CN111606695A - Corrosion-resistant Al2O3-SiC-C iron runner material and preparation method thereof - Google Patents
Corrosion-resistant Al2O3-SiC-C iron runner material and preparation method thereof Download PDFInfo
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Abstract
The invention discloses corrosion-resistant Al2O3an-SiC-C iron runner material and a preparation method thereof, belonging to the technical field of iron runner material production. The iron runner material comprises the following components in parts by weight: the additive comprises 55-65 parts of alumina aggregate, 22-32 parts of silicon carbide, 2-8 parts of alumina micro powder, 2-10 parts of kyanite tailings and 2-4 parts of a binding agent; the additive consists of 0.6-1.2 parts of silicon micropowder, 0.5-2.5 parts of spherical asphalt, 0.5-1.5 parts of metal silicon powder and 0.06-0.16 part of water reducing agent, and the iron runner material is prepared by pouring the raw materials into a stirrer and uniformly mixing the raw materials. The invention has simple process and low cost, and the prepared Al2O3the-SiC-C iron runner material has the advantages of good corrosion resistance, high strength and the like.
Description
Technical Field
The invention belongs to the technical field of iron runner material production, and particularly relates to corrosion-resistant Al2O3-SiC-C iron runner material and a preparation method thereof.
Background
In the twenty-first century, with the rapid development of automobile and ship manufacturing industries, the demand for steel is increasing. The blast furnace gradually becomes larger, and the iron yield is remarkably increased. The blast furnace tapping channel is a channel for guiding high-temperature molten iron and molten slag, so that the refractory material lining of the blast furnace tapping channel is eroded by the molten iron and the molten slag for a long time, and further, the blast furnace tapping channel is damaged and cracked. The main reason for this phenomenon is that the low degree of densification of the material results in a large number of pores in the matrix, which accelerates the erosion and diffusion of molten iron and slag in the material.
The industrial waste-kyanite tailings are aluminosilicate minerals and are decomposed after calcination to generate a large amount of mullite and quartz phases. Because the mullite has high refractoriness and good erosion resistance and thermal shock stability, the mullite can be used as a reinforcing material of a matrix to obviously improve the high-temperature strength and the erosion resistance of the product. In addition, the quartz phase generated by decomposition under the high-temperature condition is a molten liquid phase, so that the pores in the matrix can be effectively filled, and the corrosion resistance of the product is improved. Therefore, by using the kyanite tailings as the industrial raw material, the problems of environmental pollution, resource waste and the like can be effectively solved, and the obvious economic benefit and practical value are achieved.
Whisker reinforced Al2O3A preparation method (CN110240486A) of an-SiC-C iron runner castable discloses a method for preparing whisker reinforced Al by taking corundum aggregate, silicon carbide, carbon black, metal aluminum powder/ceramic membrane microcapsules, α -alumina powder, silica micropowder and calcium aluminate cement as raw materials and adding a catalyst and a water reducing agent2O3-SiC-C iron runner castable. The method realizes Al to a certain extent2O3The erosion resistance and the thermal shock stability of the-SiC-C castable are improved. But its main drawbacks are: (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. Kyanite pair Al2O3Effect of-SiC-C iron runner castable Properties (refractory, 2013, 47 (1): by adding Al to2O3Kyanite is added into the-SiC-C iron runner castable, and a high-temperature high-breaking strength and a normal-temperature strength after high-temperature burning of the material are improved by utilizing a kyanite pyrolysis mechanism. But the cost of the kyanite material is far higher than that of the kyanite tailing material, so that the production cost is increased in the production process. And the chemical composition of the tailings is different from that of the tailings, so that the reaction process is inThe chemical compositions of the produced low-melting-phase substances are different, so that the filling efficiency of the pores with the low-melting-phase viscosity is influenced.
