CN111285698A - Method for manufacturing low-heat-conductivity refractory castable - Google Patents
Method for manufacturing low-heat-conductivity refractory castable Download PDFInfo
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- CN111285698A CN111285698A CN202010271992.7A CN202010271992A CN111285698A CN 111285698 A CN111285698 A CN 111285698A CN 202010271992 A CN202010271992 A CN 202010271992A CN 111285698 A CN111285698 A CN 111285698A
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/66—Monolithic refractories or refractory mortars, including those whether or not containing clay
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Abstract
The invention relates to the technical field of refractory materials, in particular to a method for manufacturing a low-heat-conductivity refractory castable, which comprises the following steps: crushing each large raw material into crushed materials of 0.5-1cm by a jaw crusher, crushing by a cone crusher, and sieving by a sieve of 50-100 meshes to obtain fine powder; weighing bauxite aggregate, brown corundum, white corundum, refractory cement, silicon powder and metal oxide according to the weight parts, and mixing to obtain a mixture a; weighing glass fiber, asbestos, rock wool and silicate in parts by weight, and mixing to obtain a mixture b; placing the mixture a and the mixture b in a stirrer, uniformly mixing, adding water and the auxiliary agent according to the weight part ratio, and mixing for 20-30 min; drying the treated materials at 40-60 deg.C until the water content is 0.03-0.1%; preparing the treated material into a low-heat-conductivity refractory castable by adopting a stepped baking mode; the castable prepared by the method has good fireproof performance, and keeps good pressure resistance and wear resistance.
Description
Technical Field
The invention relates to the technical field of refractory materials, in particular to a method for manufacturing a low-heat-conductivity refractory castable.
Background
The castable is a basic material serving high-temperature technology, is also called refractory castable, is a granular or powdery material prepared by adding a certain amount of bonding agent into refractory materials, has high fluidity and is an unshaped refractory material molded by a pouring mode. The production process of the castable is an important index for measuring the technical level and the production level of a refractory material manufacturer, and the level of the production process also relates to the product quality of the castable.
The existing Chinese patent is a preparation method (2018109666105) of a refractory castable, and the refractory castable comprises the following raw materials in parts by weight: 55-78 parts of brown corundum, 12-19 parts of cyanite powder, 2-7 parts of barite powder, 5-11.5 parts of calcium aluminate cement, 3-8.5 parts of calcium sulfate, 2-9.5 parts of calcium fluoride, 1.5-4.5 parts of anti-seepage auxiliary agent, 4.5-9 parts of explosion-proof fiber, 1.5-4 parts of dispersing agent, 6-14 parts of sodium silicate, 2.5-7.5 parts of potassium silicate and 0.1-0.5 part of rare earth; during preparation, according to the weight ratio, firstly, the brown corundum, the calcium sulfate, the calcium fluoride and the anti-seepage auxiliary agent are co-ground in a vibration mill for 40-60 min; obtaining homogenized powder, mixing the homogenized powder with other components, and uniformly mixing to obtain the refractory castable. The refractory castable material obtained by the invention has excellent anti-seepage performance.
The existing castable in the market generally has the defects of low wear resistance, poor high temperature resistance and the like, so that the service life of the castable product is poor, and the market requirement is difficult to meet.
Disclosure of Invention
In view of the above, the invention provides a method for manufacturing a low-thermal-conductivity refractory castable, which adopts a proper amount of bauxite aggregate, brown fused alumina, white fused alumina, refractory cement, silicon powder and metal oxide as main raw materials, so that the prepared castable has good refractory performance, and simultaneously keeps good pressure resistance and wear resistance.
In order to achieve the purpose, the invention adopts the following technical scheme:
a method for manufacturing a low-thermal-conductivity refractory castable comprises the following steps:
step 1: crushing each large raw material into crushed materials of 0.5-1cm by a jaw crusher, crushing by a cone crusher, and sieving by a sieve of 50-100 meshes to obtain fine powder;
step 2: weighing bauxite aggregate, brown corundum, white corundum, refractory cement, silicon powder and metal oxide according to the weight parts, and mixing to obtain a mixture a;
and step 3: weighing glass fiber, asbestos, rock wool and silicate in parts by weight, and mixing to obtain a mixture b;
and 4, step 4: placing the mixture a and the mixture b in a stirrer, uniformly mixing, adding water and the auxiliary agent according to the weight part ratio, and mixing for 20-30 min;
and 5: drying the material treated in the step 4 at 40-60 ℃ until the water content is 0.03-0.1%;
step 6: and (5) preparing the low-heat-conductivity refractory castable from the material treated in the step-type baking mode.
