A process for recycling degraded billets

Abstract

The present invention relates to the field of building materials, and specifically discloses a process for recycling downgraded blanks. The process comprises the following steps: S1, polishing the surface of a tile, removing the frit, pattern and base glaze on the surface of the tile, and obtaining a downgraded blank; S2, applying base glaze on the surface of the downgraded blank; S3, applying zirconium white medium and firing; S4, applying top glaze and firing; S5, sequentially inkjet-jetting the top glaze and printing a glitter material; S6, applying a frit layer on the glitter material and firing; S7, vacuum plating the surface of the fired product; S8, obtaining the final product after polishing, edge grinding, grading and packaging. The final product is formed by glazing unqualified products, re-glazing them, and firing them, without the need to crush the unqualified products. After each firing, the cooling temperature is increased, and the product is slowly cooled to avoid the product from cracking. The downgraded blank recycling process of the present application improves the quality of the final product and the recycling efficiency of tile waste.

Description

Technical Field

[0001] The present invention relates to the field of building materials, and in particular to a process for recycling degraded billets. Background Art

[0002] At present, the production process of glazed tiles requires the following steps: firing the body - glazing the body surface - firing. As the requirements for the beauty and quality of tile patterns become higher and higher, after the body is fired, it is usually necessary to apply multiple layers of glaze and fire it multiple times. The tiles on the surface of the tiles may become unqualified.

[0003] In the related art, unqualified tiles are usually crushed and added to the raw materials for producing green bodies in a small proportion. The tile crushed materials contain a large amount of glaze components, among which there are usually colored raw materials and glittering raw materials. A large amount of added materials will affect the quality of the green body. Moreover, if the amount of tile crushed materials added is small, the consumption rate is slow, which affects the recycling efficiency of tile waste.

[0004] The technical problem to be solved by this application is: how to improve the recycling efficiency of tile waste. Summary of the Invention

[0005] In order to overcome the deficiencies of the prior art, the present invention aims to provide a process for recycling degraded billets.

[0006] The technical solution adopted in the present invention is:

[0007] A process for recycling degraded billets, characterized by comprising the following steps:

[0008] S1. Polishing the surface of the tile to remove the frit, pattern and bottom glaze on the surface of the tile to obtain a degraded blank;

[0009] S2. applying a base glaze on the surface of the degraded blank;

[0010] S3, applying zirconium white medium and firing;

[0011] S4, applying glaze and firing;

[0012] S5, sequentially inkjet and print glitter material on the glaze;

[0013] S6. applying a frit layer on the flash material and firing;

[0014] S7. Perform vacuum plating on the surface of the fired product;

[0015] S8. After polishing, edge grinding, grading and packaging, the final product is obtained.

[0016] By glazing unqualified products and then re-glazing and firing them to form the final product, there is no need to crush the unqualified products. The surface is leveled during glazing according to the performance of the downgraded blank to reduce the occurrence of warping of the product. After each firing is completed, the cooling temperature is increased and the product is slowly cooled to avoid the product from cracking. The downgraded blank recycling process of this application improves the quality of the final product and improves the recycling efficiency of tile waste.

[0017] In some embodiments, the flash material is composed of the following ingredients: Al2O3 31.2%, MgO 5.1%, K2O 13.2%, Na2O 2.1%, and the balance is SiO2.

[0018] In some embodiments, in step S6, a scraper is used to flatten the frit on the surface of the degraded billet.

[0019] After the glaze layer on the surface of the body is polished off, the surrounding areas of the body are prone to warping. Before applying the frit and firing, scraping the degraded body surface with a scraper can improve the levelness of the body surface and further improve the quality of the body.

[0020] In some embodiments, in step S6, the firing temperature is 890° C.-930° C., and the firing time is 50-60 minutes.

[0021] In some embodiments, the zirconium white medium is composed of the following components: zirconium silicate 53-58%, Al2O3 13-18%, Fe2O3 <0.1%, CaO2-4.5%, MgO 0.3-1.5%, TiO2 <0.05%, B2O3 16-19%, ZnO 1-2%, BaO 3-5% and Li2O <0.05%.