Disclosure of Invention
Aiming at the problems in the prior art, the invention aims to provide an anti-corrosion Al2O3the-SiC-C iron runner material not only obviously improves Al by adding the kyanite tailings2O3The corrosion resistance and the strength of the-SiC-C iron runner material, and effectively solves the problems of environmental pollution, resource waste and the like. The invention also provides an Al with corrosion resistance2O3The preparation method of the-SiC-C iron runner material adopts a dry mixing method to prepare the iron runner material, and has the advantages of simple method, simple operation and high efficiency.
In order to solve the problems, the technical scheme adopted by the invention is as follows:
corrosion-resistant Al2O3The preparation method of the-SiC-C iron runner material comprises the following steps of: the additive comprises 55-65 parts of alumina aggregate, 22-32 parts of silicon carbide, 2-8 parts of alumina micropowder, 2-10 parts of kyanite tailings and 2-4 parts of a binding agent, wherein the additive consists of 0.6-1.2 parts of silicon micropowder, 0.5-2.5 parts of spherical asphalt, 0.5-1.5 parts of metal silicon powder and 0.06-0.16 part of a water reducing agent; pouring the raw materials into a stirrer, and dry-mixing the raw materials uniformly.
The corrosion-resistant Al2O3The preparation method of the-SiC-C iron runner material comprises the following steps of: the additive comprises 55-59 parts of alumina aggregate, 28-32 parts of silicon carbide, 2-4 parts of alumina micro powder, 2-5 parts of kyanite tailings and 4-3 parts of a binding agent; the additive comprises 0.6-1.2 parts of silica powder, 0.5-2.5 parts of spherical asphalt, 0.5-1.5 parts of metal silicon powder and 0.06-0.16 part of water reducing agent.
The corrosion-resistant Al2O3The preparation method of the-SiC-C iron runner material comprises the following steps of: the additive comprises 59-62 parts of alumina aggregate, 25-28 parts of silicon carbide, 4-6 parts of alumina micro powder, 5-8 parts of kyanite tailings and 2.5-3 parts of a binding agent; the additive is composed of 0.6-12 parts of silicon micropowder, 0.5-2.5 parts of spherical asphalt, 0.5-1.5 parts of metal silicon powder and 0.06-0.16 parts of water reducing agent;
the corrosion-resistant Al2O3The preparation method of the-SiC-C iron runner material comprises the following steps of: the additive comprises 62-65 parts of alumina aggregate, 22-25 parts of silicon carbide, 6-8 parts of alumina micro powder, 8-10 parts of kyanite tailings and 2-2.5 parts of a binding agent; the additive comprises 0.6-1.2 parts of silica powder, 0.5-2.5 parts of spherical asphalt, 0.5-1.5 parts of metal silicon powder and 0.06-0.16 part of water reducing agent.
The corrosion-resistant Al2O3Preparation method of-SiC-C iron runner material, and Al in alumina aggregate2O3≥ 88 wt.%; the bauxite aggregate composition is as follows: 30-35% of alumina aggregate with the particle size of 5-8 mm, 27-33% of alumina aggregate with the particle size of 3-5 mm and 35-40% of alumina aggregate with the particle size of 1-3 mm.
The corrosion-resistant Al2O3A preparation method of-SiC-C iron runner material, wherein SiC in the silicon carbide is more than or equal to 96.5 wt.%; the silicon carbide particle composition is as follows: the silicon carbide with the grain diameter of 0-1 mm accounts for 42-57 percent of the total grain diameter of silicon carbide, the silicon carbide with the grain diameter of 0.075mm accounts for 22-35 percent of the total grain diameter of silicon carbide, and the silicon carbide with the grain diameter of 0.044mm accounts for 20-24 percent of the total grain diameter of silicon carbide.
The corrosion-resistant Al2O3The preparation method of the-SiC-C iron runner material comprises the step of preparing the alumina micro powder with the grain size of less than or equal to 0.006 mm.
The corrosion-resistant Al2O3The preparation method of the-SiC-C iron runner material, wherein the kyanite is SiO in tailings230-40 wt.% of Al2O350-60 wt.% ZrO22-3 wt.% of Fe2O30.5-1 wt.%, 0.5-1.0 wt.% CaO + MgO, and 3-5 wt.% loss on ignition; the grain diameter of the kyanite is less than or equal to 0.088 mm.
