Iron runner castable containing modified anti-explosion fiber and preparation method thereof

Abstract

The application discloses an iron runner castable containing modified explosion-proof fibers and a preparation method thereof. The castable contains the following components in percentage by mass: 4-10wt% of dense corundum fine powder, 3-8wt% of active alpha-Al2O3 micro powder, 1.5-4.5wt% of silicon micro powder, 12-25wt% of silicon carbide, 1.5-3wt% of calcium aluminate cement, 1.5-4wt% of carbon source, 2-3.5wt% of submicron composite anti-oxidant, 0.15-0.4wt% of modified explosion-proof fibers, 0.1-0.2wt% of aluminum powder, 0.05-0.2wt% of polycarboxylate dispersant, and the balance of brown corundum particles. The application obtains modified explosion-proof fibers by modifying thermoplastic organic fibers, and the explosion-proof performance of the castable prepared by using the modified explosion-proof fibers is significantly improved. The mechanical properties, slag erosion resistance and oxidation resistance of the castable are also improved. Meanwhile, the modified explosion-proof fibers do not fly everywhere and have good dispersibility during the dry mixing of the castable, and do not form through pores in the matrix after high-temperature cracking or ablation.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of amorphous refractory, and particularly relates to an iron runner castable containing modified anti-explosion fiber and a preparation method thereof. BACKGROUND

[0002] The iron runner is a necessary channel for tapping the blast furnace, and the physical erosion of hundreds of millions of tons of molten iron and the chemical erosion of blast furnace slag in China have put forward strict requirements on the service performance of the iron runner castable. At present, the cement combined with alumina-silicon carbide-carbon castable is the mainstream material system in service. In fact, in order to speed up the site turnover speed, the iron runner castable often has to face rapid roasting during construction, which is easy to cause explosion. The main mechanism of the above damage is that under the rapid roasting system, the permeability of the castable is difficult to meet the demand of rapid escape of water vapor, and a high water vapor pressure is formed on the side away from the high temperature roasting. Once it exceeds the splitting limit strength of the castable, explosion or crack will occur, which will damage the structural integrity and seriously affect the service life and construction safety of the castable.

[0003] Generally, to solve the problem of explosion of the castable, adding an anti-explosion agent is the most effective solution. Common anti-explosion agents include aluminum powder, anti-explosion fiber, organic anti-explosion agent, etc. The aluminum powder mainly generates hydrogen gas by hydration to escape and form an exhaust passage in the castable; the anti-explosion fiber forms an exhaust passage by plastic deformation and cracking during roasting; and the organic ammonium salt mainly forms an exhaust passage by generating ammonia gas and the like. In fact, considering the actual effect and cost performance, the organic fiber is the most commonly used anti-explosion agent, but its use also has certain limitations: during dry mixing of the castable, the organic fiber is light in mass and is easy to float around and difficult to disperse; after high-temperature cracking or ablation, it forms a through hole in the matrix, which has a certain negative impact on the mechanical properties, slag resistance and oxidation resistance of the castable.

[0004] Therefore, it is urgent to innovatively modify the organic fiber to solve the above problems and improve the green manufacturing of steel smelting and the long service life of refractory materials. SUMMARY

[0005] The technical problem to be solved by the present invention is to provide an iron ditch castable containing modified explosion-proof fibers and a preparation method thereof in response to the deficiencies in the above-mentioned prior art. The present invention obtains modified explosion-proof fibers by modifying thermoplastic organic fibers. The modified explosion-proof fibers are not easy to fly around and have good dispersion during the dry mixing process of the castable, and the explosion-proof performance of the prepared castable is significantly improved. At the same time, a hollow resin-silane structure is introduced, and a silicon carbide-carbon-silicon carbide reinforcement is generated by in-situ reaction at high temperature. This structure will avoid the risk of traditional organic fiber cracking leading to weakening of the mechanical properties of the castable and providing a through-pore channel for air / slag. Furthermore, the reinforcement will also improve the bonding strength of the matrix, significantly improving the castable's resistance to thermal shock, slag erosion and oxidation resistance.

