Particle screening device and system in powder material pulping process

Abstract

The utility model relates to the technical field of powder beating and screening equipment, in particular to a particle screening device and system in the powder material beating process, the device comprises a screening barrel, a stirring paddle and a collecting barrel, the screening barrel is located in the collecting barrel, the stirring paddle is located in the screening barrel, and the stirring paddle is located in the collecting barrel. A plurality of screening holes are formed in the side wall of the screening barrel; powder slurry enters the screening barrel from the feeding port, powder materials in the powder slurry are synchronously crushed and screened under the stirring acting force of the stirring paddle, and the problems that in the prior art, due to uneven particles, agglomeration is caused, the application performance of the powder materials is affected, agglomerated large particles cannot be depolymerized in the pulping process, and the pulping efficiency is poor are solved. And finally, residues in the slurry affect subsequent processes and products.

Description

Technical Field

[0001] The utility model relates to the technical field of powder pulping and screening equipment, in particular to a particle screening device and system during the pulping process of powder materials. Background Technique

[0002] Titanium dioxide (TiO2) is a white inorganic pigment with the characteristics of non-toxicity, good transparency, high whiteness and brightness. It is considered to be the best white pigment in the world at present and is widely used in industrial fields such as coatings, plastics, rubbers, papermaking, chemical fiber inks, and cosmetics. Most powder slurries have requirements for the fineness of the material itself, requiring the powder particles to be uniform and without large particles, otherwise it will affect the application performance of the powder.

[0003] CN116515322A discloses a rutile titanium dioxide for a new type of environmentally friendly green coating and its production method, including the following steps: (1) grinding the rutile titanium dioxide intermediate product; (2) dilution and pulping: the titanium dioxide qualified after grinding in step (1) is diluted and pulped with demineralized water; (3) coating with sodium silicate: adding Na2SiO3 to the titanium dioxide slurry obtained in step (2); (4) first adjusting the system pH: adding dilute sulfuric acid to the slurry obtained in step (3) until the system pH value is 9 - 10; (5) second adjusting the system pH: adding dilute sulfuric acid to the slurry obtained in step (4) until the system pH value is 7 - 8; (6) third adjusting the system pH: adding dilute sulfuric acid to the slurry obtained in step (5) until the system pH value is 5 - 6; (7) fourth adjusting the system pH: adding dilute sulfuric acid to the slurry obtained in step (6) until the system pH value is 3 - 4; (8) coating with aluminum oxide: the slurry obtained in step (7) is aged and then cooled to 50°C - 70°C, slowly adding NaAlO2 to adjust the system pH value to 7.5 - 8.5, and then adding NaAlO2 and Al2(SO4)3 to maintain the system pH value at 7.5 - 8.5; (9) drying and pulverizing: the above materials are dried and pulverized by steam powder to obtain the finished product. Among them, the grinding in step (1) described in the above solution includes: after the rutile titanium dioxide intermediate product is crushed by a roller press and mill, adding demineralized water and a dispersant to pulp to a TiO2 concentration of 500g / L - 800g / L, and then crushing to a particle size of 0.2μm - 0.5μm through a ball mill and a sand mill. The dilution and pulping in step (2) is to a TiO2 concentration of 300g / L - 350g / L.

[0004] CN115449236B discloses a preparation method of coated titanium dioxide. The preparation method of coated titanium dioxide is based on a processing device. The specific steps of the preparation method of coated titanium dioxide include: Step 1: Pulverize the initial product of coated titanium dioxide with water, then add the prepared dispersant, stir while adding, and monitor the pH value of the slurry at any time, finally keeping the pH value of the slurry at 9-11. Step 2: Grind the slurry after pulping and dispersing, then screen it, and finally remove the particles above 45μm in the slurry.

[0005] It can be seen that in the treatment process of rutile titanium dioxide, the existing technologies are all divided into "two steps". Either grind first, then add a dispersant and pulp, or pulp first, then add a dispersant and grind and filter to obtain the titanium dioxide required for the corresponding process. The process steps are complex and multiple devices or various dispersants need to be coordinated to achieve the final effect. And most processes are during filtration.

