阅读说明：本技术 一种环保型低碳铝碳滑板不烧砖及其制备方法 (Environment-friendly low-carbon aluminum-carbon non-fired brick for sliding plate and preparation method thereof ) 是由 刘新红 靳亲国 张婧 贾全利 于 2021-10-15 设计创作，主要内容包括：本发明公开了一种环保型低碳铝碳滑板不烧砖及其制备方法,属于炼钢连铸用耐火材料技术领域。所述环保型低碳铝碳滑板不烧砖包括以下重量百分比的原料,65～70%刚玉骨料、5～15%刚玉细粉、10～15%铝硅合金粉、5～8%活性氧化铝微粉、2～4%碳、1～4%含硼添加剂,及占上述原料总和5～6%的无机结合剂。制备过程为将上述原料混合好的料,在150MPa下压制成型、在110～200℃干燥,进行钻孔,再进行100～120℃干燥排除钻孔水分,然后进行磨制、打箍、粘壳、涂面工序制成环保型低碳铝碳不烧滑板砖。本发明是以环保型无机结合剂代替酚醛树脂,且采用不烧不浸油的方法制备铝碳质滑板,所制备的铝碳质滑板是一种节能、环保、生产成本较低和具有良好中温强度的环保型不烧低碳铝碳滑板材料。(The invention discloses an environment-friendly low-carbon aluminum-carbon non-fired brick for a sliding plate and a preparation method thereof, belonging to the technical field of refractory materials for steelmaking and continuous casting. The environment-friendly low-carbon aluminum-carbon unburned brick for the slide plate comprises the following raw materials, by weight, 65-70% of corundum aggregate, 5-15% of corundum fine powder, 10-15% of aluminum-silicon alloy powder, 5-8% of activated alumina micro powder, 2-4% of carbon, 1-4% of boron-containing additive and 5-6% of inorganic binder accounting for the total weight of the raw materials. The preparation process comprises the steps of pressing and molding the mixed raw materials under 150MPa, drying at 110-200 ℃, drilling, drying at 100-120 ℃ to remove water in the drilled hole, and then grinding, hooping, adhering a shell and coating the surface to prepare the environment-friendly low-carbon aluminum-carbon unfired sliding brick. The invention uses environment-friendly inorganic bonding agent to replace phenolic resin, and adopts a method of no-burning and no-oil immersion to prepare the aluminum-carbon sliding plate, and the prepared aluminum-carbon sliding plate is an environment-friendly no-burning low-carbon aluminum-carbon sliding plate material which has the advantages of energy saving, environment protection, lower production cost and good medium-temperature strength.)

1. The environment-friendly low-carbon aluminum-carbon unburned brick for the sliding plate is characterized by comprising the following raw materials, by weight, 65-70% of corundum aggregate, 5-15% of corundum fine powder, 10-15% of aluminum-silicon alloy powder, 5-8% of activated alumina micro powder, 2-4% of carbon, 1-4% of a boron-containing additive and 5-6% of an inorganic binder accounting for the total weight of the raw materials.

2. The environment-friendly low-carbon aluminum-carbon sliding plate unburned brick according to claim 1, wherein the corundum aggregate is one or more of white corundum particles, compact corundum particles and tabular corundum particles, and the critical particle size is 3 mm.

3. The environment-friendly low-carbon aluminum-carbon unburned brick for the skateboard of claim 1, wherein the corundum fine powder is one or more of white corundum fine powder, compact corundum fine powder and tabular corundum fine powder, and the particle size of the corundum fine powder is less than 88 microns.

4. The environment-friendly low-carbon aluminum-carbon sliding plate unburned brick according to claim 2 or 3, wherein the alumina content in the white corundum particles or fine powder, the dense corundum or fine powder and the tabular corundum or fine powder is 98wt% -99.5 wt%, 98.5wt% -99.5 wt% and 98.5wt% -99.5 wt%, respectively, and the critical particle size is 3 mm.

5. The environment-friendly low-carbon aluminum-carbon skateboard unburned brick according to claim 1, wherein the carbon is one or both of graphite and carbon black.

6. The environment-friendly low-carbon aluminum-carbon skateboard unburned brick according to claim 1, wherein the boron-containing additive is one or more of boron carbide, boron nitride and zirconium boride, and the particle size is less than 0.044 mm.

