CN220194050U - Small-flux mixing clarifying tank and countercurrent extraction system - Google Patents

Abstract

The utility model discloses a small flux mixer-settler and countercurrent extraction system, comprising: a tank body and a stirring unit. The cell body is by 3D printing integrated into one piece, and light phase entry has been seted up to its one side, and heavy phase entry has been seted up to the opposite side. A mixer-settler is arranged between the light phase inlet and the heavy phase inlet, both the light phase inlet and the heavy phase inlet are communicated with the mixer-settler, and the stirring unit is positioned in the mixer-settler and is used for mixing the light phase raw material and the heavy phase raw material for extraction. The tank body is also provided with a light phase outlet and a heavy phase outlet, and both the light phase inlet and the heavy phase inlet are communicated with the mixing clarification stage. The light phase raw material and the heavy phase raw material respectively flow into the tank body through the light phase inlet and the heavy phase inlet, and after the light phase raw material and the heavy phase raw material are extracted by the mixing clarification stage, the obtained light phase raffinate and heavy phase raffinate respectively flow out from the light phase outlet and the heavy phase outlet. The small-flux mixing clarifying tank has good structural strength, is not easy to deform, has small volume, and is suitable for places such as a bench, a glove box, a test workbench and the like.

Description

Small-flux mixing clarifying tank and countercurrent extraction system

Technical Field

The utility model particularly relates to a small-flux mixer-settler and a countercurrent extraction system.

Background

The extraction technology is a core process in the field of post-treatment of nuclear industry, multi-stage countercurrent extraction is generally adopted to improve extraction efficiency, and the mixer-settler is widely applied to countercurrent extraction technology due to the advantages of high stage efficiency, strong operation adaptability, high operation elasticity, simple structure, simple manufacture and the like.

However, the existing mixer-settler is mostly concentrated in the treatment of high flux feed liquid, and the research on the countercurrent extraction treatment equipment of low flux feed liquid containing radioactive substances is lacking. The processing requirements are more stringent due to the small size of the small throughput mixer-settler compared to the large size mixer-settler.

The structure strength of the assembled part of the existing small-flux mixing clarifying tank is low, so that the tank body is easy to deform and the like. In view of this, there is a need for a low-throughput mixer-settler that meets the structural strength requirements.

Disclosure of Invention

The utility model aims to solve the technical problems in the prior art and provides a small-flux mixer-settler and a countercurrent extraction system, wherein the small-flux mixer-settler has better structural strength, a tank body is not easy to deform, and the forming degree is high.

According to an embodiment of the first aspect of the present utility model, there is provided a low-flux mixer-settler comprising: a tank body and a stirring unit; the tank body is integrally formed by 3D printing, a light phase inlet is formed in one side of the tank body, a heavy phase inlet is formed in the other side of the tank body, a mixing clarification stage is arranged between the light phase inlet and the heavy phase inlet, the light phase inlet and the heavy phase inlet are communicated with the mixing clarification stage, and the stirring unit is positioned in the mixing clarification stage and is used for mixing a light phase raw material and a heavy phase raw material for extraction; the tank body is also provided with a light phase outlet and a heavy phase outlet, the light phase inlet and the heavy phase inlet are communicated with the mixing clarification stage, the light phase raw material and the heavy phase raw material respectively flow into the tank body through the light phase inlet and the heavy phase inlet, and after being extracted by the mixing clarification stage, the obtained light phase raffinate and heavy phase raffinate respectively flow out from the light phase outlet and the heavy phase outlet.

Preferably, a plurality of parallel mixer-settler stages are arranged between the light phase inlet and the heavy phase inlet, the light phase inlet and the heavy phase inlet are respectively communicated with the mixer-settler stages positioned at two sides, and two adjacent mixer-settler stages are mutually communicated. The stirring units are respectively positioned in the mixing clarification stages and used for mixing the light-phase raw materials and the heavy-phase raw materials for extraction. The light phase outlet of the tank body is communicated with the mixer-settler farthest from the light phase inlet, and the heavy phase outlet of the tank body is communicated with the mixer-settler farthest from the heavy phase inlet. The light phase raw material flows into the tank body through the light phase inlet, and after all the mixed clarification level extractions are sequentially carried out, the obtained light phase raffinate flows out from the light phase outlet; the heavy phase raw material flows into the tank body through the heavy phase inlet, and after all the mixed clarification level extractions are sequentially carried out, the obtained heavy phase raffinate flows out from the heavy phase outlet.

Preferably, the mixer-settler stage comprises a first mixer-settler stage, a second mixer-settler stage and an intermediate mixer-settler stage. The first mixing and clarifying stage and the second mixing and clarifying stage are respectively positioned at two side sides of the tank body, one end of the first mixing and clarifying stage is communicated with the light phase inlet, the other end of the first mixing and clarifying stage is communicated with the heavy phase outlet, one end of the second mixing and clarifying stage is communicated with the heavy phase inlet, and the other end of the second mixing and clarifying stage is communicated with the light phase outlet. The intermediate mixer-settler stage is located between the first mixer-settler stage and the second mixer-settler stage; the light phase raw material enters from a light phase inlet and flows through a first mixing clarification stage, an intermediate mixing clarification stage and a second mixing clarification stage in sequence, and the obtained light phase raffinate flows out from a light phase outlet; the heavy phase raw material enters from the heavy phase inlet and flows through the second mixer-settler, the middle mixer-settler and the first mixer-settler in sequence, and the obtained heavy phase raffinate flows out from the heavy phase outlet.

