A production process for preparing mixed powder for mixed spot blanks

Abstract

The present invention discloses a production process for a mixed powder for preparing a mixed spot blank, which is suitable for a spray granulation device. The spray granulation device includes a spray tower, a first spray assembly, and a second spray assembly. The production process includes the following steps: preparing a first slurry and a second slurry; spraying the first slurry to the spray tower through the first spray assembly, and spraying the second slurry to the spray tower through the second spray assembly, and opening the spray tower for granulation to obtain a mixed powder for preparing a mixed spot blank. The production process proposed in this scheme allows coarse-grained powder and fine-grained powder to be mixed together, thereby improving the mixing effect of the mixed spot blank, and adopts a spray tower to replace the weighing, batching and mixing steps in the prior art to realize the mixing process of the mixed spot blank, which is conducive to greatly reducing the occupancy rate of the working space and the powder silo, and effectively preventing the powder from being damaged during the transportation process, thereby affecting the pressing quality of the blank.

Description

Technical Field

[0001] The invention relates to the technical field of building ceramics, in particular to a production process of mixed powder for preparing mixed spot blanks. Background Art

[0002] Currently, ceramic tile blanks are generally divided into plain solid-color blanks, mixed-material speckled blanks, and fabric blanks. Mixed-material speckled blanks and fabric blanks are popular among consumers due to their better overall appearance. Mixed-material speckled blanks, in particular, dominate the market due to their simpler mixing process, faster molding and pressing speed, higher production capacity, and lower waste.

[0003] In the prior art, in order to improve the mixing effect of mixed spot blanks, technicians generally use multiple powders of different colors as blank raw materials, and mix the multiple powders to achieve the desired mixing effect through weighing and batching processes before pressing them into ceramic blanks. However, the above mixed spot blank production process has the following drawbacks:

[0004] First, the conventional powder used for preparing mixed spot blanks in the prior art has only one specification, that is, its moisture content and particle size range are fixed, which results in a relatively rough and stiff mixing effect after mixing powders of the same specification but different colors.

[0005] Second, the powder used in the green body is typically produced by spraying and granulating a single slurry in a spray tower. Multiple powders are then weighed and proportioned according to production requirements before being mixed into a mixed powder. If the green body requires multiple powders, the spray tower must repeat the spray granulation process multiple times to produce the desired mix. Each time a spray tower produces a new powder, it must stop, clean, and restart, significantly reducing powder preparation efficiency and resulting in excessive energy consumption. Furthermore, the temporary storage of multiple powders requires significant workspace and numerous powder silos, resulting in low silo turnover and hindering the operation of the raw material workshop.

[0006] Third, the prepared powder generally needs to go through three conveying processes: from the spray tower to a single silo for temporary storage, from the single powder to the mixing silo after weighing, batching and mixing, and from the mixing silo to the press for pressing. The longer the conveying process, the more switching positions between the conveyor belts, the easier it is for the powder to be damaged by the vibration of the conveyor belt, thereby producing more fine powder. When it is finally sent to the pressing process for pressing, it affects the exhaust of the bricks and easily causes stratification of the mixed spot blanks. Sometimes, in order to ensure that the bricks are effectively exhausted, the pressing speed of the press is reduced, thereby affecting production capacity. Summary of the Invention

[0007] The purpose of the present invention is to propose a production process for a mixed powder for preparing a mixed spot blank, so that coarse-grained powder and fine-grained powder are mixed together, thereby improving the mixing effect of the mixed spot blank, and using a spray tower to replace the weighing, batching and mixing steps in the existing technology to realize the mixing process of the mixed spot blank, which is conducive to greatly reducing the working space and the occupancy rate of the powder silo, and effectively avoiding the powder from being damaged during the transportation process, thereby affecting the pressing quality of the blank.

[0008] To achieve this object, the present invention adopts the following technical solutions:

[0009] A production process for preparing a mixed powder for a mixed material spot blank, suitable for a spray granulation device, the spray granulation device comprising a spray tower, a first spray assembly and a second spray assembly, the first spray assembly being used to spray a first slurry into the spray tower, and the second spray assembly being used to spray a second slurry into the spray tower;

[0010] The first spray assembly and the second spray assembly each include a slurry feed pool, a pressure pump, a slurry delivery pipe, and a spray gun connected in sequence; the outlet of the spray gun is located inside the spray tower, and the outlet of the spray gun is toward the top of the spray tower; a plurality of spray guns are provided, and the plurality of spray guns are arranged at intervals around the wall of the spray tower, and the spray guns of the first spray assembly and the spray guns of the second spray assembly are staggered;

