CN115636670A - Interfacial agent for blast furnace hearth pouring and use method thereof - Google Patents
Interfacial agent for blast furnace hearth pouring and use method thereof Download PDFInfo
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Abstract
The invention relates to the technical field of blast furnace ironmaking, in particular to an interface agent for blast furnace hearth pouring and a use method thereof. The interface agent comprises matrix powder and a composite binder, wherein the matrix powder comprises corundum powder, silicon carbide powder, carbon powder, spherical asphalt, activated alumina micro powder, metal aluminum powder, carbon black, organic fibers and an additive, and the composite binder comprises organic resin and nano silica sol. The interface agent disclosed by the invention can be uniformly applied to the surface of the carbon brick by adopting a spraying mode, does not slump, has the advantages of compressibility, capability of isolating and absorbing water, high thermal conductivity, capability of performing secondary reaction at high temperature so as to improve the strength and the like, can be applied to pouring of waste carbon bricks in blast furnace crucibles, pouring of ceramic cups and the like, and can protect the carbon brick from being corroded by water and influenced by the expansion of a pouring body.
Description
Technical Field
The invention relates to the technical field of blast furnace ironmaking, in particular to an interface agent for blast furnace hearth pouring and a use method thereof.
Background
A method for casting a furnace hearth by utilizing waste carbon bricks of a blast furnace is a very common method for repairing the lining of the furnace hearth at present, and is characterized by high construction efficiency, long service life and environmental protection. The method for making the carbon bricks of the old type is characterized in that in the process of cleaning a hearth, the surfaces of residual carbon bricks are corroded by iron slag, soaked by water and the invalid parts of iron infiltration are removed, the carbon bricks of which the inner layers are not invalid are reserved, then the working layers are restored by adopting an integral pouring mode, and the carbon bricks are put into production after being baked.
At present, most manufacturers directly pour materials after carbon bricks are cleaned, or adopt silica sol to coat a layer of protection on the surfaces of the carbon bricks in order to reduce water, but the water content in the silica sol is still more than 50%; in the baking process after construction, the carbon bricks can still be eroded by water evaporation, and after the carbon bricks on the contact surface of the carbon bricks and a casting body are eroded, the heat transfer efficiency is reduced, so that the service life of a new lining is shortened; the other defect is that the casting body is in direct contact with the old carbon bricks, and the casting body can push the carbon bricks due to high-temperature expansion in the running process of the blast furnace, so that local gas blowby is caused, and even the expansion and cracking of the furnace shell of many blast furnaces occur.
Disclosure of Invention
The invention provides an interfacial agent for blast furnace hearth casting and a using method thereof, which are used for solving the technical problems of the existing method for repairing the hearth lining.
According to the first aspect of the invention, the invention provides an interface agent for blast furnace hearth casting, which comprises matrix powder and a composite binder, wherein the matrix powder comprises corundum powder, silicon carbide powder, carbon powder, ball asphalt, activated alumina micro powder, metal aluminum powder, carbon black, organic fibers and an additive, and the composite binder comprises organic resin and nano silica sol.
In the scheme, the interface agent comprises matrix powder and a composite binder, the composite binder comprises organic resin and nano silica sol, the nano silica sol can improve the spraying performance and the strength of a sprayed material of the interface agent, and the organic resin can reduce the water content. In the matrix powder, the silicon carbide powder, the carbon powder, the ball asphalt and the carbon black belong to raw materials with different particle sizes, have the characteristics of high heat conductivity and high carbonization efficiency, mainly have the effects of improving the heat conductivity of the material, forming carbide by the carbon and the metal aluminum powder at high temperature, improving the bonding strength of a casting body and a carbon brick, and realizing self-compaction of the powder after later-stage compression and high-efficiency heat transfer; the corundum powder and the active alumina micro powder can improve the sintering strength of the material; the metal aluminum powder reacts with steam at low temperature, can consume a part of water, reacts with carbon at high temperature to form a metal plastic phase, can offset expansion, and can provide the strength of an interface agent; the organic fibers provide a compressible space, counteract shrinkage at low temperatures, and provide an expansion space after dissolution at high temperatures. The interface agent has the advantages of good self-flowing performance, high viscosity, strong adhesive force when being sprayed on carbon bricks, quick hardening, high strength, high porosity, high compressibility, good heat-conducting property and the like through the mutual synergistic effect of the components. Aiming at the condition that the worn carbon bricks are irregular in interface cleaning, the interface agent can be uniformly distributed on the surfaces of the carbon bricks in a spraying mode, and comprises concave-convex surfaces, zigzag surfaces, fine seams and the like. After the interface agent is cured, the compressibility of the interface agent can reach 50%, and the stress effect of shrinkage of a casting body on a peripheral material in a normal-temperature curing state can be relieved. The interface agent of the invention contains no more than 3% of bound water, so the erosion of the carbon brick caused by water evaporation is very little. The interface agent of the invention has the advantages that the moisture is completely evaporated and completely carbonized at the temperature of 250 ℃, the comprehensive porosity of the carbonized material can reach 50 percent, and the expansion stress effect of a later-stage casting body can be effectively relieved. In addition, the interface agent of the invention is carbon powder after carbonization, the carbon powder is compacted after high-temperature compression, and is actually a carbon brick, for example, in the raw materials selected by the material, organic resin is carbonized into carbon powder, ball asphalt, carbon powder, carbon black and organic fiber, and all volatile matters are volatilized to become the carbon powder.