Preferably, in step 2, the following components are weighed in parts by weight: 30-45 parts of bauxite aggregate, 10-15 parts of brown fused alumina, 10-15 parts of white fused alumina, 10-20 parts of refractory cement, 8-12 parts of silicon powder and 6-10 parts of metal oxide.
Preferably, in step 2, the following components are weighed in parts by weight: 40 parts of bauxite aggregate, 12 parts of brown fused alumina, 12 parts of white fused alumina, 15 parts of refractory cement, 10 parts of silicon powder and 8 parts of metal oxide.
Preferably, in step 3, the following components are weighed in parts by weight: 8-12 parts of glass fiber, 6-8 parts of asbestos, 5-7 parts of rock wool and 5-10 parts of silicate.
Preferably, in step 3, the following components are weighed in parts by weight: 10 parts of glass fiber, 6 parts of asbestos, 6 parts of rock wool and 8 parts of silicate.
Preferably, in step 4, the mixture a and the mixture b are placed in a stirrer at the rotation speed of 500-800r/min and kept for 5-8min, 40-70 parts of water and 10-30 parts of auxiliary agent are added, and the rotation speed of the stirrer is set at 1000-1200r/min and kept for 25-30 min.
Preferably, in step 4, the mixture a and the mixture b are placed in a stirrer at a rotating speed of 600r/min for 6min, 55 parts of water and 15 parts of auxiliary agents are added, and the rotating speed of the stirrer is set at 1000r/min for 25 min.
Preferably, in step 5, the material is dried at 45 ℃ to a moisture content of 0.05%.
Preferably, in step 6, the material is baked for 24-40h at 80-110 ℃, then the temperature is raised to 150-.
Preferably, in step 6, the material is baked at 90 ℃ for 30h, then the temperature is raised to 250 ℃ for 40h, and finally the temperature is raised to 900 ℃ for 40h, so as to prepare the invention.
Compared with the prior art, the invention has the beneficial effects that: the invention adopts proper amount of bauxite aggregate, brown corundum, white corundum, refractory cement, silicon powder and metal oxide as main raw materials, so that the prepared castable has good refractory performance, and simultaneously keeps good pressure resistance and wear resistance.
Detailed Description
The technical solutions in the present invention will be described clearly and completely with reference to the following embodiments, and it should be understood 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.
Example 1
A method for manufacturing a low-thermal-conductivity refractory castable comprises the following steps:
step 1: crushing each large raw material into crushed materials of 0.5-1cm by a jaw crusher, crushing by a cone crusher, and sieving by a sieve of 50-100 meshes to obtain fine powder;
step 2: weighing bauxite aggregate, brown corundum, white corundum, refractory cement, silicon powder and metal oxide according to the weight parts, and mixing to obtain a mixture a;
and step 3: weighing glass fiber, asbestos, rock wool and silicate in parts by weight, and mixing to obtain a mixture b;
and 4, step 4: placing the mixture a and the mixture b in a stirrer, uniformly mixing, adding water and the auxiliary agent according to the weight part ratio, and mixing for 20-30 min;
and 5: drying the material treated in the step 4 at 40-60 ℃ until the water content is 0.03-0.1%;
step 6: and (5) preparing the low-heat-conductivity refractory castable from the material treated in the step-type baking mode.
In example 1, in step 2, the following were weighed in parts by weight: 40 parts of bauxite aggregate, 12 parts of brown fused alumina, 12 parts of white fused alumina, 15 parts of refractory cement, 10 parts of silicon powder and 8 parts of metal oxide.
In example 1, in step 3, the following were weighed in parts by weight: 10 parts of glass fiber, 6 parts of asbestos, 6 parts of rock wool and 8 parts of silicate.
