Preparation method of light-transmitting ceramic tile of strontium-aluminum-silicon system and light-transmitting ceramic tile

Abstract

The present invention provides a method for preparing a light-transmitting ceramic tile of a strontium-aluminum-silicon system and the light-transmitting ceramic tile. The method for preparing the light-transmitting ceramic tile of the strontium-aluminum-silicon system includes: selecting a target raw material formula from a pre-constructed raw material formula table according to the specifications of the light-transmitting ceramic tile to be prepared; preparing the light-transmitting ceramic tile according to the target raw material formula; wherein, the raw material formula table includes a number of raw material formulas, and the raw materials in each raw material formula include: kaolin, strontium carbonate, potassium feldspar, low-temperature frit, strontium feldspar and / or quartz, and the weight percentages of kaolin in each raw material formula are different. In the present invention, during the calcination process, kaolin forms strontium feldspar with a refractive index extremely close to that of anorthite with strontium carbonate, and strontium feldspar can form strontium adularia with a refractive index closer to that of quartz with potassium-sodium feldspar at high temperature. In this way, mullite no longer exists in the ceramic tile blank, thereby improving the light transmittance of the blank.

Description

Technical Field

[0001] The present invention relates to the technical field of ceramic production, and particularly to a method for preparing a light-transmitting ceramic tile of a strontium aluminosilicate system and the light-transmitting ceramic tile. Background Art

[0002] Ceramics are sintered bodies of fine polycrystals, mainly composed of crystal grains, grain boundaries, glass phases, pores, impurities, etc. Due to the existence of light reflection, refraction and scattering, ceramics appear opaque. To make ceramics transparent like glass, the prerequisite is to make light pass through.

[0003] Kaolin, feldspar, and quartz are the main raw materials of traditional ceramic bodies. After high-temperature calcination of kaolin, mullite is finally formed, and the refractive index of mullite is 1.63 - 1.69, which is greater than 0.1 different from the refractive index of 1.5 of the glass formed after calcination of potassium and sodium feldspar. The more mullite in the body, the higher the degree of opacification of the body. That is to say, in the body formula, the higher the content of kaolin, the more mullite crystal phase will be formed after high-temperature calcination, and the higher the degree of opacification of the body will be. This is one of the fundamental reasons for the opacification of traditional ceramic bodies. Therefore, the existing transparent ceramics can only achieve a relatively low light transmittance.

[0004] Therefore, the existing technology has defects and needs to be improved and developed. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a method for preparing a light-transmitting ceramic tile of a strontium aluminosilicate system and the light-transmitting ceramic tile in view of the above-mentioned defects of the existing technology, aiming to solve the problem that the existing transparent ceramics can only achieve a relatively low light transmittance.

[0006] The technical solution adopted by the present invention to solve the technical problem is as follows:

[0007] The first aspect embodiment of the present application provides a method for preparing a light-transmitting ceramic tile of a strontium aluminosilicate system, wherein the method includes:

[0008] Select a target raw material formula from a pre-constructed raw material formula table according to the specifications of the light-transmitting ceramic tile to be prepared;

[0009] Prepare the light-transmitting ceramic tile according to the target raw material formula;

[0010] Wherein, the raw material formula table includes several raw material formulas, and the raw materials in each raw material formula include: kaolin, strontium carbonate, potassium feldspar, low-temperature frit, strontium feldspar and / or quartz, and the weight percentages of kaolin in each raw material formula are different.

[0011] In an embodiment of the present application, the sum of the weight percentages of potassium feldspar and low-temperature frit in each raw material formula is 25 - 35%.

[0012] In one embodiment of the present application, the chemical components of the low-temperature frit, by weight percentage, include:

[0013] SiO2 70 - 72%, Al2O3 1 - 3%, Fe2O3 0 - 0.2%, TiO2 0 - 0.05%, CaO 5 - 10%, MgO 3 - 5%, K2O 0 - 1.5%, Na2O 8 - 16%, and the balance is loss on ignition;

[0014] Alternatively, the chemical components of the low-temperature frit, by weight percentage, include:

[0015] SiO2 50 - 60%, Al2O3 2 - 3%, Fe2O3 0 - 0.2%, TiO2 0 - 0.05%, CaO 0 - 0.5%, MgO 0 - 0.5%, SrO 8 - 12%, K2O 0 - 5%, Na2O 8 - 16%, and the balance is loss on ignition;

[0016] Alternatively, the chemical components of the low-temperature frit, by weight percentage, include:

[0017] SiO2 50 - 60%, Al2O3 2 - 3%, Fe2O3 0 - 0.2%, TiO2 0 - 0.05%, CaO 0 - 0.5%, MgO 0 - 0.5%, SrO 8 - 12%, K2O 0 - 5%, Na2O 8 - 16%, MoO3 0 - 2%, and the balance is loss on ignition.

