CN112091224A - Method for preparing metal chromium powder by ultralow temperature grinding - Google Patents
Method for preparing metal chromium powder by ultralow temperature grinding Download PDFInfo
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Abstract
The invention discloses a method for preparing metal chromium powder by ultra-low temperature grinding, which relates to the technical field of metal powder preparation and comprises the following steps: s1, crushing, namely crushing the original chromium block by a crusher, and ensuring that the particle size of the crushed chromium block is less than 10 mm; s2, ultra-low temperature grinding, namely grinding the crushed chromium blocks at low temperature to prepare powder, introducing a protective medium, and controlling the temperature to be-150-0 ℃; s3, drying, namely performing vacuum drying treatment on the chromium powder after low-temperature grinding, and controlling the temperature to be 60-100 ℃; s4, screening, namely screening and grading the dried chromium powder, and selecting a target screen to obtain the target particle size; the metal chromium powder prepared by the invention has low impurity element content and low gas content, and the appearance of chromium particles is irregular.
Description
Technical Field
The invention relates to the technical field of metal powder preparation, in particular to a method for preparing metal chromium powder by ultralow temperature grinding.
Background
Chromium is an important alloy element, and is widely applied to the fields of metallurgy, chemical industry, cast iron, fire resistance, high-precision science and technology and the like because of the excellent characteristics of hardness, brittleness, corrosion resistance and the like.
The metal chromium powder is widely applied to copper chromium contacts, vacuum sputtering coating targets, high-temperature alloy materials, 3D printing materials, high-performance welding materials, chromium-containing powder metallurgy products and the like.
At present, the method for producing chromium powder at home and abroad is a mechanical grinding method.
Mechanical grinding method: a method for producing a metal or alloy powder by mechanical pulverization. The method mainly comprises a ball milling method and a fluidized bed airflow milling method.
Ball milling method: this is usually done by charging the material into a ball mill. In the ball milling process, materials are among the grinding balls which are stirred intensively and are subjected to repeated actions of impact force, grinding force, shearing force and pressure, so that the materials are continuously deformed, crushed and cold welded. The method can be directly used for producing brittle and hard metal or oxide powder; meanwhile, the method can also be used for treating the agglomeration of metal powder, atomized powder or electrolytic powder by a reduction method.
Fluidized bed jet milling: the material particles are accelerated by the compressed gas in the fluidized bed and are micronized by the collision of the high velocity particles with the particles.
Ball milling method: the impurity content and the gas content of the chromium powder are obviously increased after ball milling.
Fluidized bed jet milling: the prepared chromium powder has excessively fine particle size and excessively high surface adsorbed gas content.
Disclosure of Invention
In order to solve the technical problem, the invention provides a method for preparing metal chromium powder by ultralow temperature grinding.
The technical scheme of the invention is as follows: a method for preparing metal chromium powder by ultra-low temperature grinding comprises the following steps:
s1: crushing
Selecting original chromium blocks, then putting the selected chromium blocks into liquid nitrogen for freezing for 1h, crushing the frozen metal chromium blocks by a crusher, filtering the crushed chromium particles by a screen, wherein the size of the aperture of the screen is 10mm, secondarily crushing the particles left on the screen, and refrigerating the particles passing through the screen;
s2: ultra-low temperature grinding
Placing the refrigerated particles into a grinder, adding grinding medium, introducing protective medium liquid nitrogen, controlling the grinding temperature at-150-0 deg.C, controlling the flow rate of liquid nitrogen at 5-10 m/h, grinding for 2-5h, collecting the powder, elutriating with gasoline, wherein the liquid level of gasoline is higher than that of chromium powder, and adding nano Al during elutriation2O3And ZrO2Mixing to obtain high-toughness ceramic blocks, wherein the particle diameter of the high-toughness ceramic blocks is 0.5-1cm, fishing the ceramic blocks by using a screen after the elutriation is finished, and then filtering out chromium powder by using filter cloth;
s3: drying by baking
Putting the chromium powder obtained in the step S2 into a drying device, drying at 60-100 ℃ for 0.5-0.8h, stirring at the stirring speed of 10-20r/min during drying, recovering evaporated gasoline during drying, reusing, vacuumizing the drying device at the vacuum degree of 6-7Pa, and airing at low temperature for 20-30min after drying;
s4: sieving
And (3) grading and screening the clean chromium powder obtained in the step (S3), carrying out multi-stage screening according to the particle size of the chromium powder, carrying out middle-stage screening to obtain low-grade powder and high-grade powder, simultaneously subdividing the high-grade chromium powder and the low-grade chromium powder, collecting powder which does not reach the standard in the low-grade powder, and repeating the steps (S2) -S4).
