CN115321964A - Iron runner castable and preparation method thereof - Google Patents
Iron runner castable and preparation method thereof Download PDFInfo
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- CN115321964A CN115321964A CN202211029433.0A CN202211029433A CN115321964A CN 115321964 A CN115321964 A CN 115321964A CN 202211029433 A CN202211029433 A CN 202211029433A CN 115321964 A CN115321964 A CN 115321964A
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Abstract
The invention discloses an iron runner castable and a preparation method thereof, and relates to Al 2 O 3 45-65% of fused brown corundum, 5-15% of fused compact corundum, 2-6% of defect spinel, 8-24% of silicon carbide, 1-3% of cement, 1-3% of silicon powder, 1-3% of carbon black, 6-10% of activated alumina micro powder, 1-3% of antioxidant, 1-3% of composite explosion-proof agent and 0.1-0.3% of composite water reducer. The preparation method comprises the following steps: premixing defect spinel and carbon black by using an air flow mill to obtain premixed powder; and uniformly stirring the premixed powder, the fused brown corundum, the fused compact corundum, the silicon carbide, the cement, the silicon micropowder, the activated alumina micropowder, the antioxidant, the composite explosion-proof agent and the composite water reducing agent. The beneficial effects are that: the high-temperature-resistant and corrosion-resistant steel has good high-temperature-resistant scouring performance, slag iron chemical erosion resistance and thermal shock resistance stability, and is simple in production and construction process and long in service life.
Description
Technical Field
The invention relates to the technical field of unshaped refractory materials, in particular to Al 2 O 3 -MA-SiC-C iron runner castable anda preparation method thereof.
Background
The blast furnace tapping runner is a channel for guiding high-temperature molten iron and molten slag to flow in the tapping process of the blast furnace, so that the castable of the blast furnace tapping runner is directly contacted with the high-temperature molten iron and the molten slag in the actual use process, and bears the scouring, abrasion and chemical erosion of the flowing molten iron and the molten slag and the extreme cold and extreme hot temperature change caused by frequent alternate tapping, so that the scouring abrasion, erosion melting loss, stress cracks, permeation and structural damage of the molten iron and the molten slag on the surface layer of a refractory material are caused.
In order to further improve the service performance of the blast furnace tapping channel castable, domestic and foreign scholars improve the service performance of the blast furnace tapping channel castable by optimizing matrix combination.
Greater than 2500m 3 The blast furnace main iron runner castable (patent number CN 201210281186.3) discloses that zinc-aluminum spinel powder, nanoscale zirconium silicate and zirconia hollow spheres are added, and a silica sol suspension is used as a nano binder, so that the thermal shock stability of the castable is improved, but the corresponding production cost is also improved a lot, and the oxidation resistance is not well solved.
Nano Al 2 O 3 SiC film coated carbon Al 2 O 3 -MA-SiC-C refractory castable and preparation method thereof (patent No. CN 101767999A) disclose Al 2 O 3 And SiC film coated with carbon and coated with Al (OH) 3 And Mg (OH) 2 Al made by using composite suspension as nano ceramic bonding agent 2 O 3 the-MA-SiC-C refractory castable improves the oxidation resistance and the slag iron corrosion resistance of materials by producing the spinel through in-situ reaction, but the production process and the site construction process are relatively complex, the amount of the spinel produced through in-situ reaction is difficult to control, and the slag iron corrosion resistance of the castable is not good if the excessive spinel is generated.
Whisker reinforced Al 2 O 3 A process for preparing the-SiC-C iron channel pouring material (CN 110240486A) features that the corundum aggregate, silicon carbide, carbon black, the microcapsule of metallic aluminium powder/ceramic membrane, alpha-alumina powder, silicon powder and calcium aluminate cement are used as raw materials, and the catalyst and water reducer are addedWhisker reinforced Al 2 O 3 The method realizes Al to a certain extent by using the-SiC-C iron runner castable 2 O 3 The erosion resistance and the thermal shock resistance of the-SiC-C castable are improved, but the main defects are that: (1) the production process is complex and the cost is high; (2) The pores inside the casting material are not effectively filled, which has a significant influence on the erosion resistance of the product.
