System for reducing oil content in saponification wastewater outlet in rare earth extraction process

Abstract

The utility model relates to the technical field of saponification wastewater treatment, in particular to a system for reducing the oil content in a saponification wastewater outlet in a rare earth extraction process, which comprises a plurality of groups of saponification chambers, a separation chamber and a backflow cavity, the mixed liquid of the organic liquid and the soap liquid sequentially passes through the multiple groups of saponification chambers to realize continuous saponification, the last group of saponification chamber through which the mixed liquid flows is communicated with the separation chamber, water-oil separation is carried out, the moisture content in the organic liquid is reduced, the stability of the quality of an organic phase is kept, and meanwhile, a large amount of organic liquid is prevented from being discharged along with wastewater.

Description

Technical Field

[0001] This utility model relates to the field of saponification wastewater treatment technology, specifically to a system for reducing the oil content in the saponification wastewater outlet during rare earth extraction processes. Background Technology

[0002] Rare earth extraction and separation technology is based on countercurrent extraction separation, using a continuous extractor to remove impurities, transform, and separate mixed rare earth solutions. In production, the higher the loading rate of the organic phase onto the easily extractable components, the better the separation effect. Using alkali saponification increases the organic loading rate, but the oil content in the aqueous phase after saponification remains high (greater than 500 mg / L). Loss of the organic phase also significantly affects the saponification rate and loading rate. Therefore, maintaining the stability of the organic phase quality is the most fundamental aspect of ensuring stable production.

[0003] In current conventional processes, the system balance is maintained by frequently replenishing the organic phase. At the same time, subsequent wastewater treatment, oil removal and purification processes increase the difficulty and cost. Utility Model Content

[0004] The present invention aims to at least solve the problem of excessively high oil content in saponification wastewater in the prior art.

[0005] This solution provides a system for reducing the oil content in the saponification wastewater outlet during rare earth extraction processes, achieved through the following specific technical means: including a saponification chamber, a separation chamber, and a reflux chamber. The saponification chamber is used for the saponification reaction of organic liquid and soap solution. Multiple sets of saponification chambers are continuously distributed, so that the mixture of organic liquid and soap solution passes through multiple sets of saponification chambers in sequence to achieve continuous saponification.

[0006] The last set of saponification chambers through which the mixture flows is connected to the separation chamber. The separation chamber is equipped with multi-stage separation baffles and inclined plates. By extending the path of the mixture inside and reducing collisions, the residence time and separation efficiency of the mixture in the separation chamber are increased. An organic phase outlet is provided at the top of the end of the separation chamber, which is connected to the reflux chamber. The reflux chamber is responsible for collecting the saponified organic liquid after precipitation. An aqueous phase outlet is provided at the bottom of the end of the separation chamber for discharging the wastewater after oil removal.

[0007] Preferred technical solution 1: A submerged chamber is provided at the bottom of the saponification chamber, and the top opening of the submerged chamber is connected to the inner cavity of the saponification chamber. At the same time, an overflow port is provided at the top of the saponification chamber. The soap solution entering from the outside and the recycled organic liquid enter the submerged chamber of the first set of saponification chambers. Then, the mixture of organic liquid and soap solution overflows from the top opening of the submerged chamber of the first set of saponification chambers into the first set of saponification chambers. The mixture overflows from the top overflow port of the first set of saponification chambers into the bottom submerged chamber of the next set of saponification chambers. The mixture flows through the chambers multiple times until all saponification reactions are completed.

[0008] Preferably, the organic phase discharge port in the separation chamber is at the same height as the overflow port at the top of the saponification chamber.

[0009] Preferably, the overflow port at the top of the saponification chamber in the first group is in communication with the bottom port in the latent chamber in the next group through a continuous reaction cavity.

[0010] Preferably, the overflow port at the top of the saponification chamber in the last group is in communication with the separation chamber through a switcher, and the separation chamber is provided with multiple groups.

[0011] Preferably, the top of the saponification chamber in the first group is provided with an organic liquid inlet and a soap liquid inlet.

[0012] The above structure makes the present application have the following beneficial effects:

[0013] 1. The multiple groups of saponification chambers make the mixed liquid flow through multiple stages in sequence until all saponification reactions are completed, so that the one-time reaction input is changed into continuous feeding, thereby realizing continuous saponification.

