CN108101504B - High-whiteness ceramic blank and manufacturing method thereof - Google Patents
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Abstract
The invention discloses a high-whiteness ceramic blank and a manufacturing method thereof, wherein the high-whiteness ceramic blank is prepared from the following components in parts by weight: 6-8 parts of medium white sodium sand, 6-10 parts of water mill potassium sand, 12-17 parts of medium temperature white sand, 6-8 parts of washing mud, 2.5-4 parts of Guangxi sodalite, 8-12 parts of high potassium sand, 4.5-6 parts of medium temperature sand, 5-8 parts of bentonite, 10-14 parts of Huaijing sand, 14-18 parts of Yangshan stone powder, 2-4 parts of talc mud, 12-15 parts of mixed mud, 4-7 parts of high alumina powder and 3-5 parts of whitening complexing agent. The whiteness of the high-whiteness ceramic blank can be increased by more than 10 degrees, the ceramic blank does not contain radioactive composite materials, the cost is lower than that of the ceramic blank containing zirconium silicate, and the raw material cost of 1/3 is reduced approximately.
Description
Technical Field
The invention relates to a ceramic manufacturing technology, in particular to a high-whiteness ceramic blank and a manufacturing method thereof.
Background
At present, with the quality of the raw materials for the existing ceramic blank body getting lower and lower, there are two general methods for producing the blank body by the existing white blank brick, the first method is the most conventional method: zirconium silicate is introduced into the blank raw material, the method can increase the whiteness of the blank to a certain degree, but the raw material cost is high, the market price of the zirconium silicate is 1.2 ten thousand per ton, and the radioactivity of the zirconium silicate is too strong, so that the zirconium silicate is harmful to human bodies. Another is to use relatively high grade water washed raw materials, which has limited whitening effect and is relatively expensive.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides a high-whiteness ceramic blank. The whiteness of the high-whiteness ceramic blank can be increased by more than 10 degrees, the ceramic blank does not contain radioactive composite materials, the cost is lower than that of the ceramic blank containing zirconium silicate, and the raw material cost of 1/3 is reduced approximately.
The second objective of the present invention is to provide a method for manufacturing a ceramic blank with enhanced whiteness. The preparation method is suitable for the original production line, and has better whitening effect and lower raw material cost.
One of the purposes of the invention is realized by adopting the following technical scheme: a high-whiteness ceramic blank is prepared from the following components in parts by weight: 6-8 parts of medium white sodium sand, 6-10 parts of water mill potassium sand, 12-17 parts of medium temperature white sand, 6-8 parts of washing mud, 2.5-4 parts of Guangxi sodalite, 8-12 parts of high potassium sand, 4.5-6 parts of medium temperature sand, 5-8 parts of bentonite, 10-14 parts of Huaijing sand, 14-18 parts of Yangshan stone powder, 2-4 parts of talc mud, 12-15 parts of mixed mud, 4-7 parts of high alumina powder and 3-5 parts of whitening complexing agent.
Further, the whitening complexing agent consists of 80-95% of alumina powder and 5-8% of barium carbonate by mass, and the sum of the mass fractions of the components is 100%.
The second purpose of the invention is realized by adopting the following technical scheme: a method for manufacturing a ceramic blank with increased whiteness of the blank comprises,
ball milling: proportioning according to the formula amount of the high-whiteness ceramic blank, and then carrying out ball milling for 8-12h by using a ball mill;
removing iron from the slurry and sieving: filtering and removing iron by using a screen with 70-90 meshes to obtain slurry;
and (3) ageing the slurry: aging the slurry after iron removal for 1 day at room temperature;
preparing powder material: preparing the aged slurry into powder by using a spray tower;
aging the powder: placing the powder at room temperature for aging for 1 day;
removing iron from the powder and sieving: filtering the aged powder material by using a screen of 10-30 meshes, and removing iron to obtain a blank;
pressing and forming: and (3) placing the blank into a press, pressing under the action of a mould, and then conveying the blank into a burning furnace for burning and forming.
Further, in the step of ball milling, the high-whiteness ceramic blank is prepared from the following components in parts by weight: 6-8 parts of medium white sodium sand, 6-10 parts of water mill potassium sand, 12-17 parts of medium temperature white sand, 6-8 parts of washing mud, 2.5-4 parts of Guangxi sodalite, 8-12 parts of high potassium sand, 4.5-6 parts of medium temperature sand, 5-8 parts of bentonite, 10-14 parts of Huaijing sand, 14-18 parts of Yangshan stone powder, 2-4 parts of talc mud, 12-15 parts of mixed mud, 4-7 parts of high alumina powder and 3-5 parts of whitening complexing agent; the whitening complexing agent consists of 80-95% of alumina powder and 5-8% of barium carbonate, and the sum of the mass fractions of the components is 100%.
Further, in the step of ball milling, the ball milling time is 10 hours, the fineness of the powder after ball milling is controlled to be 250 meshes, and the screen allowance is 0.8-1.0%.