Corrosion-resistant Al 2 O 3 -SiC-C iron runner material and preparation method thereof (patent No. CN 111606695A) disclose that Al is improved by adding kyanite tailings 2 O 3 The method for corrosion resistance and strength of the-SiC-C castable, but has the main defects that: fe in kyanite tailings 2 O 3 High impurity contents such as CaO, mgO and the like, large loss of ignition, and excessive impurity contents can cause the castable to generate a large amount of low-melting substances under the condition of use temperature, thus being unfavorable for the use performance of the material.
Disclosure of Invention
The invention aims to provide Al 2 O 3 an-MA-SiC-C iron runner castable and a preparation method thereof, which are used for overcoming the defects in the prior art.
The technical scheme for solving the technical problems is as follows: al (aluminum) 2 O 3 the-MA-SiC-C iron runner castable comprises the following components in percentage by mass:
45-65% of electric melting brown corundum, 5-15% of electric melting compact corundum, 2-6% of defect spinel, 8-24% of silicon carbide, 1-3% of cement, 1-3% of silicon micropowder, 1-3% of carbon black, 6-10% of active alumina micropowder, 1-3% of antioxidant, 1-3% of composite explosion-proof agent and 0.1-0.3% of composite water reducing agent.
On the basis of the technical scheme, the invention can be further improved as follows.
Further: al in electric smelting brown corundum 2 O 3 More than or equal to 95wt%, wherein the mixture ratio of the aggregate particles in the electric melting brown corundum is as follows: the grain diameter of 5 mm-8 mm accounts for 40% -50% of the fused brown corundum, the grain diameter of 3 mm-5 mm accounts for 30% -40% of the fused brown corundum, and the grain diameter of 1 mm-3 mm accounts for 20% -30% of the fused brown corundum.
Further: al in fused dense corundum 2 O 3 More than or equal to 99wt%, and the mixture ratio of the particles in the fused dense corundum is as follows: the grain diameter of 0.088 mm-1 mm accounts for 40% -60% of the compact corundum, and the grain diameter of 0-0.088 mm accounts for 40% -60% of the compact corundum.
Further: al in defect spinel 2 O 3 The content is more than or equal to 90wt%, mgO is less than or equal to 9wt%, and the granularity is less than or equal to 2 mu m.
Further: siC in the silicon carbide is more than or equal to 97wt%, and the proportion of particles in the silicon carbide is as follows: 40-60% of silicon carbide with the grain diameter of 0.074-1 mm, 20-40% of silicon carbide with the grain diameter of 0.045-0.074 mm and 20-40% of silicon carbide with the grain diameter of 0-0.045 mm.
Further: the cement is pure calcium aluminate cement, wherein Al 2 O 3 More than or equal to 70wt%, caO less than or equal to 30wt% and grain size less than or equal to 10 μm.
Further: the carbon content in the carbon black is more than or equal to 99wt%, and the granularity is less than or equal to 10 mu m.
Further: the antioxidant is formed by mixing two or three of metal silicon powder, silicon carbide and zirconium boride.
Further: the composite explosion-proof agent is formed by mixing two or three of metal aluminum powder, aluminum lactate and explosion-proof fiber; the composite water reducing agent is formed by mixing two or three of trimerization, FDN and polycarboxylic acid high-efficiency water reducing agents.
Based on the technical scheme, the invention also provides Al 2 O 3 The preparation method of the-MA-SiC-C iron runner castable comprises the following steps:
s1, premixing defect spinel and carbon black by an airflow mill to obtain premixed powder;
s2, uniformly stirring the premixed powder, the fused brown corundum, the fused compact corundum, silicon carbide, cement, silicon micro powder, active alumina micro powder, an antioxidant, a composite explosion-proof agent and a composite water reducing agent.
