Waste porcelain slurry and its application

Abstract

The invention discloses a waste porcelain slurry and its application, which belongs to the technical field of ceramic slurries. The waste porcelain is crushed into waste porcelain particles by roller pressing, and the waste porcelain particles and deionized water ball mill are discharged, dried, and passed through a 500-600 mesh sieve to obtain waste porcelain powder; the waste porcelain powder, coated silicon nitride fiber, mica powder, a dispersant and deionized water are stirred and mixed to obtain a waste porcelain slurry; it is conducive to the reuse of waste porcelain and reduces environmental pollution; the surface of the silicon nitride fiber precursor is attached with tricalcium phosphate powder, and after high-temperature degreasing, a coated silicon nitride fiber is formed, which is conducive to increasing the temperature range of purple sand mud firing and preventing the purple sand mud from cracking during firing. Silicon nitride has good heat resistance, tricalcium phosphate and yttrium oxide help to lower the melting point, thereby increasing the density and strength of the coated silicon nitride fiber, and iron oxide helps to improve its chroma, which helps the waste porcelain slurry to be applied in purple sand mud.

Description

Technical Field

[0001] The invention belongs to the technical field of ceramic slurries, and in particular relates to waste ceramic slurry and application thereof. Background Art

[0002] Ceramics is a general term for pottery and porcelain. Common ceramic materials include clay, alumina, and kaolin. Ceramic materials are generally hard but less malleable. Besides being used in tableware and decoration, ceramics also play a vital role in the development of science and technology. Ceramic raw materials are extracted from clay, a plentiful natural resource. Clay is known for its toughness and plasticity. It can be molded when exposed to water at room temperature, carved when slightly dry, and ground when completely dry. Fired to 700 degrees Celsius, it becomes pottery capable of holding water. Fired to 1230 degrees Celsius, it becomes vitrified, becoming virtually non-absorbent, heat-resistant, and corrosion-resistant.

[0003] Ceramic materials are mostly oxides, nitrides, borides and carbides. Waste porcelain is inevitably produced during the preparation process. The composition of these waste porcelains generally fluctuates greatly and is difficult to reuse. They are generally treated by open-air stacking and shallow landfill.

[0004] Zisha teapots are uniquely Chinese handmade clay crafts, made from purple clay. There are three types of purple clay: purple clay, green clay, and red clay. The clay suitable for making purple clay teapots is often buried deep beneath rock layers, with thicknesses ranging from tens of centimeters to one meter. Petrographic analysis by the Shanghai Institute of Silicates indicates that purple clay is of the kaolin-quartz-mica type, with a high iron content, reaching a maximum of 8.83%. Zisha teapots are fired under high oxygen and high temperatures, typically using a flat flame at temperatures between 1100-1200°C. The finished teapot has a water absorption rate exceeding 2%.

[0005] Purple clay is fired in an oxidizing atmosphere, generally at a temperature of 1100°C. The firing temperature range is relatively narrow. Too high a firing temperature will cause cracking and lose the original properties of purple clay. Currently, there are few applications of using waste porcelain slurry in the firing of purple clay utensils. Summary of the Invention

[0006] The purpose of the present invention is to provide a waste porcelain slurry and application thereof to solve the problems in the background technology.

[0007] The purpose of the present invention can be achieved through the following technical solutions:

[0008] A waste porcelain slurry is prepared by the following steps:

[0009] Step 1: Roll-pressing the waste porcelain into waste porcelain particles, adding the waste porcelain particles, deionized water, and alumina grinding balls into a ball mill at a mass ratio of 1:1.5-2:1, ball-milling at 180-200 r / min for 10-12 hours, filtering the material, drying at 80-100° C., and filtering through a 500-600 mesh sieve to obtain waste porcelain powder;

[0010] Step 2: Add silicon nitride, iron oxide, yttrium oxide, anhydrous ethanol and zirconium oxide grinding balls into a ball mill in a mass ratio of 18:1:1:40-50:20, ball mill at 200-300 r / min for 48 hours, filter the material, vacuum dry it at 60-80°C, and pass it through an 800-1000 sieve to obtain a mixed powder;

