CN115322001B - High-temperature-resistant iron runner castable and preparation method thereof - Google Patents
High-temperature-resistant iron runner castable and preparation method thereof Download PDFInfo
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- CN115322001B CN115322001B CN202211123172.9A CN202211123172A CN115322001B CN 115322001 B CN115322001 B CN 115322001B CN 202211123172 A CN202211123172 A CN 202211123172A CN 115322001 B CN115322001 B CN 115322001B
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Abstract
The invention discloses a high-temperature-resistant iron runner castable and a preparation method thereof, belonging to the technical field of castable, and comprising the following raw materials in parts by weight: 40-60 parts of refractory clay tailings, 3-5 parts of mullite fiber, 10-15 parts of nano zirconium silicide, 20-30 parts of brown corundum, 2-4 parts of cement, 1-3 parts of water glass, 0.5-1.5 parts of sodium tripolyphosphate, 2-4 parts of antioxidant, 1-2 parts of explosion-proof agent and 0.1-0.5 part of water reducer. The high-temperature-resistant iron runner castable disclosed by the invention has the advantages of high temperature resistance, erosion resistance, scouring resistance, permeation resistance, excellent thermal shock resistance, sufficient thermal conductivity and long service life.
Description
Technical Field
The invention relates to the technical field of castable, in particular to a high-temperature-resistant iron runner castable and a preparation method thereof.
Background
The blast furnace tapping channel is used as a part of blast furnace production, and is a necessary channel for molten iron to flow from the interior of the blast furnace to the molten iron tank through the tap hole, so that the service life of the tapping channel is directly related to whether the Gao Lusheng capacity is normally and orderly carried out, the tapping channel castable is an important component material for manufacturing the blast furnace tapping channel, and the service life of the tapping channel castable is directly determined by the service life of the tapping channel, so that the production capacity and the efficiency of the blast furnace are determined.
The existing iron runner castable has the defects of high temperature resistance, erosion resistance, scouring resistance, permeation resistance, thermal shock resistance or insufficient thermal conductivity and short service life. As disclosed in patent CN200910092570.7, sodium tripolyphosphate or sodium hexametaphosphate is added as a dispersing agent, and explosion-proof organic fibers and the like are added to obtain an iron runner castable, the compressive strength of the castable is 17.3MPa after being dried at 110 ℃, 32.8MPa after being kept at 1400 ℃ for 4 hours, and 43.5MPa after being kept at 1480 ℃ for 4 hours; the flexural strength of the castable is 2.0MPa after being dried at 110 ℃, 4.7MPa after being kept at 1400 ℃ for 4 hours, and 6.8MPa after being kept at 1480 ℃ for 4 hours, and the requirement of the existing blast furnace smelting technology on large-scale development is not met. Another example is the patent number: CN 101767999A' nano Al 2 O 3 Al of SiC film coated carbon 2 O 3 The technology of MA-SiC-C refractory castable and its preparation process is disclosed with Al 2 O 3 And SiC film wrapped with carbon and coated with Al (OH) 3 And Mg (OH) 2 Al prepared by using composite suspension as nano ceramic bonding agent 2 O 3 Producing spinel by in situ reaction of MA-SiC-C refractory castable,the oxidation resistance and the slag iron erosion resistance of the material are improved, but the production process and the site construction process are complex, the amount of spinel produced by in-situ reaction is difficult to control, and if spinels are excessively produced, the slag iron resistance of the castable is unfavorable.
Therefore, the high-temperature-resistant iron runner castable with high temperature resistance, erosion resistance, scouring resistance, permeation resistance, excellent thermal shock resistance, sufficient thermal conductivity and long service life and the preparation method thereof are developed, meet the market demand, have wide market value and application prospect, and have very important significance for promoting the production capacity and efficiency of the blast furnace.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide the high-temperature-resistant iron runner castable with excellent high-temperature resistance, erosion resistance, scouring resistance, permeation resistance and thermal shock resistance, sufficient thermal conductivity and long service life and the preparation method thereof.
