Ceramic slurry preparation method

Abstract

The invention relates to a preparation method of ceramic slurry, which is characterized in that the ceramic slurry comprises the following raw materials: 12-14 parts of silica sand powder; 7-9 parts of chinastone powder; 4-7 parts of kaolin powder; 30 to 34 parts of plastic clay powder; 31 to 35 parts of calcined coal gangue powder; 0.12 to 0.25 part of sodium tripolyphosphate; 0.2 to 0.5 part of sodium silicate; 14 to 18 parts of feldspar powder; 4-5 parts of zirconium dioxide; 18 to 32 parts of water; the silica sand powder, the chinastone powder, the kaolin, the plastic clay powder, the calcined coal gangue powder, the zirconium dioxide and the water are mixed with the mixed powder obtained in the first step according to the weight. According to the invention, the homogeneity of the green body material can be improved, so that the firing quality of the green body is improved.

Description

Technical Field

[0001] This invention relates to the field of ceramic slurry technology, and more specifically to a method for preparing ceramic slurry. Background Technology

[0002] The preparation of ceramic slurry is a complex technology that combines materials science, colloid chemistry, and process experience. Successful slurry requires meticulous formulation design, strict raw material control, standardized operating procedures, thorough impurity removal, sufficient aging, and precise monitoring and adjustment of key performance parameters. Repeated experimentation and experience accumulation in practice are crucial for obtaining high-quality slurry that meets specific requirements.

[0003] In the prior art, due to the presence of tiny cavities in the mixed slurry, the gas inside the tiny cavities expands during the sintering of the preform, affecting the uniformity of the preform material and thus affecting the sintering quality of the preform. Summary of the Invention

[0004] The purpose of this invention is to provide a method for preparing ceramic slurry, which can improve the homogeneity of the green body material, thereby improving the firing quality of the green body.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] A method for preparing ceramic slurry, the ceramic slurry comprising the following raw materials:

[0007] 12-14 parts of silica sand powder;

[0008] 7-9 parts of porcelain stone powder;

[0009] 4-7 parts of kaolin powder;

[0010] 30-34 parts of plastic clay powder;

[0011] 31-35 parts of calcined coal gangue powder;

[0012] Sodium tripolyphosphate 0.12-0.25 parts;

[0013] Sodium silicate 0.2-0.5 parts;

[0014] 14-18 parts feldspar powder;

[0015] 4-5 parts of zirconium dioxide;

[0016] 18-32 parts water;

[0017] The method for preparing ceramic slurry includes the following steps:

[0018] Step 1: Mix the above-mentioned amount of feldspar powder with sodium silicate. After mixing evenly, calcine at 1000-1200℃. Crush the calcined and cooled finished product to obtain mixed powder with a particle size of less than 20μm.

[0019] Step 2: Mix the above-mentioned amounts of silica sand powder, porcelain stone powder, kaolin, plastic clay powder, calcined coal gangue powder, zirconium dioxide, and water with the mixed powder from Step 1, and ball mill to obtain a coarse slurry with a particle size of less than 10μm.

[0020] Step 3: Stir the coarse slurry and then age it. During the aging process, add the above-mentioned amount of sodium tripolyphosphate, heat the slurry, and continue stirring to obtain ceramic slurry for grouting.

[0021] Specifically, in step one, calcination is carried out under a reducing atmosphere of hydrogen and nitrogen.

[0022] Specifically, in step one, the calcination time is 40 minutes.

[0023] Specifically, the aging process in step three takes more than three days.

[0024] Specifically, the stirring time in step three is more than three hours.

[0025] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0026] Step 1: Mix the above-mentioned amount of feldspar powder with sodium silicate. After mixing evenly, calcine at 1000-1200℃. Crush the calcined and cooled finished product to obtain mixed powder with a particle size of less than 20μm.

[0027] Step 2: Mix the above-mentioned amounts of silica sand powder, porcelain stone powder, kaolin, plastic clay powder, calcined coal gangue powder, zirconium dioxide, and water with the mixed powder from Step 1, and ball mill to obtain a coarse slurry with a particle size of less than 10μm.

[0028] Step 3: Stir the coarse slurry and then age it. During the aging process, add the above-mentioned amount of sodium tripolyphosphate, heat the slurry, and continue stirring to obtain ceramic slurry for grouting.

[0029] In existing technologies, the presence of micro-cavities in the mixed slurry leads to gas expansion within these cavities during green body sintering, affecting the uniformity of the green body material and thus impacting the sintering quality. To improve the homogeneity of the green body material, this solution utilizes zirconium dioxide:

[0030] After mixing with the slurry, zirconium dioxide is incorporated into the silica sand powder, porcelain stone powder, kaolin, plastic clay powder, and calcined coal gangue powder. The zirconium dioxide melts with the alumina components of these powders to form a eutectic. This eutectic adheres to the surface of the other raw material particles, further accelerating the melting of oxide components on the surfaces of these powders, thus lowering the sintering temperature of the green body. The eutectic formed by the melting of zirconium dioxide and alumina flows along the surface of the solid particles under tension, filling the gaps between particles and squeezing out some air from tiny cavities, improving the homogeneity of the green body materials and thus enhancing the firing quality of the green body. Detailed Implementation

