CN115636662B - Chromium carbide-added main channel castable for blast furnace tapping channel and preparation method thereof - Google Patents
Chromium carbide-added main channel castable for blast furnace tapping channel and preparation method thereof Download PDFInfo
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- CN115636662B CN115636662B CN202211417435.7A CN202211417435A CN115636662B CN 115636662 B CN115636662 B CN 115636662B CN 202211417435 A CN202211417435 A CN 202211417435A CN 115636662 B CN115636662 B CN 115636662B
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Abstract
The invention provides a blast furnace tapping channel main channel castable added with chromium carbide and a preparation method thereof, wherein the castable comprises the following components in percentage by mass: 40-50% of white corundum, 10-20% of chrome corundum, 16-25% of silicon carbide, 1-3% of silica fume, 5-9% of alpha-alumina, 0.3-1% of chromium carbide, 0.3-1% of nickel oxide, 1-4% of bonding agent, 2-4% of carbon material, 0.9-2.8% of metal silicon powder, 0.1-0.5% of dispersing agent and 0.1-0.5% of explosion-proof agent. The chromium carbide and the nickel oxide are added into the castable, the chromium carbide can react with oxygen to generate chromium oxide, on one hand, oxygen can be consumed, the carbon material is prevented from reacting with the oxygen, on the other hand, the chromium oxide and the nickel oxide form nickel-chromium spinel at high temperature to form a compact ceramic layer, so that the material is more compact, and the castable is further prevented from being oxidized.
Description
Technical Field
The invention belongs to the technical field of refractory materials, and particularly relates to a chromium carbide-added main channel castable for a blast furnace tapping channel and a preparation method thereof.
Background
The blast furnace tapping channel is a channel for guiding high-temperature molten iron and molten slag in the blast furnace, the blast furnace tapping channel system comprises a main channel, a branch channel and a slag channel, the durability of the refractory material for the blast furnace tapping channel directly influences the normal production and operation rate of the blast furnace, and the refractory material for the main channel is the most critical. This is because the main runner is used in a more severe environment, and the main runner needs to withstand not only the erosion of high-temperature molten slag but also the erosion of high-temperature molten iron, and also the thermal shock damage to the main runner due to the temperature shock caused by intermittent tapping.
At present, in order to improve the slag corrosion resistance of a main channel of a blast furnace tapping channel, a carbon material is usually added into a main channel castable, the carbon material is not soaked by slag iron, and the slag corrosion resistance of the main channel can be improved. Therefore, the blast furnace tapping channel main channel castable with good slag resistance and oxidation resistance needs to be provided.
Disclosure of Invention
The invention solves the problem of poor oxidation resistance of the existing blast furnace iron tap channel main channel castable, and provides the blast furnace iron tap channel main channel castable added with chromium carbide and a preparation method thereof.
In order to solve the problems, the invention provides a chromium carbide-added blast furnace tapping channel main channel castable which comprises the following components in percentage by mass:
40-50% of white corundum, 10-20% of chrome corundum, 16-25% of silicon carbide, 1-3% of silica fume, 5-9% of alpha-alumina, 0.3-1% of chromium carbide, 0.3-1% of nickel oxide, 1-4% of binding agent, 2-4% of carbon material, 0.9-2.8% of metal silicon powder, 0.1-0.5% of dispersing agent and 0.1-0.5% of explosion-proof agent.
Preferably, the blast furnace tapping channel main channel castable added with chromium carbide comprises the following components in percentage by mass:
42 to 48 percent of white corundum, 14 to 18 percent of chrome corundum, 18 to 22 percent of silicon carbide, 1.5 to 2.5 percent of silica fume, 6 to 8 percent of alpha-alumina, 0.5 to 0.8 percent of chromium carbide, 0.4 to 0.8 percent of nickel oxide, 1.5 to 3.5 percent of bonding agent, 2.5 to 3.5 percent of carbon material, 1 to 2.6 percent of metal silicon powder, 0.2 to 0.5 percent of dispersant and 0.1 to 0.5 percent of explosion-proof agent.
Preferably, the mass ratio of the chromium carbide to the nickel oxide is 1: (1-2).
Preferably, the carbon material is coke powder.
Preferably, the white corundum comprises 2:3:2: (2-3) particles having a particle size of 15-8mm, particles having a particle size of 8-5mm, particles having a particle size of 5-3mm, particles having a particle size of 3-1 mm;
the chromium corundum comprises the following components in percentage by mass (1-2): (2-1) particles having a particle size of 3-1mm, particles having a particle size of 1-0 mm;
the silicon carbide comprises the following components in percentage by mass (4-9): (12-14) particles having a particle size of 1-0mm and fine powder having a particle size of 325 mesh;
the granularity of the alpha-alumina is less than or equal to 1 mu m.