[0006] The technical solution adopted by the present invention to solve the above-mentioned problems is:

[0007] A castable for an iron trough containing modified explosion-proof fibers, comprising the following components by mass percentage: 4-10 wt% of dense corundum fine powder, 3-8 wt% of active α-Al2O3 micropowder, 1.5-4.5 wt% of silicon micropowder, 12-25 wt% of silicon carbide, 1.5-3 wt% of calcium aluminate cement, 1.5-4 wt% of a carbon source, 2-3.5 wt% of a submicron composite antioxidant, and 0.15-

[0008] 0.4wt% of modified explosion-proof fiber, 0.1-0.2wt% of metal aluminum powder, 0.05-0.2wt% of polycarboxylate dispersant, and the balance is brown corundum particles.

[0009] In the above scheme, the preparation method of the modified explosion-proof fiber is: immersing thermoplastic organic fiber in a mixture of silane coupling agent, thermosetting phenolic resin and anhydrous ethanol, ultrasonically dispersing the fiber, and drying and cutting the fiber to obtain the modified explosion-proof fiber.

[0010] In the above scheme, the thermoplastic organic fiber is polyethylene fiber or polypropylene fiber with a length of 5-8 cm and a diameter of 15-40 μm; the mass ratio of silane coupling agent, thermosetting phenolic resin and anhydrous ethanol is 1:1:0.5-1; the ultrasonic dispersion time is 10-15 minutes; the drying temperature is 80-100°C; the surface coating thickness of the modified explosion-proof fiber after impregnation and drying is 5-15 μm, and the length of the modified explosion-proof fiber after cutting is 4-8 mm.

[0011] In the above scheme, the carbon source is one or a mixture of carbon black, flake graphite, artificial graphite and spherical pitch, wherein the carbon black is submicron carbon black, the particle size of the spherical pitch is ≤1mm, the particle size of the artificial graphite is ≤1mm, and the particle size of the flake graphite is 200 mesh.

[0012] In the scheme, the sub-micron composite antioxidant is a mixture of at least two of titanium carbide, elemental silicon, zirconium boride and boron nitride.

[0013] In the scheme, the content of Al2O3 in the dense corundum fine powder is >99wt%, and the particle size of the dense corundum fine powder is <45μm.

[0014] In the scheme, the content of Al2O3 in the active α-Al2O3 micro powder is >99.5wt%, and the particle size of the active α-Al2O3 micro powder is <5μm.

[0015] In the scheme, the content of SiO2 in the silicon micro powder is >95wt%, and the particle size of the silicon micro powder is <0.5μm.

[0016] In the scheme, the content of SiC in the silicon carbide is >98wt%, and the silicon carbide includes SiC fine powder and SiC particles, wherein the particle size of the SiC particles is 1-0.1mm, and the particle size of the SiC micro powder is <75μm.

[0017] In the scheme, the content of Al2O3 in the brown corundum particles is >95wt%, and the particle size of the brown corundum particles includes 1-0.1mm, 3-1mm, 5-3mm and 8-5mm.

[0018] In the scheme, the content of Al2O3 in the calcium aluminate cement is >70wt%, and the particle size of the calcium aluminate cement is <45μm.

[0019] In the scheme, the particle size of the aluminum metal powder is <75μm.

[0020] The application also claims the preparation method of the iron channel castable containing the modified explosion-proof fiber, which comprises the following steps:

[0021] (1) the dense corundum fine powder, the active α-Al2O3 micro powder, the silicon micro powder, the silicon carbide, the calcium aluminate cement, the carbon source, the sub-micron composite antioxidant, the modified explosion-proof fiber, the aluminum metal powder, the polycarboxylate dispersant and the brown corundum particles are weighed and uniformly mixed to obtain a premix;

[0022] (2) water accounting for 3-6wt% of the premix is added to the premix obtained in step (1) and uniformly mixed to obtain a wet mix, and the wet mix is poured and vibrated to form, and the iron channel castable containing the modified explosion-proof fiber is obtained after drying.

[0023] Compared with the prior art, the application has the following beneficial effects:

[0024] (1) The present application provides a modified explosion-proof fiber containing iron runner castable, the modified explosion-proof fiber is obtained by modifying the thermoplastic organic fiber, the modified explosion-proof fiber is not easy to fly around and has good dispersibility during the construction of the castable, and the prepared castable improves the explosion-proof performance, mechanical property, slag corrosion resistance and oxidation resistance.

