CN113277876A - Preparation method of corundum-mullite light brick - Google Patents
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- C04B38/00—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof
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- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
- C04B35/16—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on silicates other than clay
- C04B35/18—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on silicates other than clay rich in aluminium oxide
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Abstract
The invention relates to the technical field of building production, and discloses a preparation method of a corundum mullite light brick, which comprises the following seven steps: sieving and grinding, stirring uniformly, adding a dispersing agent and a binding agent, adjusting the pH value, preparing a suspension, injection molding, demolding and high-temperature sintering, wherein when the pH value is adjusted, the temperature of the slurry is 40-60 ℃, the pH value of the slurry is 8-10, the demolding drying temperature is 80 ℃, the vibration frequency of a vibrator is 2000 times per minute, the heat preservation temperature during sintering is 1500 ℃, the heat preservation sintering time is 5 hours, the grinding time of a ball mill is 10 minutes, and the diameter of the ground fine particles is less than 1 mm.
Description
Technical Field
The invention relates to the technical field of building production, in particular to a preparation method of a corundum-mullite light brick.
Background
The corundum-mullite brick is a high-alumina refractory product consisting of corundum and mullite main crystal phases. Corundum-mullite brick is a refractory product made of high-purity or purer raw materials. Wherein the presence of low melting point oxide impurities reduces the high temperature performance thereof. The pure mullite raw material synthesized by using industrial alumina powder and pure clay, bauxite or silica as raw materials is adopted, and the content of alkali metal oxide is particularly required to be as low as possible. The product prepared by taking the mullite cis-granule as the aggregate has good thermal shock resistance but poorer erosion resistance, and the product taking the corundum as the aggregate has good corrosion resistance but poorer thermal shock resistance.
The prior preparation method of the corundum-mullite light brick has the following defects: firstly, the particle sizes of the bauxite and the silica fume are not uniform during material mixing, so that the internal structure is not easy to sinter during final sintering, the strength of the product is reduced, secondly, bubbles are easy to appear in suspension after stirring during injection molding, so that the bubbles in the injection molding cannot be well discharged, and large sand holes are easy to appear in the sintering, and the quality of the final product is influenced.
Disclosure of Invention
Technical problem to be solved
Aiming at the defects of the prior art, the invention provides the preparation method of the corundum-mullite light brick, which has the advantages of uniform internal structure and structure, excellent tissue phase, difficult existence of large bubbles and sand holes in the brick during production, improved firmness and capability of solving the problems in the background art.
(II) technical scheme
In order to achieve the purposes of uniform internal structure, excellent tissue phase, difficult existence of large bubbles and sand holes in the interior during production and improvement of firmness, the invention provides the following technical scheme:
the invention aims to solve another technical problem of providing a preparation method of a corundum-mullite light brick, which comprises the following steps:
1) screening and grinding: respectively putting the high-alumina bauxite and the silica fume into a crusher for crushing, then screening through a filter screen with the particle size of 3mm to obtain particles with uniform particle size, and grinding through a ball mill to obtain uniform fine particles.
2) Stirring uniformly: and (3) mixing the sieved and ground high bauxite and silica fume according to the weight ratio of 3: 1, then adding polystyrene balls, and stirring by a high-speed stirrer to fully mix the high-alumina bauxite and the silica fume for 20 minutes.
3) Adding a dispersing agent and a binding agent: the preparation method comprises the steps of taking a polypropylene millamine gel system solution as a binding agent and taking triammonium citrate as a dispersing agent, adding the dispersing agent and part of the binding agent into the uniformly stirred high-alumina bauxite and silica fume, mixing to prepare a premixed solution, stirring to prepare a slurry, and stirring for 1 hour.
4) Adjusting the pH value: and adjusting the pH value of the slurry by adopting hydrochloric acid and ammonia water.
5) Suspension formation: and adding the slurry with the adjusted pH value into the pore-forming agent and the rest of the bonding agent, and stirring for 0.5 hour.
6) Injection molding and demolding: and (3) injecting the suspension into a mold, vibrating the suspension by using a vibrator for 10 minutes, naturally solidifying for 12 hours, demolding, and drying for 12 hours.
