CN115536408A - Silicon carbide self-flow castable for blast furnace lining and pouring construction method thereof - Google Patents

Silicon carbide self-flow castable for blast furnace lining and pouring construction method thereof Download PDF

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CN115536408A
CN115536408A CN202211230250.5A CN202211230250A CN115536408A CN 115536408 A CN115536408 A CN 115536408A CN 202211230250 A CN202211230250 A CN 202211230250A CN 115536408 A CN115536408 A CN 115536408A
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parts
castable
silicon carbide
blast furnace
furnace
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CN115536408B (en
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张晟
裴一新
夏军东
黄伟
陈占军
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Yixing Xingbei Refractories Products Co ltd
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Yixing Xingbei Refractories Products Co ltd
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
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Abstract

The invention discloses a silicon carbide self-flowing castable for a blast furnace lining and a pouring construction method thereof, belonging to the technical field of castable preparation, wherein the silicon carbide self-flowing castable for the blast furnace lining comprises the following components in parts by weight: 24-52 parts of aggregate, 14-25 parts of composite powder, 3.5-8 parts of composite fiber, 3.4-8.9 parts of additive and 5-7 parts of water, wherein the construction method comprises the following steps: s1, preparing a casting material; s2, pouring at the bottom of the furnace; s3, pouring the inner wall of the furnace; the castable disclosed by the invention is good in fluidity, convenient for construction of a blast furnace lining, good in cohesiveness with a furnace shell, not easy to fall off, good in fire resistance, simple and convenient in construction method and high in construction efficiency.

Description

Silicon carbide self-flow castable for blast furnace lining and pouring construction method thereof
Technical Field
The invention relates to the technical field of preparation of castable, in particular to silicon carbide self-flow castable for a blast furnace lining and a pouring construction method thereof.
Background
The castable is also called refractory castable, is a granular or powdery material prepared by adding a certain amount of bonding agent into refractory materials, has higher fluidity and is an unshaped refractory material molded by a pouring mode.
Compared with other unshaped refractory materials, the castable has higher content of the bonding agent and water and better fluidity, so the application range of the castable is wider, and the used material and the bonding agent can be selected according to the use conditions. It can be directly cast into lining body, or cast or vibrated into prefabricated block.
The refractory castable is a mixture consisting of refractory aggregate, a binding agent and an additive, and is mixed with water (or a liquid binding agent) to form pug which can be constructed by a casting method. The refractory castable is different from other unshaped refractory materials in that the refractory castable has certain setting and hardening time after construction, so that the castable can be demoulded after certain time of curing after casting molding and can be put into baking for use after proper time of natural curing.
The performance of the existing castable in the blast furnace lining mainly has the following problems that hollow cargo pores exist in the blast furnace casting due to poor fluidity of the castable, the service life of the blast furnace lining is influenced, the strength is not high enough, the gravity of the upper-layer castable needs to be borne after the bottom-layer castable is hardened, and the castable is not high enough and is easy to crack and fall off.
Disclosure of Invention
In order to solve the technical problems, the invention provides a silicon carbide self-flow castable for a blast furnace lining and a pouring construction method thereof.
The technical scheme of the invention is as follows: the silicon carbide self-flow castable for the blast furnace lining is characterized by comprising the following components in parts by weight: 24-52 parts of aggregate, 14-25 parts of composite powder, 3.5-8 parts of composite fiber, 3.4-8.9 parts of additive and 5-7 parts of water;
the aggregate comprises the following components in parts by weight: 5-8 parts of crystalline flake graphite, 8-20 parts of silicon carbide, 3-5 parts of titanium-iron alloy slag, 3-7 parts of vitrified micro-beads and 5-12 parts of black carborundum;
the composite powder comprises the following components in parts by weight: 3-5 parts of metal silicon powder, 4-8 parts of RETaO4 ceramic powder, 3-5 parts of corundum powder and 4-7 parts of titanium dioxide;
the composite fiber comprises the following components in parts by weight: 0.5-2 parts of basalt fiber, 2-5 parts of magnesium borate whisker and 1-3 parts of ceramic fiber cotton;
the additive comprises the following components in parts by weight: 0.4-1.3 parts of silica sol, 0.8-1.5 parts of composite explosion-proof agent, 1-3 parts of adhesive, 0.7-1.8 parts of FDN type naphthalene water reducing agent and 0.5-1.3 parts of curing agent, and the fluidity and the caking property of the castable are improved through various additives, so that the strength of the castable is improved.