[0018] In one embodiment of the present application, the preparation steps of the strontium feldspar include:

[0019] Preparing kaolin, strontium carbonate and potassium feldspar according to a predetermined raw material formula, and the firing temperature is 1450°C - 1500°C.

[0020] In one embodiment of the present application, the chemical components of the strontium feldspar, by weight percentage, include:

[0021] SiO2 26 - 31%, Al2O3 20 - 21%, Fe2O3 0.15 - 0.25%, TiO2 0 - 0.05%, CaO 0 - 0.2%, MgO 0 - 0.2%, SrO 30 - 35%, K2O 0 - 1.4%, Na2O 0 - 0.5%, and the balance is loss on ignition.

[0022] In one embodiment of the present application, the raw material formula in the raw material formula table, by weight percentage, includes:

[0023] Kaolin 20%, strontium carbonate 11 - 13%, potassium feldspar + low - temperature frit 25 - 35%, strontium feldspar and / or quartz 32 - 44%;

[0024] Kaolin 25%, strontium carbonate 14 - 16%, potassium feldspar + low - temperature frit 25 - 35%, strontium feldspar and / or quartz 24 - 36%;

[0025] Kaolin 30%, strontium carbonate 17 - 19%, potassium feldspar + low - temperature frit 25 - 35%, strontium feldspar and / or quartz 16 - 28%;

[0026] Kaolin 35%, strontium carbonate 20 - 22%, potassium feldspar + low - temperature frit 25 - 35%, strontium feldspar and / or quartz 8 - 20%;

[0027] Kaolin 40%, strontium carbonate 23 - 25%, potassium feldspar + low - temperature frit 25 - 35%, strontium feldspar and / or quartz 0 - 12%;

[0028] Kaolin 45%, strontium carbonate 26 - 28%, potassium feldspar + low - temperature frit 20 - 30%, strontium feldspar and / or quartz 0 - 9%.

[0029] In an embodiment of the present application, before selecting the target raw material formula from the pre - constructed raw material formula table according to the specifications of the light - transmissive ceramic tile to be prepared, it further includes:

[0030] Establishing the correspondence between the specifications and the weight percentage of kaolin.

[0031] In an embodiment of the present application, selecting the target raw material formula from the pre - constructed raw material formula table according to the specifications of the light - transmissive ceramic tile to be prepared includes:

[0032] Finding the above - mentioned correspondence according to the specifications of the light - transmissive ceramic tile to be prepared to obtain the target weight percentage of kaolin;

[0033] Selecting the target raw material formula corresponding to the target weight percentage of kaolin in the pre - constructed raw material formula table.

[0034] In an embodiment of the present application, preparing the light - transmissive ceramic tile according to the target raw material formula includes:

[0035] Mixing each raw material according to the target raw material formula, adding water and additives for wet ball - milling;

[0036] Screening and removing iron from the ball - milled raw materials and performing spray - drying treatment to obtain powder;

[0037] Pressing the powder into a green body, drying the green body, and spraying water on the surface of the dried green body;

[0038] Apply the base glaze and the surface glaze to the green body after spraying water, and fire the glazed green body in a kiln at a ring temperature of 1130 °C to 1200 °C to obtain a light-transmitting ceramic tile;

[0039] Among them, the ring temperature is inversely proportional to the addition amount of the low-temperature frit.

[0040] This application also provides a light-transmitting ceramic tile, wherein the light-transmitting ceramic tile is prepared by the method for preparing a light-transmitting ceramic tile of the strontium aluminosilicate system as described above.

[0041] The present invention discloses a method for preparing a light-transmitting ceramic tile of the strontium aluminosilicate system and a light-transmitting ceramic tile. The method for preparing the light-transmitting ceramic tile of the strontium aluminosilicate system includes: selecting a target raw material formula from a pre-constructed raw material formula table according to the specifications of the light-transmitting ceramic tile to be prepared; preparing the light-transmitting ceramic tile according to the target raw material formula; wherein, the raw material formula table includes several raw material formulas, and the raw materials in each raw material formula include: kaolin, strontium carbonate, potassium feldspar, low-temperature frit, strontium feldspar and / or quartz, and the weight percentages of kaolin in each raw material formula are different. In the present invention, during the calcination process of kaolin, strontium feldspar which is extremely close to the refractive index of anorthite is formed with strontium carbonate, and strontium anorthite can further form strontium ice feldspar which is closer to the refractive index of quartz with potassium-sodium feldspar at high temperature. In this way, mullite no longer exists in the ceramic tile green body, thereby improving the light transmittance of the green body. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 is a flowchart of a preferred embodiment of a method for preparing a light-transmitting ceramic tile of the strontium aluminosilicate system in the present invention.

