CN115028441A - Green and environment-friendly leucite preparation method - Google Patents
Green and environment-friendly leucite preparation method Download PDFInfo
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- 229910052907 leucite Inorganic materials 0.000 title claims abstract description 52
- 238000002360 preparation method Methods 0.000 title claims abstract description 15
- 238000000227 grinding Methods 0.000 claims abstract description 44
- 238000007873 sieving Methods 0.000 claims abstract description 31
- 238000001816 cooling Methods 0.000 claims abstract description 25
- 239000002994 raw material Substances 0.000 claims abstract description 23
- 238000000034 method Methods 0.000 claims abstract description 22
- 238000005303 weighing Methods 0.000 claims abstract description 10
- 238000005245 sintering Methods 0.000 claims abstract 5
- 238000010438 heat treatment Methods 0.000 claims abstract 4
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 claims description 58
- 229910052593 corundum Inorganic materials 0.000 claims description 46
- 239000010431 corundum Substances 0.000 claims description 46
- 238000000498 ball milling Methods 0.000 claims description 33
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 28
- 229910018072 Al 2 O 3 Inorganic materials 0.000 claims description 21
- 238000003801 milling Methods 0.000 claims description 18
- 229910010413 TiO 2 Inorganic materials 0.000 claims description 17
- 229910004298 SiO 2 Inorganic materials 0.000 claims description 10
- 238000002844 melting Methods 0.000 claims description 10
- 230000008018 melting Effects 0.000 claims description 10
- 239000000843 powder Substances 0.000 claims description 9
- 239000010453 quartz Substances 0.000 claims 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims 1
- 238000010923 batch production Methods 0.000 abstract description 3
- 239000000203 mixture Substances 0.000 description 10
- 238000002156 mixing Methods 0.000 description 9
- 239000012071 phase Substances 0.000 description 8
- 229910052573 porcelain Inorganic materials 0.000 description 6
- 239000013078 crystal Substances 0.000 description 5
- 239000002253 acid Substances 0.000 description 4
- 239000003513 alkali Substances 0.000 description 4
- 238000002441 X-ray diffraction Methods 0.000 description 3
- 239000000919 ceramic Substances 0.000 description 3
- 239000002223 garnet Substances 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000010532 solid phase synthesis reaction Methods 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000000975 co-precipitation Methods 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000005034 decoration Methods 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 239000011521 glass Substances 0.000 description 2
- 238000001027 hydrothermal synthesis Methods 0.000 description 2
- 238000003980 solgel method Methods 0.000 description 2
- 238000003786 synthesis reaction Methods 0.000 description 2
- 230000003796 beauty Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- RKTYLMNFRDHKIL-UHFFFAOYSA-N copper;5,10,15,20-tetraphenylporphyrin-22,24-diide Chemical compound [Cu+2].C1=CC(C(=C2C=CC([N-]2)=C(C=2C=CC=CC=2)C=2C=CC(N=2)=C(C=2C=CC=CC=2)C2=CC=C3[N-]2)C=2C=CC=CC=2)=NC1=C3C1=CC=CC=C1 RKTYLMNFRDHKIL-UHFFFAOYSA-N 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000008025 crystallization Effects 0.000 description 1
- 239000011351 dental ceramic Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000009970 fire resistant effect Effects 0.000 description 1
- 238000003837 high-temperature calcination Methods 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 238000001308 synthesis method Methods 0.000 description 1
- 230000002194 synthesizing effect Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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Abstract
The invention provides a green and environment-friendly leucite preparation method, which comprises the following steps: (1) weighing raw materials according to the formula of the leucite, grinding uniformly, and sieving to obtain a batch; (2) putting the batch obtained in the step (1) into a container for sintering, cooling, crushing and sieving to obtain an intermediate; (3) and (3) putting the intermediate obtained in the step (2) into a container for heat treatment, cooling, crushing and sieving to obtain the leucite. The leucite prepared by the method has the advantages of high purity, simple process, low cost, greenness, no pollution and suitability for batch production.
Description
Technical Field
The invention relates to the technical field of ceramics, in particular to a green and environment-friendly leucite preparation method.
