CN211436133U - Disc type feeding pipe - Google Patents
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- CN211436133U CN211436133U CN201921585710.XU CN201921585710U CN211436133U CN 211436133 U CN211436133 U CN 211436133U CN 201921585710 U CN201921585710 U CN 201921585710U CN 211436133 U CN211436133 U CN 211436133U
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Abstract
The utility model belongs to the technical field of feeding pipes, and discloses a disc type feeding pipe which is used for conveying reaction materials of a ternary precursor into a reaction kettle and comprises a feeding pipe and a discharging pipe with an annular structure; the feeding pipe is communicated with the discharging pipe; a plurality of discharge gates are opened to the inside wall of the discharge pipe. The utility model discloses a disc inlet pipe increases the velocity of flow that the material flows under the unchangeable condition of reaction material flow, changes the route that the material flows simultaneously, makes the reaction material mixture more even in shorter time and reation kettle from the reaction material that the discharge gate flows, and then improves the tap density of ternary precursor.
Description
Technical Field
The utility model belongs to the technical field of the inlet pipe, concretely relates to disk inlet pipe.
Background
The lithium ion battery gradually replaces a lead-acid battery by virtue of the advantages of stable voltage, high capacity, high energy density, less self-discharge, long cycle life, low consumption, environmental friendliness and the like, and is widely applied to the fields of electric vehicles, electric tools, mobile phones, notebook computers and the like. As a key material for determining the performance of the lithium ion battery, the development and production of the cathode material are important. The quality and the physical and chemical properties of the ternary precursor determine the performance of the anode material to a great extent.
In the preparation process of nickel-cobalt-manganese (NCM) materials, the preparation of precursors is a crucial part. The preparation methods of the NCM precursor are various, such as a solid phase method, a spray drying method, a coprecipitation method and the like, but the material prepared by the solid phase method has a large amount of impurities and uneven particle size distribution, and the spray drying has high production cost, complicated process and difficulty in large-scale production, and only the coprecipitation process has convenient operation and high product quality and is widely applied. However, the nickel-cobalt-manganese ternary precursor prepared by the existing preparation method is a sphere formed by coarse long-strip-shaped primary crystal grains, so that the specific surface area of the nickel-cobalt-manganese ternary precursor is small, and in addition, the prepared particles are not uniformly distributed and have lower tap density.
SUMMERY OF THE UTILITY MODEL
In view of this, in order to solve the problem that the product particle distribution is inhomogeneous, and tap density is lower in the current in-process that adopts coprecipitation method to prepare nickel cobalt manganese precursor material, the utility model provides a disk inlet pipe.
A disc-type feeding pipe is used for conveying a reaction material of a ternary precursor into a reaction kettle and comprises a feeding pipe and a discharging pipe with an annular structure; the feeding pipe is communicated with the discharging pipe; a plurality of discharge gates are opened to the inside wall of the discharge pipe.
Preferably, the number of the discharge ports is at least two.
Preferably, the aperture of the discharge hole is 2-10 mm.
Preferably, the discharge port is located on the reaction materials in the reaction kettle, and the vertical distance h between the discharge port and the kettle bottom of the reaction kettle satisfies: 2/17H < H <4/17H, where H is the depth of the reaction vessel.
Compared with the prior art, adopt above-mentioned scheme the beneficial effects of the utility model are that:
because the utility model has a plurality of discharge ports, under the condition that the flow of the reaction materials in the feed pipe is not changed, the materials are thinned, and the flow velocity is increased; the discharge hole is positioned on the inner side wall of the discharge pipe, so that the materials flowing out of the discharge hole are gathered towards the middle part of the discharge pipe with an annular structure, and the flowing route of the materials after flowing out is changed; that is to say, through the refinement to the material, the acceleration rate to the change of route for the reaction material that flows out from the discharge gate just can be with the more even mixture of reaction material in the reation kettle in the short time.
Drawings
FIG. 1 is a schematic structural view of a disc-type feeding pipe of the present invention;
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
A disc-type feeding pipe is used for conveying a reaction material of a ternary precursor to a reaction kettle and comprises a feeding pipe 1 and a discharging pipe 2 with an annular structure; the feeding pipe 1 is communicated with the discharging pipe 2; a plurality of discharge openings 21 are formed in the inner side wall of the discharge pipe 2.
