Preparation Method of Colored Ceramic Powder and Filter Press with Color Mixing Function

Abstract

The present invention relates to the technical field of ceramic tile manufacturing, in particular to a preparation method of ceramic colored powder materials; the method includes the steps: S1, preparing a formulated material according to a formula, putting it into a ball mill, ball milling it into a raw pulp, removing iron and sieving; S2, color mixing, pumping the raw pulp and the raw pulp and / or color paste of other colors into different positions in a pressure filtration chamber through different feed pumps respectively; S3, dehydrating to form a color-mixed filter cake with a water content lower than 20%; by pumping the raw pulp and the raw pulp and / or color paste of other different colors into the pressure filtration chamber, the raw pulp of different colors or the raw pulp and the color paste of other colors are pumped into the pressure filtration chamber from different positions, and collide and mix in the pressure filtration chamber, and color mixing is carried out under the pressure of the feed pump and the pressure of the water filtration of the filter press. Finally, the colors formed on the filter cake have a gradient color effect, and the types of colors are rich. For the ceramic tiles fired with this powder material, their textures are natural, the colors are diverse, and the colors are natural and soft.

Description

Technical Field

[0001] The present invention relates to the technical field of ceramic tile manufacturing, in particular to a preparation method of ceramic colored powder and a filter press with a color mixing function. Background Art

[0002] Currently, the well-known all-through production technology of ceramic tiles mainly includes wet color matching and dry color mixing processes.

[0003] The wet color matching process is a complete set of systems, including ball mills, spray towers, underground slurry pools, etc. After adding colorants, all equipment will be contaminated. If other different colored powders need to be produced, cleaning is required, resulting in high labor intensity, high production costs, and large pollution. Moreover, the amount prepared at one time is too large. If the production output is inaccurate, one or more colored powders will be left unused after production conversion, thus pressing the powder bin and grouting pool, resulting in low utilization rates of the powder and equipment.

[0004] The dry process has relatively obvious advantages. Only a single white material needs to be prepared in the ball mill and spray tower, with less waste and no need for cleaning, and the amount can be prepared as needed. However, in the existing dry color mixing technology of colorants, the colorants need to be pre-prepared and then stirred with the base material. There is a sequence in the stirring of the base material and colorants, and the process cycle is long. After the colorants and the base material are mixed in the mixer, the colorants of various pigments are prone to concentration, the colorants are relatively rigid, and the color development is not bright enough, resulting in blurred color patterns and textures of the later formed ceramic tiles, affecting the decorative effect of the ceramic tiles.

[0005] In the prior art, the purpose of wet color matching and dry color mixing is to obtain uniformly colored powder. However, uniform color mixing has become a shortcoming in imitating the textures and colors naturally formed in nature, such as marble-like ceramic tiles and granular tiles. The textures of the ceramic tiles produced by this method are rigid and the colors are unnatural. Most of the existing technologies improve in the fabric aspect in order to obtain more natural textures and colors. This method increases the processes and correspondingly raises the costs. Although the texture and color effects have been improved to some extent, the problems of rigidity and unnaturalness still cannot be solved.

[0006] Therefore, it is necessary to provide a more efficient, natural color matching effect and more environmentally friendly method and device for mixing ceramic powder to solve the above problems. Summary of the Invention

[0007] The object of the present invention is to provide a more efficient, natural color matching effect and more environmentally friendly method for mixing ceramic powder and a filter press with a color mixing function.

[0008] To achieve the above functions, the technical solution provided by the present invention is:

[0009] A preparation method of ceramic colored powder, comprising the following steps:

[0010] S1. Prepare the raw materials into a formulated material according to the formula, put it into a ball mill, grind it into a raw pulp, remove iron and sieve it;

[0011] S2. Mix colors. Pump the raw pulp and the raw pulp and / or color paste of other colors into different positions in the filter press chamber through different feed pumps respectively, so that the slurries of different colors collide and mix in the filter press chamber;

[0012] S3. Dehydrate to form a color-mixed filter cake with a water content of less than 20%, and the color-mixed filter cake has a gradient color;

[0013] S4. Crush the color-mixed filter cake into colored mud;

[0014] S5. Conduct low-temperature drying on the colored mud to make its water content reach the predetermined water content;

[0015] S6. Granulate to obtain colored powder with a particle size meeting the requirements.

[0016] Preferably, the whiteness of the formulated material in step S1 is 30 degrees to 40 degrees.

[0017] Preferably, a plurality of slurry inlet holes are arranged around the filter press chamber.

[0018] Preferably, the feed pump is a metering pump.

[0019] Preferably, the predetermined water content in step S6 is 7% to 10%.

[0020] Preferably, the slurry inlet holes at the same position of a plurality of the filter press chambers are connected to the same slurry inlet pipe.