[0014] 2. The structure of the separation chamber makes the organic phase and the aqueous phase in the saponification mixed liquid quickly separate, that is, reduces the water content in the organic liquid, maintains the stability of the quality of the organic phase, and also avoids a large amount of organic liquid from being discharged with waste water. BRIEF DESCRIPTION OF DRAWINGS

[0015] The accompanying drawings are included to provide a further understanding of the present application, and constitute a part of the specification, and are used together with the embodiments of the present application to explain the present application, and do not constitute a limitation on the present application. In the drawings:

[0016] Figure 1 It is a schematic diagram of the overall structure of the present application;

[0017] Figure 2 It is a process flow diagram of the present application;

[0018] Figure 3 It is a 1-1 sectional view of the present application;

[0019] Figure 4 It is a 2-2 sectional view of the present application.

[0020] In the drawings, 1 is a saponification chamber, 11 is a latent chamber, 12 is an overflow port, 13 is an organic liquid inlet, 14 is a soap liquid inlet, 2 is a separation chamber, 21 is an organic phase discharge port, 22 is an aqueous phase discharge port, 23 is a baffle, 24 is an inclined plate, 3 is a reflux cavity, 4 is a continuous reaction cavity, 5 is a switcher, and 51 is an electrically operated lifting bolt. DETAILED DESCRIPTION

[0021] Clearly, the described embodiments are merely a part of the embodiments of the present application, rather than all the embodiments; based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the present application.

[0022] Please refer to Figures 1-4 The system for reducing the oil content in the outlet of the saponification wastewater in a rare earth extraction process comprises a saponification chamber 1, a separation chamber 2 and a reflux cavity 3, the saponification chamber 1 is used for saponification reaction of organic liquid and soap solution, a plurality of groups of saponification chambers 1 are continuously distributed on the saponification chamber 1, so that the mixed liquid of the organic liquid and the soap solution sequentially passes through the plurality of groups of saponification chambers 1 to realize continuous saponification, ensure that the mixed liquid stays in each group of saponification chambers 1 for more than 3 minutes, and make the reaction fully proceed until all saponification reactions are completed, therefore, the saponification chamber volume L = total amount of the entering liquid m3 / min * mixing reaction time min;

[0023] An organic liquid inlet 13 and a soap solution inlet 14 are arranged at the top of the first group of saponification chambers 1, the last group of saponification chambers 1 through which the mixed liquid flows is communicated with the separation chamber 2, a baffle 23 is arranged in the separation chamber 2, after the mixed liquid hits the baffle 23, small-molecule organic liquid is gathered by collision, when reaching 10-60 microns, the baffle 23 moves upward at the same time, and the mixed liquid passes through the baffle 23 to walk in an S-shaped route, and water-oil separation is sequentially achieved to form organic phase and aqueous phase, the organic phase is the organic liquid, a slope plate 24 is arranged at the bottom of the separation chamber 2, the angle of the slope plate 24 is controlled to be 30-45 degrees, for accelerating water-oil separation, an organic phase discharge port 21 is arranged at the top of the end of the separation chamber 2, the organic phase discharge port 21 is communicated with the reflux cavity 3, the reflux cavity 3 is responsible for collecting saponified organic liquid after precipitation, the reflux cavity 3 is connected with an extraction separation production line, so that the saponified organic liquid can directly participate in the extraction reaction, and the material flow program is shortened; a water phase discharge port 22 is arranged at the bottom of the end of the separation chamber 2, for discharging the oil-removed wastewater, the water phase discharge port 22 adopts a downward-inward-upward-outward mode, to ensure the purity of the water phase, the oil content in the discharged water phase can be reduced from 500 mg / L to below 300 mg / L, the recovery rate reaches 40%, and the overall utilization rate of the organic phase can be increased to more than 95%

[0024] Please refer to Figures 1-4, the system for reducing the oil content in the saponification wastewater outlet in the rare earth extraction process, the bottom of the saponification chamber 1 is provided with a submerged chamber 11, the top of the submerged chamber 11 is communicated with the inner cavity of the saponification chamber 1, and meanwhile, the top of the saponification chamber 1 is provided with an overflow port 12, the organic phase discharge port 21 in the separation chamber 2 is at the same height as the overflow port 12 in the top of the saponification chamber 1, the saponification liquid from outside and the recycled organic liquid enter the submerged chamber 11 in the first group of saponification chambers 1, the overflow port 12 in the top of the first group of saponification chambers 1 is communicated with the bottom of the submerged chamber 11 in the next group of saponification chambers 1 through the continuous reaction cavity 4, and the mixed liquid overflowing from the overflow port 12 in the top of the previous group of saponification chambers 1 enters the submerged chamber 11 in the bottom of the next group of saponification chambers 1 through the continuous reaction cavity 4, and the mixed liquid is circulated for multiple times, and the saponification reaction is completed.

