Light-transmitting ceramic tile blank, light-transmitting ceramic tile and preparation method

Abstract

The invention provides a light-transmitting ceramic green brick, a light-transmitting ceramic tile and a preparation method, and the light-transmitting ceramic green brick comprises the following raw materials by weight: 30-40% of kaolin, 27-55% of calcined potassium feldspar powder, and 19-33% of barium silicate and / or strontium silicate. The formula of the ceramic green brick provided by the embodiment of the invention is free of carbonate and quartz, free of pores left after the carbonate decomposition reaction of the green body at high temperature, free of refraction increase and pore increase caused by high-temperature unmelted substances, free of glass powder and reduced in high-temperature deformation, and barium silicate and / or strontium silicate and the like are / is directly used for introducing barium and / or strontium; furthermore, pores in the green body are reduced, and the transparency of the light-transmitting ceramic green brick is improved.

Description

Technical Field

[0001] This invention relates to the field of ceramic technology, and in particular to a translucent ceramic brick blank, a translucent ceramic brick, and a method for preparing it. Background Technology

[0002] The crystalline phases in translucent ceramics are mostly quartz, anorthite, and calcium phosphate. Current strontium-aluminum-silicon system translucent ceramic tile formulations primarily consist of kaolin, potassium feldspar, glass powder, barium / strontium carbonate, and quartz. To achieve low-temperature, rapid firing, a relatively large amount of glass powder is added to the system. However, the addition of glass powder results in a lower high-temperature load on the green body. Under open firing conditions in a roller kiln, the product is prone to deformation, and roller marks are visible at both ends under reflective conditions. Furthermore, the pores in the green body are spherical with a circular cross-section, exhibiting obvious pore aggregation. The presence of pores reduces the translucency of the product.

[0003] Therefore, existing technologies have shortcomings and need to be improved and developed. Summary of the Invention

[0004] In view of the shortcomings of the prior art, the purpose of this invention is to provide a translucent ceramic tile blank, a translucent ceramic tile and a preparation method, which aims to avoid deformation of ceramic products and improve the translucency of ceramic products.

[0005] The technical solution adopted by this invention to solve the technical problem is as follows: The first aspect of this application provides a translucent ceramic tile blank, wherein the raw materials of the translucent ceramic tile blank, by weight percentage, include: Kaolin 30-40%, calcined potassium feldspar powder 27-55%, barium silicate and / or strontium silicate 19-33%.

[0006] In one embodiment of this application, the raw materials of the translucent ceramic tile blank, by weight percentage, include: Kaolin 30%, calcined potassium feldspar powder 47%, barium silicate and / or strontium silicate 23%; Alternatively, 35% kaolin, 40% calcined potassium feldspar powder, and 25% barium silicate and / or strontium silicate; Alternatively, 40% kaolin, 29% calcined potassium feldspar powder, and 31% barium silicate and / or strontium silicate.

[0007] A second aspect of this application provides a method for preparing a translucent ceramic tile blank, wherein the method for preparing the translucent ceramic tile blank includes: By weight percentage, 30-40% kaolin, 27-55% calcined potassium feldspar powder, and 19-33% barium silicate and / or strontium silicate are mixed and ball-milled to obtain a slurry; The slurry is spray-granulated to obtain powder; The powder is dry-pressed to form a translucent ceramic brick blank.

[0008] In one embodiment of this application, the preparation steps of the calcined potassium feldspar powder include: The potassium feldspar was finely ground until a residue of 0.2-0.5% was obtained on a 325-mesh sieve, and then dried. Dry potassium feldspar is calcined at a predetermined calcination temperature to obtain calcined material; The calcined material is finely ground to 200 mesh to obtain calcined potassium feldspar powder.

[0009] In one embodiment of this application, the step of determining the calcination temperature includes: The sintering point of potassium feldspar that has been finely ground to a residue of 0.2-0.5% on a 325-mesh sieve and dried was determined. The calcination temperature is determined by measuring the initial shrinkage temperature of potassium feldspar during the sintering process.

[0010] In one embodiment of this application, the calcination temperature is 1130~1160℃.

[0011] In one embodiment of this application, the kaolin is obtained by calcining kaolin raw material at a calcination temperature of 1160℃~1220℃ and a calcination cycle of 45~65 minutes, and then grinding it to 200 mesh.

