Low-zirconium ultra-white ceramic face glaze, glaze-finished brick and preparation method thereof

Abstract

The application belongs to the field of building ceramics, and discloses a low-zirconium super-white ceramic glaze, a glaze-finished brick and a preparation method thereof. The raw material components of the ceramic glaze include a base glaze and a zircon white clinker, and the chemical composition of the zircon white clinker includes, in percentage by weight, SiO2 60-68%, Al2O3 10-15%, CaO 3-5%, MgO 0.5-2%, K2O 4-6%, Na2O 6-12%, P2O5 1-2.5%, ZrO2 6-8%, CeO2 0.5-3% and CaF2 0.5-1.5%. The application optimizes each raw material and reasonably compiles them to prepare a low-glaze whitening ceramic glaze with excellent comprehensive performance. When the low-glaze whitening ceramic glaze is applied to the glaze-finished brick, the whiteness can reach up to 79°, the glaze has good color development effect, and the glaze surface is good in quality.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of building ceramics, and particularly relates to a low-zirconium super-white ceramic face glaze, a glaze-finished brick and a preparation method thereof. BACKGROUND

[0002] When producing porcelain glazed tile products, the whiteness of the face glaze is an important reference index, which directly affects the effect and aesthetic degree of the finished product. The face glaze with high whiteness and good color development is conducive to ceramic manufacturers to design more rich textures and patterns in the preparation process, and to produce higher quality products. At present, when producing glazed tile products, zirconium silicate is generally added to the face glaze, and the addition amount is 8-18wt%. When zirconium silicate is added to the ceramic face glaze, it forms zircon in the firing process of the tile, thereby scattering the incident light waves to achieve the effect of opalescence and whitening.

[0003] At present, glazed tiles generally improve whiteness by adding zirconium silicate. When the addition amount of zirconium silicate is relatively low, it can significantly improve the whiteness of the glaze. When the addition amount exceeds 15%, the whiteness improves slowly. At the same time, excessive addition of zirconium silicate also brings other problems, such as the current market price of zirconium silicate is relatively expensive compared with common raw materials for glaze, the cost rises sharply due to the large addition amount, the whiteness improvement is not obvious, and the cost performance is reduced. At the same time, although zirconium silicate itself does not have radioactivity, it often contains a small amount of radioactive elements such as uranium, radium, potassium-40 and thorium. When the addition amount is large, it is easy to cause the radioactivity of the finished product tile to exceed the standard.

[0004] For example, the Chinese invention patent with the publication number CN115521070A discloses a nano super-white face glaze, a ceramic tile and a preparation method thereof. The invention uses zirconium oxychloride aqueous solution, sodium metasilicate aqueous solution and alkaline solution as main raw materials, and prepares nano super-white zirconium silicate with a particle size of ≤50nm by a microemulsion method. The nano super-white zirconium silicate is added to the face glaze to adjust the composition of the face glaze formula, introduces lithium-containing raw materials (porcelain stone) and flaky alumina (α) which are helpful to crystallization, reduces the addition amount of zircon sand in the face glaze, and improves the whiteness and color development effect of the glaze surface. However, the preparation method is complex, and it is difficult to mass-produce to meet the production requirements of ceramic factories.

[0005] The invention discloses a zirconium white frit, a white base glaze and a preparation method and application thereof. The zirconium white frit is prepared from the following chemical components: SiO2 41-45%, SnO2 4-6%, Al2O3 5-7%, Fe2O3 0.01-0.05%, TiO2 0.01-0.05%, CaO 5.5-8%, MgO 2.5-4%, K2O 2-4%, Na2O 0.5-1.5%, ZnO 9-14%, P2O5 1-2%, ZrO2 9-12% and IL 6-9%. The prepared frit 30-40% is compounded with calcined kaolin, wollastonite and sanidine, so that the prepared white base glaze has good flatness, and the whiteness of the base glaze can reach more than 70°. The zirconium white frit simultaneously introduces high content of expensive tin oxide, zirconium oxide and zinc oxide, greatly improves the production cost, and has poor color development effect.

