Grading process and equipment for wax micro-powder particles
By floating the wax powder particles in the vertical liquid and grading with the layering effect of the transverse liquid, the problem of difficult separation of larger or smaller particle size particles in the wax powder particles in the prior art is solved, and efficient particle size grading and separation effects are achieved.
Patent Information
- Application Number
- CN202510550810.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-29
- Publication Date
- 2025-06-27
AI Technical Summary
The prior art is difficult to effectively separate larger or smaller particle size particles in wax powder particles, and cannot meet the specific requirements for particle size in different application fields.
By placing the wax powder particles in a vertical liquid, they float up under the action of buoyancy, and using the layering effect of the transverse liquid, particles with larger particle sizes are separated into the upper liquid, and particles with smaller particle sizes are separated into the lower liquid, and then dehydrated and dried to complete the grading.
Effective grading of wax powder particles is achieved, the separation effect of particle size distribution is improved, the specific requirements for particle size in different application fields is met, and the density difference changes caused by particle dissolution is avoided.
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Abstract
Description
Technical Field
[0001] The present invention relates to the technical field of particle classification, and particularly relates to a classification process and equipment for wax micro-powder particles. Background Art
[0002] Wax micro-powder particles have a wide range of applications, especially in coatings, inks, daily chemicals, energy, and 3D printing. However, different fields have different requirements, especially in terms of particle size. To meet the particle size requirements of different fields, the produced wax micro-powder particles are usually classified, and the classification method can be screening or air classification.
[0003] In related technologies, a kind of wax micro-powder particles is prepared according to the following steps: a wax melt and hot water are blended and sprayed out at a flow rate ratio of 1:(10 - 20) to form a spray. The spray enters a spray pond water whose temperature is 1 - 5 °C lower than the melting point of the wax. The wax droplets in the spray condense into spherical wax melts in the spray pond water, and the spherical wax melts cool down in the spray pond water to form wax micro-powder particles.
[0004] The size of the wax micro-powder particles prepared by the above steps is within a size range with a normal distribution, and the larger or smaller particles may not meet the usage requirements of some application scenarios. How to separate these larger or smaller wax micro-powder particles during the production process is a problem that needs to be solved currently. Summary of the Invention
[0005] In order to classify wax micro-powder particles during the production process, the present application provides a classification process and equipment for wax micro-powder particles.
[0006] In the first aspect, a classification process for wax micro-powder particles provided by the present application adopts the following technical scheme:
[0007] A classification process for wax micro-powder particles includes the following steps:
[0008] Place the wax micro-powder particles in a vertical liquid. The wax micro-powder particles float upward in the vertical direction under the action of buoyancy. The top of the vertical liquid is connected to a horizontal liquid, and the wax micro-powder particles move into the horizontal liquid;
[0009] The wax micro-powder particles move horizontally in the horizontal liquid. The end of the horizontal liquid is divided into an upper liquid and a lower liquid. The wax micro-powder particles floating on the upper layer of the horizontal liquid flow with the upper liquid, and the wax micro-powder particles floating on the lower layer of the horizontal liquid flow with the lower liquid;
[0010] Dehydrate and dry the upper liquid and the lower liquid containing the wax micro-powder particles respectively, and thus complete the classification of the wax micro-powder particles.
[0011] By adopting the above technical solution, according to Stokes' law, the sedimentation velocity of spherical solid particles in a fluid is as follows: In this application: ρ p is the density of the particles, ρ f is the density of water, ρ p -ρ f is negative, and the other terms are fixed values and can be a constant. Therefore, the wax micro powder particles float in water, and their floating velocity is proportional to d 2 That is, the floating velocity of wax micro powder particles with larger particle sizes is faster than that of wax micro powder particles with smaller particle sizes. When the wax micro powder particles float into the horizontal liquid under the action of buoyancy, the wax micro powder particles with larger particle sizes are located in the upper layer of the horizontal liquid, and the wax micro powder particles with smaller particle sizes are located in the lower layer of the horizontal liquid. Therefore, the wax micro powder particles with smaller particle sizes follow the flow of the lower liquid, and the wax micro powder particles with larger particle sizes follow the flow of the upper liquid. By separately performing solid-liquid separation on the upper liquid and the lower liquid, the classification of the wax micro powder particles can be completed.