In one possible design, the composition comprises the following components in parts by weight: 100 parts of matrix powder and 20-30 parts of composite binder.
Preferably, the composition comprises the following components in parts by weight: 100 parts of matrix powder and 25 parts of composite binder.
Understandably, by limiting the component ratio of the matrix powder and the composite binder, while the interface agent is ensured to be capable of effectively solving the technical problems existing in the existing method for repairing the hearth lining, the spraying performance and the strength of the spraying material of the interface agent can be improved, the construction efficiency is improved, the water content is reduced, and the erosion of water evaporation to the carbon brick is further reduced.
In one possible design, the matrix powder comprises the following components in parts by weight: 10-15 parts of corundum powder, 40-45 parts of silicon carbide powder, 15-20 parts of carbon powder, 5-10 parts of ball asphalt, 5-8 parts of active alumina micropowder, 8-12 parts of metal aluminum powder, 2-5 parts of carbon black, 1-1.5 parts of organic fiber and 2-3 parts of additive.
Preferably, the matrix powder comprises the following components in parts by weight: 15 parts of corundum powder, 40 parts of silicon carbide powder, 15 parts of carbon powder, 10 parts of ball asphalt, 5 parts of active alumina micro powder, 10 parts of metal aluminum powder, 2 parts of carbon black, 1 part of organic fiber and 2 parts of additive.
It can be understood that by limiting the ratio of the raw materials in the matrix powder to a reasonable range, better synergy between the raw materials can be achieved, and the effects of the raw materials can be better exerted.
In one possible design, the organic fibers are hollow organic fibers having a melting point of 75 ℃ to 85 ℃, preferably 80 ℃.
It can be understood that by defining the organic fibers as hollow organic fibers, a compressible space can be provided more effectively, and the effect of counteracting shrinkage at low temperatures and providing an expansion space after dissolution at high temperatures can be better achieved. Further, the melting point of the limited fiber is limited within a proper range, so that the effects of counteracting shrinkage at low temperature and providing an expansion space after dissolution at high temperature can be more effectively realized.
In one possible design, the organic fibers are selected from polypropylene fibers having a void fraction of 45% to 55%. Preferably, the hollow ratio is 50%.
Understandably, the effect of counteracting shrinkage at low temperature and providing expansion space after dissolution at high temperature can be more effectively realized by reasonably selecting the hollow rate of the organic fibers.
In one possible design, the corundum powder has a mesh size of 150-250 meshes, preferably 200 meshes; the mesh number of the silicon carbide powder is 300-325 meshes, preferably 325 meshes; the particle size of the spherical asphalt is more than 0.088mm and less than or equal to 1mm; the particle size of the active alumina micro powder is 0.5-1.5 μm, preferably 1 μm; the mesh number of the metal aluminum powder is 80-120 meshes, preferably 120 meshes; the particle size of the carbon black is 4-6 μm, preferably 5 μm; the additive is a compound comprising a water reducing agent, an accelerating agent and a dispersing agent.
In one possible design, the composite binder comprises the following components in parts by weight: 65-75 parts of organic resin and 25-35 parts of nano silica sol. Preferably, the complex binder comprises the following components: 70 parts of organic resin and 30 parts of nano silica sol.
In one possible design, the organic resin is selected from the group consisting of phenolic resins; the nano silica sol is selected from SiO 2 30-40% of silica sol with the grain diameter of 10-30 nm. Preferably, siO 2 The content is 35%.
