CN110526689B - High-strength blast furnace taphole channel prefabricated part and preparation method thereof - Google Patents

Abstract

The invention discloses a high-strength blast furnace taphole channel prefabricated part and a preparation method thereof, wherein the preparation raw materials of the blast furnace taphole channel prefabricated part comprise aggregates, refractory materials, auxiliary materials and adhesives, the aggregates comprise alumina, fused dense corundum and brown corundum, the refractory materials comprise silicon carbide, titanium carbide and ceramic micropowder, the adhesives are calcium aluminate cement, and the auxiliary materials comprise spinel powder, alumina, silica powder, asphalt and an explosion-proof agent; the first composite material is formed by mixing the electric melting compact corundum, the brown corundum and the refractory material, the second composite material is formed by mixing the alumina, the refractory material and the adhesive, and the first composite material, the second composite material and the auxiliary material are mixed again to obtain the blast furnace taphole channel prefabricated part.

Description

High-strength blast furnace taphole channel prefabricated part and preparation method thereof

Technical Field

The invention relates to the technical field of metallurgy, in particular to a high-strength blast furnace taphole channel prefabricated part and a preparation method thereof.

Background

The smelting of the iron ore generally adopts a blast furnace process, the blast furnace iron making has the characteristics of low cost and high yield, and the service life of the blast furnace is an important factor for determining the smelting cost of the blast furnace. The key of the long service life of the blast furnace is the hearth, and the blast furnace iron notch is used as an important component of the blast furnace and is one of the weakest parts of the hearth, and the blast furnace iron notch mainly plays a role in ensuring that blast furnace slag iron can be discharged in time. Therefore, the iron mouth is required to be easy to open and block, and the iron flow does not splash in the tapping process, thereby reducing the iron loss. Blast furnace tapholes are subject to high temperatures, mechanical erosion and chemical attack by molten iron and slag. A large amount of molten iron and slag flow out every day, and the taphole is easy to be damaged by impact and erosion, so that the taphole is required to be firm and durable.

The traditional blast furnace taphole uses clay bricks or sillimanite bricks, and the clay bricks or the sillimanite bricks are seriously corroded and the corrosion loss part is replaced by stemming and slag in the process of dismantling the blast furnace at the end of the campaign. In addition, the phenomenon of coal gas leakage between the taphole frame and the combined bricks and inside the taphole channel can occur in different degrees in the taphole area of the blast furnace, which directly causes the scattered splashing of iron flow and the overflow of smoke dust in the tapping process of the blast furnace, seriously affects the operations of making a mud sleeve and plugging the taphole in front of the furnace, and affects the safe production of the blast furnace. Once the coal gas leakage in the taphole area is formed, the coal gas channel will show a deterioration trend due to the scouring action of the coal gas flow, so that the coal gas leakage in the taphole area must be treated, the stable and smooth operation of the blast furnace is ensured, and the safe production of the blast furnace is ensured.

In order to prolong the service life of the tap hole and prevent gas leakage, a blast furnace tap hole with longer service life and good fire resistance is developed according to the operation characteristics and the corrosion characteristics of the blast furnace tap hole.

Disclosure of Invention

In order to overcome the defects of the prior art, the invention provides a high-strength blast furnace taphole channel prefabricated part and a preparation method thereof, in the preparation process of the blast furnace taphole channel prefabricated part, bauxite is used as an aggregate to prepare a first composite material, fused compact corundum and brown corundum are used as aggregates to prepare a second composite material, and the particle sizes of the first composite material and the second composite material are controlled so as to achieve the good mixing effect of the two composite materials and the high strength, scouring resistance and air tightness of the prepared blast furnace taphole channel prefabricated part, and then auxiliary materials with good fire resistance are matched to improve the fire resistance of the blast furnace taphole channel prefabricated part.