7) And (3) high-temperature sintering: the demoulded and dried prefabricated product is put into a sintering furnace for sintering, the sintering temperature is controlled at 1000℃ -1600 DEG C
Preferably, in the step 4, when the pH value is adjusted, the temperature of the slurry is 40-60 ℃, and the pH value of the slurry is 8-10.
Preferably, the demolding drying temperature in the step 6 is set at 80 ℃, and the vibration frequency of the vibrator is set at 2000 times per minute.
Preferably, the heat preservation temperature during the sintering in the step 7 is set to be 1500 ℃, and the heat preservation sintering time is 5 hours.
Preferably, the milling time of the ball mill in the step 1 is 10 minutes, and the diameter of the fine particles after milling is less than 1 mm.
(III) advantageous effects
Compared with the prior art, the invention provides a preparation method of a corundum-mullite light brick, which has the following beneficial effects:
1. according to the preparation method of the corundum-mullite light brick, through the arrangement of screening and grinding, high bauxite and silica fume are firstly crushed and screened by a crusher during use, then the high bauxite and the silica fume are ground to obtain uniform particles, a structure with stable phase can be obtained in subsequent high-temperature sintering, the quality of the corundum-mullite light brick is prevented from being reduced due to the fact that the particles are not uniform, and the purpose of improving the quality of the corundum-mullite light brick is achieved.
2. According to the preparation method of the corundum-mullite light brick, through the arrangement of the vibrator, when the brick is used, the suspension in the mould is subjected to bubble removal and the pore-forming agent in the slurry is subjected to more uniform mixing through the vibrator during injection molding, so that the problem that bubbles exist inside the brick during injection molding, the sintering quality of subsequent sintering is influenced, the rejection rate is increased, and the production efficiency and the production quality are improved is solved.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The first embodiment is as follows: a preparation method of a corundum-mullite light brick comprises the following steps:
step 1: screening and grinding: respectively putting the high-alumina bauxite and the silica fume into a crusher for crushing, then screening through a filter screen with the particle size of 3mm to obtain particles with uniform particle size, and grinding through a ball mill to obtain uniform fine particles.
Step 2: stirring uniformly: and (3) mixing the sieved and ground high bauxite and silica fume according to the weight ratio of 3: 1, then adding polystyrene balls, and stirring by a high-speed stirrer to fully mix the high-alumina bauxite and the silica fume for 20 minutes.
And step 3: adding a dispersing agent and a binding agent: the preparation method comprises the steps of taking a polypropylene millamine gel system solution as a binding agent and taking triammonium citrate as a dispersing agent, adding the dispersing agent and part of the binding agent into the uniformly stirred high-alumina bauxite and silica fume, mixing to prepare a premixed solution, stirring to prepare a slurry, and stirring for 1 hour.
And 4, step 4: adjusting the pH value: and adjusting the pH value of the slurry by adopting hydrochloric acid and ammonia water.
And 5: suspension formation: and adding the slurry with the adjusted pH value into the pore-forming agent and the rest of the bonding agent, and stirring for 0.5 hour.
Step 6: injection molding and demolding: and (3) injecting the suspension into a mold, vibrating the suspension by using a vibrator for 10 minutes, naturally solidifying for 12 hours, demolding, and drying for 12 hours.
And 7: and (3) high-temperature sintering: and putting the demoulded and dried preform into a sintering furnace for sintering, wherein the sintering temperature is controlled to be 1000-1600 ℃.
In the step 4, when the pH value is adjusted, the temperature of the slurry is 50 ℃, and the pH value of the slurry is 8.
In step 6, the demolding and drying temperature is set at 80 ℃, and the vibration frequency of the vibrator is set at 2000 times per minute.
And 7, setting the heat preservation temperature to be 1500 ℃ during sintering, and setting the heat preservation sintering time to be 5 hours.
And (3) grinding for 10 minutes by using a ball mill in the step 1, wherein the diameter of the ground fine particles is less than 1 mm.
In this example, the prepared corundum-mullite lightweight brick has a density of 0.37 g/cc, a porosity of 87.37%, and a strength of 2.17 mpa.