Further, in the step S2, when grinding, the power of the grinder is first adjusted to the ball-milling rotation number of 100r/min, and after 1 hour, the ball-milling rotation number is then adjusted to 500r/min, and the grinding is continued to be performed to be powder.
Further, standing the gasoline washed in the step S2 for 12-18h, taking a hose, introducing the supernatant onto industrial anti-static filter cloth by using a siphon principle, collecting the filtrate below the filter cloth by using a barrel, repeating the steps for three times, and recycling the gasoline.
Further, the chromium powder obtained in the step S4 is led into a microwave heating furnace for decarburization treatment, the heating temperature is 450-610 ℃, the heating time is 30min, after heating is finished, the temperature is cooled to room temperature, and graphite particles are separated to obtain the decarburized chromium powder.
Further, the decarburized chromium powder is introduced into a ceramic container provided with a hydrogen plasma radio frequency device, the decarburized chromium powder is subjected to reduction deoxidation by using hydrogen as reducing gas, and a cooling device is arranged in the container.
Further, in the step S2, the grinding medium in the grinder is tungsten steel, the lining is made of zirconia, liquid nitrogen is used as temperature-controlled gas during grinding, helium is introduced as protective gas, the gas flow is 10-25m for cultivation/h, and the ball-to-material ratio is 10: 1.
Further, sampling and detecting the chromium powder after deoxidation, wherein the detection items comprise carbon content, oxygen content, color and chemical components, and the chromium powder qualified in detection is subjected to bag-dividing vacuum packaging and then enters a storage link.
Further, in the elutriation in step S2, the magnet is added to the chromium powder, the elutriation is performed by electromagnetic stirring, and the iron powder on the magnet is cleaned after the elutriation is completed.
Further, the nano Al2O3And ZrO2The preparation method of the high-toughness ceramic block prepared by mixing comprises the following steps:
s2-1: mixing nano Al2O3Powder and ZrO2Mixing the powder according to the weight ratio of 1:1, and uniformly mixing in an electromagnetic stirring device to obtain a mixed additive;
s2-2: breaking the porcelain stone to 1-2cm3Grinding the materials in a grinding device to obtain grinding powder, elutriating the grinding powder, removing impurities, adding the mixed additive obtained in S2-1, wherein the weight ratio of the mixed additive to the grinding powder is 1:20, stirring elutriation liquid, uniformly stirring, precipitating for 24 hours, and filtering precipitate liquid to obtain soft mud blocks;
s2-3: and drying the soft mud blocks to obtain hard mud blocks, cutting the hard mud blocks into a specified size, and firing to obtain the finished high-toughness ceramic blocks.
The invention has the beneficial effects that:
(1) the method can reduce impurities in the chromium powder through elutriation, can also remove iron elements in the chromium powder, can reduce the oxygen content in the chromium powder through deoxidation treatment, and can effectively reduce the carbon content in the chromium powder through a carbon removal process.
(2) The metal chromium powder prepared by the invention has the advantages that: the increment of impurity elements is low, the gas content is low, and the shape of chromium particles is irregular.