[0025] (2) The surface of the modified explosion-proof fiber immersed in the silane coupling agent-resin-anhydrous ethanol mixed solution can form a 5-15 μm thick coating, which can significantly improve the dispersion problem of the fiber in the castable, and the self-weight of the fiber is appropriately increased, the utilization rate of the fiber is improved, and the problems of the fiber flying around during the stirring process of the castable and being inhaled into the human body to harm health are improved.

[0026] (3) In the present application, the modified explosion-proof fiber is designed to have a specific length (4-8 mm), and the main purpose is to realize performance regulation by adjusting the length-diameter ratio of the fiber; the mutual bridging and stacking of the longer fibers help to form a smooth exhaust passage around the large aggregate, and the shorter fibers mainly realize the establishment of the ventilation passage in the local matrix, and the two complement each other to form a three-dimensional ventilation network passage, but not a complete hollow structure. The surface of the modified explosion-proof fiber has a 5-15 μm thick coating, and although the organic fiber will completely crack at about 500℃ when the castable is heated, a hollow silane-resin structure will be left in the castable. With further temperature rise, the silane coupling agent and phenolic resin crack at high temperature to provide silicon source and carbon source respectively, and under the protection of local reducing atmosphere, silicon carbide or silicon carbon oxygen crystal nucleus is formed, which induces the gradual growth of whiskers to fill the entire residual hollow structure. The inner and outer surfaces of the structure at high temperature can form ceramic whiskers, which on the one hand strengthens the hollow structure, and on the other hand improves the interfacial bonding strength of the structure and the matrix, forming a silicon carbide-carbon-silicon carbide reinforcement, which will play the mechanism of crack deflection, bridging and pullout toughening, and can improve the thermal shock resistance and erosion resistance of the castable; in addition, the structure can also significantly avoid the oxygen and melt penetration problems caused by the traditional hollow channel, improve the slag corrosion resistance and oxidation resistance of the castable, and thus significantly improve the comprehensive performance and service life of the castable.

[0027] (4) The metal aluminum powder used in the present application is a relatively coarse 75 μm metal aluminum powder, which gradually hydrates in the aqueous solution to form hydrogen gas escaping, and the fine pores help to further enhance the explosion-proof performance of the castable and avoid adverse effects on the mechanical properties. BRIEF DESCRIPTION OF DRAWINGS

[0028] Figure 1 Figure 1 is a diagram of the silicon carbide whisker wrapped fiber residual structure in the castable prepared in Example 1 of the present application. DETAILED DESCRIPTION

[0029] The technical solutions of the present application will be described in detail below in combination with the embodiments, but the described embodiments are only part of the embodiments of the present application, and all other embodiments obtained by those skilled in the art without creative labor on the basis of the embodiments in the present application belong to the protection scope of the present application.

[0030] An iron runner castable containing modified explosion-proof fiber, the castable comprises the following components in percentage by mass: 4-10wt% of dense corundum fine powder, 3-8wt% of active alpha-Al2O3 micro powder, 1.5-4.5wt% of silicon micro powder, 12-25wt% of silicon carbide, 1.5-3wt% of calcium aluminate cement, 1.5-4wt% of carbon source, 2-3.5wt% of sub-micron composite antioxidant, 0.15-0.4wt% of modified explosion-proof fiber, 0.1-0.2wt% of aluminum powder, 0.05-0.2wt% of polycarboxylate dispersant, and the balance of brown corundum particles.

[0031] The preparation method of the modified explosion-proof fiber is as follows: the thermoplastic organic fiber is soaked in a mixed solution composed of silane coupling agent, thermosetting phenolic resin and anhydrous ethanol, ultrasonic dispersion is performed for 10-15 minutes, and the modified explosion-proof fiber is obtained after drying and cutting. The thermoplastic organic fiber is polypropylene fiber with a length of 5-8 cm and a diameter of 15-40 μm; the mass ratio of the silane coupling agent, the thermosetting phenolic resin and the anhydrous ethanol is 1:1:0.5-1, and the drying temperature is 80-100℃; the surface coating thickness of the modified explosion-proof fiber after soaking and drying is 5-15 μm, and the length of the cut modified explosion-proof fiber is 4-8 mm.