Background
The leucite ceramics have been widely used in various fields such as biomedical (CN108742904A), architectural decoration (CN108727840A), automobile decoration (CN107619598A), and fire-resistant material (CN106278208A) due to its excellent mechanical properties, acid and alkali corrosion resistance, high refractive index, low density, and high expansion characteristics.
The leucite has good mechanical property and acid and alkali corrosion resistance, and in the cooling process, the crystal phase of the leucite is changed from a cubic phase to a tetragonal phase, and the accompanying volume shrinkage can generate compressive stress, thereby improving the strength of the matrix. Such as dental ceramic powder with thermal expansion coefficient of 8.5-9X10 -6 /° c) coefficient of thermal expansion compared to that of the commercial zirconia ceramic crown (10.5X 10) -6 /° c), reduces the mismatch of thermal expansion coefficients, has large brittleness of the porcelain powder, can improve the thermal expansion coefficients, the strength and the acid and alkali resistance of the porcelain powder by adding a small amount of leucite into the porcelain powder, and has basically consistent refractive index with the veneer porcelain, so the white garnet has the advantages of low thermal expansion coefficient, high strength, high acid and alkali resistance, and good heat resistance, heat resistance and the like heat resistance, heat resistanceStrong diffuse reflection can not be generated in the porcelain powder, namely, the light transmission (beauty) of the porcelain powder can not be influenced. In addition, the leucite can be co-fired with the zirconia powder to synthesize, and the thermal expansion coefficient of the leucite is adjusted. Other applications of leucites can be found in the exemplified patents, which are not listed here.
The application of the leucite mainly comprises directly using the leucite, and separating the leucite crystal phase (CN105837047B) in the glass phase or synthesizing the leucite and other crystal phases or materials into a composite crystal phase material (CN 110256063A). The quantity of leucite in nature is small, so artificial synthesis is needed. The synthesis method of leucite mainly comprises a solid phase method, a hydrothermal method, a sol-gel method, a coprecipitation method and the like. The solid phase method is mainly characterized in that the white garnet is melted into glass, then water quenched and then thermally treated for crystallization, so that the purity of the obtained white garnet is not very high, and the energy consumption is high; the hydrothermal method, the coprecipitation method and the sol-gel method can obtain the leucite with high powder granularity, high surface activity and high purity, but the raw material cost is higher, the synthesis process is complex, high-temperature calcination is also needed, and the comprehensive cost is higher. Compared with the prior art, the solid phase method has the advantages of simple, controllable and adjustable process, short process period, low cost and high energy consumption, can be reduced by adjusting the formula and the process, and is suitable for batch production.
Disclosure of Invention
The invention aims to provide a green and environment-friendly leucite preparation method to solve the problems in the prior art.
In order to achieve the purpose, the invention provides the following technical scheme:
a preparation method of green environment-friendly leucite comprises the following steps:
(1) the composition comprises the following components in percentage by weight: k 2 O21.58％，Al 2 O 3 23.40％，SiO 2 55.02 percent, the sum of the weight percent of the components is 100 percent, and Na is also added 2 CO 3 、TiO 2 And B 2 O 3 ，Na 2 CO 3 4-7 wt% of TiO, based on the total weight of the aforementioned components 2 0.5 wt% of the total weight of the foregoing components, B 2 O 3 Is 0.5 wt% of the total weight of the componentsWeighing raw materials, wherein K 2 O is represented by K 2 CO 3 Introduction of Al 2 O 3 From Al (OH) 3 Introducing; then putting all the raw materials into a rapid grinding machine of a corundum medium or a zirconia medium, uniformly mixing, taking industrial alcohol as a grinding aid, and sieving by a 300-mesh sieve to obtain a batch;
(2) putting the batch obtained in the step (1) into a corundum sagger, melting for 2h at 1500-;
(3) and (3) preserving the heat of the intermediate obtained in the step (2) at 900-.
The invention has the advantages that: the leucite prepared by the method has the advantages of high purity, simple process, low cost, greenness, no pollution and suitability for batch production.