Further, in the step of removing iron from the slurry and sieving, the step is repeated three times.
Further, in the steps of removing iron from the slurry and sieving, the mesh number of the sieve is 80 meshes.
Further, in the step of removing iron from the powder and screening the powder, the mesh number of the screen is 20 meshes.
Further, in the step of pressing and forming, the pressing conditions are as follows: the pressing is carried out by adopting the pressure of 28000-30000N, and the pressing frequency is 4.6 times/min.
Further, in the step of pressing and forming, the firing conditions are as follows: firing at 1175-1180 deg.c for 48-55 min.
Compared with the prior art, the invention has the beneficial effects that:
the composite whitening agent of the aluminum oxide and the barium carbonate is added to replace the original zirconium silicate, and the composite material does not contain radioactivity, so that the cost is reduced by about 1/3 compared with the cost of a ceramic blank containing the zirconium silicate; in addition, the requirement of the whiteness of the ceramic blank also meets the whiteness of the ceramic blank containing zirconium silicate. Compared with the ceramic blank without the whitening agent, the whiteness of the high-whiteness ceramic blank can be increased by more than 10 degrees.
Drawings
FIG. 1 is a graph showing a comparison of whiteness of green bodies of the same size prepared in example 1 and comparative examples 1-2.
In the figure, A is the ceramic green body obtained in comparative example 1; b is the ceramic green body prepared in example 1; c is the ceramic green body obtained in comparative example 2.
Detailed Description
The present invention will be further described with reference to the accompanying drawings and the detailed description, and it should be noted that any combination of the embodiments or technical features described below can be used to form a new embodiment without conflict.
In the present invention, all parts and percentages are by weight, unless otherwise specified, and the equipment and materials used are commercially available or commonly used in the art. The methods in the following examples are conventional in the art unless otherwise specified.
A high-whiteness ceramic blank is prepared from the following components in parts by weight: 6-8 parts of medium white sodium sand, 6-10 parts of water mill potassium sand, 12-17 parts of medium temperature white sand, 6-8 parts of washing mud, 2.5-4 parts of Guangxi sodalite, 8-12 parts of high potassium sand, 4.5-6 parts of medium temperature sand, 5-8 parts of bentonite, 10-14 parts of Huaijing sand, 14-18 parts of Yangshan stone powder, 2-4 parts of talc mud, 12-15 parts of mixed mud, 4-7 parts of high alumina powder and 3-5 parts of whitening complexing agent.
Specifically, the whitening complexing agent consists of 80-95% of alumina powder and 5-8% of barium carbonate by mass, and the sum of the mass fractions of the components is 100%.
The composite whitening agent of the aluminum oxide and the barium carbonate is added to replace the original zirconium silicate (the market price is 1.2 ten thousand per ton), and the market price of the composite whitening agent of the aluminum oxide and the barium carbonate is 5.5 thousand per ton, so that the raw material cost can be reduced, and the composite material does not contain radioactivity.
A method for manufacturing a ceramic blank with increased whiteness of the blank comprises,
ball milling: preparing materials according to the formula amount of the high-whiteness ceramic blank, and then performing ball milling for 8-12 hours by using a ball mill; preferably, the ball milling time is 10 hours, the fineness of the powder after ball milling is controlled to be 250 meshes, and the screen allowance is 0.8-1.0%.
Removing iron from the slurry and sieving: filtering and removing iron by using a screen with 70-90 meshes to obtain slurry; preferably, the mesh number of the screen is 80 meshes. The step is repeated for three times, and the step of removing iron is carried out for multiple times, so that the whiteness of the blank body is favorably improved.
And (3) ageing the slurry: aging the slurry after iron removal for 1 day at room temperature;
preparing powder material: preparing the aged slurry into powder by using a spray tower;
aging the powder: placing the powder at room temperature for aging for 1 day;
removing iron from the powder and sieving: filtering the aged powder material by using a screen of 10-30 meshes, and removing iron to obtain a blank; preferably, the mesh number of the screen is 20 meshes.
Pressing and forming: placing the blank into a press, and pressing under the action of a mould, wherein the pressing conditions are as follows: the pressing is carried out by adopting the pressure of 28000-30000N, and the pressing frequency is 4.6 times/min. Then the mixture is conveyed into a burning furnace for burning and forming. The firing conditions were as follows: firing at 1175-1180 deg.c for 48-55 min.
The following are specific examples of the present invention, and raw materials, equipments and the like used in the following examples can be obtained by purchasing them unless otherwise specified.
Examples 1-3 and comparative examples 1-2:
the raw materials are weighed according to the mixture ratio in the following table 1 respectively, and the preparation is carried out according to the following steps, wherein the difference lies in that the mixture ratio of the added raw materials is different, and the product is prepared, and the specific details are shown in the table 1:
table 1: raw material proportioning tables of examples 1 to 3 and comparative examples 1 to 2
The method for manufacturing the high-whiteness ceramic green body according to examples 1 to 3, comprising,
ball milling: preparing materials according to the formula amount of the ceramic blank, and then carrying out ball milling for 10 hours by using a ball mill; after ball milling, the fineness of the powder is controlled to be 250 meshes, and the screen residue is 0.8-1.0%.