[0012] A third aspect of this application provides a method for preparing a translucent ceramic tile, wherein the method for preparing the translucent ceramic tile includes: The translucent ceramic brick blank prepared by the above-described method and / or the translucent ceramic brick blank prepared by the above-described method is fed into a roller kiln for firing at a firing temperature of 1175~1195℃ and a firing cycle of 50~58min to obtain translucent ceramic bricks.

[0013] In one embodiment of this application, the water absorption rate of the translucent ceramic tile is less than 0.1%.

[0014] The fourth aspect of this application provides a translucent ceramic tile, wherein the translucent ceramic tile is prepared by the translucent ceramic tile preparation method described above.

[0015] The present invention achieves the following beneficial effects: This application provides a translucent ceramic brick blank, a translucent ceramic brick, and a preparation method thereof. The raw materials of the translucent ceramic brick blank, by weight percentage, include: 30-40% kaolin, 27-55% calcined potassium feldspar powder, and 19-33% barium silicate and / or strontium silicate. The ceramic brick blank formulation of the embodiments of this application does not contain carbonates or quartz, thus eliminating the pores left after the decomposition reaction of carbonates in the blank at high temperatures, the increase in refraction and porosity caused by unmelted materials at high temperatures, and the absence of glass powder, resulting in reduced high-temperature deformation. The direct use of barium silicate and / or strontium silicate to introduce barium and / or strontium further reduces the porosity in the blank and improves the translucency of the translucent ceramic brick blank. Attached Figure Description

[0016] Figure 1 This is a flowchart of a preferred embodiment of the ceramic body preparation method in this invention.

[0017] Figure 2 This is a process flowchart of the ceramic green body preparation method in this invention. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of this invention clearer and more explicit, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0019] The existing formulations of translucent ceramic tiles based on the strontium aluminum silicon system mainly consist of kaolin, potassium feldspar, glass powder, barium / strontium carbonate, and quartz. The pores generated in the translucent ceramic tile body are difficult to fill; possible sources of these pores include: First, the pores in the crystals formed in ceramics. Crystals are formed from kaolin, barium carbonate, and other materials through solid-phase reactions. Kaolin particles smaller than 40 micrometers, after being calcined at high temperatures, release water of crystallization, forming mullite and quartz. Pores exist between these particles, and also within the crystal grains. These pores are extremely small and cannot be filled except by a liquid phase with extremely low viscosity at high temperatures.

[0020] Second, the particle gaps in dry-pressed ceramic tile blanks. Dry pressing further reduces these gaps. However, these gaps must be filled by a high-temperature liquid phase during firing. The higher the filling rate, the closer the bulk density of the blank is to the theoretical bulk density.

[0021] Third, the unfillable pores next to quartz particles. During the development of translucent green bodies, it was found that adding alumina powder and quartz powder to the green body formula did not significantly change the initial shrinkage temperature during calcination, but it greatly increased the temperature at the end of shrinkage and broadened the firing temperature range. Microscopic analysis showed that high aluminum and silicon content phases exceeding the system average could always be found next to the pores in the green body. This clearly demonstrates that alumina powder and quartz powder, especially alumina powder, cannot completely react in the system, resulting in high-temperature unmelted matter in the green body. Moreover, the presence of this unmelted matter increases the porosity in the green body, thereby increasing the refraction of the system and reducing translucency. Therefore, to improve translucency, alumina powder and quartz powder, especially alumina powder, should not be added. Additionally, the addition of approximately 10 wt% quartz to the strontium aluminum silicon system is also a factor affecting translucency.

[0022] Fourth, the pores accumulated in the glassy body of the preform. At high temperatures, the viscosity of the liquid phase decreases, causing small pores to remain due to incomplete filling, and small bubbles to aggregate and become large bubbles.

[0023] Regarding the elimination of porosity, the sintering of translucent ceramic tiles still falls under the category of liquid-phase sintering. Whether liquid-phase sintering can be successfully completed depends on the following factors: First, the wettability of the liquid phase and the solid phase. The smaller the contact angle between the liquid and solid phases, the stronger their wetting ability. The wetting ability of the liquid phase depends on its surface tension in the liquid state; that is, the lower the surface tension, the higher the degree of wetting between the liquid and solid phases. A smaller wetting angle indicates a stronger wetting ability of the liquid phase on the solid phase, which provides capillary force and plays a positive role in the densification process of the system. Adding glass powder to the formulation of translucent ceramic tiles in the strontium-aluminum-silicon system utilizes the excellent wettability of glass in its liquid phase at high temperatures to promote sintering and lower the firing temperature of the translucent ceramic tile blank.