Example two: a preparation method of a corundum-mullite light brick comprises the following steps:
step 1: screening and grinding: respectively putting the high-alumina bauxite and the silica fume into a crusher for crushing, then screening through a filter screen with the particle size of 3mm to obtain particles with uniform particle size, and grinding through a ball mill to obtain uniform fine particles.
Step 2: stirring uniformly: and (3) mixing the sieved and ground high bauxite and silica fume according to the weight ratio of 3: 1, then adding polystyrene balls, and stirring by a high-speed stirrer to fully mix the high-alumina bauxite and the silica fume for 20 minutes.
And step 3: adding a dispersing agent and a binding agent: the preparation method comprises the steps of taking a polypropylene millamine gel system solution as a binding agent and taking triammonium citrate as a dispersing agent, adding the dispersing agent and part of the binding agent into the uniformly stirred high-alumina bauxite and silica fume, mixing to prepare a premixed solution, stirring to prepare a slurry, and stirring for 1 hour.
And 4, step 4: adjusting the pH value: and adjusting the pH value of the slurry by adopting hydrochloric acid and ammonia water.
And 5: suspension formation: and adding the slurry with the adjusted pH value into the pore-forming agent and the rest of the bonding agent, and stirring for 0.5 hour.
Step 6: injection molding and demolding: and (3) injecting the suspension into a mold, vibrating the suspension by using a vibrator for 10 minutes, naturally solidifying for 12 hours, demolding, and drying for 12 hours.
And 7: and (3) high-temperature sintering: and putting the demoulded and dried preform into a sintering furnace for sintering, wherein the sintering temperature is controlled to be 1000-1600 ℃.
In the step 4, when the pH value is adjusted, the temperature of the slurry is 50 ℃, and the pH value of the slurry is 9.
In step 6, the demolding and drying temperature is set at 80 ℃, and the vibration frequency of the vibrator is set at 2000 times per minute.
And 7, setting the heat preservation temperature to be 1500 ℃ during sintering, and setting the heat preservation sintering time to be 5 hours.
And (3) grinding for 10 minutes by using a ball mill in the step 1, wherein the diameter of the ground fine particles is less than 1 mm.
In this example, the prepared corundum-mullite lightweight brick has a density of 0.4 g/cc, a porosity of 90.37%, and a strength of 2.38 mpa.
Example three: a preparation method of a corundum-mullite light brick comprises the following steps:
step 1: screening and grinding: respectively putting the high-alumina bauxite and the silica fume into a crusher for crushing, then screening through a filter screen with the particle size of 3mm to obtain particles with uniform particle size, and grinding through a ball mill to obtain uniform fine particles.
Step 2: stirring uniformly: and (3) mixing the sieved and ground high bauxite and silica fume according to the weight ratio of 3: 1, then adding polystyrene balls, and stirring by a high-speed stirrer to fully mix the high-alumina bauxite and the silica fume for 20 minutes.
And step 3: adding a dispersing agent and a binding agent: the preparation method comprises the steps of taking a polypropylene millamine gel system solution as a binding agent and taking triammonium citrate as a dispersing agent, adding the dispersing agent and part of the binding agent into the uniformly stirred high-alumina bauxite and silica fume, mixing to prepare a premixed solution, stirring to prepare a slurry, and stirring for 1 hour.
And 4, step 4: adjusting the pH value: and adjusting the pH value of the slurry by adopting hydrochloric acid and ammonia water.
And 5: suspension formation: and adding the slurry with the adjusted pH value into the pore-forming agent and the rest of the bonding agent, and stirring for 0.5 hour.
Step 6: injection molding and demolding: and (3) injecting the suspension into a mold, vibrating the suspension by using a vibrator for 10 minutes, naturally solidifying for 12 hours, demolding, and drying for 12 hours.
And 7: and (3) high-temperature sintering: and putting the demoulded and dried preform into a sintering furnace for sintering, wherein the sintering temperature is controlled to be 1000-1600 ℃.
In the step 4, when the pH value is adjusted, the temperature of the slurry is 50 ℃, and the pH value of the slurry is 10.