The invention provides a high-strength blast furnace taphole channel prefabricated part, which is prepared from the following raw materials of aggregate, refractory material, auxiliary material and adhesive, wherein the aggregate comprises bauxite, fused compact corundum and brown corundum, the refractory material comprises silicon carbide, titanium carbide and ceramic micropowder, the adhesive is calcium aluminate cement, and the auxiliary material comprises spinel powder, alumina, silica powder, asphalt and an explosion-proof agent. The first composite material is formed by mixing the electric melting compact corundum, the brown corundum and the refractory material, the second composite material is formed by mixing the alumina, the refractory material and the adhesive, and the first composite material, the second composite material and the auxiliary material are mixed again to obtain the blast furnace taphole channel prefabricated part.

The aggregate comprises alumina, fused compact corundum and brown corundum. Preferably, the alumina is special grade alumina, and Al thereof ₂ O ₃ The content of the special-grade alumina is more than 90 percent, the grain composition of the special-grade alumina is 2-3 grades, and when the grain composition is 3 grades, the grain composition of the special-grade alumina is as follows: 5-10mm, 0-5mm and less than 0.088 mm; when the grain composition is grade 2, the grain composition of the special-grade alumina is as follows: 0-10mm and < 0.088 mm. The invention discovers that the blast furnace taphole channel prefabricated part prepared by using the special-grade bauxite has compact texture, few air holes and better fire resistance, can resist the long-time scouring of molten iron, and the more the grain composition of the special-grade bauxite is, the more compact the blank of the prepared blast furnace taphole channel prefabricated part is and the better the comprehensive performance is.

The particle size of each component in the aggregate is as follows: 3-5mm of fused dense corundum and 3-8mm of brown corundum.

The refractory material comprises silicon carbide, titanium carbide and ceramic micro powder, and the particle size of each component in the refractory material is as follows: 1-3mm of ceramic micro powder, less than or equal to 0.05mm of silicon carbide and less than or equal to 0.04mm of titanium carbide. The purity of the silicon carbide is not less than 98wt%, and the purity of the titanium carbide is not less than 98 wt%. The refractory material is combined with the aggregate, so that the refractory performance of the blast furnace taphole channel prefabricated member can be improved, and the problem of inevitable pores in the aggregate can be solved. In addition, the silicon carbide is easy to oxidize, and the titanium carbide with smaller grain size is used in the invention, titanium oxide is generated after the titanium carbide is oxidized, and the titanium oxide interacts with slag at the iron notch of the blast furnace to form a compact high-melting-point protective layer, so that the oxidation resistance of the blast furnace iron notch channel prefabricated part is improved.

The binder is calcium aluminate cement, the calcium aluminate cement plays the roles of the binder and the coagulant, the problems that different aggregates and refractory materials are directly mixed and separated from each other and the mixing property is not ideal are solved, and the calcium aluminate cement is solidified after hydration, so that the strength of the blast furnace taphole channel prefabricated member can be improved in an auxiliary manner. In addition, the present inventors have unexpectedly discovered that calcium aluminate cement interacts with spinel powder and alumina in the adjuvant during the mixing and forming processes to form a high strength material in the blank of the blast furnace taphole channel preform.

The auxiliary materials comprise spinel powder, aluminum oxide, silicon powder, asphalt and an explosion-proof agent, wherein the explosion-proof agent is aluminum powder. The spinel powder is a refractory material with excellent performance, has high melting point, good chemical stability, acid and alkali corrosion resistance, strong capacity of resisting oxidation iron slag and good thermal shock resistance, and in addition, because the fused dense corundum and brown corundum are subjected to solid solution in the spinel powder, the addition of the spinel powder can improve the mixing uniformity of the first composite material in the whole preparation raw material, so that the compactness and the high-temperature strength of the blast furnace taphole channel prefabricated member are improved.

Preferably, the alumina is activated alumina. The silicon powder is oxidized at the working temperature to generate SiO gas, the oxidation rate is prior to that of carbon, and the SiO gas enables CO to be reduced into carbon, so that the oxidation of the carbon is inhibited, and the protection effect is achieved; on the other hand, SiO gas can be further oxidized to generate SiO liquid phase, air holes are blocked, the density is improved, and a protective layer is formed to prevent oxygen from further invading.

