CN112358282B - Castable for iron hook and preparation method thereof - Google Patents
Castable for iron hook and preparation method thereof Download PDFInfo
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- CN112358282B CN112358282B CN202011253950.7A CN202011253950A CN112358282B CN 112358282 B CN112358282 B CN 112358282B CN 202011253950 A CN202011253950 A CN 202011253950A CN 112358282 B CN112358282 B CN 112358282B
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Abstract
The invention belongs to the technical field of castable processing, and relates to a castable for a blast furnace iron-making iron runner and a preparation method thereof. The castable disclosed by the invention is composed of 50-60 wt% of brown fused alumina, 0.05-0.1 wt% of polypropylene fiber, 20-30 wt% of silicon carbide, 10-15 wt% of a binding agent, 2-5 wt% of an antioxidant and 0.05-0.3 wt% of a water reducing agent, wherein the antioxidant is composed of ferrosilicon nitride and metal aluminum powder and/or boron carbide. The castable disclosed by the invention is low in cost, has higher sintering performance, stronger oxidation resistance and rupture and pressure resistance strength, and can be used as the castable for the main channel of the blast furnace to prolong the service life of the iron channel.
Description
Technical Field
The invention relates to the technical field of castable processing, in particular to a castable for a main channel of a blast furnace and a preparation method thereof.
Background
With the continuous development of metallurgical technology, the effective volume and furnace pressure of a blast furnace are continuously increased, the tapping temperature and the tapping flow rate are continuously increased, the load of a tapping channel system is improved, and the erosion degree of a tapping channel refractory material is increased. At present, Al is used as the refractory material for most domestic iron runners2O3the-SiC-C castable has the advantages of high strength, scouring resistance, long service life and the like, but SiC in the material is easy to oxidize, so that the erosion resistance of the material is lost. The antioxidant used at present is generally metal silicon powder, and the cost is high.
Disclosure of Invention
In order to solve the above problems, an object of the present invention is to provide a castable for a main channel of a blast furnace, which utilizes a novel antioxidant to make silicon carbide in the castable not easily oxidized, and at the same time, to remarkably improve compressive strength, flexural strength, etc. of the castable.
In order to solve the technical problems, the technical solution adopted by the invention is as follows:
a castable for a main channel is composed of the following raw materials in percentage by weight:
50 to 60 percent of brown corundum,
0.05 to 0.1 percent of polypropylene fiber,
20 to 30 percent of silicon carbide,
10 to 15 percent of binding agent,
2 to 5 percent of antioxidant,
0.05-0.3% of water reducing agent, wherein the sum of the raw materials is 100%;
the antioxidant is composed of ferrosilicon nitride and metal aluminum powder and/or boron carbide.
Specifically, in some embodiments, the brown fused alumina Al of the present invention2O3The content is not less than 95 wt%.
Specifically, in some embodiments, the polypropylene fibers of the present invention have a length of 0.5 to 1cm and a denier per filament of 1 to 1.5 dtex.
Specifically, in some embodiments, the bonding agent of the present invention is composed of alumina micropowder, spherical asphalt, cement, and silica micropowder.
Preferably, the particle size of the alumina micro powder is 1-3 μm, the particle size of the silica micro powder is 5-10 μm, and the particle size of the cement and the spherical asphalt is 3-5 μm.
More preferably, the bonding agent is formed by mixing alumina micropowder, spherical asphalt, cement and silicon micropowder according to the weight ratio of 12:5:5: 5.
Specifically, in some embodiments, the antioxidant agent of the present invention is formed by mixing ferrosilicon nitride, metal aluminum powder and boron carbide in a weight ratio of 60:3: 0-10.
Specifically, in some embodiments, the water reducer of the present invention is one or a mixture of sodium hexametaphosphate or a water reducer BC-2.
The invention also aims to provide a preparation method of the castable for the main channel of the blast furnace, which comprises the following steps:
(1) weighing brown corundum and silicon carbide according to a proportion, and mixing for 30-120 s;
(2) and (2) adding the polypropylene fiber, the bonding agent, the antioxidant and the water reducing agent into the mixture obtained in the step (1) according to a proportion, stirring for 3min, uniformly stirring and bagging.
Compared with the prior art, the invention has the following beneficial effects:
the castable disclosed by the invention is used for pouring the main channel of the iron hook, so that the oxidation resistance of the main channel is improved, the castable is easy to sinter, and the fracture-resistant and pressure-resistant strength is high.
Detailed Description
The invention will be further illustrated by reference to the following specific examples, which are provided by way of illustration of brown fused alumina Al2O3The content is 95 wt%, the length of the polypropylene fiber is 0.5-1cm, and the filament number is 1-1.5 dtex.
