Flue gas purification device for rare earth processing production line

Abstract

The utility model discloses a flue gas purification device for a rare earth processing production line, which comprises a water storage tank, an injection pump and a delivery pump, a feed liquid inlet is arranged at the top of the water storage tank, a circulating water outlet is arranged at the side part of the water storage tank, and the circulating water outlet is connected with a liquid inlet of the delivery pump through a circulating pipeline; a circulating water inlet of the injection pump is connected with a liquid outlet of the delivery pump through a circulating pipeline; a liquid inlet and a liquid outlet of the delivery pump are respectively provided with a circulating water control valve; a smoke inlet of the injection pump is connected with a smoke pipeline, and a feed liquid outlet of the injection pump is connected with the feed liquid inlet through a circulation pipeline. According to the utility model, the injection pump is used for collecting the flue gas, and the purification circulating water is contacted with the flue gas in the mixing chamber of the injection pump for purification, so that the acid / alkaline flue gas of the production system is purified and recycled.

Description

Technical Field

[0001] The utility model belongs to the field of rare earth hydrometallurgy, and in particular relates to a flue gas purification device for a rare earth processing production line. Background Art

[0002] The entire rare earth hydrometallurgical process primarily takes place in solutions and solvents. For example, the decomposition of rare earth concentrates, the separation and extraction of rare earth oxides, rare earth compounds, and individual rare earth metals utilize chemical separation processes such as precipitation, crystallization, redox, solvent extraction, and ion exchange. The rare earth hydrometallurgical extraction and separation process requires the participation of acids and bases in the production reaction. These reactions are accompanied by the generation of volatile acidic and alkaline fumes. If these corrosive gases are not promptly addressed, they can impact the production environment, equipment, and the health of operators. Furthermore, the unit consumption of these acids and bases can increase.

[0003] Application No. 202022494903.3 discloses an acid gas and ammonia absorption device. Exhaust gas moves upward, while absorption liquid is ejected from a top spray nozzle, flowing downward. The multi-layered fabric ring arrangement slows the absorption liquid flow, allowing for more complete absorption of exhaust gas and improving purification efficiency. However, the simultaneous recovery of acidic and alkaline gases for purification causes a reaction between the two gases. This secondary purification principle prevents the recovered flue gas from being reused in the production system. While this achieves flue gas purification, it fails to achieve waste gas reuse.

[0004] Application No. 202220094207.X discloses an energy-saving acid gas collection linkage system for a closed pickling room. This system utilizes a gas collection structure whereby gas enters a collection box through a gas hood and is then transferred to a neutralization box by negative pressure. The gas is then filtered through a three-stage spray structure before being discharged through a demisting layer for further use. The sprayed liquid passes through a filter screen and enters a circulating water tank for recirculation. This system has certain limitations when applied to rare earth smelting and separation production lines. The use of oily P507 as a raw material in rare earth separation operations would affect the proper operation of the nozzles described above, preventing continuous operation and requiring periodic maintenance. Utility Model Content

[0005] The purpose of the utility model is to provide a flue gas purification device for a rare earth processing production line, which adopts a jet pump to collect flue gas, purifies the flue gas by contacting purified circulating water with the flue gas in the mixing chamber of the jet pump, and realizes the purification and reuse of the acid / alkaline flue gas in the production system.

[0006] The technical solution is as follows:

[0007] The flue gas purification device of the rare earth processing production line includes: a water tank, a jet pump, and a delivery pump. The water tank is provided with a liquid inlet on the top and a circulating water outlet on the side. The circulating water outlet is connected to the liquid inlet of the delivery pump through a circulating pipeline; the circulating water inlet of the jet pump is connected to the liquid outlet of the delivery pump through a circulating pipeline, and the liquid inlet and liquid outlet of the delivery pump are respectively provided with circulating water control valves; the flue gas inlet of the jet pump is connected to the flue gas pipeline, and the liquid outlet of the jet pump is connected to the liquid inlet through the circulating pipeline; the jet pump includes: a circulating water inlet, a flue gas inlet, a diffusion mixing chamber, a mixing chamber, and a power nozzle; the circulating water inlet, the flue gas inlet, and the diffusion mixing chamber are respectively connected to the mixing chamber, the power nozzle is arranged in the circulating water inlet, the diffusion mixing chamber has a trumpet-shaped shape, and the outlet of the power nozzle is directly opposite to the inlet of the diffusion mixing chamber.

