CN111393176A - Production method of novel composite corundum brick for blast furnace - Google Patents
Production method of novel composite corundum brick for blast furnace Download PDFInfo
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Abstract
The invention relates to the field of refractory materials, in particular to a production method of a novel composite corundum brick for a blast furnace, which comprises the following steps: crushing and screening the raw materials to pass through a sieve with 100 meshes and 200 meshes; weighing brown corundum, silicon carbide, white corundum, mullite, alumina, chromium oxide, Guangxi white mud and pine needle soil according to the weight parts, and mixing to obtain a mixture a; uniformly stirring the mixture a by using a mixer, feeding the mixture into a wet mill, adding water, an adhesive and an auxiliary agent according to the weight part, and treating for 20-35 min; the treated material is pressed and molded by a pressure molding machine with the density of 2-5g/cm and the pressure of 250-350t3Then sending the mixture into a dryer, setting the drying temperature to be 80-110 ℃, and drying for 1-3 h; the molded material is sent into a roasting furnace to be roasted for 8-15h, wherein the roasting temperature is 1200-2000 ℃, and a finished product is obtained; the finished product has high strength, high temperature resistance, strong corrosion resistance and long service life.
Description
Technical Field
The invention relates to the field of refractory materials, in particular to a production method of a novel composite corundum brick for a blast furnace.
Background
The corundum brick is a refractory product with alumina content higher than 90% and corundum as main crystal phase. It is divided into two types of sintered corundum bricks and fused corundum bricks. Sintered alumina and fused corundum can be respectively used as raw materials or alumina clinker with high Al2O3/SiO2 ratio is matched with the sintered alumina to prepare the aluminum-based composite material by adopting a sintering method. The unburned corundum brick can also be made by phosphoric acid or other adhesives. The method is mainly used for iron-making blast furnaces and blast furnace hot blast furnaces, external refining furnaces of steel-making furnaces, sliding water heaters, glass melting furnaces, petrochemical industrial furnaces and the like.
Corundum bricks are widely applied to petrochemical heat equipment with serious high temperature, high pressure, chemical erosion and mechanical abrasion as lining materials, and along with the progress of production technology in the petrochemical industry, a plurality of new processes and new technologies are adopted in production, so that the equipment achieves the purposes of large load, long period, low energy consumption and low cost, and higher requirements are provided for the lining materials of various thermal equipment besides the improvement of various thermal equipment.
The low-porosity in-situ corundum brick of the prior Chinese patent and a preparation method (201010030206.0) thereof are prepared from raw materials of alumina aggregate, alumina ultrafine powder, homogenized and activated high-purity alumina ultrafine powder, active SiO2 powder, boric acid, orthophosphoric acid solution and soft clay. The method comprises the steps of preparing materials according to the proportion of the low-pore in-situ corundum brick, fully mixing the prepared materials in sequence to prepare pug and ageing, pressing the pug into a green brick after ageing, drying, calcining the dried green brick, naturally cooling after calcining, and taking out of a kiln to obtain the low-pore in-situ corundum brick. The low-pore in-situ corundum brick has low porosity, higher compressive strength, higher refractoriness under load, good wear resistance, and good acid and alkali erosion resistance. Compared with other corundum bricks, the corundum brick has the advantages of low cost and energy conservation, and can save 40% of capital under the same condition. Therefore, the product of the invention is scientific and technological power for promoting energy conservation and consumption reduction.
The prior art continuously enriches the formula and the production process of the corundum brick according to the application scene of the corundum brick, and the invention aims to invent the composite corundum brick for the blast furnace to meet the actual requirement.
Disclosure of Invention
In view of the above, the invention provides a production method of a novel composite corundum brick for a blast furnace, the corundum brick provided by the invention takes brown corundum, silicon carbide, white corundum, mullite, alumina, chromium oxide, Guangxi white mud and pine needle soil as main raw materials, and the finished product has the advantages of high strength, high temperature resistance, strong corrosion resistance and long service life.