[0006] The invention discloses a high-boron phase separation zirconium white frit and a preparation method thereof. The high-boron phase separation zirconium white frit is prepared from the following raw materials: potassium feldspar 28-32%, boric acid 8-11%, potassium carbonate 2-3%, dolomite 13-15%, heavy calcium 3-5%, zircon 5-6%, zinc oxide 9-10%, and quartz 20-23%. Although the amount of zircon is reduced, the high-boron frit is not suitable for use in ceramic tiles, which can easily lead to low glaze temperature and initial melting point, thereby causing pinholes and overfiring on the glaze surface.

[0007] Therefore, it is urgent to develop a low-zircon white ceramic face glaze, which can ensure the quality of the glaze surface, realize low cost and high whiteness, and will not affect the color development effect of the product. SUMMARY

[0008] The invention provides a low-zircon super-white (whiteness greater than 75°) ceramic face glaze, a glaze-brushed tile and a preparation method thereof, so as to solve one or more technical problems in the prior art and at least provide a beneficial choice or create conditions.

[0009] To solve the above technical problems, the first aspect of the invention provides a ceramic face glaze, which comprises a base glaze and a zirconium white frit. The chemical composition of the zirconium white frit comprises: SiO2 60-68%, Al2O3 10-15%, CaO 3-5%, MgO 0.5-2%, K2O 4-6%, Na2O 6-12%, P2O5 1-2.5%, ZrO2 6-8%, CeO2 0.5-3% and CaF2 0.5-1.5% by weight percentage.

[0010] Specifically, the present application adopts semi-frit ceramic face glaze compounded by raw material and frit, by introducing a certain amount of P2O5, CeO2 and CaF2 in zirconium white frit, and increasing the content of alumina, to prepare low-zirconium ceramic face glaze, which realizes high whiteness and good color development effect under the premise of ensuring the quality of glaze surface. Among them: P2O5 has small surface energy, which can reduce the formation free enthalpy of phase separation droplets in the glaze melt, thereby promoting the nucleation and growth of phase separation droplets. When the size of the phase separation droplets is smaller than or close to the wavelength of visible light, Rayleigh scattering or diffraction of visible light can be generated, thereby improving the opalescent effect of the glaze surface. At the same time, the glaze melt contains some refractory Ca 2+ and Mg 2+ groups, which act as crystal nuclei, and the droplets generated by phase separation provide an interface for the crystallization of the glaze melt, reducing the nucleation barrier and making the glaze melt have a certain crystallization tendency, which is beneficial to promote the precipitation of calcium feldspar and magnesium aluminate spinel crystals, further improving the opalescent effect of the glaze surface. CeO2 can oxidize Fe 2+ to Fe 3+ at high temperature, and the coloring ability of Fe 3+ is only 1 / 10 of that of Fe 2+ , thereby achieving the effects of decolorization and whitening; at the same time, CeO2 can interact with CaF2 to form cerium oxyfluoride, further improving the whiteness of the glaze.

[0011] As a further improvement of the above scheme, the raw material components of the base glaze, by weight, include: 10-20 parts of potassium feldspar, 2-8 parts of nepheline, 25-35 parts of quartz, 1-5 parts of calcined alumina, 10-15 parts of alumina, 2-8 parts of calcined kaolin, 6-10 parts of kaolin, and 3-5 parts of calcined zinc oxide.

[0012] Specifically, the base glaze of the present application contains a certain amount of quartz, potassium feldspar, nepheline and calcined zinc oxide, wherein: quartz sand can be partially dissolved in the glaze melt at high temperature, increasing the viscosity of the melt, which is beneficial to control the excessive growth of crystals and prevent the loss of transparency of the glaze layer; and the undissolved quartz is beneficial to improve the light transmittance of the glaze layer and promote color development. Potassium feldspar and nepheline as flux raw materials not only have good effect on improving the light transmittance of the glaze, but also are beneficial to improve the color development effect of the glaze. Calcined zinc oxide is zinc oxide calcined at a high temperature of 1250-1280 DEG C, which has the effect of improving the glaze property of the glaze and improving the color development performance.