[0032] The content of Al2O3 in the dense corundum fine powder is >99wt%, and the particle size of the dense corundum fine powder is <45 μm.

[0033] The content of Al2O3 in the active alpha-Al2O3 micro powder is >99.5wt%, and the particle size of the active alpha-Al2O3 micro powder is <5 μm.

[0034] The content of SiO2 in the silicon micro powder is >95wt%, and the particle size of the silicon micro powder is <0.5 μm.

[0035] The content of SiC in the silicon carbide is >98wt%, and the silicon carbide includes SiC fine powder and SiC particles, wherein the particle size of the SiC particles is 1-0.1 mm, and the particle size of the SiC fine powder is <75 μm.

[0036] The content of Al2O3 in the calcium aluminate cement is >70wt%, and the particle size of the calcium aluminate cement is <45 μm.

[0037] The carbon source is a mixture of carbon black, flaky graphite and spherical pitch with a mass ratio of 1:0.5:1, wherein the carbon black is sub-micron carbon black, the particle size of the spherical pitch is ≤1 mm, and the particle size of the flaky graphite is 200 mesh.

[0038] The sub-micron composite antioxidant is a mixture of titanium carbide, elemental silicon and zirconium boride with a mass ratio of 1:1.5:0.5.

[0039] The particle size of the aluminum metal powder is <75 μm.

[0040] The content of Al2O3 in the brown corundum particles is >95 wt%, and the particle size of the brown corundum particles includes 1-0.1 mm, 3-1 mm, 5-3 mm and 8-5 mm.

[0041] The polycarboxylate dispersant is FS20.

[0042] Example 1

[0043] A preparation method of an iron runner castable containing modified blast-resistant fibers is provided, comprising the following steps:

[0044] 1) Preparation of modified blast-resistant fibers:

[0045] Mix the silane coupling agent, thermosetting phenolic resin and anhydrous ethanol according to a mass ratio of 1:1:0.5 to obtain a mixed solution, immerse the thermoplastic organic fibers with a length of 5 cm in the mixed solution, and ultrasonically disperse for 15 minutes. Dry the fibers at 80°C, and cut them into modified blast-resistant fibers with a specific length (4-8 mm).

[0046] 2) Weighing of raw materials:

[0047] Weigh 7.5 wt% of dense corundum powder, 5 wt% of active α-Al2O3 micro powder, 2.95 wt% of silicon micro powder, 17 wt% of silicon carbide, 2 wt% of calcium aluminate cement, 3 wt% of carbon source, 0.25 wt% of the modified blast-resistant fibers obtained in step 1), 2 wt% of sub-micron composite antioxidant, 0.15 wt% of aluminum metal powder, 0.15 wt% of polycarboxylate dispersant (FS20) and 60 wt% of brown corundum particles as raw materials.

[0048] 3) Mix the raw materials weighed in step 2) uniformly to obtain a premix;

[0049] 4) Add water accounting for 4 wt% of the premix to the premix obtained in step 3) and mix uniformly to obtain a wet mix, and cast and vibrate the wet mix to form an iron runner castable containing modified blast-resistant fibers.

[0050] The casted castable is sequentially cured, dried and heat treated, and performance tests are conducted; wherein:

[0051] 1) Curing process: curing for 24h under the condition of temperature 25℃ and humidity 75%.

[0052] 2) Drying process: drying for 24h under 110℃.

[0053] 3) Strength test after heat treatment at different temperatures for the castable obtained in Example 1:

[0054] ① In the heat treatment stage, the castable has a bending strength of 17.2MPa and a compressive strength of 116MPa under the condition of 1450℃ for 3h. After quenching at 900℃, the castable has a bending strength retention rate of 74% and a compressive strength retention rate of 94%.

[0055] ② In the heat treatment stage, the castable has a high-temperature bending strength of 5.5MPa under the condition of 1450℃ for 0.5h.

[0056] 4) Explosion-proof performance test for the castable obtained in Example 1: the sample did not burst within 30min of heat preservation in the furnace preheated to 600℃.

[0057] 5) Slag resistance test for the castable obtained in Example 1: using static crucible method, the sample has a slag line erosion depth of 1.7mm under the condition of 1550℃ for 3h.