The embodiment is provided with a plurality of discharge ports, and under the condition that the flow of the reaction materials in the feed pipe is not changed, the materials are refined, and the flow velocity is increased; the discharge hole is positioned on the inner side wall of the discharge pipe, so that the materials flowing out of the discharge hole are gathered towards the middle part of the discharge pipe with an annular structure, and the flowing route of the materials after flowing out is changed; that is to say, through the refinement to the material, the acceleration rate to the change of route for the reaction material that flows out from the discharge gate just can be with the more even mixture of reaction material in the reation kettle in the short time.
In a specific embodiment, the number of the discharge holes 21 is at least two. Since only at least two outlet openings 21 are provided, the reaction mass is accelerated.
In a specific embodiment, the aperture of the discharge port 21 is 2-10 mm, because if the aperture of the discharge port 21 is smaller than 2mm, the flow velocity of the reaction material is too large, and when the reaction material contacts with the material in the reaction kettle, the material in the reaction kettle splashes onto the kettle wall, which causes material waste; if the aperture of the discharge port 21 is larger than 10mm, the material speed is not increased obviously, and the expected effect is not achieved.
In a specific embodiment, the discharge port 21 is located above the reaction materials in the reaction kettle, and the vertical distance h between the discharge port 21 and the kettle bottom of the reaction kettle satisfies: 2/17H < H <4/17H, where H is the depth of the reaction vessel. On one hand, the reaction materials flowing out of the discharge port 21 can be fully mixed with the reaction materials in the reaction kettle, so that the flowing reaction materials are stirred to the maximum extent; another utility model is to avoid the reaction material in the reation kettle to splash to reation kettle's inside wall on to cause reaction material's waste, and then influence the product, produce property ability even.
The following examples, in conjunction with the ternary precursor preparation process, specifically illustrate the beneficial effects of the disk feed tube of the present invention.
Example 1
The embodiment provides a preparation method of a large-particle nickel-cobalt-manganese ternary precursor material, which comprises the following steps:
s1, preparing soluble nickel sulfate, cobalt sulfate and manganese sulfate into a mixed solution according to a stoichiometric ratio, wherein the molar concentration of total metal ions in the mixed solution is 1.8 mol/L;
mixing sodium hydroxide solution with deionized water according to a certain metering ratio to prepare a precipitator solution with the concentration of 2.2 mol/L; preparing an ammonia water solution with the concentration of 5.4mol/L as a complexing agent solution;
s2, adding deionized water into a reaction kettle, controlling the stirring speed at 300r/min, starting to heat to 56 ℃, adding ammonia water to adjust the ammonia water concentration of the bottom liquid in the reaction kettle to be 5.4g/L, adding sodium hydroxide solution to adjust the pH value to 11.8, introducing nitrogen into the reaction kettle for 1h while adding reaction materials, wherein the nitrogen flow is controlled to be 1m3/h；
Adding the mixed solution, the precipitator solution and the complexing agent solution in the S1 into a reaction kettle containing a base solution in a continuous feeding mode through a disc-type feeding pipe capable of refining and accelerating the feeding amount of the reaction materials, and discharging clear liquid in an overflowing mode for reaction to obtain a spherical nickel-cobalt-manganese ternary precursor;
wherein the coprecipitation reaction temperature is 56 ℃, the pH value of the coprecipitation reaction is 10.2-11.0, and the concentration of the complexing agent in the reaction kettle is 5.4 g/L;
s3, directly aging the spherical nickel-cobalt-manganese precursor obtained in the step S2 in a reaction kettle for 2 hours, pumping the spherical nickel-cobalt-manganese precursor into a centrifuge by a pump, centrifugally washing the spherical nickel-cobalt-manganese precursor with 1 wt% of sodium hydroxide solution at 60 ℃ until the pH value is 7.8, and drying the spherical nickel-cobalt-manganese precursor at 150 ℃ to obtain dry spherical nickel-cobalt-manganese precursor material particles.
The disc-type feeding pipe in the present embodiment, as shown in fig. 1, includes a feeding pipe 1 and a discharging pipe 2 of a ring structure; the feeding pipe 1 is communicated with the discharging pipe 2; the inner side wall of the discharge pipe 2 is provided with 8 discharge ports 21, and the aperture of each discharge port 21 is 10 mm;
after reaction material flowed from discharge gate 21, reaction material assembles towards 2 middle parts of annular structure's discharging pipe, because reaction material's flow is unchangeable, so the velocity of flow of the reaction material who flows from discharge gate 21 increases, and increased the area of contact of the reaction material in reaction kettle from the reaction material that discharge gate 21 flowed, and the reaction material that just finally can make discharge gate 21 flow mixes more evenly with the reaction material in the reaction kettle in the short time.