[0013] Meanwhile, the zircon white frit is introduced into the face glaze, which improves the whiteness, but the frit is early melted at high temperature, which makes it difficult to remove the gas in the body, especially under the fast firing condition, thus the pinhole and orange peel defects are easily generated on the glaze surface, which affects the quality of the glaze surface.

[0014] As a further improvement of the above-mentioned scheme, the mass ratio of the base glaze to the zircon white frit is (1.5-5.5):1. By adjusting the use amount of the base raw glaze and the zircon white frit, the whiteness and color development effect of the glaze surface are further improved under the premise of ensuring the quality of the glaze surface.

[0015] As a further improvement of the above-mentioned scheme, the content of Fe2O3 in the alumina is less than 0.1wt%, and the content of Fe2O3 in the kaolin is less than 0.2wt%. The low-iron alumina and kaolin are selected, which can effectively ensure the whiteness of the glaze.

[0016] The second aspect of the present application provides a preparation method of a ceramic face glaze, which comprises the following steps:

[0017] (1) preparing a zircon white frit;

[0018] (2) wet grinding the zircon white frit and the base glaze, and then screening and removing iron to obtain the ceramic face glaze.

[0019] As a further improvement of the above-mentioned scheme, in step (2), grinding aids and water need to be added during the wet grinding.

[0020] Preferably, the grinding aids include sodium carboxymethyl cellulose and sodium tripolyphosphate, and the addition amount is 0.3-0.5wt% of the dry glaze.

[0021] As a further improvement of the above-mentioned scheme, the preparation process of the zircon white frit is as follows:

[0022] The raw materials for preparing the zircon white frit are mixed, and then the mixture is melted and poured into water for quenching to obtain frit particles; then the frit particles are crushed to obtain the zircon white frit.

[0023] As a further improvement of the above-mentioned scheme, the melting temperature is 1500-1580℃, and the melting time is 2-3 hours.

[0024] The third aspect of the present application provides a glazed brick, which comprises a body and a face glaze layer arranged on the upper surface of the body, and the face glaze layer is fired from the above-mentioned ceramic face glaze.

[0025] The fourth aspect of the present application provides a preparation method of the glaze-finished tile, comprising the following steps:

[0026] The raw materials of the surface glaze layer are taken to prepare the surface glaze slurry, which is then applied to the upper surface of the body, and the glaze-finished tile is obtained after drying, firing and polishing.

[0027] As a further improvement of the above-mentioned solution, in step (2), the temperature schedule of the firing is as follows: first, increasing to 900-950℃ at a temperature increasing rate of 12-15℃ / min, and keeping for 10-15min; then, increasing to the highest firing temperature at a temperature increasing rate of 6-8℃ / min, and keeping for 5-10min, and finally, cooling in the kiln; and the highest firing temperature is 1150-1180℃.

[0028] Specifically, when the glaze-finished tile is fired, it is first increased to 900-950℃ at a faster temperature increasing rate, at which time the crystals of calcium feldspar, magnesium-aluminum spinel and mullite begin to nucleate, and the crystals are kept for 10-15min to make them fully nucleate; then, it is increased to 1150-1180℃ at a slower temperature increasing rate, at which time the crystals nucleate and grow, and in order to prevent the crystals from growing too much, the keeping time is controlled to be 5-10min. By controlling the firing schedule, a large amount of microcrystals are precipitated in the glaze layer, which improves the whiteness of the surface while not reducing the color development effect.

[0029] As a further improvement of the above-mentioned solution, the preparation method of the glaze-finished tile comprises the following steps:

[0030] The raw materials of the surface glaze layer and the bottom glaze layer are taken to prepare the surface glaze slurry and the bottom glaze slurry, respectively, which are then applied to the surface of the body layer in sequence, and the glaze-finished tile is obtained after drying, firing and polishing.

[0031] The body and the bottom glaze of the present application have no special requirements, and the body and the bottom glaze of ordinary glaze-finished tiles can be used.