The explosion-proof function of the aluminum powder is as follows: the small-granularity aluminum powder reacts quickly to form heat dissipation and exhaust micro-channels in the early stage of pressing of the blast furnace taphole channel prefabricated part, so that hydrogen explosion caused by adding metal aluminum powder is effectively prevented; the large-particle aluminum powder further increases the number of exhaust ducts in the later pressing stage, and the remaining water vapor is rapidly discharged, so that the bursting phenomenon is effectively prevented. The asphalt is high-temperature asphalt with the granularity less than 1mm, in the process of preparing the blank, volatile components in the high-temperature asphalt are gasified, and under the action of gas pressure, carbon elements in the asphalt enter the fine pores of the first composite material and the second composite material to form carbon coatings on the inner walls of the fine pores, so that molten slag is prevented from permeating into the fine pores.

The particle size of each component in the auxiliary material is as follows: the spinel powder is less than or equal to 0.038mm, the alumina is 1-10 mu m, the silicon powder is less than or equal to 0.035mm, and the aluminum powder comprises two types of particles with the particle size of less than 0.05mm and 0.05-0.1 mm.

The blast furnace taphole channel prefabricated part is prepared from the following raw materials in parts by weight: 12-16 parts of fused compact corundum (3-5mm), 10-13 parts of brown corundum (3-8mm), 20-25 parts of alumina (less than 0.088mm), 25-30 parts of alumina (0-5mm), 10-15 parts of alumina (5-10mm) and 1-5 parts of adhesive.

The refractory material added into the first composite material comprises the following components in parts by weight: 3-4 parts of silicon carbide (less than or equal to 0.05mm), 2-3 parts of titanium carbide (less than or equal to 0.04mm) and 1-3 parts of ceramic micro powder (1-3 mm).

The refractory material added into the second composite material comprises the following components in parts by weight: 8-10 parts of silicon carbide (less than or equal to 0.05mm), 3-5 parts of titanium carbide (less than or equal to 0.04mm) and 4-7 parts of ceramic micro powder (1-3 mm).

In the auxiliary materials, the spinel powder (less than or equal to 0.038mm) accounts for 5-8 parts, the alumina (1-10 mu m) accounts for 3-5 parts, the silicon powder (less than or equal to 0.035mm) accounts for 4-6 parts, the explosion-proof agent accounts for 2-4 parts, and the asphalt accounts for 1-2 parts.

The mass fraction of the spinel powder in the raw materials for preparing the blast furnace taphole channel prefabricated part is 4-6%, and preferably, the mass fraction is 4-5%.

The invention also provides a preparation method of the blast furnace taphole channel prefabricated part, which comprises the following steps:

(1) uniformly mixing the fused compact corundum and the brown corundum, sequentially adding titanium carbide, silicon carbide and ceramic micro powder, uniformly mixing, adding water, and continuously uniformly stirring to obtain a first composite material;

(2) uniformly mixing the bauxite with different particle grades, sequentially adding titanium carbide, silicon carbide and ceramic micro powder, uniformly mixing, adding calcium aluminate cement, uniformly mixing, adding water, and continuously uniformly stirring to obtain a second composite material;

(3) sequentially adding the alumina, the silicon powder, the spinel powder and the explosion-proof agent into the first composite material and the second composite material, finally adding the asphalt, uniformly mixing the slurry, and completely discharging bubbles to obtain a blank;

(4) after vacuum refining, the blank is pressed and formed to obtain a blast furnace taphole channel prefabricated part profile;

(5) after vacuumizing, the section is immersed in purified water for curing for 4-5 days; then preheating the section to the temperature of 120-.

The order of steps (1) and (2) can be switched.

According to the preparation method, when the first composite material and the second composite material are prepared, different types of refractory materials are sequentially added according to the order of the particles from small to large in the process of adding the refractory materials into the aggregate, so that the uniformity of the first composite material or the second composite material is improved, and the uniformity and the compactness of the final blast furnace taphole channel prefabricated member are improved. The invention discovers that the first composite material and the second composite material are respectively prepared, which is beneficial to the combination of different aggregates and refractory materials, and the invention discovers that the blast furnace taphole channel prefabricated part obtained by the method of mixing the first composite material and the second composite material and then mixing the first composite material and the second composite material with the auxiliary material has stronger impact resistance, firmness and compactness, and good heat insulation performance and erosion resistance. Probably, the adhesive is acted on the second composite material firstly and then acted with other components in the first composite material and auxiliary materials in different stages of mixing, refining, press forming and vacuum curing with the first composite material to generate a compound, so that the chemical components and the spatial structure of the blast furnace taphole channel prefabricated member are mutually cooperated to achieve the better performance.