Further, the explosion-proof agent is prepared by mixing azodicarbonamide and basic aluminum lactate according to the mass ratio of 1.
Furthermore, the adhesive is prepared by mixing magnesium silicate and sodium silicate according to the mass ratio of 2.
Further, the curing agent comprises the following components in percentage by mass: 20-35% of aluminate cement, 10-15% of calcium aluminate nanowhiskers and the balance of portland cement, wherein the portland cement can harden the castable, and the calcium aluminate nanowhiskers can improve the strength of the castable after hardening and prevent the castable from cracking.
Furthermore, the granularity of the crystalline flake graphite in the aggregate is 1-2mm, the granularity of the silicon carbide comprises 40-60 μm and 80-100 μm, wherein the silicon carbide with the granularity of 40-60 μm accounts for 60-70% of the total mass of the silicon carbide, the silicon carbide with the granularity of 80-100 μm accounts for 30-40% of the total mass of the silicon carbide, the granularity of the titanium-iron alloy slag is 0.8-1.5mm, the granularity of the vitrified micro-beads is 0.5-0.8mm, and the granularity of the black carborundum is 0.7-1.2mm, and the granularity can reduce the surface roughness after the castable is hardened and reduce the friction force between the material and the inner wall of the blast furnace.
Further, the method can be used for preparing a novel liquid crystal displayThe Si content of the metal silicon powder in the composite powder is more than or equal to 98 percent, the granularity is 15-20 mu m, the granularity of the RETaO4 ceramic powder is 5-15 mu m, and the alpha-Al content of the corundum powder is higher than or equal to 98 percent 2 O 3 The content is more than or equal to 90 percent, the granularity is 13-20 mu m, the granularity of the titanium dioxide is 1-5 mu m, and the fire resistance strength of the refractory castable is improved.
Furthermore, the length of basalt fiber in the composite fiber is 1.5-3m, the length of magnesium borate whisker is 3-5mm, the length of ceramic fiber cotton is 5-8mm, the composite fiber further enhances the strength of the refractory castable, the refractory castable is prevented from cracking, and the service life of the refractory castable for the inner wall of the blast furnace is prolonged.
Further, the pouring construction method of the silicon carbide self-flow castable for the blast furnace lining comprises the following steps:
s1, preparing a casting material:
placing the aggregate, the composite powder and the composite fiber into a mixer according to the weight parts, uniformly mixing to obtain a mixture, mixing and stirring the additive and water to obtain a mixed solution, and mixing the mixed solution and the mixture again to obtain a casting material;
s2, pouring at the bottom of the furnace:
paving the furnace bottom by using a shaped refractory material to form a refractory paving layer, wherein the paving thickness is 5-10cm, pumping the casting material obtained in the step S1 into the surface of the paving layer, manually leveling the uneven part after the casting material is automatically leveled, and maintaining for 24 hours at the temperature of 20-40 ℃ after the casting material is completely leveled;
s3, pouring the inner wall of the furnace:
firstly, building a mould on the inner wall of the blast furnace layer by layer, wherein the thickness between the mould and a furnace shell is 15-20cm, immersing the surface of a refractory brick into a castable, then laying a layer of refractory brick close to the furnace shell, wherein the laying thickness is 8-10cm, after laying is finished, guiding the castable into a gap between a template and the refractory brick, the top of the guided castable is 1-2cm higher than the top of the refractory brick, laying a layer of refractory brick again, and repeating the steps until the whole inner wall of the blast furnace is cast;
further, the mixing temperature of the mixed solution and the mixture in the step S1 is 80-90 ℃, the prepared castable needs to be poured on a surface to be constructed within 1-2 hours after mixing, the castable has the best fluidity in a short time, and pores generated inside the castable can be avoided, so that the service life of the castable is further influenced.
Furthermore, in the step S3, the construction sequence of the inner wall of the blast furnace sequentially comprises a hearth, a furnace belly, a furnace waist, a furnace body and a furnace throat from bottom to top, maintenance is required for 8-10 hours after the construction of each part is completed, then the construction of the next part is carried out, and in the maintenance process, the hardening of the bottom castable is waited, so that the upper-layer castable can be supported.