[0032] The above technical solution of the present application has at least the following technical effects or advantages compared with the prior art:

[0033] The present application uses a semi-frit ceramic surface glaze, which fully utilizes the characteristics of each raw material and the interaction between the raw materials by introducing a certain amount of P2O5, CeO2 and CaF2 into the zircon white frit; at the same time, the content of alumina in the formula system is increased, and a certain amount of quartz, potassium feldspar, nepheline and calcined zinc oxide, as well as ceramic basic raw material kaolin, are added, and the raw materials are optimally selected and reasonably compounded to prepare a low-glaze super-white ceramic surface glaze with excellent comprehensive performance. When it is applied to the glaze-finished tile, the whiteness can reach up to 79°, and it has good color development effect and good glaze quality. DETAILED DESCRIPTION

[0034] The present application is described in detail below with reference to examples, so as to facilitate the understanding of the present application by those skilled in the art. It is necessary to point out here that the examples are only used to further illustrate the present application and cannot be understood as limiting the protection scope of the present application. Non-essential improvements and adjustments of the present application made by those skilled in the art according to the above description should still fall within the protection scope of the present application. Meanwhile, the raw materials mentioned below which are not described in detail are all commercially available products; the process steps or preparation methods which are not mentioned in detail are all known to those skilled in the art.

[0035] The raw material composition of the body used in the examples and comparative examples of the present application includes, by weight fraction: potash-soda sand 30 parts, stone powder 20 parts, aluminum sand 8 parts, high-temperature sand 15 parts, talc 2 parts, black mud 8 parts, ball clay 15 parts, and bentonite 2 parts.

[0036] The raw material composition of the base glaze includes, by weight fraction: potash feldspar 50 parts, kaolin 10 parts, calcined kaolin 8 parts, quartz 15 parts, and calcined alumina 17 parts.

[0037] Example 1

[0038] A ceramic face glaze, the raw material composition of which includes, by weight fraction: potash feldspar 15 parts, nepheline 3 parts, quartz 29 parts, calcined alumina 4 parts, alumina 14 parts, calcined kaolin 4 parts, kaolin 8 parts, calcined zinc oxide 3 parts, and zircon white fused block 20 parts; and the content of Fe2O3 in the alumina is less than 0.1 wt%, and the content of Fe2O3 in the kaolin is less than 0.2 wt%.

[0039] The chemical composition of the zircon white fused block includes, by weight percentage: SiO2 60%, Al2O3 11%, CaO 5%, MgO 0.6%, K2O 4%, Na2O 9.4%, P2O5 1%, ZrO2 7%, CeO2 1%, and CaF2 1%.

[0040] A preparation method of a glaze-finished brick, comprising the following steps:

[0041] (1) The raw materials for preparing the zircon white fused block are mixed according to the raw material ratio, and then melted at 1500°C for 2 hours, poured into water for quenching, and crushed to obtain zircon white fused block with a fineness of 100 mesh;

[0042] (2) The zircon white fused block prepared in step (1) is mixed with other raw materials according to the raw material ratio, and then ball-milled (the mass ratio of the material to water, sodium carboxymethyl cellulose and sodium tripolyphosphate is 100:38:0.11:0.35) with the addition of water, sodium carboxymethyl cellulose and sodium tripolyphosphate to obtain a ceramic face glaze with a fineness of 325 mesh and a sieve residue of 0.5 wt%;

[0043] (3) the raw materials of the base glaze layer are mixed according to the proportioning, water, sodium carboxymethyl cellulose and sodium tripolyphosphate are added, and ball milling is carried out (the mass ratio of the material to water, sodium carboxymethyl cellulose and sodium tripolyphosphate is 100:38:0.11:0.35), and a base glaze with a fineness of 325 mesh and a residue of 0.5wt% is obtained;

[0044] (4) the base glaze prepared in step (3) and the ceramic face glaze prepared in step (2) are sequentially applied on the body, and after drying, firing and polishing, the glazed brick of the example is obtained; wherein: the temperature system of the firing is: first, the temperature is raised to 950℃ at a temperature rising rate of 12℃ / min, and the temperature is kept for 10min; then, the temperature is raised to the highest firing temperature at a temperature rising rate of 6℃ / min, and the temperature is kept for 10min, and finally, the kiln is cooled; the highest firing temperature is 1160℃.