[0011] Step 3: Add the mixed powder, polyethylene glycol, polyvinyl butyral and anhydrous ethanol into a stirring tank, stir and mix at 75-80°C and a stirring speed of 1500-2000 r / min for 4-6 hours to obtain a precursor slurry; inject the precursor slurry into the curing agent solution through a spinneret with a diameter of 80-100 μm by wet spinning, filter and vacuum dry to obtain a silicon nitride fiber precursor;

[0012] Step 4: stirring and mixing tricalcium phosphate powder, sodium carboxymethyl cellulose and deionized water, and ultrasonically dispersing them for 20-30 minutes to obtain an impregnation solution; then transferring the silicon nitride fiber precursor to the impregnation solution and immersing it for 15-30 seconds, filtering it and vacuum drying it at 550-580° C. for 20-30 minutes to obtain a coated silicon nitride fiber;

[0013] Step 5: Mixing the waste porcelain powder, coated silicon nitride fiber, mica powder, dispersant and deionized water to obtain a waste porcelain slurry.

[0014] Furthermore, in step 3, the curing agent solution includes boric acid and deionized water, and the usage ratio of boric acid to deionized water is 2.5-3 g:100 mL.

[0015] Furthermore, in step three, the usage ratio of the mixed powder, polyethylene glycol, polyvinyl butyral and anhydrous ethanol is 60-70 g: 15-18 g: 15-18 g: 320-340 g.

[0016] Furthermore, in step 4, the usage ratio of tricalcium phosphate powder, sodium carboxymethyl cellulose and deionized water is 10g:1-2g:80-90g.

[0017] Furthermore, in step five, the usage ratio of waste porcelain powder, coated silicon nitride fiber, mica powder, dispersant and deionized water is 60-65 g: 15-25 g: 5-10 g: 3-5 g: 60-70 mL.

[0018] Furthermore, the dispersant is any one of sodium humate, sodium carboxymethyl cellulose and sodium citrate.

[0019] Another object of the present invention is to provide an application of waste porcelain slurry for preparing purple sand mud.

[0020] Beneficial effects of the present invention:

[0021] The waste porcelain slurry of the present invention uses waste porcelain powder as the main material, which is conducive to the reuse of waste porcelain and reduces environmental pollution. Mica powder plays a role in regulating components such as aluminum oxide, and the dispersant helps to evenly disperse the components. Tricalcium phosphate powder is attached to the surface of the silicon nitride fiber precursor, and after high-temperature degreasing, a coated silicon nitride fiber is formed. The addition of the coated silicon nitride fiber helps the waste porcelain powder to be applied in purple clay. The coated silicon nitride fiber helps to increase the temperature range for firing purple clay and prevents the purple clay from cracking during firing. Silicon nitride has good heat resistance, tricalcium phosphate and yttrium oxide help to lower the melting point, thereby increasing the density and strength of the coated silicon nitride fiber, and iron oxide helps to improve its chroma, making it easy to apply in purple clay. DETAILED DESCRIPTION

[0022] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described 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 any creative efforts shall fall within the scope of protection of the present invention.

[0023] Example 1

[0024] This embodiment provides a waste porcelain slurry, including the following implementation steps:

[0025] Step 1: Roll the waste porcelain and crush it into waste porcelain particles. Add 10 kg of waste porcelain particles, 15 kg of deionized water and 10 kg of alumina grinding balls into a ball mill. After ball milling at 180 r / min for 10 hours, filter the material, dry it at 80°C, and pass it through a 500-mesh sieve to obtain waste porcelain powder.

[0026] Step 2: Add 9 kg of silicon nitride, 0.5 kg of iron oxide, 0.5 kg of yttrium oxide, 20 kg of anhydrous ethanol and 10 kg of zirconium oxide grinding balls into a ball mill, and ball mill at 200 r / min for 48 hours. After filtering the material, vacuum dry it at 60°C and pass it through an 800 sieve to obtain a mixed powder.