[0025] Please refer to Figures 1-4 , the system for reducing the oil content in the saponification wastewater outlet in the rare earth extraction process, the top of the last group of saponification chambers 1 is communicated with the separation chamber 2 through the switch 5, the separation chamber 2 is provided with multiple groups, the mixed liquid overflowing from the top of the last group of saponification chambers 1 is automatically distributed into different separation chambers 2 through the change of the position of the electric lifting bolt 51 in the separator, and the content volume of the separation chamber 2 is greater than 6 times the volume of the saponification chamber 1, so that the residence time of the mixed liquid is greater than 18 min.

[0026] Although the embodiments of the utility model have been shown and described, it can be understood by those skilled in the art that various changes, modifications, replacements and variations can be made to these embodiments without departing from the principles and spirits of the utility model, and the scope of the utility model is defined by the appended claims and their equivalents.

Claims

1. A system for reducing the oil content in the effluent of a saponification step in a rare earth extraction process, characterized in that it comprises: It comprises a saponification chamber (1), a separation chamber (2) and a reflux cavity (3), the saponification chamber (1) is used for saponification reaction of organic liquid and soap solution, and a plurality of groups of the saponification chamber (1) are continuously distributed so that the mixed solution of the organic liquid and the soap solution sequentially passes through the plurality of groups of the saponification chamber (1) to realize continuous saponification. The last group of the saponification chamber (1) through which the mixed solution flows is communicated with the separation chamber (2), oil-water separation is carried out in the separation chamber (2), an organic phase discharge port (21) is arranged at the end top of the separation chamber (2), the organic phase discharge port (21) is communicated with the reflux cavity (3), the reflux cavity (3) is used for collecting saponified organic liquid after precipitation, the reflux cavity (3) is connected with an extraction separation production line, and a water phase discharge port (22) is arranged at the end bottom of the separation chamber (2) and used for discharging waste water after oil removal.

2. The system for reducing the oil content in the exit of the saponification waste water in the rare earth extraction process according to claim 1, characterized in that: A baffle (23) is arranged in the separation chamber (2) to prolong the flow path of the mixed solution, increase collision, prolong the residence time of the mixed solution in the separation chamber (2) and increase separation efficiency; and an inclined plate (24) is arranged at the bottom of the separation chamber (2) to accelerate water-oil separation.

3. The system for reducing the oil content in the exit of the saponification waste water in the rare earth extraction process according to claim 2, characterized in that: A submerged chamber (11) is arranged at the bottom of the saponification chamber (1), the top of the submerged chamber (11) is communicated with the inner cavity of the saponification chamber (1), and an overflow port (12) is arranged at the top of the saponification chamber (1), mixed solution overflowing from the top overflow port (12) of the previous group of the saponification chamber (1) enters the submerged chamber (11) at the bottom of the next group of the saponification chamber (1).

4. The system for reducing the oil content in the exit of the saponification waste water in the rare earth extraction process according to claim 3, characterized in that: The organic phase discharge port (21) in the separation chamber (2) is at the same height as the top overflow port (12) of the saponification chamber (1).

5. The system for reducing the oil content in the exit of the saponification waste water in the rare earth extraction process according to claim 3, characterized in that: The overflow port (12) at the top of one group of the saponification chamber (1) is communicated with the bottom of the submerged chamber (11) in the next group of the saponification chamber (1) through a continuous reaction cavity (4).

6. The system for reducing the oil content in the exit of the saponification waste water in the rare earth extraction process according to claim 5, characterized in that: The overflow port (12) at the top of the last group of the saponification chamber (1) is communicated with the separation chamber (2) through a switch (5), the separation chamber (2) is provided with a plurality of groups, and the switch (5) is used for distributing the mixed solution into different separation chambers (2).

7. The system for reducing the oil content in the exit of the saponification waste water in the rare earth extraction process according to claim 1, characterized in that: An organic liquid inlet (13) and a soap solution inlet (14) are arranged at the top of the first group of the saponification chamber (1).

8. The system for reducing the oil content in the exit of the saponification waste water in the rare earth extraction process according to claim 1, characterized in that: The water phase discharge port (22) adopts a downward-inward-upward-outward mode.

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