[0012] In a specific feasible embodiment, the wax micro powder particles are insoluble in the vertical liquid and the horizontal liquid.
[0013] By adopting the above technical solution, it is possible to avoid changes in the density difference caused by the dissolution of the wax micro powder particles, thereby ensuring a strict positive correlation between the floating velocity and the particle size and maintaining the distribution state of large particles in the upper layer and small particles in the lower layer in the horizontal liquid. The insoluble particles can be directly recovered after dehydration and drying without additional treatment of the dissolved substances. Moreover, the dissolved substances may recrystallize in the pipeline or separation equipment, resulting in scaling or blockage. The insoluble particles can prevent equipment blockage. If the vertical liquid and the horizontal liquid are water, the wax micro powder particles can be particles of any one of polyethylene wax, polypropylene wax, amide wax, paraffin wax, Fischer-Tropsch wax, rice bran wax, microcrystalline wax, palm wax, montan wax, fatty acids and their derivatives, and petroleum resin.
[0014] In a specific feasible embodiment, after the wax micro powder particles enter the vertical liquid, the velocity of the wax micro powder particles in the vertical direction tends to be stable.
[0015] By adopting the above technical solution, after the velocity of the wax micro powder particles in the vertical direction tends to be stable, their floating motion is completely dominated by buoyancy and fluid resistance, which can eliminate the interference of the initial kinetic energy and reduce the deviation of the trajectory of the wax micro powder particles after entering the horizontal liquid, further improving the classification effect.
[0016] An apparatus for a classification process applied to wax micro powder particles provided by this application adopts the following technical solution:
[0017] An apparatus for a classification process of wax micro - powder particles, comprising a vertical channel and a horizontal channel. The vertical channel is arranged in the vertical direction. One end of the horizontal channel is fixedly connected to the top of the vertical channel. The horizontal channel is in communication with the vertical channel and is arranged in the horizontal direction. A partition plate is provided in the horizontal channel. The space above the partition plate inside the horizontal channel forms an upper channel, and the space below the partition plate inside the horizontal channel forms a lower channel. The partition plate is located at the end of the horizontal channel far from the vertical channel.
[0018] By adopting the above - mentioned technical solution, after filling the vertical channel and the horizontal channel with liquid, the liquid in the vertical channel forms vertical liquid, and the liquid in the horizontal channel forms horizontal liquid. The partition plate divides the horizontal liquid into upper - layer liquid and lower - layer liquid. Larger - sized wax micro - powder particles are located in the upper layer of the horizontal liquid, medium - sized wax micro - powder particles are located in the middle layer of the horizontal liquid, and smaller - sized wax micro - powder particles are located in the lower layer of the horizontal liquid. Therefore, according to needs, by adjusting the position of the partition plate, the thickness of the upper - layer liquid and the lower - layer liquid can be adjusted, thereby screening out wax micro - powder particles of different particle sizes.
[0019] In summary, the present application has the following beneficial effects:
[0020] In the process of the present application, smaller - sized wax micro - powder particles flow with the lower - layer liquid, and larger - sized wax micro - powder particles flow with the upper - layer liquid. By separately performing solid - liquid separation on the upper - layer liquid and the lower - layer liquid, the classification of wax micro - powder particles can be completed, achieving the purpose of classifying wax micro - powder particles during the production process and helping to improve the classification effect. BRIEF DESCRIPTION OF THE DRAWINGS
[0021] Figure 1 It is a schematic structural diagram of the classification device for wax micro - powder particles in Embodiment 1 of the present application;
[0022] Figure 2 It is a schematic structural diagram of the classification device for wax micro - powder particles in Comparative Example 2 of the present application;
[0023] Figure 3 It is a schematic structural diagram of the classification device for wax micro - powder particles in Comparative Example 3 of the present application;
[0024] Reference numerals: 1, vertical channel; 11, left - hand channel; 12, right - hand channel; 2, horizontal channel; 21, upper channel; 22, lower channel; 3, partition plate. DETAILED DESCRIPTION OF THE EMBODIMENTS
[0025] The present application will be further described in detail below with reference to embodiments and comparative examples.