Drawings
FIG. 1 is an XRD pattern of leucite incubated at 900-;
FIG. 2 is an XRD pattern of leucite incubated at 900-;
FIG. 3 is an XRD contrast of leucites incubated at 900-.
Detailed Description
The technical solutions of the present invention are described below by specific examples, which are only for illustrating the technical solutions of the present invention and are not intended to limit the scope of the present invention.
Example 1
A preparation method of green environment-friendly leucite comprises the following steps:
(1) the composition comprises the following components in percentage by weight: k 2 O21.58％，Al 2 O 3 23.40％，SiO 2 : 55.02 t%, the sum of the weight percentages of the components is 100%, and Na is also added 2 CO 3 、TiO 2 And B 2 O 3 ，Na 2 CO 3 4 wt% of the total weight of the aforementioned components, TiO 2 0.5 wt% of the total weight of the aforementioned components, B 2 O 3 Weighing raw materials in 0.5 wt% of the total weight of the above components, wherein K 2 O is represented by K 2 CO 3 Introduction of Al 2 O 3 From Al (OH) 3 Introducing; then putting all the raw materials into a rapid grinding machine of a corundum medium or a zirconia medium, uniformly mixing, taking industrial alcohol as a grinding aid, and sieving by a 300-mesh sieve to obtain a batch;
(2) and (2) putting the batch obtained in the step (1) into a corundum sagger, melting for 2 hours at 1600 ℃, cooling along with a furnace, taking out porous loose melt in the corundum sagger, putting the porous loose melt into a ball milling bottle of corundum medium or zirconia medium, performing roll milling, taking industrial alcohol as a grinding aid, and performing ball milling and sieving to obtain an intermediate.
(3) And (3) preserving the heat of the intermediate obtained in the step (2) at 900 ℃ for 2 hours, cooling the intermediate along with a furnace, taking the intermediate out, putting the intermediate into a ball milling bottle of corundum medium or zirconia medium for roll milling, taking industrial alcohol as a grinding aid, and performing ball milling and sieving to obtain leucite.
Example 2
A preparation method of green environment-friendly leucite comprises the following steps:
(1) the composition comprises the following components in percentage by weight: k is 2 O21.58％，Al 2 O 3 23.40％，SiO 2 : 55.02 t%, the sum of the weight percentages of the components is 100%, and Na is also added 2 CO 3 、TiO 2 And B 2 O 3 ，Na 2 CO 3 5 wt% of the total weight of the aforementioned components, TiO 2 0.5 wt% of the total weight of the aforementioned components, B 2 O 3 Weighing raw materials in 0.5 wt% of the total weight of the above components, wherein K 2 O is represented by K 2 CO 3 Introduction of Al 2 O 3 From Al (OH) 3 Introducing; then putting all the raw materials into a rapid grinding machine of a corundum medium or a zirconia medium, uniformly mixing, taking industrial alcohol as a grinding aid, and sieving by a 300-mesh sieve to obtain a batch;
(2) putting the batch obtained in the step (1) into a corundum sagger, melting for 2 hours at 1600 ℃, cooling along with a furnace, taking out porous loose melt in the corundum sagger, putting the porous loose melt into a ball milling bottle of corundum medium or zirconia medium, performing roll milling, taking industrial alcohol as a grinding aid, and performing ball milling and sieving to obtain an intermediate;
(3) and (3) preserving the heat of the intermediate obtained in the step (2) at 1000 ℃ for 2 hours, cooling the intermediate along with a furnace, taking the intermediate out, putting the intermediate into a ball milling bottle of corundum medium or zirconia medium for roll milling, taking industrial alcohol as a grinding aid, and performing ball milling and sieving to obtain leucite.
