Low-carbon aluminous silicon carbide brick for a ladle and a method for manufacturing the same

Abstract

The application belongs to the technical field of refractory materials, and discloses a low-carbon aluminum silicon carbide brick for a ladle and a preparation method thereof. The low-carbon aluminum silicon carbide brick comprises the following raw materials in parts by mass: dense corundum 40-60 parts, kyanite 10-20 parts, silicon carbide 5-15 parts, graphite 3-6 parts, graphene oxide 3-6 parts, metal silicon powder 0.5-2 parts, lanthanum oxide 0.5-2 parts, zirconium carbide 1-4 parts, and phenolic resin 4-7 parts. The low-carbon aluminum silicon carbide brick produced finally has a low porosity, excellent oxidation resistance, corrosion resistance, slag resistance and good thermal shock stability, and can effectively reduce the energy consumption of iron smelting and has a long service life as a lining material for a ladle.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of refractory materials, and particularly relates to a low-carbon aluminum silicon carbide brick for a ladle and a preparation method thereof. BACKGROUND

[0002] The aluminum silicon carbide carbon brick is a high-temperature formed unburned product, most of which adopts corundum, silicon carbide and graphite as main raw materials and adds appropriate additives, and is mainly applied to the inner lining of a ladle and a torpedo. The ladle, as a special equipment for storing and transporting molten iron, has always played a vital role in the iron-making industry, and the performance of the refractory material for the inner lining of the ladle will directly affect the quality and service life of the ladle. With the continuous development of the iron-making industry, people have higher requirements for the ladle brick.

[0003] Since the ladle works in an alternating state of high temperature and low temperature, the inner lining of the ladle is prone to erosion and peeling under the continuous erosion of the molten iron, which will shorten the service life of the ladle and increase the maintenance cost. Since the aluminum silicon carbide carbon brick is a carbon-containing refractory material, it is easy to be oxidized at high temperature, and after oxidation, the structure of the aluminum silicon carbide carbon brick will be destroyed, holes and peeling will occur, and the disintegration of the aluminum silicon carbide carbon brick will be accelerated. At the same time, after the structure of the brick body is destroyed and disintegrated, its excellent thermal shock stability will also be lost. Therefore, it is urgent to develop an aluminum silicon carbide carbon brick with oxidation resistance, erosion resistance and good thermal shock stability. SUMMARY

[0004] The technical problem to be solved by the present application is to provide a low-carbon aluminum silicon carbide brick for a ladle and a preparation method thereof to solve the problems existing in the prior art. The present application adopts dense corundum and kyanite with a specific particle size distribution, selects graphite and graphene oxide as the carbon source, and introduces silicon powder, lanthanum oxide and zirconium carbide as additives. The finally produced low-carbon aluminum silicon carbide brick has a low porosity, excellent oxidation resistance, erosion resistance, slag resistance and good thermal shock stability.

[0005] To solve the technical problems proposed in the present application, the present application provides a low-carbon aluminum silicon carbide brick for a ladle, which comprises the following raw materials in mass fraction: 40-60 parts of dense corundum, 10-20 parts of kyanite, 5-15 parts of silicon carbide, 3-6 parts of graphite, 3-6 parts of graphene oxide, 0.5-2 parts of silicon powder, 0.5-2 parts of lanthanum oxide, 1-4 parts of zirconium carbide and 4-7 parts of phenolic resin.

[0006] In the above scheme, the dense corundum comprises the following mass fractions of dense corundum with different particle sizes: 10-15 parts of dense corundum with a particle size of 5-3 mm, 10-15 parts of dense corundum with a particle size of 3-1 mm, 10-15 parts of dense corundum with a particle size of 1-0.1 mm, and 10-15 parts of dense corundum with a particle size of 200-250 mesh.

[0007] In the above scheme, the kyanite comprises kyanite of different particle sizes in the following mass fractions: 3-6 parts of kyanite with a particle size of 3-1 mm, 3-6 parts of kyanite with a particle size of 1-0.1 mm, and 4-8 parts of kyanite with a particle size of 200-250 mesh.

[0008] In the above scheme, the Al2O3 content in the dense corundum is ≥ 97 wt%.