7. The environment-friendly low-carbon aluminum-carbon skateboard unburned brick according to claim 1, wherein the inorganic binder is one or more of clay, pure calcium aluminate cement, and phosphate.

8. The environment-friendly low-carbon aluminum-carbon skateboard unburned brick according to claim 7, wherein the phosphate is aluminum dihydrogen phosphate.

9. The preparation method of the environment-friendly low-carbon aluminum-carbon sliding plate unburned brick comprises the following steps:

(1) firstly, premixing various fine powders, namely uniformly stirring and stirring corundum fine powder, aluminum-silicon alloy powder, activated alumina micro powder, carbon, boron-containing additive and inorganic binder in a double-cone stirrer to prepare premixed powder;

(2) premixing corundum aggregate, and stirring and mixing 3-0mm white corundum particles, 3-0mm compact corundum particles and 3-0mm tabular corundum particles to obtain the premixed corundum aggregate;

(3) adding the premixed powder in the step (1) into the premixed corundum aggregate in the step (2), then adding water accounting for 6% of the total raw materials, and uniformly mixing;

(4) and (3) pressing and molding the mixed materials under 150MPa, drying at 110-200 ℃, drilling, drying at 100-120 ℃ to remove water in the drilled holes, and then grinding, hooping, adhering a shell and coating to prepare the environment-friendly low-carbon aluminum-carbon unburned sliding brick.

Technical Field

The invention belongs to the technical field of refractory materials for steelmaking and continuous casting, and relates to a preparation method of an environment-friendly low-carbon aluminum-carbon sliding plate unburned brick for controlling the flow of molten steel.

Background

With the continuous popularization and application of new steelmaking and continuous casting technologies and the development of certain varieties of steel (high-oxygen steel, calcium-treated steel, clean steel and the like), the sliding plate is subjected to strong thermal shock, erosive wear of high-temperature molten steel, erosion of environmental media and larger temperature fluctuation in the using process, and the working environment of the sliding plate is worse. At present, the aluminum carbon and aluminum zirconium carbon sliding plates which are commonly used in continuous casting have cracks, galling and oxidation in different degrees, which influence the further improvement of the service life, thereby being incapable of better adapting to the requirements of new continuous casting technology. And the aluminum carbon and aluminum zirconium carbon sliding plates adopt a high-temperature sintering process, so that the energy consumption is high and the environmental pollution is serious.

In recent years, a series of novel sliding plates are prepared by adopting an unfired process, and the novel sliding plates have certain energy-saving and environment-friendly effects. The binding agent of the unburned sliding plate is phenolic resin, organic volatile matters are generated through decomposition during application, the organic volatile matters pollute air and are harmful to human health, and greenhouse gas CO generated by carbon oxidation of the resin₂Causing the climate to warm.

In addition, phenolic resin is decomposed and oxidized in a medium-temperature area (300-700 ℃) to cause the medium-temperature strength of the sliding plate to be obviously reduced, and a strength valley is generated at about 600 ℃, so that the sliding surface of the sliding plate is easy to be roughened, broken, cast holes are not resistant to scouring and the like when the sliding plate is used, blocks of the sliding plate in a non-sliding area (about 600 ℃) are easy to fall off, potential safety hazards are caused to steelmaking continuous casting, and the wide application of the non-burning sliding plate is limited.

Therefore, the preparation of the environment-friendly low-carbon aluminum-carbon sliding plate without brick burning is urgent.

Disclosure of Invention

The invention aims to provide a preparation method of an environment-friendly low-carbon aluminum-carbon sliding plate unburned brick. The aluminum-carbon sliding plate prepared by the preparation method is an environment-friendly unfired low-carbon aluminum-carbon sliding plate material which is energy-saving, environment-friendly, low in production cost and good in medium-temperature strength.

In order to achieve the purpose, the invention adopts the technical scheme that:

the environment-friendly low-carbon aluminum-carbon unburned brick for the sliding plate comprises the following raw materials, by weight, 65-70% of corundum aggregate, 5-15% of corundum fine powder, 10-15% of aluminum-silicon alloy powder, 5-8% of activated alumina micro powder, 2-4% of carbon, 1-4% of a boron-containing additive and an inorganic binder which accounts for 5-6% of the total weight of the raw materials.