[0026] Embodiment
[0027] Example 1
[0028] This embodiment provides a grading device for wax micro-powder particles, including a vertical channel 1 arranged in the vertical direction and a horizontal channel 2 arranged in the horizontal direction. The left end of the horizontal channel 2 is welded to the top of the vertical channel 1, and the horizontal channel 2 is communicated with the vertical channel 1. A partition plate 3 is welded on the inner wall of the horizontal channel 2. The partition plate 3 is horizontally arranged. The space above the partition plate 3 inside the horizontal channel 2 forms an upper channel 21, and the space below the partition plate 3 inside the horizontal channel 2 forms a lower channel 22. The partition plate 3 is located at the right end of the horizontal channel 2.
[0029] The working principle of the grading device for wax micro-powder particles in this embodiment is as follows: Fill the vertical channel 1 and the horizontal channel 2 with water. The water in the vertical channel 1 forms a vertical liquid, and the water in the horizontal channel 2 forms a horizontal liquid. Continuously inject water into the horizontal channel 2 so that the horizontal liquid continuously flows out from the right end of the horizontal channel 2. The liquid in the upper channel 21 forms an upper liquid, and the liquid in the lower channel 22 forms a lower liquid.
[0030] Spray the wax micro-powder particles into the vertical liquid from the bottom of the vertical channel 1 in the vertically upward direction. After that, the velocity of the wax micro-powder particles in the vertical direction tends to be stable, and then they gradually float upward under the action of buoyancy. When floating into the horizontal liquid, they flow to the right following the horizontal liquid. When flowing to the partition plate 3, the wax micro-powder particles located in the upper layer of the horizontal liquid enter the upper channel 21 following the upper liquid, and the wax micro-powder particles located in the lower layer of the horizontal liquid enter the lower channel 22 following the lower liquid. Dehydrate and dry the upper liquid and the lower liquid containing wax micro-powder particles respectively, and the grading of the wax micro-powder particles is completed.
[0031] This embodiment also provides a grading process for wax micro-powder particles, including the following steps:
[0032] Place the wax micro-powder particles in the vertical liquid. Under the resistance of the vertical liquid, the velocity of the wax micro-powder particles in the vertical direction tends to be stable. Then, the wax micro-powder particles float upward in the vertical direction under the action of buoyancy. The top of the vertical liquid is communicated with the horizontal liquid, and the wax micro-powder particles gradually move into the horizontal liquid. The particle size of the wax micro-powder particles is between 1 - 100 μm. Both the vertical liquid and the horizontal liquid are water with a temperature between 55 - 90 °C. The wax micro-powder particles are insoluble in water at 55 - 90 °C.
[0033] The wax micro-powder particles move horizontally in the horizontal liquid. After the wax micro-powder particles move a certain distance in the horizontal liquid, the horizontal liquid is separated into an upper liquid and a lower liquid. The wax micro-powder particles floating on the upper layer of the horizontal liquid flow following the upper liquid, and the wax micro-powder particles floating on the lower layer of the horizontal liquid flow following the lower liquid.
[0034] The upper liquid and the lower liquid containing wax micropowder particles are dehydrated and dried respectively. The upper wax micropowder particles are separated from the upper liquid, and the lower wax micropowder particles are separated from the lower liquid, thus completing this process.
[0035] Example 2
[0036] The difference between this example and Example 1 is only that the particle size of the wax micropowder particles in this example is between 100 - 300 μm.
