Barium carbonate preparation system and preparation method

Abstract

The invention relates to a barium carbonate preparation system and method.The preparation system comprises a pre-reaction tank and a carbonization unit, the lower end of the pre-reaction tank is connected with a liquid storage tank, the liquid storage tank is used for containing a product obtained after barium sulfide and water are mixed, and at least one carbon dioxide distributor is arranged in the pre-reaction tank; the carbon dioxide distributor is connected with a gas source, the gas source is used for containing carbon dioxide gas, the upper end of the pre-reaction tank is connected with a feeding port of the carbonization unit, the feeding port of the carbonization unit is further connected with a discharging pipe, and a first valve is arranged on the discharging pipe. According to the preparation system, the preparation efficiency of barium carbonate can be improved, and barium carbonate crystals with more uniform granularity can be obtained; the preparation system disclosed by the invention has the advantage of relatively ideal chemical reaction effect.

Description

Technical Field

[0001] The invention belongs to the technical field of barium carbonate preparation, and particularly relates to a barium carbonate preparation system and a preparation method. Background Art

[0002] Barium carbonate is an indispensable inorganic functional alkaline earth metal material in the modern national economy and science and technology field. It is recognized as an important strategic functional material and is mainly used in the manufacture of various electronic components such as PTC thermistors, ceramic coatings, optical glass, electronic ceramics, pottery, capacitors, etc. In the preparation process of barium carbonate, traditional reaction devices have problems such as poor reaction effect, low efficiency, uneven particle size distribution, easy clogging and difficult cleaning. In order to solve these problems and improve the production quality and efficiency of barium carbonate, a barium carbonate preparation system is urgently needed. Summary of the invention

[0003] In order to solve all or part of the above problems, the purpose of the present invention is to provide a barium carbonate preparation system and preparation method. The barium carbonate preparation system of the present invention can obtain barium carbonate crystals with uniform particle size distribution, thereby improving the quality and production efficiency of barium carbonate.

[0004] According to one aspect of the present invention, a barium carbonate preparation system is provided, comprising a pre-reaction tank and a carbonization unit, wherein the lower end of the pre-reaction tank is connected to a liquid storage tank, wherein the liquid storage tank is used to contain a product of a mixture of barium sulfide and water, wherein at least one carbon dioxide distributor is arranged in the pre-reaction tank, wherein the carbon dioxide distributor is connected to a gas source, wherein the gas source is used to contain carbon dioxide gas, wherein the upper end of the pre-reaction tank is connected to a feed port of a carbonization unit, wherein the feed port of the carbonization unit is also connected to a discharge pipe, wherein a first valve is arranged on the discharge pipe; wherein the carbonization unit comprises a plurality of carbonization towers arranged in sequence, wherein a plurality of stirring units are fixedly connected to the outer wall of each of the carbonization towers, wherein a stirring shaft of each of the stirring units extends into the carbonization tower, wherein a stirring blade is fixedly connected to the end of each of the stirring shafts, and for any of the carbonization towers, the angle between the axis of each of the stirring shafts and the horizontal plane is an acute angle, and the end of each of the stirring shafts is arranged toward the bottom of the carbonization tower.

[0005] Furthermore, the carbon dioxide distributor includes a distributor body, the distributor body having an annular closed cavity, the distributor body being provided with a through hole, the distributor body being connected to the gas source through the through hole so that the gas in the gas source can enter the closed cavity; the distributor body is provided with a plurality of air outlet holes, the carbon dioxide gas in the distributor body enters the pre-reaction tank through the air outlet holes; the through hole of the distributor body is connected to one end of the first connecting pipe, and the other end of the first connecting pipe is connected to the gas source.

[0006] Furthermore, the pre-reaction tank includes a straight pipe section in the middle, an upper reducing pipe section and a lower reducing pipe section, wherein the upper reducing pipe section is a tapered section that gradually increases from top to bottom to a diameter equal to the straight pipe section, and the lower reducing pipe section is a tapered section that gradually increases from bottom to top to a diameter equal to the straight pipe section, the lower end of the lower reducing pipe section is connected to the liquid storage tank, and the upper end of the upper reducing pipe section is connected to the feed port of the carbonization unit.