Preferably, in the white corundum, al 2 O 3 ≥99.5wt%、Fe 2 O 3 ≤0.03wt%、R 2 O≤0.03wt%、SiO 2 Not more than 0.3wt%, and the volume density of the white corundum particles is not less than 3.5g/cm 3 ；
In the chromium corundum, al 2 O 3 ≥80wt%、Cr 2 O 3 ≥12wt%、Fe 2 O 3 ≤0.3wt%、R 2 O≤0.5wt%、SiO 2 Not less than 0.3wt%, and the volume density of the chromium corundum particles is not less than 3.5g/cm 3 ；
In the silicon carbide, the SiC accounts for more than or equal to 97wt%, and the Fe accounts for 2 O 3 Less than or equal to 0.4wt%, less than or equal to 0.5wt% of free carbon, and less than or equal to 0.6wt% of free silicon.
Preferably, the binder is high alumina cement.
Preferably, the explosion-proof agent is at least one of metal aluminum powder and polypropylene fiber.
Preferably, the dispersant is sodium tripolyphosphate.
The second aspect of the invention provides a preparation method of the blast furnace tapping channel main channel castable added with chromium carbide, which comprises the following steps:
mixing white corundum, chrome corundum, silicon carbide, silica fume, alpha-alumina, chromium carbide, nickel oxide, the bonding agent, the carbon material, the metal silicon powder, the dispersing agent and the explosion-proof agent to obtain the blast furnace tapping channel main channel castable added with chromium carbide.
Compared with the prior art, the invention has the following beneficial effects:
the chromium carbide-added main channel castable for the blast furnace tapping channel is added with a carbon material for improving the slag corrosion resistance of the castable, but the carbon material is easy to oxidize to cause poor oxidation resistance of the castable.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the following embodiments of the present invention, 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.
In order to improve the slag corrosion resistance of the main channel of the blast furnace tapping channel, a carbon material (such as a carbon material) is usually added into the main channel castable, the carbon material is not soaked by slag iron, and the slag corrosion resistance of the main channel can be improved. Therefore, in a first aspect of embodiments of the present invention, a chromium carbide-added castable for a main channel of a blast furnace tapping channel is provided, which comprises the following components by mass:
40-50% of white corundum, 10-20% of chrome corundum, 16-25% of silicon carbide, 1-3% of silica fume, 5-9% of alpha-alumina, 0.3-1% of chromium carbide, 0.3-1% of nickel oxide, 1-4% of bonding agent, 2-4% of carbon material, 0.9-2.8% of metal silicon powder, 0.1-0.5% of dispersing agent and 0.1-0.5% of explosion-proof agent.
According to the blast furnace tapping channel main channel castable added with chromium carbide, disclosed by the embodiment of the invention, in order to improve the slag corrosion resistance of the castable, a carbon material is added, but the carbon material is easy to oxidize, so that the oxidation resistance of the castable is poor.
Preferably, the blast furnace tapping channel main channel castable added with chromium carbide comprises the following components in percentage by mass:
42 to 48 percent of white corundum, 14 to 18 percent of chrome corundum, 18 to 22 percent of silicon carbide, 1.5 to 2.5 percent of silica fume, 6 to 8 percent of alpha-alumina, 0.5 to 0.8 percent of chrome carbide, 0.4 to 0.8 percent of nickel oxide, 1.5 to 3.5 percent of bonding agent, 2.5 to 3.5 percent of carbon material, 1 to 2.6 percent of metallic silicon powder, 0.2 to 0.5 percent of dispersant and 0.1 to 0.5 percent of explosion-proof agent.
The chromium carbide-added main channel castable for the blast furnace tapping channel disclosed by the embodiment of the invention is further optimized in mass percentage of each component, and experimental research shows that when the percentage range is adopted, the obtained castable has better oxidation resistance, slag corrosion resistance and strength performance.
Preferably, the mass ratio of the chromium carbide to the nickel oxide is 1: (1-2).