It can be understood that the selected organic resins are all low-temperature carbonizable resins, carbon powder is formed by carbonization at about 200 ℃, and carbon forms carbide with metal powder at high temperature, so that the bonding strength of the casting body and the carbon brick is improved. By SiO of nano silica sol 2 The limit of the content and the grain diameter can better improve the spraying performance and the strength of the spraying material of the interface agent.
In a second aspect of the present invention, the present invention further provides a preparation method of the above interfacial agent, comprising the following steps:
and (2) dry-mixing corundum powder, silicon carbide powder, carbon powder, ball asphalt, activated alumina micro powder, metal aluminum powder, carbon black, organic fiber and an additive for 20-40 s, preferably 30s, to obtain matrix powder.
Adding organic resin into the matrix powder, stirring for 80-100 s, preferably 90s, adding the nano silica sol, and stirring for 80-100 s, preferably 90s to obtain the interface agent.
In the scheme, corundum powder, silicon carbide powder, carbon powder, pitch, activated alumina micro powder, metal aluminum powder, carbon black, organic fiber and an additive are dry-mixed for 20-40 s to obtain matrix powder, and the process is to prevent internal segregation of the matrix material in the transportation process and is more uniform after dry mixing. And adding organic resin into the matrix powder, and stirring for 80-100 s to ensure that the organic resin wraps the metal aluminum powder to form a layer of oil film on the surface of the powder, so as to reduce the reaction of the metal aluminum powder and the water in the nano silica sol at normal temperature.
In a third aspect of the invention, the invention also provides a use method of the interface agent, wherein the interface agent is sprayed on the surface of the carbon brick by adopting a spraying mode and then naturally cured.
In the scheme, the use method of the interface agent is to spray the interface agent on the surface of the carbon brick in a spraying mode and then naturally maintain, so that the interface agent is a material which is between the shaped brick and the unshaped castable and is in stable transition, and the interface agent can absorb water vapor and does not retain water to form a stable state in the pouring and baking process of the blast furnace hearth, thereby being convenient for later-stage operation and use. The interfacial agent formed on the surface of the carbon brick solves the problem that the carbon brick is corroded by moisture and the problem that the carbon brick is not combined with the casting body, solves the problem that the casting body expands at high temperature to push the carbon brick, and can effectively transfer the temperature conduction between the carbon brick and the casting body. The construction of the interface agent is carried out by adopting a spraying mode, so that the coating is uniform, free of dead angles, simple and rapid. Compared with the prior art, the method adopts a similar interface agent, but adopts a smearing mode, so that dead corners exist on the surface of the irregular carbon brick, and the material does not contain metal aluminum powder and organic fibers, so that the effects of absorbing moisture and being compressible cannot be achieved.
In one possible design, the spraying pressure used by the spraying mode is 0.2MPa-0.3MPa, and the spraying thickness is 4.5mm-5.5mm; the natural curing time is 0.5h-1.5h, preferably 1h.
In the using method of the interface agent, the spraying mode adopts the spraying pressure of 0.2MPa-0.3MPa, the spraying thickness is 4.5mm-5.5mm, the interface agent can be uniformly distributed on the surface and in the gap of the carbon brick to form an effective interface layer, the direct contact between the castable and the carbon brick is prevented, the carbon brick is protected from being corroded by moisture, and the stress action of a high-temperature castable on the carbon brick is relieved. Further, the natural curing time is limited within a reasonable range, so that the interfacial agent can be more stably formed on the carbon brick. The spraying thickness of the invention is 4.5mm-5.5mm, not only plays a role of isolating moisture, but also can offset expansion at high temperature.
The invention provides an interface agent for blast furnace hearth casting, which comprises matrix powder and a composite binder, wherein the matrix powder comprises corundum powder, silicon carbide powder, carbon powder, spherical asphalt, activated alumina micro powder, metal aluminum powder, carbon black, organic fiber and an additive, and the composite binder comprises organic resin and nano silica sol. The nano silica sol can improve the spraying performance and the strength of the spraying material of the interface agent, and the organic resin can reduce the water content. In the matrix powder, the silicon carbide powder, the carbon powder, the ball asphalt and the carbon black belong to raw materials with different particle sizes, have the characteristics of high heat conductivity and high carbonization efficiency, mainly have the effects of improving the heat conductivity of the material, forming carbide by the carbon and the metal aluminum powder at high temperature, improving the bonding strength of a casting body and a carbon brick, and realizing self-compaction of the powder after later-stage compression and high-efficiency heat transfer; the corundum powder and the active alumina micro powder can improve the sintering strength of the material; the metal aluminum powder reacts with steam at low temperature, can consume a part of water, reacts with carbon at high temperature to form a metal plastic phase, can offset expansion, and can improve the strength of an interfacial agent; the organic fibers provide a compressible space, counteract shrinkage at low temperatures, and provide an expansion space after dissolution at high temperatures.