Example 3
A preparation method of green environment-friendly leucite comprises the following steps:
(1) the composition comprises the following components in percentage by weight: k 2 O21.58％，Al 2 O 3 23.40％，SiO 2 : 55.02 t%, the sum of the weight percentages of the components is 100%, and Na is also added 2 CO 3 、TiO 2 And B 2 O 3 ，Na 2 CO 3 TiO accounting for 6wt percent of the total weight of the components 2 0.5 wt% of the total weight of the foregoing components, B 2 O 3 Weighing raw materials in 0.5 wt% of the total weight of the above components, wherein K 2 O is represented by K 2 CO 3 Introduction of Al 2 O 3 From Al (OH) 3 Introducing; then putting all the raw materials into a rapid grinding machine of a corundum medium or a zirconia medium, uniformly mixing, taking industrial alcohol as a grinding aid, and sieving by a 300-mesh sieve to obtain a batch;
(2) putting the batch mixture obtained in the step (1) into a corundum sagger, melting for 2 hours at 1600 ℃, cooling along with a furnace, taking out porous loose melt in the corundum sagger, putting the porous loose melt into a ball milling bottle of corundum medium or zirconia medium, performing roll milling, and performing ball milling and sieving by using industrial alcohol as a grinding aid to obtain an intermediate;
(3) and (3) preserving the heat of the intermediate obtained in the step (2) at 1100 ℃ for 2 hours, cooling the intermediate along with a furnace, taking the intermediate out, putting the intermediate into a ball milling bottle made of corundum medium or zirconia medium for roll milling, taking industrial alcohol as a grinding aid, and performing ball milling and sieving to obtain leucite.
Example 4
A preparation method of green environment-friendly leucite comprises the following steps:
(1) the composition comprises the following components in percentage by weight: k 2 O21.58％，Al 2 O 3 23.40％，SiO 2 : 55.02 t%, the sum of the weight percentages of the components is 100%, and Na is also added 2 CO 3 、TiO 2 And B 2 O 3 ，Na 2 CO 3 7 wt% of the total weight of the aforementioned components, TiO 2 0.5 wt% of the total weight of the aforementioned components, B 2 O 3 Weighing raw materials in 0.5 wt% of the total weight of the above components, wherein K 2 O is represented by K 2 CO 3 Introduction of Al 2 O 3 From Al (OH) 3 Introducing; then putting all the raw materials into a rapid grinding machine of a corundum medium or a zirconia medium, uniformly mixing, taking industrial alcohol as a grinding aid, and sieving by a 300-mesh sieve to obtain a batch;
(2) putting the batch obtained in the step (1) into a corundum sagger, melting for 2 hours at 1600 ℃, cooling along with a furnace, taking out porous loose melt in the corundum sagger, putting the porous loose melt into a ball milling bottle of corundum medium or zirconia medium, performing roll milling, taking industrial alcohol as a grinding aid, and performing ball milling and sieving to obtain an intermediate;
(3) and (3) preserving the heat of the intermediate obtained in the step (2) at 1200 ℃ for 2h, cooling along with the furnace, taking out, putting into a ball milling bottle of corundum medium or zirconia medium for roll milling, taking industrial alcohol as a grinding aid, and performing ball milling and sieving to obtain leucite.
Example 5
A preparation method of green environment-friendly leucite comprises the following steps:
(1) the composition comprises the following components in percentage by weight: k 2 O21.58％，Al 2 O 3 23.40％，SiO 2 : 55.02 t%, the sum of the weight percentages of the components is 100%, and Na is also added 2 CO 3 、TiO 2 And B 2 O 3 ，Na 2 CO 3 4 wt% of the total weight of the aforementioned components, TiO 2 Is 0 of the total weight sum of the components.5wt％，B 2 O 3 Weighing the raw materials in 0.5 wt% of the total weight of the components, wherein K 2 O is represented by K 2 CO 3 Introduction of Al 2 O 3 From Al (OH) 3 Introducing; then putting all the raw materials into a rapid grinding machine of a corundum medium or a zirconia medium, uniformly mixing, taking industrial alcohol as a grinding aid, and sieving by a 300-mesh sieve to obtain a batch;
(2) putting the batch mixture obtained in the step (1) into a corundum sagger, melting for 2 hours at 1500 ℃, cooling along with a furnace, taking out porous loose melt in the corundum sagger, putting the porous loose melt into a ball milling bottle of corundum medium or zirconia medium, performing roll milling, taking industrial alcohol as a grinding aid, and performing ball milling and sieving to obtain an intermediate;
(3) and (3) preserving the heat of the intermediate obtained in the step (2) at 900 ℃ for 2 hours, cooling along with a furnace, taking out, putting into a ball milling bottle of a corundum medium or a zirconia medium for roll milling, taking industrial alcohol as a grinding aid, and performing ball milling and sieving to obtain leucite.