[0011] The production process comprises the following steps:

[0012] A. preparing a first slurry and a second slurry, and storing the first slurry in the slurry inlet tank of the first spray assembly, and storing the second slurry in the slurry inlet tank of the second spray assembly;

[0013] B. adjusting parameters of the first spray assembly and the second spray assembly respectively, wherein the parameters of the first spray assembly are different from the parameters of the second spray assembly; spraying the first slurry into the spray tower through the first spray assembly, and simultaneously spraying the second slurry into the spray tower through the second spray assembly, and granulating the slurry in the spray tower to obtain a mixed powder for preparing a mixed spot blank;

[0014] The mixed powder comprises coarse-grained powder and fine-grained powder, the coarse-grained powder is obtained by granulating the first slurry, and the fine-grained powder is obtained by granulating the second slurry;

[0015] The coarse granular powder has a moisture content of 6.6-7.2% by mass, a particle size distribution of 20-mesh sieve residue ≤ 0.8%, 40-mesh sieve residue 55-65%, 60-mesh sieve residue 85-95% and 100-mesh sieve residue ≥ 97%;

[0016] According to mass percentage, the moisture content of the fine particle powder is 0.8-1.2%, and the particle size distribution is 0% on a 20-mesh sieve, 1-3% on a 40-mesh sieve, 40-55% on a 60-mesh sieve, and ≥90% on a 100-mesh sieve.

[0017] Preferably, in step A, the water content of the first slurry is 33-35% by mass, and the water content of the second slurry is 37-39% by mass.

[0018] Preferably, in step B, the aperture of the spray plate of the spray gun of the first spray assembly is 2.8 to 3.2 mm.

[0019] Preferably, in step B, the aperture of the spray plate of the spray gun of the second spray assembly is 1.4 to 1.8 mm.

[0020] Preferably, in step B, the slurry delivery pressure of the pressure pump of the first spray assembly is 0.6-0.8 MPa.

[0021] Preferably, in step B, the slurry delivery pressure of the pressure pump of the second spray assembly is 1.4-1.6 MPa.

[0022] Preferably, the first spray assembly is provided in multiple groups.

[0023] Preferably, the second spray assembly is provided in multiple groups.

[0024] Preferably, the spray granulation device further comprises a mixer, and the mixer is arranged below the discharge port of the spray tower;

[0025] Step B specifically includes the following steps:

[0026] The parameters of the first spray assembly and the second spray assembly are adjusted respectively, wherein the parameters of the first spray assembly are different from the parameters of the second spray assembly; the first slurry is sprayed into the spray tower through the first spray assembly, and the second slurry is sprayed into the spray tower through the second spray assembly, and the spray tower is opened for granulation. The granulated powder is mixed in the mixer to obtain a mixed powder for preparing a mixed spot blank.

[0027] The technical solutions provided by the embodiments of the present application may have the following beneficial effects:

[0028] 1. In the mixed spotted blank, coarse-grained powder and fine-grained powder with specific moisture content and particle size distribution are mixed together, so that the spotted blank has a mixing effect in addition to the effect of the powder itself, enriching the decorative effect of the spotted blank. The mixed powder has both coarse and fine particles, making the mixing effect of the blank more delicate.

[0029] 2. By mixing and spraying the two slurries in a closed spray tower, it can effectively ensure that the ceramic body has an ideal mixing effect, while taking into account the dust problem in the working environment. In addition, the coarse particle powder with higher moisture content and larger particle size after granulation can cover the fine particle powder with lower moisture content and smaller particle size to a certain extent, so as to improve the dust problem of the fine particle powder, thereby further improving the working environment of the mixed spot blank.

[0030] 3. The spray tower can meet the spraying and mixing needs of multiple powders at the same time by opening the tower once, which can effectively reduce the number of times the spray tower is opened, thereby solving the problems of large energy loss and low production efficiency in the production process.

[0031] 4. The use of a spray tower replaces the weighing, batching, and mixing steps in existing technologies to achieve the mixing process of mixed materials into green billets, significantly reducing the operating space and occupancy of the powder silo. This also helps alleviate the dust problem caused by fine-particle powders by reducing the need for powder conveying during the mixing process. Furthermore, the reduction in conveying effectively prevents powder damage during the process of preparing green billets, preventing the quality of the pressed billets from being affected. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 The present invention is a schematic structural diagram of a spray granulation device suitable for use in a production process of a mixed powder for preparing a mixed spot blank.

