Sol-combined high-thermal-conductivity composite steel fiber toughened refractory castable and preparation method thereof

Abstract

The invention relates to the field of refractory materials, in particular to a sol-combined high-thermal-conductivity composite steel fiber toughened refractory castable and a preparation method thereof. The silicon carbide ceramic is prepared from the following raw materials in parts by mass: 40-60 parts of silicon carbide, 1-3 parts of graphite particles, 15-30 parts of steel fibers, 5-25 parts of tabular corundum, 3-5 parts of titanium nitride, 2-6 parts of fused quartz powder, 1-3 parts of silica powder, 0.17-0.30 part of a composite dispersing agent, 7.5-8.5 parts of a binding agent and 0.1-0.5 part of a hardening accelerator. The silica sol combined high-thermal-conductivity composite steel fiber toughened refractory castable for the blast furnace cooling wall, provided by the invention, has the advantages of easiness in slag adhesion, high strength, high wear resistance and capability of forming a tight combination body with the cooling wall; the method has remarkable effects of improving the slag adhering performance of the cooling wall area, prolonging the service life of the cooling wall and maintaining the blast furnace operation profile.

Description

Technical Field

[0001] The invention relates to the field of refractory materials, and in particular to a sol-bonded high-thermal-conductivity composite steel fiber toughened refractory castable and a preparation method thereof. Background Art

[0002] The cooling stave is an important cooling equipment of the blast furnace. It can effectively prevent the deformation and cracking of the furnace shell after being heated. Therefore, ensuring that the cooling stave is not damaged and in normal use is of great significance to the production and longevity of the blast furnace. At present, the copper cooling stave brick structure has been widely used in the waist, belly and lower part of the furnace body of the blast furnace. During the operation of the blast furnace, the hot surface temperature of the copper cooling stave is required to be less than 230℃. A layer of slag skin protection layer with appropriate thickness and stable existence is required to reduce the heat loss of the cooling stave area. In the actual use process, the existing cooling stave bricks with dovetail grooves cannot be integrated with the cooling stave. Under the impact of the edge gas flow and the charge on the cooling stave bricks, the cooling stave bricks fall off one after another after a period of use. The cooling stave is not protected by the bricks and is completely impacted by the charge and gas flow. It is very easy to be damaged and leaked, and in severe cases, it may even cause the furnace wall to burn through.

[0003] Aiming at the problem that the bricks on the inner surface of the cooling wall cannot be integrated with the cooling wall, are easy to fall off, and cannot better protect the cooling wall, a new sol-bonded high steel fiber toughened refractory castable is urgently needed in this field. Summary of the invention

[0004] In order to solve the above technical problems, the present invention provides a method for preparing a silica sol combined with a high thermal conductivity composite steel fiber toughened refractory castable for a blast furnace cooling wall.

[0005] Specifically, the sol-bonded high thermal conductivity composite steel fiber toughened refractory castable provided in the first aspect of the present invention is prepared from the following raw materials in parts by mass: 40 to 60 parts of silicon carbide, 1 to 3 parts of graphite particles, 15 to 30 parts of steel fibers, 5 to 25 parts of plate-shaped corundum, 3 to 5 parts of titanium nitride, 2 to 6 parts of fused quartz powder, 1 to 3 parts of silicon micropowder, 0.17 to 0.30 parts of composite dispersant, 7.5 to 8.5 parts of binder, and 0.1 to 0.5 parts of hardening accelerator. The present invention discloses a silica sol combined with a high thermal conductivity composite steel fiber toughened refractory castable for blast furnace cooling staves, which takes a certain amount of silicon carbide, graphite particles, steel fibers, corundum, titanium nitride, fused quartz, silicon micropowder, aluminum oxide micropowder, composite dispersant, binder and hardening accelerator as main raw materials. The castable has the advantages of easy slagging, high strength, high wear resistance and the ability to form a close combination with the cooling stave, and has obvious effects on improving the slagging performance of the cooling stave area, extending the service life of the cooling stave and maintaining the operating furnace type of the blast furnace.

[0006] Preferably, the particle size of the silicon carbide is 0-3 mm, the mass content of silicon carbide is ≥97%, and the mass content of ferric oxide is ≤0.6%.

[0007] More preferably, the binder is silica sol with a concentration of 35-45%.

[0008] Preferably, the graphite particles have a particle size of 2-4 mm and a carbon content of ≥95%.