In example 1, in step 4, the mixture a and the mixture b were placed in a mixer at a rotation speed of 600r/min for 6min, 55 parts of water and 15 parts of auxiliary were added, and the mixer at a rotation speed of 1000r/min for 25 min.
In example 1, in step 5, the batch was oven dried at 45 ℃ to a moisture content of 0.05%.
In example 1, the invention was prepared by baking the material at 90 ℃ for 30h, then raising the temperature to 250 ℃ for 40h, and finally raising the temperature to 900 ℃ for 40h in step 6.
Example 2
A method for manufacturing a low-thermal-conductivity refractory castable comprises the following steps:
step 1: crushing each large raw material into crushed materials of 0.5-1cm by a jaw crusher, crushing by a cone crusher, and sieving by a sieve of 50-100 meshes to obtain fine powder;
step 2: weighing bauxite aggregate, brown corundum, white corundum, refractory cement, silicon powder and metal oxide according to the weight parts, and mixing to obtain a mixture a;
and step 3: weighing glass fiber, asbestos, rock wool and silicate in parts by weight, and mixing to obtain a mixture b;
and 4, step 4: placing the mixture a and the mixture b in a stirrer, uniformly mixing, adding water and the auxiliary agent according to the weight part ratio, and mixing for 20-30 min;
and 5: drying the material treated in the step 4 at 40-60 ℃ until the water content is 0.03-0.1%;
step 6: and (5) preparing the low-heat-conductivity refractory castable from the material treated in the step-type baking mode.
In step 2 of example 2, the following components are weighed in parts by weight: 35 parts of bauxite aggregate, 10 parts of brown fused alumina, 10 parts of white fused alumina, 12 parts of refractory cement, 8 parts of silicon powder and 6 parts of metal oxide.
In step 3 of example 2, the following components are weighed in parts by weight: 8 parts of glass fiber, 6 parts of asbestos, 5 parts of rock wool and 5 parts of silicate.
In step 4 of example 2, the mixture a and the mixture b were placed in a mixer at a rotation speed of 500r/min for 8min, 45 parts of water and 10 parts of an auxiliary were added, and the mixer at a rotation speed of 1100r/min for 30 min.
In example 2, step 5, the batch was oven dried at 40 ℃ to a moisture content of 0.07%.
In step 6 of example 2, the material was baked at 80 ℃ for 35 hours, then the temperature was raised to 200 ℃ for 50 hours, and finally the temperature was raised to 900 ℃ for 40 hours to obtain the present invention.
Example 3
A method for manufacturing a low-thermal-conductivity refractory castable comprises the following steps:
step 1: crushing each large raw material into crushed materials of 0.5-1cm by a jaw crusher, crushing by a cone crusher, and sieving by a sieve of 50-100 meshes to obtain fine powder;
step 2: weighing bauxite aggregate, brown corundum, white corundum, refractory cement, silicon powder and metal oxide according to the weight parts, and mixing to obtain a mixture a;
and step 3: weighing glass fiber, asbestos, rock wool and silicate in parts by weight, and mixing to obtain a mixture b;
and 4, step 4: placing the mixture a and the mixture b in a stirrer, uniformly mixing, adding water and the auxiliary agent according to the weight part ratio, and mixing for 20-30 min;
and 5: drying the material treated in the step 4 at 40-60 ℃ until the water content is 0.03-0.1%;
step 6: and (5) preparing the low-heat-conductivity refractory castable from the material treated in the step-type baking mode.
In step 2 of example 3, the following components are weighed in parts by weight: 45 parts of bauxite aggregate, 15 parts of brown fused alumina, 15 parts of white fused alumina, 20 parts of refractory cement, 10 parts of silicon powder and 10 parts of metal oxide.
In step 3 of example 3, the following components were weighed in parts by weight: 12 parts of glass fiber, 8 parts of asbestos, 7 parts of rock wool and 10 parts of silicate.
In example 3, step 4, the mixture a and the mixture b were placed in a mixer at a rotation speed of 800r/min for 5min, 60 parts of water and 25 parts of an auxiliary were added, and the mixer at a rotation speed of 1200r/min for 25 min.