[0033] Figure 2 yes Figure 1 Enlarged view of point A in the middle.

[0034] Figure 3 This is a green body surface rendering of Example 1 in a production process of a mixed powder for preparing a mixed spotted blank according to the present invention.

[0035] Figure 4 This is a green body surface rendering of Example 2 in a production process of a mixed powder for preparing a mixed spotted blank according to the present invention.

[0036] Figure 5 This is a green blank surface effect diagram of Example 3 in a production process of mixed powder for preparing mixed spotted blanks of the present invention.

[0037] Among them: spray tower 1, first spray assembly 2, slurry inlet pool 21, pressure pump 22, slurry delivery pipe 23, spray gun 24, second spray assembly 3, mixer 4. DETAILED DESCRIPTION

[0038] The present technical solution provides a production process for preparing a mixed powder for a mixed material spot blank, which is suitable for a spray granulation device, wherein the spray granulation device includes a spray tower 1, a first spray assembly 2, and a second spray assembly 3. The first spray assembly 2 is used to spray a first slurry into the spray tower 1, and the second spray assembly 3 is used to spray a second slurry into the spray tower 1.

[0039] The first spray assembly 2 and the second spray assembly 3 each include a slurry feed pool 21, a pressure pump 22, a slurry delivery pipe 23, and a spray gun 24 connected in sequence; the outlet of the spray gun 24 is located inside the spray tower 1, and the outlet of the spray gun 24 is toward the top of the spray tower 1; a plurality of spray guns 24 are provided, and the plurality of spray guns 24 are arranged at intervals around the tower wall of the spray tower 1, and the spray guns 24 of the first spray assembly 2 and the spray guns 24 of the second spray assembly 3 are staggered.

[0040] The production process comprises the following steps:

[0041] A. Prepare a first slurry and a second slurry, and store the first slurry in the slurry inlet pool 21 of the first spray assembly 2, and store the second slurry in the slurry inlet pool 21 of the second spray assembly 3;

[0042] B. adjusting the parameters of the first spray assembly 2 and the second spray assembly 3 respectively, wherein the parameters of the first spray assembly 2 are different from the parameters of the second spray assembly 3; spraying the first slurry into the spray tower 1 through the first spray assembly 2, and simultaneously spraying the second slurry into the spray tower 1 through the second spray assembly 3, and granulating the slurry in the spray tower 1 to obtain a mixed powder for preparing a mixed material spot blank;

[0043] The mixed powder comprises coarse-grained powder and fine-grained powder, the coarse-grained powder is obtained by granulating the first slurry, and the fine-grained powder is obtained by granulating the second slurry;

[0044] The coarse granular powder has a moisture content of 6.6-7.2% by mass, a particle size distribution of 20-mesh sieve residue ≤ 0.8%, 40-mesh sieve residue 55-65%, 60-mesh sieve residue 85-95% and 100-mesh sieve residue ≥ 97%;

[0045] According to mass percentage, the moisture content of the fine particle powder is 0.8-1.2%, and the particle size distribution is 0% on a 20-mesh sieve, 1-3% on a 40-mesh sieve, 40-55% on a 60-mesh sieve, and ≥90% on a 100-mesh sieve.

[0046] In the prior art, in order to improve the mixing effect of mixed spot blanks, technicians generally use a variety of powders of different colors as blank raw materials, and mix the various powders into the desired mixing effect through weighing and batching processes and then press them into ceramic blanks. However, the above-mentioned mixed spot blank production process has the defects of rough and stiff blank mixing effect, high energy consumption of the spray tower, high occupancy rate of the working space and powder silo, and easy stratification of the mixed spot blank.

[0047] In order to overcome the defects of the prior art, the present invention proposes a production process for preparing mixed powder for mixed spot blanks, which is suitable for Figure 1-2 The spray granulation device shown includes a spray tower 1, a first spray assembly 2, and a second spray assembly 3. The first spray assembly 2 and the second spray assembly 3 each include a slurry feed tank 21, a pressure pump 22, a slurry delivery pipe 23, and a spray gun 24, which are connected in sequence. Specifically, the production process of this solution first prepares the first slurry and the second slurry, then sprays the first slurry into the spray tower 1 through the first spray assembly 2, and simultaneously sprays the second slurry into the spray tower 1 through the second spray assembly 3. The spray tower 1 is then turned on to perform granulation to obtain a mixed powder with a specific moisture content and particle size distribution.

