Device and method for realizing efficient recovery of tail gas from barium slag leaching by reflux of leaching liquid

Abstract

The invention relates to the technical field of barium slag tail gas recovery, and discloses a device and method for realizing efficient recovery of barium slag leaching tail gas by reflux of leachate; the device comprises a first processing device and a second processing device; the first processing device comprises a barium slag leaching device, and a feeding device arranged above the barium slag leaching device and connected to the barium slag leaching device; the second processing device comprises a tail gas collecting device connected to the exhaust window, a leachate collecting device connected to the discharge window, and an absorption reaction device connected to the tail gas collecting device and the leachate collecting device; the method comprises: S1, feeding and mixing; S2, collecting leachate and tail gas; S3, recovering tail gas and preparing barium carbonate; the invention can efficiently absorb tail gas generated in the process of barium slag treatment, and separate barium carbonate products with application value from the barium slag.

Description

Technical Field

[0001] The invention relates to the technical field of barium slag tail gas recovery, and in particular to a device and method for realizing efficient recovery of barium slag leaching tail gas through reflux of leaching liquid. Background Art

[0002] Barium slag is the residual solid waste produced in the process of producing barium salts from barium ore. Its chemical components are mainly barium compounds such as barium sulfate, barium carbonate, barium silicate, and barium thiosulfate.

[0003] China has become the world's largest barium salt production base. Barium slag mainly contains acid-soluble barium and water-soluble barium. According to the National List of Hazardous Wastes, barium slag is a hazardous solid waste. Long-term storage not only occupies a large amount of land, but also pollutes the environment. Therefore, the harmlessness of barium slag and its comprehensive recycling are an important aspect of current research on barium slag.

[0004] The Chinese invention patent of the prior art CN114345886A provides a tail gas absorption method and device for harmless recovery and treatment of barium slag, in which clean water is mainly used to absorb and treat the tail gas generated in the barium slag treatment process. On the one hand, the clean water has limited absorption capacity for ammonia and carbon dioxide in the tail gas, and the absorption quality is poor; on the other hand, the prior art cannot effectively separate the barium carbonate in the barium slag; although barium carbonate is the main toxic substance in the barium slag, high-purity barium carbonate has a strong application value; therefore, it is necessary to provide a new technology for treating barium slag. Summary of the invention

[0005] The technical problem solved by the present invention is to efficiently absorb tail gas generated in the process of treating barium slag and separate barium carbonate products with application value from the barium slag.

[0006] The technical solution of the present invention is: a device for realizing efficient recovery of tail gas from barium slag leaching by returning the leachate, comprising a first treatment device for leaching barium slag, and a second treatment device for recovering the leachate and tail gas generated by the first treatment device;

[0007] The first processing device comprises a barium slag leaching device, a feeding device arranged above the barium slag leaching device and connected to the barium slag leaching device;

[0008] The barium slag leaching device comprises a horizontally arranged leaching reaction chamber, and a first stirring device arranged in the leaching reaction chamber;

[0009] The leaching reaction chamber comprises a reaction chamber body, exhaust windows evenly arranged on the upper surface of the reaction chamber body, and a discharge window arranged on the lower surface of the reaction chamber body; a filter interception net is arranged on the exhaust window; and an automatic hatch for sealing or opening the discharge window is arranged on the discharge window;

[0010] The second treatment device includes a tail gas collection device connected to the exhaust window, a leachate collection device connected to the discharge window, and an absorption reaction device connected to the tail gas collection device and the leachate collection device;

[0011] The absorption reaction device comprises a mounting frame, a plurality of gas-liquid mixers evenly and vertically arranged on the mounting frame, a water inlet pipe horizontally arranged at the upper end of the gas-liquid mixer and connected in series with the liquid inlet of the gas-liquid mixer, an air inlet pipe connected in series with the air inlet of the gas-liquid mixer and connected with the tail gas collection device, and an absorption reactor arranged below the gas-liquid mixer;

[0012] The water inlet pipe is connected to the leachate collecting device;

[0013] The absorption reactor comprises an absorption reaction chamber horizontally arranged below the mounting frame, a second agitator arranged in the absorption reaction chamber, a filter barrel arranged at the lower end of the absorption reaction chamber, and a drainage trough arranged at the lower end of the filter barrel;

[0014] The absorption reaction chamber is communicated with the water outlet at the lower end of the gas-liquid mixer.

