phase recovery stage (3) are arranged opposite to each other.
3. The oil-water separation device for uranium extraction as described in claim 1, characterized in that: The oil recovery stage (1) has a sub-stages, where a ≥ 1 and a is an integer; the clarification stage (2) has b sub-stages, where b ≥ 1 and b is an integer; and the raffinate aqueous phase recovery stage (3) has c sub-stages, where c ≥ 1 and c is an integer.
4. The oil-water separation device for uranium extraction as described in claim 2, characterized in that: The connecting pipe (6) connecting the oil recovery stage (1) and the clarifier stage (2) is located on one side of the bottom of the last sub-stage of the oil recovery stage (1), and the position of the connecting pipe (6) is opposite to the liquid passage hole (9) on the partition of the last sub-stage of the oil recovery stage (1).
5. The oil-water separation device for uranium extraction as described in claim 2, characterized in that: The connecting pipe (6) connecting the clarification stage (2) and the raffinate recovery stage (3) is located on one side of the bottom of the last sub-stage of the clarification stage (2), and the position of the connecting pipe (6) is opposite to the liquid passage hole (9) on the partition of the last sub-stage of the clarification stage (2).
6. The oil-water separation device for uranium extraction as described in claim 1, characterized in that: The number of clarification levels (2) is M, where M≥1 and M is an integer.
7. The oil-water separation device for uranium extraction as described in claim 6, characterized in that: The M clarification stages (2) are connected in sequence by a connecting pipe (6). The connecting pipe (6) is located on one side of the bottom of the last sub-stage of the Mth clarification stage (2). The position of the connecting pipe (6) is opposite to the liquid passage hole (9) on the partition of the last sub-stage of the Mth clarification stage (2).
8. The oil-water separation device for uranium extraction as described in claim 1, characterized in that: The oil recovery stage (1) is equipped with a feed buffer compartment (4) at its inlet.
9. The oil-water separation device for uranium extraction as described in claim 1, characterized in that: The outlet of the raffinate recovery stage (3) is provided with a raffinate discharge port (10); the outlet end of the connecting pipe (6) is provided with a fault flange (7) and a buffer compartment (8) in sequence.
10. The oil-water separation device for uranium extraction as described in claim 1, characterized in that: The last sub-stage of the oil recovery stage (1), clarification stage (2), and raffinate aqueous phase recovery stage (3) is equipped with an oil recovery compartment (5). A slider switch is installed on the oil recovery compartment (5). The oil recovery compartment (5) is connected to the oil recovery stage (1) via a pump.