[0048] It should be noted that in the production process of this solution, the blank formula used to prepare the first slurry and the second slurry is a blank formula commonly used in the ceramic field, and the above blank formula can be selected from conventional ceramic raw materials according to the actual production requirements of the blank to be formulated into blank formulas with different colors, different whiteness, or with opacifying effects, transparent effects, etc., without limitation here, so as to enrich the mixing effect of the mixed spot blank. In addition, since the coarse particle powder and the fine particle powder in the production process are sprayed and granulated at the same time, the ratio of the coarse particle powder and the fine particle powder can be adjusted according to the actual required mixing effect by the number of spray guns in the corresponding spray assembly, which is conducive to simplifying the weighing and batching process of the mixed spot blank.

[0049] Furthermore, the mixed powder with a specific moisture content and particle size distribution in this solution can be achieved by adjusting any one or more of the moisture content of the corresponding slurry, the operating parameters of the spray tower 1 or the setting parameters of the corresponding spray assembly, which are not limited here.

[0050] Compared with the production process in the prior art of first preparing single powders separately and then preparing mixed powders through weighing, batching and mixing steps, the production process of mixed powders proposed in this solution has the following advantages:

[0051] First, this solution uses coarse-grained powder and fine-grained powder with specific moisture content and particle size distribution to mix in the mixed spot blank. The two slurries collide with each other in the spray tower 1, and a part of the slurry forms powder according to its own effect, while the other part of the slurry merges with each other to form a mixed effect, thereby adding a mixed effect to the spot blank in addition to the effect of the powder itself, enriching the decorative effect of the spot blank. Moreover, because the mixed powder prepared in this solution has two different particle size distributions of coarse and fine, the mixed powder has both coarse and fine particles, making the mixing effect of the blank more delicate. Furthermore, this solution preferably sets the moisture content of the coarse-grained powder to 6.6-7.2% and the moisture content of the fine-grained powder to 0.8-1.2%. On the one hand, this can prevent the granular powder from having too much moisture content and sticking together into fine clumps, resulting in the granular powder being not fine enough and affecting the product's blank effect. On the other hand, it can reduce the generation of fine powder during transportation while ensuring the particle size distribution, thereby avoiding the delamination of the blank after pressing.

[0052] Second, the powder commonly used in existing ceramic blanks is generally spray-granulated by a spray tower device. However, since the moisture content of the fine-particle powder used in this solution is lower than that of the powder obtained by conventional spray granulation, and its particle size range is smaller than that of the powder obtained by conventional spray granulation, the fine-particle powder with extremely low moisture content and extremely small particle size range is very likely to cause serious dust problems during multi-stage transportation and multi-stage mixing processes, thereby worsening the working environment of ceramic production and affecting the health of workers. Therefore, the fine-particle powder proposed in this solution cannot be spray-granulated by spray tower 1 alone. In order to ensure that the ceramic blank has an ideal mixing effect while taking into account the dust problem in the working environment, this solution uses a mixed spray of two slurries, so that the coarse-particle powder with higher moisture content and larger particle size after granulation can cover the fine-particle powder with lower moisture content and smaller particle size to a certain extent, thereby improving the dust problem of the fine-particle powder, thereby further improving the working environment of the mixed-particle blank.

[0053] Third, the spray granulation device and production process of this solution can meet the spraying and mixing needs of multiple powders by opening the spray tower 1 once, which can effectively reduce the number of times the spray tower is opened, thereby solving the problems of large energy loss and low production efficiency generated in the production process.

[0054] Fourth, because this solution uses a spray tower to complete the mixing process of the mixed material and green billet, replacing the weighing, batching, and mixing steps in the prior art, it significantly reduces the operating space and powder silo occupancy rate. This also helps alleviate the dust problem caused by fine-particle powders by reducing the need for powder transportation during the mixing process. Furthermore, this reduction in transportation effectively prevents powder damage during the process of preparing the green billet, preventing it from affecting the pressing quality of the green billet.

[0055] To further illustrate, in step A, the water content of the first slurry is 33-35% by mass, and the water content of the second slurry is 37-39% by mass.