The nickel-chromium spinel formed by the chromium oxide and the nickel oxide needs to be in a certain mass ratio range, the total amount of the formed nickel-chromium spinel is not more and better, the nickel-chromium spinel is too much, the chromium carbide is seriously oxidized, the internal structure of the material becomes loose, the strength of the material is reduced, the nickel-chromium spinel is too little formed, and a compact ceramic layer is insufficient, so that the oxidation resistance of the casting material for the main runner of the tapping runner is not high. Experimental research shows that when the mass ratio of the chromium carbide to the nickel oxide is within the above proportion range, the optimal amount of nickel chromium spinel can be formed, so that the castable has good oxidation resistance and strength performance.
Wherein, the carbon material refers to carbon-containing material, such as coke powder, ball pitch, etc., and the carbon material is not infiltrated by the iron slag, thus improving the slag corrosion resistance of the main runner. In some embodiments, the carbonaceous material is coke powder. The granularity of the ball asphalt is 0.2-1mm, the dispersibility is poor, so the slag resistance is poor, and the coke powder belongs to ultrafine powder, and the dispersibility in the casting material is good, so the slag resistance of the casting material can be better improved.
The white corundum can improve the alumina content of the material, reduce the liquid phase generation amount of the material under the high-temperature condition, further improve the high-temperature performance of the material, has a wide optional particle size range, and preferably comprises the following components in percentage by mass of 2:3:2: (2-3) particles having a particle size of 15-8mm, particles having a particle size of 8-5mm, particles having a particle size of 5-3mm, particles having a particle size of 3-1 mm. Preferably, in white corundum, al 2 O 3 ≥99.5wt%、Fe 2 O 3 ≤0.03wt%、R 2 O≤0.03wt%、SiO 2 Not more than 0.3wt%, and the volume density of the white corundum particles is not less than 3.5g/cm 3 。
The chromium corundum has good slag corrosion resistance, the selectable particle size range of the chromium corundum is wide, and preferably, the chromium corundum comprises the following components in percentage by mass (1-2): (2-1) particles having a particle size of 3-1mm, particles having a particle size of 1-0 mm. Preferably, in the chrome corundum, al 2 O 3 ≥80wt%、Cr 2 O 3 ≥12wt%、Fe 2 O 3 ≤0.3wt%、R 2 O≤0.5wt%、SiO 2 Not more than 0.3wt%, and the volume density of the chromium corundum particles is not less than 3.5g/cm 3 。
The silicon carbide has the advantages of stable chemical property, high thermal conductivity, small thermal expansion coefficient, good wear resistance, wide selectable particle size range, and preferably the silicon carbide comprises the following components in percentage by mass (4-9): (12-14) particles having a particle size of 1-0mm and fine powder having a particle size of 325 mesh. Preferably, in the silicon carbide, the SiC is more than or equal to 97wt percent, and the Fe 2 O 3 Less than or equal to 0.4wt percent, less than or equal to 0.5wt percent of free carbon and less than or equal to 0.6wt percent of free silicon.
The alpha-alumina has uniform particle size distribution, high purity, high dispersion, low specific surface and high temperature resistance inertia, and preferably the particle size of the alpha-alumina is less than or equal to 1 mu m.
The binder is used for tightly binding the aggregate and the fine powder, and the binder can be high-alumina cement or rho alumina. Preferably, the bonding agent is high-alumina cement, and the bonding property of the high-alumina cement is better.
The explosion-proof agent reacts with water in the material to generate hydrogen, and fine through holes are formed in the material, so that redundant water in the material can be quickly removed, and the material is prevented from high-temperature bursting. Preferably, the explosion-proof agent is at least one of metal aluminum powder and polypropylene fiber.
The dispersant has the functions of reducing the water adding amount of the material, lowering the porosity of the material and increasing the volume density of the material. Preferably, the dispersant is sodium tripolyphosphate.
The second aspect of the embodiment of the invention provides a preparation method of the blast furnace tapping channel main channel castable added with chromium carbide, which comprises the following steps:
mixing white corundum, chrome corundum, silicon carbide, silica fume, alpha-alumina, chromium carbide, nickel oxide, the bonding agent, a carbon material, the dispersing agent, metal silicon powder and the explosion-proof agent to obtain the blast furnace tapping channel main channel castable added with chromium carbide.
Examples
In the following examples, the starting materials used are all commercially available.
It should be noted that, herein, particles having a particle size of 15 to 8mm, particles having a particle size of 8 to 5mm, particles having a particle size of 5 to 3mm, particles having a particle size of 3 to 1mm, particles having a particle size of 1 to 0mm, and fine powder having a particle size of 325 mesh are all specifications of commercial products, for example, particles having a particle size of 3 to 1mm mean particles having a particle size in the range of 1 to 3mm, particles having a particle size of 1 to 0mm mean particles having a particle size in the range of 0 to 1mm, and fine powder having a particle size of 325 mesh mean fine powder having a particle size of 0.045 mm.