In addition, opening discharge gate 21 at the inside wall of discharging pipe 2 can also avoid reaction mass deposit in discharging pipe 2, makes the material obtain a bigger degree of supersaturation, tends to the nucleation process.
In addition, in the present embodiment, the discharge port 21 is located between the baffle and the stirring paddle in the reaction kettle, and the vertical distance H between the discharge port 21 and the kettle bottom of the reaction kettle is 3/17H, where H is the depth of the reaction kettle; on one hand, the reaction materials flowing out of the discharge port 21 can be fully mixed with the reaction materials in the reaction kettle, so that the flowing reaction materials are stirred to the maximum extent; another utility model is to avoid the reaction material in the reation kettle to splash to reation kettle's inside wall on to cause reaction material's waste, and then influence the product, produce property ability even.
In the preparation process in this embodiment, a scanning electron microscope is used for sampling to detect the primary particles, and the result shows that the primary particles prepared by the preparation method of this embodiment have uniform particle size distribution, are spindle-shaped, have a length of 1.2 μm, and have a thickness of 0.2 μm.
The large-particle nickel-cobalt-manganese precursor material prepared by the preparation method of the embodiment is detected to have a chemical molecular formula of Ni0.7Co0.1Mn0.2(OH)2Scanning electron microscope detection is carried out on the large-particle nickel-cobalt-manganese precursor material, and the result shows that the nickel-cobalt-manganese precursor material is of a spherical structure and is uniform in particle size distribution; as can be seen from the particle size distribution test, D50 of the Ni-Co-Mn precursor material of this example is 11.2 μm, which illustrates the product of this exampleThe prepared large-particle nickel-cobalt-manganese ternary precursor material is compact in crystal nucleus arrangement of spherical particles without gaps, and the tap density of the spherical particles is detected to be 2.35g/cm3。
Comparative example 1
The comparative example provides a preparation method of a large-particle nickel-cobalt-manganese ternary precursor material, which comprises the following steps:
s1, preparing soluble nickel sulfate, cobalt sulfate and manganese sulfate into a mixed solution according to a stoichiometric ratio, wherein the molar concentration of total metal ions in the mixed solution is 1.8 mol/L;
mixing sodium hydroxide solution with deionized water according to a certain metering ratio to prepare a precipitator solution with the concentration of 2.2 mol/L; preparing an ammonia water solution with the concentration of 5.4mol/L as a complexing agent solution;
s2, adding deionized water into a reaction kettle, controlling the stirring speed at 300r/min, starting to heat to 56 ℃, adding ammonia water to adjust the ammonia water concentration of the bottom liquid in the reaction kettle to be 5.4g/L, adding sodium hydroxide solution to adjust the pH value to 11.8, introducing nitrogen into the reaction kettle for 1h while adding reaction materials, wherein the nitrogen flow is controlled to be 1m3/h；
Adding the mixed solution, the precipitator solution and the complexing agent solution in the S1 into a reaction kettle containing a base solution in a continuous feeding mode by adopting a traditional feeding pipe, and discharging clear liquid in an overflowing mode for reaction to obtain a spherical nickel-cobalt-manganese ternary precursor;
wherein the coprecipitation reaction temperature is 56 ℃, the pH value of the coprecipitation reaction is 10.2-11.0, and the concentration of the complexing agent in the reaction kettle is 5.4 g/L;
s3, directly aging the spherical nickel-cobalt-manganese precursor obtained in the step S2 in a reaction kettle for 2 hours, pumping the spherical nickel-cobalt-manganese precursor into a centrifuge by a pump, centrifugally washing the spherical nickel-cobalt-manganese precursor with 1 wt% of sodium hydroxide solution at 60 ℃ until the pH value is 7.8, and drying the spherical nickel-cobalt-manganese precursor at 150 ℃ to obtain dry spherical nickel-cobalt-manganese precursor material particles.