Preferably, each of the mixer-settler stages comprises a mixing chamber, a clarifier and a phase separation chamber. The direction of the light phase inlet and the direction of the heavy phase inlet are set to be a first direction, the mixing chamber, the clarifying chamber and the phase splitting chamber are sequentially communicated along a second direction, and the second direction is perpendicular to the first direction. The liquid flow direction in the mixer-settler stage is from the mixing chamber to the phase separation chamber. The mixing, clarifying and phase splitting chambers in adjacent two of the mixer-clarifying stages are arranged in reverse order such that the liquid flow directions in adjacent two mixer-clarifying stages are reversed.

Preferably, the mixing chamber is provided with a first inlet and a second inlet, the first inlet is used for allowing light phase feed liquid to enter, the light phase feed liquid is light phase raw material or light phase raffinate extracted by the previous mixing clarification stage, the second inlet is used for allowing heavy phase feed liquid to enter, and the heavy phase feed liquid is heavy phase raw material or heavy phase raffinate extracted by the previous mixing clarification stage; the stirring unit is positioned in the mixing chamber and is used for stirring light-phase feed liquid and heavy-phase feed liquid in the mixing chamber so as to extract, the obtained mixed liquid flows into the clarification chamber and is layered in the clarification chamber, the phase separation unit is arranged in the phase separation chamber and is used for separating light phases and heavy phases in layered raffinate, the phase separation chamber is provided with a first outlet and a second outlet, the first outlet is used for allowing the light-phase raffinate to flow out, and the second outlet is used for allowing the heavy-phase raffinate to flow out.

Preferably, a separation plate is arranged between the clarifying chamber and the phase separation chamber, and extends along the width direction of the phase separation chamber and is used for separating the clarifying chamber and the phase separation chamber; the upper end of the partition plate is provided with a light phase overflow groove, the lower end of the partition plate is provided with a heavy phase circulation port, the light phase overflow groove is used for allowing light phase raffinate to enter the phase separation chamber, and the heavy phase circulation port is used for allowing heavy phase raffinate to enter the phase separation chamber.

Preferably, the phase separation unit includes a first separator located at a side near the first outlet, a second separator located at a side near the second outlet, and a third separator located between the first separator and the third separator. The partition boards extend along the length direction of the phase separation chamber, the height of the upper end of the first partition board is higher than that of the third partition board, and a circulation gap exists between the second partition board and the bottom of the phase separation chamber. The light phase overflow groove and the heavy phase circulation port are both positioned between the first partition plate and the third partition plate, and the light phase raffinate enters the phase separation chamber from the light phase overflow groove and overflows through the upper end of the first partition plate so as to flow out of the first outlet. The heavy phase raffinate enters the phase separation chamber from the heavy phase flow port, flows through the flow gap and overflows the upper end of the third partition plate, and flows out of the second outlet.

Preferably, the first inlet of the mixing chamber of the first mixer-settler stage is in communication with said light phase inlet for inflow of light phase feed. The first outlet of the phase separation chamber of the first mixer-settler is communicated with the first inlet of the mixing chamber of the intermediate mixer-settler, and the light phase raffinate which is extracted once by the first mixer-settler enters the mixing chamber of the intermediate mixer-settler to be extracted again. The second inlet of the mixing chamber of the first mixer-settler stage is communicated with the second outlet of the phase-splitting chamber of the intermediate mixer-settler stage, and the second inlet of the mixing chamber of the first mixer-settler stage is used for allowing the heavy phase raffinate extracted by the second mixer-settler stage and the intermediate mixer-settler stage to flow into the mixing chamber of the first mixer-settler stage for final extraction; and the second outlet of the phase separation chamber of the first mixing and clarifying stage is communicated with the heavy phase outlet and is used for allowing the heavy phase raffinate after final extraction to flow out of the tank body.

Preferably, the first inlet of the mixing chamber of the second mixer-settler stage is in communication with the first outlet of the phase separation chamber of the intermediate mixer-settler stage for the flow of the light phase raffinate extracted through the first mixer-settler stage and the intermediate mixer-settler stage into the mixing chamber of the second mixer-settler stage for final extraction. And the first outlet of the phase separation chamber of the second mixing and clarifying stage is communicated with the light phase outlet and is used for allowing the light phase raffinate after final extraction to flow out of the tank body. The second inlet of the mixing chamber of the second mixer-settler stage is in communication with the heavy phase inlet for inflow of heavy phase feedstock. The second outlet of the phase separation chamber of the second mixer-settler is communicated with the second inlet of the mixing chamber of the intermediate mixer-settler for the heavy phase raffinate once extracted by the second mixer-settler to enter the mixing chamber of the intermediate mixer-settler for extraction again.

Preferably, the tank body further comprises a light phase inlet cell and a heavy phase inlet cell, wherein the light phase inlet cell is positioned between the light phase inlet and the mixing chamber of the first mixer-settler stage, one end of the light phase inlet cell is communicated with the light phase inlet, the other end of the light phase inlet cell is communicated with the first inlet of the first mixer-settler stage, and the light phase inlet cell is used for temporarily storing light phase raw materials. The heavy phase inlet small chamber is positioned between the heavy phase inlet and the mixing chamber of the second mixer-settler, one end of the heavy phase inlet small chamber is communicated with the heavy phase inlet, the other end of the heavy phase inlet small chamber is communicated with the second inlet of the second mixer-settler, and the heavy phase inlet small chamber is used for temporarily storing heavy phase raw materials.

According to an embodiment of the second aspect of the present utility model, there is provided a countercurrent extraction system comprising a test bench, a light phase feed tank, a heavy phase feed tank, a light phase receiving tank, a heavy phase receiving tank, and a small flux mixer-settler as described above. The small-flux mixer-settler is installed in the test bench. The light phase feeding tank is communicated with a light phase inlet of the small flux mixer-settler and is used for feeding light phase to the small flux mixer-settler. The heavy phase feed tank is communicated with a heavy phase inlet of the small flux mixer-settler and is used for feeding heavy phase to the small flux mixer-settler. The light phase receiving tank is communicated with a light phase outlet of the small flux mixer-settler and is used for receiving light phase raffinate extracted by the small flux mixer-settler. The heavy phase receiving tank is communicated with a heavy phase outlet of the small flux mixer-settler and is used for receiving heavy phase raffinate extracted by the small flux mixer-settler.