[0024] Secondly, solid phases have a certain solubility in liquid phases, while liquid phases have very low solubility in solid phases, or are insoluble. This means that the solid and liquid phases must be able to react with each other, but the reaction is extremely small. In the formulation of strontium-aluminum-silicon translucent ceramic tiles, there may be low-temperature liquid phases such as glassy liquid phases, feldspar liquid phases, and barium silicate liquid phases. All three can react with mullite to varying degrees to generate new liquid phases. These new liquid phases only have higher viscosity, and therefore cannot fill some pores. This is also an important reason why pores always exist in translucent ceramics.

[0025] Third, a significant amount of liquid phase is required. The higher the volume fraction of the liquid phase in the system, the higher the packing density of the sample and the greater the relative density of the sintered body. Theoretical calculations show that when the liquid phase volume fraction reaches 35%, the material can achieve complete densification solely through particle rearrangement. However, in liquid phase sintering, the liquid phase volume fraction is often 5-15%. If the liquid phase can wet the particles and cover the particle surface in sufficient quantity, the solid particles are separated from each other through the liquid phase layer, greatly reducing the friction between adjacent solid particles. The particles will have a higher migration rate and are more prone to rearrangement. Generally speaking, the higher the liquid phase volume fraction, the faster complete densification is achieved. However, paradoxically, the more low-viscosity liquid phase in a translucent ceramic body, the lower the high-temperature load on the brick body itself, and the easier it is for the brick body to deform during firing.

[0026] Clearly, the smaller the pores in the green body, the more difficult it is to fill them. This is because potassium feldspar, glass powder, and other substances introduced into the formula form a liquid phase at high temperatures. As the reaction proceeds, silicon and aluminum from the kaolin continuously melt into the liquid phase, and its high-temperature viscosity continuously increases. Therefore, it is necessary to minimize the porosity as much as possible before the reaction in the green body takes place. From a macroscopic perspective, this means reducing the loss on ignition of the formula system.

[0027] This invention provides a translucent ceramic tile blank with a jade-like texture, which solves the problem of product deformation during firing in a roller kiln due to the large amount of glass powder used in the translucent ceramic tile blank. It further reduces the porosity of the ceramic tile blank, improves translucency, and enhances the jade-like texture.

[0028] This invention provides a translucent ceramic tile blank, wherein the raw materials of the translucent ceramic tile blank, by weight percentage, include: Kaolin 30-40%, calcined potassium feldspar powder 27-55%, barium silicate and / or strontium silicate 19-33%.

[0029] The translucent ceramic tile body formula of this application uses barium silicate and / or strontium silicate, but no longer uses barium carbonate or strontium carbonate. This is because after the high-temperature decomposition of carbonates, ultrafine pores are left behind. These ultrafine pores cannot be completely filled by a liquid phase with extremely low viscosity at high temperatures (glass powder has low viscosity at high temperatures, but its introduction can easily lead to deformation of the body). The decomposition temperature of barium carbonate is 1450℃, and that of strontium carbonate is 1340℃. Both have relatively high decomposition temperatures. After the glass powder is fired into a liquid phase at low temperatures, a violent reaction occurs at around 950℃, resulting in weight loss and shrinkage in the product. During the sintering of ceramic products, many pores are filled. However, as the reaction proceeds, mullite, silica, and other substances generated from the calcination of kaolin continuously melt into the liquid phase, increasing its high-temperature viscosity and making it difficult to fill the ultrafine pores in the body. Therefore, the best way to reduce this type of pore is to eliminate the use of carbonates altogether.

[0030] The ceramic tile blank formulation of this application embodiment contains no carbonates or quartz, thus eliminating the pores left after the carbonate decomposition reaction at high temperatures, the increased refraction and porosity caused by unmelted materials at high temperatures, the absence of glass powder, reduced high-temperature deformation, and the direct use of barium silicate and / or strontium silicate to introduce barium and / or strontium, thereby reducing the porosity in the blank and improving the translucency of the translucent ceramic tile blank.