In order to achieve the above purpose, the invention adopts the following technical scheme: the high-temperature-resistant iron runner castable is characterized by comprising the following raw materials in parts by weight: 40-60 parts of refractory clay tailings, 3-5 parts of mullite fiber, 10-15 parts of nano zirconium silicide, 20-30 parts of brown corundum, 2-4 parts of cement, 1-3 parts of water glass, 0.5-1.5 parts of sodium tripolyphosphate, 2-4 parts of antioxidant, 1-2 parts of explosion-proof agent and 0.1-0.5 part of water reducer.
Preferably, the water reducing agent is at least one of a polycarboxylic acid high efficiency water reducing agent, sodium lignin sulfonate and sulfonate-based copolymer.
Preferably, the method for preparing the sulfonate-based copolymer comprises the following steps: adding 2-acrylamido-2-methylpropanesulfonic acid, 2-adamantyl acrylate, 2,3,4,5, 6-pentafluorostyrene and an initiator into a high-boiling point solvent, stirring and reacting for 3-5 hours at 60-70 ℃ in a nitrogen atmosphere, and removing the solvent by rotary evaporation to obtain the sulfonate-based copolymer.
Preferably, the mass ratio of the 2-acrylamido-2-methylpropanesulfonic acid, the 2-adamantyl acrylate, the 2,3,4,5, 6-pentafluorostyrene, the initiator and the high-boiling point solvent is (5-7): (0.8-1.2): 0.5 (0.06-0.09): (30-40).
Preferably, the initiator is at least one of azodiisobutyronitrile and azodiisoheptonitrile; the high boiling point solvent is at least one of dimethyl sulfoxide and N, N-dimethylformamide.
Preferably, the explosion-proof agent is at least one of metal aluminum powder and aluminum lactate.
Preferably, the antioxidant is at least one of metal silicon powder, boron carbide and zirconium boride.
Preferably, the cement is a PP52.5 pozzolanic portland cement.
Preferably, the brown fused alumina is fused brown alumina, wherein Al in the fused brown alumina 2 O 3 More than or equal to 95 percent and C less than or equal to 0.08 percent, and is divided into three granularity grades of 8-5 mm, 5-3 mm and 3-1 mm, and the corresponding mass ratio of the three granularity grades is (35-47): (25-30) and (28-35).
Preferably, the particle size of the nano zirconium silicide is 50-80nm.
Preferably, the mullite fiber has a diameter of 1-3 μm and an aspect ratio of (15-20): 1.
Preferably, the refractory clay tailings are at least one of sillimanite, soft clay tailings and high alumina alum.
Preferably, the refractory clay tailings have a particle size of 100-300 mesh.
The invention further provides a preparation method of the high-temperature-resistant iron runner castable, which comprises the following steps: weighing the raw materials according to the proportion, dry-mixing uniformly, adding water, and stirring for 4-6 minutes to obtain a mixed material; pouring the mixed materials into a mold, vibrating, curing and baking to obtain the high-temperature-resistant iron runner castable.
Preferably, the water is added in an amount of 4.2 to 6.5wt% based on the total mass of the raw materials.
Detailed Description
The following detailed description of the preferred embodiments of the present invention will be provided in connection with.
The high-temperature-resistant iron runner castable is characterized by comprising the following raw materials in parts by weight: 40-60 parts of refractory clay tailings, 3-5 parts of mullite fiber, 10-15 parts of nano zirconium silicide, 20-30 parts of brown corundum, 2-4 parts of cement, 1-3 parts of water glass, 0.5-1.5 parts of sodium tripolyphosphate, 2-4 parts of antioxidant, 1-2 parts of explosion-proof agent and 0.1-0.5 part of water reducer.
Preferably, the water reducing agent is at least one of a polycarboxylic acid high efficiency water reducing agent, sodium lignin sulfonate and sulfonate-based copolymer.