R 2 O refers to the sum of basic oxides (e.g., potassium oxide, sodium oxide, etc.).
The performance detection method of the castable obtained in the following embodiments comprises the following steps: adding 4.2% of water into the obtained casting material, stirring for 3 minutes, vibrating, casting and molding into sample blocks of 40mm multiplied by 160mm, curing for 24 hours, baking for 110 ℃ multiplied by 24 hours, testing cold-state breaking strength and compressive strength, then burning for 1450 ℃ multiplied by 3 hours in a high-temperature furnace, testing cold-state breaking strength and compressive strength, and testing hot-state breaking strength for 1400 ℃ multiplied by 0.5 hour.
Example 1
The castable for the main channel of the blast furnace tapping channel added with chromium carbide in the embodiment comprises the following components in percentage by mass:
10 percent of white corundum particles with the particle size of 15-8mm, 15 percent of white corundum particles with the particle size of 8-5mm, 10 percent of white corundum particles with the particle size of 5-3mm, 10 percent of white corundum particles with the particle size of 3-1mm, 10 percent of chrome corundum particles with the particle size of 3-1mm, 5 percent of chrome corundum particles with the particle size of 1-0mm, 9 percent of silicon carbide particles with the particle size of 1-0mm, 12 percent of silicon carbide fine powder with the particle size of 325 meshes, 2 percent of silica fume, 9 percent of alpha-alumina with the particle size of less than 1 mu m, 0.3 percent of chromium carbide, 0.3 percent of nickel oxide, 2.5 percent of high-alumina cement, 2.5 percent of coke powder, 0.25 percent of sodium hexametaphosphate, 1.9 percent of metal silicon powder, 0.2 percent of metal aluminum powder and 0.05 percent of organic fiber.
Among them, white corundum is Al 2 O 3 ≥99.5wt%、Fe 2 O 3 ≤0.03wt%、R 2 O≤0.03wt%、SiO 2 Not more than 0.3wt%, and the volume density of the white corundum particles is not less than 3.5g/cm 3 (ii) a In the chrome corundum, al 2 O 3 ≥80wt%、Cr 2 O 3 ≥12wt%、Fe 2 O 3 ≤0.3wt%、R 2 O≤0.5wt%、SiO 2 Not more than 0.3wt%, and the volume density of the chromium corundum particles is not less than 3.5g/cm 3 (ii) a In the silicon carbide, the SiC content is more than or equal to 97wt percent and the Fe content is more than or equal to 97wt percent 2 O 3 Less than or equal to 0.4wt%, less than or equal to 0.5wt% of free carbon, and less than or equal to 0.6wt% of free silicon.
The preparation method of the blast furnace tapping channel main channel castable added with chromium carbide comprises the following steps:
mixing white corundum, chrome corundum, silicon carbide, silica fume, alpha-alumina, chrome carbide, nickel oxide, a bonding agent, a carbon material, a dispersing agent, metal silicon powder and an explosion-proof agent according to the selected mass percentage, and stirring for 2 minutes to obtain the blast furnace tapping channel main channel castable added with chrome carbide.
Example 2
The castable for the main channel of the blast furnace tapping channel added with chromium carbide in the embodiment comprises the following components in percentage by mass:
10 percent of white corundum particles with the particle size of 15-8mm, 15 percent of white corundum particles with the particle size of 8-5mm, 10 percent of white corundum particles with the particle size of 5-3mm, 13 percent of white corundum particles with the particle size of 3-1mm, 7 percent of chromium corundum particles with the particle size of 3-1mm, 8 percent of chromium corundum particles with the particle size of 1-0mm, 6 percent of silicon carbide particles with the particle size of 1-0mm, 12 percent of silicon carbide fine powder with the particle size of 325 meshes, 2 percent of silica fume, 8.3 percent of alpha-alumina with the particle size of less than 1 mu m, 0.3 percent of chromium carbide, 0.5 percent of nickel oxide, 2.5 percent of high-alumina cement, 2.5 percent of coke powder, 0.25 percent of sodium hexametaphosphate, 2.4 percent of silicon metal powder, 0.2 percent of metal aluminum powder and 0.05 percent of organic fiber.
The method for preparing the castable for the main channel of the blast furnace tapping channel added with chromium carbide in the embodiment is the same as that of the embodiment 1.