[0007] Furthermore, the ratio of the maximum pipe diameter to the minimum pipe diameter of the upper reducing pipe section and the lower reducing pipe section is 8:5; and the ratio of the height of the straight pipe section to the pipe diameter of the straight pipe section is 50:11.

[0008] Furthermore, the upper end of the pre-reaction tank is connected to a first connecting pipe, the first connecting pipe is connected to the feed port of the carbonization unit, and a first regulating valve is provided on the first connecting pipe; the lower end of the pre-reaction tank is connected to the liquid storage tank through a second connecting pipe, and a second regulating valve and a water pump are provided on the second connecting pipe.

[0009] Furthermore, for any one of the carbonization towers, the acute angle between the axis of each stirring shaft and the horizontal plane is 10 degrees.

[0010] Furthermore, for any one of the carbonization towers, two of the stirring units are fixedly connected thereto, the projections of the stirring axes of the two stirring units in the horizontal plane are parallel to each other, and the angle between the axis of each stirring axis and the vertical plane is 10 degrees.

[0011] Furthermore, the upper end of the pre-reaction tank is connected to the feed port of each of the carbonization towers, and the feed port of each of the carbonization towers is also connected to the discharge pipe. The gas outlet of each stage of the carbonization tower except the last stage is respectively connected to the feed port of the carbonization tower behind it, and the gas outlet of the last stage of the carbonization tower is connected to a gas collection pipe.

[0012] Furthermore, the gas outlet of each stage of the carbonization tower is respectively connected to one end of a tee, the other end of each tee is respectively connected to the gas collecting pipe through a second connecting pipe, each of the second connecting pipes is provided with a second valve, the third end of each tee is respectively connected to one end of a third connecting pipe, the other end of the third connecting pipe corresponding to the last stage of the carbonization tower is connected to the feed port of the first stage of the carbonization tower, the other end of the third connecting pipe corresponding to each of the carbonization towers except the last stage is respectively connected to the feed port of the carbonization tower behind it, and the third connecting pipe is provided with a third valve.

[0013] The present invention also provides a method for preparing barium carbonate, using any one of the preparation systems described above, the preparation method comprising the following steps:

[0014] The product obtained by mixing barium sulfide and water in the liquid storage tank is introduced into a pre-reaction tank, and carbon dioxide gas is introduced into the pre-reaction tank through a gas source, so that the carbon dioxide gas contacts the barium hydroxide through a carbon dioxide distributor and undergoes a pre-reaction to obtain a crystal nucleus;

[0015] The pre-reacted crystal nuclei are introduced into the carbonization unit, so that the crystal nuclei grow into barium carbonate crystals in the carbonization unit.

[0016] It can be seen from the above technical solution that the barium carbonate preparation system provided by the present invention has the following beneficial effects:

[0017] It has the advantage of high efficiency. Through optimized structural design and precise component configuration, it can quickly and effectively carry out the pre-reaction process of barium carbonate preparation. The carbon dioxide distributor ensures the uniform distribution of carbon dioxide, and the upper and lower variable diameter pipeline design makes the material flow more reasonable, greatly improving the reaction efficiency.

[0018] It has the advantage of strong stability. The coordinated work of the regulating valve, water pump, motor and other components ensures the stability of the device operation, can accurately control the inflow and outflow of materials, ensures the stable progress of the pre-reaction process, and thus improves the stability of product quality.

[0019] It has the advantages of energy saving and environmental protection. The system can make full use of carbon dioxide and barium hydroxide to react in the pre-reaction process, reducing resource waste. At the same time, reasonable structural design also reduces energy consumption and meets the requirements of energy saving and environmental protection.