Furthermore, the corundum aggregate is one or more of white corundum particles, compact corundum particles and tabular corundum particles, and the critical particle size is 3 mm.

Further, the corundum fine powder is one or more of white corundum fine powder, compact corundum fine powder and tabular corundum fine powder, and the particle size is less than 88 microns.

Furthermore, the alumina content in the white corundum particles or fine powder, the alumina content in the compact corundum or fine powder and the alumina content in the tabular corundum or fine powder are respectively 98-99.5 wt%, 98.5-99.5 wt% and 98.5-99.5 wt%, and the critical grain size is 3 mm.

Further, the carbon is one or two of graphite and carbon black.

Further, the boron-containing additive is one or more of boron carbide, boron nitride and zirconium boride, and the granularity is less than 0.044 mm.

Further, the inorganic binder is one or more of clay, pure calcium aluminate cement and phosphate.

Further, the phosphate is aluminum dihydrogen phosphate.

The preparation method of the environment-friendly low-carbon aluminum-carbon sliding plate unburned brick comprises the following steps:

(1) firstly, premixing various fine powders, namely uniformly stirring and stirring corundum fine powder, aluminum-silicon alloy powder, activated alumina micro powder, carbon, boron-containing additive and inorganic binder in a double-cone stirrer to prepare premixed powder;

(2) premixing corundum aggregate, and stirring and mixing 3-0mm white corundum particles, 3-0mm compact corundum particles and 3-0mm tabular corundum particles to obtain the premixed corundum aggregate;

(3) adding the premixed powder in the step (1) into the premixed corundum aggregate in the step (2), then adding water accounting for 6% of the total raw materials, and uniformly mixing;

(4) and (3) pressing and molding the mixed materials under 150MPa, drying at 110-200 ℃, drilling, drying at 100-120 ℃ to remove water in the drilled holes, and then grinding, hooping, adhering a shell and coating to prepare the environment-friendly low-carbon aluminum-carbon unburned sliding brick.

According to the technical scheme, the forming density of the unfired sliding plate is improved by utilizing the plasticity of the clay, and the clay generates mullite at high temperature, so that the high-temperature performance of the unfired sliding plate is improved; the low-temperature strength of the unfired sliding plate can be improved by using the pure calcium aluminate cement and the phosphate.

Compared with the prior art, the invention has the beneficial effects that:

1. the invention adopts environment-friendly inorganic bonding agent, so that the unfired sliding plate does not produce pollutants in the preparation and application processes, and is beneficial to environmental protection.

2. The invention adopts inorganic bonding agent, the strength is not reduced at about 600 ℃, and the problem of block falling in the non-burning sliding-proof area of the sliding plate is solved.

3. The invention has the characteristic of low carbon content, the total carbon content of the prior sliding plates such as aluminum carbon, aluminum zirconium carbon and the like is 10-14%, and the sliding plates are environment-friendly, low-carbon and unfired Al₂O₃The carbon content of the-C sliding plate is reduced to be below 4 percent, which is beneficial to clean steel smelting.

4. The invention adopts the non-burning process, can effectively save energy, reduce labor intensity and shorten production period.

Detailed Description

The technical solutions and effects of the present invention will be further described with reference to specific examples, but the scope of the present invention is not limited thereto.

Example 1

The environment-friendly low-carbon aluminum-carbon non-fired brick for the skateboard comprises, by weight, corundum fine powder (10% of white corundum fine powder and 5% of tabular corundum fine powder), corundum aggregate (20% of white corundum particles, 25% of compact corundum particles and 20% of tabular corundum particles), aluminum-silicon alloy powder 10%, and activated alumina7% of micro powder, 1% of graphite, 1% of carbon black and B₄C1%, and additional inorganic binder 5% (3% clay, 2% cement).