In order to achieve the purpose, the invention adopts the following technical scheme:
the production method of the novel composite corundum brick for the blast furnace comprises the following steps:
step 1: crushing and screening the raw materials to pass through a sieve with 100 meshes and 200 meshes;
step 2, weighing brown corundum, silicon carbide, white corundum, mullite, alumina, chromium oxide, Guangxi white mud and pine needle soil according to the parts by weight, and mixing to obtain a mixture a;
and step 3: uniformly stirring the mixture a by using a mixer, feeding the mixture into a wet mill, adding water, an adhesive and an auxiliary agent according to the weight part, and treating for 20-35 min;
and 4, step 4: pressing and molding the material treated in the step 3 by a pressure molding machine of 250-350t, wherein the density is 2-5g/cm3Then sending the mixture into a dryer, setting the drying temperature to be 80-110 ℃, and drying for 1-3 h;
and 5, feeding the molded material into a roasting furnace for roasting for 8-15h at the roasting temperature of 1200-2000 ℃ to obtain a finished product.
Preferably, in step 1, each raw material is passed through a 150 mesh screen by crushing and screening.
Preferably, in step 2, the following components are weighed in parts by weight: 20-30 parts of brown fused alumina, 6-10 parts of silicon carbide, 10-20 parts of white fused alumina, 8-15 parts of mullite, 5-10 parts of alumina, 4-7 parts of chromium oxide, 15-25 parts of Guangxi white mud and 10-15 parts of pine needle soil.
Preferably, in step 2, the following components are weighed in parts by weight: 25 parts of brown corundum, 8 parts of silicon carbide, 15 parts of white corundum, 12 parts of mullite, 7 parts of alumina, 5 parts of chromium oxide, 20 parts of Guangxi white mud and 13 parts of pine needle soil.
Preferably, in step 3, when the mixture is fed into a wet mill, the feed granularity is 20-30mm, the rotating speed is 15-30 r/min, the power is 10-25KW, the weight of the mill is 7-17t, and the treatment is carried out for 25-35 min.
Preferably, in step 3, when the mixture is fed into a wet mill, the feed particle size is 25mm, the rotating speed is 25 rpm, the power is 15.5KW, the weight of the mill is 12t, and the treatment is carried out for 30 min.
Preferably, in step 3, the following are added in parts by weight: 30-50 parts of water, 20-40 parts of adhesive and 8-15 parts of auxiliary agent; wherein the auxiliary agent is a plasticizer and a bonding agent.
Preferably, in step 3, the following are added in parts by weight: 40 parts of water, 30 parts of adhesive and 10 parts of auxiliary agent.
Preferably, in step 4, the material processed in step 3 is molded by a 300t press molding machinePress molding with density of 3g/cm3And then the mixture is sent into a dryer, the drying temperature is set to be 90 ℃, and the drying treatment is carried out for 2.5 h.
Preferably, in step 5, the formed material is fed into a roasting furnace to be roasted for 12h, wherein the roasting temperature is 1800 ℃.
Compared with the prior art, the invention has the beneficial effects that: the corundum brick provided by the invention takes brown corundum, silicon carbide, white corundum, mullite, alumina, chromium oxide, Guangxi white mud and pine needle soil as main raw materials, the finished product has high strength, high temperature resistance, strong corrosion resistance and long service life, air among material particles can be well removed by using a wet mill during preparation, so that the mixed pug has uniform moisture, full particle surface wetting and good mulling effect, and the aims of balanced moisture, uniform proportioning and low gas content are achieved after rolling is repeatedly carried out, and the product performance is improved.
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
The production method of the novel composite corundum brick for the blast furnace comprises the following steps:
step 1: crushing and screening the raw materials to pass through a sieve with 100 meshes and 200 meshes;
step 2, weighing brown corundum, silicon carbide, white corundum, mullite, alumina, chromium oxide, Guangxi white mud and pine needle soil according to the parts by weight, and mixing to obtain a mixture a;
and step 3: uniformly stirring the mixture a by using a mixer, feeding the mixture into a wet mill, adding water, an adhesive and an auxiliary agent according to the weight part, and treating for 20-35 min;
and 4, step 4: pressing and molding the material treated in the step 3 by a pressure molding machine of 250-350t, wherein the density is 2-5g/cm3Then sent into a dryer to set the drying temperatureDrying at 80-110 deg.C for 1-3 h;
and 5, feeding the molded material into a roasting furnace for roasting for 8-15h at the roasting temperature of 1200-2000 ℃ to obtain a finished product.
In example 1, step 1, each material was ground and sieved through a 150 mesh sieve.
In step 2 of example 1, the following components are weighed in parts by weight: 25 parts of brown corundum, 8 parts of silicon carbide, 15 parts of white corundum, 12 parts of mullite, 7 parts of alumina, 5 parts of chromium oxide, 20 parts of Guangxi white mud and 13 parts of pine needle soil.