[0020] It has the advantage of being easy to clean: not easy to clog, easy to clean, reducing equipment maintenance costs and improving production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 A schematic diagram of a barium carbonate preparation system according to an embodiment of the present invention;

[0022] Figure 2 It is a schematic diagram of the pre-reaction tank part of an embodiment of the present invention;

[0023] Figure 3 It is a schematic diagram of the arrangement of the stirring rod part and the stirring motor part in the vertical plane;

[0024] Figure 4 It is a schematic diagram of the arrangement of the stirring rod part and the stirring motor part in the horizontal plane;

[0025] The reference numerals in the figure are: pre-reaction tank 01, carbonization tower 02, discharge pipe 03, first valve 04, second connecting pipe 05, gas collection pipe 06, second valve 07, third connecting pipe 08, third valve 09, carbon dioxide distributor 010, first connecting pipe 011, first regulating valve 012, first connecting pipe 013, liquid storage tank 014, second connecting pipe 015, second regulating valve 016, water pump 017, motor 018, stirring unit 019, stirring shaft 020, stirring blade 021. DETAILED DESCRIPTION

[0026] In order to better understand the purpose, structure and function of the present invention, the barium carbonate preparation system and preparation method of the present invention are further described in detail below in conjunction with the accompanying drawings.

[0027] like Figure 1-Figure 2 As shown, a barium carbonate preparation system of an embodiment of the present invention is shown, including a pre-reaction tank 01 and a carbonization unit, the lower end of the pre-reaction tank 01 is connected to a liquid storage tank 014, the liquid storage tank 014 is used to contain a product of a mixture of barium sulfide and water, at least one carbon dioxide distributor 010 is arranged in the pre-reaction tank 01, the carbon dioxide distributor 010 is connected to a gas source, the gas source is used to contain carbon dioxide gas, the upper end of the pre-reaction tank 01 is connected to a feed port of the carbonization unit, the feed port of the carbonization unit is also connected to a discharge pipe 03, and a first valve 04 is arranged on the discharge pipe 03.

[0028] like Figure 3 As shown, the carbonization unit includes several carbonization towers arranged in sequence, and several stirring units 019 are fixedly connected to the outer wall of each carbonization tower. The stirring shaft 020 of each stirring unit 019 extends into the carbonization tower 02, and the end of each stirring shaft 020 is fixedly connected to a stirring blade 021. For any carbonization tower 02, the angle between the axis of each stirring shaft 020 and the horizontal plane is an acute angle, and the end of each stirring shaft 020 is arranged toward the bottom of the carbonization tower 02.

[0029] The stirring blade 021 of this embodiment is used to ensure sufficient contact between gas and liquid, and the downward inclined setting of the stirring shaft ensures the stability of the entire stirring transmission, overcoming the problem of easy wear of the bearings between the stirring shaft and the carbonization tower 02 in the prior art, and the problem of easy leakage of the stirring shaft and the carbonization tower part, wherein the wear of the bearings between the stirring shaft and the carbonization tower 02 in the prior art is mainly reflected in the groove ball and retaining frame of the bearing.

[0030] In one embodiment, if Figure 3 As shown, for any carbonization tower 02, the acute angle between the axis of each stirring shaft thereon and the horizontal plane is 10 degrees.

[0031] In one embodiment, if Figure 4 As shown, for any carbonization tower 02, two stirring units are fixedly connected thereto, the projections of the stirring axes of the two stirring units in the horizontal plane are parallel to each other, and the angle between the axis of each stirring axis and the vertical plane is 10 degrees.

[0032] The barium carbonate preparation system of the embodiment of the present invention includes a pre-reaction tank 01 and a carbonization unit, wherein at least one carbon dioxide distributor 010 is arranged in the pre-reaction tank 01, and the carbon dioxide distributor 010 is connected to a gas source, and the gas source is filled with carbon dioxide gas; the pre-reaction tank 01 is connected to a liquid storage tank 014, and the liquid storage tank 014 is filled with barium sulfide and water. After the barium sulfide and water are mixed, barium hydroxide and barium hydrosulfide are obtained. The barium carbonate prepared in this embodiment uses a barium hydroxide solution.

[0033] During the specific preparation, the barium hydroxide solution enters the pre-reaction tank 01, and the carbon dioxide enters the pre-reaction tank 01 through the carbon dioxide distributor 010. After the barium hydroxide solution contacts the carbon dioxide, it starts to react to generate crystal nuclei. Subsequently, the material in the pre-reaction tank 01 enters the carbonization unit, and the crystal nuclei grow into barium carbonate crystals in the carbonization unit.

[0034] The carbon dioxide distributor 010 of this embodiment is configured to allow the carbon dioxide gas to fully contact with the barium hydroxide solution, so that the two can be pre-reacted quickly to obtain crystal nuclei.