The light phase feeding flow of the light phase inlet of the small flux mixer-settler is 2-100

The heavy phase feeding flow rate of the heavy phase inlet is 2-100 mL/min.

The small flux mixer-settler in the utility model is internally provided with a mixer-settler. The light phase raw material enters the tank body from the light phase inlet and flows through the mixing and clarifying stage, and finally flows out of the tank body from the light phase outlet. The heavy phase raw material enters the tank body from the heavy phase inlet and flows through the mixer-settler, and finally flows out of the tank body from the heavy phase outlet. The heavy phase will sink to the bottom of the tank because of its greater mass, while the light phase will flow over the heavy phase because of its lesser mass. Thus, when the stirring unit is not started, two parallel liquid flow passages are formed in the mixer-settler. When the stirring unit is started, the light phase and the heavy phase in the mixing chamber are mixed so as to realize extraction. The cell body is printed integrated into one piece by 3D. The groove body formed by 3D printing is not required to be assembled, so that the processing precision and the structural strength of the groove body are good. Therefore, the small-flux mixer-settler can stir and extract light-phase raw materials and heavy-phase raw materials, has better structural strength, and is not easy to deform.

The small-flux mixing clarifying tank has smaller and lighter volume and is particularly suitable for places with smaller space, such as a bench, a glove box, a test workbench and the like.

Drawings

FIG. 1 is a schematic diagram of a mixer-settler in some embodiments of the utility model;

FIG. 2 is a schematic flow diagram of the light phase in a mixer-settler in some embodiments of the utility model;

FIG. 3 is a schematic flow diagram of heavy phase in a mixer-settler in some embodiments of the utility model;

FIG. 4 is a schematic illustration of the mixer-settler and support structure within the glove box in accordance with some embodiments of the utility model;

FIG. 5 is a schematic diagram of a countercurrent extraction system in some embodiments of the utility model;

FIG. 6a is a schematic diagram of the structure of a mixer-settler stage in some embodiments of the utility model;

FIG. 6b is a schematic view of the divider plate in some embodiments of the present utility model;

FIG. 6c is a schematic diagram of a phase separation unit in some embodiments of the utility model.

In the figure: 1-driving unit, 2-stirring unit, 3-cell body, 4-light phase entry, 5-heavy phase entry, 6-mixing chamber, 7-phase separation chamber, 8-clarification chamber, 9-light phase entry cell, 10-heavy phase entry cell, 11-light phase export, 12-heavy phase export, 13-glove box, 14-test bench, 15-light phase feed tank, 16-heavy phase feed tank, 17-light phase receiving tank, 18-heavy phase receiving tank, 19-feed pump, 20-division board, 201-light phase overflow tank, 202-heavy phase circulation port, 21-first division board, 22-second division board, 23-third division board.

Detailed Description

The following description of the embodiments of the present utility model will be made more apparent, and the embodiments described in detail, but not necessarily all, in connection with the accompanying drawings. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to fall within the scope of the utility model.

In the description of the present utility model, it should be noted that the terms "upper" and "lower" are used "

"upstream," "downstream," and the like indicate an orientation or positional relationship based on that shown in the drawings, for convenience and simplicity of description only, and do not indicate or imply that the apparatus or elements in question must be disposed in, constructed and operated in, a particular orientation, and thus should not be construed as limiting the utility model.

In the description of the present utility model, the terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present utility model, it should be noted that, unless explicitly specified and limited otherwise, the terms "connected," "configured," "mounted," "secured," and the like are to be construed broadly and may be either fixedly connected or detachably connected, or integrally connected, for example; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model can be understood by those skilled in the art according to the specific circumstances.

Example 1

Referring to fig. 1, 2 and 3, the utility model discloses a mixer-settler, which comprises a tank body 3 and a stirring unit 2.

Wherein, the cell body is by 3D printing shaping. One side of the tank body 3 is provided with a light phase inlet 4, and the other side is provided with a heavy phase inlet 5. A mixer-settler is arranged between the light phase inlet 4 and the heavy phase inlet 5, and both the light phase inlet 4 and the heavy phase inlet 5 are communicated with the mixer-settler. The stirring unit is positioned in the mixing clarification stage and is used for mixing the light phase raw materials and the heavy phase raw materials for extraction. The tank body 3 is also provided with a light phase outlet 11 and a heavy phase outlet 12, and the light phase inlet 11 and the heavy phase inlet are both communicated with the mixing clarification stage. The light phase raw material and the heavy phase raw material respectively flow into the tank body through the light phase inlet 4 and the heavy phase inlet 5, and after the light phase raffinate and the heavy phase raffinate are extracted through the mixing clarification stage, the obtained light phase raffinate and the heavy phase raffinate respectively flow out from the light phase outlet 11 and the heavy phase outlet 12.

Specifically, a mixer-settler is arranged in the tank body of the small-flux mixer-settler. The light phase raw material enters the tank body from the light phase inlet and flows through the mixing and clarifying stage, and finally flows out of the tank body from the light phase outlet. The heavy phase raw material enters the tank body from the heavy phase inlet and flows through the mixer-settler, and finally flows out of the tank body from the heavy phase outlet. The heavy phase will sink to the bottom of the tank because of its greater mass, while the light phase will flow over the heavy phase because of its lesser mass. Thus, when the stirring unit is not started, two parallel liquid flow passages are formed in the mixer-settler. When the stirring unit is started, the light phase and the heavy phase in the mixing chamber are mixed so as to realize extraction.