The corrosion-resistant Al2O3The preparation method of the-SiC-C iron runner material comprises the steps that the particle size of the silicon micro powder is less than or equal to 0.045mm, the particle size of the spherical asphalt is less than or equal to 0.1mm, and the particle size of the metal silicon powder is less than or equal to 0.05 mm.
The above-mentioned corrosion-resistant Al2O3-SiC-C ironThe iron runner material is prepared by the preparation method of the runner material.
Has the advantages that: compared with the prior art, the invention has the advantages that:
(1) the method adopts the kyanite tailings as the reinforcing agent and adds Al2O3In the-SiC-C iron runner material, the problems of environmental pollution, resource waste and the like can be effectively solved, and the economic benefit is obvious. In addition, mullite and fused quartz generated by decomposition at high temperature are effectively filled in relative to the internal pores of the iron channel material, so that Al is promoted2O3The corrosion resistance and the strength of the-SiC-C iron runner material are improved obviously.
(2) Corrosion resistant Al of the invention2O3The normal temperature breaking strength of the sample after the heat treatment of-SiC-C iron runner material product at 1450 ℃ for × 3 hours is 19-25 MPa, and the volume density is 2.99-3.09 g/cm3The porosity is 10% to 13%.
(3) The iron runner material is prepared by pouring the raw materials into a stirrer and uniformly mixing the raw materials in a dry mode, and is simple in process and low in cost.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with examples are described in detail below.
The bauxite aggregate used in the invention comprises the following main chemical components: al (Al)2O3More than or equal to 88 wt.%, the alumina aggregate gradation is: 30-35% of alumina aggregate with the particle size of 5-8 mm, 27-33% of alumina aggregate with the particle size of 3-5 mm and 35-40% of alumina aggregate with the particle size of 1-3 mm.
The main chemical components of the silicon carbide are as follows: SiC is more than or equal to 96.5 wt.%. The silicon carbide particle grading is as follows: the silicon carbide with the grain diameter of 0-1 mm accounts for 42-57 percent of the total grain diameter of silicon carbide, the silicon carbide with the grain diameter of 0.075mm accounts for 22-35 percent of the total grain diameter of silicon carbide, and the silicon carbide with the grain diameter of 0.044mm accounts for 20-24 percent of the total grain diameter of silicon carbide.
The grain diameter of the alumina micro powder is less than or equal to 0.006 mm.
The kyanite is the main chemical components of tailings: SiO 2230-40 wt.% of Al2O350-60 wt.% ZrO22-3 wt.% of Fe2O30.5-1 wt.%, 0.5-1.0 wt.% CaO + MgO, and 3-5 wt.% loss on ignition; the grain diameter of the kyanite is less than or equal to 0.088 mm.
The grain size of the silicon micro powder is less than or equal to 0.045mm, the grain size of the spherical asphalt is less than or equal to 0.1mm, and the grain size of the metal silicon powder is less than or equal to 0.05 mm.
Example 1
Corrosion-resistant Al2O3the-SiC-C iron runner material comprises the following components in parts by weight: the additive comprises 55-59 parts of alumina aggregate, 28-32 parts of silicon carbide, 2-4 parts of alumina micro powder, 2-5 parts of kyanite tailings and 4-3 parts of a binding agent; the additive consists of 0.6-1.2 parts of silica micropowder, 0.5-2.5 parts of spherical asphalt, 0.5-1.5 parts of metal silicon powder and 0.06-0.16 part of water reducing agent; the preparation method comprises pouring the raw materials into a stirrer, and mixing uniformly to obtain the corrosion-resistant Al2O3-SiC-C iron runner.