[0006] Based on the above situation of the existing technology, there are still technical problems to be solved urgently in the existing technology, such as the uneven particles of rutile titanium dioxide leading to agglomeration and affecting the application performance of the powder, and the large agglomerated particles cannot be depolymerized during the pulping process and finally remain in the slurry, affecting the subsequent process and products. Utility Model Content

[0007] To solve the above technical problems, the present utility model provides a particle screening device during the pulping process of powder materials. The device includes a screening barrel, a stirring paddle, and a collection barrel. The screening barrel is located inside the collection barrel, the stirring paddle is located inside the screening barrel, and several screening holes are provided on the side wall of the screening barrel;

[0008] Wherein the central axis of the screening barrel coincides with the central axis of the collection barrel.

[0009] Further, the screening barrel is detachably arranged inside the collection barrel.

[0010] Further, the screening barrel and the collection barrel are of a cylindrical barrel structure.

[0011] Further, several groups of paddle blade groups are provided on the stirring paddle, and each group of paddle blade groups includes two or more paddle blades symmetrically arranged.

[0012] Further, several round holes are provided on each paddle blade.

[0013] Further, the stirring paddle is connected to a stirring motor.

[0014] Further, the paddle blade is a square paddle blade or a rhombus paddle blade.

[0015] Further, the included angle β between the diamond-shaped blade and the stirring shaft is 30-95°.

[0016] Further, the device is provided with a feed inlet, and the feed inlet is located above the screening barrel.

[0017] Further, the device is provided with a discharge outlet, and the discharge outlet is located below the side wall of the collection barrel or below the collection barrel.

[0018] Further, a discharge valve is provided on the discharge outlet.

[0019] Further, several layers of collection plate groups are provided on the side wall of the collection barrel, and each layer of the collection plate group is provided with 4 or more collection plates.

[0020] Further, the included angle α between each collection plate and the side wall of the collection barrel is 20-80°, and the included angles between each collection plate and the side wall of the collection barrel can be the same or different.

[0021] Further, holes are formed in the collection plate.

[0022] Further, the holes are of square structure.

[0023] Further, a clamping groove is provided on the side wall of the collection barrel, and a clamping buckle is provided on the collection plate to realize the movable clamping connection between the collection plate and the collection barrel.

[0024] Further, fins inclined downward are further provided on the upper side of the open end of the screening hole and facing the direction of the collection barrel.

[0025] The present utility model provides a powder material particle screening system, and the system sequentially includes a powder slurry mixer, the above-mentioned particle screening device during the pulping process of the powder material, and a filtering and collecting device according to the material flow direction.

[0026] Further, the powder slurry mixer is used to mix the powder material and the liquid, and enters the device through the feed inlet on the device.

[0027] Further, the filtering and collecting device includes a filter screen, and the powder slurry sent out from the discharge outlet in the device is filtered through the filter screen to perform solid-liquid separation of the powder slurry, and the powder material after crushing and screening is obtained.

[0028] Further, the system further includes a liquid circulation device, and the liquid circulation device is connected to the filtering and collecting device and the powder slurry mixer to recycle the liquid filtered out in the filtering and collecting device back to the powder slurry mixer to be mixed with the newly added powder material.

[0029] Furthermore, the powder slurry includes powder materials and a liquid.

[0030] Furthermore, the powder materials are titanium dioxide and the liquid is water.

[0031] The beneficial effects of the present utility model are as follows:

[0032] 1. The present utility model provides a particle screening device during the pulping process of powder materials. The device includes a screening barrel, a stirring paddle, and a collection barrel. The screening barrel is located inside the collection barrel, and the stirring paddle is located inside the screening barrel. A number of screening holes are provided on the side wall of the screening barrel; wherein the central axis of the screening barrel coincides with the central axis of the collection barrel;

[0033] The powder slurry enters the screening barrel from the feed port. Under the stirring action of the stirring paddle, the powder materials in the powder slurry are synchronously broken and screened. The powder materials smaller than the aperture of the screening holes enter the collection barrel by means of the impact force of the powder slurry. The powder materials that cannot pass through the screening holes in the screening barrel will continue to be synchronously broken and screened in the screening barrel; it solves the technical problems in the prior art that due to uneven particles, agglomeration affects the application performance of the powder materials, and the large agglomerated particles cannot be depolymerized during the pulping process and finally remain in the slurry, affecting the subsequent processes and products.