[0031] Furthermore, although kaolin has a relatively high loss on ignition, the amount of kaolin used cannot be reduced. Firstly, kaolin itself has extremely fine particles, with very few particles larger than 5 micrometers. Secondly, to ensure the modulus of rupture of the green body, the amount of kaolin used cannot be reduced.

[0032] In this embodiment of the application, the raw materials of the translucent ceramic tile blank, by weight percentage, include: Kaolin 30%, calcined potassium feldspar powder 47%, barium silicate and / or strontium silicate 23%; Alternatively, 35% kaolin, 40% calcined potassium feldspar powder, and 25% barium silicate and / or strontium silicate; Alternatively, 40% kaolin, 29% calcined potassium feldspar powder, and 31% barium silicate and / or strontium silicate.

[0033] Specifically, in the formulation of translucent ceramic tile blanks, barium silicate and strontium silicate have better light transmittance when used alone. When the two are mixed, the light transmittance will decrease because there are more crystal phases with different refractive indices in the blank. The two can be mixed in a molar ratio of 1:1 to achieve better light transmittance.

[0034] like Figure 1 As shown, this application also provides a method for preparing a translucent ceramic brick blank, comprising: Step S100: By weight percentage, mix 30-40% kaolin, 27-55% calcined potassium feldspar powder, and 19-33% barium silicate and / or strontium silicate, and then ball mill to obtain a slurry; Step S200: Spray granulation is performed on the slurry to obtain powder; Step S300: The powder is dry-pressed into shape to obtain a translucent ceramic brick blank.

[0035] Specifically, in this embodiment, kaolin, calcined potassium feldspar powder, barium silicate and / or strontium silicate are mixed according to the formula and then ball-milled. The ball-milled slurry is then spray-granulated to obtain powder, which is then formed by dry pressing to obtain translucent ceramic brick blanks.

[0036] The ceramic tile blank formulation of this application embodiment contains no carbonates or quartz, thus eliminating the pores left after the carbonate decomposition reaction at high temperatures, the increased refraction and porosity caused by unmelted materials at high temperatures, the absence of glass powder, reduced high-temperature deformation, and the direct use of barium silicate and / or strontium silicate to introduce barium and / or strontium, thereby reducing the porosity in the blank and improving the translucency of the translucent ceramic tile blank.

[0037] In one embodiment of this application, the preparation steps of the calcined potassium feldspar powder include: The potassium feldspar was finely ground until a residue of 0.2-0.5% was obtained on a 325-mesh sieve, and then dried. Dry potassium feldspar is calcined at a predetermined calcination temperature to obtain calcined material; The calcined material is finely ground to 200 mesh to obtain calcined potassium feldspar powder.

[0038] Specifically, potassium feldspar is finely ground to a residue of 0.2-0.5% on a 325-mesh sieve, dried, and then calcined in an electric furnace at a temperature of 1130-1160℃. The calcination temperature is maintained at the highest calcination temperature for 80 minutes. After calcination, it is finely ground to a mesh of 200 for later use.

[0039] This application first finely grinds potassium feldspar to a residue of 0.2-0.5% on a 325-mesh sieve, which significantly increases the specific surface area of ​​the potassium feldspar particles, resulting in more uniform heat transfer during subsequent calcination, accelerating the solid-phase reaction, and improving calcination efficiency. The drying step removes free water from the raw materials, preventing particle cracking or structural defects caused by moisture evaporation during calcination, while also reducing energy consumption (avoiding heat loss due to moisture evaporation). The secondary fine grinding to 200 mesh in this application adjusts the particle size of the calcined material, facilitating uniform mixing with other raw materials in the translucent ceramic brick blank.

[0040] The embodiments of this application use calcined potassium feldspar powder, which enables potassium feldspar to participate in the reaction as soon as possible, and also makes the translucent ceramic tile body more transparent.

[0041] In this embodiment of the application, the step of determining the calcination temperature includes: The sintering point of potassium feldspar that has been finely ground to a residue of 0.2-0.5% on a 325-mesh sieve and dried was determined. The calcination temperature is determined by measuring the initial shrinkage temperature of potassium feldspar during the sintering process.