[0021] Preferably, the feeding speeds of different color pastes are different.

[0022] The present invention also provides a filter press with a color mixing function. The filter press with a color mixing function is used for the color mixing process in step S2 of the above-mentioned preparation method of ceramic colored powder, and it includes: a plurality of filter plates and more than 2 slurry inlet pipes;

[0023] Both sides of the filter plate are concave, and every two adjacent filter plates form a filter press chamber;

[0024] Filter cloths are arranged on both sides of the filter plate, round holes are arranged in the middle, and at least two slurry inlet holes are arranged around;

[0025] Feeding pumps are arranged on the slurry inlet pipes, and the slurry inlet pipes extend to different positions in the filter press chamber.

[0026] The beneficial effects of the present invention are as follows:

[0027] 1. In the present invention, the original pulp is pumped into the filter press chamber together with other original pulps and / or color pastes of different colors. The pulps of different colors are pumped into the filter press chamber from different positions, collide and mix in the filter press chamber, and color mixing occurs under the pressure of the feed pump and the pressure of water filtration by the filter press. Eventually, the color formed on the filter cake has a gradient color effect, with a rich variety of colors. The tiles fired with this powder material have natural textures, diverse colors, and the colors are natural and soft.

[0028] 2. The color mixing process of the present invention is combined with the filter press process in the existing low-temperature powder making process, without adding a new filter press and process with color mixing function. Therefore, the color mixing efficiency is higher and more energy-saving.

[0029] 3. The present invention does not require pre-preparation of color mixing slurries. Therefore, it will not cause pollution to ball mills, underground slurry tanks, etc. As a result, the cost of cleaning equipment is low. In addition, the color pastes of the present invention can be prepared immediately according to the production needs, and there is no situation of powder pressing bins and slurry pressing ponds in the wet color matching process. Therefore, the utilization rate of the equipment is high. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a schematic structural diagram of Embodiment 2;

[0031] Figure 2 It is a schematic structural diagram of the filter plate. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0032] The following further elaborates on the present invention in conjunction with the attached Figure 1 and the attached Figure 2 : Embodiment 1:

[0033] A method for preparing a ceramic colored powder material includes the following steps:

[0034] S1. Prepare the raw materials into a formulated material according to the formula, put it into a ball mill, grind it into the original pulp, remove iron, and pass through a sieve;

[0035] S2. Color mixing: Pump the original pulp and the original pulps and / or color pastes of other colors into different positions of the filter press chamber through different feed pumps respectively;

[0036] S3. Dehydration: Form a color mixed filter cake with a water content of less than 20%;

[0037] S4. Crush the color mixed filter cake into colored mud;

[0038] S5. Conduct low-temperature drying on the colored mud to make its water content reach the predetermined water content;

[0039] S6. Granulate to obtain colored powder materials with particle sizes meeting the requirements.

[0040] For ease of explanation, we refer to the formula feedstock prepared according to the formula as the formula material, and the slurry obtained after ball milling the formula material as the original slurry; the slurry formed by adding colorant to water and stirring is called the color slurry; the original slurry and the color slurry are collectively referred to as the slurry. When mixing colors, two or more different color slurries are mixed, and at least one of these slurries is the original slurry.

[0041] In order to achieve a better color development effect for the fired product, the whiteness of the formula material in step S1 is 30 degrees to 40 degrees.

[0042] A plurality of slurry inlet holes are provided around the pressure filtration chamber. Generally, we can set the corresponding number of slurry inlet holes around the pressure filtration chamber according to the amount of slurry required for the powder to be produced, and we generally adopt a uniformly distributed manner along the circumference of the pressure filtration chamber to set the slurry inlet holes. The slurry inlet holes at the same position of multiple pressure filtration chambers are connected to the same slurry inlet pipe.

[0043] In this embodiment, the feed pump 5 is a metering pump. By using a metering pump, we can conveniently control the ratio between various slurries.

[0044] The predetermined water content in step S5 is 7% - 10%. For this colored mud with such a water content, after granulation, we can directly press the brick blank or send it into the aging bin for aging.

[0045] In addition, we can also achieve a more diverse color mixing effect by controlling the different feeding speeds of different slurries into the pressure filtration chamber.