[0043] Figure 2 is a laser particle size analysis diagram of the fineness of the blank in a preferred embodiment of a method for preparing a light-transmitting ceramic tile of the strontium aluminosilicate system in the present invention.

[0044] Figure 3 is a light transmission effect diagram of the light-transmitting ceramic tile prepared by the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0045] To make the purpose, technical solutions and advantages of the present invention clearer and more definite, the following further describes the present invention in detail with reference to the accompanying drawings and by way of examples. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0046] The light transmittance of ceramics is mainly affected by the following factors:

[0047] 1. Porosity. The pores and holes existing within the grains and in the grain boundary glass phase constitute the second phase: the gas phase. The refractive index of the gas phase is very low, approximately 1. The refractive index difference from the main crystal phase in the ceramic is often large, and the quantity is extremely large. Therefore, the existence of pores will greatly reduce the transparency of the material. When the pore volume accounts for 3%, the transmittance is 0.01%; when the pore volume accounts for 0.3%, the transmittance is 10%. Therefore, for transparent ceramics, the density must be increased and the porosity must be reduced. Generally, the density is greater than 99.9%.

[0048] 2. Impurity phase. Due to the different refractive indices of the impurity phase and the main crystal phase, light scattering will occur at the phase boundary, reducing the transmittance of the ceramic. The light transmission of ceramics depends to a large extent on the refractive index difference between its constituent phases. The greater the difference and the larger the number of impurity phases in the ceramic, the lower its light transmittance. Therefore, generally, high-purity raw materials are selected for transparent ceramics to ensure the purity of their phases.

[0049] 3. Crystal structure characteristics. The grain orientations of polycrystalline ceramic materials are chaotic. For non-cubic crystals, only when the grain orientations are the same can the light transmittance of the ceramic be increased. Disordered and chaotic grain arrangements will lead to a decrease in transparency. Grains of the cubic crystal system have no anisotropy, and the refractive index difference along the optical axis direction is zero, so it may have a relatively high light transmittance.

[0050] 4. Grain size. When the grain size is comparable to the wavelength of the incident light wave, the light will undergo the maximum scattering. Therefore, to increase the transmittance of the ceramic, the grain size of the material should be outside the range of the wavelength of the visible light spectrum (0.4 - 0.8 micrometers). Either less than the light wave wavelength, that is, the grain size is less than 0.4 micrometers; or greater than the light wave wavelength, that is, the grain size is greater than 0.8 micrometers.

[0051] 5. Grain boundary. The grain boundaries of transparent ceramics are clean, clear, and very narrow. If there is a certain refractive index difference between the grain boundary and the grains, it will affect the transmittance. Transparent ceramics require clean grain boundaries without segregation of secondary phases.

[0052] 6. Surface processing roughness. The transmittance of transparent ceramics is restricted by the surface roughness. The greater the surface roughness of the sintered ceramic, the lower its light transmittance.

[0053] Kaolin, feldspar, and quartz are the main raw materials for traditional ceramic bodies. After high-temperature calcination of kaolin, mullite is finally formed, and the refractive index of mullite is 1.63 - 1.69, which is much greater than 0.1 compared with the refractive index of 1.5 of the glass formed after calcination of potassium and sodium feldspar. The more mullite in the body, the higher the degree of devitrification of the body. That is to say, in the body formula, the higher the content of kaolin, the more mullite crystal phase will be formed after high-temperature calcination, and the higher the degree of devitrification of its body will be. This is one of the fundamental reasons for the devitrification of traditional ceramic bodies.

[0054] Potassium feldspar and sodium feldspar are calcined at high temperature to form glass with a refractive index of 1.5, which only differs by 0.05 from the refractive index of quartz (1.55). Therefore, by increasing the content of quartz in the green body, the transparency of the porcelain green body will be significantly improved.

[0055] The second fundamental reason for the devitrification of traditional ceramic green bodies is the porosity. A low porosity is a key factor for enhancing transparency.

[0056] There are mainly the following four ways to achieve light transmission in traditional ceramic green bodies: 1. High-white potassium-based green bodies; 2. High-quartz light-transmitting ceramic green bodies; 3. Bone china introduced with calcium phosphate and bone ash; 4. Introducing CaO to form anorthite crystals with a refractive index difference from quartz less than 0.1. Taking the formulations of many light-transmitting ceramic tile green bodies in the current ceramic tile industry as an example, as shown in Table 1.