The invention has the beneficial effects that:
compared with the existing refractory castable, the refractory castable disclosed by the invention has higher compressive strength, so that when the refractory castable is used in the inner wall of a blast furnace, the castable at the bottom layer has a supporting effect on the castable at the upper layer, and the castable at the bottom layer can not crack.
Drawings
FIG. 1 is a construction flow chart of the castable of the invention.
Detailed Description
Example 1:
as shown in fig. 1, the silicon carbide self-flow castable for the blast furnace lining is characterized by comprising the following components in parts by weight: 24 parts of aggregate, 14 parts of composite powder, 3.5 parts of composite fiber, 3.4 parts of additive and 5 parts of water;
the aggregate comprises the following components in parts by weight: 5 parts of crystalline flake graphite, 8 parts of silicon carbide, 3 parts of ferrotitanium slag, 3 parts of vitrified micro bubbles and 5 parts of black carborundum;
the composite powder comprises the following components in parts by weight: 3 parts of metal silicon powder, 4 parts of RETaO4 ceramic powder, 3 parts of corundum powder and 4 parts of titanium dioxide;
the composite fiber comprises the following components in parts by weight: 0.5 part of basalt fiber, 2 parts of magnesium borate whisker and 1 part of ceramic fiber cotton;
the additive comprises the following components in parts by weight: 0.4 part of silica sol, 0.8 part of composite explosion-proof agent, 1 part of adhesive, 0.7 part of FDN naphthalene water reducer and 0.5 part of curing agent, and the fluidity and the caking property of the castable are improved through various additives, so that the strength of the castable is improved.
The explosion-proof agent is prepared by mixing azodicarbonamide and basic aluminum lactate according to the mass ratio of 1.
The adhesive is prepared by mixing magnesium silicate and sodium silicate according to the mass ratio of 2 to 1, wherein the granularity of the magnesium silicate is 20-60 mu m, and the granularity of the sodium silicate is 15-40 mu m, and the adhesive has good adhesive effect.
The curing agent comprises the following components in percentage by mass: 20% of aluminate cement, 10% of calcium aluminate nanowhiskers and the balance of portland cement, wherein the portland cement can harden the castable, and the calcium aluminate nanowhiskers can improve the strength of the hardened castable and avoid cracking of the castable.
The granularity of the crystalline flake graphite in the aggregate is 1-2mm, the granularity of the silicon carbide comprises 40-60 μm and 80-100 μm, wherein the silicon carbide with the granularity of 40-60 μm accounts for 60% of the total mass of the silicon carbide, the silicon carbide with the granularity of 80-100 μm accounts for 40% of the total mass of the silicon carbide, the granularity of the titanium-iron alloy slag is 0.8-1.5mm, the granularity of the vitrified micro-beads is 0.5-0.8mm, and the granularity of the black carborundum is 0.7-1.2mm, and the granularity can reduce the surface roughness of the hardened castable and reduce the friction force between the material and the inner wall of the blast furnace.
The Si content of the metal silicon powder in the composite powder is 98 percent, the granularity is 15-20 mu m, the granularity of the RETaO4 ceramic powder is 5-15 mu m, and the alpha-Al content of the corundum powder 2 O 3 The content is 90%, the granularity is 13-20 mu m, the granularity of titanium dioxide is 1-5 mu m, and the fire resistance strength of the refractory castable is improved.
The length of basalt fiber in the composite fiber is 1.5-3m, the length of magnesium borate whisker is 3-5mm, the length of ceramic fiber cotton is 5-8mm, the composite fiber further enhances the strength of the refractory castable, the refractory castable is prevented from cracking, and the service life of the refractory castable on the inner wall of the blast furnace is prolonged.