[0042] Specifically, the composition of natural potassium feldspar fluctuates, thus requiring different calcination temperatures. The method used in this application to determine the calcination temperature involves finely grinding the potassium feldspar until a residue of 0.2-0.5% remains on a 325-mesh sieve, drying it, and then measuring its sintering point. Calcination is performed at a temperature 5-10°C above the point at which potassium feldspar begins to shrink. For example, if the temperature at which potassium feldspar begins to shrink, as measured in a sintering point apparatus, is 1140°C, then calcination should be performed at 1145-1150°C. The high-temperature holding time is extended to 80 minutes to ensure complete calcination.

[0043] In determining the sintering point of potassium feldspar, the initial shrinkage temperature refers to the temperature at which the potassium feldspar powder blank begins to show significant volume shrinkage (or a linear shrinkage rate not exceeding 6%) during heating. This temperature is a crucial basis for determining the calcination temperature range. The initial shrinkage temperature marks the beginning of the transformation of the potassium feldspar powder blank from a loose state to a dense state, representing the starting point of the sintering process. The calcination temperature can also be selected within the range from the initial shrinkage temperature to the completion sintering temperature. Within this temperature range, the potassium feldspar powder blank can be fully sintered, achieving a state with minimal porosity, maximum shrinkage, the densest product, and the best performance.

[0044] The embodiments of this application can determine the corresponding calcination temperature for different potassium feldspar raw materials in order to ensure complete calcination.

[0045] In the embodiments of this application, the calcination temperature is 1130~1160℃.

[0046] Specifically, the calcination temperature of potassium feldspar is generally between 1130 and 1160°C, and the calcination time is between 60 and 100 minutes. For example, the calcination temperature is held for 80 minutes at the highest calcination temperature.

[0047] After calcination at 1130~1160℃, the potassium feldspar melt can dissolve some of the decomposition products of kaolin, promoting the nucleation and growth of mullite crystals. Mullite crystals are a key component in ceramic tile blanks that impart mechanical strength and chemical stability, and their formation helps to improve the flexural strength, wear resistance, and chemical corrosion resistance of transparent ceramic tile blanks.

[0048] In the embodiments of this application, the kaolin is obtained by calcining kaolin raw materials at a calcination temperature of 1160℃~1220℃ and a calcination cycle of 45~65 minutes, and then grinding them to 200 mesh.

[0049] In this embodiment, kaolin is calcined at 1160℃~1220℃ for 45~65 minutes, then finely ground to 200 mesh and used in ceramic brick blank formulation. This can significantly improve the physical properties, processing performance and firing quality of the blank, while optimizing production costs and environmental benefits.

[0050] This application also provides a method for preparing a translucent ceramic tile, wherein the method for preparing the translucent ceramic tile includes: The translucent ceramic brick blank prepared by the above-described method and / or the translucent ceramic brick blank prepared by the above-described method is fed into a roller kiln for firing at a firing temperature of 1175~1195℃ and a firing cycle of 50~58min to obtain translucent ceramic bricks.

[0051] Because the formula of this application contains no carbonates or quartz, there are no pores caused by the decomposition of carbonates, and no increased refraction and pores caused by unmelted materials at high temperatures, the translucent ceramic tiles produced have increased translucency.

[0052] In one embodiment of this application, the water absorption rate of the translucent ceramic tile is less than 0.1%.

[0053] Specifically, water absorption rate refers to the percentage of the weight of water absorbed by a ceramic tile after its pores are fully saturated. Ceramic tiles with a water absorption rate of ≤0.1% have an extremely dense internal structure, making it almost impossible for water to penetrate.

[0054] The translucent ceramic tiles prepared in this application meet the stringent standard of water absorption rate ≤0.1% after firing, and their internal quality conforms to the technical specifications for dry-pressed ceramic tiles in Appendix G of GB / T 4100-2015, exhibiting excellent performance.

[0055] This application also provides a translucent ceramic tile, which is prepared by the translucent ceramic tile preparation method described above.

[0056] The following are specific examples for illustration.