[0009] In the above scheme, the sum of the Al2O3 and SiO2 contents in the kyanite is ≥ 98 wt%.

[0010] In the above scheme, the SiC content in the silicon carbide is ≥ 98 wt%.

[0011] In the above scheme, the particle size of the silicon carbide is 100-120 mesh.

[0012] In the above scheme, the particle size of the graphite is 180-200 mesh.

[0013] In the above scheme, the particle size of the graphene oxide is 180-200 mesh.

[0014] In the above scheme, the particle size of the metallic silicon powder is 180-200 mesh.

[0015] In the above scheme, the particle size of the lanthanum oxide is 260-300 mesh.

[0016] In the above scheme, the particle size of the zirconium carbide is 80-100 mesh.

[0017] The application also provides a preparation method of the low-carbon aluminum silicon carbide brick for a ladle, comprising the following steps:

[0018] 1) Preheat the dense corundum of each particle size, the kyanite of each particle size, the silicon carbide, the graphite, the graphene oxide, and the phenolic resin to 40-50℃ respectively;

[0019] 2) Add the dense corundum with a particle size of 5-3 mm, the dense corundum with a particle size of 3-1 mm, the kyanite of each particle size, and the silicon carbide into a mixing machine for primary stirring, then add the dense corundum with a particle size of 1-0.1 mm, the dense corundum with a particle size of 200-250 mesh, the graphite, the graphene oxide, the metallic silicon powder, the lanthanum oxide, the zirconium carbide, and the phenolic resin for secondary stirring to obtain a mixed mud;

[0020] 3) Press the mixed mud into a green body, then bake and solidify to obtain the low-carbon aluminum silicon carbide brick for a ladle.

[0021] The stirring speed of the mixing machine is 970-1000 r / min, the first stirring time is 4-6 min, and the second stirring time is 10-15 min.

[0022] In the scheme, the bulk density of the green brick is 2.65-2.75 g / cm 3 .

[0023] In the scheme, the temperature of the baking and curing is 200-240 DEG C, and the time is 18-24 h.

[0024] In the scheme, the apparent porosity of the low-carbon aluminum silicon carbide brick is 8.1-8.5%, the bulk density is 2.84-2.90 g / cm 3 , the cold compressive strength is 54.6-58.9 MPa, the 0.2 MPa load softening starting temperature is 1475-1490 DEG C, and the thermal shock resistance (1100 DEG C water cooling) is 6-8 times.

[0025] Compared with the prior art, the beneficial effects of the application are:

[0026] Based on the demand for improving the oxidation resistance, erosion resistance, slag resistance and thermal shock resistance of the low-carbon aluminum silicon carbide brick, the application adopts dense corundum and kyanite with specific particle size distribution, selects graphite and graphene oxide as carbon sources, and introduces metal silicon powder, lanthanum oxide and zirconium carbide as additives:

[0027] Firstly, the surface of graphene oxide contains a large number of oxygen-containing functional groups and has excellent oxidation resistance; lanthanum oxide has high catalytic performance and can convert carbon and sulfur in molten iron into carbon dioxide and sulfur dioxide respectively, thereby improving the quality of iron products, promoting the conversion of carbon monoxide in molten iron into carbon dioxide, reducing potential safety hazards in the ironmaking process, and reducing the harm to human health;

[0028] Meanwhile, graphene oxide and lanthanum oxide have a synergistic promotion effect; at high temperature, lanthanum oxide can form a complex with the carboxyl groups in graphene oxide in multiple ways, and this complex has strong structural stability; since graphene oxide has a very large specific surface area, the lanthanum oxide coordinated with it is uniformly dispersed therein, and a larger specific surface area and more adsorption sites can be obtained, thereby having stronger catalytic activity and improving the catalytic efficiency;

[0029] However, at the interface rich in oxygen (such as the interface between molten iron and an iron ladle), lanthanum oxide also promotes the oxidation of graphite, another carbon source in the low-carbon aluminum silicon carbide brick, therefore, by controlling the amount of lanthanum oxide and using graphene oxide with stronger oxidation resistance to coordinate with it, the direct contact area of lanthanum oxide and graphite is greatly reduced, and the oxidation of the carbon source in the material is prevented;

[0030] In addition, the polymer complex formed by lanthanum oxide and graphene oxide has strong intensity and is uniformly dispersed in the matrix, greatly reducing the stress generated when the refractory material changes in volume, inhibiting the growth and aggregation of microcracks, improving the strength and structural stability of the refractory material, and enhancing the crack resistance of the refractory material.