The pouring construction method of the silicon carbide self-flow castable for the blast furnace lining comprises the following steps:
s1, preparing a casting material:
placing the aggregate, the composite powder and the composite fiber into a mixer according to the weight parts, uniformly mixing to obtain a mixture, mixing and stirring the additive and water to obtain a mixed solution, and mixing the mixed solution and the mixture again to obtain a casting material;
s2, furnace bottom pouring:
paving the furnace bottom by using a shaped refractory material to form a refractory paving layer, wherein the paving thickness is 5cm, pumping the casting material obtained in the step S1 into the surface of the paving layer, manually leveling the uneven part after the casting material automatically flows and levels, and maintaining for 24 hours at 20 ℃;
s3, pouring the inner wall of the furnace:
firstly, building a mould on the inner wall of a blast furnace in a layered manner, wherein the thickness between the mould and a furnace shell is 15-20cm, immersing the surface of a refractory brick into a castable, then laying a layer of refractory brick close to the furnace shell, wherein the laying thickness is 8-10cm, after laying is finished, guiding the castable into a gap between a template and the refractory brick, leading the top of the castable to be 1cm higher than the top of the refractory brick, laying a layer of refractory brick again, and repeating the steps until the whole inner wall of the blast furnace is cast;
in the step S1, the mixing temperature of the mixed solution and the mixture is 80 ℃, the prepared castable needs to be poured on a surface to be constructed within 1h after mixing is finished, the castable has the best fluidity in a short time, and pores can be prevented from being generated in the castable, so that the service life of the castable is further influenced.
And S3, the construction sequence of the inner wall of the blast furnace sequentially comprises a furnace hearth, a furnace belly, a furnace waist, a furnace body and a furnace throat from bottom to top, maintenance is needed for 8 hours after each part of construction is completed, then the next part of construction is carried out, and in the maintenance process, the bottom castable is waited to be hardened, so that the upper-layer pouring can be supported.
Example 2:
the silicon carbide self-flow castable for the blast furnace lining is characterized by comprising the following components in parts by weight: 36 parts of aggregate, 19 parts of composite powder, 6.5 parts of composite fiber, 6.4 parts of additive and 5-7 parts of water;
the aggregate comprises the following components in parts by weight: 6 parts of crystalline flake graphite, 11 parts of silicon carbide, 4 parts of ferrotitanium slag, 5 parts of vitrified micro-beads and 10 parts of black carborundum;
the composite powder comprises the following components in parts by weight: 4 parts of metal silicon powder, 5 parts of RETaO4 ceramic powder, 4 parts of corundum powder and 6 parts of titanium dioxide;
the composite fiber comprises the following components in parts by weight: 1.5 parts of basalt fibers, 3 parts of magnesium borate whiskers and 2 parts of ceramic fiber cotton;
the additive comprises the following components in parts by weight: 1 part of silica sol, 1.2 parts of composite explosion-proof agent, 2 parts of adhesive, 1.2 parts of FDN naphthalene water reducing agent and 1 part of curing agent, and improves the fluidity and the caking property of the castable and the strength of the castable through various additives.
The explosion-proof agent is prepared by mixing azodicarbonamide and basic aluminum lactate according to the mass ratio of 1.
The adhesive is prepared by mixing magnesium silicate and sodium silicate according to the mass ratio of 2 to 1, wherein the granularity of the magnesium silicate is 20-60 mu m, and the granularity of the sodium silicate is 15-40 mu m, and the adhesive has good adhesive effect.
The curing agent comprises the following components in percentage by mass: 30% of aluminate cement, 13% of calcium aluminate nanowhiskers and the balance of portland cement, wherein the portland cement can harden the castable, and the calcium aluminate nanowhiskers can improve the strength of the hardened castable and avoid cracking of the castable.
The granularity of the crystalline flake graphite in the aggregate is 1-2mm, the granularity of the silicon carbide comprises 40-60 μm and 80-100 μm, wherein the silicon carbide with the granularity of 40-60 μm accounts for 65% of the total mass of the silicon carbide, the silicon carbide with the granularity of 80-100 μm accounts for 35% of the total mass of the silicon carbide, the granularity of the titanium-iron alloy slag is 0.8-1.5mm, the granularity of the vitrified micro-beads is 0.5-0.8mm, and the granularity of the black carborundum is 0.7-1.2mm, and the granularity can reduce the surface roughness of the hardened castable and reduce the friction force between the material and the inner wall of the blast furnace.
The Si content of the metallic silicon powder in the composite powder is 98.5 percent, the granularity is 15-20 mu m, the granularity of the RETaO4 ceramic powder is 5-15 mu m, and the alpha-Al content of the corundum powder 2 O 3 The content is 93 percent, the granularity is 13-20 mu m, the granularity of titanium dioxide is 1-5 mu m, and the fire resistance strength of the refractory castable is improved.