[0035] The preparation system of this embodiment can improve the preparation efficiency of barium carbonate and can obtain barium carbonate crystals with more uniform particle size; the preparation system of this embodiment has the advantage of relatively ideal chemical reaction effect.

[0036] Finally, since the system for preparing barium carbonate in this embodiment needs to consume carbon dioxide, and the process of preparing barium carbonate will produce hydrogen sulfide gas, the preparation system of this embodiment can also be used to purify the prepared hydrogen sulfide gas, that is, to reduce the content of carbon dioxide gas in the hydrogen sulfide gas. During the specific purification, the gas source is used to contain the hydrogen sulfide gas to be purified, and the liquid in the liquid storage tank 014 remains unchanged. The principle of purification is to use barium hydroxide solution to absorb carbon dioxide gas in hydrogen sulfide gas, and the process of hydrogen sulfide purification can also achieve barium carbonate precipitation.

[0037] Among them, the carbon dioxide distributor 010 includes a distributor body, which has an annular closed cavity. The distributor body is provided with a through hole, and the distributor body is connected to the gas source through the through hole so that the gas in the gas source can enter the closed cavity; the distributor body is provided with a plurality of air outlet holes, and the carbon dioxide gas in the distributor body enters the pre-reaction tank 01 through the air outlet holes.

[0038] In this embodiment, the gas in the gas source enters the closed cavity through the through hole on the distributor body, and the gas in the closed cavity enters the pre-reaction tank 01 through the gas outlet hole. The arrangement of the gas outlet hole in this embodiment enables carbon dioxide to be evenly distributed in the pre-reaction tank 01, so that the carbon dioxide gas is fully in contact with the barium hydroxide solution. In specific implementation, for example, two distributor bodies are arranged in the pre-reaction tank 01, and each distributor body is provided with 8-10 small holes.

[0039] The through hole of the distributor body is connected to one end of the first connecting pipe 011, and the other end of the first connecting pipe 011 is connected to the gas source. When two distributor bodies are arranged in the pre-reactor 01, the two distributor bodies can be connected to one end of the first connecting pipe 011 through a tee. The first connecting pipe 011 is preferably DN20.

[0040] Among them, the pre-reaction tank 01 includes a straight pipe section in the middle, an upper reducing pipe section and a lower reducing pipe section, wherein the upper reducing pipe section is a tapered section that gradually increases from top to bottom to a diameter equal to the straight pipe section, and the lower reducing pipe section is a tapered section that gradually increases from bottom to top to a diameter equal to the straight pipe section. The lower end of the lower reducing pipe section is connected to the liquid storage tank 014, and the upper end of the upper reducing pipe section is connected to the feed port of the carbonization unit.

[0041] The structural design of the pre-reaction tank 01 in this embodiment ensures that the material has a suitable residence time in the pre-reaction tank 01, which is conducive to the full progress of the reaction.

[0042] The ratio of the maximum diameter to the minimum diameter of the upper and lower reducer sections is 8:5; the ratio of the height of the straight section to the diameter of the straight section is 50:11. In specific implementation, for example, the height of the straight section is preferably 1 to 2 meters, and the diameter is preferably DN200 to DN250; the upper reducer section is preferably DN130-DN160, and the lower reducer section is preferably DN100-DN120.

[0043] The upper end of the pre-reaction tank 01 is connected with a first connecting pipe 013 , the first connecting pipe 013 is connected with a feed inlet of the carbonization unit, and a first regulating valve 012 is arranged on the first connecting pipe 013 .

[0044] The first regulating valve 012 of this embodiment is used to realize the conduction or cutoff between the pre-reaction tank 01 and the carbonization unit. When the first regulating valve 012 is opened, the material in the pre-reaction tank 01 can enter the carbonization unit to continue the carbonization reaction. When the first regulating valve 012 is closed, the material in the pre-reaction tank 01 cannot enter the carbonization unit. In specific implementation, the first regulating valve 012 is preferably DN150-DN160.

[0045] The lower end of the pre-reaction tank 01 is connected to the liquid storage tank 014 via a second connecting pipe 015 , and a second regulating valve 016 and a water pump 017 are provided on the second connecting pipe 015 .