Preferably, the method for preparing the sulfonate-based copolymer comprises the following steps: adding 2-acrylamido-2-methylpropanesulfonic acid, 2-adamantyl acrylate, 2,3,4,5, 6-pentafluorostyrene and an initiator into a high-boiling point solvent, stirring and reacting for 3-5 hours at 60-70 ℃ in a nitrogen atmosphere, and removing the solvent by rotary evaporation to obtain the sulfonate-based copolymer.
Preferably, the mass ratio of the 2-acrylamido-2-methylpropanesulfonic acid, the 2-adamantyl acrylate, the 2,3,4,5, 6-pentafluorostyrene, the initiator and the high-boiling point solvent is (5-7): (0.8-1.2): 0.5 (0.06-0.09): (30-40).
Preferably, the initiator is at least one of azodiisobutyronitrile and azodiisoheptonitrile; the high boiling point solvent is at least one of dimethyl sulfoxide and N, N-dimethylformamide.
Preferably, the explosion-proof agent is at least one of metal aluminum powder and aluminum lactate.
Preferably, the antioxidant is at least one of metal silicon powder, boron carbide and zirconium boride.
Preferably, the cement is a PP52.5 pozzolanic portland cement.
Preferably, the brown fused alumina is fused brown alumina, wherein Al in the fused brown alumina 2 O 3 More than or equal to 95 percent and C less than or equal to 0.08 percent, and is divided into three granularity grades of 8-5 mm, 5-3 mm and 3-1 mm, and the corresponding mass ratio of the three granularity grades is (35-47): (25-30) and (28-35).
Preferably, the particle size of the nano zirconium silicide is 50-80nm.
Preferably, the mullite fiber has a diameter of 1-3 μm and an aspect ratio of (15-20): 1.
Preferably, the refractory clay tailings are at least one of sillimanite, soft clay tailings and high alumina alum.
Preferably, the refractory clay tailings have a particle size of 100-300 mesh.
The invention further provides a preparation method of the high-temperature-resistant iron runner castable, which comprises the following steps: weighing the raw materials according to the proportion, dry-mixing uniformly, adding water, and stirring for 4-6 minutes to obtain a mixed material; pouring the mixed materials into a mold, vibrating, curing and baking to obtain the high-temperature-resistant iron runner castable.
Preferably, the water is added in an amount of 4.2 to 6.5wt% based on the total mass of the raw materials.
Due to the application of the technical scheme, compared with the prior art, the invention has the following advantages: the high-temperature-resistant iron runner castable provided by the invention has the advantages of high temperature resistance, erosion resistance, scouring resistance, permeation resistance, excellent thermal shock resistance, sufficient thermal conductivity and long service life. The preparation method of the high-temperature-resistant iron runner castable provided by the invention has the advantages of simple process, convenience and practicability in operation, small equipment dependence, high preparation efficiency and high finished product qualification rate, and is suitable for continuous large-scale production.
The invention will be further described with reference to specific examples, but the scope of the invention is not limited thereto:
example 1
The example provides a high-temperature-resistant iron runner castable which is characterized by comprising the following raw materials in parts by weight: 40 parts of refractory clay tailings, 3 parts of mullite fibers, 10 parts of nano zirconium silicide, 20 parts of brown alumina, 2 parts of cement, 1 part of water glass, 0.5 part of sodium tripolyphosphate, 2 parts of antioxidant, 1 part of explosion-proof agent and 0.1 part of water reducer.
The water reducing agent is a sulfonate-based copolymer; the preparation method of the sulfonate-based copolymer comprises the following steps: adding 2-acrylamide-2-methylpropanesulfonic acid, 2-adamantyl acrylate, 2,3,4,5, 6-pentafluorostyrene and an initiator into a high-boiling point solvent, stirring and reacting for 3 hours at 60 ℃ in a nitrogen atmosphere, and removing the solvent by rotary evaporation to obtain a sulfonate-based copolymer; the mass ratio of the 2-acrylamide-2-methylpropanesulfonic acid to the 2-adamantyl acrylate to the 2,3,4,5, 6-pentafluorostyrene to the initiator to the high-boiling point solvent is 5:0.8:0.5:0.06:30; the initiator is azodiisobutyronitrile; the high boiling point solvent is dimethyl sulfoxide.