The beneficial effects of the invention are:
1. al prepared by the invention 2 O 3 the-MA-SiC-C iron runner castable adopts defect spinel to replace the traditional aluminum-rich spinelThe spinel contains a small amount of free alpha-Al 2 O 3 And/or free MgO, while the defect spinel is a defect spinel formed by alumina dissolved in spinel to cause lattice distortion, and has high reactivity;
2. al prepared by the invention 2 O 3 the-MA-SiC-C iron runner castable can absorb FeO, mnO and Fe in the slag under the using condition 2 O 3 To form (Mg, fe, mn) (Al, fe) 2 O 4 Solid solution, so that the components of the slag at the material interface are obviously changed, the viscosity of the slag is reduced, the penetration of the slag into the refractory material is delayed, and meanwhile, al of the castable is poured 2 O 3 Forming high-melting-point calcium aluminate ceramic phases such as CA6, CA2 and the like with CaO in the slag, forming a compact ceramic layer at the interface of the refractory material and the slag, and further preventing the slag from permeating the refractory material;
3. the invention introduces novel high-purity carbon black in the preparation process, simultaneously matches with a proper amount of water reducing agent and antioxidant, and improves Al 2 O 3 The carbon content and the slag corrosion resistance of the-MA-SiC-C iron runner castable are high, the softening point of carbon black is high, yellow smoke is not emitted during baking, and the pollution to the environment is reduced;
4. the production process of the invention is to mix the defect spinel and the carbon black in advance, and the defect spinel has small grain diameter and large specific surface activity, so that the defect spinel can be uniformly adsorbed on the surface of the carbon black grains, the carbon black is protected from being oxidized, and the oxidation resistance of the material is improved.
Detailed Description
The principles and features of this invention are described below in conjunction with examples which are set forth to illustrate, but are not to be construed to limit the scope of the invention.
Example 1
Al 2 O 3 the-MA-SiC-C iron runner castable comprises the following components in percentage by mass:
45-55% of electric melting brown corundum, 10-15% of electric melting compact corundum, 2-4% of defect spinel, 18-24% of silicon carbide, 1-3% of cement, 1-3% of silicon micropowder, 1-3% of carbon black, 8-10% of active alumina micropowder, 1-3% of antioxidant, 1-3% of composite explosion-proof agent and 0.1-0.3% of composite water reducing agent.
The preparation method comprises the following steps:
a) Premixing: adding the weighed defect spinel and carbon black into an air flow mill, and premixing the mixture;
b) Weighing: weighing brown corundum, compact corundum, silicon carbide, cement, silicon micropowder, alumina micropowder, antioxidant, explosion-proof agent and water reducer according to the proportion in the technical scheme;
c) Stirring: b, putting the premixed powder in the step a and the raw materials weighed in the step b into a forced stirrer to be stirred for 10-20 min, so that the materials are fully and uniformly mixed;
d) And (3) detection: performing spot inspection on the physical and chemical properties of the stirred materials in the step c;
e) And (3) packaging: and packaging the materials qualified by detection according to the weight requirement and warehousing.
Al prepared in example 1 2 O 3 The detection of the-MA-SiC-C iron runner castable product comprises the following steps:
the volume density of the baked product is more than or equal to 3.00g/cm at 110 ℃ for 24h 3 The compressive strength is more than or equal to 40 MPa, and the breaking strength is more than or equal to 8 MPa; the volume density of the calcined product is more than or equal to 2.90g/cm at 1450 ℃ for 3h 3 The compressive strength is more than or equal to 60 MPa, the breaking strength is more than or equal to 10 MPa, and the linear change rate is 0-0.5%.