[0031] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0032] A method for preparing ceramic slurry, characterized in that the ceramic slurry comprises the following raw materials:

[0033] 12-14 parts of silica sand powder;

[0034] 7-9 parts of porcelain stone powder;

[0035] 4-7 parts of kaolin powder;

[0036] 30-34 parts of plastic clay powder;

[0037] 31-35 parts of calcined coal gangue powder;

[0038] Sodium tripolyphosphate 0.12-0.25 parts;

[0039] Sodium silicate 0.2-0.5 parts;

[0040] 14-18 parts feldspar powder;

[0041] 4-5 parts of zirconium dioxide;

[0042] 18-32 parts water;

[0043] The method for preparing ceramic slurry includes the following steps:

[0044] Step 1: Mix the above-mentioned amount of feldspar powder with sodium silicate. After mixing evenly, calcine at 1000-1200℃. Crush the calcined and cooled finished product to obtain mixed powder with a particle size of less than 20μm.

[0045] Step 2: Mix the above-mentioned amounts of silica sand powder, porcelain stone powder, kaolin, plastic clay powder, calcined coal gangue powder, zirconium dioxide, and water with the mixed powder from Step 1, and ball mill to obtain a coarse slurry with a particle size of less than 10μm.

[0046] Step 3: Stir the coarse slurry and then age it. During the aging process, add the above-mentioned amount of sodium tripolyphosphate, heat the slurry, and continue stirring to obtain ceramic slurry for grouting.

[0047] Specifically, in step one, calcination is carried out under a reducing atmosphere of hydrogen and nitrogen.

[0048] Specifically, in step one, the calcination time is 40 minutes.

[0049] Specifically, the aging process in step three takes more than three days.

[0050] Specifically, the stirring time in step three is more than three hours.

[0051] The beneficial effects of this invention are:

[0052] Step 1: Mix the above-mentioned amount of feldspar powder with sodium silicate. After mixing evenly, calcine at 1000-1200℃. Crush the calcined and cooled finished product to obtain mixed powder with a particle size of less than 20μm.

[0053] Step 2: Mix the above-mentioned amounts of silica sand powder, porcelain stone powder, kaolin, plastic clay powder, calcined coal gangue powder, zirconium dioxide, and water with the mixed powder from Step 1, and ball mill to obtain a coarse slurry with a particle size of less than 10μm.

[0054] Step 3: Stir the coarse slurry and then age it. During the aging process, add the above-mentioned amount of sodium tripolyphosphate, heat the slurry, and continue stirring to obtain ceramic slurry for grouting.

[0055] In existing technologies, the presence of micro-cavities in the mixed slurry leads to gas expansion within these cavities during green body sintering, affecting the uniformity of the green body material and thus impacting the sintering quality. To improve the homogeneity of the green body material, this solution utilizes zirconium dioxide:

[0056] After mixing with the slurry, zirconium dioxide is incorporated into the silica sand powder, porcelain stone powder, kaolin, plastic clay powder, and calcined coal gangue powder. The zirconium dioxide melts with the alumina components of these powders to form a eutectic. This eutectic adheres to the surface of the other raw material particles, further accelerating the melting of oxide components on the surfaces of these powders, thus lowering the sintering temperature of the green body. The eutectic formed by the melting of zirconium dioxide and alumina flows along the surface of the solid particles under tension, filling the gaps between particles and squeezing out some air from tiny cavities, improving the homogeneity of the green body materials and thus enhancing the firing quality of the green body.

[0057] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A method of preparing a ceramic slurry, characterized by, The ceramic slurry comprises the following raw materials: Silica sand powder 12-14 parts; Porcelain stone powder 7-9 parts; Kaolin powder 4-7 parts; Plastic clay powder 30-34 parts; Calcined coal gangue powder 31-35 parts; Sodium tripolyphosphate 0.12-0.25 parts; Sodium silicate 0.2-0.5 parts; Feldspar powder 14-18 parts; Zirconium dioxide 4-5 parts; Water 18-32 parts; The ceramic slurry preparation method comprises the following steps: Step one: mix the feldspar powder and sodium silicate in the above-mentioned proportions, uniformly mix, calcine at 1000-1200℃, crush the cooled product, and obtain a mixed powder with a particle size less than 20μm; Step two: mix the silica sand powder, porcelain stone powder, kaolin, plastic clay powder, calcined coal gangue powder, zirconium dioxide, water, and the mixed powder of step one, and ball mill to obtain a coarse slurry with a particle size less than 10μm; Step three: stir the coarse slurry, then age, and in the aging process, add the sodium tripolyphosphate in the above-mentioned proportion, heat the slurry, and continue stirring to obtain a ceramic slurry for grouting.

2. The method of claim 1, wherein: In step one, the calcination is carried out under a reducing atmosphere of hydrogen and nitrogen.

3. The method of claim 1, wherein: In step one, the calcination time is 40min.

4. The method of claim 1, wherein: The aging time in step three is more than three days.

5. The method of claim 1, wherein: The stirring time in step three is more than three hours.