[0022] Zirconium white medium can restore the whiteness of the degraded blank, reduce the impact of the degraded blank on the final pattern display of the product, and further improve the quality of the final product.

[0023] In some embodiments, the frit layer consists of the following components: Al2O3 13-18%, SiO2 53-58%, Fe2O3 <0.1%, CaO2-4.5%, MgO0.3-1.5%, TiO2 <0.05%, B2O3 16-19%, ZnO 1-2%, BaO3-5% and Li2O <0.05%.

[0024] In some embodiments, after step S6, the following step is further included: S61, drying in a drying oven at 300-400°C for 20-60 minutes.

[0025] The downgraded blank has been fired at least three times during the production process, and the blank is relatively brittle. After polishing and re-firing, the slow cooling temperature is increased accordingly and the slow cooling time is extended. The surface of the cooled product is then vacuum-plated with gold or silver, which can reduce the brittle fracture of the downgraded blank during reuse.

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

[0027] By glazing unqualified products and then re-glazing and firing them to form the final product, there is no need to crush the unqualified products. The surface is leveled during glazing according to the performance of the downgraded blank to reduce the occurrence of warping of the product. After each firing is completed, the cooling temperature is increased and the product is slowly cooled to avoid the product from cracking. The downgraded blank recycling process of this application improves the quality of the final product and improves the recycling efficiency of tile waste. DETAILED DESCRIPTION

[0028] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the appended tables in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0029] Example 1

[0030] A process for recycling degraded billets is prepared by the following method:

[0031] S1. Polishing the surface of the tile, removing the frit, pattern and bottom glaze on the surface of the tile to obtain a degraded blank;

[0032] S2, applying a base glaze on the surface of the degraded blank and firing at 900°C for 50 minutes;

[0033] S3. Apply zirconium white medium to the base glaze surface and fire at 890℃ for 45 minutes. The zirconium white medium consists of the following ingredients: zirconium silicate 53-58%, Al2O313-18%, Fe2O3<0.1%, CaO2-4.5%, MgO0.3-1.5%, TiO2<0.05%, B2O316-19%, ZnO1-2%, BaO3-5% and Li2O<0.05%;

[0034] S4, applying a glaze to the surface of the zirconium white medium and firing at 900°C for 40 minutes;

[0035] S5, inkjet and print glitter material on the opposite glaze;

[0036] S6. Apply a frit layer on the flash material and fire it at 910°C for 50 minutes, and use a scraper to smooth the frit on the surface of the degraded blank. The flash material consists of the following components: Al2O331.2%, MgO5.1%, K2O13.2%, Na2O2.1%, and the balance is SiO2. The frit layer consists of the following components: Al2O313-18%, SiO253-58%, Fe2O3<0.1%, CaO2-4.5%, MgO0.3-1.5%, TiO2<0.05%, B2O316-19%, ZnO1-2%, BaO3-5% and Li2O<0.05%;

[0037] S61, drying in a drying oven at 350°C for 30 minutes;

[0038] S7. Vacuum electroplating the surface of the fired product in a gold plating furnace;

[0039] S8. After polishing, edge grinding, grading and packaging, the final product is obtained.

[0040] Comparative Example 1

[0041] A process for recycling degraded billets is different from that of Example 1 in that after step S6 is completed, step S7 is directly performed.

[0042] Comparative Example 2

[0043] A process for recycling degraded blanks, which differs from Example 1 in that step S6 comprises: applying a frit layer on a flash material and firing the flash material at 910° C. for 50 minutes, wherein the flash material comprises the following components: Al2O3 31.2%, MgO 5.1%, K2O 13.2%, Na2O 2.1%, and the balance is SiO2; and the frit layer comprises the following components: Al2O3 13-18%, SiO2 53-58%, Fe2O3 <0.1%, CaO2 4.5%, MgO 0.3-1.5%, TiO2 <0.05%, B2O3 16-19%, ZnO 1-2%, BaO 3-5%, and Li2O <0.05%.

[0044] Comparative Example 3

[0045] A process for recycling degraded billets is different from that of Example 1 in that the firing temperature in step S2 is 1000° C. and the firing time is 40 minutes.