Removing iron from the slurry and sieving: filtering and removing iron by using a 80-mesh screen to obtain slurry;
and (3) ageing the slurry: aging the slurry after iron removal for 1 day at room temperature;
preparing powder material: preparing the aged slurry into powder by using a spray tower;
aging the powder: placing the powder at room temperature for aging for 1 day;
removing iron from the powder and sieving: filtering and removing iron from the aged powder by using a 20-mesh screen to obtain a blank;
pressing and forming: placing the blank into a press, and pressing under the action of a mould, wherein the pressing conditions are as follows: the pressing is carried out by adopting the pressure of 28000-30000N, and the pressing frequency is 4.6 times/min. Then the mixture is conveyed into a burning furnace for burning and forming. The firing conditions were as follows: firing at 1175-1180 deg.c for 48-55 min.
Effect evaluation and Performance detection
1. The whiteness of the ceramic green bodies of example 1 and comparative examples 1 to 2 was measured according to the method for measuring whiteness in GBT/5950 building materials and nonmetallic mineral products, and the items and results of the measurement are shown in table 2 and fig. 1.
Table 2: whiteness test results of examples 1 to 3 and comparative examples 1 to 2
Experiments prove that the whiteness degree of the whitening agent composite material added with 3 percent of the whitening agent composite material in the blank is the same as the whiteness degree of the whitening agent composite material added with 2 percent of the existing whitening agent zirconium silicate, the temperature of the blank is not influenced, and the whiteness can be increased by more than 10 degrees. In addition, the whiteness is increased with the increase of the addition amount.
The above embodiments are only preferred embodiments of the present invention, and the protection scope of the present invention is not limited thereby, and any insubstantial changes and substitutions made by those skilled in the art based on the present invention are within the protection scope of the present invention.
Claims (8)
1. The high-whiteness ceramic blank is characterized by being prepared from the following components in parts by weight: 6-8 parts of medium white sodium sand, 6-10 parts of water mill potassium sand, 12-17 parts of medium temperature white sand, 6-8 parts of washing mud, 2.5-4 parts of Guangxi sodalite, 8-12 parts of high potassium sand, 4.5-6 parts of medium temperature sand, 5-8 parts of bentonite, 10-14 parts of Huaijing sand, 14-18 parts of Yangshan stone powder, 2-4 parts of talc mud, 12-15 parts of mixed mud, 4-7 parts of high alumina powder and 3-5 parts of whitening complexing agent;
the whitening complexing agent consists of 80-95% of alumina powder and 5-8% of barium carbonate, and the sum of the mass fractions of the components is 100%.
2. A method for manufacturing a high-whiteness ceramic green body according to claim 1, comprising,
ball milling: proportioning according to the formula amount of the high-whiteness ceramic blank, and then carrying out ball milling for 8-12h by using a ball mill;
removing iron from the slurry and sieving: filtering and removing iron by using a screen with 70-90 meshes to obtain slurry;
and (3) ageing the slurry: aging the slurry after iron removal for 1 day at room temperature;
preparing powder material: preparing the aged slurry into powder by using a spray tower;
aging the powder: placing the powder at room temperature for aging for 1 day;
removing iron from the powder and sieving: filtering the aged powder material by using a screen of 10-30 meshes, and removing iron to obtain a blank;
pressing and forming: and (3) placing the blank into a press, pressing under the action of a mould, and then conveying the blank into a burning furnace for burning and forming.
3. The method for manufacturing a high-whiteness ceramic green body according to claim 2, wherein in the step of ball milling, the ball milling time is 10 hours, the fineness of the powder after ball milling is controlled to be 250 meshes, and the screen residue is 0.8-1.0%.
4. The method of manufacturing a high-whiteness ceramic green body according to claim 2, wherein the step of removing iron from the slurry and sieving is repeated three times.
5. The method for manufacturing a ceramic green body with high whiteness according to claim 2, wherein the mesh number of the screen is 80 mesh in the steps of removing iron from slurry and screening.
6. The method for manufacturing a ceramic green body with high whiteness according to claim 2, wherein the mesh number of the screen is 20 meshes in the steps of removing iron from the powder and screening the powder.
7. The method for manufacturing a high-whiteness ceramic green body according to claim 2, wherein in the step of pressing and forming, the pressing conditions are as follows: the pressing is carried out by adopting the pressure of 28000-30000N, and the pressing frequency is 4.6 times/min.
8. The method for manufacturing a high-whiteness ceramic green body according to claim 2, wherein in the step of pressing and molding, the firing conditions are as follows: firing at 1175-1180 deg.c for 48-55 min.
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