Corrosion resistant Al prepared in example 12O3The normal temperature breaking strength of the sample after the heat treatment of-SiC-C iron runner material product at 1450 ℃ for × 3 hours is 19-21 MPa, and the volume density is 2.99-3.03 g/cm3The porosity is 12% to 13%.
Example 2
Corrosion-resistant Al2O3the-SiC-C iron runner material comprises the following components in parts by weight: the additive comprises 59-62 parts of alumina aggregate, 25-28 parts of silicon carbide, 4-6 parts of alumina micro powder, 5-8 parts of kyanite tailings and 2.5-3 parts of a binding agent; the additive consists of 0.6-1.2 parts of silica micropowder, 0.5-2.5 parts of spherical asphalt, 0.5-1.5 parts of metal silicon powder and 0.06-0.16 part of water reducing agent; the preparation method comprises the steps of pouring the raw materials into a stirrer to be uniformly dry-mixed and dry-mixed to obtain the corrosion-resistant Al2O3-SiC-C iron runner.
Corrosion resistant Al prepared in example 22O3The normal temperature breaking strength of the pattern of the-SiC-C iron runner material product after heat treatment at 1450 ℃ for × 3 hours is 21-23 MPa, and the volume density is 3.03-3.06 g/cm3The porosity is 11 to 12%.
Example 3
Corrosion-resistant Al2O3-SiC-C iron runnerThe material consists of the following components in parts by weight: the additive comprises 62-65 parts of alumina aggregate, 22-25 parts of silicon carbide, 6-8 parts of alumina micro powder, 8-10 parts of kyanite tailings and 2-2.5 parts of a binding agent; the additive consists of 0.6-1.2 parts of silica micropowder, 0.5-2.5 parts of spherical asphalt, 0.5-1.5 parts of metal silicon powder and 0.06-0.16 part of water reducing agent; the preparation method comprises the steps of pouring the raw materials into a stirrer to be uniformly dry-mixed and dry-mixed to obtain the corrosion-resistant Al2O3-SiC-C iron runner.
Corrosion resistant Al prepared in example 32O3The normal temperature breaking strength of the sample after the heat treatment of-SiC-C iron runner material product at 1450 ℃ for × 3 hours is 23-25 MPa, and the volume density is 3.06-3.09 g/cm3The porosity is 10% to 11%.
From the experimental results, the method adopts the kyanite tailings as the reinforcing agent to add Al2O3In the-SiC-C iron runner material, the problems of environmental pollution, resource waste and the like can be effectively solved, and the obvious economic benefit is achieved. In addition, mullite and fused quartz generated by decomposition at high temperature are effectively filled in relative to the internal pores of the iron channel material, so that Al is promoted2O3The corrosion resistance and the strength of the-SiC-C iron runner material are improved obviously. Corrosion resistant Al of the invention2O3The normal temperature breaking strength of the sample after the heat treatment of-SiC-C iron runner material product at 1450 ℃ for × 3 hours is 19-25 MPa, and the volume density is 2.99-3.09 g/cm3The porosity is 10% to 13%. Therefore, Al is obviously improved by adding the kyanite tailings2O3The corrosion resistance and the strength of the-SiC-C iron runner material, and effectively solves the problems of environmental pollution, resource waste and the like.
The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention in any way, and any person skilled in the art can make any simple modification, equivalent replacement, and improvement on the above embodiment without departing from the technical spirit of the present invention, and still fall within the protection scope of the technical solution of the present invention.
Claims (10)
1. Corrosion-resistant Al2O3The preparation method of the-SiC-C iron runner material is characterized in that the iron runner material comprises the following components in parts by weight: the additive comprises 55-65 parts of alumina aggregate, 22-32 parts of silicon carbide, 2-8 parts of alumina micropowder, 2-10 parts of kyanite tailings and 2-4 parts of a binding agent, wherein the additive consists of 0.6-1.2 parts of silicon micropowder, 0.5-2.5 parts of spherical asphalt, 0.5-1.5 parts of metal silicon powder and 0.06-0.16 part of a water reducing agent; pouring the raw materials into a stirrer, and dry-mixing the raw materials uniformly.