[0056] The working principle of spray tower granulation is that a slurry is sprayed into the interior of spray tower 1 using a spray gun 24 under the action of a pressure pump 22. The slurry is then formed into numerous small droplets within the spray tower 1. The small droplets are then dehydrated and dried by the hot air within the spray tower 1, forming powder particles containing a certain amount of moisture. Generally speaking, assuming the operating parameters of the spray tower 1 and the spray assembly remain unchanged, the greater the moisture content of the slurry, the smaller the particle size of the sprayed powder particles. This is because the greater the moisture content of the slurry, the lower its solids content (the amount of dry sand and mud). As the slurry is subsequently atomized into droplets, the water evaporates during the high-temperature hot air dehydration process, leaving less dry material in the droplets. Consequently, the resulting powder particles are also smaller in size and may even be prone to forming fine powder, causing dust. Therefore, in order to take into account the required particle size of the powder and avoid the increase of dust, and considering that a slurry with higher moisture content is likely to lead to higher energy consumption of the spray tower 1 during spray granulation, and is also likely to cause the moisture content of the granulated powder to be too high and stick to the mold core during the green body pressing process, the water content of the first slurry is preferably 33-35%, and the water content of the second slurry is preferably 37-39%.

[0057] To further illustrate, in step B, the aperture of the spray plate of the spray gun 24 of the first spray assembly 2 is 2.8 to 3.2 mm.

[0058] To further illustrate, in step B, the aperture of the spray plate of the spray gun 24 of the second spray assembly 3 is 1.4-1.8 mm.

[0059] Furthermore, the larger the aperture of the spray gun's nozzle, the larger the particle size of the powder particles sprayed out. This is because the larger the aperture of the spray gun, the more slurry passes through the spray gun per unit time. If the pressure of the spray gun is not adjusted, the spray height of the slurry will be reduced accordingly, and the droplets formed will become larger, and the droplets will be exposed to less high-temperature hot air. Under this influence, only the water on the surface of the droplets evaporates, which easily causes the powder particle size formed by the droplets to shrink and become smaller, and the diameter of the finished powder particles after granulation becomes larger.

[0060] Since in the production process of this scheme, the moisture content of the slurry and the corresponding spray plate aperture of the spray gun 24 will cause the particle size of the finished powder, therefore, in order to ensure that this scheme obtains powder with a specific particle size distribution, this scheme preferably sets the spray plate aperture of the spray gun 24 of the first spray assembly 2 to 2.8~3.2mm, and the spray plate aperture of the spray gun 24 of the second spray assembly 3 to 1.6mm.

[0061] Preferably, in step B, the aperture of the spray plate of the spray gun 24 of the first spray assembly 2 is 3.0 mm, and the aperture of the spray plate of the spray gun 24 of the second spray assembly 3 is 1.6 mm.

[0062] To further illustrate, in step B, the slurry delivery pressure of the pressure pump 22 of the first spray assembly 2 is 0.6-0.8 MPa.

[0063] To further illustrate, in step B, the slurry delivery pressure of the pressure pump 22 of the second spray assembly 3 is 1.4-1.6 MPa.

[0064] Furthermore, the slurry delivery pressure of the pressure pump 22 directly affects the spraying height of the slurry. Since the spraying height of the slurry is related to the dehydration effect of the droplets, this solution comprehensively adjusts the moisture content of the slurry, the nozzle aperture of the corresponding spray gun 24, and the slurry delivery pressure of the corresponding pressure pump 22 to adjust the particle size distribution of the finished powder, which is more conducive to obtaining powder with an ideal particle size distribution.

[0065] Preferably, in step B, the slurry delivery pressure of the pressure pump 22 of the first spray assembly 2 is 0.7 MPa, and the slurry delivery pressure of the pressure pump 22 of the second spray assembly 3 is 1.5 MPa.

[0066] To further explain, the first spray assembly 2 is provided in multiple groups.

[0067] To further explain, the second spray assembly 3 is provided in multiple groups.

[0068] In a preferred embodiment of the present technical solution, multiple groups of first spray assemblies 2 and second spray assemblies 3 are provided. The production process of the present solution can also prepare blank formulas of different colors, different whiteness, or with opacifying effects and transparent effects into corresponding second slurries of the first slurry, and spray out a first slurry of a blank formula in the form of a group of first spray assemblies 2, and spray out a second slurry of a blank formula in the form of a group of second spray assemblies 3, so that multiple groups of first spray assemblies 2 and multiple groups of second spray assemblies 3 simultaneously spray out the corresponding second slurries of the first slurry, so as to obtain mixed spot blanks with higher richness and more types.

[0069] To further illustrate, the spray granulation device further includes a mixer 4, which is arranged below the discharge port of the spray tower 1;

[0070] Step B specifically includes the following steps:

[0071] The parameters of the first spray assembly 2 and the second spray assembly 3 are adjusted respectively, wherein the parameters of the first spray assembly 2 are different from the parameters of the second spray assembly 3; the first slurry is sprayed into the spray tower 1 through the first spray assembly 2, and the second slurry is sprayed into the spray tower 1 through the second spray assembly 3, and the spray tower 1 is opened for granulation. The granulated powder is mixed in the mixer 4 to obtain a mixed powder for preparing a mixed spot blank.