[0015] Further, the gas-liquid mixer comprises an air inlet cavity connected to the air inlet pipe, a water inlet nozzle arranged at one end of the air inlet cavity, and a mixing diffuser at the other end of the air inlet cavity;

[0016] The central axes of the mixing diffuser, the air inlet cavity and the water inlet nozzle coincide with each other.

[0017] Description: The gas-liquid mixer forms negative pressure in the air inlet chamber by inletting water at a high flow rate, and uses the formed negative pressure to absorb ammonia and carbon dioxide tail gas, so that the leachate and tail gas are fully in contact, thereby ensuring that the water in the leachate and ammonia form ammonia water, and that the water and carbon dioxide form carbonic acid; further, barium carbonate is generated through the reaction of carbonic acid with barium ions in the leachate, which consumes carbonate ions and promotes the absorption of tail gas by the leachate.

[0018] Further, the exhaust gas collection device includes an air collecting hood arranged at the upper end of the filter interception net, an air extraction device arranged on the air collecting hood for generating negative pressure, and an air storage tank connected to the air extraction device;

[0019] The gas storage tank is communicated with the gas inlet of the gas-liquid mixer through an air inlet pipe.

[0020] Description: The exhaust gas formed by the reaction of ammonium chloride solution and barium slag can be extracted into the gas storage tank through the exhaust device and temporarily stored, which effectively prevents the leakage of exhaust gas.

[0021] Furthermore, the leachate collecting device comprises a barium slag filtering device arranged at the lower end of the discharge window, and a liquid storage tank connected to the barium slag filtering device.

[0022] Description: The barium slag filtering device can separate the leaching waste liquid from the barium slag, and the liquid storage tank can collect and temporarily store the leaching waste liquid, which is convenient for reacting with the tail gas after collection.

[0023] Furthermore, the barium slag filtering device includes a barium slag discharge trough arranged at the lower end of the discharge window, a leachate collection trough arranged at the lower end of the barium slag discharge trough and connected to the liquid storage tank, a filtering component arranged between the barium slag discharge trough and the leachate collection trough, and a spiral discharge component arranged in the barium slag discharge trough.

[0024] Description: The filtering component obtains leached barium slag and leached waste liquid containing barium ions by filtering the effluent, and the spiral discharge component discharges the barium slag in the barium slag discharge tank by rotation; the leaching liquid collection tank collects the leaching waste liquid containing barium ions.

[0025] Furthermore, the feeding device includes a leachate storage chamber for storing ammonium chloride, a barium slag storage chamber for storing barium slag, a feed pipe whose upper end is connected to the barium slag storage chamber and whose lower end passes through the filter interception net, and a sprayer connected to the leachate storage chamber to spray ammonium chloride solution into the feed pipe.

[0026] Description: The barium slag storage chamber contains barium slag to be treated, and the barium slag to be treated can be put into the leaching reaction chamber through the feeding pipe. The molar concentration of the ammonium chloride solution in the leaching liquid storage chamber is 0.5-4 mol / L.

[0027] Furthermore, the first stirring device includes two rotating shafts horizontally arranged in the leaching reaction chamber, stirring impellers evenly arranged on the rotating shafts, and a power device for providing power to the rotating shafts.

[0028] Description: The stirring impellers on the two rotating shafts are cross-arranged, and each stirring impeller is provided with six stirring blades; the stirring impellers can be driven by a power device to rotate, ensuring that the barium slag to be treated is in full contact with the ammonium chloride solution, so that the barium slag to be treated can fully participate in the chemical reaction.

[0029] Furthermore, the filter barrel is movably connected to the absorption reaction chamber.

[0030] Description: The filter barrel is slidably connected to the absorption reaction chamber through a sliding groove, or through a threaded connection; the filter barrel can be quickly replaced through the movable setting, so that the barium carbonate in the filter barrel can be easily taken out.