[0008] Furthermore, a supplementary water inlet is provided at the top of the water storage tank, the supplementary water inlet is connected to a supplementary input pipe, and the supplementary input pipe is provided with a supplementary water control valve.

[0009] Furthermore, the circulation pipeline on the liquid inlet side of the delivery pump is connected to a reuse output pipeline, and the reuse output pipeline is provided with a reuse water control valve.

[0010] Furthermore, a flue gas pipeline on one side of the flue gas inlet is provided with a flue gas pipeline valve.

[0011] Furthermore, a sampling pipe is provided on the side of the water tank, and a sampling valve is provided on the sampling pipe.

[0012] Furthermore, the inner diameters of the pressure diffuser and mixing chamber and the connecting end of the mixing chamber are smaller than the inner diameter of the outlet side of the pressure diffuser and mixing chamber.

[0013] Furthermore, the power nozzle includes a contraction section and a diffusion section connected to each other, and the outlet of the diffusion section faces the diffuser mixing chamber.

[0014] Furthermore, the circulating water inlet is provided with a circulating water inlet flange, and the flue gas inlet is provided with a flue gas inlet flange.

[0015] Compared with the prior art, the utility model has the following advantages:

[0016] 1. The utility model is a rare earth separation production line acid / alkaline flue gas purification and recycling device, which can purify, recycle and reuse acid / alkaline flue gas, and is particularly suitable for the treatment of acid / alkaline flue gas in the rare earth wet smelting extraction and separation production process.

[0017] This application uses a jet pump to collect flue gas. The negative pressure generated during the operation of the jet pump can draw the acid / alkaline flue gas generated in the production process into the flue gas purification and recovery device. The purified circulating water is brought into contact with the flue gas in the mixing chamber of the jet pump for purification, thereby achieving purification and reuse of the acid / alkaline flue gas.

[0018] 2. The utility model can recover acidic / alkaline substances in the flue gas, thereby reducing the cost expenditure of raw and auxiliary materials in the production system.

[0019] This application purifies acid / alkaline flue gas without adding other drugs or purification materials, and does not destroy the original acid-base properties. It only recovers the acid / alkaline substances in the flue gas based on the property of acid / alkaline flue gas being soluble in water; then, through subsequent recovery devices, the acid / alkaline recovery liquid that meets the production indicators is input into the production system to supplement the input of a part of the raw and auxiliary materials, thereby achieving the production optimization goal of reducing costs and increasing efficiency.

[0020] 3. The utility model has strong processing capacity, is easy and convenient to operate, and will not affect the overall operation of the production line.

[0021] 4. The utility model improves the working environment of the production site. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is the result principle diagram of the acid / alkaline flue gas purification and recycling device of the rare earth separation production line of the utility model;

[0023] Figure 2 It is a structural diagram of the jet pump in the utility model. DETAILED DESCRIPTION

[0024] The following description sufficiently illustrates specific embodiments of the present invention to enable those skilled in the art to practice and reproduce the same.

[0025] like Figure 1 The figure shows the structural principle diagram of the acid / alkaline flue gas purification and recycling device of the rare earth separation production line of the present invention.

[0026] The flue gas purification device of the rare earth processing production line includes: a water storage tank 1, a jet pump 2, and a delivery pump 3. The water storage tank 1 is provided with a liquid inlet 11 on the top and a circulating water outlet 12 on the side. The circulating water outlet 12 is connected to the liquid inlet of the delivery pump 3 through a circulating pipeline; the circulating water inlet 21 of the jet pump 2 is connected to the liquid outlet of the delivery pump 3 through a circulating pipeline, the flue gas inlet 22 of the jet pump 2 is connected to the flue gas pipeline, and the liquid outlet 23 of the jet pump 2 is connected to the liquid inlet 11 through a circulating pipeline.