In the preparation process of the comparative example, a scanning electron microscope is used for sampling to detect the primary particles, and the primary particles prepared by the preparation method of the comparative example are also spindle bodies, but have uneven particle size distribution, some primary particles have the length of about 1 μm, and some primary particles have the length of about 5 μm; the thickness of the primary particles is also not uniform.
Scanning electron microscope detection is carried out on the nickel-cobalt-manganese precursor material prepared by the preparation method of the comparative example, and the results show that although the nickel-cobalt-manganese precursor material also has a spherical structure, the particle size distribution is not uniform as that of example 1, and D50 of the comparative example 1 is 14.3 mu m, and the tap density is 2.14g/cm3This indicates that there are more voids in the nuclei of the spherical particles, resulting in the tap density of comparative example 1 being smaller than that of example 1.
Example 2
The embodiment provides a preparation method of a small-particle nickel-cobalt-manganese ternary precursor material, which comprises the following steps:
s1, preparing soluble nickel sulfate, cobalt sulfate and manganese sulfate into a mixed solution according to a stoichiometric ratio, wherein the molar concentration of total metal ions in the mixed solution is 1.2 mol/L;
mixing sodium hydroxide solution with deionized water according to a certain metering ratio to prepare a precipitator solution with the concentration of 2.6 mol/L; preparing an ammonia water solution with the concentration of 6mol/L as a complexing agent solution;
s2, adding deionized water into a reaction kettle, controlling the stirring speed at 400r/min, starting to heat to 60 ℃, adding ammonia water to adjust the ammonia water concentration of the bottom liquid in the reaction kettle to be 4.8g/L, adding sodium hydroxide solution to adjust the pH value to 11.8, introducing nitrogen into the reaction kettle for 1h while adding reaction materials, wherein the nitrogen flow is controlled to be 1m3/h；
Adding the mixed solution, the precipitator solution and the complexing agent solution in the S1 into a reaction kettle containing a base solution in a continuous feeding mode through a disc-type feeding pipe capable of refining and accelerating the feeding amount of the reaction materials, and discharging clear liquid in an overflowing mode for reaction to obtain a spherical nickel-cobalt-manganese ternary precursor;
wherein the coprecipitation reaction temperature is 60 ℃, the coprecipitation reaction pH is 11.2-11.8, and the concentration of the complexing agent in the reaction kettle is 6 g/L;
s3, directly aging the spherical nickel-cobalt-manganese precursor obtained in the step S2 in a reaction kettle for 8 hours, pumping the spherical nickel-cobalt-manganese precursor into a centrifuge by a pump, centrifugally washing the spherical nickel-cobalt-manganese precursor with 3 wt% of sodium hydroxide solution at 65 ℃ until the pH value is 8.5, and drying the spherical nickel-cobalt-manganese precursor at 150 ℃ to obtain dry spherical nickel-cobalt-manganese precursor material particles.
The disc-type feeding pipe in the present embodiment, as shown in fig. 1, includes a feeding pipe 1 and a discharging pipe 2 of a ring structure; the feeding pipe 1 is communicated with the discharging pipe 2; the inner side wall of the discharge pipe 2 is provided with 20 discharge ports 21, and the aperture of each discharge port 21 is 5 mm;
after reaction material flowed from discharge gate 21, reaction material assembles towards 2 middle parts of annular structure's discharging pipe, because reaction material's flow is unchangeable, so the velocity of flow of the reaction material who flows from discharge gate 21 increases, and increased the area of contact of the reaction material in reaction kettle from the reaction material that discharge gate 21 flowed, and the reaction material that just finally can make discharge gate 21 flow mixes more evenly with the reaction material in the reaction kettle in the short time.
In addition, opening discharge gate 21 at the inside wall of discharging pipe 2 can also avoid reaction mass deposit in discharging pipe 2, makes the material obtain a bigger degree of supersaturation, tends to the nucleation process.
In addition, in the present embodiment, the discharge port 21 is located between the baffle and the stirring paddle in the reaction kettle, and the vertical distance H between the discharge port 21 and the kettle bottom of the reaction kettle is 4/17H, where H is the depth of the reaction kettle; on one hand, the reaction materials flowing out of the discharge port 21 can be fully mixed with the reaction materials in the reaction kettle, so that the flowing reaction materials are stirred to the maximum extent; another utility model is to avoid the reaction material in the reation kettle to splash to reation kettle's inside wall on to cause reaction material's waste, and then influence the product, produce property ability even.