The use method of the interface agent for blast furnace hearth pouring provided by the invention adopts a spraying mode to spray the interface agent on the surface of the carbon brick, and then natural curing is carried out, so that the interface agent is a material which is between the shaped brick and the unshaped castable and is in stable transition, and the interface agent can absorb water vapor and does not retain water to form a stable state in the blast furnace hearth pouring and baking process, thereby being convenient for later-stage operation and use. The interfacial agent formed on the surface of the carbon brick solves the problem that the carbon brick is corroded by moisture and the problem that the carbon brick is not combined with the casting body, solves the problem that the casting body expands at high temperature to push the carbon brick, and can effectively transfer the temperature conduction between the carbon brick and the casting body. The spraying mode is adopted for the construction of the interface agent, so that the coating is uniform, free of dead angles, simple and rapid.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below, and it should be apparent that the described embodiments are some, but not all, embodiments of the present invention. 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 embodiment provides an interface agent for blast furnace hearth casting, which comprises 100 parts of matrix powder and 25 parts of composite binder. Wherein 100 parts of matrix powder comprises 15 parts of corundum powder (200 meshes), 40 parts of silicon carbide powder (325 meshes), 15 parts of carbon powder, 10 parts of ball asphalt (the particle size is more than 0.088mm and less than or equal to 1 mm), 5 parts of activated alumina micro powder (1 mu m), 10 parts of metal aluminum powder (120 meshes), 2 parts of carbon black (5 mu m), 1 part of organic fiber and 2 parts of additive, the organic fiber is hollow organic fiber, the melting point is 80 ℃, and specifically is polypropylene fiber with the hollow rate of 50%. The composite binder comprises organic resin and nano silica sol, wherein the organic resin is specifically phenolic resin. The nano silica sol is SiO 2 35 percent of silica sol with the grain diameter of 10nm-30 nm. The composite binder comprises 70% of organic resin and 30% of nano silica sol.
The preparation method of the interface agent comprises the following steps:
and dry-mixing corundum powder, silicon carbide powder, carbon powder, ball asphalt, active alumina micro powder, metal aluminum powder, carbon black, organic fiber and an additive for 30s to obtain matrix powder.
And adding organic resin into the matrix powder, stirring for 90s, then adding the nano silica sol, and stirring for 90s to obtain the interface agent.
Example 2
The difference from the example 1 is that the interface agent comprises 100 parts of matrix powder and 25 parts of composite binder. Wherein 100 parts of matrix powder comprises 15 parts of corundum powder (200 meshes), 40 parts of silicon carbide powder (325 meshes), 10 parts of carbon powder and 5 parts of ball asphalt (the particle size is more than 0.088mm and less than or equal to 1 m)m), 15 parts of activated alumina micro powder (1 mu m), 10 parts of metal aluminum powder (120 meshes), 2 parts of carbon black (5 mu m), 1 part of organic fiber and 2 parts of additive, wherein the organic fiber is hollow organic fiber, the melting point is 80 ℃, and specifically is polypropylene fiber with the hollow rate of 50%. The composite binder comprises organic resin and nano silica sol, wherein the organic resin is specifically phenolic resin. The nano silica sol is specifically SiO 2 35 percent of silica sol with the grain diameter of 10nm-30 nm. The composite binder comprises 70% of organic resin and 30% of nano silica sol.
Example 3
The difference from the example 1 is that the interface agent comprises 100 parts of matrix powder and 25 parts of composite binder. Wherein 100 parts of matrix powder comprises 25 parts of corundum powder (200 meshes), 35 parts of silicon carbide powder (325 meshes), 10 parts of carbon powder, 10 parts of ball asphalt (the particle size is more than 0.088mm and less than or equal to 1 mm), 5 parts of activated alumina micro powder (1 mu m), 10 parts of metal aluminum powder (120 meshes), 2 parts of carbon black (5 mu m), 1 part of organic fiber and 2 parts of additive, the organic fiber is hollow organic fiber, the melting point is 80 ℃, and specifically is polypropylene fiber with the hollow rate of 50%. The composite binder comprises organic resin and nano silica sol, wherein the organic resin is specifically phenolic resin. The nano silica sol is SiO 2 35 percent of silica sol with the grain diameter of 10nm-30 nm. The composite binder comprises 70% of organic resin and 30% of nano silica sol.