In step 3 of example 1, the feed particle size was 25mm, the rotational speed was 25 rpm, the power was 15.5KW, the weight was 12t, and the treatment was 30min when the feed was fed to the wet mill.
In step 3 of example 1, the following were added in parts by weight: 40 parts of water, 30 parts of adhesive and 10 parts of auxiliary agent.
In step 4 of example 1, the material treated in step 3 was press-molded by a 300t press molding machine to have a density of 3g/cm3And then the mixture is sent into a dryer, the drying temperature is set to be 90 ℃, and the drying treatment is carried out for 2.5 h.
In step 5 of example 1, the molded material was fired in a firing furnace at 1800 ℃ for 12 hours.
Example 2
The production method of the novel composite corundum brick for the blast furnace comprises the following steps:
step 1: crushing and screening the raw materials to pass through a sieve with 100 meshes and 200 meshes;
step 2, weighing brown corundum, silicon carbide, white corundum, mullite, alumina, chromium oxide, Guangxi white mud and pine needle soil according to the parts by weight, and mixing to obtain a mixture a;
and step 3: uniformly stirring the mixture a by using a mixer, feeding the mixture into a wet mill, adding water, an adhesive and an auxiliary agent according to the weight part, and treating for 20-35 min;
and 4, step 4: pressing and molding the material treated in the step 3 by a pressure molding machine of 250-350t, wherein the density is 2-5g/cm3Then sending the mixture into a dryer, setting the drying temperature to be 80-110 ℃, and drying for 1-3 h;
and 5, feeding the molded material into a roasting furnace for roasting for 8-15h at the roasting temperature of 1200-2000 ℃ to obtain a finished product.
In example 2, step 1, each material was ground and sieved through a 100 mesh sieve.
In step 2 of example 2, the following components are weighed in parts by weight: 20 parts of brown corundum, 6 parts of silicon carbide, 10 parts of white corundum, 8 parts of mullite, 5 parts of alumina, 4 parts of chromium oxide, 15 parts of Guangxi white mud and 10 parts of pine needle soil.
In step 3 of example 2, the feed particle size was 20mm, the rotational speed was 20 rpm, the power was 12KW, the weight was 7t, and the treatment was 35min when the feed was fed to the wet mill.
In step 3 of example 2, the following were added in parts by weight: 30 parts of water, 20 parts of adhesive and 8 parts of auxiliary agent; wherein the auxiliary agent is a plasticizer and a bonding agent.
In step 4 of example 2, the treated material was press-molded with a 250t press molding machine to have a density of 2g/cm3And then sending the mixture into a dryer, setting the drying temperature to be 80 ℃, and drying for 3 h.
In step 5 of example 2, the molded material was fired in a firing furnace at 1800 ℃ for 10 hours to obtain a finished product.
Example 3
The production method of the novel composite corundum brick for the blast furnace comprises the following steps:
step 1: crushing and screening the raw materials to pass through a sieve with 100 meshes and 200 meshes;
step 2, weighing brown corundum, silicon carbide, white corundum, mullite, alumina, chromium oxide, Guangxi white mud and pine needle soil according to the parts by weight, and mixing to obtain a mixture a;
and step 3: uniformly stirring the mixture a by using a mixer, feeding the mixture into a wet mill, adding water, an adhesive and an auxiliary agent according to the weight part, and treating for 20-35 min;
and 4, step 4: pressing and molding the material treated in the step 3 by a pressure molding machine of 250-350t, wherein the density is 2-5g/cm3Then sending the mixture into a dryer, setting the drying temperature to be 80-110 ℃, and drying for 1-3 h;
and 5, feeding the molded material into a roasting furnace for roasting for 8-15h at the roasting temperature of 1200-2000 ℃ to obtain a finished product.
In example 3, step 1, each material was sieved through a 200 mesh sieve by crushing and sieving.
In step 2 of example 3, the following components are weighed in parts by weight: 30 parts of brown corundum, 10 parts of silicon carbide, 20 parts of white corundum, 12 parts of mullite, 10 parts of alumina, 5 parts of chromium oxide, 25 parts of Guangxi white mud and 10 parts of pine needle soil.
In example 3, step 3, the feed particle size was 30mm, the rotational speed was 30 rpm, the power was 20KW, the weight was 15t, and the treatment was 25min when the feed was fed to the wet mill.
In step 3 of example 3, the following were added in parts by weight: 50 parts of water, 40 parts of adhesive and 12 parts of auxiliary agent.