In step 6, the demolding and drying temperature is set at 80 ℃, and the vibration frequency of the vibrator is set at 2000 times per minute.
And 7, setting the heat preservation temperature to be 1500 ℃ during sintering, and setting the heat preservation sintering time to be 5 hours.
And (3) grinding for 10 minutes by using a ball mill in the step 1, wherein the diameter of the ground fine particles is less than 1 mm.
In this example, the prepared corundum-mullite lightweight brick has a density of 0.39 g/cc, a porosity of 88.37%, and a strength of 2.26 mpa.
And (4) judging the standard: and 4, when the pH value is adjusted in the step 4, the temperature of the slurry is 50 ℃, and the quality of the prepared corundum-mullite light brick is the highest quality when the pH value of the slurry is 9.
The invention has the beneficial effects that: the preparation method of the corundum-mullite light brick comprises the steps of screening and grinding, wherein high-alumina and silica fume are firstly crushed and screened by a crusher during use, then the high-alumina and the silica fume are ground to obtain uniform particles, a phase-stable structure can be obtained during subsequent high-temperature sintering, the quality of the corundum-mullite light brick is prevented from being reduced due to nonuniform particles, the purpose of improving the quality of the corundum-mullite light brick is achieved, through the arrangement of a vibrator, when the corundum-mullite light brick is used, a suspension in a die is subjected to bubble removal and more uniform mixing of a pore-forming agent in slurry is carried out through the vibrator during injection molding, the situation that bubbles exist inside the corundum-mullite light brick during injection molding, the sintering quality of subsequent sintering is influenced, the rejection rate is increased, and the production efficiency and the production quality are improved is achieved
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (5)
1. A preparation method of corundum-mullite light brick is characterized by comprising the following steps: the method comprises the following steps:
1) screening and grinding: respectively putting the high-alumina bauxite and the silica fume into a crusher for crushing, then screening through a filter screen with the particle size of 3mm to obtain particles with uniform particle size, and grinding through a ball mill to obtain uniform fine particles.
2) Stirring uniformly: and (3) mixing the sieved and ground high bauxite and silica fume according to the weight ratio of 3: 1, then adding polystyrene balls, and stirring by a high-speed stirrer to fully mix the high-alumina bauxite and the silica fume for 20 minutes.
3) Adding a dispersing agent and a binding agent: the preparation method comprises the steps of taking a polypropylene millamine gel system solution as a binding agent and taking triammonium citrate as a dispersing agent, adding the dispersing agent and part of the binding agent into the uniformly stirred high-alumina bauxite and silica fume, mixing to prepare a premixed solution, stirring to prepare a slurry, and stirring for 1 hour.
4) Adjusting the pH value: and adjusting the pH value of the slurry by adopting hydrochloric acid and ammonia water.
5) Suspension formation: and adding the slurry with the adjusted pH value into the pore-forming agent and the rest of the bonding agent, and stirring for 0.5 hour.
6) Injection molding and demolding: and (3) injecting the suspension into a mold, vibrating the suspension by using a vibrator for 10 minutes, naturally solidifying for 12 hours, demolding, and drying for 12 hours.
7) And (3) high-temperature sintering: and putting the demoulded and dried preform into a sintering furnace for sintering, wherein the sintering temperature is controlled to be 1000-1600 ℃.
2. The method for preparing the corundum-mullite light brick according to claim 1, which is characterized in that: in the step 4, when the pH value is adjusted, the temperature of the slurry is 40-60 ℃, and the pH value of the slurry is 8-10.
3. The method for preparing the corundum-mullite light brick according to claim 1, which is characterized in that: in the step 6, the demolding and drying temperature is set at 80 ℃, and the vibration frequency of the vibrator is set at 2000 times per minute.
4. The method for preparing the corundum-mullite light brick according to claim 1, which is characterized in that: and 7, setting the heat preservation temperature to be 1500 ℃ and the heat preservation sintering time to be 5 hours during sintering.
5. The method for preparing the corundum-mullite light brick according to claim 1, which is characterized in that: and (3) grinding for 10 minutes by using a ball mill in the step 1, wherein the diameter of the ground fine particles is less than 1 mm.
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Application publication date: 20210820 |