The length of basalt fiber in the composite fiber is 1.5-3m, the length of magnesium borate whisker is 3-5mm, the length of ceramic fiber cotton is 5-8mm, the composite fiber further enhances the strength of the refractory castable, the refractory castable is prevented from cracking, and the service life of the refractory castable on the inner wall of the blast furnace is prolonged.
The pouring construction method of the silicon carbide self-flow castable for the blast furnace lining comprises the following steps:
s1, preparing a castable:
placing the aggregate, the composite powder and the composite fiber into a mixer according to the weight parts, uniformly mixing to obtain a mixture, mixing and stirring the additive and water to obtain a mixed solution, and mixing the mixed solution and the mixture again to obtain a casting material;
s2, pouring at the bottom of the furnace:
paving the furnace bottom by using a shaped refractory material to form a refractory paving layer, wherein the paving thickness is 8cm, pumping the casting material obtained in the step S1 into the surface of the paving layer, manually leveling the uneven part after the casting material automatically flows and levels, and maintaining for 24 hours at 30 ℃;
s3, pouring the inner wall of the furnace:
firstly, building a mould on the inner wall of the blast furnace layer by layer, wherein the thickness between the mould and the furnace shell is 18cm, immersing the surface of a refractory brick into a castable, then laying a layer of refractory brick close to the furnace shell, wherein the laying thickness is 9cm, after laying is finished, guiding the castable into a gap between a template and the refractory brick, the top of the castable is higher than the top of the refractory brick by 1.5cm, laying a layer of refractory brick again, and repeating the steps until the whole inner wall of the blast furnace is cast;
the mixing temperature of the mixed solution and the mixture in the step S1 is 85 ℃, the prepared castable needs to be poured on a surface to be constructed within 1.5h after mixing, the castable has the best fluidity in a short time, and pores generated inside the castable can be avoided, so that the service life of the castable is further influenced.
And S3, the construction sequence of the inner wall of the blast furnace sequentially comprises a hearth, a furnace belly, a furnace waist, a furnace body and a furnace throat from bottom to top, maintenance is needed for 9 hours after each part of construction is finished, then the next part of construction is carried out, and in the maintenance process, the bottom castable is waited to harden, so that the upper-layer castable can be supported.
Example 3:
the silicon carbide self-flow castable for the blast furnace lining is characterized by comprising the following components in parts by weight: 52 parts of aggregate, 25 parts of composite powder, 8 parts of composite fiber, 8.9 parts of additive and 7 parts of water;
the aggregate comprises the following components in parts by weight: 8 parts of crystalline flake graphite, 20 parts of silicon carbide, 5 parts of ferrotitanium slag, 7 parts of vitrified micro bubbles and 12 parts of black carborundum;
the composite powder comprises the following components in parts by weight: 5 parts of metal silicon powder, 8 parts of RETaO4 ceramic powder, 5 parts of corundum powder and 7 parts of titanium dioxide;
the composite fiber comprises the following components in parts by weight: 2 parts of basalt fiber, 5 parts of magnesium borate whisker and 3 parts of ceramic fiber cotton;
the additive comprises the following components in parts by weight: 1.3 parts of silica sol, 1.5 parts of composite explosion-proof agent, 3 parts of adhesive, 1.8 parts of FDN naphthalene water reducer and 1.3 parts of curing agent, and the fluidity and the caking property of the castable are improved through various additives, so that the strength of the castable is improved.
The explosion-proof agent is prepared by mixing azodicarbonamide and basic aluminum lactate according to a mass ratio of 1.
The adhesive is prepared by mixing magnesium silicate and sodium silicate according to the mass ratio of 2 to 1, wherein the granularity of the magnesium silicate is 20-60 mu m, and the granularity of the sodium silicate is 15-40 mu m, and the adhesive has good adhesive effect.
The curing agent comprises the following components in percentage by mass: 35% of aluminate cement, 15% of calcium aluminate nanowhiskers and the balance of portland cement, wherein the portland cement can harden the castable, and the calcium aluminate nanowhiskers can improve the strength of the hardened castable and avoid cracking of the castable.