[0009] Preferably, the steel fiber is 446 steel fiber, with a Cr content of 22% to 27%, a Ni content of 18% to 22%, a Mn content of ≤2.5%, a Si content of ≤2.5%, and a C content of ≤0.2%.

[0010] Preferably, the plate-like corundum has a particle size of 0-6 mm, Al2O3≥99%, and Fe2O3≤0.1%.

[0011] Preferably, the particle size of the titanium nitride is ≤0.074 mm, and TiN ≥98%.

[0012] Preferably, the particle size of the fused quartz powder is ≤0.074 mm, and SiO2 is ≥99%.

[0013] Preferably, the silicon powder is obtained by collecting gaseous silicon dioxide discharged through a flue in a process including smelting ferrosilicon alloy and / or metallic silicon, wherein SiO2≥95%, Fe2O3≤0.3%, 45 micron sieve residue≤0.6%, and ignition loss≤1%.

[0014] Preferably, the composite admixture is obtained by mixing naphthalenesulfonate formaldehyde condensate and sodium tripolyphosphate; preferably, the mass ratio of the sodium tripolyphosphate to the naphthalenesulfonate formaldehyde condensate is 2-3:1.

[0015] Preferably, the hardening accelerator is 200 mesh 97 high purity fused magnesia, with MgO≥97%, Fe2O3≤0.5%, SiO2≤1%, and CaO≤1.5%.

[0016] In the present invention, by optimizing the addition amounts of silicon carbide, graphite particles and steel fibers, the thermal conductivity of the material can be improved, thereby improving the slag performance of the material.

[0017] Preferably, it is prepared from the following raw materials in parts by mass: 40 to 60 parts of silicon carbide, 1 to 3 parts of graphite particles, 15 to 30 parts of steel fibers, 5 to 25 parts of plate-like corundum, 3 to 5 parts of titanium nitride, 2 to 6 parts of fused quartz powder, 1 to 3 parts of silicon micropowder, 0.05 to 0.10 parts of naphthalenesulfonate formaldehyde condensate, 0.10 to 0.20 parts of sodium tripolyphosphate, 7.5 to 8.5 parts of a binder, and 0.1 to 0.5 parts of a hardening accelerator.

[0018] Further preferably, it is prepared from the following raw materials in parts by mass: 50 to 60 parts of silicon carbide, 2 to 3 parts of graphite particles, 20 to 30 parts of steel fibers, 5 to 25 parts of plate-like corundum, 3 to 5 parts of titanium nitride, 2 to 6 parts of fused quartz powder, 1 to 3 parts of silicon micropowder, 0.05 to 0.10 parts of naphthalenesulfonate formaldehyde condensate, 0.10 to 0.20 parts of sodium tripolyphosphate, 7.5 to 8.5 parts of a binder, and 0.15 to 0.50 parts of a hardening accelerator.

[0019] Preferably, the bulk density of the sol-bonded high thermal conductivity composite steel fiber toughened refractory castable after baking at 110°C × 24h is 3.10-3.30 g / cm 3 The flexural strength of the sample after sintering at 1100℃×3h is 30~50MPa, the compressive strength is 130~200MPa, the thermal conductivity at 1000℃ is 15~30W / m•K, and the wear resistance of the sample sintered at 1100℃×3h is 2~5cm 3 .

[0020] Further preferably, the bulk density of the sol-bonded high thermal conductivity composite steel fiber toughened refractory castable after baking at 110°C × 24h is 3.15-3.30 g / cm 3 After sintering at 1100℃×3h, the flexural strength is 40~50MPa, the compressive strength is 140~200MPa, the thermal conductivity at 1000℃ is 18~30W / m•K, and the wear resistance of the sample after sintering at 1100℃×3h is 2~4cm 3 .

[0021] In the second aspect, the preparation method of the sol-bonded high thermal conductivity composite steel fiber toughened refractory castable provided by the present invention comprises weighing various raw materials according to a ratio, mixing and stirring to obtain a castable; vibrating the castable into shape; curing the sample after vibration forming; and drying the cured sample to obtain the sol-bonded high thermal conductivity composite steel fiber toughened refractory castable.

[0022] Preferably, the curing is natural curing at 20-30°C for 18-36 hours; and / or the drying temperature is 90-120°C for 18-36 hours.

[0023] In a third aspect, the present invention provides the use of the sol-bonded high thermal conductivity composite steel fiber toughened refractory castable or the sol-bonded high thermal conductivity composite steel fiber toughened refractory castable prepared by the preparation method of the sol-bonded high thermal conductivity composite steel fiber toughened refractory castable in blast furnace cooling walls.