[0031] The method of a device for efficiently recovering tail gas from barium slag leaching by returning the leaching solution comprises the following steps:

[0032] S1. Feeding and mixing

[0033] The feeding device adds the barium slag to be treated into the leaching reaction chamber, and sprays the ammonium chloride solution into the leaching reaction chamber; then the first stirring device stirs the barium slag to be treated so that the barium slag to be treated is fully contacted with the ammonium chloride solution; the leached barium slag is obtained; the stirring is continued for 15 to 45 minutes; the solid-liquid ratio is 6 to 8 kg / L

[0034] S2. Collecting leachate and tail gas

[0035] The tail gas collection device collects and stores the generated ammonia and carbon dioxide through the exhaust window; then the automatic hatch opens the discharge window, and the leached barium slag enters the leaching liquid collection device under the action of gravity, and the leached barium slag is filtered and separated to obtain the leaching waste liquid containing barium ions;

[0036] S3, recovery of tail gas and preparation of barium carbonate

[0037] The tail gas collection device provides a mixed gas of ammonia and carbon dioxide to the gas-liquid mixer; the leachate collection device provides the leaching waste liquid containing barium ions to the gas-liquid mixer; the gas-liquid mixer fully mixes the mixed gas and the leaching waste liquid and then discharges them into the absorption reaction chamber, and the second stirrer stirs to obtain solid barium carbonate; then the solid barium carbonate is collected through a filter barrel and the waste water is discharged through a drainage trough; the absorption of the mixed gas of ammonia and carbon dioxide is completed and barium carbonate is obtained.

[0038] The beneficial effects of the present invention are as follows: the present invention provides a device and method for realizing efficient recovery of tail gas from leaching of barium slag by returning the leaching liquid, and the present invention can perform leaching treatment on the barium slag, so that the barium slag fully reacts with the ammonium chloride solution to obtain leaching waste liquid containing barium ions, thereby realizing the extraction of barium from the barium slag and ensuring that the toxicity of the obtained barium slag is effectively reduced;

[0039] The present invention collects the leaching waste liquid and tail gas obtained by the leaching reaction separately, effectively avoiding the tail gas from being discharged into the atmosphere and causing harm during the leaching process; the present invention absorbs the tail gas through the leaching waste liquid, and because the leaching waste liquid contains barium ions, barium carbonate is generated during the process of absorbing the tail gas, and the absorption of the tail gas is promoted, so that a barium carbonate product with higher purity can be obtained on the one hand, and the absorption efficiency of the tail gas can be improved on the other hand;

[0040] Compared with the prior art, the barium slag treatment method provided by the present invention can not only effectively treat the barium slag, but also recover the barium carbonate in the barium slag; the treatment process is environmentally friendly and can greatly reduce the emission of tail gas during the barium slag treatment process, and has strong practical application value. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1It is a schematic diagram of the overall structure of Embodiment 1 of the present invention;

[0042] Figure 2 is a schematic structural diagram of a gas-liquid mixer according to Embodiment 1 of the present invention;

[0043] Figure 3 This is a schematic diagram of the structure of the leaching reaction chamber of Example 1 of the present invention;

[0044] Figure 4 is a schematic structural diagram of an exhaust gas collection device according to Embodiment 1 of the present invention;

[0045] Figure 5 is a schematic structural diagram of a leachate collecting device according to Example 1 of the present invention;

[0046] Figure 6 is a schematic structural diagram of a feed assembly in Example 3 of the present invention;

[0047] Figure 7 is a schematic structural diagram of a first agitator in Example 4 of the present invention;

[0048] Among them, 1-slag leaching device, 10-leaching reaction chamber, 11-first stirring device, 100-reaction chamber body, 101-exhaust window, 102-discharge window, 103-filter interception net, 110-rotating shaft, 111-stirring impeller, 112-power device, 2-feeding device, 20-leaching liquid storage chamber, 21-barium slag storage chamber, 22-feeding pipe, 23-sprinkler, 3-tail gas collection device, 30-gas collection hood, 31-exhaust device, 32-gas storage tank, 4-leachate collecting device, 40-barium slag filtering device, 41-liquid storage tank, 400-barium slag discharge trough, 401-leachate collecting trough, 402-filtering assembly, 5-absorption reaction device, 50-mounting frame, 51-gas-liquid mixer, 52-water inlet pipe, 53-absorption reactor, 530-absorption reaction chamber, 531-second agitator, 532-filter barrel, 533-drainage trough, 510-air inlet chamber, 511-water nozzle, 512-mixing diffusion tube. DETAILED DESCRIPTION