The granularity of the crystalline flake graphite in the aggregate is 1-2mm, the granularity of the silicon carbide comprises 40-60 μm and 80-100 μm, wherein the silicon carbide with the granularity of 40-60 μm accounts for 60% of the total mass of the silicon carbide, the silicon carbide with the granularity of 80-100 μm accounts for 40% of the total mass of the silicon carbide, the granularity of the titanium-iron alloy slag is 0.8-1.5mm, the granularity of the vitrified micro-beads is 0.5-0.8mm, and the granularity of the black carborundum is 0.7-1.2mm, and the granularity can reduce the surface roughness of the hardened castable and reduce the friction force between the material and the inner wall of the blast furnace.
The Si content of the metallic silicon powder in the composite powder is 99 percent, the granularity is 15 to 20 mu m, the granularity of the RETaO4 ceramic powder is 5 to 15 mu m, and the alpha-Al content of the corundum powder 2 O 3 The content is 97 percent, the granularity is 13-20 mu m, the granularity of titanium dioxide is 1-5 mu m, and the fire resistance intensity of the refractory castable is improved.
The length of basalt fiber in the composite fiber is 1.5-3m, the length of magnesium borate whisker is 3-5mm, the length of ceramic fiber cotton is 5-8mm, the composite fiber further enhances the strength of the refractory castable, the refractory castable is prevented from cracking, and the service life of the refractory castable on the inner wall of the blast furnace is prolonged.
The pouring construction method of the silicon carbide self-flow castable for the blast furnace lining comprises the following steps:
s1, preparing a casting material:
placing the aggregate, the composite powder and the composite fiber into a mixer according to the weight parts, uniformly mixing to obtain a mixture, mixing and stirring the additive and water to obtain a mixed solution, and mixing the mixed solution and the mixture again to obtain a casting material;
s2, pouring at the bottom of the furnace:
paving the furnace bottom by adopting a shaped refractory material to form a refractory paving layer, wherein the paving thickness is 10cm, pumping the casting material obtained in the step S1 into the surface of the paving layer, manually leveling an uneven place after the casting material is automatically leveled, and maintaining for 24 hours at 40 ℃;
s3, pouring the inner wall of the furnace:
firstly, building a mould on the inner wall of the blast furnace layer by layer, wherein the thickness between the mould and the furnace shell is 20cm, immersing the surface of a refractory brick into a castable, then laying a layer of refractory brick close to the furnace shell, the laying thickness is 10cm, after laying is finished, guiding the castable into a gap between a template and the refractory brick, the top of the guided castable is 2cm higher than the top of the refractory brick, laying a layer of refractory brick again, and repeating the steps until the whole inner wall of the blast furnace is cast;
the mixing temperature of the mixed solution and the mixture in the step S1 is 90 ℃, the prepared castable needs to be poured on a surface to be constructed within 2 hours after mixing is finished, the castable has the best fluidity in a short time, and pores generated inside the castable can be avoided, so that the service life of the castable is further influenced.
And S3, the construction sequence of the inner wall of the blast furnace sequentially comprises a hearth, a furnace belly, a furnace waist, a furnace body and a furnace throat from bottom to top, maintenance is needed for 10 hours after each part of construction is finished, then the next part of construction is carried out, and in the maintenance process, the bottom castable is waited to harden, so that the upper-layer castable can be supported.
Comparative examples 1 to 3, and example 3 the castable prepared in example 3 had the best fluidity and the strongest fire resistance during actual casting, and had the highest surface strength during use of the inner wall of the blast furnace, so example 3 was the best example.

Claims (10)

1. The silicon carbide self-flow castable for the blast furnace lining is characterized by comprising the following components in parts by weight: 24-52 parts of aggregate, 14-25 parts of composite powder, 3.5-8 parts of composite fiber, 3.4-8.9 parts of additive and 5-7 parts of water;
the aggregate comprises the following components in parts by weight: 5-8 parts of crystalline flake graphite, 8-20 parts of silicon carbide, 3-5 parts of titanium-iron alloy slag, 3-7 parts of vitrified micro-beads and 5-12 parts of black carborundum;
the composite powder comprises the following components in parts by weight: 3-5 parts of metal silicon powder, 4-8 parts of RETaO4 ceramic powder, 3-5 parts of corundum powder and 4-7 parts of titanium dioxide;
the composite fiber comprises the following components in parts by weight: 0.5-2 parts of basalt fiber, 2-5 parts of magnesium borate whisker and 1-3 parts of ceramic fiber cotton;
the additive comprises the following components in parts by weight: 0.4-1.3 parts of silica sol, 0.8-1.5 parts of composite explosion-proof agent, 1-3 parts of adhesive, 0.7-1.8 parts of FDN naphthalene water reducer and 0.5-1.3 parts of curing agent.