Example 3
The castable for the main channel of the blast furnace tapping channel added with chromium carbide in the embodiment comprises the following components in percentage by mass:
10% of white corundum particles with the particle size of 15-8mm, 15% of white corundum particles with the particle size of 8-5mm, 10% of white corundum particles with the particle size of 5-3mm, 15% of white corundum particles with the particle size of 3-1mm, 5% of chromium corundum particles with the particle size of 3-1mm, 10% of chromium corundum particles with the particle size of 1-0mm, 4% of silicon carbide particles with the particle size of 1-0mm, 12% of silicon carbide fine powder with the particle size of 325 meshes, 2% of silica fume, 7.6% of alpha-alumina with the particle size of less than 1 mu m, 0.5% of chromium carbide, 1% of nickel oxide, 2.5% of high alumina cement, 2.5% of coke powder, 0.25% of sodium hexametaphosphate, 2.4% of metal silicon powder, 0.2% of metal aluminum powder and 0.05% of organic fibers.
The method for preparing the castable for the main channel of the blast furnace tapping channel added with chromium carbide in the embodiment is the same as that of the embodiment 1.
Example 4
The castable for the main channel of the blast furnace tapping channel added with chromium carbide in the embodiment comprises the following components in percentage by mass:
10 percent of white corundum particles with the particle size of 15-8mm, 15 percent of white corundum particles with the particle size of 8-5mm, 10 percent of white corundum particles with the particle size of 5-3mm, 10 percent of white corundum particles with the particle size of 3-1mm, 10 percent of chromium corundum particles with the particle size of 3-1mm, 5 percent of chromium corundum particles with the particle size of 1-0mm, 7 percent of silicon carbide particles with the particle size of 1-0mm, 14 percent of silicon carbide fine powder with the particle size of 325 meshes, 2 percent of silicon ash, 8.3 percent of alpha-aluminum oxide with the particle size of less than 1 mu m, 1 percent of chromium carbide, 1 percent of nickel oxide, 2.5 percent of high-alumina cement, 2.5 percent of coke powder, 0.25 percent of sodium hexametaphosphate, 1.2 percent of metal silicon powder, 0.2 percent of metal aluminum powder and 0.05 percent of organic fiber.
The method for preparing the castable for the main channel of the blast furnace tapping channel added with chromium carbide in the embodiment is the same as that of the embodiment 1.
Example 5
The castable for the main channel of the blast furnace tapping channel added with chromium carbide in the embodiment comprises the following components in percentage by mass:
10 percent of white corundum particles with the particle size of 15-8mm, 15 percent of white corundum particles with the particle size of 8-5mm, 10 percent of white corundum particles with the particle size of 5-3mm, 10 percent of white corundum particles with the particle size of 3-1mm, 10 percent of chrome corundum particles with the particle size of 3-1mm, 5 percent of chrome corundum particles with the particle size of 1-0mm, 8.5 percent of silicon carbide particles with the particle size of 1-0mm, 14 percent of silicon carbide fine powder with the particle size of 325 meshes, 2 percent of silica fume, 7.6 percent of alpha-alumina with the particle size of less than 1 mu m, 1 percent of chromium carbide, 1.5 percent of nickel oxide, 2.5 percent of high alumina cement, 2.5 percent of coke powder, 0.25 percent of sodium hexametaphosphate, 0.9 percent of metal silicon powder, 0.2 percent of metal aluminum powder and 0.05 percent of organic fiber.
The method for preparing the castable for the main channel of the blast furnace tapping channel added with chromium carbide in the embodiment is the same as that of the embodiment 1.
Example 6
The castable for the main channel of the blast furnace tapping channel added with chromium carbide in the embodiment comprises the following components in percentage by mass:
8 percent of white corundum particles with the particle size of 15-8mm, 12 percent of white corundum particles with the particle size of 8-5mm, 8 percent of white corundum particles with the particle size of 5-3mm, 12 percent of white corundum particles with the particle size of 3-1mm, 10 percent of chrome corundum particles with the particle size of 1-0mm, 9 percent of silicon carbide particles with the particle size of 1-0mm, 13.7 percent of silicon carbide fine powder with the particle size of 325 meshes, 1 percent of silicon ash, 5 percent of alpha-alumina with the particle size of less than 1 mu m, 0.5 percent of chromium carbide, 1 percent of nickel oxide, 4 percent of high-alumina cement, 2 percent of coke powder, 0.5 percent of sodium hexametaphosphate, 2.8 percent of metal silicon powder, 0.25 percent of metal aluminum powder and 0.25 percent of organic fiber.