Example 6
A preparation method of green environment-friendly leucite comprises the following steps:
(1) the composition comprises the following components in percentage by weight: k 2 O21.58％，Al 2 O 3 23.40％，SiO 2 : 55.02 t%, the sum of the weight percentages of the components is 100%, and Na is also added 2 CO 3 、TiO 2 And B 2 O 3 ，Na 2 CO 3 5 wt% of the total weight of the aforementioned components, TiO 2 0.5 wt% of the total weight of the foregoing components, B 2 O 3 Weighing raw materials in 0.5 wt% of the total weight of the above components, wherein K 2 O is represented by K 2 CO 3 Introduction of Al 2 O 3 From Al (OH) 3 Introducing; then putting all the raw materials into a rapid grinding machine of a corundum medium or a zirconia medium, uniformly mixing, taking industrial alcohol as a grinding aid, and sieving by a 300-mesh sieve to obtain a batch;
(2) putting the batch obtained in the step (1) into a corundum sagger, melting for 2 hours at 1500 ℃, cooling along with a furnace, taking out porous loose melt in the corundum sagger, putting the porous loose melt into a ball milling bottle of corundum medium or zirconia medium for roll milling, taking industrial alcohol as a grinding aid, and performing ball milling and sieving to obtain an intermediate;
(3) and (3) preserving the heat of the intermediate obtained in the step (2) at 1000 ℃ for 2 hours, cooling along with a furnace, taking out, putting into a ball milling bottle of a corundum medium or a zirconia medium, performing roll milling, taking industrial alcohol as a grinding aid, and performing ball milling and sieving to obtain leucite.
Example 7
A preparation method of green environment-friendly leucite comprises the following steps:
(1) the composition comprises the following components in percentage by weight: k 2 O21.58％，Al 2 O 3 23.40％，SiO 2 : 55.02 t%, the sum of the weight percentages of the components is 100%, and Na is also added 2 CO 3 、TiO 2 And B 2 O 3 ，Na 2 CO 3 TiO accounting for 6wt percent of the total weight of the components 2 0.5 wt% of the total weight of the foregoing components, B 2 O 3 Weighing raw materials in 0.5 wt% of the total weight of the above components, wherein K 2 O is represented by K 2 CO 3 Introduction of Al 2 O 3 From Al (OH) 3 Introducing; then putting all the raw materials into a rapid grinding machine of a corundum medium or a zirconia medium, uniformly mixing, taking industrial alcohol as a grinding aid, and sieving by a 300-mesh sieve to obtain a batch;
(2) putting the batch obtained in the step (1) into a corundum sagger, melting for 2 hours at 1500 ℃, cooling along with a furnace, taking out porous loose melt in the corundum sagger, putting the porous loose melt into a ball milling bottle of corundum medium or zirconia medium for roll milling, taking industrial alcohol as a grinding aid, and performing ball milling and sieving to obtain an intermediate;
(3) and (3) preserving the heat of the intermediate obtained in the step (2) at 1100 ℃ for 2h, cooling along with a furnace, taking out, putting into a ball milling bottle of a corundum medium or a zirconia medium for roll milling, taking industrial alcohol as a grinding aid, and performing ball milling and sieving to obtain leucite.