[0024] The beneficial effect of the present invention is at least that: the present invention provides a silica sol combined with a high thermal conductivity composite steel fiber toughened refractory castable for a blast furnace cooling wall, which can be integrated with the cooling wall through an anchor, thereby avoiding damage to the cooling wall refractory material caused by shear stress generated by the mutual displacement of the refractory material and the cooling wall. The product uses high thermal conductivity silicon carbide, graphite particles, steel fibers, etc. as main raw materials, so its thermal conductivity is relatively high, and a small amount of fused quartz powder is introduced, so that the product has excellent slag hanging performance, so that a stable slag protective layer can be formed during use. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be described clearly and completely below. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0026] If no specific technology or conditions are specified in the embodiments of the present invention, the technology or conditions described in the literature in this field or the product instructions are used. If the manufacturer of the devices, instruments, reagents, etc. is not specified, they are all conventional products that can be purchased through regular channels. The raw materials used in the present invention can be easily purchased in the domestic product market.

[0027] In the embodiment of the present invention, the steel fiber used is 446 melt-drawn heat-resistant stainless steel fiber, with a Cr content of 22% to 27%, a Ni content of 18% to 22%, a Mn content of ≤2.5%, a Si content of ≤2.5%, and a C content of ≤0.2%; the mass content of silicon carbide in the 97 silicon carbide used is ≥97%, and the mass content of ferric oxide is ≤0.6%; the carbon content of the graphite particles is ≥95%; Al2O3 is ≥99% and Fe2O3 is ≤0.1% in the plate-like corundum used; the particle size of the titanium nitride used is ≤0.074mm, and TiN is ≥98%; the particle size of the fused quartz powder used is ≤0.074mm, and SiO2 is ≥99%; the silicon micropowder used has SiO2 ≥95%, Fe2O3 ≤0.3%, 45 micron sieve residue ≤0.6%, and ignition loss ≤1%. The naphthalenesulfonate formaldehyde condensate used is a yellow-brown powder, with a 0.315mm sieve residue ≤12% and a sodium sulfate content ≤5%; the sodium tripolyphosphate used is a commercially available white powder industrial product; the 200-mesh 97 high-purity fused magnesia used has MgO ≥97%, Fe2O3 ≤0.5%, SiO2 ≤1%, and CaO ≤1.5%.

[0028] Example 1

[0029] a. The silica sol combined with high thermal conductivity composite steel fiber toughening refractory castable for blast furnace cooling stave of the present invention is expressed by mass fractions, comprising 15 parts of 3-5 mm plate-shaped corundum, 7 parts of 325 mesh plate-shaped corundum, 22 parts of 1-3 mm 97 silicon carbide, 22 parts of 0-1 mm 97 silicon carbide, 5 parts of 200 mesh 97 silicon carbide, 2 parts of 2-4 mm graphite particles, 15 parts of 12 mm long 446 steel fiber, 5 parts of 19 mm long 446 steel fiber, 3 parts of 200 mesh titanium nitride, 2 parts of 180 mesh fused quartz powder, 2 parts of 95 silicon powder, 0.05 parts of naphthalenesulfonate formaldehyde condensate, 0.12 parts of sodium tripolyphosphate, and 0.2 parts of 200 mesh 97 high-purity fused magnesia. The binder used in the material is 40% silica sol, which is added in an amount of 7.8 parts, and is added in an external manner.

[0030] b. Weigh each raw material according to the above ratio.

[0031] c. Mix the weighed raw materials, naphthalenesulfonate formaldehyde condensate and sodium tripolyphosphate, pour the mixture into a stirring pot after mixing evenly, then add silica sol and stir evenly to obtain a uniformly mixed casting material.

[0032] d. Vibrate the evenly mixed casting material into shape.

[0033] e. The formed specimens are naturally cured at 20℃~30℃ for 24 hours.

[0034] f. Dry the sample obtained by demoulding after curing (drying temperature is 110℃, drying time is 24h) to obtain the baked sample of silica sol combined with high thermal conductivity composite steel fiber toughened refractory castable. Burn it at 1100℃×3h to obtain the burned sample of silica sol combined with high thermal conductivity composite steel fiber toughened refractory castable.

[0035] g, the bulk density of the dried sample is 3.14 g / cm 3 The flexural strength of the sample after sintering at 1100℃×3h is 37MPa, and the compressive strength is 140MPa; the thermal conductivity at 1000℃ is 17.20W / m•K; the wear resistance value of the sample after sintering at 1100℃×3h is 3.72cm 3 .