The method for preparing the castable for the main channel of the blast furnace tapping channel added with chromium carbide in the embodiment is the same as that of the embodiment 1.
Example 7
The castable for the main channel of the blast furnace tapping channel added with chromium carbide in the embodiment comprises the following components in percentage by mass:
10% of white corundum particles with the particle size of 15-8mm, 15% of white corundum particles with the particle size of 8-5mm, 10% of white corundum particles with the particle size of 5-3mm, 13% of white corundum particles with the particle size of 3-1mm, 5% of chromium corundum particles with the particle size of 1-0mm, 10% of silicon carbide particles with the particle size of 1-0mm, 15% of silicon carbide fine powder with the particle size of 325 meshes, 3% of silica fume, 6% of alpha-alumina with the particle size of less than 1 mu m, 0.5% of chromium carbide, 0.8% of nickel oxide, 1% of high-alumina cement, 4% of coke powder, 0.1% of sodium hexametaphosphate, 1% of metal silicon powder, 0.3% of metal aluminum powder and 0.3% of organic fiber.
The method for preparing the castable for the main channel of the blast furnace tapping channel added with chromium carbide in the embodiment is the same as that of the embodiment 1.
Example 8
The castable for the main channel of the blast furnace tapping channel added with chromium carbide in the embodiment comprises the following components in percentage by mass:
8.4 percent of white corundum particles with the particle size of 15-8mm, 12.6 percent of white corundum particles with the particle size of 8-5mm, 8.4 percent of white corundum particles with the particle size of 5-3mm, 12.6 percent of white corundum particles with the particle size of 3-1mm, 6 percent of chrome corundum particles with the particle size of 3-1mm, 12 percent of chrome corundum particles with the particle size of 1-0mm, 5.5 percent of silicon carbide particles with the particle size of 1-0mm, 16.5 percent of silicon carbide fine powder with the particle size of 325 meshes, 1.5 percent of silicon ash, 6 percent of alpha-alumina with the particle size of less than 1 mu m, 0.5 percent of chromium carbide, 0.5 percent of nickel oxide, 3.5 percent of high alumina cement, 2.5 percent of coke powder, 2.5 percent of sodium hexametaphosphate, 0.5 percent of metal silicon powder, 0.2 percent of metal aluminum powder and 0.3 percent of organic fiber.
The method for preparing the castable of the blast furnace tapping channel main channel added with chromium carbide in the embodiment is the same as that of the embodiment 1.
Example 9
The castable for the main channel of the blast furnace tapping channel added with chromium carbide in the embodiment comprises the following components in percentage by mass:
10 percent of white corundum particles with the particle size of 15-8mm, 15 percent of white corundum particles with the particle size of 8-5mm, 10 percent of white corundum particles with the particle size of 5-3mm, 13 percent of white corundum particles with the particle size of 3-1mm, 10 percent of chromium corundum particles with the particle size of 3-1mm, 5 percent of chromium corundum particles with the particle size of 1-0mm, 6 percent of silicon carbide particles with the particle size of 1-0mm, 12 percent of silicon carbide fine powder with the particle size of 325 meshes, 2.5 percent of silica fume, 8 percent of alpha-alumina with the particle size of less than 1 mu m, 0.8 percent of chromium carbide, 0.8 percent of nickel oxide, 2.1 percent of high-alumina cement, 3.5 percent of coke powder, 1 percent of sodium hexametaphosphate, 0.2 percent of metal silicon powder, 0.05 percent of metal aluminum powder and 0.05 percent of organic fiber.
The method for preparing the castable for the main channel of the blast furnace tapping channel added with chromium carbide in the embodiment is the same as that of the embodiment 1.
Example 10
The castable for the main channel of the blast furnace tapping channel added with chromium carbide in the embodiment comprises the following components in percentage by mass:
10 percent of white corundum particles with the particle size of 15-8mm, 15 percent of white corundum particles with the particle size of 8-5mm, 10 percent of white corundum particles with the particle size of 5-3mm, 11 percent of white corundum particles with the particle size of 3-1mm, 7 percent of chrome corundum particles with the particle size of 1-0mm, 9 percent of silicon carbide particles with the particle size of 1-0mm, 12 percent of silicon carbide fine powder with the particle size of 325 meshes, 2 percent of silicon ash, 8 percent of alpha-aluminum oxide with the particle size of less than 1 mu m, 0.7 percent of chromium carbide, 0.8 percent of nickel oxide, 2 percent of high-alumina cement, 3 percent of coke powder, 2 percent of sodium hexametaphosphate, 0.3 percent of metal silicon powder, 0.1 percent of metal aluminum powder and 0.1 percent of organic fiber.