[0045] Example 2

[0046] A ceramic face glaze, the raw material components of which include, in parts by weight: potassium feldspar 20 parts, nepheline 5 parts, quartz 25 parts, calcined alumina 3 parts, alumina 10 parts, calcined kaolin 2 parts, kaolin 7 parts, calcined zinc oxide 3 parts, and zircon white fused block 25 parts; and the content of Fe2O3 in the alumina is less than 0.1wt%, and the content of Fe2O3 in the kaolin is less than 0.2wt%.

[0047] The chemical composition of the zircon white fused block includes, in percentage by weight: SiO2 62%, Al2O3 13%, CaO 4%, MgO 1%, K2O 4.5%, Na2O 7%, P2O5 1%, ZrO2 6.5%, CeO2 0.5%, and CaF2 0.5%.

[0048] A preparation method of a glazed brick, comprising the following steps:

[0049] (1) the raw materials for preparing the zircon white fused block are mixed according to the proportioning, the fused block particles are obtained by pouring into water after melting at 1550℃ for 2.5 hours, and the zircon white fused block with a fineness of 100 mesh is obtained by crushing the fused block particles;

[0050] (2) the zircon white fused block prepared in step (1) and other raw materials are mixed according to the proportioning of the raw materials, water, sodium carboxymethyl cellulose and sodium tripolyphosphate are added, and ball milling is carried out (the mass ratio of the material to water, sodium carboxymethyl cellulose and sodium tripolyphosphate is 100:38:0.11:0.35), and a ceramic face glaze with a fineness of 325 mesh and a residue of 0.5wt% is obtained;

[0051] (3) the raw materials of the base glaze layer are mixed according to the proportioning, water, sodium carboxymethyl cellulose and sodium tripolyphosphate are added, and ball milling is carried out (the mass ratio of the material to water, sodium carboxymethyl cellulose and sodium tripolyphosphate is 100:38:0.11:0.35), and a base glaze with a fineness of 325 mesh and a residue of 0.5wt% is obtained;

[0052] (4) on the body, in turn, spray the bottom glaze prepared in step (3) and the ceramic face glaze prepared in step (2), after drying, firing, polishing, the glazed tile of the example is obtained; wherein: the temperature system of firing is: first, with the temperature rising rate of 12 ℃ / min, rise to 920 ℃, keep warm for 12 min; then, with the temperature rising rate of 8 ℃ / min, rise to the highest firing temperature, keep warm for 8 min, finally, out of kiln cooling; the highest firing temperature is 1170 ℃.

[0053] Example 3

[0054] A ceramic face glaze, by weight parts, its raw material components include: potassium feldspar 10 parts, nepheline 2 parts, quartz 25 parts, calcined alumina 2 parts, alumina 10 parts, calcined kaolin 2 parts, kaolin 6 parts, calcined zinc oxide 4 parts, frit 39 parts; and the content of Fe2O3 in alumina is less than 0.1wt%, the content of Fe2O3 in kaolin is less than 0.2wt%.

[0055] Wherein: the chemical composition of zircon white frit includes: SiO2 65%, Al2O3 10%, CaO3.5%, MgO 1.5%, K2O 4%, Na2O 6%, P2O5 2%, ZrO2 6%, CeO2 1%, CaF2 1%, by weight percentage.

[0056] A preparation method of a glazed tile, comprising the following steps:

[0057] (1) according to the raw material ratio, mix the raw materials for preparing zircon white frit, melt at 1550 ℃ for 3 hours, then pour into water for quenching, get frit particles; then crush the frit particles, get zircon white frit with fineness of 100 mesh;

[0058] (2) mix the zircon white frit prepared in step (1) with other raw materials according to the raw material ratio, add water, sodium carboxymethyl cellulose and sodium tripolyphosphate, ball mill (the mass ratio of material, water, sodium carboxymethyl cellulose and sodium tripolyphosphate is 100:38:0.11:0.35), get ceramic face glaze with fineness of 325 mesh residue 0.5wt%;

[0059] (3) mix the raw materials of the bottom glaze layer according to the ratio, add water, sodium carboxymethyl cellulose and sodium tripolyphosphate, ball mill (the mass ratio of material, water, sodium carboxymethyl cellulose and sodium tripolyphosphate is 100:38:0.11:0.35), get bottom glaze with fineness of 325 mesh residue 0.5wt%;

[0060] (4) The body is successively sprayed with the bottom glaze prepared in step (3) and the ceramic face glaze prepared in step (2), and then dried, fired and polished to obtain the glazing brick of the example; wherein the temperature system of the firing is: first raised to 900℃ at a temperature raising rate of 15℃ / min, and kept for 15 min; then raised to the highest firing temperature at a temperature raising rate of 6℃ / min, and kept for 10 min, and finally cooled in the kiln; and the highest firing temperature is 1180℃.