[0057] Table 1

[0058]

[0059]

[0060] Since the light transmittance of light-transmitting ceramic tiles is not very high, the building ceramic tile industry refers to the light-transmitting ceramic tiles as light-transmitting rock slabs, light-transmitting ceramic tiles, light-transmitting jade tiles, jade polished tiles, etc. according to different categories. Currently, most of the disclosed light-transmitting ceramic tile green bodies in the tile industry are mainly calcium-based. Some can be put into production, while some have congenital defects in formula design and are difficult to be put into industrial production.

[0061] In the past ceramic industry, calcium-based green bodies were only used for ceramic wall tiles and rarely for porcelain green bodies. This is because CaO can increase the high-temperature viscosity of the glass phase at low temperatures and significantly reduce the high-temperature viscosity of the glass phase at high temperatures. This "quick melting" and "short" characteristics of CaO restrict its application in porcelain tile green bodies.

[0062] In porcelain green bodies with a relatively high CaO content, since the viscosity of the glass phase containing CaO is prone to be low, the porcelain green body is prone to deformation and even serious defects such as foaming may occur; the firing range of products containing CaO is narrower than that of traditional green bodies, which is also caused by this glass phase containing CaO. This is the main problem of the adverse effects of calcite, including calcium oxide-containing silicates (wollastonite, diopside) on ceramic green bodies.

[0063] To improve the light transmittance, the light-transmitting green body must ensure an extremely low porosity and become a porcelain green body. However, CaO in the porcelain green body is prone to cause deformation and even foaming of the green body. Therefore, the firing temperature range of the calcium-based light-transmitting green body is relatively narrow and the production difficulty is relatively large, which is due to the congenital defect in its formula system design.

[0064] The embodiments of the present application can broaden the firing temperature range of the translucent ceramic green body, solve the problems of ceramic tile deformation and blistering; can meet various specifications of ceramic tiles, that is, according to the requirements of the green body strength of different specification products, the addition amount of kaolin can be adjusted arbitrarily without affecting the light transmittance; can meet different firing temperatures, that is, two kinds of frit, high-temperature and low-temperature, are fired, and the ratio of potassium feldspar to low-temperature frit is adjusted according to the firing temperature, and the light transmittance of the green body is not affected.

[0065] Please refer to Figure 1 , Figure 1 which is a flowchart of the preparation method of the translucent ceramic tile of the strontium-aluminum-silicon system in the present invention. As Figure 1 shown, the preparation method of the translucent ceramic tile of the strontium-aluminum-silicon system described in the embodiments of the present invention includes the following steps:

[0066] Step S100: Select a target raw material formula from a pre-constructed raw material formula table according to the specification of the translucent ceramic tile to be prepared;

[0067] Step S200: Prepare the translucent ceramic tile according to the target raw material formula; wherein, the raw material formula table includes several raw material formulas, and the raw materials in each raw material formula include: kaolin, strontium carbonate, potassium feldspar, low-temperature frit, strontium feldspar and / or quartz, and the weight percentage of kaolin in each raw material formula is different.

[0068] The formula of the translucent ceramic tile in the embodiments of the present application includes three parts. The first part is the strontium feldspar raw material synthesis part, including kaolin and strontium carbonate.

[0069] Specifically, if the green body strength of the ceramic green body is insufficient, defects such as cracks and fractures will occur in the brick blank during the production process, resulting in a decrease in the excellent product rate and an increase in cost. For large-sized products, a high green body strength is required; for small-sized products, a low green body strength is required. According to different products, the green body strength requirements vary from 2 to 6 MPa, and the kaolin dosage in the green body formula varies from 20 to 42 wt%.

[0070] In the ceramic green body, SrO has a wide melting range and does not have rapid fusibility. After kaolin is calcined, it is easy to form mullite with a relatively high refractive index, resulting in the loss of transparency of the green body. Kaolin is an essential and widely used raw material in the green body, especially in slab products. If kaolin forms strontium feldspar with a refractive index extremely close to that of anorthite with strontium carbonate during the calcination process, and strontium feldspar can form strontium ice feldspar with a refractive index closer to that of quartz with potassium and sodium feldspar at high temperatures, then there is no mullite in the ceramic tile blank, thereby improving the light transmittance of the green body.

[0071] Based on the reaction equation of kaolin with strontium carbonate at high temperatures:

[0072] SrCO3 + Al2O3·2SiO2·2H2O → SrO·Al2O3·2SiO2 + CO2↑ + H2O at temperatures above 900°C;

[0073] As shown in Table 2, the mass ratio of kaolin to strontium carbonate has the following pattern:

[0074] Table 2

[0075]

[0076] In the above formula, adding 20 - 30% of kaolin is suitable for producing products with small specifications such as those below 800*800mm. While about 40% is suitable for the slab blank formula.