[0049] Example 1

[0050] like Figure 1 The device for realizing efficient recovery of tail gas from barium slag leaching by returning the leaching solution shown comprises a first treatment device for leaching barium slag, and a second treatment device for recovering the leaching solution and tail gas generated by the first treatment device;

[0051] The first processing device comprises a barium slag leaching device 1, a feeding device 2 arranged above the barium slag leaching device 1 and connected to the barium slag leaching device 1;

[0052] The barium slag leaching device 1 comprises a horizontally arranged leaching reaction chamber 10, and a first stirring device 11 arranged in the leaching reaction chamber 10;

[0053] like Figure 3 As shown, the leaching reaction chamber 10 includes a reaction chamber body 100, exhaust windows 101 uniformly arranged on the upper surface of the reaction chamber body 100, and a discharge window 102 arranged on the lower surface of the reaction chamber body 100; a filter interception net 103 is arranged on the exhaust window 101; and an automatic hatch for sealing or opening the discharge window 102 is arranged on the discharge window 102;

[0054] The second treatment device includes a tail gas collection device 3 connected to the exhaust window 101, a leachate collection device 4 connected to the discharge window 102, and an absorption reaction device 5 connected to the tail gas collection device 3 and the leachate collection device 4;

[0055] The absorption reaction device 5 includes a mounting frame 50, a plurality of gas-liquid mixers 51 evenly and vertically arranged on the mounting frame 50, a water inlet pipe 52 horizontally arranged at the upper end of the gas-liquid mixer 51 and connected in series with the liquid inlet of the gas-liquid mixer 51, an air inlet pipe connected in series with the air inlet of the gas-liquid mixer 51 and communicating with the tail gas collection device 3, and an absorption reactor 53 arranged below the gas-liquid mixer 51;

[0056] The water inlet pipe 52 is connected to the leachate collecting device 4;

[0057] The absorption reactor 53 includes an absorption reaction chamber 530 horizontally arranged below the mounting frame 50, a second agitator 531 arranged in the absorption reaction chamber 530, a filter barrel 532 arranged at the lower end of the absorption reaction chamber 531, and a drainage trough 533 arranged at the lower end of the filter barrel 532;

[0058] The absorption reaction chamber 530 is communicated with the water outlet at the lower end of the gas-liquid mixer 51 .

[0059] like Figure 2 As shown, the gas-liquid mixer 51 includes an air inlet cavity 510 connected to the air inlet pipe, a water inlet nozzle 511 disposed at one end of the air inlet cavity 510, and a mixing diffusion pipe 512 at the other end of the air inlet cavity 510;

[0060] The central axes of the mixing diffuser 512, the air inlet cavity 510 and the water inlet nozzle 511 coincide with each other.

[0061] like Figure 4As shown, the exhaust gas collection device 3 includes an air collecting hood 30 disposed on the upper end of the filter interception net 103, an air extraction device 31 disposed on the air collecting hood 30 for generating negative pressure, and an air storage tank 32 connected to the air extraction device 31;

[0062] The gas storage tank 32 is communicated with the gas inlet of the gas-liquid mixer 51 through an air inlet pipe.

[0063] like Figure 5 As shown, the leachate collecting device 4 includes a barium slag filtering device 40 disposed at the lower end of the discharge window 102 , and a liquid storage tank 41 connected to the barium slag filtering device 40 .

[0064] The barium slag filtering device 40 includes a barium slag discharge trough 400 arranged at the lower end of the discharge window 102, a leachate collection trough 401 arranged at the lower end of the barium slag discharge trough 400 and connected to the liquid storage tank 41, a filtering component 402 arranged between the barium slag discharge trough 400 and the leachate collection trough 401, and a spiral discharge component arranged in the barium slag discharge trough 400.

[0065] Among them, the spiral discharge assembly, the vacuum device 31, the gas storage tank 32, the second agitator 531, the first agitator 11, and the feeding device 2 are all existing technology products, and the specific product models can be selected by technicians in this field according to needs.