[0046] The second regulating valve 016 of this embodiment is used to realize the conduction or cutoff between the pre-reaction tank 01 and the liquid storage tank 014. When the second regulating valve 016 is opened, the liquid in the liquid storage tank 014 can enter the pre-reaction tank 01. When the second regulating valve 016 is closed, the liquid in the liquid storage tank 014 cannot enter the pre-reaction tank 01. In specific implementation, the second regulating valve 016 is preferably DN100-DN110. The water pump 017 is used to pump the liquid in the liquid storage tank 014 to the pre-reaction tank 01. The water pump 017 is driven by the motor 018, and the power of the motor 018 is preferably 15kw.

[0047] In specific implementation, the flow rate of the liquid is 90m 3 / h-120m 3 / h, carbon dioxide flow rate is 200m 3 / h-230m 3 / h.

[0048] Among them, the carbonization unit includes several carbonization towers 02 arranged in sequence, the upper end of the pre-reaction tank 01 is connected to the feed port of each carbonization tower 02, and the feed port of each carbonization tower 02 is also connected to the discharge pipe 03. The gas outlet of each carbonization tower 02 except the last stage is respectively connected to the feed port of the carbonization tower 02 behind it, and the gas outlet of the last stage carbonization tower 02 is connected to the gas collection pipe 06.

[0049] The configuration of this embodiment realizes full utilization of carbon dioxide gas, that is, carbon dioxide gas flowing out of the gas outlet of each carbonization tower 02 except the last stage enters the carbonization tower 02 behind it through the feed port of the carbonization tower 02 behind it. At the same time, this embodiment also realizes the collection of hydrogen sulfide gas through the gas collection pipe 06.

[0050] Specifically, taking the three-stage carbonization tower 02 as an example, the gas outlet of the first-stage carbonization tower 02 is connected to the feed inlet of the second-stage carbonization tower 02, so the carbon dioxide gas overflowing from the gas outlet of the first-stage carbonization tower 02 can enter the second-stage carbonization tower 02 again, and so on. The gas outlet of the last-stage carbonization tower 02 is connected to the gas collection pipe 06.

[0051] Among them, the gas outlet of each stage of the carbonization tower 02 is respectively connected to one end of a tee, the other end of each tee is respectively connected to the gas collection pipe 06 through the second connecting pipe 05, each second connecting pipe 05 is provided with a second valve 07, the third end of each tee is respectively connected to one end of a third connecting pipe 08, the other end of the third connecting pipe 08 corresponding to the last stage of the carbonization tower 02 is connected to the feed port of the first stage of the carbonization tower 02, the other end of the third connecting pipe 08 corresponding to each carbonization tower 02 except the last stage is respectively connected to the feed port of the carbonization tower 02 behind it, and the third connecting pipe 08 is provided with a third valve 09.

[0052] The arrangement of this embodiment enables the gas in each stage of the carbonization tower 02 to be collected through the gas collection pipe 06. The arrangement of this embodiment enables the gas discharged from the gas outlet of the last stage of the carbonization tower 02 to also enter the first stage of the carbonization tower 02.

[0053] For the preparation of barium carbonate, the bulk density of barium carbonate increased from 0.6-0.7 g / mL to 0.8-0.85 g / mL after the pre-reaction tank 01 was set and the pre-reaction tank 01 was not set. When the same weight of barium carbonate products were packed in the same packaging bag, the height of the packaging bag was shortened by 10-15 cm after the pre-reaction tank 01 was set, thereby reducing the transportation cost. Therefore, the barium carbonate preparation system of this embodiment can obtain barium carbonate products with smaller particle sizes, reducing the transportation cost.

[0054] The preparation system of this embodiment can improve the preparation efficiency of barium carbonate and can obtain barium carbonate crystals with more uniform particle size; the preparation system of this embodiment has the advantage of relatively ideal chemical reaction effect.