Detailed Description
Example 1:
a method for preparing metal chromium powder by ultra-low temperature grinding comprises the following steps:
s1: crushing
Selecting original chromium blocks, then putting the selected chromium blocks into liquid nitrogen for freezing for 0.5h, crushing the frozen metal chromium blocks by a crusher, filtering the crushed chromium particles by a screen, wherein the aperture of the screen is 10mm, secondarily crushing the particles left on the screen, and refrigerating the particles passing through the screen;
s2: ultra-low temperature grinding
Put cold-stored granule into the machine of grinding, add grinding medium, and let in protection medium liquid nitrogen, grinding temperature control is at-150 ℃, the liquid nitrogen velocity of flow is 5m for thin year/h, it is 2h to grind duration, earlier when grinding machine power adjustment ball-milling revolution number 100r/min, last 1h back, again will grind ball-milling revolution number and transfer to 500r/min and continue to grind to powdered, grinding medium in the machine of grinding is the tungsten steel, the inside lining is the zirconia material, liquid nitrogen is as accuse temperature gas in the course of grinding, let in addition and let in the helium as protective gas, gas flow is 10m mansion/h, the ball material ratio is 10:1, collecting the powder obtained after grinding, elutriating by adopting gasoline, wherein the liquid level of the gasoline is higher than that of the chromium powder, and adding nano Al during elutriation2O3And ZrO2Mixing the prepared high-toughness ceramic blocks, wherein the particle diameter of each high-toughness ceramic block is 0.5cm, fishing the ceramic blocks by using a screen after elutriation is finished, filtering out chromium powder by using filter cloth, standing the elutriated gasoline for 12 hours, taking a hose, introducing a supernatant onto industrial anti-static filter cloth by using a siphon principle, collecting a filtrate below the filter cloth by using a barrel, repeating the process for three times, recycling the gasoline, adding a magnet into the chromium powder during elutriation, elutriating by using an electromagnetic stirring mode, and cleaning iron powder on the magnet after elutriation is finished;
s3: drying by baking
Putting the chromium powder obtained in the step S2 into a drying device, drying at 60 ℃ for 0.5h, stirring at the stirring speed of 10r/min during drying, recovering evaporated gasoline during drying, recycling, vacuumizing the drying device at the vacuum degree of 6Pa, and airing at the low temperature of 4 ℃ for 20min after drying;
s4: sieving
Classifying and screening the clean chromium powder obtained in the step S3, performing multi-stage screening according to the particle size of the chromium powder, performing intermediate-stage screening to obtain low-grade powder and high-grade powder, subdividing the high-grade chromium powder and the low-grade chromium powder simultaneously, collecting substandard powder in the low-grade powder, repeating the steps S2-S4, introducing the obtained chromium powder into a microwave heating furnace for decarburization treatment, heating at 450 ℃ for 30min, cooling to room temperature after heating is completed, separating graphite particles to obtain decarburized chromium powder, introducing the decarburized chromium powder into a ceramic container provided with hydrogen plasma radio frequency equipment, reducing and deoxidizing the decarburized chromium powder by using hydrogen as reducing gas, installing a cooling device in the container, sampling and detecting the decarburized chromium powder, wherein detection items comprise carbon content, oxygen content, color and luster and chemical components, and qualified detected chromium powder, performing bag-dividing vacuum packaging, and then entering a storage link;
the nano Al2O3And ZrO2The preparation method of the high-toughness ceramic block prepared by mixing comprises the following steps:
s2-1: mixing nano Al2O3Powder and ZrO2Mixing the powder according to the weight ratio of 1:1, and uniformly mixing in an electromagnetic stirring device to obtain a mixed additive;
s2-2: breaking the porcelain stone to 1cm3Grinding the materials in a grinding device to obtain grinding powder, elutriating the grinding powder, removing impurities, adding the mixed additive obtained in S2-1, wherein the weight ratio of the mixed additive to the grinding powder is 1:20, stirring elutriation liquid, uniformly stirring, precipitating for 24 hours, and filtering precipitate liquid to obtain soft mud blocks;
s2-3: and drying the soft mud blocks to obtain hard mud blocks, cutting the hard mud blocks into a specified size, and firing to obtain the finished high-toughness ceramic blocks.