[0077] In the embodiments of the present application, the sum of the weight percentages of potassium feldspar and low - temperature frit in each raw material formula is 25 - 35%.

[0078] The second part of the light - transmissive ceramic tile formula in the embodiments of the present application is the body sintering material part. Specifically, during the sintering process of the ceramic body, liquid - phase sintering is the main process and solid - phase sintering is the auxiliary process. During the sintering process, solids, liquids, and pores coexist. During the sintering process, the low - temperature liquid phase fills the pores and solidifies the ceramic into a dense body.

[0079] The strengthening effect of the liquid phase on sintering, in addition to depending on the solubility between the liquid phase and the solid phase, the segregation ability of the liquid phase at the sintering neck, and the high diffusivity of the solid phase in the liquid phase, the liquid phase must also be able to wet the surface of the solid particles. Good wettability will be conducive to the movement of the liquid phase in the pores and filling the pores in the body.

[0080] Sintering materials that can meet the above conditions are potassium feldspar and low - temperature frit. The low - temperature frit has a low surface tension and good solid - phase wettability, and is more likely to fill the pores in the body, making the body dense. Keeping the total amount of potassium feldspar and low - temperature frit unchanged and increasing the amount of low - temperature frit used can reduce the firing temperature. Reducing the amount of low - temperature frit used can increase the firing temperature. The two cooperate to raise or lower the sintering temperature of the body within a certain range.

[0081] According to sintering theory and experiments, the total amount of potassium feldspar and low - temperature frit of 25 - 35 wt% is sufficient.

[0082] The embodiments of the present application can meet different firing temperatures, fire two types of high - temperature and low - temperature frits, and adjust the ratio of potassium feldspar to low - temperature frit according to the firing temperature, and the light transmittance of the body is not affected.

[0083] In one embodiment of the present application, the chemical components of the low - temperature frit, by weight percentage, include:

[0084] SiO2 70 - 72%, Al2O3 1 - 3%, Fe2O3 0 - 0.2%, TiO2 0 - 0.05%, CaO 5 - 10%, MgO 3 - 5%, K2O 0 - 1.5%, Na2O 8 - 16%, and the balance is loss on ignition;

[0085] Alternatively, the chemical components of the low - temperature frit, by weight percentage, include:

[0086] SiO2 50 - 60%, Al2O3 2 - 3%, Fe2O3 0 - 0.2%, TiO2 0 - 0.05%, CaO 0 - 0.5%, MgO 0 - 0.5%, SrO 8 - 12%, K2O 0 - 5%, Na2O 8 - 16%, and the balance is loss on ignition;

[0087] Alternatively, the chemical components of the low - temperature frit, by weight percentage, include:

[0088] SiO2 50 - 60%, Al2O3 2 - 3%, Fe2O3 0 - 0.2%, TiO2 0 - 0.05%, CaO 0 - 0.5%, MgO 0 - 0.5%, SrO 8 - 12%, K2O 0 - 5%, Na2O 8 - 16%, MoO3 0 - 2%, and the balance is loss on ignition.

[0089] Specifically, there are the following schemes for using the low - temperature frit:

[0090] Scheme 1: Use sodium - calcium - silicon glass powder B01. The chemical components of sodium - calcium - silicon glass powder B01, by weight percentage, include:

[0091] SiO2 70 - 72%, Al2O3 1 - 3%, Fe2O3 0 - 0.2%, TiO2 0 - 0.05%, CaO 5 - 10%, MgO 3 - 5%, K2O 0 - 1.5%, Na2O 8 - 16%, and the balance is loss on ignition.

[0092] Scheme 2: Use low - temperature frit K12. The chemical components of low - temperature frit K12, by weight percentage, include:

[0093] SiO2 50 - 60%, Al2O3 2 - 3%, Fe2O3 0 - 0.2%, TiO2 0 - 0.05%, CaO 0 - 0.5%, MgO 0 - 0.5%, SrO 8 - 12%, K2O 0 - 5%, Na2O 8 - 16%, and the balance is loss on ignition.

[0094] Scheme 3: Use low - temperature frit K12B fired with molybdenum trioxide. The chemical components of low - temperature frit K12B, by weight percentage, include:

[0095] SiO2 50 - 60%, Al2O3 2 - 3%, Fe2O3 0 - 0.2%, TiO2 0 - 0.05%, CaO 0 - 0.5%, MgO 0 - 0.5%, SrO 8 - 12%, K2O 0 - 5%, Na2O 8 - 16%, MoO3 0 - 2%, and the balance is loss on ignition.