[0046] Comparative Example 4

[0047] A process for recycling degraded billets is different from that of Example 1 in that the firing temperature in step S3 is 1000° C. and the firing time is 30 minutes.

[0048] Comparative Example 5

[0049] A process for recycling degraded billets is different from that of Example 1 in that the firing temperature in step S6 is 1000° C. and the firing time is 40 minutes.

[0050] Comparative Example 6

[0051] A process for recycling degraded blanks is different from that of Example 1 in that the drying temperature in step S61 is 100°C.

[0052] Comparative Example 7

[0053] A process for recycling degraded billets is different from that of Example 1 in that the drying time in step S61 is 100 minutes.

[0054] Comparative Example 8

[0055] A process for recycling degraded billets is different from that of embodiment 1 in that, in step S6, the thickness of the frit on the surface of the degraded billets is equal.

[0056] Comparative Example 9

[0057] A process for recycling degraded billets is different from that of Example 1 in that, in step S6, the thickness of the frit at the corners of the surface of the degraded billet is greater than the thickness of the frit at the center.

[0058] The remaining steps of Comparative Examples 1-9 are consistent with those of Example 1.

[0059] The surface properties and physical properties (such as surface smoothness and product quality) of the products obtained in the above examples and comparative examples are shown in Table 1.

[0060] Table 1 Surface properties and physical properties of products

[0061]

[0062] The experimental results show that the surface of the tiles produced by this application is level, crack-free and of good quality, avoiding the influence of the surface glaze on the quality of the green body after the unsuitable green body is crushed. The downgraded green body recycling process of this application improves the final quality of the recycled products and improves the recycling efficiency of ceramic tile waste.

[0063] In addition, when applying the frit on the surface of the blank, the frit needs to be scraped flat to reduce curling or unevenness on the product surface; after the frit layer is fired, the product is slowly dried at 350°C for 30 minutes. When the drying temperature is too low or the drying time is too long, the surface of the product and the blank are prone to cracking, affecting the normal use of the product.

[0064] Finally, it should be noted that the above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art will be able to modify the technical solutions described in the aforementioned embodiments or substitute equivalents for some of the technical features. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A process for recycling degraded billets, characterized in that: The steps include: S1. Polishing the surface of the tile to remove the frit, pattern and bottom glaze on the surface of the tile to obtain a degraded blank; S2, applying a base glaze to the surface of the degraded body and firing at 900°C for 50 minutes; S3, applying zirconium white medium and firing, and firing at 890°C for 45 minutes; S4, applying glaze and firing; S5, sequentially inkjet and print glitter material on the glaze; S6. Applying a frit layer on the flash material and firing it, wherein the firing temperature is 890° C.-930° C., the firing time is 50-60 minutes, and the frit on the surface of the degraded blank is scraped flat with a scraper before firing. After firing, the degraded blank is dried in a drying furnace at 300-400° C. for 20-60 minutes; S7. Vacuum plating is performed on the surface of the fired product; S8. After polishing, edge grinding, grading and packaging, the final product is obtained.

2. The process for recycling degraded billets according to claim 1, characterized in that: In step S5, the flash material is composed of the following components: Al2O3 31.2%, MgO 5.1%, K2O 13.2%, Na2O 2.1%, and the balance is SiO2.

3. The process for recycling degraded billets according to claim 1, characterized in that: The zirconium white medium is composed of the following components: 53-58% zirconium silicate, 13-18% Al2O3, <0.1% Fe2O3, 2-4.5% CaO, 0.3-1.5% MgO, <0.05% TiO2, 16-19% B2O3, 1-2% ZnO, 3-5% BaO and <0.05% Li2O.

4. The process for recycling degraded billets according to claim 1, characterized in that: The frit layer is composed of the following components: Al2O3 13-18%, SiO2 53-58%, Fe2O3 <0.1%, CaO2-4.5%, MgO 0.3-1.5%, TiO2 <0.05%, B2O3 16-19%, ZnO 1-2%, BaO3-5% and Li2O <0.05%.

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