[0037] Example 3
[0038] The difference between this example and Example 1 is only that the particle size of the wax micropowder particles in this example is between 320 - 420 μm.
[0039] Comparative Example
[0040] Comparative Example 1
[0041] The difference between this comparative example and Example 1 is only that the wax micropowder particles are placed in a vertical liquid. Under the resistance of the vertical liquid, the velocity of the wax micropowder particles in the vertical direction tends to be stable. Then, under the buoyancy force, the wax micropowder particles float upward in the vertical direction. The top of the vertical liquid is connected to the horizontal liquid, and the wax micropowder particles gradually move into the horizontal liquid. The particle size of the wax micropowder particles is between 1 - 100 μm. Both the vertical liquid and the horizontal liquid are water with a temperature between 55 - 90 °C, and the wax micropowder particles are insoluble in water at 55 - 90 °C.
[0042] After the wax micropowder particles move into the horizontal liquid, they are immediately separated into an upper liquid and a lower liquid. The wax micropowder particles floating on the upper layer of the horizontal liquid flow with the upper liquid, and the wax micropowder particles floating on the lower layer of the horizontal liquid flow with the lower liquid.
[0043] The upper liquid and the lower liquid containing wax micropowder particles are dehydrated and dried respectively. The upper wax micropowder particles are separated from the upper liquid, and the lower wax micropowder particles are separated from the lower liquid, thus completing this process.
[0044] Comparative Example 2
[0045] The difference between this comparative example and Example 1 is only that the grading device for the wax micropowder particles includes a vertical channel arranged along the vertical direction. A partition plate is welded on the inner wall of the vertical channel. The partition plate is vertically arranged. The space on the left side of the partition plate inside the vertical channel forms a left channel, and the space on the right side of the partition plate inside the vertical channel forms a right channel. The partition plate is located at the top of the vertical channel.
[0046] The working principle of the classification equipment for wax micro-powder particles in this embodiment is as follows: Fill the vertical channel with water, and the water in the vertical channel forms a vertical liquid. The liquid in the left channel forms a left liquid, and the liquid in the right channel forms a right liquid.
[0047] Spray the wax micro-powder particles into the vertical liquid from the bottom of the vertical channel in the vertically upward direction. Under the resistance of the vertical liquid, the velocity of the wax micro-powder particles in the vertical direction tends to be stable, and then they gradually float upward under the action of buoyancy. When floating up to the partition plate, the wax micro-powder particles on the left side of the vertical liquid enter the left channel following the left liquid, and the wax micro-powder particles on the right side of the vertical liquid enter the right channel following the right liquid. Dehydrate and dry the left liquid and the right liquid containing wax micro-powder particles respectively, and the classification of the wax micro-powder particles is completed.
[0048] This embodiment also provides a classification process for wax micro-powder particles, including the following steps:
[0049] Place the wax micro-powder particles in the vertical liquid. Under the resistance of the vertical liquid, the velocity of the wax micro-powder particles in the vertical direction tends to be stable. Then, the wax micro-powder particles float upward in the vertical direction under the action of buoyancy. The particle size of the wax micro-powder particles is between 1 - 100 μm. Both the vertical liquid and the horizontal liquid are water with a temperature between 55 - 90 °C. The wax micro-powder particles are insoluble in water at 55 - 90 °C.
[0050] The vertical liquid is separated into a left liquid and a right liquid. The wax micro-powder particles floating on the left side of the vertical liquid flow following the left liquid, and the wax micro-powder particles floating on the right side of the vertical liquid flow following the right liquid.
[0051] Dehydrate and dry the left liquid and the right liquid containing wax micro-powder particles respectively, separate the left wax micro-powder particles from the left liquid, and separate the right wax micro-powder particles from the right liquid, thus completing this process.