Further, the light phase feeding flow rate of the mixer-settler is 2-100 mL/min, and the heavy phase feeding flow rate is 2-100 mL/min. The flux and the volume of the mixer-settler are smaller, and the mixer-settler is a small flux mixer-settler. Specifically, the size of the mixer-settler in the mixer-settler is also small, the length is 280-400 mm, the width is 40-100 mm, and the height is 80-200 mm. Therefore, the mixer-settler is particularly suitable for places with smaller space and can be used as post-treatment factory liquid-liquid extraction equipment, chemical experiment facilities, university teaching equipment and the like.

However, the current common mixer-settler is concentrated in the field of high-flux feed liquid treatment, and research on low-flux feed liquid countercurrent extraction treatment equipment containing radioactive substances is lacking. Compared with a large-size mixer-settler, the small-size mixer-settler has more strict processing requirements, and the conventional existing small-flux mixer-settler has the problems of low processing precision, easy deformation of the tank body 3 in the production process, complex assembly, poor equipment forming degree and the like. In order to solve the problems, the tank body 3 of the mixer-settler is integrally formed by 3D printing. Through the integral molding, the small-size mixing clarifying tank is free from assembly, the processing precision is high, the equipment completion degree is high, and the like, and the problems of poor production precision, complex assembly and the like of small-size equipment are solved. The small-flux mixing clarifying tank can be 3D printed by adopting stainless steel materials so as to ensure the structural strength of the small-flux mixing clarifying tank.

Therefore, the mixing and clarifying tank can stir and extract light-phase raw materials and heavy-phase raw materials, is small in size, can be suitable for occasions with narrow space, has good precision and structural strength, and is not easy to deform.

A plurality of parallel mixer-settler stages are arranged between the light phase inlet 4 and the heavy phase inlet 5, the light phase inlet 4 and the heavy phase inlet 5 are respectively communicated with the mixer-settler stages positioned at two sides, and two adjacent mixer-settler stages are mutually communicated. The stirring units 2 are multiple in number, and the stirring units 2 are respectively positioned in multiple mixer-settler stages and are used for mixing light-phase raw materials and heavy-phase raw materials for extraction. The light phase outlet 11 of the tank 3 communicates with the mixer-settler stage furthest from the light phase inlet 4, and the heavy phase outlet 12 communicates with the mixer-settler stage furthest from the heavy phase inlet 5. The light phase raw material flows into the tank body 3 through the light phase inlet 4, and after all the mixed clarification level extraction is sequentially carried out, the obtained light phase raffinate flows out from the light phase outlet 11; the heavy phase raw material flows into the tank body 3 through the heavy phase inlet 5, and after all the mixed clarification level extraction is carried out in sequence, the obtained heavy phase raffinate flows out from the heavy phase outlet 12.

Specifically, as shown in fig. 2, after the mixer-settler is started, the light phase raw material enters the tank body 3 from the light phase inlet 4, flows through each mixer-settler in turn, and finally flows out of the tank body 3 from the light phase outlet 11. In addition, as shown in fig. 3, the heavy phase feedstock enters the tank 3 from the heavy phase inlet 5 and flows through each mixer-settler stage in turn, and finally flows out of the tank 3 from the heavy phase outlet 12. The heavy phase will sink to the bottom of the tank 3 due to its relatively high mass, while the light phase will flow over the heavy phase due to its relatively low mass, so that two parallel liquid flow paths will be formed in the mixer-settler. While the stirring unit 2 in the mixing chamber 6 mixes the upper and lower light and heavy phases for extraction.

Therefore, the mixer-settler can stir and extract the light phase raw materials and the heavy phase raw materials in multiple stages, thereby producing better extraction effect.

Referring to fig. 2 and 3, in the present embodiment, the mixer-settler stage includes a first mixer-settler stage, a second mixer-settler stage, and an intermediate mixer-settler stage. Specifically, the number of intermediate mixer-settler stages is one or more. The number of intermediate mixer-settler stages is specifically determined according to the requirements of the actual extraction. In this example, the number of intermediate mixer-settler stages is one.

Further, the first mixer-settler stage and the second mixer-settler stage are located on both sides of the tank body 3, respectively. Illustratively, the first mixer-settler stage is located to the right of tank 3 and the second mixer-settler stage is located to the left of tank 3. One end of the first mixer-settler stage is communicated with the light phase inlet 4, the other end is communicated with the heavy phase outlet 12, one end of the second mixer-settler stage is communicated with the heavy phase inlet 5, and the other end is communicated with the light phase outlet 11. The intermediate mixer-settler stage is located between the first mixer-settler stage and the second mixer-settler stage. As shown in fig. 2, the light phase raw material enters from the light phase inlet 4, flows through the first mixer-settler stage, the intermediate mixer-settler stage and the second mixer-settler stage in sequence, and the obtained light phase raffinate flows out from the light phase outlet 11. As shown in fig. 3, the heavy phase raw material enters from the heavy phase inlet 5, flows through the second mixer-settler stage, the intermediate mixer-settler stage and the first mixer-settler stage in sequence, and the obtained heavy phase raffinate flows out from the heavy phase outlet 12.

Wherein each mixer-settler stage comprises a mixing chamber 6, a clarifier 8 and a phase separation chamber 7. The directions of the light phase inlet 4 and the heavy phase inlet 5 are set as a first direction, and the mixing chamber 6, the clarifying chamber 8 and the phase separation chamber 7 are sequentially communicated along a second direction, and the second direction is perpendicular to the first direction. The liquid flow in the mixer-settler stage is from the mixing chamber 6 to the phase separation chamber 7. The mixing chamber 6, the clarification chamber 8 and the phase separation chamber 7 in adjacent two mixer-settler stages are arranged in the opposite order so that the liquid flow directions in adjacent two mixer-settler stages are opposite.