Example 4
The difference from the example 1 is that the interface agent comprises 100 parts of matrix powder and 40 parts of composite binder. Wherein 100 parts of matrix powder comprises 15 parts of corundum powder (200 meshes), 40 parts of silicon carbide powder (325 meshes), 15 parts of carbon powder, 10 parts of ball asphalt (the particle size is more than 0.088mm and less than or equal to 1 mm), 5 parts of activated alumina micro powder (1 mu m), 10 parts of metal aluminum powder (120 meshes), 2 parts of carbon black (5 mu m), 1 part of organic fiber and 2 parts of additive, the organic fiber is hollow organic fiber, the melting point is 80 ℃, and specifically is polypropylene fiber with the hollow rate of 50%. The composite binder comprises organic resin and nano silica sol, wherein the organic resin is specifically phenolic resin. The nano silica sol is specifically SiO 2 35 percent of silica sol with the grain diameter of 10nm-30 nm. Composite binderComprises 70 percent of organic resin and 30 percent of nano silica sol.
Comparative example 1
The difference from example 1 is that the interface agent does not contain organic fibers.
Comparative example 2
The difference from the example 1 is that the interface agent does not contain metal aluminum powder.
Comparative example 3
The difference from the example 1 is that the interface agent does not contain organic fiber and metal aluminum powder.
Comparative example 4
The difference from example 1 is that the interface agent uses a single organic resin as a binder.
Comparative example 5
The difference from example 1 is that the interface agent uses a single nano silica sol as a binder.
Comparative example 6
The difference from example 1 is that the interface agent comprises 100 parts of matrix powder and 25 parts of a single binder. Wherein 100 parts of matrix powder comprises 5 parts of corundum powder (200 meshes), 45 parts of silicon carbide powder (325 meshes), 20 parts of carbon powder, 10 parts of ball asphalt (the particle size is more than 0.088mm and less than or equal to 1 mm), 5 parts of activated alumina micro powder (1 mu m), 10 parts of metal aluminum powder (120 meshes), 2 parts of carbon black (5 mu m), 1 part of organic fiber and 2 parts of additive, the organic fiber is hollow organic fiber, the melting point is 80 ℃, and specifically is polypropylene fiber with the hollow rate of 50%. The single binder comprises 25 parts of phenolic resin.
Comparative example 7
The comparative example provides an interfacial agent for blast furnace hearth casting in the existing market, and the formula of the interfacial agent is as follows: comprises 100 parts of matrix powder and 20 parts of phenolic resin. Wherein 100 parts of matrix powder comprises 50 parts of silicon carbide powder (200 meshes and 325 meshes), 30 parts of carbon powder, 10 parts of activated alumina micro powder (1 mu m), 5 parts of carbon black (5 mu m) and 5 parts of additive.
The interfacial agents obtained in the examples and comparative examples 2 to 4 and 1 to 6 were sprayed on the surface of the carbon brick by a spraying method under a spraying pressure of 0.2MPa to 0.3MPa to a thickness of 5mm, and then naturally cured for 1 hour to form an interfacial film on the surface of the carbon brick, and the interfacial agent obtained in comparative example 7 was applied on the surface of the carbon brick by a coating method to form an interfacial film, and then performance tests were respectively performed, and the results are shown in table 1 below.
The test method of the self-flow value is as follows: after the materials are stirred, one kilogram of the materials is put into a special die, and the diameter of the autonomous flow range of the interfacial agent within 1min is tested after the die is taken off, namely the self-flow value.
The hardening time was measured as follows: the curing time is the time for which the interface agent can be demoulded (not collapsed) after being stirred uniformly and molded.
The strength was tested as follows: the test block is baked and cooled at 300 ℃ and then has a compressive strength value.
The porosity was measured as follows: after baking at 300 ℃, soaking the test block in water for 3h, and obtaining the product of the water absorption and the volume density value as the porosity.