[0046] Taking the production of imitation natural granite tiles as an example, in the traditional color mixing process, generally, brown powder particles (colorant) and light gray ceramic powder (base material) are stirred evenly, then spread and pressed into a brick blank. The tiles produced by this method have a rigid and unnatural surface texture, and the stirring process is time-consuming and power-consuming. In this embodiment, as Figure 2 shown, we pass the light gray original slurry with a particle size meeting the requirements after ball milling into the pressure filtration chamber of the filter press through the slurry inlet hole in the upper left corner, and also turn the brown powder particles into slurry and enter the pressure filtration chamber through the slurry inlet hole in the upper right corner of the filter plate 2 of the filter press. The light gray original slurry flows rapidly along the lower right (as shown by the solid arrow) and the brown color slurry flows rapidly along the lower left (as shown by the hollow arrow). In the pressure filtration chamber, they collide and blend. After being pressed into a filter cake, the filter cake forms a color effect with light gray in the upper left corner and brown in the upper right corner of the pressure filtration chamber, and two colors interact and gradually change in the middle and lower part along the flow direction of the slurry. After this filter cake is dried, granulated, pressed into a brick blank and then fired into tiles, its colors are diverse, the colors are soft, and the texture is natural.

[0047] Example Two:

[0048] This embodiment provides a filter press with a color mixing function. The filter press with a color mixing function is used to implement the color mixing process in step S2 of the method for preparing ceramic colored powder in Embodiment 1.

[0049] As Figure 1 shown, a filter press with a color mixing function includes a hydraulic device 1, a plurality of filter plates 2, more than two slurry inlet pipes 3, and a slurry tank 4.

[0050] Both sides of the filter plate 2 are concave, and every two adjacent filter plates 2 form a filter pressing chamber;

[0051] Filter cloths are arranged on both sides of the filter plate 2. As Figure 2 shown, more than two slurry feeding holes 21 are arranged around the filter plate 2. The slurry feeding holes at the same position in multiple filter pressing chambers are connected to the same slurry inlet pipe 3.

[0052] The number of slurry tanks 4 matches the number of raw slurry and color slurry; each slurry tank 4 is connected to the filter pressing chamber through a slurry inlet pipe 3, and a feeding pump 5 is arranged on the slurry inlet pipe 3.

[0053] In this embodiment, the number of slurry inlet pipes 3 is two. The two slurry inlet pipes 3 are respectively arranged on the left and right sides of the filter press with a color mixing function. Among them, the raw slurry is connected to the slurry inlet pipe 3 formed by the slurry feeding hole 21 in the upper left of the filter plate 2 through the slurry inlet pipe 3 on the left side, and the color slurry is connected to the slurry inlet pipe 3 formed by the slurry feeding hole 21 in the upper right of the filter plate 2 through the slurry inlet pipe 3 on the right side.

[0054] The above embodiments are only preferred examples of the present invention and do not limit the scope of implementation of the present invention. Therefore, all equivalent changes or modifications made according to the structure, features, and principles described in the scope of the patent application of the present invention should be included in the scope of the patent application of the present invention.

Claims

1. A method for preparing a colored ceramic powder, characterized in that: It includes the following steps: S1. Prepare the formula materials according to the formula, put them into a ball mill, grind them into raw pulp, remove iron and sieve; S2. Mix colors. Pump the raw pulp and / or color paste of other colors into different positions in the pressure filtration chamber through different feed pumps respectively, so that the slurries of different colors collide and mix in the pressure filtration chamber; S3. Dehydrate to form a color-mixed filter cake with a water content of less than 20%, and the color-mixed filter cake has a gradient color; S4. Crush the color-mixed filter cake into colored mud; S5. Conduct low-temperature drying on the colored mud to make its water content reach the predetermined water content; S6. Granulate to obtain colored powder with a particle size meeting the requirements.

2. The preparation method of the colored ceramic powder as described in claim 1, wherein: In step S1, the whiteness of the formula material is 30 degrees to 40 degrees.

3. The preparation method of the colored ceramic powder as claimed in claim 1, wherein: A plurality of slurry inlet holes are arranged around the pressure filtration chamber.

4. The preparation method of the colored ceramic powder as described in claim 1, characterized in that: The feed pump is a metering pump.

5. The preparation method of the colored ceramic powder as described in claim 1, characterized in that: In step S6, the predetermined water content is 7% to 10%.

6. The preparation method of the colored ceramic powder as described in claim 1, wherein: The slurry inlet holes at the same position of a plurality of the pressure filtration chambers are communicated with the same slurry inlet pipe.

7. The preparation method of the colored ceramic powder according to claim 6, characterized in that: The feeding speeds of different color pastes are different.

8. A filter press with a color mixing function, characterized in that: The pressure filter with a color mixing function is used to implement the color mixing process in step S2 of the preparation method of the ceramic colored powder according to any one of claims 1 to 7, and it includes: a plurality of filter plates and more than 2 slurry inlet pipes; Both sides of the filter plate are concave, and every two adjacent filter plates form a pressure filtration chamber; Filter cloths are arranged on both sides of the filter plate, round holes are arranged in the middle, and at least two slurry inlet holes are arranged around; Feed pumps are arranged on the slurry inlet pipes, and the slurry inlet pipes extend to different positions in the pressure filtration chamber.

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