In example 3, step 5, the batch was dried at 60 ℃ to a moisture content of 0.03%.
In step 6 of example 3, the material was baked at 110 ℃ for 35 hours, then baked at 350 ℃ for 40 hours, and finally baked at 1000 ℃ for 45 hours to obtain the present invention.
Finally, it should be noted that the above-mentioned preferred embodiments of the present invention are provided merely to help illustrate the present invention. The preferred embodiments are not intended to be exhaustive or to limit the invention to the precise embodiments disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best utilize the invention. The invention is limited only by the claims and their full scope and equivalents.
Claims (10)
1. A method for manufacturing a low-heat-conductivity refractory castable is characterized by comprising the following steps:
step 1: crushing each large raw material into crushed materials of 0.5-1cm by a jaw crusher, crushing by a cone crusher, and sieving by a sieve of 50-100 meshes to obtain fine powder;
step 2: weighing bauxite aggregate, brown corundum, white corundum, refractory cement, silicon powder and metal oxide according to the weight parts, and mixing to obtain a mixture a;
and step 3: weighing glass fiber, asbestos, rock wool and silicate in parts by weight, and mixing to obtain a mixture b;
and 4, step 4: placing the mixture a and the mixture b in a stirrer, uniformly mixing, adding water and the auxiliary agent according to the weight part ratio, and mixing for 20-30 min;
and 5: drying the material treated in the step 4 at 40-60 ℃ until the water content is 0.03-0.1%;
step 6: and (5) preparing the low-heat-conductivity refractory castable from the material treated in the step-type baking mode.
2. The method for manufacturing the low-thermal-conductivity refractory castable material according to claim 1, wherein in the step 2, the following components are weighed according to parts by weight: 30-45 parts of bauxite aggregate, 10-15 parts of brown fused alumina, 10-15 parts of white fused alumina, 10-20 parts of refractory cement, 8-12 parts of silicon powder and 6-10 parts of metal oxide.
3. The method for manufacturing the low-thermal-conductivity refractory castable material according to claim 1, wherein in the step 2, the following components are weighed according to parts by weight: 40 parts of bauxite aggregate, 12 parts of brown fused alumina, 12 parts of white fused alumina, 15 parts of refractory cement, 10 parts of silicon powder and 8 parts of metal oxide.
4. The method for manufacturing the low-thermal-conductivity refractory castable material according to claim 1, wherein in the step 3, the following components are weighed according to parts by weight: 8-12 parts of glass fiber, 6-8 parts of asbestos, 5-7 parts of rock wool and 5-10 parts of silicate.
5. The method for manufacturing the low-thermal-conductivity refractory castable material according to claim 1, wherein in the step 3, the following components are weighed according to parts by weight: 10 parts of glass fiber, 6 parts of asbestos, 6 parts of rock wool and 8 parts of silicate.
6. The method as claimed in claim 1, wherein in step 4, the mixture a and the mixture b are placed in a stirrer at a rotation speed of 500-800r/min for 5-8min, 40-70 parts of water and 10-30 parts of assistant are added, and the rotation speed of the stirrer is set at 1000-1200r/min for 25-30 min.
7. The method for manufacturing the refractory castable with low thermal conductivity according to claim 1, wherein in step 4, the mixture a and the mixture b are placed in a stirrer, the rotating speed is set to 600r/min and kept for 6min, 55 parts of water and 15 parts of auxiliary agents are added, and the rotating speed of the stirrer is set to 1000r/min and kept for 25 min.
8. The method for manufacturing the refractory castable material with low thermal conductivity according to claim 1, wherein in step 5, the material is dried at 45 ℃ until the water content is 0.05%.
9. The method as claimed in claim 1, wherein in step 6, the material is baked at 80-110 ℃ for 24-40h, then the temperature is raised to 150-.
10. The method for manufacturing the refractory castable material with low thermal conductivity according to claim 1, wherein in step 6, the material is baked for 30 hours at 90 ℃, then the temperature is raised to 250 ℃ for baking for 40 hours, and finally the temperature is raised to 900 ℃ for baking for 40 hours, so that the invention is prepared.
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