[0031] Zirconium carbide has extremely high hardness and melting point, can enhance the thermal shock stability of the material, and the addition of zirconium carbide can also increase the density of the material, reduce the porosity, and improve the oxidation resistance of the material; in addition, kyanite will form a relatively soft and viscous siliceous liquid phase at high temperature, and after being combined with zirconium carbide with extremely low thermal expansion coefficient, it produces heterogeneous dispersion strengthening and toughening, further improving the strength and toughness of the material.

[0032] Through the combined action of the above components, the low-carbon aluminum silicon carbide brick finally produced has low porosity, excellent oxidation resistance, erosion resistance, slag resistance, and good thermal shock stability, and as a ladle lining material, it can not only effectively reduce the energy consumption of ironmaking, but also has a long service life. DETAILED DESCRIPTION

[0033] In order to better understand the present application, the following examples further illustrate the content of the present application, but the content of the present application is not limited to the following examples.

[0034] In the following examples, the Al2O3 content in dense corundum is ≥97wt%; the sum of Al2O3 and SiO2 content in kyanite is ≥98wt%; the particle size of silicon carbide is 100-120 mesh, and the SiC content is ≥98wt%; the particle size of graphite is 180-200 mesh; the particle size of graphene oxide is 180-200 mesh; the particle size of metallic silicon powder is 180-200 mesh; the particle size of lanthanum oxide is 260-300 mesh; and the particle size of zirconium carbide is 80-100 mesh.

[0035] Example 1

[0036] The low-carbon aluminum silicon carbide brick for a ladle in this example includes the following raw materials in mass parts:

[0037] 12 parts of dense corundum with a particle size of 5-3mm, 13 parts of dense corundum with a particle size of 3-1mm, 12 parts of dense corundum with a particle size of 1-0.1mm, 13 parts of dense corundum with a particle size of 200-250 mesh, 4 parts of kyanite with a particle size of 3-1mm, 4 parts of kyanite with a particle size of 1-0.1mm, 5 parts of kyanite with a particle size of 200-250 mesh, 10 parts of silicon carbide, 4 parts of graphite, 5 parts of graphene oxide, 1 part of metallic silicon powder, 1 part of lanthanum oxide, 2 parts of zirconium carbide, and 5 parts of thermosetting phenolic resin.

[0038] The preparation method of the low-carbon aluminum silicon carbide brick for a ladle in this example includes the following steps:

[0039] 1) Preheat each particle size of dense corundum, each particle size of kyanite, silicon carbide, graphite, graphene oxide and thermosetting phenolic resin to 40-50℃ respectively;

[0040] 2) Add particle size 5-3mm of dense corundum, particle size 3-1mm of dense corundum, each particle size of kyanite and silicon carbide into a mixer with rotation speed of 970-1000r / min and stir for 4-6min, then add particle size 1-0.1mm of dense corundum, particle size 200-250mesh of dense corundum, graphite, graphene oxide, metallic silicon powder, lanthanum oxide, zirconium carbide and thermosetting phenolic resin and stir for 10-15min to obtain mixed mud;

[0041] 3) Press the mixed mud into a brick blank by a press machine, the pressure of the press machine is 900t, the bulk density of the obtained brick blank is 2.71g / cm 3 , the obtained brick blank is baked and solidified at 210℃ for 18h, taken out after natural cooling to room temperature to obtain the low-carbon aluminum carbide silicon brick for ladle.