Example 1
Weighing the following raw materials in percentage by weight:
10 percent of brown corundum with the grain diameter of 8-15mm, 15 percent of brown corundum with the grain diameter of 5-8mm, 10 percent of brown corundum with the grain diameter of 3-5mm, 19 percent of brown corundum with the grain diameter of 1-3mm, 3 percent of brown corundum with the grain diameter of less than 1mm, 26 percent of silicon carbide, 13.5 percent of bonding agent, 3.22 percent of antioxidant, 0.2 percent of water reducing agent and 0.08 percent of polypropylene fiber.
The bonding agent is formed by mixing alumina micro powder with the particle size of 1 micron, silicon micro powder with the particle size of 2.5 microns, spherical asphalt with the diameter of 5 microns and cement according to the mass ratio of 12:5:5: 5;
the antioxidant is prepared by mixing ferrosilicon nitride, metal aluminum powder and boron carbide according to the mass ratio of 60:3: 10;
the water reducing agent is prepared from sodium hexametaphosphate and a water reducing agent BC-2 in a mass ratio of 1: 3, and mixing.
The embodiment provides a preparation method of the castable, which comprises the following steps: taking the raw materials in proportion; putting brown fused alumina and silicon carbide with different granularities into a stirrer, stirring for about 30s, adding the polypropylene fiber, the bonding agent, the antioxidant and the water reducing agent into the stirrer, stirring for 3min, stirring uniformly and bagging.
The properties of the prepared iron runner castable are shown in the following table 1:
TABLE 1
The data shows that the castable is prepared into cuboid sample blocks of 40mm multiplied by 160mm after being added with about 4.3 percent of water.
Example 2
Weighing the following raw materials in percentage by weight:
10 percent of brown corundum with the grain diameter of 8-15mm, 15 percent of brown corundum with the grain diameter of 5-8mm, 10 percent of brown corundum with the grain diameter of 3-5mm, 19 percent of brown corundum with the grain diameter of 1-3mm, 3 percent of brown corundum with the grain diameter of less than 1mm, 26 percent of silicon carbide, 13.5 percent of bonding agent, 3.22 percent of antioxidant, 0.2 percent of water reducing agent and 0.08 percent of polypropylene fiber.
The bonding agent is formed by mixing 1 micron of alumina micro powder, 2.5 micron of silicon micro powder, 5 micron of spherical asphalt and 5 micron of cement according to the mass ratio of 12:5:5: 5;
the antioxidant is prepared by mixing ferrosilicon nitride, metal aluminum powder and boron carbide according to the mass ratio of 60:3: 4;
the water reducing agent is prepared from sodium hexametaphosphate and a water reducing agent BC-2 in a mass ratio of 1: 3, and mixing.
The embodiment provides a preparation method of the castable, which comprises the following steps: taking the raw materials according to the proportion; putting brown corundum and silicon carbide with different particle sizes into a stirrer, stirring for about 30s, adding the polypropylene fiber, the binding agent, the antioxidant and the water reducing agent into the stirrer, stirring for 3min, uniformly stirring and bagging.
The properties of the prepared iron runner castable are shown in the following table 2:
TABLE 2
Comparative example 1
Weighing the following raw materials in percentage by weight:
10 percent of brown corundum with the grain diameter of 8-15mm, 15 percent of brown corundum with the grain diameter of 5-8mm, 10 percent of brown corundum with the grain diameter of 3-5mm, 19 percent of brown corundum with the grain diameter of 1-3mm, 6 percent of brown corundum with the grain diameter of less than 1mm, 26 percent of silicon carbide, 13.5 percent of bonding agent, 0.22 percent of antioxidant, 0.2 percent of water reducing agent and 0.08 percent of polypropylene fiber.
The bonding agent is formed by mixing alumina micro powder with the particle size of 1 micron, silicon micro powder with the particle size of 2.5 microns, spherical asphalt with the diameter of 5 microns and cement according to the mass ratio of 12:5:5: 5;
the antioxidant metal aluminum powder;
the water reducing agent is prepared from sodium hexametaphosphate and a water reducing agent BC-2 in a mass ratio of 1: 3, mixing the components.
The embodiment provides a preparation method of the castable, which comprises the following steps: taking the raw materials according to the proportion; putting brown corundum and silicon carbide with different particle sizes into a stirrer, stirring for about 30s, adding the polypropylene fiber, the binding agent, the antioxidant and the water reducing agent into the stirrer, stirring for 3min, uniformly stirring and bagging.
