CN115536408B - Silicon carbide self-flow castable for blast furnace lining and casting construction method thereof - Google Patents

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

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CN115536408B
CN115536408B CN202211230250.5A CN202211230250A CN115536408B CN 115536408 B CN115536408 B CN 115536408B CN 202211230250 A CN202211230250 A CN 202211230250A CN 115536408 B CN115536408 B CN 115536408B
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parts
castable
silicon carbide
blast furnace
powder
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CN115536408A (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
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D1/00—Casings; Linings; Walls; Roofs
    • F27D1/16—Making or repairing linings increasing the durability of linings or breaking away linings
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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
    • F27—FURNACES; KILNS; OVENS; RETORTS
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Abstract

The invention discloses a silicon carbide self-flow castable for a blast furnace lining and a pouring construction method thereof, belonging to the technical field of preparation of castable, wherein the silicon carbide self-flow 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 castable; s2, pouring at the bottom of the furnace; s3, pouring the inner wall of the furnace; the castable has good fluidity, is convenient for the construction of the blast furnace lining, has good cohesiveness with the furnace shell, is not easy to fall off, has good fire resistance, and has simple and convenient construction method and high construction efficiency.

Description

Silicon carbide self-flow castable for blast furnace lining and casting 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, also called refractory castable, is a granular and powdery material made by adding a certain amount of binding agent into refractory material, has higher fluidity and is shaped into unshaped refractory material in a casting mode.
Compared with other unshaped refractory materials, the binder and the water content are higher, and the fluidity is better, so that the castable has wider application range, and the materials and the binder can be selected according to the use conditions. The prefabricated block can be directly cast into a lining body for use, or can be manufactured into a prefabricated block by a casting or jolt-ramming method for use.
The refractory castable is a mixture composed of refractory aggregate, a binding agent and an additive, and water (or liquid binding agent) is added to blend the mixture into pug which can be constructed by a casting method. The difference with other unshaped refractory materials is that the refractory castable has a certain setting and hardening time after construction, so that the refractory castable can be demolded after a certain time of curing after casting molding, and then can be put into baking for use after a proper time of natural curing.
The existing castable is mainly problematic in that the fluidity of the castable is not good enough, so that hollow air holes exist in the blast furnace casting to influence the service life of the blast furnace lining, the strength is not high enough, the bottom castable is required to bear the gravity of the upper castable after hardening, the strength is not high enough, and the castable 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 casting construction method thereof.
The technical scheme of the invention is as follows: the silicon carbide self-flowing 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 consists of the following components in parts by weight: 5-8 parts of crystalline flake graphite, 8-20 parts of silicon carbide, 3-5 parts of ferrotitanium alloy slag, 3-7 parts of vitrified microbeads and 5-12 parts of black silicon carbide;
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 consists of 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, and the fluidity and the cohesiveness 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 a mass ratio of 1:2, wherein the purity of the azodicarbonamide is more than or equal to 97%, and the water content of the basic aluminum lactate is 0.1-5%, so that caking of the explosion-proof agent is avoided.
Further, the adhesive is prepared by mixing magnesium silicate and sodium silicate according to a mass ratio of 2:1, wherein the granularity of the magnesium silicate is 20-60 mu m, the granularity of the sodium silicate is 15-40 mu m, and the adhesive has good adhesive effect.
Further, the curing agent comprises the following components in percentage by mass: 20-35% of aluminate cement, 10-15% of calcium aluminate nano whisker and the balance of silicate cement, wherein the silicate cement can harden the castable, and the calcium aluminate nano whisker can improve the strength of the hardened castable and avoid cracking of the castable.
Further, the particle size of the crystalline flake graphite in the aggregate is 1-2mm, the particle size of the silicon carbide comprises 40-60 mu m and 80-100 mu m, wherein the silicon carbide with the particle size of 40-60 mu m accounts for 60-70% of the total mass of the silicon carbide, the silicon carbide with the particle size of 80-100 mu m accounts for 30-40% of the total mass of the silicon carbide, the particle size of the ferrotitanium alloy slag is 0.8-1.5mm, the particle size of the vitrified micro bubble is 0.5-0.8mm, and the particle size of the black silicon carbide is 0.7-1.2mm, and the particle size can reduce the surface roughness of the casting material after hardening and reduce the friction force between the material and the inner wall of the blast furnace.