In addition, the invention abandons the traditional vibration forming method, adopts a press forming method and is matched with purified water maintenance, thereby being beneficial to improving the compactness and the strength of the blast furnace taphole channel prefabricated part and reducing the pores.

Detailed Description

Unless defined otherwise, all scientific and technical terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The following examples are intended to illustrate the invention but are not intended to limit it.

Example 1

In this example, 12 parts of fused dense corundum (5mm), 13 parts of brown corundum (8mm), 25 parts of alumina (< 0.088mm), 25 parts of alumina (0-5mm), 10 parts of alumina (5-10mm) and 5 parts of calcium aluminate cement are used. The refractory material added into the first composite material comprises the following components in parts by weight: 3 parts of silicon carbide (less than or equal to 0.05mm), 3 parts of titanium carbide (less than or equal to 0.04mm) and 1 part of ceramic micro powder (3 mm); the refractory material added into the second composite material comprises the following components in parts by weight: 8 parts of silicon carbide (less than or equal to 0.05mm), 5 parts of titanium carbide (less than or equal to 0.04mm) and 4 parts of ceramic micro powder (3 mm). In the auxiliary materials, 8 parts of spinel powder (less than or equal to 0.038mm), 3 parts of alumina (1-10 mu m), 4 parts of silicon powder (less than or equal to 0.035mm), 2 parts of aluminum powder and 1 part of high-temperature asphalt.

(1) Uniformly mixing the fused compact corundum and the brown corundum, sequentially adding titanium carbide, silicon carbide and ceramic micro powder, uniformly mixing, adding water, and continuously uniformly stirring to obtain a first composite material;

(2) uniformly mixing the bauxite with different particle grades, sequentially adding titanium carbide, silicon carbide and ceramic micro powder, uniformly mixing, adding calcium aluminate cement, uniformly mixing, adding water, and continuously uniformly stirring to obtain a second composite material;

(3) sequentially adding alumina, silicon powder, spinel powder and aluminum powder into the first composite material and the second composite material, finally adding high-temperature asphalt, uniformly mixing the slurry, and completely discharging bubbles to obtain a blank;

(4) after vacuum refining, pressing and forming the blank by adopting a 600-ton press to obtain a blast furnace taphole channel prefabricated part profile;

(5) after vacuumizing, soaking the section in purified water for curing for 4-5 days; then preheating the section to the temperature of 120-.

Comparative example 1

In the comparative example, 12 parts of fused dense corundum (5mm) and 13 parts of brown corundum (8mm) are used. The refractory material added into the first composite material comprises the following components in parts by weight: 3 parts of silicon carbide (less than or equal to 0.05mm), 3 parts of titanium carbide (less than or equal to 0.04mm) and 1 part of ceramic micro powder (3 mm). In the auxiliary materials, 8 parts of spinel powder (less than or equal to 0.038mm), 3 parts of alumina (1-10 mu m), 4 parts of silica powder (less than or equal to 0.035mm), 2 parts of aluminum powder and 1 part of high-temperature asphalt.

(1) Uniformly mixing the fused compact corundum and the brown corundum, sequentially adding titanium carbide, silicon carbide and ceramic micro powder, uniformly mixing, adding water, and continuously uniformly stirring to obtain a first composite material;

(2) sequentially adding alumina, silicon powder, spinel powder and aluminum powder into the first composite material, finally adding high-temperature asphalt, uniformly mixing the slurry, and completely discharging bubbles to obtain a blank;

(3) after vacuum refining, pressing and forming the blank by adopting a 600-ton press to obtain a blast furnace taphole channel prefabricated part profile;

(4) after vacuumizing, soaking the section in purified water for curing for 4-5 days; then preheating the section to the temperature of 120-.