[0036] Example 2

[0037] a. The silica sol combined with high thermal conductivity composite steel fiber toughening refractory castable for blast furnace cooling stave of the present invention is expressed by mass fraction, comprising 10 parts of 3-5 mm plate-shaped corundum, 7 parts of 325 mesh plate-shaped corundum, 22 parts of 1-3 mm 97 silicon carbide, 22 parts of 0-1 mm 97 silicon carbide, 5 parts of 200 mesh 97 silicon carbide, 2 parts of 2-4 mm graphite particles, 22 parts of 12 mm long 446 steel fiber, 3 parts of 19 mm long 446 steel fiber, 3 parts of 200 mesh titanium nitride, 2 parts of 180 mesh fused quartz powder, 2 parts of 95 silicon powder, 0.05 parts of naphthalenesulfonate formaldehyde condensate, 0.12 parts of sodium tripolyphosphate, and 0.2 parts of 200 mesh 97 high-purity fused magnesia. The binder used in the material is 40% silica sol, and the addition amount is 8.0 parts.

[0038] b. Weigh each raw material according to the above ratio.

[0039] c. Mix the weighed raw materials, naphthalenesulfonate formaldehyde condensate and sodium tripolyphosphate, pour the mixture into a stirring pot after mixing evenly, then add silica sol and stir evenly to obtain a uniformly mixed casting material.

[0040] d. Vibrate the evenly mixed casting material into shape.

[0041] e. The formed specimens are naturally cured at 20℃~30℃ for 24 hours.

[0042] f. Dry the sample obtained by demoulding after curing (drying temperature is 110℃, drying time is 24h) to obtain the product sample of silica sol combined with high thermal conductivity composite steel fiber toughened refractory castable. Burn it at 1100℃×3h to obtain the burned sample of silica sol combined with high thermal conductivity composite steel fiber toughened refractory castable.

[0043] g, the bulk density of the dried sample is 3.17 g / cm 3 The flexural strength of the sample after sintering at 1100℃×3h is 41MPa, and the compressive strength is 158MPa; the thermal conductivity at 1000℃ is 21.09W / m•K; the wear resistance value of the sample after sintering at 1100℃×3h is 2.83cm 3 .

[0044] Example 3

[0045] a. The silica sol combined with high thermal conductivity composite steel fiber toughening refractory castable for blast furnace cooling stave of the present invention is expressed by mass fraction, comprising 6 parts of 3-5mm plate-shaped corundum, 5 parts of 325 mesh plate-shaped corundum, 23 parts of 1-3mm 97 silicon carbide, 23 parts of 0-1mm 97 silicon carbide, 7 parts of 200 mesh 97 silicon carbide, 2 parts of 2-4mm graphite particles, 24 parts of 12mm-length 446 steel fiber, 3 parts of 19mm-length 446 steel fiber, 3 parts of 200 mesh titanium nitride, 2 parts of 180 mesh fused quartz powder, 2 parts of 95 silicon powder, 0.05 parts of naphthalenesulfonate formaldehyde condensate, 0.12 parts of sodium tripolyphosphate, and 0.2 parts of 200 mesh 97 high-purity fused magnesia. The binder used in the material is 40% silica sol, which is added in an amount of 8.0 parts and is added in an external manner; b. Weigh each raw material according to the above ratio.

[0046] c. Mix the weighed raw materials, naphthalenesulfonate formaldehyde condensate and sodium tripolyphosphate, pour the mixture into a stirring pot after mixing evenly, then add silica sol and stir evenly to obtain a uniformly mixed casting material.

[0047] d. Vibrate the evenly mixed casting material into shape.

[0048] e. The formed specimens are naturally cured at 20℃~30℃ for 24 hours.

[0049] f. Dry the sample obtained by demoulding after curing (drying temperature is 110℃, drying time is 24h) to obtain the baked sample of silica sol combined with high thermal conductivity composite steel fiber toughened refractory castable. Burn it at 1100℃×3h to obtain the burned sample of silica sol combined with high thermal conductivity composite steel fiber toughened refractory castable.