The method for preparing the castable of the blast furnace tapping channel main channel added with chromium carbide in the embodiment is the same as that of the embodiment 1.
Example 11
The remaining components of the castable of the blast furnace tapping channel main trough added with chromium carbide in the embodiment are the same as those in the embodiment 1, except that the coke powder is replaced by the ball asphalt, and the addition amount of the ball asphalt is the same as that of the coke powder.
Example 12
The castable for the main channel of the blast furnace tapping channel added with chromium carbide in the embodiment has the same components as those in the embodiment 3, and has the following differences: the mass content of chromium carbide is 1 percent, and the mass content of nickel oxide is 0.5 percent.
Example 13
The main channel castable of the blast furnace tapping channel added with chromium carbide in the embodiment has the same components as the embodiment 1, and the differences are as follows: the mass content of chromium carbide is 0.375%, and the mass content of nickel oxide is 1.125%.
Comparative example 1
The main channel castable of the blast furnace tapping channel of the comparative example has the same components as those in example 1 except that chromium carbide and nickel oxide are not added, and the comparative example of the other components is the same as that in example 1.
Comparative example 2
The other components of the main channel castable of the blast furnace tapping channel of the comparative example are the same as those of the example 1, except that nickel oxide is not added, and the other components are the same as those of the example 1 in the comparative example.
The performance test results of the blast furnace tapping channel main channel castable obtained in the above examples are shown in the following table 1. As can be seen from the data in table 1 below, the castable of comparative example 1 has poor oxidation resistance without adding chromium carbide and nickel oxide, resulting in poor strength performance, and the castable of comparative example 2 has poor strength performance due to adding chromium carbide but not adding nickel oxide, and thus has poor oxidation resistance. Example 11 compared with example 1, the replacement of coke powder with ball pitch reduced the slag resistance. The proportion of chromium carbide to nickel oxide in examples 12 and 13 is not in the preferred range, and the strength properties of the resulting castable are reduced. Examples 8 to 10 are preferred embodiments compared with examples 1 to 7, and the parts by mass of the components are preferred values, so that the obtained castable has better overall performance.
TABLE 1
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. This need not be, nor should it be exhaustive of all embodiments. And obvious variations or modifications therefrom are within the scope of the invention.
Claims (8)
1. The blast furnace tapping channel main channel castable added with chromium carbide is characterized by comprising the following components in percentage by mass:
40 to 50 percent of white corundum, 10 to 20 percent of chrome corundum, 16 to 25 percent of silicon carbide, 1 to 3 percent of silica fume, 5 to 9 percent of alpha-alumina, 0.3 to 1 percent of chromium carbide, 0.3 to 1 percent of nickel oxide, 1 to 4 percent of binding agent, 2 to 4 percent of carbon material, 0.9 to 2.8 percent of metallic silicon powder, 0.1 to 0.5 percent of dispersant and 0.1 to 0.5 percent of explosion-proof agent;
the mass ratio of the chromium carbide to the nickel oxide is 1:1-2;
the carbon material is coke powder.
2. The chromium carbide-added blast furnace tapping channel main channel castable according to claim 1, characterized by comprising the following components in percentage by mass:
42 to 48 percent of white corundum, 14 to 18 percent of chrome corundum, 18 to 22 percent of silicon carbide, 1.5 to 2.5 percent of silica fume, 6 to 8 percent of alpha-alumina, 0.5 to 0.8 percent of chromium carbide, 0.4 to 0.8 percent of nickel oxide, 1.5 to 3.5 percent of bonding agent, 2.5 to 3.5 percent of carbon material, 1 to 2.6 percent of metal silicon powder, 0.2 to 0.5 percent of dispersant and 0.1 to 0.5 percent of explosion-proof agent.
3. The chromium carbide-added blast furnace tapping channel main runner castable according to claim 1, characterized in that:
the white corundum comprises the following components in percentage by mass: 3:2:2-3 particles with a particle size of 15-8mm, 8-5mm, 5-3mm, 3-1 mm;
the chromium corundum comprises the following components in a mass ratio of 1-2:2-1 particles with a particle size of 3-1mm, 1-0 mm;
the silicon carbide comprises the following components in a mass ratio of 4-9:12-14 particles with a particle size of 1-0mm and fine powder with a particle size of 325 meshes;
the particle size of the alpha-alumina is less than or equal to 1 mu m.