[0058] 6) Oxidation resistance test for the castable obtained in Example 1: after heat treatment at 1450℃ for 3h, the sample has an oxidation area ratio of 12%.

[0059] Figure 1 Figure of the structure of the silicon carbide whisker wrapping fiber left in the iron runner castable containing modified explosion-proof fiber prepared in Example 1 of the present application.

[0060] Example 2

[0061] A preparation method of an iron runner castable containing modified explosion-proof fiber is provided, which comprises the following steps:

[0062] 1) Preparation of modified explosion-proof fiber:

[0063] Mix silane coupling agent, thermosetting phenolic resin and anhydrous ethanol according to the mass ratio of 1:1:0.7 to obtain a mixed solution, immerse thermoplastic organic fiber with a length of 5cm in the mixed solution, and ultrasonically disperse for 15 minutes. Dry it at 80℃, and cut it into modified explosion-proof fiber with a specific length (length of 4-8mm).

[0064] 2) Weigh the raw materials:

[0065] Take 7.5wt% of dense corundum fine powder, 5wt% of active α-Al2O3 micro powder, 2.95wt% of silicon micro powder, 17wt% of silicon carbide, 2wt% of calcium aluminate cement, 3wt% of carbon source, 0.25wt% of the modified anti-explosion fiber obtained in step 1), 2wt% of sub-micron composite anti-oxidant, 0.15wt% of aluminum powder, 0.15wt% of polycarboxylate dispersant (FS20) and 60wt% of brown corundum particles as raw materials.

[0066] 3) Mix the raw materials weighed in step 2) uniformly to obtain a premix;

[0067] 4) Add water accounting for 4wt% of the premix to the premix obtained in step 3) and mix uniformly to obtain a wet mix, and the wet mix is poured and vibrated to form an iron runner castable containing the modified anti-explosion fiber;

[0068] The castable after molding is sequentially cured, dried and heat treated, and performance tests are conducted; wherein:

[0069] 1) The curing process is: curing for 24h under the condition of temperature 25℃ and humidity 75%.

[0070] 2) The drying process is: drying for 24h at 110℃.

[0071] 3) Strength test of the castable obtained in Example 2 after heat treatment at different temperatures:

[0072] ① In the heat treatment stage, the castable has a bending strength of 16MPa and a compressive strength of 107MPa under the condition of 1450℃ for 3h; after the 900℃ quenching experiment, the castable has a bending strength retention rate of 66% and a compressive strength retention rate of 90%.

[0073] ② In the heat treatment stage, the castable has a high-temperature bending strength of 5.2MPa under the condition of 1450℃ for 0.5h.

[0074] 4) Anti-explosion performance test of the castable obtained in Example 2: the experimental furnace is preheated to 600℃, and the sample does not burst within 30min of heat preservation in the furnace.

[0075] 5) Slag resistance test of the castable obtained in Example 2: using static crucible method, under the condition of 1550℃ for 3h, the cross-section slag line erosion depth of the sample is 2.0mm.

[0076] 6) Anti-oxidation performance test of the castable obtained in Example 2: after heat treatment at 1450℃ for 3h, the oxidation area ratio of the sample is 14%.

[0077] Example 3

[0078] Provided is a preparation method of an iron runner castable containing modified blast-resistant fibers, comprising the following steps:

[0079] 1) Preparation of modified blast-resistant fibers:

[0080] A mixture liquid is obtained by mixing a silane coupling agent, a thermosetting phenolic resin and anhydrous ethanol in a mass ratio of 1:1:1, thermoplastic organic fibers with a length of 5 cm are soaked therein and ultrasonically dispersed for 15 minutes, and then dried at 80°C, cut into modified blast-resistant fibers with a specific length (4-8 mm in length).

[0081] 2) Weighing of raw materials:

[0082] 7.5wt% of dense corundum powder, 5wt% of active α-Al2O3 micropowder, 2.95wt% of silicon micropowder, 17wt% of silicon carbide, 2wt% of calcium aluminate cement, 3wt% of a carbon source, 0.25wt% of the modified blast-resistant fibers obtained in step 1), 2wt% of a submicron composite antioxidant, 0.15wt% of aluminum powder, 0.15wt% of a polycarboxylate dispersant (FS20) and 60wt% of brown corundum particles are weighed as raw materials.