[0057] Example 1: The preparation steps of the translucent ceramic brick in this embodiment include: Step A1: Prepare kaolin and calcined potassium feldspar powder; The preparation steps of kaolin include: Kaolin raw material is calcined in a fast-firing roller kiln with an ambient temperature of 1185℃ and a firing cycle of 55min, and then finely ground to 200 mesh to obtain kaolin.

[0058] The preparation steps of calcined potassium feldspar powder include: Potassium feldspar was finely ground to a residue of 0.2-0.5% on a 325-mesh sieve and dried. The sintering point of the dried potassium feldspar was then determined. Based on the initial shrinkage temperature of the potassium feldspar during the sintering point determination process, the calcination temperature was determined to be 1130-1160℃. The feldspar was then calcined in a fast-firing roller kiln at a calcination temperature of 1130-1160℃ for 80 minutes, and held at the highest calcination temperature for 80 minutes. After calcination, the feldspar was further finely ground to a 200-mesh sieve to obtain calcined potassium feldspar powder.

[0059] Step A2: Mix 40% kaolin, 29% calcined potassium feldspar powder and 31% barium silicate by weight percentage, and then ball mill to obtain a slurry. Step A3: Spray granulation of the slurry to obtain powder; Step A4: Dry press the powder into shape to obtain a translucent ceramic tile blank; Step A5: The translucent ceramic brick blank is fed into a roller kiln for firing at a temperature of 1185℃ for a firing cycle of 55 minutes to obtain translucent ceramic bricks.

[0060] The light transmission effect of the translucent ceramic tile in this embodiment is as follows: Figure 2 As shown.

[0061] Example 2: The preparation steps of the translucent ceramic brick in this embodiment include: Step A1: Prepare kaolin and calcined potassium feldspar powder; The preparation steps of kaolin include: Kaolin raw material is calcined in a fast-firing roller kiln with an ambient temperature of 1160℃ and a firing cycle of 45 minutes, and then finely ground to 200 mesh to obtain kaolin.

[0062] The preparation steps of calcined potassium feldspar powder include: Potassium feldspar was finely ground to a residue of 0.2-0.5% on a 325-mesh sieve and dried. The sintering point of the dried potassium feldspar was then determined. Based on the initial shrinkage temperature of the potassium feldspar during the sintering point determination process, the calcination temperature was determined to be 1145-1150℃. The feldspar was then calcined in a fast-firing roller kiln at a calcination temperature of 1145-1150℃ for 60 minutes. After calcination, the feldspar was further finely ground to a mesh size of 200 to obtain calcined potassium feldspar powder.

[0063] Step A2: Mix 30% kaolin, 47% calcined potassium feldspar powder and 23% strontium silicate by weight percentage, and then ball mill to obtain a slurry; Step A3: Spray granulation of the slurry to obtain powder; Step A4: Dry press the powder into shape to obtain a translucent ceramic tile blank; Step A5: The translucent ceramic brick blank is fed into a roller kiln for firing at a temperature of 1175℃ for a firing cycle of 58 minutes to obtain translucent ceramic bricks.

[0064] Example 3: The preparation steps of the translucent ceramic brick in this embodiment include: Step A1: Prepare kaolin and calcined potassium feldspar powder; The preparation steps of kaolin include: Kaolin raw material is calcined in a fast-firing roller kiln with an ambient temperature of 1220℃ and a firing cycle of 65 minutes, and then finely ground to 200 mesh to obtain kaolin.

[0065] The preparation steps of calcined potassium feldspar powder include: Potassium feldspar was finely ground to a residue of 0.2-0.5% on a 325-mesh sieve and dried. The sintering point of the dried potassium feldspar was then determined. Based on the initial shrinkage temperature of the potassium feldspar during the sintering point determination process, the calcination temperature was determined to be 1130-1160℃. The feldspar was then calcined in a fast-firing roller kiln at a calcination temperature of 1130-1160℃ for 100 minutes. After calcination, the feldspar was further finely ground to a mesh size of 200 to obtain calcined potassium feldspar powder.

[0066] Step A2: Mix 35% kaolin, 40% calcined potassium feldspar powder and 25% barium silicate by weight percentage, and then ball mill to obtain a slurry. Step A3: Spray granulation of the slurry to obtain powder; Step A4: Dry press the powder into shape to obtain a translucent ceramic tile blank; Step A5: The translucent ceramic brick blank is fed into a roller kiln for firing at a temperature of 1195℃ for a firing cycle of 50 minutes to obtain translucent ceramic bricks.