[0061] Example 4

[0062] Example 4 is different from Example 1 only in that the raw material components of the ceramic face glaze of Example 4 do not contain calcined zinc oxide and nepheline, and the types and added amounts of the other raw materials and the preparation method of the glazing brick are the same as those of Example 1.

[0063] Example 5

[0064] Example 5 is different from Example 1 only in that the content of aluminum in the raw material components of the ceramic face glaze of Example 5 is lower, and the preparation method of the glazing brick is the same as that of Example 1.

[0065] The ceramic face glaze of Example 5 contains, by weight, 15 parts of potassium feldspar, 3 parts of nepheline, 29 parts of quartz, 2 parts of calcined alumina, 10 parts of alumina, 4 parts of calcined kaolin, 8 parts of kaolin, 3 parts of calcined zinc oxide and 20 parts of zirconia white fused block.

[0066] Comparative Example 1

[0067] Comparative Example 1 is different from Example 1 only in that the chemical composition of the zirconia white fused block of Comparative Example 1 does not contain phosphorus pentoxide, and the types and added amounts of the other raw materials and the preparation method of the glazing brick are the same as those of Example 1.

[0068] Comparative Example 2

[0069] Comparative Example 2 is different from Example 1 only in that the chemical composition of the zirconia white fused block of Comparative Example 2 does not contain cerium oxide, and the types and added amounts of the other raw materials and the preparation method of the glazing brick are the same as those of Example 1.

[0070] Comparative Example 3

[0071] Comparative Example 3 is different from Example 1 only in that the chemical composition of the zirconia white fused block of Comparative Example 3 does not contain calcium fluoride, and the types and added amounts of the other raw materials and the preparation method of the glazing brick are the same as those of Example 1.

[0072] Comparative Example 4

[0073] The difference between Comparative Example 4 and Example 1 is only that the preparation method of the glaze-finished tile of Comparative Example 4 adopts one-time temperature rising firing, and the specific firing system is as follows: rising to 1160℃ at a temperature rising rate of 12℃ / min, keeping for 30min, and finally taking out of the kiln for cooling.

[0074] Performance detection

[0075] The glaze-finished tile samples prepared in Examples 1-5 and Comparative Examples 1-4 are tested for whiteness, glossiness and color performance, and the glaze quality of the samples is observed, wherein: the whiteness is tested by a digital whiteness meter, the glossiness is tested by a glossiness meter, and the color is tested by a color difference meter, and the color value is determined by L, a and b, wherein "L" represents the brightness of the object: 0-100 represents from black to white; "a" represents the red-green color of the object: positive value represents red, and negative value represents green; "b" represents the yellow-blue color of the object: positive value represents yellow, and negative value represents blue. The test results are shown in Table 1.

[0076] Table 1: Performance comparison table of samples prepared in Examples 1-5 and Comparative Examples 1-4

[0077]

[0078] As shown in Table 1, the glaze-finished tile samples prepared in Examples 1-3 have a glossiness of 3.5-5°, which has a matte gloss; the whiteness can be as high as 79°, which is comparable to the whiteness of zirconium white glaze; in the L, a and b values, the L value is as high as 86.2, which indicates that the surface glaze not only has high whiteness, but also has high brightness, and can better meet the demand of human senses for high brightness and whiteness. The a value is negative, indicating that the glaze surface has a green color, and the b value is positive, indicating that the glaze surface has a yellow color. In the production of glaze-finished tiles, it can better meet the production and product demands.