Comparative example 2

In this comparative example, 25 parts of alumina (< 0.088mm), 25 parts of alumina (0-5mm), 10 parts of alumina (5-10mm) and 5 parts of calcium aluminate cement were used. The refractory material added into the second composite material comprises the following components in parts by weight: 8 parts of silicon carbide (less than or equal to 0.05mm), 5 parts of titanium carbide (less than or equal to 0.04mm) and 4 parts of ceramic micro powder (3 mm). In the auxiliary materials, 8 parts of spinel powder (less than or equal to 0.038mm), 3 parts of alumina (1-10 mu m), 4 parts of silicon powder (less than or equal to 0.035mm), 2 parts of aluminum powder and 1 part of high-temperature asphalt.

(1) Uniformly mixing the bauxite with different particle grades, sequentially adding titanium carbide, silicon carbide and ceramic micro powder, uniformly mixing, adding calcium aluminate cement, uniformly mixing, adding water, and continuously uniformly stirring to obtain a second composite material;

(2) sequentially adding alumina, silicon powder, spinel powder and aluminum powder into the second composite material, finally adding high-temperature asphalt, uniformly mixing the slurry, and completely discharging bubbles to obtain a blank;

(3) after vacuum refining, pressing and forming the blank by adopting a 600-ton press to obtain a blast furnace taphole channel prefabricated part profile;

(4) after vacuumizing, soaking the section in purified water for curing for 4-5 days; then preheating the section to the temperature of 120-.

Comparative example 3

In the comparative example, 12 parts of fused compact corundum (5mm), 13 parts of brown corundum (8mm), 25 parts of alumina (less than 0.088mm), 25 parts of alumina (0-5mm), 10 parts of alumina (5-10mm) and 5 parts of calcium aluminate cement are used. The refractory material comprises the following components in parts by weight: 11 parts of silicon carbide (less than or equal to 0.05mm), 8 parts of titanium carbide (less than or equal to 0.04mm) and 5 parts of ceramic micro powder (3 mm). In the auxiliary materials, 8 parts of spinel powder (less than or equal to 0.038mm), 3 parts of alumina (1-10 mu m), 4 parts of silica powder (less than or equal to 0.035mm), 2 parts of aluminum powder and 1 part of high-temperature asphalt.

(1) Uniformly mixing fused compact corundum, brown corundum and bauxite with different particle grades, sequentially adding titanium carbide, silicon carbide and ceramic micro powder, uniformly mixing, adding calcium aluminate cement, uniformly mixing, adding water, and continuously uniformly stirring;

(2) sequentially adding alumina, silicon powder, spinel powder and aluminum powder into the material obtained in the step (1), finally adding high-temperature asphalt, uniformly mixing the slurry, and obtaining a blank after bubbles are completely discharged;

(3) after vacuum refining, pressing and forming the blank by adopting a 600-ton press to obtain a blast furnace taphole channel prefabricated part profile;

(4) after vacuumizing, soaking the section in purified water for curing for 4-5 days; then preheating the section to the temperature of 120-.

The performance indexes of example 1 and comparative examples 1 to 3 are shown in Table 1.

TABLE 1 comparison of the Properties of example 1 and comparative examples 1 to 3

As can be seen from Table 1, the performance parameters of the bulk density, the compressive strength, the flexural strength and the rate of change of the heating permanent line of the comparative examples 1 to 3 are all significantly lower than those of the example 1, which shows that the first composite material, the second composite material and the preparation method thereof of the present invention play an important role in improving the comprehensive performance of the blast furnace taphole channel preform.

Example 2

The spinel powder (. ltoreq.0.038 mm) used in this example was 3 parts, and the other raw materials and the amounts and preparation methods thereof were the same as in example 1.

Example 3

The spinel powder (. ltoreq.0.038 mm) used in this example was 5 parts, and the other raw materials and the amounts and preparation methods thereof were the same as in example 1.

Example 4

The spinel powder (less than or equal to 0.038mm) used in this example was 7 parts, and the other raw materials, the amounts thereof and the preparation method were the same as in example 1.