[0027] Step 3: Prepare a curing agent solution by adding 2.5 kg of boric acid and 100 L of deionized water; add 6 kg of mixed powder, 1.5 kg of polyethylene glycol, 1.5 kg of polyvinyl butyral and 32 kg of anhydrous ethanol into a stirring tank, where polyethylene glycol acts as a plasticizer and polyvinyl butyral acts as a binder. Stir and mix at 75 ° C and a stirring speed of 1500 r / min for 4 hours to obtain a precursor slurry; the precursor slurry is wet-spun and injected into the curing agent solution through a spinneret with a diameter of 80 μm. Polyethylene glycol and polyvinyl butyral act as organic components and react with boric acid to form a cross-linked network. After filtering and vacuum drying, a silicon nitride fiber precursor is obtained.

[0028] Step 4: Stir and mix 10 kg of tricalcium phosphate powder, 1 kg of sodium carboxymethyl cellulose and 80 kg of deionized water, and ultrasonically disperse them for 20 minutes to obtain an impregnation solution; then transfer the silicon nitride fiber precursor to the impregnation solution and immerse it for 15 seconds to allow the tricalcium phosphate powder to adhere to the surface of the silicon nitride fiber precursor, filter it and vacuum dry it at 550°C for 20 minutes, and decompose organic matter such as polyethylene glycol at high temperature to obtain micron-sized coated silicon nitride fibers.

[0029] Step 5: 6 kg of waste porcelain powder, 1.5 kg of coated silicon nitride fiber, 0.5 kg of mica powder, 0.3 kg of sodium humate and 6 L of deionized water were stirred and mixed to obtain a waste porcelain slurry.

[0030] Example 2

[0031] This embodiment provides a waste porcelain slurry, including the following implementation steps:

[0032] Step 1: Roll the waste porcelain and crush it into waste porcelain particles. Add 10 kg of waste porcelain particles, 18 kg of deionized water and 10 kg of alumina grinding balls into a ball mill. After ball milling at 190 r / min for 11 hours, filter the material, dry it at 90°C, and pass it through a 550-mesh sieve to obtain waste porcelain powder.

[0033] Step 2: Add 9 kg of silicon nitride, 0.5 kg of iron oxide, 0.5 kg of yttrium oxide, 22 kg of anhydrous ethanol and 10 kg of zirconium oxide grinding balls into a ball mill, and ball mill at 250 r / min for 48 hours. After filtering the material, vacuum dry it at 70°C and pass it through a 900 sieve to obtain a mixed powder.

[0034] Step 3: Prepare a curing agent solution by adding 2.8 kg of boric acid and 100 L of deionized water; add 6.5 kg of mixed powder, 1.6 kg of polyethylene glycol, 1.65 kg of polyvinyl butyral and 33 kg of anhydrous ethanol into a stirring tank, where polyethylene glycol acts as a plasticizer and polyvinyl butyral acts as a binder. Stir and mix at 78 ° C and a stirring speed of 1800 r / min for 5 hours to obtain a precursor slurry; the precursor slurry is wet-spun and injected into the curing agent solution through a spinneret with a diameter of 90 μm. Polyethylene glycol and polyvinyl butyral act as organic components and react with boric acid to form a cross-linked network. After filtering and vacuum drying, a silicon nitride fiber precursor is obtained.

[0035] Step 4: Stir and mix 10 kg of tricalcium phosphate powder, 1.5 kg of sodium carboxymethyl cellulose and 85 kg of deionized water, and ultrasonically disperse them for 25 minutes to obtain an impregnation solution; then transfer the silicon nitride fiber precursor to the impregnation solution and immerse it for 20 seconds to allow the tricalcium phosphate powder to adhere to the surface of the silicon nitride fiber precursor, filter it and vacuum dry it at 560°C for 25 minutes, and decompose organic matter such as polyethylene glycol at high temperature to obtain micron-sized coated silicon nitride fibers.

[0036] Step 5: 6.2 kg of waste porcelain powder, 2 kg of coated silicon nitride fiber, 0.8 kg of mica powder, 0.4 kg of sodium carboxymethyl cellulose and 6.5 L of deionized water were stirred and mixed to obtain a waste porcelain slurry.