[0066] Example 2

[0067] Based on Example 1, a method for realizing efficient recovery of tail gas from barium slag leaching by reflux of leaching solution comprises the following steps:

[0068] S1. Feeding and mixing

[0069] The feeding device 2 adds the barium slag to be treated into the leaching reaction chamber 10, and sprays the ammonium chloride solution into the leaching reaction chamber 10; then the first stirring device 11 stirs the barium slag to be treated so that the barium slag to be treated is fully contacted with the ammonium chloride solution; the leached barium slag is obtained; the stirring is continued for 15 to 45 minutes; the solid-liquid ratio is 6 to 8 kg / L;

[0070] S2. Collecting leachate and tail gas

[0071] The tail gas collection device 3 collects and stores the generated ammonia and carbon dioxide through the exhaust window 101; then the automatic hatch opens the discharge window 102, and the leached barium slag enters the leaching liquid collection device 4 under the action of gravity, and the leached barium slag is filtered and separated to obtain the leaching waste liquid containing barium ions;

[0072] S3, recovery of tail gas and preparation of barium carbonate

[0073] The tail gas collecting device 3 provides a mixed gas of ammonia and carbon dioxide to the gas-liquid mixer 51; the leachate collecting device 4 provides the leaching waste liquid containing barium ions to the gas-liquid mixer 51; the gas-liquid mixer 51 fully mixes the mixed gas and the leaching waste liquid and discharges them into the absorption reaction chamber 530, and the second stirrer 531 stirs to obtain solid barium carbonate; then the solid barium carbonate is collected by the filter barrel 532, and the waste water is discharged through the drainage trough 533; the absorption of the mixed gas of ammonia and carbon dioxide is completed and barium carbonate is obtained.

[0074] Example 3

[0075] The difference from Example 1 is:

[0076] like Figure 6 As shown, the feeding device 2 includes a leachate storage chamber 20 for storing ammonium chloride, a barium slag storage chamber 21 for storing barium slag, a feed pipe 22 whose upper end is connected to the barium slag storage chamber 21 and whose lower end passes through the filter interception net 103, and a sprayer 23 connected to the leachate storage chamber 20 for spraying ammonium chloride solution into the feed pipe 22.

[0077] The sprayer 23 adopts the existing technology product, and the specific product model can be selected by technicians in this field according to needs.

[0078] Example 4

[0079] The difference from Example 3 is that:

[0080] like Figure 7 As shown, the first stirring device 11 includes two rotating shafts 110 horizontally arranged in the leaching reaction chamber 10 , stirring impellers 111 evenly arranged on the rotating shafts 110 , and a power device 112 for providing power to the rotating shafts 110 .

[0081] The filter barrel 532 is movably connected to the absorption reaction chamber 531 .

[0082] The power device 112 adopts existing technology products, and the specific product model can be selected by technicians in this field according to needs.