Example 2:
a method for preparing metal chromium powder by ultra-low temperature grinding comprises the following steps:
s1: crushing
Selecting original chromium blocks, then putting the selected chromium blocks into liquid nitrogen for freezing for 0.7h, crushing the frozen metal chromium blocks by a crusher, filtering the crushed chromium particles by a screen, wherein the aperture of the screen is 10mm, secondarily crushing the particles left on the screen, and refrigerating the particles passing through the screen;
s2: ultra-low temperature grinding
Grinding the refrigerated granulesGrinding the mixture into powder, wherein the grinding medium is added into a grinding machine, liquid nitrogen serving as a protective medium is introduced into the grinding machine, the grinding temperature is controlled to be-100 ℃, the flow speed of the liquid nitrogen is 7.5 m/h, the grinding time is 3.5h, the power of the grinding machine is adjusted to the grinding rotation number of 100r/min during grinding, the grinding rotation number of the grinding ball is adjusted to 500r/min after the grinding is continued for 1h, the grinding is continued to be ground into powder, the grinding medium in the grinding machine is tungsten steel, the lining is made of zirconium oxide, liquid nitrogen serves as temperature control gas during grinding, helium serves as protective gas is introduced into the grinding machine, the gas flow is 18m of profile/h, the ball-to-material ratio is 10:1, the powder obtained after grinding is collected and elutriated by adopting gasoline, the liquid level of2O3And ZrO2Mixing the prepared high-toughness ceramic blocks, wherein the particle diameter of each high-toughness ceramic block is 0.7cm, fishing out the ceramic blocks by using a screen after elutriation is finished, filtering out chromium powder by using filter cloth, standing the elutriated gasoline for 15 hours, taking a hose, introducing a supernatant onto industrial anti-static filter cloth by using a siphon principle, collecting a filtrate below the filter cloth by using a barrel, repeating the process for three times, recycling the gasoline, adding a magnet into the chromium powder during elutriation, elutriating by using an electromagnetic stirring mode, and cleaning iron powder on the magnet after elutriation is finished;
s3: drying by baking
Putting the chromium powder obtained in the step S2 into a drying device, drying at 80 ℃ for 0.6h, stirring at the stirring speed of 15r/min during drying, recovering evaporated gasoline during drying, recycling, vacuumizing the drying device at the vacuum degree of 6.5Pa, and airing at the low temperature of 5 ℃ for 25min after drying is finished;
s4: sieving
Classifying and screening the clean chromium powder obtained in the step S3, performing multi-stage screening according to the particle size of the chromium powder, performing intermediate-stage screening to obtain low-grade powder and high-grade powder, subdividing the high-grade chromium powder and the low-grade chromium powder simultaneously, collecting substandard powder in the low-grade powder, repeating the steps S2-S4, introducing the obtained chromium powder into a microwave heating furnace for decarburization treatment at the heating temperature of 550 ℃ for 30min, cooling to room temperature after heating is completed, separating graphite particles to obtain decarburized chromium powder, introducing the decarburized chromium powder into a ceramic container provided with hydrogen plasma radio frequency equipment, reducing and deoxidizing the decarburized chromium powder by using hydrogen as reducing gas, arranging a cooling device in the container, sampling and detecting the decarburized chromium powder, wherein detection items comprise carbon content, oxygen content, color and luster and chemical components, and qualified detected chromium powder, performing bag-dividing vacuum packaging, and then entering a storage link;
nano Al2O3And ZrO2The preparation method of the high-toughness ceramic block prepared by mixing comprises the following steps:
s2-1: mixing nano Al2O3Powder and ZrO2Mixing the powder according to the weight ratio of 1:1, and uniformly mixing in an electromagnetic stirring device to obtain a mixed additive;
s2-2: breaking the porcelain stone to 1cm3Grinding the materials in a grinding device to obtain grinding powder, elutriating the grinding powder, removing impurities, adding the mixed additive obtained in S2-1, wherein the weight ratio of the mixed additive to the grinding powder is 1:20, stirring elutriation liquid, uniformly stirring, precipitating for 24 hours, and filtering precipitate liquid to obtain soft mud blocks;
s2-3: and drying the soft mud blocks to obtain hard mud blocks, cutting the hard mud blocks into a specified size, and firing to obtain the finished high-toughness ceramic blocks.