[0034] 2. In the present utility model, a number of round holes are provided on each blade to increase the turbulence degree of the powder slurry during the stirring process;

[0035] 3. In the present utility model, the blades are square blades or diamond-shaped blades; the square blades can generate strong shear force and impact force during the stirring process, which is helpful for the breaking of the powder slurry. At the same time, the square blades have high structural strength and can withstand large mechanical loads; the diamond-shaped blades are used to reduce the force acting on the blades during stirring, while increasing the strength of the blades themselves, extending the service life of the blades, and reducing damage caused by excessive force. At the same time, the shape of the diamond-shaped blades helps to avoid dead corners during the stirring process, ensuring that the powder slurry is more comprehensively stirred and broken;

[0036] 4. In the present utility model, several layers of collecting plate groups are provided on the side wall of the collecting bucket. Each layer of the collecting plate group is provided with 4 or more collecting plates to achieve the uniform flow of the powder slurry. By blocking and changing the flow path of the powder slurry, the phenomenon of uneven flow caused by the differences in temperature and density of the powder slurry is reduced, so as to ensure the uniform distribution of the powder slurry in the collecting bucket. The collecting plate group guides the powder slurry to flow towards the discharge port. During the stirring process, the powder slurry gradually approaches the discharge port layer by layer, reducing the residence time of the powder slurry in the collecting bucket, improving the efficiency of powder slurry treatment, and timely flowing the powder slurry out of the device through the way of layer-by-layer swirling;

[0037] 5. In the present utility model, the included angle α between each collecting plate and the side wall of the collecting bucket is 20 - 80°. The included angles between each collecting plate and the side wall of the collecting bucket can be the same or different. The setting of the included angle is used to prevent the powder slurry in the collecting bucket from being folded back into the screening bucket under the stirring action of the stirring paddle, reducing the screening efficiency;

[0038] 6. In the present utility model, holes are provided on the collecting plate. The holes serve as channels for the powder slurry to flow through, further promoting the uniform distribution and mixing of the powder slurry in the collecting bucket and ensuring the uniform dispersion of the powder slurry. The holes are of a square structure to control the flow rate and pressure of the powder slurry, playing a role in pressure balance, avoiding the deformation or rupture of the device due to excessive pressure difference, and prolonging the service life of the device;

[0039] 7. In the present utility model, on the upper side of the open end of the screening hole, in the direction towards the collecting bucket, there are also inclined downward fins. The fins can utilize their inclined angles to make the powder slurry move downward along the inclined trajectory of the fins, preventing the powder slurry from blocking the screening hole, helping the powder slurry to pass through the screening hole, and at the same time preventing the powder slurry in the collecting bucket from being folded back into the screening bucket to reduce the screening efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 It is a schematic vertical sectional structure diagram of the particle screening device for the powder slurry beating process of the present utility model;

[0041] Figure 2 It is a schematic vertical sectional structure diagram of the device when the paddle is a diamond-shaped paddle of the present utility model;

[0042] Figure 3 It is a schematic top view structure diagram of the collecting plate in the collecting bucket of the present utility model;

[0043] Figure 4 It is a schematic structure diagram of the screening hole with fins of the present utility model;

[0044] The names of the reference numerals in the figures are:

[0045] 1. Screening barrel; 101. Screening holes; 102. Fins; 2. Stirring paddle; 201. Blades; 202. Round holes; 3. Collection barrel; 301. Collection plate; 302. Holes; 4. Feed inlet; 5. Discharge outlet. Detailed implementation manners

[0046] Example 1

[0047] As Figure 1 shown, this example provides a particle screening device during the pulping process of powder slurry. The device includes a screening barrel 1, a stirring paddle 2, and a collection barrel 3. The screening barrel 1 is located inside the collection barrel 3, and the stirring paddle 2 is located inside the screening barrel 1. A number of screening holes 101 are provided on the side wall of the screening barrel 1;

[0048] Wherein the central axis of the screening barrel 1 coincides with the central axis of the collection barrel 3.

[0049] The screening barrel 1 is detachably arranged inside the collection barrel 3, and the aperture of the screening holes 101 can be selected according to the particle size of the required powder slurry.

[0050] The screening barrel 1 and the collection barrel 3 are of a cylindrical barrel structure.

[0051] In this example, there are 2 groups of blade groups on the stirring paddle 2, and each group of blade groups includes two symmetrically arranged blades 201. In some examples, the number of groups of the blade groups is not limited to 2 groups.