Claims

1. A device for efficiently recovering tail gas from barium slag leaching by returning the leachate, characterized in that: It includes a first processing device for leaching barium slag, and a second processing device for recovering the leachate and tail gas generated by the first processing device; The first processing device comprises a barium slag leaching device (1), a feeding device (2) arranged above the barium slag leaching device (1) and connected to the barium slag leaching device (1); The barium slag leaching device (1) comprises a horizontally arranged leaching reaction chamber (10), and a first stirring device (11) arranged in the leaching reaction chamber (10); The leaching reaction chamber (10) comprises a reaction chamber body (100), exhaust windows (101) uniformly arranged on the upper surface of the reaction chamber body (100), and a discharge window (102) arranged on the lower surface of the reaction chamber body (100); a filter interception net (103) is arranged on the exhaust window (101); and an automatic hatch for sealing or opening the discharge window (102) is arranged on the discharge window (102); The second treatment device comprises an exhaust gas collection device (3) connected to the exhaust window (101), a leachate collection device (4) connected to the discharge window (102), and an absorption reaction device (5) connected to the exhaust gas collection device (3) and the leachate collection device (4); The absorption reaction device (5) comprises a mounting frame (50), a plurality of gas-liquid mixers (51) uniformly and vertically arranged on the mounting frame (50), a water inlet pipe (52) horizontally arranged at the upper end of the gas-liquid mixer (51) and connected in series to the liquid inlet of the gas-liquid mixer (51), an air inlet pipe connected in series to the air inlet of the gas-liquid mixer (51) and in communication with the tail gas collecting device (3), and an absorption reactor (53) arranged below the gas-liquid mixer (51); The water inlet pipe (52) is in communication with the leachate collecting device (4); The absorption reactor (53) comprises an absorption reaction chamber (530) horizontally arranged below the mounting frame (50), a second agitator (531) arranged in the absorption reaction chamber (530), a filter barrel (532) arranged at the lower end of the absorption reaction chamber (530), and a drainage trough (533) arranged at the lower end of the filter barrel (532); The absorption reaction chamber (530) is in communication with the water outlet at the lower end of the gas-liquid mixer (51); The gas-liquid mixer (51) comprises an air inlet cavity (510) connected to the air inlet pipe, a water inlet nozzle (511) arranged at one end of the air inlet cavity (510), and a mixing diffusion pipe (512) at the other end of the air inlet cavity (510); The central axes of the mixing diffuser (512), the air inlet cavity (510), and the water inlet nozzle (511) coincide with each other; The exhaust gas collection device (3) comprises an air collecting hood (30) arranged at the upper end of the filter interception net (103), an air extraction device (31) arranged on the air collecting hood (30) for generating negative pressure, and an air storage tank (32) connected to the air extraction device (31); The gas storage tank (32) is connected to the gas inlet of the gas-liquid mixer (51) through an air inlet pipe; The leachate collecting device (4) comprises a barium slag filtering device (40) arranged at the lower end of the discharge window (102), and a liquid storage tank (41) connected to the barium slag filtering device (40); The barium slag filtering device (40) comprises a barium slag discharge trough (400) arranged at the lower end of the discharge window (102), a leachate collection trough (401) arranged at the lower end of the barium slag discharge trough (400) and connected to the liquid storage tank (41), a filtering assembly (402) arranged between the barium slag discharge trough (400) and the leachate collection trough (401), and a spiral discharge assembly arranged in the barium slag discharge trough (400); The feeding device (2) comprises a leachate storage chamber (20) for storing ammonium chloride, a barium slag storage chamber (21) for storing barium slag, a feed pipe (22) whose upper end is connected to the barium slag storage chamber (21) and whose lower end passes through the filter interception net (103), and a sprayer (23) connected to the leachate storage chamber (20) for spraying ammonium chloride solution into the feed pipe (22).

2. The device for efficiently recovering barium slag leaching tail gas by returning the leachate according to claim 1, characterized in that: The first stirring device (11) comprises two rotating shafts (110) horizontally arranged in the leaching reaction chamber (10), stirring impellers (111) evenly arranged on the rotating shafts (110), and a power device (112) for providing power to the rotating shafts (110).

3. The device for efficiently recovering barium slag leaching tail gas by returning the leachate according to claim 1, characterized in that: The filter barrel (532) is movably connected to the absorption reaction chamber (530).

4. The method of any one of claims 1 to 3 for realizing efficient recovery of barium slag leaching tail gas by reflux of leachate, characterized in that: The following steps are involved: S1. Feeding and mixing The feeding device (2) adds the barium slag to be treated into the leaching reaction chamber (10), and sprays the ammonium chloride solution into the leaching reaction chamber (10); then the first stirring device (11) stirs the barium slag to be treated so that the barium slag to be treated is fully contacted with the ammonium chloride solution; leached barium slag is obtained; stirring is continued for 15 to 45 minutes; the solid-liquid ratio is 6 to 8 kg / L S2. Collect leachate and tail gas The tail gas collection device (3) collects and stores the generated ammonia and carbon dioxide through the exhaust window (101); then the automatic hatch opens the discharge window (102), and the leached barium slag enters the leachate collection device (4) under the action of gravity, and the leached barium slag is separated by filtration to obtain a leaching waste liquid containing barium ions; S3, recover tail gas and prepare barium carbonate The tail gas collecting device (3) provides a mixed gas of ammonia and carbon dioxide to the gas-liquid mixer (51); the leachate collecting device (4) provides the leaching waste liquid containing barium ions to the gas-liquid mixer (51); the mixed gas and the leaching waste liquid are fully mixed by the gas-liquid mixer (51) and then discharged into the absorption reaction chamber (530); the second stirrer (531) stirs to obtain barium carbonate solid; the barium carbonate solid is then collected by the filter barrel (532) and the wastewater is discharged through the drainage trough (533); the absorption of the mixed gas of ammonia and carbon dioxide is completed and barium carbonate is obtained.

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