Compressibility was tested as follows: after being baked at 300 ℃ and bearing the pressure of 3MPa for 5min, the ratio of the compressed thickness of the test block to the thickness before testing is the compression ratio.
The method for testing the heat conductivity coefficient of the compacted test block comprises the following steps: after the test block is baked at 300 ℃, the test block is subjected to 3MPa of pressure for 30min to be compacted, and then the heat conductivity coefficient is detected by adopting a standard detection method.
TABLE 1 Performance Table of interfacial agents for examples and comparative examples
As can be seen from the data in Table 1, the interfacial film is formed on the surface of the carbon brick by using the interfacial agent of the invention in a spraying manner, the obtained interfacial film has a maximum self-flow value of 175mm, a minimum hardening time of 12min, a maximum strength of 0.65MPa, a porosity of 50%, a compressibility of 50%, and a thermal conductivity of 12.0W/K.m after the test block has a pressed density, wherein the interfacial agent of the embodiment 1 has the optimal performance and simultaneously satisfies the following requirements: the self-flow value is more than 150mm, the hardening time is less than 15min, the strength is more than 0.2MPa, the porosity is more than 50%, the compressibility is more than 45%, and the heat conductivity coefficient after the test block is compacted is more than 10W/K.m, which shows that the interface agent has the advantages of good self-flow property, quick hardening, high strength, high porosity, high compressibility and good heat conductivity, so that the construction is simple and convenient, the efficiency is high, the problem that the carbon brick is corroded by moisture and the carbon brick is not combined with a casting body can be effectively solved, the problem that the carbon brick is pushed by the high-temperature expansion of the casting body is solved, and the temperature conduction between the carbon brick and the casting body can be effectively transmitted.
Compared with the example 1, the amount of the activated alumina micro powder in the matrix powder in the example 2 is three times of that in the example 1, the obtained interface agent has no great difference in the self-flow value, the hardening time and the strength, but the porosity, the compressibility of the interface film and the thermal conductivity coefficient after the test block is compacted are obviously reduced, which shows that the amount of the activated alumina micro powder in the interface agent needs to be controlled within a reasonable range to enable the interface agent to have high porosity, compressibility of the interface film and excellent thermal conductivity coefficient.
Compared with the example 1, the amount of the corundum powder in the example 3 is relatively high (= 25 parts), the amount of the silicon carbide is relatively low (< 40 parts), the amount of the carbon powder is relatively low (< 15 parts), the self-flow value of the obtained interface agent is reduced, the hardening time is slightly improved, the strength is slightly improved, but the porosity, the compressibility of the interface film and the thermal conductivity coefficient after the test block is compacted are obviously reduced, which shows that the amount ratio of the raw materials in the matrix powder in the interface agent needs to be controlled within a reasonable range to enable the interface agent to show high porosity, compressibility of the interface film and excellent thermal conductivity coefficient.
Compared with example 1, the amount of the composite binder in example 4 is significantly increased (= 40 parts > 30 parts), the self-flowing value of the obtained interface agent is improved, the hardening time is significantly increased, the collapse is easy, the strength and the thermal conductivity coefficient after the test block is compacted are significantly reduced, but the difference between the porosity and the interfacial film compressibility is small, which indicates that the amount of the composite binder in the interface agent needs to be controlled within a reasonable range to enable the interface agent to show low hardening time, high strength and excellent thermal conductivity coefficient.
In conclusion, the proportion of the raw materials in the interface agent is limited within a reasonable range, so that better synergistic effect among the raw materials can be achieved, the functions of the raw materials can be better exerted, and the interface agent with better performance can be prepared.
It can be seen from the experimental results of example 1 and comparative examples 1-3 that the organic fiber and the metal aluminum powder play an important role in the interface agent of the present invention, the organic fiber can effectively increase the porosity and the compressibility of the interface agent, provide a compressible space, counteract shrinkage at low temperature, and provide an expansion space after dissolution at high temperature. The metal aluminum powder can effectively improve the strength, porosity and interface compressibility of the interface agent and reduce hardening time.
As can be seen from the experimental results of the embodiment 1 and the comparative examples 4 to 6, the invention adopts the organic resin and the nano silica sol as the composite binder, so that the comprehensive performance of the interfacial agent is better, and the organic resin is singly adopted as the binder, so that the hardening time of the interfacial film is too long, the strength is too low, and the collapse is easy to occur. The nano silica sol is singly used as a bonding agent, and the porosity, the interface compressibility and the heat conductivity coefficient are reduced after the test block is compacted.