[0037] Example 3

[0038] This embodiment provides a waste porcelain slurry, including the following implementation steps:

[0039] Step 1: Roll the waste porcelain and crush it into waste porcelain particles. Add 10 kg of waste porcelain particles, 20 kg of deionized water and 10 kg of alumina grinding balls into a ball mill. After ball milling at 200 r / min for 12 hours, filter the material, dry it at 100°C, and pass it through a 600-mesh sieve to obtain waste porcelain powder.

[0040] Step 2: Add 9 kg of silicon nitride, 0.5 kg of iron oxide, 0.5 kg of yttrium oxide, 25 kg of anhydrous ethanol and 10 kg of zirconium oxide grinding balls into a ball mill, and ball mill at 300 r / min for 48 hours. After filtering the material, vacuum dry it at 80°C and pass it through a 1000 sieve to obtain a mixed powder.

[0041] Step 3: Prepare a curing agent solution by adding 3kg of boric acid and 100L of deionized water; add 7kg of mixed powder, 1.8kg of polyethylene glycol, 1.8kg of polyvinyl butyral and 34kg of anhydrous ethanol into a stirring tank, where polyethylene glycol acts as a plasticizer and polyvinyl butyral acts as a binder. Stir and mix at 80°C and a stirring speed of 2000r / min for 6h to obtain a precursor slurry; the precursor slurry is wet-spun and injected into the curing agent solution through a spinneret with a diameter of 100μm. Polyethylene glycol and polyvinyl butyral act as organic components and react with boric acid to form a cross-linked network. After filtering and vacuum drying, a silicon nitride fiber precursor is obtained.

[0042] Step 4: Stir and mix 10 kg of tricalcium phosphate powder, 2 kg of sodium carboxymethyl cellulose and 90 kg of deionized water, and ultrasonically disperse them for 30 minutes to obtain an impregnation solution; then transfer the silicon nitride fiber precursor to the impregnation solution and immerse it for 30 seconds to allow the tricalcium phosphate powder to adhere to the surface of the silicon nitride fiber precursor, filter it and vacuum dry it at 580°C for 30 minutes, and decompose organic matter such as polyethylene glycol at high temperature to obtain micron-sized coated silicon nitride fibers.

[0043] Step 5: 6.5 kg of waste porcelain powder, 2.5 kg of coated silicon nitride fiber, 1 kg of mica powder, 0.5 kg of sodium humate, sodium carboxymethyl cellulose and sodium citrate and 7 L of deionized water were stirred and mixed to obtain a waste porcelain slurry.

[0044] Example 4

[0045] Tianqing mud was selected as the raw material for purple clay. 5 kg of the waste porcelain slurry in Example 1 and 35 kg of Tianqing mud were mixed evenly and then sealed and aged for 6 months. The moisture content was controlled at 25%. Then, a vacuum mud kneading machine was used to press the sample into a size of 5 cm × 10 cm × 30 cm under 170 kPa.

[0046] Example 5

[0047] Tianqing mud was selected as the raw material for purple clay. 5 kg of the waste porcelain slurry in Example 2 and 35 kg of Tianqing mud were mixed evenly and sealed and aged for 6 months. The moisture content was controlled at 25%. Then, a vacuum mud kneading machine was used to press the sample into a size of 5 cm × 10 cm × 30 cm under 170 kPa.

[0048] Example 6

[0049] Tianqing mud was selected as the raw material for purple clay. 5 kg of the waste porcelain slurry in Example 3 and 35 kg of Tianqing mud were mixed evenly and sealed and aged for 6 months. The moisture content was controlled at 25%. Then, a vacuum mud kneading machine was used to press the sample into a size of 5 cm × 10 cm × 30 cm under 170 kPa.