[0067] This invention provides a translucent ceramic tile blank, a translucent ceramic tile, and a preparation method thereof. The raw materials of the translucent ceramic tile blank, by weight percentage, include: 30-40% kaolin, 27-55% calcined potassium feldspar powder, and 19-33% barium silicate and / or strontium silicate. The ceramic tile blank formulation of this application contains no carbonates or quartz, eliminating the pores left after the carbonate decomposition reaction at high temperatures, avoiding increased refraction and porosity caused by unmelted materials at high temperatures, and eliminating glass powder, thus reducing high-temperature deformation. The direct use of barium silicate and / or strontium silicate introduces barium and / or strontium, thereby reducing porosity in the blank and improving the translucency of the translucent ceramic tile blank.

[0068] It should be understood that the application of the present invention is not limited to the examples above. Those skilled in the art can make improvements or modifications based on the above description, and all such improvements and modifications should fall within the protection scope of the appended claims.

Claims

1. A light-transmitting ceramic green tile, characterized by, The raw material of the light-transmitting ceramic tile blank comprises, by weight percentage: 30-40% of kaolin, 27-55% of calcined potash feldspar powder, 19-33% of barium silicate and / or strontium silicate.

2. The light-transmitting ceramic green tile according to claim 1, characterized in that, The raw material of the light-transmitting ceramic tile blank comprises, by weight percentage: 30% of kaolin, 47% of calcined potash feldspar powder, 23% of barium silicate and / or strontium silicate; Or, 35% of kaolin, 40% of calcined potash feldspar powder, 25% of barium silicate and / or strontium silicate; Or, 40% of kaolin, 29% of calcined potash feldspar powder, 31% of barium silicate and / or strontium silicate.

3. A method for producing a light-transmitting ceramic green tile, characterized by, The preparation method of the light-transmitting ceramic tile blank comprises: mixing, by weight percentage, 30-40% of kaolin, 27-55% of calcined potash feldspar powder, 19-33% of barium silicate and / or strontium silicate, ball milling to obtain a slurry; spray granulating the slurry to obtain a powder; dry pressing the powder to form a light-transmitting ceramic tile blank.

4. The method of claim 3, wherein the transparent ceramic green tile is prepared by the steps of: The preparation step of the calcined potash feldspar powder comprises: finely grinding potash feldspar to a 325 mesh residue of 0.2-0.5%, and drying; calcining the dried potash feldspar at a predetermined calcination temperature to obtain a calcined material; finely grinding the calcined material to 200 mesh to obtain calcined potash feldspar powder.

5. The method for preparing translucent ceramic brick blanks according to claim 4, characterized in that, The determination step of the calcination temperature comprises: determining the sintering point of the potash feldspar that has been finely ground to a 325 mesh residue of 0.2-0.5% and dried; determining the calcination temperature according to the initial shrinkage temperature of the potash feldspar during the determination of the sintering point.

6. The method for preparing translucent ceramic brick blanks according to claim 4, characterized in that, The calcination temperature is 1130-1160℃.

7. The method of claim 3, wherein the transparent ceramic green tile is prepared by the steps of: preparing a ceramic green tile; and coating the ceramic green tile with a transparent coating layer. The kaolin is obtained by calcining kaolin raw material at a calcination temperature of 1160-1220℃ and a calcination period of 45-65 minutes, and then finely grinding to 200 mesh.

8. A method for producing a light-transmitting ceramic tile, characterized by, The preparation method of the light-transmitting ceramic tile comprises: putting the light-transmitting ceramic tile blank prepared according to any one of claims 1-2 and / or the preparation method of the light-transmitting ceramic tile blank according to any one of claims 3-7 into a roller kiln to be fired at a firing temperature of 1175-1195℃ and a firing period of 50-58 minutes to obtain a light-transmitting ceramic tile.

9. The method of claim 8, wherein the light transmitting ceramic tile is prepared by the steps of: The water absorption of the light-transmitting ceramic tile is less than 0.1%. ​ 10. A light-transmitting ceramic tile, characterized by, The light-transmitting ceramic tile is prepared by the preparation method of the light-transmitting ceramic tile according to any one of claims 8-9.

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