[0052] Comparative Example 3
[0053] The difference between this comparative example and Embodiment 1 is only that the classification equipment for wax micro-powder particles includes a horizontal channel arranged horizontally. A partition plate is welded on the inner wall of the horizontal channel. The partition plate is horizontally arranged. The space above the partition plate inside the horizontal channel forms an upper channel, and the space below the partition plate inside the horizontal channel forms a lower channel. The partition plate is located at the right end of the horizontal channel.
[0054] The working principle of the classification equipment for wax micro-powder particles in this embodiment is as follows: Fill the horizontal channel with water, and the water in the horizontal channel forms a horizontal liquid. The liquid in the upper channel forms an upper liquid, and the liquid in the lower channel forms a lower liquid.
[0055] The wax micro-powder particles are sprayed into the horizontal liquid from the left end of the horizontal channel in the horizontal right direction. Under the resistance of the vertical liquid, the velocity of the wax micro-powder particles in the vertical direction tends to be stable, and then they flow to the right together with the horizontal liquid. When flowing to the partition plate, the wax micro-powder particles located in the upper layer of the horizontal liquid enter the upper channel following the upper liquid, and the wax micro-powder particles located in the lower layer of the horizontal liquid enter the lower channel following the lower liquid. The upper liquid and the lower liquid containing the wax micro-powder particles are respectively dehydrated and dried, thus completing the classification of the wax micro-powder particles.
[0056] This embodiment also provides a classification process for wax micro-powder particles, including the following steps:
[0057] The wax micro-powder particles are placed in the horizontal liquid. Under the resistance of the vertical liquid, the velocity of the wax micro-powder particles in the vertical direction tends to be stable. Then, the wax micro-powder particles flow to the right together with the horizontal liquid. The particle size of the wax micro-powder particles is between 1 - 100 μm. Both the vertical liquid and the horizontal liquid are water with a temperature between 55 - 90 °C. The wax micro-powder particles are insoluble in water at 55 - 90 °C.
[0058] The wax micro-powder particles move in the horizontal direction in the horizontal liquid. After the wax micro-powder particles move a certain distance in the horizontal liquid, the horizontal liquid is separated into an upper liquid and a lower liquid. The wax micro-powder particles floating in the upper layer of the horizontal liquid flow following the upper liquid, and the wax micro-powder particles floating in the lower layer of the horizontal liquid flow following the lower liquid.
[0059] The upper liquid and the lower liquid containing the wax micro-powder particles are respectively dehydrated and dried. The upper wax micro-powder particles are separated from the upper liquid, and the lower wax micro-powder particles are separated from the lower liquid, thus completing this process.
[0060] Comparative Example 4
[0061] The difference between this embodiment and Embodiment 1 is only that when the initial velocity of the wax micro-powder particles in this embodiment gradually drops to 1 mm / s in the vertical liquid, the wax micro-powder particles move into the horizontal liquid.
[0062] Comparative Example 5
[0063] The difference between this embodiment and Embodiment 1 is only that when the initial velocity of the wax micro-powder particles in this embodiment gradually drops to 5 mm / s in the vertical liquid, the wax micro-powder particles move into the horizontal liquid.
[0064] Comparative Example 6
[0065] The difference between this embodiment and Embodiment 1 is only that the solubility of the wax micro-powder particles in this embodiment in water at 55 - 90 °C is 2.26 - 5.45%.
[0066] Performance Detection Test
[0067] For Examples 1 - 3 and Comparative Examples 1 - 6, the following performance detections were carried out:
[0068] The particle size distribution of the wax micro - powder particles obtained by classification of each example and comparative example was detected using a laser particle size analyzer, and the D10 particle size, D50 particle size, and D90 particle size of the wax micro - powder particles were recorded. The detection results are shown in Table 1.