[0072] In another preferred embodiment of the present invention, the spray granulation device further includes a mixer 4 for mixing the powder particles, thereby further improving the mixing effect of the mixed powder after spray granulation. It should be noted that the mixer 4 is a conventional mixing device in the ceramic field and is not limited here.

[0073] The technical solution of the present invention is further illustrated below through specific implementation methods.

[0074] Example 1

[0075] The spray granulation device includes a spray tower 1, a group of first spray assemblies 2 and a group of second spray assemblies 3; the first spray assembly 2 and the second spray assembly 3 both include a slurry inlet pool 21, a pressure pump 22, a slurry delivery pipe 23 and a spray gun 24 connected in sequence; the outlet of the spray gun 24 is located inside the spray tower 1, and the outlet of the spray gun 24 is toward the top of the spray tower 1; the number of spray guns 24 of the first spray assembly 2 is 5, and the number of spray guns 24 of the second spray assembly 3 is 15. Multiple spray guns 24 are arranged at intervals around the tower wall of the spray tower 1, and the spray guns 24 of the first spray assembly 2 and the spray guns 24 of the second spray assembly 3 are staggered.

[0076] The mixed powder is prepared by the spray granulation device through the following steps:

[0077] A. Prepare a first slurry using a raw material formula of a conventional white blank in the ceramic field, and prepare a second slurry using a raw material formula of a conventional black blank in the ceramic field. Then adjust the first slurry and the second slurry to the water content shown in Table 1 below, and store the first slurry in the first spray assembly 2, and store the second slurry in the second spray assembly 3;

[0078] B. Adjust the aperture of the spray piece of the spray gun 24 of the first spray assembly 2, the aperture of the spray piece of the spray gun 24 of the second spray assembly 3, the slurry delivery pressure of the pressure pump 22 of the first spray assembly 2, and the slurry delivery pressure of the pressure pump 22 of the second spray assembly 3 to the parameters shown in Table 1 below; spray the first slurry into the spray tower 1 through the first spray assembly 2, and spray the second slurry into the spray tower 1 through the second spray assembly 3, and start the spray tower 1 for granulation. The powder after granulation After the materials are mixed in the mixer 4, a mixed powder including coarse particle powder (the moisture content of which is shown in Table 1 below, and the particle size distribution is 20 mesh sieve residue ≤ 0.8%, 40 mesh sieve residue 55-65%, 60 mesh sieve residue 85-95% and 100 mesh sieve residue ≥ 97%) and fine particle powder (the moisture content of which is shown in Table 1 below, and the particle size distribution is 20 mesh sieve residue 0%, 40 mesh sieve residue 1-3%, 60 mesh sieve residue 40-55% and 100 mesh sieve residue ≥ 90%) is obtained.

[0079] C. The mixed powder obtained in step B is pressed into a green body through a conventional pressing process of a ceramic body. The green body has no delamination phenomenon, and the surface effect of the green body is as follows: Figure 3 shown.

[0080] Example 2

[0081] The spray granulation device includes a spray tower 1, a group of first spray assemblies 2 and a group of second spray assemblies 3; the first spray assembly 2 and the second spray assembly 3 both include a slurry inlet pool 21, a pressure pump 22, a slurry delivery pipe 23 and a spray gun 24 connected in sequence; the outlet of the spray gun 24 is located inside the spray tower 1, and the outlet of the spray gun 24 is toward the top of the spray tower 1; the number of spray guns 24 of the first spray assembly 2 is 10, and the number of spray guns 24 of the second spray assembly 3 is 10. Multiple spray guns 24 are arranged at intervals around the tower wall of the spray tower 1, and the spray guns 24 of the first spray assembly 2 and the spray guns 24 of the second spray assembly 3 are staggered.