Example 3:
a method for preparing metal chromium powder by ultra-low temperature grinding comprises the following steps:
s1: crushing
Selecting original chromium blocks, then putting the selected chromium blocks into liquid nitrogen for freezing for 1h, crushing the frozen metal chromium blocks by a crusher, filtering the crushed chromium particles by a screen, wherein the size of the aperture of the screen is 10mm, secondarily crushing the particles left on the screen, and refrigerating the particles passing through the screen;
s2: ultra-low temperature grinding
Placing the refrigerated particles into a grinder, adding grinding medium, introducing protective medium liquid nitrogen, controlling the grinding temperature at 0 deg.C, and performing thin film seed bearing at a flow rate of 10 m/h during grindingThe length of the grinding process is 5 hours, the power of a grinding machine is firstly adjusted to the ball milling revolution number of 100r/min during grinding, the grinding process lasts for 1 hour, then the ball milling revolution number is adjusted to 500r/min, the grinding process is continued to be ground into powder, a grinding medium in the grinding machine is tungsten steel, a lining is made of zirconia, liquid nitrogen is used as temperature control gas during the grinding process, helium is introduced as protective gas, the gas flow is 25m year/h, the ball material ratio is 10:1, the powder obtained after grinding is collected and elutriated by adopting gasoline, the liquid level of the gasoline is higher than that of chromium powder, and nano Al is added during elutriation2O3And ZrO2Mixing the prepared high-toughness ceramic blocks, wherein the particle diameter of each high-toughness ceramic block is 1cm, fishing the ceramic blocks by using a screen after elutriation is finished, filtering out chromium powder by using filter cloth, standing the elutriated gasoline for 18 hours, taking a hose, introducing a supernatant onto industrial anti-static filter cloth by using a siphon principle, collecting a filtrate below the filter cloth by using a barrel, recycling the gasoline after repeating the filtrate for three times, adding a magnet into the chromium powder during elutriation, elutriating by using an electromagnetic stirring mode, and cleaning iron powder on the magnet after elutriation is finished;
s3: drying by baking
Putting the chromium powder obtained in the step S2 into a drying device, drying at 100 ℃ for 0.8h, stirring at the stirring speed of 20r/min during drying, recovering evaporated gasoline during drying, recycling, vacuumizing the drying device at the vacuum degree of 7Pa, and airing at the low temperature of 5 ℃ for 30min after drying;
s4: sieving
Classifying and screening the clean chromium powder obtained in the step S3, performing multi-stage screening according to the particle size of the chromium powder, performing intermediate-stage screening to obtain low-grade powder and high-grade powder, subdividing the high-grade chromium powder and the low-grade chromium powder simultaneously, collecting substandard powder in the low-grade powder, repeating the steps S2-S4, introducing the obtained chromium powder into a microwave heating furnace for decarburization treatment at the heating temperature of 550 ℃ for 30min, cooling to room temperature after heating is completed, separating graphite particles to obtain decarburized chromium powder, introducing the decarburized chromium powder into a ceramic container provided with hydrogen plasma radio frequency equipment, reducing and deoxidizing the decarburized chromium powder by using hydrogen as reducing gas, arranging a cooling device in the container, sampling and detecting the decarburized chromium powder, wherein detection items comprise carbon content, oxygen content, color and luster and chemical components, and qualified detected chromium powder, performing bag-dividing vacuum packaging, and then entering a storage link;
nano Al2O3And ZrO2The preparation method of the high-toughness ceramic block prepared by mixing comprises the following steps:
s2-1: mixing nano Al2O3Powder and ZrO2Mixing the powder according to the weight ratio of 1:1, and uniformly mixing in an electromagnetic stirring device to obtain a mixed additive;
s2-2: breaking the porcelain stone to 1-2cm3Grinding the materials in a grinding device to obtain grinding powder, elutriating the grinding powder, removing impurities, adding the mixed additive obtained in S2-1, wherein the weight ratio of the mixed additive to the grinding powder is 1:20, stirring elutriation liquid, uniformly stirring, precipitating for 24 hours, and filtering precipitate liquid to obtain soft mud blocks;
s2-3: and drying the soft mud blocks to obtain hard mud blocks, cutting the hard mud blocks into a specified size, and firing to obtain the finished high-toughness ceramic blocks.
The chromium powder produced in the three examples was tested using the chromium blocks used in the three examples as the same batch of chromium blocks, and the test results are shown in table 1:
TABLE 1 impurity content of chromium powder produced in three examples
| Examples | Carbon content | Oxygen content | Iron content |
| Example 1 | 0.008% | 0.01% | 0.02% |
| Example 2 | 0.005% | 0.008% | 0.025% |
| Example 3 | 0.003% | 0.005% | 0.01% |
As can be seen from the data in Table 1, the content of impurity elements in the chromium metal powder prepared by the method of the present invention is low, and the comparison of the above experimental data shows that example 2 is the best scheme.