In step 4 of example 3, the treated material was press-molded with a 350t press molding machine to have a density of 4g/cm3And then the mixture is sent into a dryer, the drying temperature is set to be 110 ℃, and the drying treatment is carried out for 1.5 h.
In the step 5 of the embodiment 3, the molded material is sent to a roasting furnace to be roasted for 15h, and the roasting temperature is 1500 ℃, so that a finished product is obtained.
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. The production method of the novel composite corundum brick for the blast furnace is characterized by comprising the following steps:
step 1: crushing and screening the raw materials to pass through a sieve with 100 meshes and 200 meshes;
step 2, weighing brown corundum, silicon carbide, white corundum, mullite, alumina, chromium oxide, Guangxi white mud and pine needle soil according to the parts by weight, and mixing to obtain a mixture a;
and step 3: uniformly stirring the mixture a by using a mixer, feeding the mixture into a wet mill, adding water, an adhesive and an auxiliary agent according to the weight part, and treating for 20-35 min;
and 4, step 4: pressing and molding the material treated in the step 3 by a pressure molding machine of 250-350t, wherein the density is 2-5g/cm3Then sending the mixture into a dryer, setting the drying temperature to be 80-110 ℃, and drying for 1-3 h;
and 5: and (3) feeding the formed material into a roasting furnace to be roasted for 8-15h, wherein the roasting temperature is 1200-2000 ℃, and obtaining a finished product.
2. The method for producing the composite corundum brick for the blast furnace according to claim 1, wherein in the step 1, the raw materials are crushed and sieved to pass through a sieve of 150 meshes.
3. The production method of the novel composite corundum brick for the blast furnace according to claim 1, is characterized in that in the step 2, the following components are weighed according to the parts by weight: 20-30 parts of brown fused alumina, 6-10 parts of silicon carbide, 10-20 parts of white fused alumina, 8-15 parts of mullite, 5-10 parts of alumina, 4-7 parts of chromium oxide, 15-25 parts of Guangxi white mud and 10-15 parts of pine needle soil.
4. The production method of the novel composite corundum brick for the blast furnace according to claim 1, is characterized in that in the step 2, the following components are weighed according to the parts by weight: 25 parts of brown corundum, 8 parts of silicon carbide, 15 parts of white corundum, 12 parts of mullite, 7 parts of alumina, 5 parts of chromium oxide, 20 parts of Guangxi white mud and 13 parts of pine needle soil.
5. The method for producing the novel composite corundum brick for the blast furnace according to the claim 1, characterized in that, in the step 3, when the corundum brick is fed into a wet mill, the feeding granularity is 20-30mm, the rotating speed is 15-30 r/min, the power is 10-25KW, the weight of the mill is 7-17t, and the treatment is carried out for 25-35 min.
6. The method for producing the novel composite corundum brick for the blast furnace according to the claim 1, characterized in that, in the step 3, when the corundum brick is fed into a wet mill, the feeding granularity is 25mm, the rotating speed is 25 r/min, the power is 15.5KW, the weight of the mill is 12t, and the treatment time is 30 min.
7. The production method of the novel composite corundum brick for the blast furnace according to claim 1, is characterized in that in the step 3, the following components are added in parts by weight: 30-50 parts of water, 20-40 parts of adhesive and 8-15 parts of auxiliary agent; wherein the auxiliary agent is a plasticizer and a bonding agent.
8. The production method of the novel composite corundum brick for the blast furnace according to claim 1, is characterized in that in the step 3, the following components are added in parts by weight: 40 parts of water, 30 parts of adhesive and 10 parts of auxiliary agent.
9. The method for producing the composite corundum brick for the blast furnace as claimed in claim 1, wherein in the step 4, the material processed in the step 3 is pressed and formed by a 300t pressure forming machine, and the density is 3g/cm3And then the mixture is sent into a dryer, the drying temperature is set to be 90 ℃, and the drying treatment is carried out for 2.5 h.
10. The method for producing the composite corundum brick for the blast furnace as claimed in claim 1, wherein in step 5, the formed material is fed into a roasting furnace to be roasted for 12 hours, and the roasting temperature is 1800 ℃.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010271934.4A CN111393176A (en) | 2020-04-09 | 2020-04-09 | Production method of novel composite corundum brick for blast furnace |
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| CN113979760A (en) * | 2021-11-16 | 2022-01-28 | 宜兴市海科耐火材料制品有限公司 | Preparation method of high-thermal-shock chromium corundum brick for hazardous waste gas melting furnace |
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Application publication date: 20200710 |