[0096] The common characteristics of low - temperature frit are low aluminum content and high sodium content. Even adding molybdenum trioxide to the frit makes its surface tension low at high temperature, with good wettability, which is more conducive to promoting liquid - phase sintering of the translucent ceramic tile body. It can melt into the chemical composition of the glass and can significantly reduce the surface tension. Among the four metal oxides of vanadium, chromium, molybdenum, and tungsten, only molybdenum trioxide does not show color. Melting molybdenum oxide into the frit can reduce the surface tension of the frit, making it the best choice for the body sintering material in the formula of the translucent ceramic tile body.

[0097] Among the above - mentioned low - temperature frits, the low - temperature frit K12B containing molybdenum trioxide is preferred first, followed by K12, and finally sodium - calcium - silicon glass powder B01. This is because the glass powders commonly used in the ceramic tile industry are all recycled glass. Although they are cheap, their chemical compositions vary quite a lot with different batches.

[0098] In the embodiment of the present application, the preparation steps of the strontium feldspar include: preparing kaolin, strontium carbonate, and potassium feldspar according to a predetermined raw material formula, and the firing temperature is 1450°C - 1500°C.

[0099] The third part included in the formula of the translucent ceramic tile in the embodiment of the present application is the high - temperature filler part. In the formula where the usage amount of kaolin is less than 25%, the total amount of kaolin and strontium carbonate is 31 - 41%, and the body sintering material is 25 - 35%. The sum of the two is 56 - 76%. Use strontium feldspar (or anorthoclase) or quartz to make up the total to 100%. Potassium - sodium feldspar cannot be used because potassium - sodium feldspar is easy to burn into a glass phase at high temperature. Coupled with the glass phase in the body sintering material, there is too much glass phase in the formula, and there is a low - temperature frit in the body sintering material, which easily causes defects such as bulging and black - heart of the body at high temperature. Using strontium feldspar or quartz that can only be melted at higher temperatures will not have this problem. Moreover, strontium feldspar (or anorthoclase) can form a limited isomorphous mixture with potassium - sodium feldspar at high temperature, reducing the refractive index, which is helpful for light transmission. The refractive index of quartz is also close to the glass phase in the body, resulting in little loss of light transmittance.

[0100] Specifically, the frit formula of strontium feldspar (or anorthoclase) is: 50 parts of kaolin, 30 parts of strontium carbonate, and 0 - 10 parts of potassium feldspar. The frit firing temperature is 1450°C - 1500°C.

[0101] In the embodiment of the present application, the chemical components of the strontium feldspar, by weight percentage, include:

[0102] SiO2 26 - 31%, Al2O3 20 - 21%, Fe2O3 0.15 - 0.25%, TiO2 0 - 0.05%, CaO 0 - 0.2%, MgO 0 - 0.2%, SrO 30 - 35%, K2O 0 - 1.4%, Na2O 0 - 0.5%, and the balance is loss on ignition.

[0103] In the embodiments of the present application, the raw material formula in the raw material formula table is by weight percentage and includes:

[0104] Kaolin 20%, strontium carbonate 11 - 13%, potassium feldspar + low - temperature frit 25 - 35%, strontium feldspar and / or quartz 32 - 44%;

[0105] Kaolin 25%, strontium carbonate 14 - 16%, potassium feldspar + low - temperature frit 25 - 35%, strontium feldspar and / or quartz 24 - 36%;

[0106] Kaolin 30%, strontium carbonate 17 - 19%, potassium feldspar + low - temperature frit 25 - 35%, strontium feldspar and / or quartz 16 - 28%;

[0107] Kaolin 35%, strontium carbonate 20 - 22%, potassium feldspar + low - temperature frit 25 - 35%, strontium feldspar and / or quartz 8 - 20%;

[0108] Kaolin 40%, strontium carbonate 23 - 25%, potassium feldspar + low - temperature frit 25 - 35%, strontium feldspar and / or quartz 0 - 12%;

[0109] Kaolin 45%, strontium carbonate 26 - 28%, potassium feldspar + low - temperature frit 20 - 30%, strontium feldspar and / or quartz 0 - 9%.

[0110] The raw material formula table is shown in Table 3:

[0111] Table 3

[0112]

[0113]

[0114] In the above formula, even for large - sized rock slabs, when kaolin is used at 40 - 42 wt%, and supplemented with a green body strengthening agent, etc., the green body strength is sufficient. Therefore, the combination of 45 wt% kaolin is basically not used.