2. The silicon carbide self-flow castable for the blast furnace lining according to claim 1, wherein the anti-explosion agent is prepared by mixing azodicarbonamide and basic aluminum lactate according to a mass ratio of 1.
3. The silicon carbide self-flow castable for the blast furnace lining as claimed in claim 1, wherein the binder is prepared by mixing magnesium silicate and sodium silicate according to a mass ratio of 2.
4. The silicon carbide self-flow castable for the blast furnace lining according to claim 1, wherein the curing agent consists of the following components in percentage by mass: 20-35% of aluminate cement, 10-15% of calcium aluminate nanowhiskers and the balance of portland cement.
5. The silicon carbide self-flow castable for the blast furnace lining as claimed in claim 1, wherein the grain size of the crystalline flake graphite in the aggregate is 1-2mm, the grain size of the silicon carbide comprises 40-60 μm and 80-100 μm, wherein the silicon carbide with the grain size of 40-60 μm accounts for 60-70% of the total mass of the silicon carbide, the silicon carbide with the grain size of 80-100 μm accounts for 30-40% of the total mass of the silicon carbide, the grain size of the titanium-iron alloy slag is 0.8-1.5mm, the grain size of the vitrified micro bubbles is 0.5-0.8mm, and the grain size of the black carborundum is 0.7-1.2mm.
6. The silicon carbide self-flow castable for blast furnace lining according to claim 1, wherein the Si content of the metallic silicon powder in the composite powder is not less than 98%, the particle size is 15-20 μm, the particle size of the RETaO4 ceramic powder is 5-15 μm, and the α -Al of the corundum powder is 2 O 3 The content is more than or equal to 90 percent, the granularity is 13-20 mu m, and the granularity of the titanium dioxide is 1-5 mu m.
7. The silicon carbide self-flow castable for the blast furnace lining as claimed in claim 1, wherein the length of basalt fiber in the composite fiber is 1.5-3m, the length of magnesium borate whisker is 3-5mm, and the length of ceramic fiber cotton is 5-8mm.
8. The pouring construction method of the silicon carbide self-flow castable for the blast furnace lining according to claim 1, characterized by comprising the following steps:
s1, preparing a castable:
putting the aggregate, the composite powder and the composite fiber into a mixer according to the weight parts, uniformly mixing to obtain a mixture, mixing and stirring the additive and water to obtain a mixed solution, and mixing the mixed solution and the mixture again to obtain the castable;
s2, pouring at the bottom of the furnace:
paving the furnace bottom by using a shaped refractory material to form a refractory paving layer, wherein the paving thickness is 5-10cm, pumping the casting material obtained in the step S1 into the surface of the paving layer, manually leveling uneven places after the casting material is automatically leveled, and maintaining for 24 hours at 20-40 ℃;
s3, pouring the inner wall of the furnace:
firstly, building a mould on the inner wall of the blast furnace layer by layer, wherein the thickness between the mould and the furnace shell is 15-20cm, immersing the surface of a refractory brick into a castable, then laying a layer of refractory brick close to the furnace shell, wherein the laying thickness is 8-10cm, after laying is finished, guiding the castable into a gap between a template and the refractory brick, the top of the guided castable is 1-2cm higher than the top of the refractory brick, laying a layer of refractory brick again, and repeating the steps until the whole inner wall of the blast furnace is cast.
9. The casting construction method of the silicon carbide self-flowing castable for the blast furnace lining according to claim 8, wherein the mixing temperature of the mixed solution and the mixture in the step S1 is 80-90 ℃, and the prepared castable needs to be cast on a surface to be constructed within 1-2h after being mixed.
10. The casting method of the silicon carbide self-flow castable for blast furnace lining according to claim 8, wherein in step S3, the inner wall of the blast furnace is constructed in the sequence of the hearth, the furnace bosh, the furnace waist, the furnace body and the furnace throat from bottom to top, and after each part is constructed, the maintenance is required to be carried out for 8-10 hours, and then the next part is constructed.
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