Example 2
Al (aluminum) 2 O 3 the-MA-SiC-C iron runner castable comprises the following components in percentage by mass:
50-60% of electric melting brown corundum, 8-12% of electric melting compact corundum, 3-5% of defect spinel, 15-20% of silicon carbide, 1-3% of cement, 1-3% of silicon micropowder, 1-3% of carbon black, 7-9% of active alumina micropowder, 1-3% of antioxidant, 1-3% of composite explosion-proof agent and 0.1-0.3% of composite water reducing agent.
The preparation method comprises the following steps:
a) Pre-mixing: adding the weighed defect spinel and the weighed carbon black into an air flow mill, and premixing the mixture;
b) Weighing: weighing brown corundum, compact corundum, silicon carbide, cement, silicon micropowder, alumina micropowder, antioxidant, explosion-proof agent and water reducer according to the proportion in the technical scheme;
c) Stirring: b, putting the premixed powder in the step a and the raw materials weighed in the step b into a forced stirrer to be stirred for 10-20 min, so that the materials are fully and uniformly mixed;
d) And (3) detection: performing spot inspection on the physical and chemical properties of the stirred materials in the step c;
e) Packaging: and packaging the materials qualified by detection according to the weight requirement and warehousing.
Al prepared in example 2 2 O 3 The detection of the-MA-SiC-C iron runner castable product comprises the following steps:
the volume density of the baked product at 110 ℃ for 24 hours is more than or equal to 3.05g/cm 3 The compressive strength is more than or equal to 50 MPa, and the breaking strength is more than or equal to 12 MPa; the volume density of the product after being burned at 1450 ℃ for 3h is more than or equal to 3.00g/cm 3 The compressive strength is more than or equal to 70 MPa, the flexural strength is more than or equal to 15 MPa, and the linear change rate is 0-0.3%.
Example 3
Al (aluminum) 2 O 3 the-MA-SiC-C iron runner castable comprises the following components in percentage by mass:
55-65% of electric melting brown corundum, 5-10% of electric melting compact corundum, 4-6% of defect spinel, 8-16% of silicon carbide, 1-3% of cement, 1-3% of silicon micropowder, 1-3% of carbon black, 6-8% of active alumina micropowder, 1-3% of antioxidant, 1-3% of composite explosion-proof agent and 0.1-0.3% of composite water reducing agent.
The preparation method comprises the following steps:
a) Premixing: adding the weighed defect spinel and carbon black into an air flow mill, and premixing the mixture;
b) Weighing: weighing brown corundum, compact corundum, silicon carbide, cement, silicon micropowder, alumina micropowder, antioxidant, explosion-proof agent and water reducer according to the proportion in the technical scheme;
c) Stirring: b, putting the premixed powder in the step a and the raw materials weighed in the step b into a forced stirrer to be stirred for 10-20 min, so that the materials are fully and uniformly mixed;
d) And (3) detection: performing spot inspection on the physical and chemical properties of the stirred materials in the step c;
e) And (3) packaging: and packaging the materials qualified by detection according to the weight requirement and warehousing.
Al prepared in example 3 2 O 3 The detection of the-MA-SiC-C iron runner castable product comprises the following steps:
the volume density of the baked product at 110 ℃ for 24 hours is more than or equal to 3.10g/cm 3 The compressive strength is more than or equal to 60 MPa, and the breaking strength is more than or equal to 15 MPa; the volume density of the product after being burned at 1450 ℃ for 3h is more than or equal to 3.05g/cm 3 The compressive strength is more than or equal to 80 MPa, the breaking strength is more than or equal to 20 MPa, and the linear change rate is 0-0.2%.
Although embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are exemplary and not to be construed as limiting the present invention, and that changes, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
Claims (10)
1. Al (aluminum) 2 O 3 the-MA-SiC-C iron runner castable is characterized by comprising the following components in percentage by mass:
45-65% of electric melting brown corundum, 5-15% of electric melting compact corundum, 2-6% of defect spinel, 8-24% of silicon carbide, 1-3% of cement, 1-3% of silicon micropowder, 1-3% of carbon black, 6-10% of active alumina micropowder, 1-3% of antioxidant, 1-3% of composite explosion-proof agent and 0.1-0.3% of composite water reducing agent.