Claims (9)
1. A method for preparing metal chromium powder by ultra-low temperature grinding is characterized by comprising the following steps:
s1: crushing
Selecting original chromium blocks, then putting the selected chromium blocks into liquid nitrogen for freezing for 0.5-1h, crushing the frozen metal chromium blocks by a crusher, filtering the crushed chromium particles by a screen, wherein the aperture of the screen is 10mm, secondarily crushing the particles left on the screen, and refrigerating the particles passing through the screen;
s2: ultra-low temperature grinding
Placing the refrigerated particles into a grinder, adding grinding medium, introducing protective medium liquid nitrogen, controlling the grinding temperature at-150-0 deg.C, controlling the flow rate of liquid nitrogen at 5-10 m/h, grinding for 2-5h, collecting the powder, elutriating with gasoline, wherein the liquid level of gasoline is higher than that of chromium powder, and adding nano Al during elutriation2O3And ZrO2Mixing to obtain high-toughness ceramic blocks, wherein the particle diameter of the high-toughness ceramic blocks is 0.5-1cm, fishing the ceramic blocks by using a screen after the elutriation is finished, and then filtering out chromium powder by using filter cloth;
s3: drying by baking
Putting the chromium powder obtained in the step S2 into a drying device, drying at 60-100 ℃ for 0.5-0.8h, stirring at the stirring speed of 10-20r/min during drying, recovering evaporated gasoline during drying, reusing, vacuumizing the drying device at the vacuum degree of 6-7Pa, and airing at low temperature for 20-30min after drying;
s4: sieving
And (3) grading and screening the clean chromium powder obtained in the step (S3), carrying out multi-stage screening according to the particle size of the chromium powder, carrying out middle-stage screening to obtain low-grade powder and high-grade powder, simultaneously subdividing the high-grade chromium powder and the low-grade chromium powder, collecting powder which does not reach the standard in the low-grade powder, and repeating the steps (S2) -S4).
2. The method for preparing chromium metal powder through ultra-low temperature grinding as claimed in claim 1, wherein in the step S2, the power of the grinder is firstly adjusted to 100r/min for 1h, and then the grinding is continued to be powdered after the grinding ball rotation number is adjusted to 500 r/min.
3. The method for preparing chromium metal powder through ultra-low temperature grinding as claimed in claim 1, wherein the gasoline washed in step S2 is firstly stood for 12-18h, the supernatant is introduced into an industrial antistatic filter cloth by using a hose and using a siphon principle, the filtrate is collected by a barrel below the filter cloth, and after the process is repeated three times, the gasoline is recycled.
4. The method for preparing metallic chromium powder through ultra-low temperature grinding as claimed in claim 1, wherein the chromium powder obtained in S4 is subjected to decarburization treatment in a microwave oven at a temperature of 450-610 ℃ for 30min, and after completion of heating, it is cooled to room temperature, and graphite particles are separated to obtain decarburized chromium powder.
5. The method for preparing metallic chromium powder through ultra-low temperature grinding as claimed in claim 4, wherein the decarburized chromium powder is introduced into a ceramic container equipped with a hydrogen plasma radio frequency device, and the decarburized chromium powder is deoxidized by reduction using hydrogen as a reducing gas, and a cooling device is installed in the container.
6. The method of claim 1, wherein in step S2, the grinding medium in the grinding machine is tungsten steel, the lining is zirconia, liquid nitrogen is used as temperature-controlled gas during grinding, helium is introduced as protective gas, the gas flow is 10-25m top-dressing/h, and the ball-to-material ratio is 10: 1.
7. The method for preparing metallic chromium powder through ultra-low temperature grinding as claimed in claim 5, wherein the chromium powder after deoxidation is sampled and tested, the test items include carbon content, oxygen content, color and chemical composition, and the qualified chromium powder is packaged in bags in vacuum and then enters the storage link.
8. The method for preparing metallic chromium powder through ultra-low temperature grinding as claimed in claim 1, wherein the magnet is added into the chromium powder during elutriation in step S2, the elutriation is performed by means of electromagnetic stirring, and the iron powder on the magnet is cleaned after the elutriation is completed.
9. The method for preparing metallic chromium powder by ultra-low temperature grinding as claimed in claim 1, wherein said nano Al is2O3And ZrO2The preparation method of the high-toughness ceramic block prepared by mixing comprises the following steps:
s2-1: mixing nano Al2O3Powder and ZrO2Mixing the powder according to the weight ratio of 1:1, and uniformly mixing in an electromagnetic stirring device to obtain a mixed additive;
s2-2: breaking the porcelain stone to 1-2cm3Size in the grinding deviceGrinding the materials to obtain grinding powder, elutriating the grinding powder, removing impurities, adding the mixed additive obtained in S2-1, wherein the weight ratio of the mixed additive to the grinding powder is 1:20, stirring the elutriation liquid, uniformly stirring, precipitating for 24 hours, and filtering the precipitation liquid to obtain soft mud blocks;
s2-3: and drying the soft mud blocks to obtain hard mud blocks, cutting the hard mud blocks into a specified size, and firing to obtain the finished high-toughness ceramic blocks.
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