[0027] A supplementary water inlet 13 is provided on the top of the water storage tank 1 , and the supplementary water inlet 13 is used to supplement purified water. The supplementary water inlet 13 is connected to a supplementary input pipe, and the supplementary input pipe is provided with a supplementary water control valve 14 .

[0028] The liquid inlet and liquid outlet of the delivery pump 3 are each equipped with a circulating water control valve 15. The circulating pipeline on the liquid inlet side of the delivery pump 3 is connected to a reuse output pipeline, which is equipped with a reuse water control valve 16. The flue gas pipeline on the side of the flue gas inlet 22 is equipped with a flue gas pipeline valve 17. A sampling pipeline is installed on the side of the water storage tank 1, and a sampling valve 18 is installed on the sampling pipeline.

[0029] like Figure 2 , which is a schematic structural diagram of the jet pump 2 in the present invention.

[0030] The structure of the jet pump 2 includes: a circulating water inlet 21, a flue gas inlet 22, a diffuser mixing chamber 23, a mixing chamber 24, and a power nozzle 25; the circulating water inlet 21, the flue gas inlet 22, and the diffuser mixing chamber 23 are respectively connected to the mixing chamber 24, and the inner diameters of the connecting ends of the diffuser mixing chamber 23 and the mixing chamber 24 are smaller than the distal inner diameter (outlet side inner diameter) of the diffuser mixing chamber 23; the power nozzle 26 is arranged in the circulating water inlet 21, and the outlet of the power nozzle 26 faces the diffuser mixing chamber 23.

[0031] The diffuser mixing chamber 23 has a trumpet-shaped shape, and the purified flue gas and washing liquid are sent into the water storage tank 1 by utilizing the expansion and acceleration.

[0032] The power nozzle 25 is manufactured using the principle of the Venturi effect and includes a contraction section and a diffusion section. The outlet of the diffusion section faces the pressure-diffuser mixing chamber 23 .

[0033] The circulating water inlet 21 is provided with a circulating water inlet flange for connecting to a circulating pipeline; the flue gas inlet 22 is provided with a flue gas inlet flange for connecting to a flue gas pipeline.

[0034] The implementation method focuses on describing four aspects: flue gas purification operations, sampling and spot inspection operations, purified water reuse operations, and purified water replenishment operations.

[0035] 1. Flue gas purification operation.

[0036] Open the circulating water control valve 15 and the flue gas pipeline valve 17, close the recycled water control valve 16, the make-up water control valve 14, and the sampling valve 18, and start the delivery pump 3; the purified water as a high-pressure power fluid passes through the delivery pump 3 along the circulating pipeline into the power nozzle 25 of the jet pump 2, and after being accelerated by the power nozzle 25, the purified water enters the mixing chamber 24, forming a low-pressure area in the mixing chamber 24, and the acid / alkaline flue gas of the production system is sucked into the mixing chamber 24 through the flue gas pipeline, and the purified water entrains the acid / alkaline flue gas into the diffusion mixing chamber 23; the purified water and the acid / alkaline flue gas are mixed in the diffusion mixing chamber 23 and discharged to the water storage tank 1 in the form of acid-base liquid.

[0037] In the mixing chamber 24 and the pressure-expanding mixing chamber 23 , the high-pressure power fluid (purified water) is continuously mixed with the inhaled acidic / alkaline flue gas to form an acid-alkaline solution, so that the acidic / alkaline flue gas is purified by the purified water.

[0038] The acidic flue gas and alkaline flue gas generated by the production system cannot enter the jet pump 2 at the same time, because the purified water after the acid-base neutralization reaction cannot be used for production reuse, and the water vapor generated by the reaction will affect the environment of the production site. The acidic flue gas and alkaline flue gas need to be recovered and reused separately.