The properties of the prepared iron runner castable are shown in the following table 3:
TABLE 3
Comparative example 2
Weighing the following raw materials in percentage by weight:
10 percent of brown corundum with the grain diameter of 8-15mm, 15 percent of brown corundum with the grain diameter of 5-8mm, 10 percent of brown corundum with the grain diameter of 3-5mm, 19 percent of brown corundum with the grain diameter of 1-3mm, 6 percent of brown corundum with the grain diameter of less than 1mm, 26 percent of silicon carbide, 13.5 percent of bonding agent, 0.22 percent of antioxidant, 0.2 percent of water reducing agent and 0.08 percent of polypropylene fiber.
The bonding agent is formed by mixing alumina micro powder with the particle size of 1 micron, silicon micro powder with the particle size of 2.5 microns, spherical asphalt with the diameter of 5 microns and cement according to the mass ratio of 12:5:5: 5;
the antioxidant is ferrosilicon nitride;
the water reducing agent is prepared from sodium hexametaphosphate and a water reducing agent BC-2 in a mass ratio of 1: 3, and mixing.
The embodiment provides a preparation method of the castable, which comprises the following steps: taking the raw materials according to the proportion; putting brown corundum and silicon carbide with different particle sizes into a stirrer, stirring for about 30s, adding the polypropylene fiber, the binding agent, the antioxidant and the water reducing agent into the stirrer, stirring for 3min, uniformly stirring and bagging.
The properties of the prepared iron runner castable are shown in the following table 4:
TABLE 4
Comparing examples 1 and 2 with comparative examples 1 and 2, the composite antioxidant added with the ferrosilicon nitride is found to have obviously improved high-temperature performance compared with the antioxidant of the metal Al and the ferrosilicon nitride.
The principles and embodiments of the present invention have been described herein using specific examples, which are provided only to help understand the method and the core concept of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the invention.
Claims (8)
1. The castable for the main channel of the blast furnace is characterized by comprising the following raw materials in percentage by weight:
50 to 60 percent of brown corundum,
0.05 to 0.1 percent of polypropylene fiber,
20 to 30 percent of silicon carbide,
10 to 15 percent of binding agent,
2 to 5 percent of antioxidant,
0.05-0.3% of water reducing agent, wherein the sum of the raw materials is 100%;
the antioxidant is prepared by mixing ferrosilicon nitride, metal aluminum powder and boron carbide according to the weight ratio of 60:3: 0-10.
2.The castable for a blast furnace main runner according to claim 1, wherein Al in the brown alumina2O3The content is not less than 95 wt%, the porosity is less than 2.3%, and the bulk density is more than 3.7g/cm3。
3. The castable for a main channel of a blast furnace according to claim 1, wherein the polypropylene fiber has a length of 0.5 to 1cm and a single fiber fineness of 1 to 1.5 dtex.
4. The castable for a main channel of a blast furnace according to claim 1, wherein the binder is composed of alumina micropowder, spherical asphalt, cement, and silica micropowder.
5. The castable for a main channel of a blast furnace according to claim 4, wherein the alumina fine powder has a particle size of 3 μm, the silica fine powder has a particle size of < 200 mesh, the cement has a particle size of 30 to 60 μm, and the spherical pitch has a particle size of 0 to 1 mm.
6. The castable for the main trough of the blast furnace according to claim 4, wherein the binder is prepared by mixing alumina micropowder, spherical asphalt, cement and silica micropowder in a weight ratio of 12:5:5: 5.
7. The castable for the blast furnace main runner according to claim 1, wherein the water reducing agent is one or a mixture of two of sodium hexametaphosphate and a water reducing agent BC-2.
8. A preparation method of the castable for the main channel of the blast furnace as claimed in any one of claims 1 to 7, characterized by comprising the following steps:
(1) weighing brown corundum and silicon carbide according to a proportion, and mixing for 30-120 s;
(2) and (2) adding the polypropylene fiber, the bonding agent, the antioxidant and the water reducing agent into the mixture obtained in the step (1) according to a proportion, stirring for 3min, uniformly stirring and bagging.
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| CN112979290B (en) * | 2021-02-24 | 2022-09-13 | 北京利尔高温材料股份有限公司 | High-strength corrosion-resistant castable for sialon generated in situ and preparation method thereof |
| CN114873994B (en) * | 2022-03-24 | 2023-08-18 | 北京利尔高温材料股份有限公司 | Composite antioxidation tundish dry material and preparation method thereof |
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| CN109180206A (en) * | 2018-10-26 | 2019-01-11 | 通达耐火技术股份有限公司 | A kind of preparation method of the compound anti-erosion abrasion-proof and refractory pouring material of titanium |
| CN109836138A (en) * | 2019-04-15 | 2019-06-04 | 郑州市瑞沃耐火材料有限公司 | Large and medium-sized blast furnace iron runner castable |
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