[0052] A number of round holes 202 are provided on each blade 201 to increase the turbulence degree of the powder slurry during the stirring process.

[0053] The stirring paddle 2 is connected to a stirring motor, and the stirring motor is used to control the stirring rate of the stirring paddle 2.

[0054] In this example, the blade 201 is a square blade; the square blade can generate strong shear force and impact force during the stirring process, which helps to break the powder slurry. At the same time, the square blade has high structural strength and can withstand large mechanical loads.

[0055] In some examples, as Figure 2 shown, the blade 201 is a rhombic blade; the rhombic blade is used to reduce the force acting on the blade 201 during stirring, while increasing the strength of the blade 201 itself, extending the service life of the blade 201, and reducing damage caused by excessive force. At the same time, the shape of the rhombic blade helps to avoid dead corners during the stirring process, ensuring more comprehensive stirring and breaking of the powder slurry. The included angle β between the rhombic blade and the stirring shaft is 50°.

[0056] The device is provided with a feed inlet 4 which is located above the screening barrel 1.

[0057] The device is provided with a discharge outlet 5 which is located below the side wall of the collection barrel 3. In some embodiments, the discharge outlet 5 is located below the collection barrel 3.

[0058] A discharge valve is provided on the discharge outlet 5.

[0059] In this embodiment, one layer of collection plate groups is provided on the side wall of the collection barrel 3. Each layer of the collection plate groups is provided with 4 or more collection plates 301 to achieve uniform flow of the powder slurry. By blocking and changing the flow path of the powder slurry, the phenomenon of uneven flow caused by differences in temperature and density of the powder slurry is reduced, so as to ensure uniform distribution of the powder slurry in the collection barrel 3. The collection plate groups guide the powder slurry to flow towards the discharge outlet 5. During the stirring process, the powder slurry gradually approaches the discharge outlet 5 layer by layer, reducing the residence time of the powder slurry in the collection barrel 3, improving the efficiency of powder slurry treatment, and timely flowing the powder slurry out of the device in a way of layer-by-layer swirling flow. In some embodiments, the number of groups of the collection plate groups can be adjusted according to the actual particle size of the powder material, such as 2 groups or more of the collection plate groups.

[0060] In this embodiment, the included angle α between each collection plate 301 and the side wall of the collection barrel 3 is 60°. The included angle between each collection plate 301 and the side wall of the collection barrel is the same. In some embodiments, the included angle between each collection plate 301 and the side wall of the collection barrel can be different. The setting of the included angle is used to prevent the powder slurry in the collection barrel 3 from being folded back into the screening barrel 1 under the stirring action of the stirring paddle, reducing the screening efficiency.

[0061] As Figure 3 shown, in this embodiment, holes 302 are formed in the collection plate 301. The holes 302 serve as channels for the powder slurry to flow through, further promoting the uniform distribution and mixing of the powder slurry in the collection barrel 3 and ensuring the uniform dispersion of the powder slurry.

[0062] In this embodiment, the holes 301 are of square structure to control the flow rate and pressure of the powder slurry, playing a role in pressure balance, avoiding deformation or rupture of the device due to excessive pressure difference, and prolonging the service life of the device.

[0063] In some embodiments, a clamping groove is provided on the side wall of the collection barrel 3, and a clamping buckle is provided on the collection plate 301 to realize the movable clamping connection between the collection plate 301 and the collection barrel 3, which is convenient for disassembly and replacement.

[0064] In some embodiments, such asFigure 4 As shown, on the upper side of the open end of the screening hole 101, in the direction towards the collection bucket, there is also an inclined downward fin 102. The fin 102 can utilize its inclined angle to make the powder slurry move downward along the inclined track of the fin 102, so as to prevent the powder slurry from blocking the screening hole 101, which helps the powder slurry to pass through the screening hole 101. At the same time, it prevents the powder slurry in the collection bucket from returning to the screening bucket 1 and reducing the screening efficiency.