Further, the mixing chamber 6 is provided with a first inlet and a second inlet, the first inlet is used for allowing light phase feed liquid to enter, and the light phase feed liquid is light phase raw material or light phase raffinate extracted by the last mixing clarification stage; the second inlet is used for feeding heavy phase feed liquid, wherein the heavy phase feed liquid is heavy phase raw material or heavy phase raffinate extracted by the last mixing clarification stage. The stirring unit 2 is located in the mixing chamber 6, and is used for stirring the light phase feed liquid and the heavy phase feed liquid in the mixing chamber 6 for extraction, and the obtained mixed liquid flows into the clarification chamber 8 and is layered in the clarification chamber 8. The phase separation chamber 7 is internally provided with a phase separation unit which is used for separating the light phase and the heavy phase in the layered raffinate. The phase separation chamber 7 is provided with a first outlet and a second outlet, wherein the first outlet is used for flowing out light phase raffinate, and the second outlet is used for flowing out heavy phase raffinate.

In order to sufficiently separate the mixed solution in the clarifier, the aspect ratio of the clarifier 8 should be set to 2 to 5. Preferably, the aspect ratio of the settling chamber 8 is set to 3. Illustratively, when the width of the clarification chamber 8 is 10mm, its length is 30mm.

In addition, as shown in fig. 1, the stirring unit 2 includes a stirring blade and a driving shaft, the driving shaft extends into the mixing chamber 6 from top to bottom, the stirring blade is mounted at the lower end of the driving shaft, and the stirring blade is located in the mixing chamber 6. Specifically, the ratio of the installation height of the stirring blade to the height of the mixing chamber 6 is 0.2 to 0.5. Preferably, the ratio of the mounting height of the stirring blade to the height of the mixing chamber 6 is 0.3, in which case the stirring blade is capable of producing a good stirring effect for the light phase and the heavy phase.

The stirring unit 2 is driven by a driving unit 1, and the driving unit 1 can be a servo motor. The motor is arranged above the tank body 3 and is connected with the driving shaft of the stirring unit 2 through an output shaft. The motor is used for driving the stirring blade to rotate, and the rotating speed range of the stirring blade is 700-1000 r/min. Preferably, the rotation speed of the stirring blade is 850r/min.

Referring to fig. 6a, 6b and 6c, in the present embodiment, a partition plate 20 is provided between the settling chamber 8 and the phase separation chamber 7, and the partition plate 20 extends in the width direction of the phase separation chamber 7 for partitioning the settling chamber 8 and the phase separation chamber 7. The upper end of the partition plate 20 is provided with a light phase overflow groove 201, and the lower end thereof is provided with a heavy phase circulation port 202. The light phase overflow tank 201 is used for allowing light phase raffinate to enter the phase separation chamber 7, and the heavy phase circulation port 202 is used for allowing heavy phase raffinate to enter the phase separation chamber 7.

Further, the phase separation unit in the phase separation chamber 7 includes a first separator 21, a second separator 22, and a third separator 23, the first separator 21 being located on a side near the first outlet, the third separator 23 being located on a side near the second outlet, the second separator 22 being located between the first separator 21 and the third separator 23. The partition plates extend along the length direction of the phase separation chamber 7, the height of the upper end of the first partition plate 21 is higher than that of the third partition plate 23, and a circulation gap exists between the second partition plate 22 and the bottom of the phase separation chamber 7. The light phase overflow tank 201 and the heavy phase flow port 202 are both positioned between the first partition 21 and the third partition 23, and the light phase raffinate enters the phase separation chamber 7 from the light phase overflow tank 201 and overflows through the upper end of the first partition 21, thereby flowing out of the first outlet. The heavy phase raffinate enters the phase separation chamber 7 from the heavy phase flow-through port 202 and flows through the flow-through gap and overflows the upper end of the third partition 23, exiting the second outlet.

Wherein, the first baffle 21, the second baffle 22 and the third baffle 23 of the phase separation unit are all integrally formed with the tank body of the mixer-settler. Therefore, the strength of the connection structure between the tank body of the mixer-settler and the phase separation unit is high, and deformation is not easy to occur.

Specifically, after the light phase and heavy phase mixed feed liquid overflows from the mixing chamber 6, clarification is performed in the clarification chamber 8, so that the feed liquid is layered: the upper layer is light phase, and the lower layer is heavy phase. After the two layers of feed liquid reach the partition plate 20, the light phase flows into the phase separation chamber 7 from the light phase overflow groove 201 above, overflows into a small chamber on the left side of the phase separation chamber 7 from the upper part of the first partition plate 21, and flows out from the first outlet. The heavy phase flows into the phase separation chamber 7 from the lower heavy phase flow port 202, flows under the second partition plate 22, then reaches the third partition plate 23 and overflows from the upper portion of the third partition plate 23, thereby achieving separation of the light phase from the heavy phase.

Referring to fig. 2 and 3, in this embodiment, adjacent mixer-settler stages are connected by a separator. The first inlet of the mixing chamber 6 of the first mixer-settler stage is in communication with the light phase inlet 4 for inflow of light phase feed. The first outlet of the phase separation chamber 7 of the first mixer-settler stage is connected to the first inlet of the mixing chamber 6 of the intermediate mixer-settler stage for the light phase raffinate once extracted through the first mixer-settler stage to enter the mixing chamber 6 of the intermediate mixer-settler stage for re-extraction.

The second inlet of the mixing chamber 6 of the first mixer-settler stage communicates with the second outlet of the phase separation chamber 7 of the intermediate mixer-settler stage for the flow of the heavy phase raffinate extracted through the second mixer-settler stage and the intermediate mixer-settler stage into the mixing chamber 6 of the first mixer-settler stage for final extraction. The second outlet of the phase separation chamber 7 of the first mixer-settler stage is connected to the heavy phase outlet 12 for the heavy phase raffinate after final extraction to flow out of the tank 3.