[0055] When using the barium carbonate preparation system of this embodiment to prepare barium carbonate, first start the motor 018, and the motor 018 drives the water pump 017 to pump the liquid in the liquid storage tank 014 into the pre-reaction tank 01. At the same time, carbon dioxide enters the distributor body through the first connecting pipe 011. The air outlet on the distributor body allows carbon dioxide to be evenly dispersed in the pre-reaction tank 01 in the form of tiny bubbles. The liquid fully contacts the carbon dioxide bubbles during the rising process, a chemical reaction occurs, and crystal nuclei begin to form. Due to the special design of the pre-reaction tank 01, the material has enough residence time in the pre-reaction tank 01, and the reaction can be fully carried out; when the pre-reaction is completed, the first regulating valve 012 at the upper end is opened, and the material is pumped into the carbonization tower 02 for the next step of reaction. After the preparation system has been running for a period of time, the first regulating valve 012 and the second regulating valve 016 can be closed to clean the pre-reaction tank 01. Due to the reasonable structure of the pre-reaction tank 01, the cleaning process is convenient and quick, and it is not easy to be blocked.

[0056] The preparation system of the embodiment of the present invention has the advantage of high efficiency. Through optimized structural design and precise component configuration, the pre-reaction process of preparing barium carbonate can be carried out quickly and effectively; the carbon dioxide distributor ensures uniform distribution of carbon dioxide, and the upper and lower variable diameter pipeline design makes the material flow more reasonable, greatly improving the reaction efficiency.

[0057] The preparation system of the embodiment of the present invention has the advantage of strong stability. The coordinated work of components such as the regulating valve, water pump and motor ensures the stability of the device operation, can accurately control the inflow and outflow of materials, ensures the stable progress of the pre-reaction process, and thus improves the stability of product quality.

[0058] The preparation system of the embodiment of the present invention has the advantages of energy saving and environmental protection. The system can fully utilize carbon dioxide and barium hydroxide to react during the pre-reaction process, reducing resource waste. At the same time, the reasonable structural design also reduces energy consumption, meeting the requirements of energy saving and environmental protection.

[0059] The preparation system of the embodiment of the present invention has the advantage of being easy to clean: not easy to be blocked, easy to clean, reducing equipment maintenance costs and improving production efficiency.

[0060] The embodiment of the present invention further provides a method for preparing barium carbonate, using any one of the preparation systems described above, the preparation method comprising the following steps:

[0061] The product obtained by mixing barium sulfide and water in the liquid storage tank is introduced into a pre-reaction tank, and carbon dioxide gas is introduced into the pre-reaction tank through a gas source, so that the carbon dioxide gas contacts the barium hydroxide obtained by mixing barium sulfide and water through a carbon dioxide distributor and reacts to obtain a crystal nucleus;

[0062] The pre-reacted crystal nuclei are introduced into the carbonization unit, so that the crystal nuclei grow into barium carbonate crystals in the carbonization unit.

[0063] For the process of passing the product obtained by mixing barium sulfide and water in the liquid storage tank into the pre-reaction tank, the flow rate of the liquid is 90m 3 / h-120m 3 / h. For the process of introducing carbon dioxide gas into the pre-reaction tank through the gas source, the flow rate of carbon dioxide is 200m 3 / h-230m 3 / h.

[0064] It should be noted that, unless otherwise specified, the technical terms or scientific terms used in this application should have the common meanings understood by those skilled in the art to which the present invention belongs.

[0065] In addition, the terms "one", "two", etc. are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. In the description of the present invention, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0066] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0067] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention, and they should all be included in the scope of the claims and specification of the present invention. In particular, as long as there is no structural conflict, the various technical features mentioned in each embodiment can be combined in any way. The present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A barium carbonate preparation system, characterized in that: It includes a pre-reaction tank and a carbonization unit, the lower end of the pre-reaction tank is connected to a liquid storage tank, the liquid storage tank is used to hold a product of a mixture of barium sulfide and water, at least one carbon dioxide distributor is arranged in the pre-reaction tank, the carbon dioxide distributor is connected to a gas source, the gas source is used to hold carbon dioxide gas, the upper end of the pre-reaction tank is connected to a feed port of the carbonization unit, the feed port of the carbonization unit is also connected to a discharge pipe, and a first valve is arranged on the discharge pipe; the carbonization unit includes a plurality of carbonization towers arranged in sequence, each of the carbonization towers is fixedly connected to a plurality of stirring units on its outer wall, the stirring shaft of each stirring unit extends into the carbonization tower, the end of each stirring shaft is fixedly connected to a stirring blade, and for any one of the carbonization towers, the angle between the axis of each stirring shaft and the horizontal plane is an acute angle, and the end of each stirring shaft is arranged toward the bottom of the carbonization tower.