TABLE 2 Effect of spinel powder usage on blast furnace taphole channel preforms

As can be seen from table 2, in examples 2 to 4, the mass fractions of spinel powders were 2%, 4% and 5%, respectively, and the corresponding data of bulk density and compressive strength were improved as the mass fraction of spinel powder was increased, and the mass fraction of spinel powder of example 1 was 6%, and the corresponding data of bulk density and compressive strength were smaller than those of example 4. The data in table 2 show that when the mass fraction of spinel powder is about 5%, the blast furnace taphole channel prefabricated part has high volume density and compressive strength, good compactness and difficult generation of air leakage caused by gaps.

Example 5

In this example, 16 parts of fused dense corundum (3mm), 10 parts of brown corundum (3mm), 20 parts of alumina (< 0.088mm), 30 parts of alumina (0-5mm), 15 parts of alumina (5-10mm) and 1 part of calcium aluminate cement are used. The refractory material added into the first composite material comprises the following components in parts by weight: 4 parts of silicon carbide (less than or equal to 0.05mm), 2 parts of titanium carbide (less than or equal to 0.04mm) and 3 parts of ceramic micro powder (3 mm); the refractory material added into the second composite material comprises the following components in parts by weight: 10 parts of silicon carbide (less than or equal to 0.05mm), 3 parts of titanium carbide (less than or equal to 0.04mm) and 7 parts of ceramic micro powder (3 mm). In the auxiliary materials, 7 parts of spinel powder (less than or equal to 0.038mm), 5 parts of alumina (1-10 mu m), 6 parts of silicon powder (less than or equal to 0.035mm), 4 parts of aluminum powder and 2 parts of high-temperature asphalt.

The blast furnace taphole channel preform of this example was prepared in the same manner as in example 1.

Example 6

In this example, 14 parts of fused dense corundum (4mm), 12 parts of brown corundum (6mm), 23 parts of alumina (< 0.088mm), 28 parts of alumina (0-5mm), 13 parts of alumina (5-10mm) and 3 parts of calcium aluminate cement are used. The refractory material added into the first composite material comprises the following components in parts by weight: 4 parts of silicon carbide (less than or equal to 0.05mm), 3 parts of titanium carbide (less than or equal to 0.04mm) and 2 parts of ceramic micro powder (3 mm); the refractory material added into the second composite material comprises the following components in parts by weight: 9 parts of silicon carbide (less than or equal to 0.05mm), 4 parts of titanium carbide (less than or equal to 0.04mm) and 5 parts of ceramic micro powder (3 mm). In the auxiliary materials, 7 parts of spinel powder (less than or equal to 0.038mm), 4 parts of alumina (1-10 mu m), 5 parts of silicon powder (less than or equal to 0.035mm), 3 parts of aluminum powder and 1.5 parts of high-temperature asphalt.

The blast furnace taphole channel preform of this example was prepared in the same manner as in example 1.

TABLE 3 comparison of the Properties of examples 4-6

As can be seen from Table 3, the formulations of examples 4-6 are all within the range of the raw materials and the amounts thereof required by the present invention, and the comprehensive properties of examples 4-6 reach the specification value or the level above the specification value, which shows that the formulations and the preparation method of the present invention have good stability, and the prepared blast furnace taphole channel preform has good properties.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and the like that are within the spirit and principle of the present invention are included in the present invention.

Claims (6)

1. The high-strength blast furnace taphole channel prefabricated part is characterized in that the blast furnace taphole channel prefabricated part is prepared from raw materials including aggregate, refractory materials, auxiliary materials and an adhesive, wherein the aggregate comprises alumina, fused dense corundum and brown corundum, the refractory materials comprise silicon carbide, titanium carbide and ceramic micropowder, the adhesive is calcium aluminate cement, and the auxiliary materials comprise spinel powder, alumina, silica powder, asphalt and an explosion-proof agent; mixing the fused compact corundum, the brown corundum and the refractory material I to form a first composite material, mixing the alumina, the refractory material II and the adhesive to form a second composite material, and mixing the first composite material, the second composite material and the auxiliary material again to obtain the blast furnace taphole channel prefabricated part;

the blast furnace taphole channel prefabricated part is prepared from the following raw materials in parts by weight: 12-16 parts of fused compact corundum, 10-13 parts of brown corundum, 20-25 parts of alumina with the particle size of less than 0.088mm, 25-30 parts of alumina with the particle size of 0-5mm, 10-15 parts of alumina with the particle size of 5-10mm and 1-5 parts of adhesive;