[0069] Table 1
[0070]
[0071] Combining Example 1 and Comparative Examples 1 - 6 and referring to Table 1, it can be seen that the difference in D50 particle size between the upper - layer wax micro - powder particles and the lower - layer wax micro - powder particles in Example 1 is 34, and the difference between the D10 particle size of the upper - layer wax micro - powder particles and the D90 particle size of the lower - layer wax micro - powder particles is 5. Compared with Example 1, the difference in D50 particle size between the upper - layer wax micro - powder particles and the lower - layer wax micro - powder particles in Comparative Examples 1 - 6 is significantly smaller, and the difference between the D10 particle size of the upper - layer wax micro - powder particles and the D90 particle size of the lower - layer wax micro - powder particles is significantly larger. This shows that using the process of Example 1 to classify wax micro - powder particles can separate larger - sized particles from smaller - sized particles during the production process, which helps to improve the classification effect. Moreover, using insoluble wax micro - powder particles and allowing the velocity of the wax micro - powder particles in the vertical liquid to stabilize before entering the horizontal liquid helps to further improve the classification effect.
[0072] Since the production is continuous, the wax micro - powder particles have an initial velocity when entering the vertical liquid. In the stage of initially entering the vertical liquid, perhaps the small particles ejected in the previous second and the large particles ejected in the next second are at the same horizontal plane. Therefore, in the case of continuous production, particle classification cannot be achieved in the vertical liquid stage. Therefore, the D50 particle size of the left - hand side wax micro - powder particles in Comparative Example 2 is the same as that of the right - hand side wax micro - powder particles.
[0073] Combining Examples 1 - 3 and referring to Table 1, it can be seen that the difference in D50 particle size between the upper - layer wax micro - powder particles and the lower - layer wax micro - powder particles in Examples 1 - 3 is relatively large, and the difference between the D10 particle size of the upper - layer wax micro - powder particles and the D90 particle size of the lower - layer wax micro - powder particles is relatively small. This shows that using the processes within the range of Examples 1 - 3 all help to separate larger - sized particles from smaller - sized particles during the production process.
[0074] This specific embodiment is only an interpretation of the present application, and it is not a limitation of the present application. Those skilled in the art can make modifications to this embodiment without creative contributions according to their needs after reading this specification, but as long as they are within the scope of the claims of the present application, they are protected by the patent law.
Claims
1. A classification process for wax micropowder particles, characterized in that: The steps include: The wax micropowder particles are placed in a vertical liquid, and the wax micropowder particles float in the vertical direction under the action of buoyancy, and the top of the vertical liquid is connected with the horizontal liquid, and the wax micropowder particles move into the horizontal liquid; The wax micropowder particles move in the horizontal direction in the lateral liquid, and the end of the lateral liquid is separated into an upper layer of liquid and a lower layer of liquid. The wax micropowder particles floating on the upper layer of the lateral liquid flow with the upper layer of liquid, and the wax micropowder particles floating on the lower layer of the lateral liquid flow with the lower layer of liquid. The upper layer liquid and the lower layer liquid containing the wax micropowder particles are dehydrated and dried respectively, thus completing the classification of the wax micropowder particles.
2. The classification process of wax micropowder particles according to claim 1, characterized in that: The wax micropowder particles are insoluble in the vertical liquid and the horizontal liquid.
3. The classification process of wax micropowder particles according to claim 1, characterized in that: After the wax micropowder particles enter the vertical liquid, the speed of the wax micropowder particles along the vertical direction tends to be stable.
4. An apparatus for classifying wax micropowder particles according to any one of claims 1 to 3, characterized in that: The invention comprises a vertical channel (1) and a transverse channel (2), wherein the vertical channel (1) is arranged in the vertical direction, one end of the transverse channel (2) is fixedly connected to the top of the vertical channel (1), the transverse channel (2) is communicated with the vertical channel (1), the transverse channel (2) is arranged in the horizontal direction, a partition plate (3) is provided in the transverse channel (2), the space above the partition plate (3) in the transverse channel (2) forms an upper channel (21), the space below the partition plate (3) in the transverse channel (2) forms a lower channel (22), and the partition plate (3) is located at one end of the transverse channel (2) away from the vertical channel (1).