[0083] 3) The raw materials weighed in step 2) are uniformly mixed to obtain a premix;

[0084] 4) 4wt% of water based on the premix is added to the premix obtained in step 3) and uniformly mixed to obtain a wet mix, and the wet mix is cast and vibrated to form an iron runner castable containing modified blast-resistant fibers;

[0085] The casted castable is sequentially cured, dried and heat treated, and performance tests are conducted; wherein:

[0086] 1) The curing process is: curing at a temperature of 25°C and a humidity of 75% for 24h.

[0087] 2) The drying process is: drying at 110°C for 24h.

[0088] 3) Strength tests are conducted on the castable obtained in Example 3 after heat treatment at different temperatures:

[0089] ① In the heat treatment stage, the castable has a bending strength of 15MPa and a compressive strength of 98MPa under the condition of 1450°C for 3h; after the 900°C quenching experiment, the castable has a bending strength retention rate of 60% and a compressive strength retention rate of 88%.

[0090] ② In the heat treatment stage, the castable has a high-temperature bending strength of 5MPa under the condition of 1450°C for 0.5h.

[0091] 4) The explosion-proof performance test of the castable obtained in Example 3 was carried out: the experimental furnace was preheated to 600℃, and the sample did not burst within 30min of heat preservation in the furnace.

[0092] 5) The slag resistance test of the castable obtained in Example 3 was carried out: using static crucible method, under the condition of 1550℃ for 3h, the sample cross-section slag line erosion depth was 2.2mm.

[0093] 6) The oxidation resistance test of the castable obtained in Example 3 was carried out: after heat treatment at 1450℃ for 3h, the oxidation area ratio of the sample was 15%.

[0094] Comparative Example

[0095] A preparation method of an ordinary explosion-proof fiber-containing iron runner castable is provided, comprising the following steps:

[0096] 1) Weighing raw materials:

[0097] Weigh 7.5wt% of dense corundum fine powder, 5wt% of active α-Al2O3 micro powder, 2.95wt% of silicon micro powder, 17wt% of silicon carbide, 2wt% of calcium aluminate cement, 3wt% of carbon source, 0.25wt% of thermoplastic organic fiber used in Examples 1-3, 2wt% of submicron composite antioxidant, 0.15wt% of aluminum powder, 0.15wt% of polycarboxylate dispersant (FS20), and 60wt% of brown corundum particles as raw materials

[0098] 2) Mix the raw materials weighed in step 1) uniformly to obtain a premix;

[0099] 3) Add 4wt% of water to the premix obtained in step 2) and mix uniformly to obtain a wet mix, and the wet mix is poured and vibrated to form an iron runner castable;

[0100] The castable after molding is sequentially cured, dried and heat treated, and performance test is carried out; wherein:

[0101] 1) The curing process is: curing at a temperature of 25℃ and a humidity of 75% for 24h.

[0102] 2) The drying process is: drying at 110℃ for 24h.

[0103] 3) Strength test of the castable obtained in the comparative example after heat treatment at different temperatures:

[0104] ① In the heat treatment stage, the castable has a bending strength of 13.2MPa and a compressive strength of 86Mpa under the condition of 1450℃ for 3h, and after the 900℃ quenching experiment, the bending strength retention rate of the castable is 55%, and the compressive strength retention rate is 85%.

[0105] ② heat treatment stage, 1450℃ for 0.5h, the high temperature flexural strength of the castable is 4.1MPa.

[0106] 4) The explosion-proof performance test of the castable obtained in the comparative example is carried out: the experimental furnace is preheated to 600℃, and the sample is exploded within 20min in the furnace.

[0107] 5) The slag resistance test of the castable obtained in the comparative example is carried out: the static crucible method is adopted, and the sample is kept at 1550℃ for 3h, and the cross-section slag line erosion depth is 4mm.

[0108] 6) The oxidation resistance test of the castable obtained in the comparative example is carried out: after 1450℃ heat treatment for 3h, the oxidation area of the sample accounts for 21%.

[0109] The above is only the preferred specific embodiment of the present application, but the protection scope of the present application is not limited to this. Any skilled person in the art, according to the technical solution and the improvement concept of the present application, should be covered in the protection scope of the present application, which is equivalent to the replacement or change within the technical range disclosed by the present application.