In addition, the first inlet of the mixing chamber 6 of the second mixer-settler stage is in communication with the first outlet of the phase separation chamber 7 of the intermediate mixer-settler stage for the light phase raffinate extracted through the first mixer-settler stage and the intermediate mixer-settler stage to flow into the mixing chamber 6 of the second mixer-settler stage for final extraction. The first outlet of the phase separation chamber 7 of the second mixer-settler stage is connected to the light phase outlet 11 for the light phase raffinate after final extraction to flow out of the tank 3. The second inlet of the mixing chamber 6 of the second mixer-settler stage is connected to the heavy phase inlet 5 for inflow of heavy phase feed. The second outlet of the phase separation chamber 7 of the second mixer-settler stage is connected to the second inlet of the mixing chamber 6 of the intermediate mixer-settler stage for the heavy phase raffinate once extracted through the second mixer-settler stage to enter the mixing chamber 6 of the intermediate mixer-settler stage for re-extraction.

With continued reference to fig. 2 and 3, the tank 3 further includes a light phase inlet cell 9 and a heavy phase inlet cell 10. The light phase inlet small chamber 9 is positioned between the light phase inlet 4 and the mixing chamber 6 of the first mixer-settler, one end of the light phase inlet small chamber is communicated with the light phase inlet 4, the other end of the light phase inlet small chamber is communicated with the first inlet of the first mixer-settler, and the light phase inlet small chamber 9 is used for temporarily storing light phase raw materials. The heavy phase inlet chamber 10 is located between the heavy phase inlet 5 and the mixing chamber 6 of the second mixer-settler stage, one end of which is in communication with the heavy phase inlet 5 and the other end of which is in communication with the second inlet of the second mixer-settler stage, the heavy phase inlet chamber 10 being used for temporary storage of heavy phase raw materials.

The working principle of the mixer-settler will be described with reference to fig. 2 and 3: when the mixer-settler is started, the light phase raw material enters the light phase inlet chamber 9. The stirring vanes in the mixing chamber 6 of the first mixer-settler stage are rotated to generate a negative pressure, so that the light phase raw material in the light phase inlet chamber 9 can be continuously sucked into the mixing chamber 6 of the first mixer-settler stage. Simultaneously, the heavy phase feed enters the heavy phase inlet cell 10. The stirring blades in the mixing chamber 6 of the second mixer-settler stage are rotated to create a negative pressure which continuously sucks the heavy phase raw material in the heavy phase inlet chamber 10 into the mixing chamber 6 of the second mixer-settler stage. The light phase flows from the light phase inlet 4 to the light phase outlet 11 and the heavy phase flows from the heavy phase inlet 5 to the heavy phase outlet 12.

After a period of time, the light phase and the heavy phase flow through each mixer-settler, and at this time, the light phase and the heavy phase are stirred by the stirring device in the mixing chamber 6 to complete extraction.

Each mixer-settler stage is internally provided with a mixing chamber 6, a clarifier 8 and a phase separation chamber 7, the light phase is required to be extracted for three times before reaching a light phase outlet 11, and the heavy phase is required to be extracted for three times before reaching a heavy phase outlet 12. Therefore, the light phase and the heavy phase are extracted for multiple times, and finally, a better extraction effect can be achieved.

Example 2

Referring to fig. 5, the present utility model also discloses a countercurrent extraction system, which comprises a test bench 14, a light phase feed tank 15, a heavy phase feed tank 16, a light phase receiving tank 17, a heavy phase receiving tank 18, and a small flux mixer-settler in example 1.

Wherein a small flux mixer-settler is mounted in the test bench 14. The light phase feed tank 15 is communicated with the light phase inlet 4 of the small flux mixer-settler for feeding light phase to the small flux mixer-settler. The heavy phase feed tank 16 is in communication with the heavy phase inlet 5 of the small flux mixer-settler for feeding the small flux mixer-settler with heavy phase. The light phase receiving tank 17 is communicated with the light phase outlet 11 of the small flux mixer-settler and is used for receiving the light phase raffinate after the extraction of the small flux mixer-settler. The heavy phase receiving tank 18 is in communication with the heavy phase outlet 12 of the small flux mixer-settler for receiving the heavy phase raffinate after extraction from the small flux mixer-settler.

Further, the present countercurrent extraction system also includes a feed pump 19. The number of feed pumps 19 is two, one feed pump 19 being used for transporting the light phase feed in the light phase feed tank 15 to the light phase inlet 4 and the other feed pump 19 being used for transporting the heavy phase feed in the heavy phase feed tank 16 to the heavy phase inlet 5.

Specifically, the two feed pumps are used for quantitatively feeding the light phase inlet and the heavy phase inlet respectively. The light phase feeding flow rate of the light phase inlet of the small flux mixer-settler is 2-100 mL/min, and the heavy phase feeding flow rate of the heavy phase inlet is 2-100 mL/min.

In this embodiment, this countercurrent extraction system is applicable to multistage countercurrent extraction test teaching application, and with little flux mixer-settler and corresponding feed tank, receiving tank fixed on same test bench 14 in nonradioactive environment, convenient teaching explanation and test operation satisfy teaching application demand.

In other embodiments, as shown in FIG. 4, the small flux mixer-settler of the present countercurrent extraction system can also be used in a radioactive environment. When the present countercurrent extraction system is applied to a radioactive environment, it is necessary to install the mixer-settler in the glove box 13 or the hot room. Specifically, the tank body 3 of the mixer-settler is accommodated in the glove box 13 and fixed to a stand. The drive means are then mounted outside the top end of the glove box 13/hot chamber. The countercurrent extraction system in the embodiment is suitable for the post-treatment engineering extraction process and the radioactive experiment, and the small-flux mixer-settler is placed in the hot chamber or the glove box 13 under the radioactive environment, so that the countercurrent extraction system has simple structural arrangement and convenient operation, and can meet the use requirements of the radioactive environment.