[0082] The mixed powder is prepared by the spray granulation device through the following steps:

[0083] A. Prepare a first slurry using a raw material formula of a conventional white blank in the ceramic field, and prepare a second slurry using a raw material formula of a conventional black blank in the ceramic field. Then adjust the first slurry and the second slurry to the water content shown in Table 1 below, and store the first slurry in the first spray assembly 2, and store the second slurry in the second spray assembly 3;

[0084] B. Adjust the aperture of the spray piece of the spray gun 24 of the first spray assembly 2, the aperture of the spray piece of the spray gun 24 of the second spray assembly 3, the slurry delivery pressure of the pressure pump 22 of the first spray assembly 2, and the slurry delivery pressure of the pressure pump 22 of the second spray assembly 3 to the parameters shown in Table 1 below; spray the first slurry into the spray tower 1 through the first spray assembly 2, and spray the second slurry into the spray tower 1 through the second spray assembly 3, and start the spray tower 1 for granulation. The powder after granulation After the materials are mixed in the mixer 4, a mixed powder including coarse particle powder (the moisture content of which is shown in Table 1 below, and the particle size distribution is 20 mesh sieve residue ≤ 0.8%, 40 mesh sieve residue 55-65%, 60 mesh sieve residue 85-95% and 100 mesh sieve residue ≥ 97%) and fine particle powder (the moisture content of which is shown in Table 1 below, and the particle size distribution is 20 mesh sieve residue 0%, 40 mesh sieve residue 1-3%, 60 mesh sieve residue 40-55% and 100 mesh sieve residue ≥ 90%) is obtained.

[0085] C. The mixed powder obtained in step B is pressed into a green body through a conventional pressing process of a ceramic body. The green body has no delamination phenomenon, and the surface effect of the green body is as follows: Figure 4 shown.

[0086] Example 3

[0087] The spray granulation device includes a spray tower 1, a group of first spray assemblies 2 and a group of second spray assemblies 3; the first spray assembly 2 and the second spray assembly 3 both include a slurry inlet pool 21, a pressure pump 22, a slurry delivery pipe 23 and a spray gun 24 connected in sequence; the outlet of the spray gun 24 is located inside the spray tower 1, and the outlet of the spray gun 24 is toward the top of the spray tower 1; the number of spray guns 24 of the first spray assembly 2 is 5, and the number of spray guns 24 of the second spray assembly 3 is 15. Multiple spray guns 24 are arranged at intervals around the tower wall of the spray tower 1, and the spray guns 24 of the first spray assembly 2 and the spray guns 24 of the second spray assembly 3 are staggered.

[0088] The mixed powder is prepared by the spray granulation device through the following steps:

[0089] A. Prepare a first slurry using a raw material formula of a conventional black blank in the ceramic field, and prepare a second slurry using a raw material formula of a conventional white blank in the ceramic field. Then adjust the first slurry and the second slurry to the water content shown in Table 1 below, and store the first slurry in the first spray assembly 2, and store the second slurry in the second spray assembly 3;

[0090] B. Adjust the aperture of the spray piece of the spray gun 24 of the first spray assembly 2, the aperture of the spray piece of the spray gun 24 of the second spray assembly 3, the slurry delivery pressure of the pressure pump 22 of the first spray assembly 2, and the slurry delivery pressure of the pressure pump 22 of the second spray assembly 3 to the parameters shown in Table 1 below; spray the first slurry into the spray tower 1 through the first spray assembly 2, and spray the second slurry into the spray tower 1 through the second spray assembly 3, and start the spray tower 1 for granulation. The powder after granulation After the materials are mixed in the mixer 4, a mixed powder including coarse particle powder (the moisture content of which is shown in Table 1 below, and the particle size distribution is 20 mesh sieve residue ≤ 0.8%, 40 mesh sieve residue 55-65%, 60 mesh sieve residue 85-95% and 100 mesh sieve residue ≥ 97%) and fine particle powder (the moisture content of which is shown in Table 1 below, and the particle size distribution is 20 mesh sieve residue 0%, 40 mesh sieve residue 1-3%, 60 mesh sieve residue 40-55% and 100 mesh sieve residue ≥ 90%) is obtained.

[0091] C. The mixed powder obtained in step B is pressed into a green body through a conventional pressing process of a ceramic body. The green body has no delamination phenomenon, and the surface effect of the green body is as follows: Figure 5 shown.

[0092] Table 1 Relevant process parameters of Examples 1-3

[0093]

[0094]

[0095] The mixed powder obtained by the production process of mixed powder for preparing mixed spotted blanks in this scheme has no stratification phenomenon in the green blank body after pressing, and it is mixed with coarse particle powder and fine particle powder, so that the mixing effect on the surface of the green blank body is coarse and fine, making the mixing effect more delicate.

[0096] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components and / or combinations thereof.

[0097] Unless otherwise specifically stated, the relative arrangement of the parts and steps, the numerical expressions and the numerical values ​​set forth in these embodiments do not limit the scope of the present invention. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the drawings are not drawn according to the actual proportional relationship. The techniques, methods and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, the techniques, methods and equipment should be considered as part of the authorization specification. In all examples shown and discussed here, any specific values ​​should be interpreted as being merely exemplary and not as limiting. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that similar numbers and letters represent similar items in the following figures, and therefore, once an item is defined in one figure, it does not need to be further discussed in subsequent figures.