[0042] Example 2

[0043] The low-carbon aluminum carbide silicon brick for ladle in this example comprises the following raw materials in mass fraction:

[0044] Particle size 5-3mm of dense corundum 14 parts, particle size 3-1mm of dense corundum 14 parts, particle size 1-0.1mm of dense corundum 10 parts, particle size 200-250mesh of dense corundum 11 parts, particle size 3-1mm of kyanite 3 parts, particle size 1-0.1mm of kyanite 4 parts, particle size 200-250mesh of kyanite 6 parts, silicon carbide 10 parts, graphite 4 parts, graphene oxide 5 parts, metallic silicon powder 1 part, lanthanum oxide 1 part, zirconium carbide 2 parts, thermosetting phenolic resin 5 parts.

[0045] The preparation method of the low-carbon aluminum carbide silicon brick for ladle in this example comprises the following steps:

[0046] 1) Preheat each particle size of dense corundum, each particle size of kyanite, silicon carbide, graphite, graphene oxide and thermosetting phenolic resin to 40-50℃ respectively;

[0047] 2) Add particle size 5-3mm of dense corundum, particle size 3-1mm of dense corundum, each particle size of kyanite and silicon carbide into a mixer with rotation speed of 970-1000r / min and stir for 4-6min, then add particle size 1-0.1mm of dense corundum, particle size 200-250mesh of dense corundum, graphite, graphene oxide, metallic silicon powder, lanthanum oxide, zirconium carbide and thermosetting phenolic resin and stir for 10-15min to obtain mixed mud;

[0048] 3) The mixed mud is pressed into a brick by a press, the pressure of the press is 850t, the volume density of the obtained brick is 2.69g / cm 3 , the obtained brick is baked and solidified at 210℃ for 21h, taken out after natural cooling to room temperature, and low-carbon aluminum silicon carbide bricks for ladle are obtained.

[0049] Example 3

[0050] The low-carbon aluminum silicon carbide bricks for ladle in this example include the following raw materials in mass fraction:

[0051] 12 parts of dense corundum with particle size of 5-3mm, 13 parts of dense corundum with particle size of 3-1mm, 13 parts of dense corundum with particle size of 1-0.1mm, 12 parts of dense corundum with particle size of 200-250 mesh, 3 parts of kyanite with particle size of 3-1mm, 4 parts of kyanite with particle size of 1-0.1mm, 7 parts of kyanite with particle size of 200-250 mesh, 8 parts of silicon carbide, 3 parts of graphite, 5 parts of graphene oxide, 2 parts of silicon powder, 2 parts of lanthanum oxide, 4 parts of zirconium carbide, and 6 parts of thermosetting phenolic resin.

[0052] The preparation method of the low-carbon aluminum silicon carbide bricks for ladle in this example includes the following steps:

[0053] 1) The dense corundum of each particle size, the kyanite of each particle size, the silicon carbide, the graphite, the graphene oxide, and the thermosetting phenolic resin are preheated to 40-50℃ respectively;

[0054] 2) The dense corundum with particle size of 5-3mm, the dense corundum with particle size of 3-1mm, the kyanite of each particle size, and the silicon carbide are added into a mixer with rotating speed of 970-1000r / min and stirred for 4-6min, then the dense corundum with particle size of 1-0.1mm, the dense corundum with particle size of 200-250 mesh, the graphite, the graphene oxide, the silicon powder, the lanthanum oxide, the zirconium carbide, and the thermosetting phenolic resin are added and stirred for 10-15min, and a mixed mud is obtained;

[0055] 3) The mixed mud is pressed into a brick by a press, the pressure of the press is 950t, the volume density of the obtained brick is 2.75g / cm 3 , the obtained brick is baked and solidified at 210℃ for 22h, taken out after natural cooling to room temperature, and low-carbon aluminum silicon carbide bricks for ladle are obtained.

[0056] Example 4

[0057] The low-carbon aluminum silicon carbide bricks for ladle in this example include the following raw materials in mass fraction:

[0058] Dense corundum 10 parts with particle size of 5-3 mm, dense corundum 10 parts with particle size of 3-1 mm, dense corundum 15 parts with particle size of 1-0.1 mm, dense corundum 15 parts with particle size of 200-250 mesh, kyanite 4 parts with particle size of 3-1 mm, kyanite 3 parts with particle size of 1-0.1 mm, kyanite 8 parts with particle size of 200-250 mesh, silicon carbide 9 parts, graphite 5 parts, graphene oxide 3 parts, metal silicon powder 0.5 parts, lanthanum oxide 1 part, zirconium carbide 2 parts, and thermosetting phenolic resin 5 parts.