[0065] In this embodiment, the powder slurry is a mixture of powder materials and liquid, such as a mixture of titanium dioxide and water. The powder slurry enters the screening bucket 1 from the feed port 4. Under the stirring action of the stirring paddle 2, the powder materials in the powder slurry are synchronously crushed and screened. The powder materials smaller than the aperture of the screening hole 101 enter the collection bucket 3 by means of the impact force of the powder slurry. The powder materials in the screening bucket 1 that cannot pass through the screening hole 101 will continue to be synchronously crushed and screened in the screening bucket 1;

[0066] For the powder slurry that enters the collection bucket 3, since there is a specific collection plate group in the collection bucket 3, the residence time of the powder slurry in the collection bucket 3 is reduced, the processing efficiency of the powder slurry is improved, and the powder slurry is timely discharged from the device by means of layer-by-layer swirling and quickly enters the discharge port 5 for discharging. This solves the technical problem in the prior art that due to uneven particles, agglomeration affects the application performance of the powder materials, and the large agglomerated particles cannot be depolymerized during the pulping process and finally remain in the slurry, affecting the subsequent processes and products.

[0067] Embodiment 2

[0068] This embodiment provides a powder material particle screening system. The system sequentially includes a powder slurry mixer, the particle screening device in the powder material pulping process in Embodiment 1, and a filtering and collecting device according to the material flow direction.

[0069] The powder slurry mixer is used to mix powder materials and liquid, and enters the device through the feed port 4 on the device.

[0070] The filtering and collecting device includes a filter screen. The powder slurry sent out from the discharge port 5 in the device is filtered by the filter screen for solid-liquid separation of the powder slurry, and the crushed and screened powder materials are obtained.

[0071] In this embodiment, the system further includes a liquid circulation device. The liquid circulation device is connected to the filtering and collecting device and the powder slurry mixer to recycle the liquid filtered out in the filtering and collecting device back to the powder slurry mixer to be mixed with the newly added powder materials.

[0072] It should be understood that the present utility model is not limited to the content and structure described above and shown in the drawings, and various modifications and changes can be made without departing from its scope. The scope of the present utility model is only limited by the appended claims.

Claims

1. A particle screening device during the pulping process of powder materials, characterized in that, The device includes a screening barrel (1), a stirring paddle (2), and a collection barrel (3). The screening barrel (1) is located inside the collection barrel (3), and the stirring paddle (2) is located inside the screening barrel (1). A plurality of screening holes (101) are provided on the side wall of the screening barrel; Among them, the central axes of the screening barrel (1) and the collection barrel (3) coincide.

2. The particle screening device during the pulping process of the powder material according to claim 1, characterized in that, The screening barrel (1) is detachably arranged inside the collection barrel (3).

3. The particle screening device during the pulping process of powder materials according to claim 1, wherein, A plurality of groups of paddle blades (201) are provided on the stirring paddle (2). Each group of paddle blades (201) includes two or more paddle blades (201) symmetrically arranged.

4. The particle screening device during the pulping process of powder materials according to claim 3, characterized in that, A plurality of round holes (202) are provided on each paddle blade (201).

5. The particle screening device during the pulping process of powdery materials according to claim 1, wherein, The device is provided with a feed inlet (4), and the feed inlet (4) is located above the screening barrel (1); The device is provided with a discharge outlet (5), and the discharge outlet (5) is located below the side wall of the collection barrel (3) or below the collection barrel (3).

6. The particle screening device during the pulping process of powdery materials according to claim 1, characterized in that, A plurality of groups of collection plates (301) are provided on the side wall of the collection barrel (3). Each group of collection plates (301) has 4 or more collection plates (301); The included angle α between each collection plate (301) and the side wall of the collection barrel (3) is 20 - 80°. The included angles between each collection plate (301) and the side wall of the collection barrel (3) can be the same or different.

7. The particle screening device during the slurrying process of powdery materials according to claim 1, wherein On the upper side of the open end of the screening hole (101), and in the direction towards the collection barrel, there is also an inclined downward fin (102) provided.

8. A powder material particle screening system, characterized in that The system sequentially includes a powder slurry mixer, a particle screening device during the pulping process of the powder material in claims 1 - 7, and a filtration and collection device according to the material flow direction.

9. The particle screening device during the pulping process of powder materials according to claim 8, characterized in that The filtration and collection device includes a filter screen.

10. The particle screening device during the pulping process of the powder material according to claim 8, wherein, The system further includes a liquid circulation device, and the liquid circulation device is connected to the filtration and collection device and the powder slurry mixer.

Images