In conclusion, the countercurrent extraction system has the advantages of simple structure, small occupied space and better extraction effect.

It is to be understood that the above embodiments are merely illustrative of the application of the principles of the present utility model, but not in limitation thereof. Various modifications and improvements may be made by those skilled in the art without departing from the spirit and substance of the utility model, and are also considered to be within the scope of the utility model.

Claims (12)

1. A low-flux mixer-settler, comprising: a tank body (3) and a stirring unit (2);

the tank body is integrally formed by 3D printing, one side of the tank body (3) is provided with a light phase inlet (4), the other side is provided with a heavy phase inlet (5),

a mixer-settler is arranged between the light phase inlet (4) and the heavy phase inlet (5), the light phase inlet (4) and the heavy phase inlet (5) are communicated with the mixer-settler,

the stirring unit is positioned in the mixing clarification stage and is used for mixing the light-phase raw materials and the heavy-phase raw materials for extraction;

the tank body (3) is also provided with a light phase outlet (11) and a heavy phase outlet (12), the light phase inlet (4) and the heavy phase inlet are both communicated with the mixing clarification stage,

the light phase raw material and the heavy phase raw material respectively flow into the tank body through the light phase inlet (4) and the heavy phase inlet (5), and after mixed clarification level extraction, the obtained light phase raffinate and heavy phase raffinate respectively flow out of the light phase outlet (11) and the heavy phase outlet (12).

2. The low-throughput mixer-settler according to claim 1, characterized in that a plurality of mixer-settler stages are arranged in parallel between the light phase inlet (4) and the heavy phase inlet (5), the light phase inlet (4) and the heavy phase inlet (5) being in communication with mixer-settler stages located on both sides, respectively, adjacent two mixer-settler stages being in communication with each other,

the stirring units (2) are multiple in number, the stirring units (2) are respectively positioned in the multiple mixer-settler stages and are used for mixing the light-phase raw materials and the heavy-phase raw materials for extraction,

the light phase outlet (11) of the tank body (3) is communicated with the mixer-settler farthest from the light phase inlet (4), the heavy phase outlet (12) is communicated with the mixer-settler farthest from the heavy phase inlet (5),

the light phase raw material flows into the tank body through the light phase inlet (4), and after all the mixed clarification level extractions are sequentially carried out, the obtained light phase raffinate flows out from the light phase outlet (11); the heavy phase raw material flows into the tank body through the heavy phase inlet (5), and after all the mixed clarification level extractions are sequentially carried out, the obtained heavy phase raffinate flows out from the heavy phase outlet (12).

3. The low-throughput mixer-settler of claim 2, wherein said mixer-settler stages comprise a first mixer-settler stage, a second mixer-settler stage and an intermediate mixer-settler stage,

the first mixer-settler and the second mixer-settler are respectively positioned at two sides of the tank body (3), one end of the first mixer-settler is communicated with the light phase inlet (4), the other end of the first mixer-settler is communicated with the heavy phase outlet (12), one end of the second mixer-settler is communicated with the heavy phase inlet (5), the other end of the second mixer-settler is communicated with the light phase outlet (11),

the intermediate mixer-settler stage is located between the first mixer-settler stage and the second mixer-settler stage;

the light phase raw material enters from a light phase inlet (4) and flows through a first mixing clarification stage, an intermediate mixing clarification stage and a second mixing clarification stage in sequence, and the obtained light phase raffinate flows out from a light phase outlet (11);

the heavy phase raw material enters from the heavy phase inlet (5), flows through the second mixer-settler, the middle mixer-settler and the first mixer-settler in sequence, and the obtained heavy phase raffinate flows out from the heavy phase outlet (12).

4. The low-throughput mixer-settler of claim 2, characterized in that each of said mixer-settler stages comprises a mixing chamber (6), a clarifier (8) and a phase separation chamber (7),

the direction of the light phase inlet and the direction of the heavy phase inlet are set to be a first direction, the mixing chamber (6), the clarifying chamber (8) and the phase splitting chamber (7) are sequentially communicated along a second direction, the second direction is perpendicular to the first direction,

the liquid flow direction in the mixer-settler stage is from the mixing chamber (6) to the phase-splitting chamber (7),

the mixing chamber (6), the clarification chamber (8) and the phase separation chamber (7) in adjacent two of said mixer-clarification stages are arranged in reverse order such that the liquid flow directions in adjacent two mixer-clarification stages are opposite.

5. The low-throughput mixer-settler of claim 4, characterized in that the mixing chamber (6) is provided with a first inlet for the entry of light phase feed liquid, which is light phase feed or light phase raffinate from a previous mixer-settler extraction, and a second inlet for the entry of heavy phase feed liquid, which is heavy phase feed or heavy phase raffinate from a previous mixer-settler extraction;

the stirring unit (2) is positioned in the mixing chamber (6) and is used for stirring the light-phase feed liquid and the heavy-phase feed liquid in the mixing chamber (6) to extract, the obtained mixed liquid flows into the clarifying chamber (8) and is layered in the clarifying chamber (8),

a phase separation unit is arranged in the phase separation chamber (7) and is used for separating the light phase and the heavy phase in the layered raffinate,

the phase separation chamber (7) is provided with a first outlet and a second outlet, the first outlet is used for allowing light phase raffinate to flow out, and the second outlet is used for allowing heavy phase raffinate to flow out.