[0059] The preparation method of the low-carbon aluminum silicon carbide brick for the ladle in this embodiment comprises the following steps:

[0060] 1) Preheat the dense corundum of each particle size, the kyanite of each particle size, the silicon carbide, the graphite, the graphene oxide, and the thermosetting phenolic resin to 40-50℃ respectively;

[0061] 2) Put the dense corundum with particle size of 5-3 mm, the dense corundum with particle size of 3-1 mm, the kyanite of each particle size, and the silicon carbide into a mixer with a rotating speed of 970-1000 r / min and stir for 4-6 min, then add the dense corundum with particle size of 1-0.1 mm, the dense corundum with particle size of 200-250 mesh, the graphite, the graphene oxide, the metal silicon powder, the lanthanum oxide, the zirconium carbide, and the thermosetting phenolic resin and stir for 10-15 min to obtain a mixed mud;

[0062] 3) Press the mixed mud into a brick blank by using a press machine, the pressure of the press machine is 800 t, the bulk density of the obtained brick blank is 2.66 g / cm 3 , and the obtained brick blank is baked and solidified at 200℃ for 18 h, taken out after natural cooling to room temperature, to obtain the low-carbon aluminum silicon carbide brick for the ladle.

[0063] Example 5

[0064] The low-carbon aluminum silicon carbide brick for the ladle in this embodiment comprises the following raw materials by mass fraction:

[0065] Dense corundum 14 parts with particle size of 5-3 mm, dense corundum 12 parts with particle size of 3-1 mm, dense corundum 12 parts with particle size of 1-0.1 mm, dense corundum 14 parts with particle size of 200-250 mesh, kyanite 6 parts with particle size of 3-1 mm, kyanite 6 parts with particle size of 1-0.1 mm, kyanite 7 parts with particle size of 200-250 mesh, silicon carbide 7 parts, graphite 3 parts, graphene oxide 4 parts, metal silicon powder 1 part, lanthanum oxide 2 parts, zirconium carbide 2 parts, and thermosetting phenolic resin 6 parts.

[0066] The preparation method of the low-carbon aluminum silicon carbide brick for the ladle in this embodiment comprises the following steps:

[0067] 1) Preheat each size of dense corundum, each size of kyanite, silicon carbide, graphite, graphene oxide and thermosetting phenolic resin to 40-50℃ respectively;

[0068] 2) Add the dense corundum with a particle size of 5-3mm, the dense corundum with a particle size of 3-1mm, each size of kyanite and silicon carbide into a mixer with a rotating speed of 970-1000r / min and stir for 4-6min, then add the dense corundum with a particle size of 1-0.1mm, the dense corundum with a particle size of 200-250 mesh, graphite, graphene oxide, metallic silicon powder, lanthanum oxide, zirconium carbide and thermosetting phenolic resin and stir for 10-15min to obtain a mixed mud;

[0069] 3) Press the mixed mud into a brick blank by using a press machine, the pressure of the press machine is 900t, the bulk density of the obtained brick blank is 2.72g / cm 3 , the obtained brick blank is baked and solidified at 190℃ for 24h, and is taken out after natural cooling to room temperature to obtain a low-carbon aluminum silicon carbide brick for a ladle.

[0070] Example 6

[0071] The low-carbon aluminum silicon carbide brick for a ladle in this example comprises the following raw materials in mass fraction:

[0072] The dense corundum with a particle size of 5-3mm is 11 parts, the dense corundum with a particle size of 3-1mm is 11 parts, the dense corundum with a particle size of 1-0.1mm is 11 parts, the dense corundum with a particle size of 200-250 mesh is 12 parts, the kyanite with a particle size of 3-1mm is 5 parts, the kyanite with a particle size of 1-0.1mm is 5 parts, the kyanite with a particle size of 200-250 mesh is 4 parts, the silicon carbide is 13 parts, the graphite is 6 parts, the graphene oxide is 3 parts, the metallic silicon powder is 2 parts, the lanthanum oxide is 1 part, the zirconium carbide is 3 parts, and the thermosetting phenolic resin is 4 parts.