[0115] In the formula, especially when the contents of Fe2O3 and TiO2 in kaolin decrease, it has little impact on the sense of transparency. However, the color of the green body itself will be yellowish green (the color is shown by iron oxide). In the formula, when the Fe2O3 content in kaolin is less than 0.4%, it barely meets the requirements, and when it is less than 0.2%, it is of high quality. In potassium feldspar, quartz, and frit, the Fe2O3 content should be less than 0.1%. And the content of TiO2 is extremely small. In the formula, kaolin, potassium feldspar, and quartz are all natural minerals, and strontium carbonate is of industrial purity, and their components are not listed.

[0116] In the embodiment of the present application, before the step S100, it further includes: establishing the corresponding relationship between the specification and the weight percentage of kaolin.

[0117] Due to the insufficient green body strength of the ceramic green body, defects such as cracks and fractures will occur in the brick green body during the production process, resulting in a decrease in the first-class rate of production and an increase in costs. For larger product specifications, higher green body strength is required; for smaller product specifications, lower green body strength is required. According to different products, the required green body strength ranges from 2 to 6 MPa, and the amount of kaolin used in the green body formula ranges from 20 to 42 wt%. Therefore, there is a certain corresponding relationship between the specification and the weight percentage of kaolin.

[0118] The embodiment of the present application can meet ceramic tiles of various specifications and improve the scope of application.

[0119] In the embodiment of the present application, the step S100 specifically includes:

[0120] Step S110: Search for the corresponding relationship according to the specification of the light-transmitting ceramic tile to be prepared, and obtain the target weight percentage of kaolin;

[0121] Step S120: Select the target raw material formula corresponding to the target weight percentage of kaolin in the pre-constructed raw material formula table.

[0122] The embodiment of the present application can adjust the addition amount of kaolin according to the requirements of the green body strength of products with different specifications, and the light transmittance is not affected.

[0123] In the embodiment of the present application, the step S200 specifically includes:

[0124] Step S210: Mix the raw materials according to the target raw material formula, add water and additives, and perform wet ball milling;

[0125] Step S220: Screen and remove iron and perform spray drying on the ball-milled raw materials to obtain powder;

[0126] Step S230: Press the powder into a green body, dry the green body, and spray water on the surface of the dried green body;

[0127] Step S240: Apply the base glaze and surface glaze to the body after spraying water, and fire the glazed body in a kiln at a ring temperature of 1130°C to 1200°C to obtain a translucent ceramic tile;

[0128] Among them, the ring temperature is inversely proportional to the addition amount of the low-temperature frit.

[0129] Specifically, mix the raw materials of each part of the body together, add water and additives for wet ball milling; during ball milling, the finer the fineness, the better the transparency, and the wider the firing range. The laser particle size analysis of the fineness of the blank in the present invention is as Figure 2 shown. Screen and remove iron from the ball-milled raw materials, and perform spray drying treatment to obtain powder; send the uniformly mixed powder into a press to press into a body; spray water slurry on the surface of the ceramic tile blank after drying the body; apply the base glaze and surface glaze to the tile blank after spraying water; the tile blank can be fired in a roller kiln, and a ceramic tile firing kiln with a ring temperature of 1130°C to 1200°C can be adapted. The adaptation method is to adjust the ratio of potassium feldspar to low-temperature frit in the body sintering material. When the ring temperature rises, the frit ratio increases; when the ring temperature drops, the frit ratio increases. That is, keeping the total amount of potassium feldspar and low-temperature frit unchanged, increasing the use amount of low-temperature frit can lower the firing temperature; reducing the use amount of low-temperature frit can raise the firing temperature. The two cooperate to raise and lower the body sintering temperature within a certain range, and at the same time, the light transmittance of the body is not affected.

[0130] In a specific embodiment, mix the raw materials in proportion. By mass ratio, each component is: 35wt% kaolin, 21wt% strontium carbonate, 10% strontium feldspar, 5wt% quartz, 17wt% potassium feldspar, 12wt% glass powder, and add 0.2% sodium carboxymethylcellulose and 0.8% sodium tripolyphosphate. Wet ball mill the raw materials, and control the fineness to a particle size D50 ≤ 3μm; screen and remove iron from the ball-milled slurry, and spray dry the slurry to obtain powder; send the powder into a press for molding, and dry the formed dry blank in a 150°C drying kiln, and then perform inkjet printing; the printed blank enters the glaze line, apply the base glaze and surface glaze on it, and then enter the kiln for firing. The ring temperature is 1145°C and the firing cycle is 42min. The light transmission effect after firing is as Figure 3 shown. The water absorption rate of the product after firing is detected to be less than 0.1%, meeting the requirements of Appendix G of GBT 4100-2015 ceramic tiles.

[0131] The embodiment of the present application broadens the firing range of the translucent ceramic tile body, reducing the possibility of tile deformation at high temperatures; it does not bulge or foam during overfiring at high temperatures, and has good light transmittance, as Figure 3 shown.