[0050] The bulk density of the dried sample is 3.20 g / cm 3 The flexural strength of the sample after sintering at 1100℃×3h is 48MPa, and the compressive strength is 161MPa; the thermal conductivity at 1000℃ is 22.16W / m•K; the wear resistance of the sample after sintering at 1100℃×3h is 2.24cm 3 Comparative Example 1

[0051] a. The silica sol combined with high thermal conductivity composite steel fiber toughening refractory castable for blast furnace cooling stave of the present invention is expressed by mass fractions, comprising 15% of 3-5mm plate corundum, 12% of 1-3mm plate corundum, 7% of 325 mesh plate corundum, 22% of 1-3mm 97 silicon carbide, 22% of 0-1mm 97 silicon carbide, 5% of 200 mesh 97 silicon carbide, 5% of 12mm long 446 steel fiber, 5% of 19mm long 446 steel fiber, 3% of 200 mesh titanium nitride, 2% of 180 mesh fused quartz powder, 2% of 95 silicon powder, 0.05% of naphthalenesulfonate formaldehyde condensate, 0.12% of sodium tripolyphosphate, and 0.2 part of 200 mesh 97 high-purity fused magnesia. The binder used in the material is 40% silica sol, and the addition amount is 8.3%.

[0052] b. Weigh each raw material according to the above ratio.

[0053] c. Mix the weighed raw materials, naphthalenesulfonate formaldehyde condensate and sodium tripolyphosphate, pour the mixture into a stirring pot after mixing evenly, then add silica sol and stir evenly to obtain a uniformly mixed casting material.

[0054] d. Vibrate the evenly mixed casting material into shape.

[0055] e. The formed specimens are naturally cured at 20℃~30℃ for 24 hours.

[0056] f. Dry the sample obtained by demoulding after curing (drying temperature is 110℃, drying time is 24h) to obtain a silica sol combined with refractory castable sample. After sintering at 1100℃×3h, a fired sample of silica sol combined with high thermal conductivity composite steel fiber toughened refractory castable is obtained.

[0057] g, the bulk density of the dried sample is 3.07 g / cm 3 The flexural strength of the sample after sintering at 1100℃×3h is 31MPa, the compressive strength is 122MPa, and the thermal conductivity at 1000℃ is 15.18W / m•K; the wear resistance value of the sample after sintering at 1100℃×3h is 4.57cm 3 .

[0058] Comparative Example 2

[0059] a. The silica sol combined with high thermal conductivity composite steel fiber toughened refractory castable for blast furnace cooling stave of the present invention is expressed by mass fraction, comprising 20% ​​of 3-5mm plate corundum, 17% of 1-3mm plate corundum, 7% of 325 mesh plate corundum, 22% of 1-3mm 97 silicon carbide, 22% of 0-1mm 97 silicon carbide, 5% of 200 mesh 97 silicon carbide, 3% of 200 mesh titanium nitride, 2% of 180 mesh fused quartz powder, 2% of 95 silicon powder, 0.05% of naphthalenesulfonate formaldehyde condensate, 0.12% of sodium tripolyphosphate, and 0.2 parts of 200 mesh 97 high-purity fused magnesia. The binder used in the material is 40% silica sol, and the addition amount is 8.3%.

[0060] b. Weigh each raw material according to the above ratio.

[0061] c. Mix the weighed raw materials, naphthalenesulfonate formaldehyde condensate and sodium tripolyphosphate, pour the mixture into a stirring pot after mixing evenly, then add silica sol and stir evenly to obtain a uniformly mixed casting material.

[0062] d. Vibrate the evenly mixed casting material into shape.

[0063] e. The formed specimens are naturally cured at 20℃~30℃ for 24 hours.

[0064] f. Dry the sample obtained by demoulding after curing (drying temperature is 110°C, drying time is 24h) to obtain a silica sol bonded refractory castable sample. Firing at 1100°C × 3h to obtain a fired sample of the silica sol bonded refractory castable.

[0065] g, the bulk density of the dried sample is 3.03 g / cm 3 The flexural strength of the sample after sintering at 1100℃×3h is 17MPa, the compressive strength is 102MPa, and the thermal conductivity at 1000℃ is 7.18W / m•K; the wear resistance value of the sample after sintering at 1100℃×3h is 5.69cm 3 .

[0066] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A sol-bonded high thermal conductivity composite steel fiber toughened refractory castable, characterized in that: The invention is prepared from the following raw materials in parts by weight: 40 to 60 parts of silicon carbide, 1 to 3 parts of graphite particles, 15 to 30 parts of steel fibers, 5 to 25 parts of plate-shaped corundum, 3 to 5 parts of titanium nitride, 2 to 6 parts of fused quartz powder, 1 to 3 parts of silicon micropowder, 0.17 to 0.30 parts of composite dispersant, 7.5 to 8.5 parts of binder and 0.1 to 0.5 parts of hardening accelerator.