The preparation method of the environment-friendly low-carbon aluminum-carbon sliding plate unburned brick comprises the following steps:

1) firstly, corundum fine powder, aluminum-silicon alloy powder, active alumina micro powder, graphite, carbon black and B₄C. Stirring clay and cement in a double-cone stirrer uniformly to prepare premixed powder;

2) respectively taking 3-0mm white corundum particles, 3-0mm compact corundum particles and 3-0mm tabular corundum particles, stirring and mixing, adding the premixed powder in 1) into the corundum particles after uniformly mixing, then adding water accounting for 6% of the total weight of the raw materials, and uniformly mixing;

3) and (3) pressing and molding the mixed materials under 150MPa, drying at 110 ℃ for 24h, drilling, drying at 100-120 ℃ for 8h to remove water in the drilled hole, and then grinding, hooping, adhering a shell and coating the surface to prepare the environment-friendly low-carbon aluminum-carbon unburned sliding brick.

The apparent porosity of the product obtained in this example was 5.8%, the room-temperature compressive strength was 120MPa, the medium-temperature strength at 600 ℃ was 9.5MPa, and the high-temperature flexural strength was 40 MPa.

Example 2

The environment-friendly low-carbon aluminum-carbon slide plate unburned brick comprises, by weight, corundum fine powder (5% of white corundum fine powder), corundum aggregate (20% of white corundum particles, 25% of compact corundum particles, 25% of tabular corundum particles), 15% of aluminum-silicon alloy powder, 5% of activated alumina micro powder, 4% of graphite, 1% of BN, and 6% of an additional inorganic binder (3% of clay, 2% of pure calcium aluminate cement, 1% of aluminum dihydrogen phosphate).

The preparation method of the environment-friendly low-carbon aluminum-carbon sliding plate unburned brick comprises the following steps:

1) firstly, corundum fine powder, aluminium-silicon alloy powder, graphite and B₄C. Uniformly stirring BN, clay, cement and aluminum dihydrogen phosphate in a double-cone stirrer to prepare premixed powder;

2) respectively taking 3-0mm white corundum particles, 3-0mm compact corundum particles and 3-0mm tabular corundum particles, stirring and mixing, adding the premixed powder in 1) into the corundum particles after uniformly mixing, then adding water accounting for 6.5% of the total weight of the raw materials, and uniformly mixing;

3) and (3) pressing and molding the mixed materials under 150MPa, drying at 150 ℃ for 24h, drilling, drying at 100-120 ℃ for 8h to remove water in the drilled hole, and then grinding, hooping, adhering a shell and coating the surface to prepare the environment-friendly low-carbon aluminum-carbon unburned sliding brick.

The apparent porosity of the product obtained in this example was 5.4%, the room-temperature compressive strength was 130MPa, the medium-temperature strength at 600 ℃ was 12.0MPa, and the high-temperature flexural strength was 45 MPa.

Example 3

The environment-friendly low-carbon aluminum-carbon non-fired brick for the slide plate comprises, by weight, corundum fine powder (dense corundum fine powder 3% and tabular corundum fine powder 5%), corundum aggregate (white corundum particles 15%, dense corundum particles 25% and tabular corundum particles 27%), aluminum-silicon alloy powder 11%, activated alumina micro powder 8%, graphite 2%, and B₄1 percent of C, 1 percent of BN, 2 percent of zirconium boride and 6 percent of inorganic bonding agent (3 percent of clay, 2 percent of pure calcium aluminate cement and 1 percent of aluminum dihydrogen phosphate).

The preparation method of the environment-friendly low-carbon aluminum-carbon sliding plate unburned brick comprises the following steps:

1) firstly, corundum fine powder, aluminum-silicon alloy powder, active alumina micro powder, graphite and B₄C. Uniformly stirring BN, clay, cement and aluminum dihydrogen phosphate in a double-cone stirrer to prepare premixed powder;

2) respectively taking 3-0mm white corundum particles, 3-0mm compact corundum particles and 3-0mm tabular corundum particles, stirring and mixing, adding the premixed powder in 1) into the corundum particles after uniformly mixing, then adding water accounting for 6.5% of the total weight of the raw materials, and uniformly mixing;

3) and (3) pressing and molding the mixed materials under 150MPa, drying at 200 ℃ for 24h, drilling, drying at 100-120 ℃ for 8h to remove water in the drilled hole, and then grinding, hooping, adhering a shell and coating the surface to prepare the environment-friendly low-carbon aluminum-carbon unburned sliding brick.

The apparent porosity of the product obtained in this example was 5.0%, the room-temperature compressive strength was 135MPa, the medium-temperature strength at 600 ℃ was 12.0MPa, and the high-temperature flexural strength was 48 MPa.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.