[0079] In Example 4, the raw material components of the ceramic surface glaze do not contain calcined zinc oxide and nepheline, and the brightness of the surface glaze layer is significantly lower than that of Example 1.

[0080] In Example 5, the aluminum content of the raw material components of the ceramic surface glaze is lower, resulting in a large number of pinholes on the glaze surface, and the whiteness and brightness are also decreased.

[0081] In Comparative Examples 1-3, the zirconium white block does not contain phosphorus pentoxide, cerium oxide or calcium fluoride, and the whiteness and brightness of the product are decreased,

[0082] In Comparative Example 4, the crystal does not fully analyze and there is a crystal growth phenomenon, so the glossiness is increased, and the whiteness and brightness are also lower than those of Example 1.

[0083] Those skilled in the art to which the present application belongs can make several simple deductions or replacements without departing from the concept of the present application, without having to make creative efforts. Therefore, simple improvements made by those skilled in the art to the present application according to the disclosure of the present application should be within the protection scope of the present application. The above embodiments are preferred embodiments of the present application, and any similar processes and equivalent changes made should be within the protection scope of the present application.

Claims

1. A ceramic glaze, characterized in that: The raw material components include, by weight, a basic glaze and a zirconium white frit. The chemical composition of the zirconium white frit is, by weight percentage, as follows: SiO2 60-68%, Al2O3 10-15%, CaO 3-5%, MgO 0.5-2%, K2O 4-6%, Na2O 6-12%, P2O5 1-2.5%, ZrO2 6-8%, CeO2 0.5-3%, and CaF2 0.5-1.5%. The raw material components of the basic glaze include, by weight: 10-20 parts of potassium feldspar, 2-8 parts of nepheline, 25-35 parts of quartz, 1-5 parts of calcined alumina, 10-15 parts of alumina, 2-8 parts of calcined kaolin, 6-10 parts of kaolin, and 3-5 parts of calcined zinc oxide; The mass ratio of the basic glaze to the zirconium white frit is (1.5-5.5):1; The firing temperature system of the ceramic glaze is as follows: first, the temperature is raised to 900-950°C at a heating rate of 12-15°C / min, and kept at this temperature for 10-15 minutes; then, the temperature is raised to the maximum firing temperature at a heating rate of 6-8°C / min, and kept at this temperature for 5-10 minutes, and finally, the glaze is taken out of the kiln and cooled; the maximum firing temperature is 1150-1180°C.

2. The ceramic glaze according to claim 1, characterized in that The content of Fe2O3 in the alumina is less than 0.1 wt%, and the content of Fe2O3 in the kaolin is less than 0.2 wt%.

3. The method for preparing the ceramic glaze according to any one of claims 1 to 2, characterized in that: The following steps are involved: (1) preparing zirconium white frit; (2) Wet-grinding the zirconium white frit and the basic glaze, and then sieving and removing iron to obtain the ceramic glaze.

4. The method for preparing ceramic glaze according to claim 3, characterized in that: The preparation process of the zirconium white frit is as follows: The raw materials for preparing the zirconium white frit are mixed, melted, poured into water and quenched to obtain frit particles; the frit particles are then crushed to obtain the zirconium white frit.

5. The method for preparing ceramic glaze according to claim 4, characterized in that: The melting temperature is 1500-1580° C., and the melting time is 2-3 hours.

6. A glazed tile, characterized in that: The invention comprises a body and a glaze layer provided on the upper surface of the body, wherein the glaze layer is formed by firing the ceramic glaze according to any one of claims 1 to 2.

7. A method for preparing a glazed tile according to claim 6, characterized in that: The following steps are involved: The raw materials of the surface glaze layer are taken to prepare the surface glaze slurry, which is then applied to the upper surface of the green body, and after drying, firing and polishing, the glazed tile is obtained; The firing temperature system is as follows: first, the temperature is raised to 900-950°C at a heating rate of 12-15°C / min, and kept at that temperature for 10-15 minutes; then, the temperature is raised to the maximum firing temperature at a heating rate of 6-8°C / min, and kept at that temperature for 5-10 minutes, and finally, the product is taken out of the kiln and cooled; the maximum firing temperature is 1150-1180°C.

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