The explosion-proof agent is metal aluminum powder; the antioxidant metal silicon powder; the cement is PP52.5 type pozzolanic silicate cement.
The brown corundum is fused brown corundum, and in the fused brown corundum, al 2 O 3 More than or equal to 95 percent and C less than or equal to 0.08 percent, and is divided into three granularity grades of 8-5 mm, 5-3 mm and 3-1 mm, wherein the corresponding mass ratio of the three granularity grades is 35:25:28; the grain diameter of the nano zirconium silicide is 50nm; the diameter of the mullite fiber is 1 mu m, and the length-diameter ratio is 15:1; the refractory clay tailings are sillimanite; the particle size of the refractory clay tailings is 100 meshes.
The preparation method of the high-temperature-resistant iron runner castable comprises the following steps: weighing the raw materials according to the proportion, dry-mixing uniformly, adding water, and stirring for 4 minutes to obtain a mixed material; pouring the mixed materials into a mold, and vibrating, curing and baking to obtain a high-temperature-resistant iron runner castable; the addition amount of the water is 4.2wt% of the total mass of the raw materials.
Example 2
The example provides a high temperature resistant iron runner castable and a preparation method thereof, which are basically the same as example 1, except that the castable comprises the following raw materials in parts by weight: 45 parts of refractory clay tailings, 3.5 parts of mullite fiber, 12 parts of nano zirconium silicide, 23 parts of brown corundum, 2.5 parts of cement, 1.5 parts of water glass, 0.8 part of sodium tripolyphosphate, 2.5 parts of antioxidant, 1.2 parts of explosion-proof agent and 0.2 part of water reducer.
Example 3
The example provides a high temperature resistant iron runner castable and a preparation method thereof, which are basically the same as example 1, except that the castable comprises the following raw materials in parts by weight: 50 parts of refractory clay tailings, 4 parts of mullite fibers, 13 parts of nano zirconium silicide, 25 parts of brown alumina, 3 parts of cement, 2 parts of water glass, 1 part of sodium tripolyphosphate, 3 parts of antioxidant, 1.5 parts of explosion-proof agent and 0.35 part of water reducer.
Example 4
The example provides a high temperature resistant iron runner castable and a preparation method thereof, which are basically the same as example 1, except that the castable comprises the following raw materials in parts by weight: 55 parts of refractory clay tailings, 4.5 parts of mullite fiber, 14 parts of nano zirconium silicide, 28 parts of brown corundum, 3.5 parts of cement, 2.5 parts of water glass, 1.3 parts of sodium tripolyphosphate, 3.5 parts of antioxidant, 1.8 parts of explosion-proof agent and 0.4 part of water reducer.
Example 5
The example provides a high temperature resistant iron runner castable and a preparation method thereof, which are basically the same as example 1, except that the castable comprises the following raw materials in parts by weight: 60 parts of refractory clay tailings, 5 parts of mullite fibers, 15 parts of nano zirconium silicide, 30 parts of brown corundum, 4 parts of cement, 3 parts of water glass, 1.5 parts of sodium tripolyphosphate, 4 parts of antioxidant, 2 parts of explosion-proof agent and 0.5 part of water reducer.
Comparative example 1
This example provides a refractory runner castable and method of making the same as example 1 except that no nano zirconium silicide was added.
Comparative example 2
The present example provides a refractory iron runner castable and a method for preparing the same, which is substantially the same as example 1, except that the water reducing agent is a naphthalene sulfonate water reducing agent.