6. The small-flux mixer-settler according to claim 5, characterized in that a partition plate (20) is provided between said clarifier chamber (8) and said phase separation chamber (7), said partition plate (20) extending in the width direction of said phase separation chamber (7) for partitioning said clarifier chamber (8) and said phase separation chamber (7);

the upper end of the partition plate (20) is provided with a light phase overflow groove (201), the lower end of the partition plate is provided with a heavy phase circulation port (202), the light phase overflow groove (201) is used for allowing light phase raffinate to enter the phase separation chamber (7), and the heavy phase circulation port (202) is used for allowing heavy phase raffinate to enter the phase separation chamber (7).

7. The small flux mixer-settler according to claim 6, characterized in that said phase separation unit comprises a first partition (21), a second partition (22) and a third partition (23), said first partition (21) being located at a side close to said first outlet, said third partition (23) being located at a side close to said second outlet, said second partition (22) being located between said first partition (21) and said third partition (23),

the partition boards extend along the length direction of the phase separation chamber (7), the height of the upper end of the first partition board (21) is higher than that of the third partition board (23), a circulation gap exists between the second partition board (22) and the bottom of the phase separation chamber (7),

the light phase overflow groove (201) and the heavy phase circulating port (202) are positioned between the first partition board (21) and the third partition board (23), and light phase raffinate enters the phase separation chamber (7) from the light phase overflow groove (201) and overflows through the upper end of the first partition board (21) so as to flow out of the first outlet;

the heavy phase raffinate enters the phase separation chamber (7) from the heavy phase flow-through port (202) and flows through the flow-through gap and overflows the upper end of the third partition (23) to flow out of the second outlet.

8. The low-throughput mixer-settler of claim 5, characterized in that the first inlet of the mixing chamber (6) of the first mixer-settler stage is in communication with said light phase inlet (4) for inflow of light phase raw materials,

the first outlet of the phase separation chamber (7) of the first mixer-settler is communicated with the first inlet of the mixing chamber of the intermediate mixer-settler, and is used for allowing the light phase raffinate which is extracted once by the first mixer-settler to enter the mixing chamber (6) of the intermediate mixer-settler so as to be extracted again;

the second inlet of the mixing chamber (6) of the first mixer-settler stage is communicated with the second outlet of the phase separation chamber of the intermediate mixer-settler stage for the flow of the heavy phase raffinate extracted by the second mixer-settler stage and the intermediate mixer-settler stage into the mixing chamber (6) of the first mixer-settler stage for final extraction;

the second outlet of the phase separation chamber (7) of the first mixer-settler stage is communicated with the heavy phase outlet (12) and is used for the heavy phase raffinate after final extraction to flow out of the tank body (3).

9. The low-throughput mixer-settler of claim 8, characterized in that the first inlet of the mixing chamber (6) of the second mixer-settler stage is in communication with the first outlet of the phase separation chamber of the intermediate mixer-settler stage for the light phase raffinate extracted through the first mixer-settler stage and the intermediate mixer-settler stage to flow into the mixing chamber (6) of the second mixer-settler stage for final extraction;

the first outlet of the phase separation chamber (7) of the second mixing and clarifying stage is communicated with the light phase outlet (11) and is used for allowing the light phase raffinate after final extraction to flow out of the tank body (3);

a second inlet of the mixing chamber (6) of the second mixer-settler stage is connected to the heavy phase inlet (5) for inflow of heavy phase feed,

the second outlet of the phase separation chamber (7) of the second mixer-settler is communicated with the second inlet of the mixing chamber of the intermediate mixer-settler for the heavy phase raffinate once extracted by the second mixer-settler to enter the mixing chamber (6) of the intermediate mixer-settler for extraction again.

10. The low-flux mixer-settler according to claim 8, characterized in that the tank body (3) further comprises a light phase inlet cell (9) and a heavy phase inlet cell (10),

the light phase inlet small chamber (9) is positioned between the light phase inlet (4) and the mixing chamber (6) of the first mixer-settler, one end of the light phase inlet small chamber is communicated with the light phase inlet (4), the other end of the light phase inlet small chamber is communicated with the first inlet of the first mixer-settler, and the light phase inlet small chamber (9) is used for temporarily storing light phase raw materials;

the heavy phase inlet small chamber (10) is positioned between the heavy phase inlet (5) and the mixing chamber (6) of the second mixer-settler, one end of the heavy phase inlet small chamber is communicated with the heavy phase inlet (5), the other end of the heavy phase inlet small chamber is communicated with the second inlet of the second mixer-settler, and the heavy phase inlet small chamber (10) is used for temporarily storing heavy phase raw materials.

11. A countercurrent extraction system comprising a test bench (14), a light phase feed tank (15), a heavy phase feed tank (16), a light phase receiving tank (17), a heavy phase receiving tank (18) and a low throughput mixer-settler according to any one of claims 1-10,

the small-flux mixer-settler is installed in the test bench (14),

the light phase feeding tank (15) is communicated with a light phase inlet (4) of the small flux mixer-settler and is used for feeding light phase to the small flux mixer-settler;

the heavy phase feeding trough (16) is communicated with a heavy phase inlet (5) of the small flux mixer-settler and is used for feeding heavy phase to the small flux mixer-settler;

the light phase receiving tank (17) is communicated with a light phase outlet (11) of the small flux mixer-settler and is used for receiving light phase raffinate after the extraction of the small flux mixer-settler;

the heavy phase receiving tank (18) is communicated with the heavy phase outlet (12) of the small flux mixer-settler and is used for receiving heavy phase raffinate after the extraction of the small flux mixer-settler.

12. The countercurrent extraction system according to claim 11, wherein the light phase feed flow rate of the light phase inlet of the small flux mixer-settler is 2-100 mL/min and the heavy phase feed flow rate of the heavy phase inlet is 2-100 mL/min.