In the preparation process in this embodiment, a scanning electron microscope is used for sampling to detect the primary particles, and the primary particles prepared by the preparation method of this embodiment have uniform particle size distribution, are spindle-shaped, have a length of 0.8 μm, and have a thickness of 0.1 μm.
The system of the present embodimentThe small-particle nickel-cobalt-manganese precursor material prepared by the preparation method is detected to have a chemical molecular formula of Ni0.6Co0.1Mn0.3(OH)2Scanning electron microscope detection is carried out on the small-particle nickel-cobalt-manganese precursor material, and the result shows that the nickel-cobalt-manganese precursor material is of a spherical structure and is uniform in particle size distribution; as can be seen from the particle size distribution detection, D50 of the Ni-Co-Mn precursor material of the embodiment is 3.5 μm, which indicates that the Ni-Co-Mn precursor material prepared in the embodiment is a small-particle Ni-Co-Mn ternary precursor material, the crystal nuclei of the spherical particles are densely arranged and have no gaps, and the tap density of the Ni-Co-Mn ternary precursor material is 1.87g/cm3。
Comparative example 2
The comparative example provides a preparation method of a small-particle nickel-cobalt-manganese ternary precursor material, which comprises the following steps:
s1, preparing soluble nickel sulfate, cobalt sulfate and manganese sulfate into a mixed solution according to a stoichiometric ratio, wherein the molar concentration of total metal ions in the mixed solution is 1.2 mol/L;
mixing sodium hydroxide solution with deionized water according to a certain metering ratio to prepare a precipitator solution with the concentration of 2.6 mol/L; preparing an ammonia water solution with the concentration of 6mol/L as a complexing agent solution;
s2, adding deionized water into a reaction kettle, controlling the stirring speed at 400r/min, starting to heat to 60 ℃, adding ammonia water to adjust the ammonia water concentration of the bottom liquid in the reaction kettle to be 4.8g/L, adding sodium hydroxide solution to adjust the pH value to 11.8, introducing nitrogen into the reaction kettle for 1h while adding reaction materials, wherein the nitrogen flow is controlled to be 1m3/h；
Adding the mixed solution, the precipitator solution and the complexing agent solution in the S1 into a reaction kettle containing a base solution in a continuous feeding mode by adopting a traditional feeding pipe, and discharging clear liquid in an overflowing mode for reaction to obtain a spherical nickel-cobalt-manganese ternary precursor;
wherein the coprecipitation reaction temperature is 60 ℃, the pH value of the coprecipitation reaction is 11.2-12.0, and the concentration of the complexing agent in the reaction kettle is 6 g/L;
s3, directly aging the spherical nickel-cobalt-manganese precursor obtained in the step S2 in a reaction kettle for 8 hours, pumping the spherical nickel-cobalt-manganese precursor into a centrifuge by a pump, centrifugally washing the spherical nickel-cobalt-manganese precursor with 3 wt% of sodium hydroxide solution at 65 ℃ until the pH value is 8.5, and drying the spherical nickel-cobalt-manganese precursor at 150 ℃ to obtain dry spherical nickel-cobalt-manganese precursor material particles.
In the preparation process of the comparative example, a scanning electron microscope is used for sampling to detect the primary particles, and the primary particles prepared by the preparation method of the comparative example 2 are also spindle bodies, but have uneven particle size distribution, some primary particles have the length less than 1 μm, and some primary particles have the length as long as about 3 μm; the thickness of the primary particles is also not uniform.
Scanning electron microscope detection is carried out on the small-particle nickel-cobalt-manganese precursor material prepared by the preparation method of the comparative example 2, and the result shows that although the nickel-cobalt-manganese precursor material also has a spherical structure, the particle size distribution is not uniform than that of the example 2, and the D50 of the comparative example 2 is 3.7 mu m, and the tap density is 1.64g/cm3This indicates that there are more voids in the nuclei of the spherical particles, resulting in the tap density of comparative example 2 being smaller than that of example 2.