Claims

1. A castable refractory for iron troughs comprising a modified blast- resistant fiber, characterized in that, The castable comprises the following components in percentage by mass: 4-10wt% of dense corundum fine powder, 3-8wt% of active α-Al2O3 micro powder, 1.5-4.5wt% of silicon micro powder, 12-25wt% of silicon carbide, 1.5-3wt% of calcium aluminate cement, 1.5-4wt% of carbon source, 2-3.5wt% of sub-micron composite antioxidant, 0.15-0.4wt% of modified anti-explosive fiber, 0.1-0.2wt% of aluminum powder, 0.05-0.2wt% of polycarboxylate dispersant, and the balance of brown corundum particles. The preparation method of the modified anti-explosive fiber is as follows: the thermoplastic organic fiber is immersed in a mixed solution composed of silane coupling agent, thermosetting phenolic resin and anhydrous ethanol for ultrasonic dispersion, and the modified anti-explosive fiber is obtained after drying.

2. A modified blast-resistant fiber-containing iron runner castable according to claim 1, characterized in that, The thermoplastic organic fiber is polyethylene fiber or polypropylene fiber, with a length of 5-8cm and a diameter of 15-40μm; the mass ratio of the silane coupling agent, the thermosetting phenolic resin and the anhydrous ethanol is 1:1:0.5-1; the ultrasonic dispersion time is 10-15 minutes; and the length of the modified anti-explosive fiber after cutting is 4-8mm.

3. A modified blast-resistant fiber-containing iron runner castable according to claim 1, characterized in that, The carbon source is one or a mixture of several of carbon black, flake graphite, artificial graphite and spherical pitch, wherein the carbon black is sub-micron carbon black, the particle size of the spherical pitch is ≤1mm, the particle size of the artificial graphite is ≤1mm, and the particle size of the flake graphite is 200 mesh.

4. The modified blast-resistant fiber-containing iron runner castable of claim 1, wherein, The sub-micron composite antioxidant is a mixture of at least two of titanium carbide, elemental silicon, zirconium boride and boron nitride; wherein the particle size of the TiC micro powder is <45μm; the particle size of the ZrB2 micro powder is <45μm; the particle size of the elemental Si powder is <45μm; and the particle size of the BN micro powder is <45μm.

5. The modified blast-resistant fiber-containing iron runner castable of claim 1, wherein, The content of Al2O3 in the dense corundum fine powder is >99wt%, and the particle size is <45μm; the content of Al2O3 in the active α-Al2O3 micro powder is >99.5wt%, and the particle size is <5μm; the content of SiO2 in the silicon micro powder is >95wt%, and the particle size is <0.5μm; the content of SiC in the silicon carbide is >98wt%, and the silicon carbide includes SiC fine powder and SiC particles, wherein the particle size of the SiC particles is 1-0.1mm, and the particle size of the SiC micro powder is <75μm; and the content of Al2O3 in the brown corundum particles is >95wt%, and the particle size includes 1-0.1mm, 3-1mm, 5-3mm and 8-5mm.

6. A modified blast-resistant fiber-containing iron runner castable according to claim 1, characterized in that, The content of Al2O3 in the calcium aluminate cement is >70wt%, and the particle size of the calcium aluminate cement is <45μm.

7. The modified blast-resistant fiber-containing iron runner castable of claim 1, wherein, The particle size of the aluminum powder is <75μm.

8. A process for the preparation of a modified blast-resistant fiber-containing iron runner castable according to any one of claims 1 to 7, characterized in that, The method comprises the following steps: (1) weighing the dense corundum fine powder, the active α-Al2O3 micro powder, the silicon micro powder, the silicon carbide, the calcium aluminate cement, the carbon source, the sub-micron composite antioxidant, the modified anti-explosive fiber, the aluminum powder, the polycarboxylate dispersant and the brown corundum particles, and mixing them uniformly to obtain a premix; (2) adding water accounting for 3-6wt% of the premix to the premix obtained in step (1) and mixing uniformly to obtain a wet mix, and pouring and vibrating the wet mix to form a modified anti-explosive fiber-containing iron channel castable after drying.

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