2. The barium carbonate preparation system according to claim 1, characterized in that: The carbon dioxide distributor includes a distributor body, which has an annular closed cavity. A through hole is provided on the distributor body, and the distributor body is connected to the gas source through the through hole so that the gas in the gas source can enter the closed cavity; a plurality of air outlet holes are provided on the distributor body, and the carbon dioxide gas in the distributor body enters the pre-reaction tank through the air outlet holes; the through hole of the distributor body is connected to one end of the first connecting pipe, and the other end of the first connecting pipe is connected to the gas source.

3. The barium carbonate preparation system according to claim 1, characterized in that: The pre-reaction tank includes a straight pipe section in the middle, an upper reducing pipe section and a lower reducing pipe section, wherein the upper reducing pipe section is a tapered section that gradually increases from top to bottom to a diameter equal to the straight pipe section, and the lower reducing pipe section is a tapered section that gradually increases from bottom to top to a diameter equal to the straight pipe section, the lower end of the lower reducing pipe section is connected to the liquid storage tank, and the upper end of the upper reducing pipe section is connected to the feed port of the carbonization unit.

4. The barium carbonate preparation system according to claim 3, characterized in that: The ratio of the maximum pipe diameter to the minimum pipe diameter of the upper reducing pipe section and the lower reducing pipe section is 8:5; the ratio of the height of the straight pipe section to the pipe diameter of the straight pipe section is 50:

11.

5. The barium carbonate preparation system according to claim 1, characterized in that: The upper end of the pre-reaction tank is connected to a first connecting pipe, the first connecting pipe is connected to the feed port of the carbonization unit, and a first regulating valve is arranged on the first connecting pipe; the lower end of the pre-reaction tank is connected to the liquid storage tank through a second connecting pipe, and a second regulating valve and a water pump are arranged on the second connecting pipe.

6. The barium carbonate preparation system according to claim 1, characterized in that: For any of the carbonization towers, the acute angle between the axis of each stirring shaft and the horizontal plane is 10 degrees.

7. The barium carbonate preparation system according to claim 6, characterized in that: For any one of the carbonization towers, two of the stirring units are fixedly connected thereto, the projections of the stirring axes of the two stirring units in the horizontal plane are parallel to each other, and the angle between the axis of each stirring axis and the vertical plane is 10 degrees.

8. The barium carbonate preparation system according to claim 1, characterized in that: The upper end of the pre-reaction tank is connected to the feed port of each of the carbonization towers, and the feed port of each of the carbonization towers is also connected to the discharge pipe. The gas outlet of each stage of the carbonization tower except the last stage is respectively connected to the feed port of the carbonization tower behind it, and the gas outlet of the last stage of the carbonization tower is connected to a gas collecting pipe.

9. The barium carbonate preparation system according to claim 8, characterized in that: The gas outlet of each stage of the carbonization tower is respectively connected to one end of a tee, the other end of each tee is respectively connected to the gas collecting pipe through a second connecting pipe, each of the second connecting pipes is provided with a second valve, the third end of each tee is respectively connected to one end of a third connecting pipe, the other end of the third connecting pipe corresponding to the last stage of the carbonization tower is connected to the feed port of the first stage of the carbonization tower, the other end of the third connecting pipe corresponding to each of the carbonization towers except the last stage is respectively connected to the feed port of the carbonization tower behind it, and the third connecting pipe is provided with a third valve.

10. A method for preparing barium carbonate, characterized in that: Using the preparation system according to any one of claims 1 to 9, the preparation method comprises the following steps: The product obtained by mixing barium sulfide and water in the liquid storage tank is introduced into a pre-reaction tank, and carbon dioxide gas is introduced into the pre-reaction tank through a gas source, so that the carbon dioxide gas contacts the barium hydroxide obtained by mixing barium sulfide and water through a carbon dioxide distributor and reacts to obtain a crystal nucleus; The pre-reacted crystal nuclei are introduced into the carbonization unit, so that the crystal nuclei grow into barium carbonate crystals in the carbonization unit.

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