2. The erosion resistant Al of claim 12O3The preparation method of the-SiC-C iron runner material is characterized in that the iron runner material comprises the following components in parts by weight: the additive comprises 55-59 parts of alumina aggregate, 28-32 parts of silicon carbide, 2-4 parts of alumina micro powder, 2-5 parts of kyanite tailings and 4-3 parts of a binding agent; the additive comprises 0.6-1.2 parts of silica powder, 0.5-2.5 parts of spherical asphalt, 0.5-1.5 parts of metal silicon powder and 0.06-0.16 part of water reducing agent.
3. The erosion resistant Al of claim 12O3The preparation method of the-SiC-C iron runner material is characterized in that the iron runner material comprises the following components in parts by weight: the additive comprises 59-62 parts of alumina aggregate, 25-28 parts of silicon carbide, 4-6 parts of alumina micro powder, 5-8 parts of kyanite tailings and 2.5-3 parts of a binding agent; the additive comprises 0.6-1.2 parts of silica powder, 0.5-2.5 parts of spherical asphalt, 0.5-1.5 parts of metal silicon powder and 0.06-0.16 part of water reducing agent.
4. The erosion resistant Al of claim 12O3The preparation method of the-SiC-C iron runner material is characterized in that the iron runner material comprises the following components in parts by weight: the additive comprises 62-65 parts of alumina aggregate, 22-25 parts of silicon carbide, 6-8 parts of alumina micro powder, 8-10 parts of kyanite tailings and 2-2.5 parts of a binding agent; the additive comprises 0.6-1.2 parts of silica powder, 0.5-2.5 parts of spherical asphalt, 0.5-1.5 parts of metal silicon powder and 0.06-0.16 part of water reducing agent.
5. The corrosion-resistant Al according to any one of claims 1 to 42O3The preparation method of the-SiC-C iron runner material is characterized in that Al in the alumina aggregate2O3≥ 88 wt.%; the bauxite aggregate composition is as follows: 30-35% of alumina aggregate with the particle size of 5-8 mm, 27-33% of alumina aggregate with the particle size of 3-5 mm and 35-40% of alumina aggregate with the particle size of 1-3 mm.
6. The corrosion-resistant Al according to any one of claims 1 to 42O3The preparation method of the-SiC-C iron runner material is characterized in that SiC in the silicon carbide is more than or equal to 96.5 wt.%; the silicon carbide particle composition is as follows: the silicon carbide with the grain diameter of 0-1 mm accounts for 42-57 percent of the total grain diameter of silicon carbide, the silicon carbide with the grain diameter of 0.075mm accounts for 22-35 percent of the total grain diameter of silicon carbide, and the silicon carbide with the grain diameter of 0.044mm accounts for 20-24 percent of the total grain diameter of silicon carbide.
7. The corrosion-resistant Al according to any one of claims 1 to 42O3The preparation method of the-SiC-C iron runner material is characterized in that the grain size of the alumina micro powder is less than or equal to 0.006 mm.
8. The corrosion-resistant Al according to any one of claims 1 to 42O3The preparation method of the-SiC-C iron runner material is characterized in that the kyanite is SiO in tail mineralization230-40 wt.% of Al2O350-60 wt.% ZrO22-3 wt.% of Fe2O30.5-1 wt.%, 0.5-1.0 wt.% CaO + MgO, and 3-5 wt.% loss on ignition; the grain diameter of the kyanite is less than or equal to 0.088 mm.
9. The corrosion-resistant Al according to any one of claims 1 to 42O3The preparation method of the-SiC-C iron runner material is characterized in that the grain size of the silicon micro powder is less than or equal to 0.045mm, the grain size of the spherical asphalt is less than or equal to 0.1mm, and the grain size of the metal silicon powder is less than or equal to 0.05 mm.
10. The corrosion-resistant Al according to claim 1 to 42O3The iron runner material prepared by the preparation method of the-SiC-C iron runner material.
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