4. The chromium carbide-added blast furnace tapping channel main runner castable according to claim 1, characterized in that:
in the white corundum, al 2 O 3 ≥99.5wt%、Fe 2 O 3 ≤0.03wt%、R 2 O≤0.03wt%、SiO 2 Not more than 0.3wt%, and the volume density of the white corundum particles is not less than 3.5g/cm 3 ；
In the chrome corundum, al 2 O 3 ≥80wt%、Cr 2 O 3 ≥12wt%、Fe 2 O 3 ≤0.3wt%、R 2 O≤0.5wt%、SiO 2 Not less than 0.3wt%, and the volume density of the chromium corundum particles is not less than 3.5g/cm 3 ；
In the silicon carbide, the SiC accounts for more than or equal to 97wt%, and the Fe accounts for 2 O 3 Less than or equal to 0.4wt%, less than or equal to 0.5wt% of free carbon, and less than or equal to 0.6wt% of free silicon.
5. The chromium carbide-added blast furnace tapping channel main runner castable according to claim 1, characterized in that:
the bonding agent is high-alumina cement.
6. The chromium carbide-added blast furnace tapping channel main runner castable according to claim 1, characterized in that:
the explosion-proof agent is at least one of metal aluminum powder and polypropylene fiber.
7. The chromium carbide-added blast furnace tapping channel main runner castable according to claim 1, characterized in that:
the dispersing agent is sodium tripolyphosphate.
8. A method for preparing the chromium carbide-added blast furnace tapping channel main channel castable according to any one of claims 1-7, characterized by comprising the following steps:
mixing white corundum, chrome corundum, silicon carbide, silica fume, alpha-alumina, chromium carbide, nickel oxide, the bonding agent, the carbon material, the metal silicon powder, the dispersing agent and the explosion-proof agent to obtain the blast furnace tapping channel main channel castable added with chromium carbide.
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| GB790672A (en) * | 1956-03-28 | 1958-02-12 | Norton Grinding Wheel Co Ltd | Process of making recrystallized silicon carbide articles |
| ES2215995T3 (en) * | 1993-01-22 | 2004-10-16 | Eaton Corporation | PROCESSES TO PREPARE A NITRURABLE BASE MATERIAL CONTAINING SILICON, AND SILICON NITRIDE MATERIALS. |
| RU2120925C1 (en) * | 1997-11-14 | 1998-10-27 | Александр Маркович Чуклай | Carbon-containing refractory |
| CN103979992B (en) * | 2014-06-09 | 2015-04-29 | 武汉科技大学 | Ladle porous brick and preparation method thereof |
| CN104355636B (en) * | 2014-10-31 | 2016-05-11 | 浙江金磊高温材料股份有限公司 | A kind of RH stove dip pipe castable and preparation method thereof |
| CN105237010A (en) * | 2015-11-03 | 2016-01-13 | 张婷 | Miniature type blast furnace branch iron runner castable |
| CN105777159B (en) * | 2016-03-17 | 2017-05-24 | 锦州集信高温材料有限公司 | Method for producing large-scale copper smelting furnace lining bricks by smelting chromium slag |
| CN107963895A (en) * | 2016-10-19 | 2018-04-27 | 北京利尔高温材料股份有限公司 | A kind of blast furnace iron outlet groove castable in main trough |
| CN106938921A (en) * | 2017-01-04 | 2017-07-11 | 上海新泰山高温工程材料有限公司 | A kind of pink fused alumina carborundum carbonaceous is tapped a blast furnace hook castable |
| CN107098711A (en) * | 2017-05-25 | 2017-08-29 | 嘉兴新耐建材有限公司 | A kind of Ferrous Metallurgy refractory material |
| CN107309814A (en) * | 2017-08-09 | 2017-11-03 | 安徽昌悌进出口贸易有限公司 | A kind of high grinding efficiency emery wheel |
| CN107759207A (en) * | 2017-11-20 | 2018-03-06 | 武汉科技大学 | Using aluminium chromium slag as blast furnace iron outlet groove castable of major ingredient and preparation method thereof |
| CN112341163A (en) * | 2020-11-17 | 2021-02-09 | 武汉科技大学 | Addition of C @ Cr3C2Low-carbon magnesia-carbon refractory material of composite powder and preparation method thereof |
| CN114163254B (en) * | 2022-02-11 | 2022-04-26 | 北京利尔高温材料股份有限公司 | Blast furnace iron tap channel main channel castable |
| CN115141008B (en) * | 2022-07-25 | 2023-09-01 | 河北国亮新材料股份有限公司 | Long-service-life swing groove castable and preparation method thereof |
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