2. The sol-bonded high thermal conductivity composite steel fiber toughened refractory castable according to claim 1, characterized in that: The particle size of the silicon carbide is 0-3 mm, the mass content of silicon carbide is ≥97%, and the mass content of ferric oxide is ≤0.6%; And / or, the binder is silica sol with a concentration of 35-45%.

3. The sol-bonded high thermal conductivity composite steel fiber toughened refractory castable according to claim 1, characterized in that: The graphite particles have a particle size of 2-4 mm and a carbon content of ≥95%; And / or, the steel fiber is 446 steel fiber, with a Cr content of 22% to 27%, a Mn content of ≤1.5%, a Si content of ≤2.5%, a C content of ≤0.25%, and a melting point of ≥1450°C.

4. The sol-bonded high thermal conductivity composite steel fiber toughened refractory castable according to claim 1, characterized in that: The plate-shaped corundum has a particle size of 0-6 mm, Al2O3 ≥ 99%, and Fe2O3 ≤ 0.1%; And / or, the particle size of the titanium nitride is ≤0.074 mm, and TiN ≥98%; And / or, the particle size of the fused quartz powder is ≤0.074 mm, and SiO2 is ≥99%.

5. The sol-bonded high thermal conductivity composite steel fiber toughened refractory castable according to claim 1, characterized in that: The silicon powder is obtained by collecting gaseous silicon dioxide discharged through the flue in the process of smelting ferrosilicon alloy and / or metallic silicon, wherein SiO2 is ≥ 95%, Fe2O3 is ≤ 0.3%, 45 micron sieve residue is ≤ 0.6%, and ignition loss is ≤ 1%; And / or, the composite admixture is obtained by mixing naphthalenesulfonate formaldehyde condensate and sodium tripolyphosphate; preferably, the mass ratio of the sodium tripolyphosphate to the naphthalenesulfonate formaldehyde condensate is 2-3:

1. And / or, the hardening accelerator is 200 mesh 97 high purity fused magnesia, MgO≥97%, Fe2O3≤0.5%, SiO2≤1%, CaO≤1.5%.

6. The sol-bonded high thermal conductivity composite steel fiber toughened refractory castable according to any one of claims 1 to 5, characterized in that: The invention is prepared from the following raw materials in parts by mass: 40 to 60 parts of silicon carbide, 1 to 3 parts of graphite particles, 15 to 30 parts of steel fibers, 5 to 25 parts of plate-shaped corundum, 3 to 5 parts of titanium nitride, 2 to 6 parts of fused quartz powder, 1 to 3 parts of silicon micropowder, 0.05 to 0.10 parts of naphthalenesulfonate formaldehyde condensate, 0.10 to 0.20 parts of sodium tripolyphosphate, 7.5 to 8.5 parts of binder and 0.1 to 0.5 parts of hardening accelerator.

7. The sol-bonded high thermal conductivity composite steel fiber toughened refractory castable according to any one of claims 1 to 6, characterized in that: The bulk density of the sol-bonded high thermal conductivity composite steel fiber toughened refractory castable after baking at 110°C×24h is 3.10-3.30 g / cm 3 The flexural strength of the sample after sintering at 1100℃×3h is 30~50MPa, the compressive strength is 130~200MPa, the thermal conductivity at 1000℃ is 15~30W / m•K, and the wear resistance of the sample sintered at 1100℃×3h is 2~5cm 3 .

8. The method for preparing the sol-bonded high thermal conductivity composite steel fiber toughened refractory castable according to any one of claims 1 to 7, characterized in that: The method comprises weighing various raw materials according to a proportion, mixing and stirring to obtain a casting material; vibrating and molding the casting material; curing the vibration-molded sample; and drying the cured sample to obtain the sol-bonded high-thermal-conductivity composite steel fiber toughened refractory casting material.

9. The method for preparing the sol-bonded high thermal conductivity composite steel fiber toughened refractory castable according to claim 8, characterized in that: The curing is natural curing at 20-30°C for 18-36h; and / or the drying temperature is 90-120°C for 18-36h.

10. Use of the sol-bonded high thermal conductivity composite steel fiber toughened refractory castable prepared by the preparation method of the sol-bonded high thermal conductivity composite steel fiber toughened refractory castable as described in any one of claims 1 to 7 or the sol-bonded high thermal conductivity composite steel fiber toughened refractory castable as described in claim 8 or 9 in blast furnace cooling walls.