Example 3
The embodiment provides a preparation method of a small-particle nickel-cobalt-manganese ternary precursor material, which comprises the following steps:
s1, preparing soluble nickel sulfate, cobalt sulfate and manganese sulfate into a mixed solution according to a stoichiometric ratio, wherein the molar concentration of total metal ions in the mixed solution is 2.4 mol/L;
mixing a sodium hydroxide solution with deionized water according to a certain metering ratio to prepare a precipitator solution with the concentration of 2 mol/L; preparing ammonia water solution with the concentration of 3mol/L as complexing agent solution;
s2, adding deionized water into a reaction kettle, controlling the stirring speed at 400r/min, starting to heat to 55 ℃, adding ammonia water to adjust the ammonia water concentration of the bottom liquid in the reaction kettle to 8g/L, adding sodium hydroxide solution to adjust the pH value to 11.6, introducing nitrogen into the reaction kettle for 1h while adding reaction materials, and controlling the nitrogen flow to be 2m3/h；
Adding the mixed solution, the precipitator solution and the complexing agent solution in the S1 into a reaction kettle containing a base solution in a continuous feeding mode through a disc-type feeding pipe capable of refining and accelerating the feeding amount of the reaction materials, and discharging clear liquid in an overflowing mode for reaction to obtain a spherical nickel-cobalt-manganese ternary precursor;
wherein the coprecipitation reaction temperature is 50 ℃, the coprecipitation reaction pH is 10.8-11.6, and the concentration of the complexing agent in the reaction kettle is 5 g/L;
s3, directly aging the spherical nickel-cobalt-manganese precursor obtained in the step S2 in a reaction kettle for 10 hours, pumping the spherical nickel-cobalt-manganese precursor into a centrifuge by a pump, centrifugally washing the spherical nickel-cobalt-manganese precursor with 5 wt% of sodium hydroxide solution at 55 ℃ until the pH value is 8, and drying the spherical nickel-cobalt-manganese precursor at 100 ℃ to obtain dry spherical nickel-cobalt-manganese precursor material particles.
The disc type feeding pipe in the embodiment comprises a feeding pipe 1 and a discharging pipe 2 with an annular structure; the feeding pipe 1 is communicated with the discharging pipe 2; the inner side wall of the discharge pipe 2 is provided with 15 discharge ports 21, and the aperture of each discharge port 21 is 8 mm;
in the present embodiment, the discharge port 21 is located between the baffle and the stirring paddle in the reaction kettle, and the vertical distance H between the discharge port 21 and the kettle bottom of the reaction kettle is 3/17H, where H is the depth of the reaction kettle; on one hand, the reaction materials flowing out of the discharge port 21 can be fully mixed with the reaction materials in the reaction kettle, so that the flowing reaction materials are stirred to the maximum extent; another utility model is to avoid the reaction material in the reation kettle to splash to reation kettle's inside wall on to cause reaction material's waste, and then influence the product, produce property ability even.
Through detection, the nickel-cobalt-manganese precursor material prepared by the preparation method of the embodiment has a chemical molecular formula of Ni0.65Co0.05Mn0.3(OH)2Scanning electron microscope detection is carried out on the nickel-cobalt-manganese precursor material, and the result shows that the nickel-cobalt-manganese precursor material is of a spherical structure and has uniform particle size distribution; as can be seen from the particle size distribution detection, D50 of the nickel-cobalt-manganese precursor material of this embodiment is 3.8 μm, which indicates that the nickel-cobalt-manganese precursor material prepared in this embodiment is a small-particle nickel-cobalt-manganese ternary precursor material, and the crystal nuclei of the spherical particles are densely arranged without any gap, and the tap density of the nickel-cobalt-manganese ternary precursor material is 1.93g/cm3。
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention should be covered by the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (4)
1. A disc-type feeding pipe is used for conveying a reaction material of a ternary precursor into a reaction kettle and is characterized by comprising a feeding pipe (1) and a discharging pipe (2) with an annular structure; the feeding pipe (1) is communicated with the discharging pipe (2); a plurality of discharge ports (21) are formed in the inner side wall of the discharge pipe (2).
2. The disk feed pipe according to claim 1, characterized in that the number of discharge openings (21) is at least two.
3. The disc-type feeding pipe according to claim 2, characterized in that the aperture of the discharge port (21) is 2-10 mm.
4. The tray feed pipe according to claim 1, characterized in that the discharge port (21) is located above the reaction mass in the reaction vessel, and the vertical distance h between the discharge port (21) and the bottom of the reaction vessel is such that: 2/17H < H <4/17H, where H is the depth of the reaction vessel.
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