[0073] The preparation method of the low-carbon aluminum silicon carbide brick for a ladle in this example comprises the following steps:

[0074] 1) Preheat each size of dense corundum, each size of kyanite, silicon carbide, graphite, graphene oxide and thermosetting phenolic resin to 40-50℃ respectively;

[0075] 2) Add the dense corundum with a particle size of 5-3mm, the dense corundum with a particle size of 3-1mm, each size of kyanite and silicon carbide into a mixer with a rotating speed of 970-1000r / min and stir for 4-6min, then add the dense corundum with a particle size of 1-0.1mm, the dense corundum with a particle size of 200-250 mesh, graphite, graphene oxide, metallic silicon powder, lanthanum oxide, zirconium carbide and thermosetting phenolic resin and stir for 10-15min to obtain a mixed mud;

[0076] 3) The mixed slurry is pressed into a brick by a press with a pressure of 800 t, and the volume density of the obtained brick is 2.65 g / cm 3 The obtained brick is baked and cured at 180 ℃ for 20 h, taken out after natural cooling to room temperature, and a low-carbon aluminum silicon carbide brick for a ladle is obtained.

[0077] Comparative Example 1

[0078] The low-carbon aluminum silicon carbide brick in the present comparative example comprises the following raw materials in mass fraction:

[0079] 10 parts of bauxite with a particle size of 5-3 mm, 8 parts of bauxite with a particle size of 3-1 mm, 8 parts of bauxite with a particle size of 1-0.1 mm, 6 parts of bauxite with a particle size of 200-250 mesh, 5 parts of andalusite with a particle size of 3-1 mm, 5 parts of andalusite with a particle size of 1-0.1 mm, 7 parts of graphite with a particle size of 180 mesh, 10 parts of silicon carbide with a particle size of 200-250 mesh, 2 parts of metallic iron powder with a particle size of 200-250 mesh, and 3 parts of thermosetting phenolic resin.

[0080] The preparation method of the low-carbon aluminum silicon carbide brick in the present comparative example comprises the following steps:

[0081] 1) The bauxite, andalusite, graphite, silicon carbide, metallic iron powder and thermosetting phenolic resin of each particle size are added into a mixer with a rotating speed of 970-1000 r / min, mixed and stirred for 20 min to obtain a mixed slurry;

[0082] 2) The mixed slurry is pressed into a brick by a press with a pressure of 900 t, and the volume density of the obtained brick is 2.64 g / cm 3 The obtained brick is baked and cured at 200 ℃ for 16 h, taken out after natural cooling to room temperature, and a low-carbon aluminum silicon carbide brick is obtained.

[0083] The properties of the low-carbon aluminum silicon carbide bricks prepared in each example and comparative example are tested; wherein the apparent porosity, volume density, cold crushing strength and 0.2 MPa load softening starting temperature are detected according to GB / T 2997-2015, GB / T 5072-2023 and GB / T 5989-2023; the process of thermal shock stability test is as follows: the low-carbon aluminum silicon carbide brick is made into a sample with a size of 40 mm×40 mm×160 mm, heated to 1100 ℃ and kept for 30 min, then taken out and quickly put into cold water, and the above process is repeated until the sample is broken, and the number of repetitions is recorded to evaluate the thermal shock stability of the sample. The results are shown in Table 1.

[0084] Table 1

[0085]

[0086] As can be seen from table 1, the low-carbon aluminum silicon carbide brick provided by the application adopts dense corundum and kyanite with a specific particle size distribution, selects graphite and graphene oxide as carbon sources, selects three additives of silicon powder, lanthanum oxide and zirconium carbide, and finally adopts a specific preparation method, so that the low-carbon aluminum silicon carbide brick produced has a low porosity. The low-carbon aluminum silicon carbide brick provided by the application has excellent corrosion resistance, slag resistance and good thermal shock stability when used as the lining of a ladle, has a long service life, is energy-saving and environment-friendly. The preparation method of the application has raw materials that are easy to obtain, simple process steps, and does not have high requirements on production equipment, and is suitable for mass production.