[0098] In the description of the present invention, it should be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "horizontal, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention; the directional words "inside and outside" refer to the inside and outside relative to the outline of each component itself.

[0099] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used herein to describe the spatial positional relationship of a device or feature to other devices or features as shown in the figures. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figures. For example, if the device in the drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0100] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the present invention.

[0101] It should be noted that the terms "first," "second," and the like in the specification and claims of this application and the accompanying drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or precedence. It should be understood that the terms used in this manner are interchangeable where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than that illustrated or described herein.

[0102] The technical principles of the present invention have been described above with reference to specific embodiments. These descriptions are intended solely to illustrate the principles of the present invention and are not to be construed in any way as limiting the scope of protection of the present invention. Based on the explanations herein, those skilled in the art will readily conceive of other specific embodiments of the present invention without inventive effort, and such embodiments will fall within the scope of protection of the present invention.

Claims

1. A production process for preparing a mixed powder for a mixed spot blank, characterized in that: Applicable to a spray granulation device, the spray granulation device comprising a spray tower, a first spray assembly and a second spray assembly, the first spray assembly being used to spray a first slurry into the spray tower, and the second spray assembly being used to spray a second slurry into the spray tower; The first spray assembly and the second spray assembly each include a slurry feed pool, a pressure pump, a slurry delivery pipe, and a spray gun connected in sequence; the outlet of the spray gun is located inside the spray tower, and the outlet of the spray gun is toward the top of the spray tower; a plurality of spray guns are provided, and the plurality of spray guns are arranged at intervals around the wall of the spray tower, and the spray guns of the first spray assembly and the spray guns of the second spray assembly are staggered; The production process comprises the following steps: A. preparing a first slurry and a second slurry, and storing the first slurry in the slurry inlet tank of the first spray assembly, and storing the second slurry in the slurry inlet tank of the second spray assembly; B. adjusting parameters of the first spray assembly and the second spray assembly respectively, wherein the parameters of the first spray assembly are different from the parameters of the second spray assembly; spraying the first slurry into the spray tower through the first spray assembly, and simultaneously spraying the second slurry into the spray tower through the second spray assembly, and granulating the slurry in the spray tower to obtain a mixed powder for preparing a mixed spot blank; The mixed powder comprises coarse-grained powder and fine-grained powder, the coarse-grained powder is obtained by granulating the first slurry, and the fine-grained powder is obtained by granulating the second slurry; The coarse granular powder has a moisture content of 6.6-7.2% by mass, a particle size distribution of 20-mesh sieve residue ≤ 0.8%, 40-mesh sieve residue 55-65%, 60-mesh sieve residue 85-95% and 100-mesh sieve residue ≥ 97%; The fine particle powder has a moisture content of 0.8-1.2% by mass, and a particle size distribution of 0% on a 20-mesh sieve, 1-3% on a 40-mesh sieve, 40-55% on a 60-mesh sieve, and ≥90% on a 100-mesh sieve. In step A, the water content of the first slurry is 33-35% by mass, and the water content of the second slurry is 37-39% by mass; In step B, the aperture of the spray plate of the spray gun of the first spray assembly is 2.8~3.2mm, and the aperture of the spray plate of the spray gun of the second spray assembly is 1.4~1.8mm; the slurry delivery pressure of the pressure pump of the first spray assembly is 0.6~0.8MPa, and the slurry delivery pressure of the pressure pump of the second spray assembly is 1.4~1.6MPa.

2. A production process for preparing a mixed powder for mixed spot blanks according to claim 1, characterized in that: The first spray components are provided in multiple groups.

3. The production process of a mixed powder for preparing a mixed spot blank according to claim 1, characterized in that: The second spray assembly is provided in multiple groups.

4. The production process of a mixed powder for preparing a mixed spot blank according to claim 1, characterized in that: The spray granulation device further comprises a mixer, which is arranged below the discharge port of the spray tower; Step B specifically includes the following steps: The parameters of the first spray assembly and the second spray assembly are adjusted respectively, wherein the parameters of the first spray assembly are different from the parameters of the second spray assembly; the first slurry is sprayed into the spray tower through the first spray assembly, and the second slurry is sprayed into the spray tower through the second spray assembly, and the spray tower is opened for granulation. The granulated powder is mixed in the mixer to obtain a mixed powder for preparing a mixed spot blank.

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