2. An Al according to claim 1 2 O 3 the-MA-SiC-C iron runner castable is characterized in that: al in the electric melting brown corundum 2 O 3 More than or equal to 95wt%, and the mixture ratio of the aggregate particles in the fused brown corundum is as follows: 5 mm-8 mm in diameter accounting for 40% -50% of electro-fused brown corundum, 3 mm-5 mm in diameter accounting for 30% -40% of electro-fused brown corundum, 1 mm-3 mm in diameter accounting for 20%)30％。
3. An Al according to claim 1 2 O 3 the-MA-SiC-C iron runner castable is characterized in that: al in the fused compact corundum 2 O 3 More than or equal to 99wt%, and the mixture ratio of the particles in the fused compact corundum is as follows: the grain diameter of 0.088 mm-1 mm accounts for 40% -60% of the compact corundum, and the grain diameter of 0-0.088 mm accounts for 40% -60% of the compact corundum.
4. Al according to claim 1 2 O 3 the-MA-SiC-C iron runner castable is characterized in that: al in the defect spinel 2 O 3 The content is more than or equal to 90wt percent, the MgO is less than or equal to 9wt percent, and the granularity is less than or equal to 2 mu m.
5. An Al according to claim 1 2 O 3 the-MA-SiC-C iron runner castable is characterized in that: si C in the silicon carbide is more than or equal to 97wt%, and the proportion of particles in the silicon carbide is as follows: 40-60% of silicon carbide with the grain diameter of 0.074-1 mm, 20-40% of silicon carbide with the grain diameter of 0.045-0.074 mm and 20-40% of silicon carbide with the grain diameter of 0-0.045 mm.
6. An Al according to claim 1 2 O 3 the-MA-SiC-C iron runner castable is characterized in that: the cement is pure calcium aluminate cement, wherein Al 2 O 3 More than or equal to 70wt%, caO less than or equal to 30wt% and grain size less than or equal to 10 μm.
7. Al according to claim 1 2 O 3 the-MA-SiC-C iron runner castable is characterized in that: the carbon content in the carbon black is more than or equal to 99wt%, and the granularity is less than or equal to 10 mu m.
8. An Al according to claim 1 2 O 3 the-MA-SiC-C iron runner castable is characterized in that: the antioxidant is formed by mixing two or three of metal silicon powder, silicon carbide and zirconium boride.
9. An Al according to claim 1 2 O 3 the-MA-SiC-C iron runner castable is characterized in that: the composite explosion-proof agent is formed by mixing two or three of metal aluminum powder, aluminum lactate and explosion-proof fiber; the composite water reducing agent is formed by mixing two or three of trimerization, FDN and polycarboxylic acid high-efficiency water reducing agents.
10. Al according to any one of claims 1 to 9 2 O 3 The preparation method of the-MA-SiC-C iron runner castable is characterized by comprising the following steps:
s1, premixing defect spinel and carbon black by using an air flow mill to obtain premixed powder;
s2, uniformly stirring the premixed powder, the fused brown corundum, the fused compact corundum, silicon carbide, cement, silicon micro powder, active alumina micro powder, an antioxidant, a composite explosion-proof agent and a composite water reducing agent.
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| CN111187090A (en) * | 2020-03-10 | 2020-05-22 | 北京利尔高温材料股份有限公司 | Spinel micropowder castable for ladle and method for preparing prefabricated part by using castable |
| CN112266240A (en) * | 2020-10-26 | 2021-01-26 | 湖北斯曼新材料股份有限公司 | Method for synthesizing aluminum-rich spinel by low-temperature solid-phase reaction |
| CN113072364A (en) * | 2021-03-22 | 2021-07-06 | 中冶武汉冶金建筑研究院有限公司 | Lightweight refractory castable for blast furnace swinging chute and preparation method thereof |
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