[0087] The above examples are merely illustrative for the sake of clarity and are in no way intended to limit the scope of the embodiments. Other variations and modifications can be made to the embodiments described above based on the principles described above, and it is to be understood that such variations and modifications are intended to fall within the scope of the present application.

Claims

1. A low-carbon aluminum silicon carbide brick for a ladle characterized by, The raw materials include the following mass fractions: dense corundum 40-60 parts, kyanite 10-20 parts, silicon carbide 5-15 parts, graphite 3-6 parts, graphene oxide 3-6 parts, metal silicon powder 0.5-2 parts, lanthanum oxide 0.5-2 parts, zirconium carbide 1-4 parts, and phenolic resin 4-7 parts.

2. The low-carbon aluminum silicon carbide brick for a ladle according to claim 1, characterized by, The dense corundum includes the following mass fractions of dense corundum of different particle sizes: 10-15 parts of dense corundum with a particle size of 5-3 mm, 10-15 parts of dense corundum with a particle size of 3-1 mm, 10-15 parts of dense corundum with a particle size of 1-0.1 mm, and 10-15 parts of dense corundum with a particle size of 200-250 mesh.

3. The low-carbon aluminum silicon carbide brick for a ladle according to claim 1, characterized by, The kyanite includes the following mass fractions of kyanite of different particle sizes: 3-6 parts of kyanite with a particle size of 3-1 mm, 3-6 parts of kyanite with a particle size of 1-0.1 mm, and 4-8 parts of kyanite with a particle size of 200-250 mesh.

4. The low-carbon aluminum silicon carbide brick for a ladle according to claim 1, characterized by The Al2O3 content in the dense corundum is ≥97wt%; and the sum of the Al2O3 and SiO2 contents in the kyanite is ≥98wt%.

5. The low-carbon aluminum silicon carbide brick for a ladle according to claim 1, characterized by The SiC content in the silicon carbide is ≥98wt%, and the particle size is 100-120 mesh; the particle size of the graphite is 180-200 mesh; and the particle size of the graphene oxide is 180-200 mesh.

6. The low-carbon aluminum silicon carbide brick for a ladle according to claim 1, characterized by The particle size of the metal silicon powder is 180-200 mesh; the particle size of the lanthanum oxide is 260-300 mesh; and the particle size of the zirconium carbide is 80-100 mesh.

7. The low-carbon aluminum silicon carbide brick for a ladle according to claim 1, characterized by The low-carbon aluminum silicon carbide brick has an apparent porosity of 8.1-8.5%, a bulk density of 2.84-2.90 g / cm 3 , a cold compressive strength of 54.6-58.9 MPa, a 0.2 MPa load softening starting temperature of 1475-1490 DEG C, and a 1100 DEG C water cooling thermal shock resistance of 6-8 times.

8. A method of producing a low-carbon aluminum silicon carbide brick for a ladle as claimed in any one of claims 1 to 7, characterized by, The method includes the following steps: 1) Preheat the dense corundum of each particle size, the kyanite of each particle size, the silicon carbide, the graphite, the graphene oxide, and the phenolic resin to 40-50℃ respectively; 2) Add the dense corundum with a particle size of 5-3 mm, the dense corundum with a particle size of 3-1 mm, the kyanite of each particle size, and the silicon carbide into a mixing machine for primary stirring, then add the dense corundum with a particle size of 1-0.1 mm, the dense corundum with a particle size of 200-250 mesh, the graphite, the graphene oxide, the metal silicon powder, the lanthanum oxide, the zirconium carbide, and the phenolic resin for secondary stirring to obtain a mixing slurry; 3) Press the mixing slurry into a green brick, then bake and solidify to obtain the low-carbon aluminum silicon carbide brick for a ladle.

9. The method of producing low-carbon aluminum silicon carbide brick for a ladle according to claim 8, characterized by, The stirring rate of the mixing machine is 970-1000r / min, the primary stirring time is 4-6min, and the secondary stirring time is 10-15min.

10. The method of producing low-carbon aluminum silicon carbide brick for a ladle according to claim 8, characterized by, The volume density of the green brick is 2.65-2.75 g / cm 3 The temperature of the baking and curing is 200-240℃, and the time is 18-24h.

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