[0132] The embodiment of the present application also provides a translucent ceramic tile, which is prepared by the preparation method of the translucent ceramic tile of the strontium-aluminum-silicon system as described above.

[0133] The present invention provides a method for preparing a light-transmitting ceramic tile of a strontium-aluminum-silicon system and the light-transmitting ceramic tile. The method for preparing the light-transmitting ceramic tile of the strontium-aluminum-silicon system includes: selecting a target raw material formula from a pre-constructed raw material formula table according to the specifications of the light-transmitting ceramic tile to be prepared; preparing the light-transmitting ceramic tile according to the target raw material formula; wherein, the raw material formula table includes a number of raw material formulas, and the raw materials in each raw material formula include: kaolin, strontium carbonate, potassium feldspar, low-temperature frit, strontium feldspar and / or quartz, and the weight percentages of kaolin in each raw material formula are different. In the present invention, during the calcination process, kaolin forms strontium feldspar with a refractive index extremely close to that of anorthite with strontium carbonate, and strontium feldspar can form strontium ice feldspar with a refractive index closer to that of quartz with potassium-sodium feldspar at high temperatures. In this way, mullite no longer exists in the ceramic tile blank, thereby improving the light transmittance of the blank.

[0134] It should be understood that the application of the present invention is not limited to the above examples. For those of ordinary skill in the art, improvements or transformations can be made according to the above description, and all such improvements and transformations should fall within the protection scope of the appended claims of the present invention.

Claims

1. A method for preparing a strontium aluminum silicon system light-transmitting ceramic tile, characterized in that: The method comprises: Mix the raw materials according to the target raw material formula, add water and additives to perform wet ball milling; The ball-milled raw material is sieved to remove iron and spray-dried to obtain a powder; Pressing the powder into a green body, drying the green body, and spraying water on the surface of the dried green body; Applying base glaze and top glaze to the green body after water spraying, and firing the glazed green body in a kiln at an ambient temperature of 1130°C to 1200°C to obtain a light-transmitting ceramic tile; The target raw material formula is composed of the following raw materials by weight percentage: Kaolin 20%, strontium carbonate 11-13%, potassium feldspar + low-temperature frit 25-35%, strontium feldspar and / or quartz 32-44%; or Kaolin 25%, strontium carbonate 14-16%, potassium feldspar + low-temperature frit 25-35%, strontium feldspar and / or quartz 24-36%; or Kaolin 30%, strontium carbonate 17-19%, potassium feldspar + low-temperature frit 25-35%, strontium feldspar and / or quartz 16-28%; or Kaolin 35%, strontium carbonate 20-22%, potassium feldspar + low-temperature frit 25-35%, strontium feldspar and / or quartz 8-20%; or Kaolin 40%, strontium carbonate 23-25%, potassium feldspar + low-temperature frit 25-35%, strontium feldspar and / or quartz 0-12%; Among them, the ring temperature is inversely proportional to the amount of low-temperature frit added; The preparation steps of the strontium feldspar include: The kaolin, strontium carbonate and potassium feldspar are prepared according to a predetermined raw material formula, and the calcination temperature is 1450°C to 1500°C; The chemical components of the strontium feldspar include, by weight percentage: SiO2: 26~31%, Al2O3: 20~21%, Fe2O3: 0.15~0.25%, TiO2: 0~0.05%, CaO: 0~0.2%, MgO: 0~0.2%, SrO: 30~35%, K2O: 0~1.4%, Na2O: 0~0.5%, and the rest is loss on ignition; The chemical components of the low temperature frit include, by weight percentage: SiO2: 70~72%, Al2O3: 1~3%, Fe2O3: 0~0.2%, TiO2: 0~0.05%, CaO: 5~10%, MgO: 3~5%, K2O: 0~1.5%, Na2O: 8~16%, and the rest is loss on ignition; Alternatively, the chemical components of the low-temperature frit include, by weight percentage: SiO2: 50~60%, Al2O3: 2~3%, Fe2O3: 0~0.2%, TiO2: 0~0.05%, CaO: 0~0.5%, MgO: 0~0.5%, SrO: 8~12%, K2O: 0~5%, Na2O: 8~16%, and the rest is loss on ignition; Alternatively, the chemical components of the low-temperature frit include, by weight percentage: SiO2: 50~60%, Al2O3: 2~3%, Fe2O3: 0~0.2%, TiO2: 0~0.05%, CaO: 0~0.5%, MgO: 0~0.5%, SrO: 8~12%, K2O: 0~5%, Na2O: 8~16%, MoO3: 0~2%, and the rest is loss on ignition.

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