[0050] Comparative Example 1: Based on Example 3, 6.5 kg of waste porcelain powder, 1 kg of mica powder, 0.5 kg of sodium citrate and 7 L of deionized water were directly stirred and mixed to obtain waste porcelain slurry. Tianqing mud was selected as the raw material for purple clay. After 5 kg of waste porcelain slurry and 35 kg of Tianqing mud were evenly mixed, they were sealed and aged for 6 months. The moisture content was controlled at 25%. Then, a vacuum mud kneading machine was used to press them into samples with a specification of 5 cm × 10 cm × 30 cm under 170 kPa.

[0051] Performance tests were conducted on Examples 4 to 6 and Comparative Example 1. Each group of samples was air-dried at 20°C and then transferred to a sintering furnace. The temperature was raised to 1500°C at a heating rate of 5°C / min. The temperature range in which the samples did not crack during firing was observed. The results are shown in Table 1.

[0052] Table 1

[0053] project Example 4 Example 5 Example 6 Comparative Example 1 Temperature range / ℃ 20-1560 20-1580 20-1590 20-1130

[0054] It can be seen from Table 1 that the samples in Examples 5 and 6 have better high temperature resistance, and the application of the waste porcelain slurry in Examples 1 to 3 to purple clay can increase the firing temperature range of purple clay utensils.

[0055] It should be noted that, in this document, terms such as "comprises", "includes" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or apparatus that includes a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements that are inherent to such process, method, article or apparatus.

[0056] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A waste porcelain slurry, characterized in that: Prepared by the following steps: Step 1: Roll-pressing the waste porcelain into waste porcelain particles, grinding the waste porcelain particles, deionized water, and alumina grinding balls in a mass ratio of 1:1.5-2:1, drying, and passing through a 500-600 mesh sieve to obtain waste porcelain powder; Step 2: Stir and mix tricalcium phosphate powder, sodium carboxymethyl cellulose and deionized water, then ultrasonically disperse for 20-30 minutes to obtain an impregnation solution, transfer the silicon nitride fiber precursor into the impregnation solution, immerse for 15-30 seconds, filter, and vacuum dry at 550-580° C. for 20-30 minutes to obtain a coated silicon nitride fiber; Step 3: Mixing the waste porcelain powder, coated silicon nitride fiber, mica powder, dispersant and deionized water to obtain a waste porcelain slurry; The silicon nitride fiber precursor is prepared by the following steps: The mixed powder, polyethylene glycol, polyvinyl butyral and anhydrous ethanol are stirred at 75-80° C. and a stirring speed of 1500-2000 r / min for 4-6 hours to obtain a precursor slurry; the precursor slurry is injected into a curing agent solution through a spinneret with a diameter of 80-100 μm by wet spinning, and the silicon nitride fiber precursor is obtained after filtering and vacuum drying. The preparation method of the mixed powder comprises the following steps: adding silicon nitride, iron oxide, yttrium oxide, anhydrous ethanol and zirconium oxide grinding balls into a ball mill in a mass ratio of 18:1:1:40-50:20, ball milling for 48 hours at 200-300 r / min, filtering the material, vacuum drying the material, and passing it through an 800-1000 sieve to obtain the mixed powder.

2. The waste porcelain slurry according to claim 1, characterized in that: The usage ratio of the mixed powder, polyethylene glycol, polyvinyl butyral and anhydrous ethanol is 60-70g: 15-18g: 15-18g: 320-340g.

3. The waste porcelain slurry according to claim 1, characterized in that: The curing agent solution includes boric acid and deionized water, and the usage ratio of boric acid to deionized water is 2.5-3 g:100 mL.

4. The waste porcelain slurry according to claim 1, characterized in that: The usage ratio of tricalcium phosphate powder, sodium carboxymethyl cellulose and deionized water in step 2 is 10g:1-2g:80-90g.

5. The waste porcelain slurry according to claim 1, characterized in that: The usage ratio of the waste porcelain powder, coated silicon nitride fiber, mica powder, dispersant and deionized water in step 3 is 60-65 g: 15-25 g: 5-10 g: 3-5 g: 60-70 mL.

6. The waste porcelain slurry according to claim 1, characterized in that: The dispersant is any one of sodium humate, sodium carboxymethyl cellulose and sodium citrate.

7. Use of the waste porcelain slurry according to claim 1 in purple sand clay.