[0039] 2. Sampling and spot check operations.

[0040] After running for a period of time, the sampling valve 18 is opened and the sampling operator extracts the purified water in the water storage tank 1 for inspection.

[0041] 3. Purified water reuse operations.

[0042] After checking that the purified water index meets the production demand, the reuse water control valve 16 is opened, and the purified water meeting the production demand is acted upon by the delivery pump 3, and the purified water enters the production system through the reuse output pipeline.

[0043] 4. Purified water replenishment operation.

[0044] After the purified water is reused, the reuse water control valve 16 is closed and the replenishing water control valve 14 is opened. The replenished purified water will be input into the water storage tank 1 through the replenishing input pipe to perform the purified water replenishing operation.

[0045] The terms used in this utility model are illustrative and exemplary, rather than restrictive. Since this utility model can be embodied in various forms without departing from the spirit or essence of the technical solution, it should be understood that the above embodiments are not limited to any of the foregoing details, but should be interpreted broadly within the spirit and scope of the appended claims. Therefore, all changes and modifications that fall within the scope of the claims or their equivalents are intended to be covered by the appended claims.

Claims

1. A flue gas purification device for a rare earth processing production line, characterized in that: include: A water storage tank, a jet pump, and a delivery pump. A liquid feed inlet is provided on the top of the water storage tank, and a circulating water outlet is provided on the side. The circulating water outlet is connected to the liquid inlet of the delivery pump through a circulating pipeline. The circulating water inlet of the jet pump is connected to the liquid outlet of the delivery pump through a circulating pipeline. The liquid inlet and liquid outlet of the delivery pump are respectively provided with circulating water control valves. The flue gas inlet of the jet pump is connected to the flue gas pipeline, and the liquid feed outlet of the jet pump is connected to the liquid feed inlet through a circulating pipeline. The jet pump includes: a circulating water inlet, a flue gas inlet, a diffusion mixing chamber, a mixing chamber, and a power nozzle. The circulating water inlet, the flue gas inlet, and the diffusion mixing chamber are respectively connected to the mixing chamber, and the power nozzle is arranged in the circulating water inlet. The shape of the diffusion mixing chamber is trumpet-shaped, and the outlet of the power nozzle is facing the inlet of the diffusion mixing chamber.

2. The flue gas purification device for a rare earth processing production line according to claim 1, characterized in that: A supplementary water inlet is provided on the top of the water storage tank, the supplementary water inlet is connected to a supplementary input pipe, and the supplementary input pipe is provided with a supplementary water control valve.

3. The flue gas purification device for a rare earth processing production line according to claim 1, characterized in that: The circulation pipeline on the liquid inlet side of the delivery pump is connected to a reuse output pipeline, and the reuse output pipeline is provided with a reuse water control valve.

4. The flue gas purification device for a rare earth processing production line according to claim 1, characterized in that: The flue gas pipeline on the flue gas inlet side is provided with a flue gas pipeline valve.

5. The rare earth processing production line flue gas purification device according to claim 1, characterized in that: A sampling pipe is provided on the side of the water storage tank, and a sampling valve is provided on the sampling pipe.

6. The rare earth processing production line flue gas purification device according to claim 1, characterized in that: The inner diameters of the pressure-diffusing mixing chamber and the connecting end of the mixing chamber are smaller than the inner diameter of the outlet side of the pressure-diffusing mixing chamber.

7. The rare earth processing production line flue gas purification device according to claim 1, characterized in that: The power nozzle comprises a contraction section and a diffusion section which are connected to each other, and the outlet of the diffusion section faces the diffuser mixing chamber.

8. The rare earth processing production line flue gas purification device according to claim 1, characterized in that: The circulating water inlet is provided with a circulating water inlet flange, and the flue gas inlet is provided with a flue gas inlet flange.

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