Example 8
A preparation method of green environment-friendly leucite comprises the following steps:
(1) according to the following weight percentageComprises the following components in percentage by weight: k 2 O21.58％，Al 2 O 3 23.40％，SiO 2 : 55.02 t%, the sum of the weight percentages of the components is 100%, and Na is also added 2 CO 3 、TiO 2 And B 2 O 3 ，Na 2 CO 3 7 wt% of the total weight of the aforementioned components, TiO 2 0.5 wt% of the total weight of the aforementioned components, B 2 O 3 Weighing the raw materials in 0.5 wt% of the total weight of the components, wherein K 2 O is represented by K 2 CO 3 Introduction of Al 2 O 3 From Al (OH) 3 Introducing; then putting all the raw materials into a rapid grinding machine of a corundum medium or a zirconia medium, uniformly mixing, taking industrial alcohol as a grinding aid, and sieving by a 300-mesh sieve to obtain a batch;
(2) putting the batch obtained in the step (1) into a corundum sagger, melting for 2 hours at 1500 ℃, cooling along with a furnace, taking out porous loose melt in the corundum sagger, putting the porous loose melt into a ball milling bottle of corundum medium or zirconia medium for roll milling, taking industrial alcohol as a grinding aid, and performing ball milling and sieving to obtain an intermediate;
(3) and (3) preserving the heat of the intermediate obtained in the step (2) at 1200 ℃ for 2h, cooling along with the furnace, taking out, putting into a ball milling bottle of corundum medium or zirconia medium for roll milling, taking industrial alcohol as a grinding aid, and performing ball milling and sieving to obtain leucite.
Table 1 case data integration
From the XRD patterns, it can be seen that the leucite prepared under the process conditions of example 1 has the best main crystal phase and the highest purity.
Claims (7)
1. A green environment-friendly leucite preparation method is characterized by comprising the following steps: the method comprises the following steps:
(1) weighing raw materials according to the formula of the leucite, grinding uniformly, and sieving to obtain a batch;
(2) putting the batch obtained in the step (1) into a container for sintering, cooling, crushing and sieving to obtain an intermediate;
(3) and (3) putting the intermediate obtained in the step (2) into a container for heat treatment, cooling, crushing and sieving to obtain the leucite.
2. The method for preparing green environment-friendly leucite according to claim 1, characterized in that: the raw material of the step (1) comprises K 2 O、Al 2 O 3 Quartz powder and sintering aid Na 2 CO 3 、TiO 2 And B 2 O 3 。
3. The method for preparing green environment-friendly leucite according to claim 1, characterized in that: the formula of the leucite comprises the following components in percentage by weight: k 2 O21.58％，Al 2 O 3 23.40％，SiO 2 55.02 percent, the sum of the weight percent of the components is 100 percent, and Na is also added 2 CO 3 、TiO 2 And B 2 O 3 ，Na 2 CO 3 4-7 wt% of TiO, based on the total weight of the aforementioned components 2 0.5 wt% of the total weight of the aforementioned components, B 2 O 3 Is 0.5 wt% of the total weight of the components; wherein K is 2 O is represented by K 2 CO 3 Introduction of Al 2 O 3 From Al (OH) 3 Introducing; preferred is Na 2 CO 3 Is added in an amount of 5 wt% based on the sum of the aforementioned components.
4. The method for preparing green environment-friendly leucite according to claim 1, characterized in that: and (2) grinding the raw materials by adopting a quick grinding machine, wherein industrial alcohol is used as a grinding aid during grinding.
5. The method for preparing green environment-friendly leucite according to claim 1, characterized in that: the sieve used in the step (1) is 300 meshes.
6. The method for preparing environment-friendly leucite according to claim 1, wherein the method comprises the following steps: the sintering container in the step (2) is a corundum sagger, the sintering temperature is 1500-1600 ℃, and the melting time is 2 h; the cooling method is furnace cooling; the grinding method is that the sintered frit is put into a ball mill bottle of corundum medium or zirconia medium for roll milling, and industrial alcohol is used as a grinding aid; the sieved sieve is 300 meshes.
7. The method for preparing green environment-friendly leucite according to claim 1, characterized in that: the heat treatment container in the step (3) is a corundum sagger, the heat treatment temperature is 900-; the cooling method is furnace cooling; the grinding method comprises the steps of putting sintered frit into a ball milling bottle of corundum medium or zirconia medium for roll milling, and taking industrial alcohol as a grinding aid; the sieved sieve is 300 meshes.
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