The high temperature resistant iron runner castable obtained in examples 1-5 and comparative examples 1-2 were subjected to performance test under the same conditions, and the bulk density of the samples was measured according to YB/T5200-1993; the normal temperature flexural strength and normal temperature compressive strength of the sample are measured according to GB/T5072-2008; the high-temperature flexural strength is kept at 1450 ℃ for 3 hours after the test sample is dried according to GB/T3002-2004; the test results are shown in Table 1 according to GB/T5988-2007 test sample line change rate.
Table 1 results of high temperature resistant iron runner castable performance test
From table 1, the high temperature resistant iron runner castable disclosed by the embodiment of the invention has better high temperature resistance and mechanical properties and better dimensional stability, which are the result of the synergistic effect of the raw materials.
The above embodiments are provided for illustrating the technical concept and features of the present invention, and are intended to enable those skilled in the art to understand the present invention and to implement the same, but are not intended to limit the scope of the present invention, and all equivalent changes or modifications according to the spirit of the present invention should be included in the scope of the present invention.
Claims (6)
1. The high-temperature-resistant iron runner castable is characterized by comprising the following raw materials in parts by weight: 40-60 parts of refractory clay tailings, 3-5 parts of mullite fiber, 10-15 parts of nano zirconium silicide, 20-30 parts of brown corundum, 2-4 parts of cement, 1-3 parts of water glass, 0.5-1.5 parts of sodium tripolyphosphate, 2-4 parts of antioxidant, 1-2 parts of explosion-proof agent and 0.1-0.5 part of water reducer;
the water reducer is a sulfonate-based copolymer, and the preparation method of the sulfonate-based copolymer comprises the following steps: adding 2-acrylamido-2-methylpropanesulfonic acid, 2-adamantyl acrylate, 2,3,4,5, 6-pentafluorostyrene and an initiator into a high-boiling point solvent, stirring and reacting for 3-5 hours at 60-70 ℃ in a nitrogen atmosphere, and then spin-evaporating to remove the solvent to obtain a sulfonate-based copolymer, wherein the mass ratio of the 2-acrylamido-2-methylpropanesulfonic acid to the 2-adamantyl acrylate to the 2,3,4,5, 6-pentafluorostyrene to the initiator to the high-boiling point solvent is (5-7): (0.8-1.2): (0.06-0.09): (30-40);
the cement is PP52.5 type pozzolanic silicate cement; the brown corundum is fused brown corundum, and in the fused brown corundum, al 2 O 3 More than or equal to 95 percent and C less than or equal to 0.08 percent, and is divided into three granularity grades of 8-5 mm, 5-3 mm and 3-1 mm, and the corresponding mass ratio of the three granularity grades is (35-47): (25-30) and (28-35).
2. The refractory iron runner castable as set forth in claim 1, wherein the initiator is at least one of azobisisobutyronitrile and azobisisoheptonitrile; the high boiling point solvent is at least one of dimethyl sulfoxide and N, N-dimethylformamide.
3. The refractory iron runner castable according to claim 1, wherein the explosion-proof agent is at least one of metal aluminum powder and aluminum lactate; the antioxidant is at least one of metal silicon powder, boron carbide and zirconium boride.
4. The refractory iron runner casting of claim 1, wherein the nano zirconium silicide has a particle size of 50-80nm; the diameter of the mullite fiber is 1-3 mu m, and the length-diameter ratio is (15-20): 1.
5. The refractory iron runner castable as set forth in claim 1, wherein the refractory clay tailings are at least one of sillimanite, soft clay tailings, and alunite; the particle size of the refractory clay tailings is 100-300 meshes.
6. A method for preparing the refractory iron runner castable according to any one of claims 1 to 5, comprising the steps of: weighing the raw materials according to the proportion, dry-mixing uniformly, adding water, and stirring for 4-6 minutes to obtain a mixed material; pouring the mixed materials into a mold, and vibrating, curing and baking to obtain a high-temperature-resistant iron runner castable; the addition amount of the water is 4.2-6.5wt% of the total mass of the raw materials.
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