Compared with the construction by using the interface agent commonly used in the market and adopting a coating mode, the construction method disclosed by the invention adopts the interface agent with a special composition and a spraying mode, so that the obtained interface film has the advantages of higher self-flow value, shorter hardening time, higher strength, higher porosity and compressibility and is more favorable for the pouring of a blast furnace hearth.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. The interfacial agent for blast furnace hearth casting is characterized by comprising matrix powder and a composite binder, wherein the matrix powder comprises corundum powder, silicon carbide powder, carbon powder, spherical asphalt, activated alumina micro powder, metal aluminum powder, carbon black, organic fiber and an additive, and the composite binder comprises organic resin and nano silica sol.
2. The interface agent according to claim 1, comprising the following components in parts by weight: 100 parts of matrix powder and 20-30 parts of composite binder.
3. The interfacial agent according to claim 1 or 2, wherein said matrix powder comprises the following components in parts by weight: 10-15 parts of corundum powder, 40-45 parts of silicon carbide powder, 15-20 parts of carbon powder, 5-10 parts of ball asphalt, 5-8 parts of active alumina micropowder, 8-12 parts of metal aluminum powder, 2-5 parts of carbon black, 1-1.5 parts of organic fiber and 2-3 parts of additive.
4. The interfacial agent according to claim 1, wherein said organic fiber is a hollow organic fiber having a melting point of 75 ℃ to 85 ℃.
5. The interfacial agent according to claim 4, wherein said organic fiber is selected from polypropylene fiber having a void fraction of 45% to 55%.
6. The interface agent according to claim 1, wherein the corundum powder has a mesh size of 150-250 meshes; the mesh number of the silicon carbide powder is 300-325 meshes; the particle size of the spherical asphalt is more than 0.088mm and less than or equal to 1mm; the particle size of the active alumina micro powder is 0.5-1.5 μm; the mesh number of the metal aluminum powder is 80-120 meshes; the particle size of the carbon black is 4-6 μm; the additive is a compound comprising a water reducing agent, an accelerating agent and a dispersing agent.
7. The interface agent according to claim 1 or 2, wherein the composite binder comprises the following components in parts by weight: 65-75 parts of organic resin and 25-35 parts of nano silica sol.
8. The interfacial agent according to claim 1, wherein said organic resin is selected from the group consisting of phenolic resins; the nano silica sol is selected from SiO 2 30-40% of silica sol with the grain diameter of 10-30 nm.
9. The use method of the interface agent according to any one of claims 1 to 8, wherein the interface agent is sprayed on the surface of the carbon brick by a spraying method and then naturally cured.
10. The use method of claim 9, wherein the spraying mode uses a spraying pressure of 0.2MPa-0.3MPa and a spraying thickness of 4.5mm-5.5mm; the natural curing time is 0.5h-1.5h.
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| CN202211660426.0A Active CN115636670B (en) | 2022-12-23 | 2022-12-23 | Interfacial agent for blast furnace hearth pouring and use method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117902909A (en) * | 2024-03-19 | 2024-04-19 | 阳城县圣利安建材有限公司 | Flint clay brick and manufacturing method |
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| WO2021238029A1 (en) * | 2020-05-29 | 2021-12-02 | 郑州市瑞沃耐火材料有限公司 | High-thermal-conductivity molten iron trough castable |
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| CN102531655A (en) * | 2012-03-06 | 2012-07-04 | 长兴煤山新型炉料有限公司 | ASC self-flow main channel castable |
| CN102557697A (en) * | 2012-03-15 | 2012-07-11 | 长兴明天炉料有限公司 | Pouring material and single-iron notch blast furnace iron storage type tapping main channel using same |
| CN103664211A (en) * | 2013-12-12 | 2014-03-26 | 常州苏瑞纳碳科技有限公司 | Castable for blast-furnace tapping channel and preparation method thereof |
| CN107226687A (en) * | 2016-03-23 | 2017-10-03 | 上海宝钢工业技术服务有限公司 | Castable for blast furnace lining spray repair and preparation method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117902909A (en) * | 2024-03-19 | 2024-04-19 | 阳城县圣利安建材有限公司 | Flint clay brick and manufacturing method |
| CN117902909B (en) * | 2024-03-19 | 2024-06-11 | 阳城县圣利安建材有限公司 | Flint clay brick and manufacturing method |
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| CN115636670B (en) | 2023-03-31 |
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