the refractory material I added into the first composite material comprises the following components in parts by weight: 3-4 parts of silicon carbide, 2-3 parts of titanium carbide and 1-3 parts of ceramic micro powder; the refractory material II added with the second composite material comprises the following components in parts by weight: 8-10 parts of silicon carbide, 3-5 parts of titanium carbide and 4-7 parts of ceramic micro powder;

in the auxiliary materials, the spinel powder accounts for 5-8 parts, the aluminum oxide accounts for 3-5 parts, the silicon powder accounts for 4-6 parts, the explosion-proof agent accounts for 2-4 parts, and the asphalt accounts for 1-2 parts;

the preparation method for the high-strength blast furnace taphole channel prefabricated part comprises the following steps:

(1) uniformly mixing the fused compact corundum and the brown corundum, sequentially adding titanium carbide, silicon carbide and ceramic micro powder, uniformly mixing, adding water, and continuously uniformly stirring to obtain a first composite material;

(2) uniformly mixing the bauxite with different particle grades, sequentially adding titanium carbide, silicon carbide and ceramic micro powder, uniformly mixing, adding calcium aluminate cement, uniformly mixing, adding water, and continuously uniformly stirring to obtain a second composite material;

(3) sequentially adding the alumina, the silicon powder, the spinel powder and the explosion-proof agent into the first composite material and the second composite material, finally adding the asphalt, uniformly mixing the slurry, and completely discharging bubbles to obtain a blank;

(4) after vacuum refining, the blank is subjected to compression molding to obtain a blast furnace taphole channel prefabricated part profile;

(5) after vacuumizing, the section is immersed in purified water for curing for 4-5 days; preheating the section to the temperature of 120-;

the order of steps (1) and (2) can be switched.

2. The blast furnace taphole channel preform according to claim 1, wherein the fused dense corundum has particles of 3-5mm, and the brown corundum has particles of 3-8 mm.

3. The blast furnace taphole channel preform according to claim 1, wherein the particle size of the components in the refractory material is: 1-3mm of ceramic micro powder, less than or equal to 0.05mm of silicon carbide and less than or equal to 0.04mm of titanium carbide, wherein the purity of the silicon carbide is not less than 98wt%, and the purity of the titanium carbide is not less than 98 wt%.

4. The blast furnace taphole channel preform according to claim 1, wherein the anti-explosion agent is aluminum powder, the alumina is activated alumina, and the pitch is high temperature pitch.

5. The blast furnace taphole channel preform according to claim 1, wherein the particle size of each component in the auxiliary material is: the spinel powder is less than or equal to 0.038mm, the alumina is 1-10 mu m, the silicon powder is less than or equal to 0.035mm, the aluminum powder comprises two types of particles with the particle size of less than 0.05mm and 0.05-0.1mm, and the particle size of the asphalt is less than 1 mm.

6. The method for manufacturing a blast furnace taphole channel preform according to any of the claims 1 to 5, characterized in that the method for manufacturing comprises the steps of:

(1) uniformly mixing the fused compact corundum and the brown corundum, sequentially adding titanium carbide, silicon carbide and ceramic micro powder, uniformly mixing, adding water, and continuously uniformly stirring to obtain a first composite material;

(2) uniformly mixing the bauxite with different particle grades, sequentially adding titanium carbide, silicon carbide and ceramic micro powder, uniformly mixing, adding calcium aluminate cement, uniformly mixing, adding water, and continuously uniformly stirring to obtain a second composite material;

(3) sequentially adding the alumina, the silicon powder, the spinel powder and the explosion-proof agent into the first composite material and the second composite material, finally adding the asphalt, uniformly mixing the slurry, and completely discharging bubbles to obtain a blank;

(4) after vacuum refining, the blank is subjected to compression molding to obtain a blast furnace taphole channel prefabricated part profile;

(5) after vacuumizing, the section is immersed in purified water for curing for 4-5 days; preheating the section to the temperature of 120-;

the order of steps (1) and (2) can be exchanged.