Further, the Si content of the metal silicon powder in the composite powder is more than or equal to 98%, the granularity is 15-20 mu m, the granularity of RETaO4 ceramic powder is 5-15 mu m, and the alpha-Al of the corundum powder 2 O 3 The content is more than or equal to 90%, the granularity is 13-20 mu m, the granularity of the titanium dioxide is 1-5 mu m, and the refractory strength of the refractory castable is improved.
Further, 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 strength of the refractory castable is further enhanced by the composite fiber, cracking of the refractory castable is avoided, 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-flowing castable for the blast furnace lining comprises the following steps of:
s1, preparing a castable:
putting the aggregate, the composite powder and the composite fiber into a mixer according to the weight parts, mixing uniformly 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 adopting a shaping refractory material to form a refractory paving layer, wherein the paving thickness is 5-10cm, pumping the castable obtained in the step S1 into the surface of the paving layer, manually leveling uneven places by manpower after the castable self-flow leveling, and curing for 24 hours at 20-40 ℃ after the treatment is completed;
s3, pouring the inner wall of the furnace:
firstly, setting up a mould for the inner wall of a blast furnace in a layering way, wherein the thickness between the mould and the furnace shell is 15-20cm, immersing the surface of a refractory brick into castable, then, laying a layer of refractory brick close to the furnace shell, wherein the laying thickness is 8-10cm, after the laying is finished, introducing the castable into a gap between a template and the refractory brick, introducing the top of the castable to be 1-2cm higher than the top of the refractory brick, laying a layer of refractory brick again, and repeating the steps until the casting of the whole inner wall of the blast furnace is finished;
further, the mixing temperature of the mixed solution and the mixture in the step S1 is 80-90 ℃, and the prepared castable is required to be poured on the surface to be constructed within 1-2 hours after the mixed solution and the mixture are mixed, so that the fluidity of the castable is best in a short time, and the occurrence of air holes in the castable can be avoided, so that the service life of the castable is further influenced.
Further, in the step S3, the construction sequence of the inner wall of the blast furnace is hearth, belly, waist, shaft and throat from bottom to top, each part of construction is required to be maintained for 8-10h after completion, 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 casting can be supported.
The beneficial effects of the invention are as follows:
compared with the existing refractory castable, the refractory castable disclosed by the invention has higher compressive strength, so that the refractory castable is used in the inner wall of a blast furnace, and the castable of the bottom layer has a supporting effect on the castable of the upper layer, so that the castable of the bottom layer cannot crack, has good fluidity, is convenient for the construction of a blast furnace lining, has good cohesiveness with a furnace shell, is not easy to fall off, and has good refractory property, a simple construction method and high construction efficiency.
Drawings
Fig. 1 is a construction flow chart of the castable of the present invention.
Detailed Description
Example 1:
as shown in fig. 1, a silicon carbide self-flowing castable for a 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 consists of the following components in parts by weight: 5 parts of crystalline flake graphite, 8 parts of silicon carbide, 3 parts of ferrotitanium alloy slag, 3 parts of vitrified microbeads and 5 parts of black silicon carbide;
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 consists of 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 cohesiveness 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 1:2, wherein the purity of the azodicarbonamide is 97%, the water content of the basic aluminum lactate is 5%, and the agglomeration of the explosion-proof agent is avoided.
The adhesive is prepared by mixing magnesium silicate and sodium silicate according to a mass ratio of 2:1, 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: the cement containing 20% of aluminate cement, 10% of calcium aluminate nano whisker and the balance of silicate cement, wherein the silicate cement can harden the castable, and the calcium aluminate nano whisker can improve the strength of the hardened castable and avoid cracking of the castable.
The particle size of the crystalline flake graphite in the aggregate is 1-2mm, the particle size of the silicon carbide comprises 40-60 mu m and 80-100 mu m, wherein the silicon carbide with the particle size of 40-60 mu m accounts for 60% of the total mass of the silicon carbide, the silicon carbide with the particle size of 80-100 mu m accounts for 40% of the total mass of the silicon carbide, the particle size of ferrotitanium alloy slag is 0.8-1.5mm, the particle size of vitrified microbeads is 0.5-0.8mm, and the particle size of black diamond sand is 0.7-1.2mm, and the particle size can reduce the surface roughness of the casting material after hardening and reduce the friction force between the material and the inner wall of a blast furnace.
The Si content of the metal silicon powder in the composite powder is 98%, the granularity is 15-20 mu m, the granularity of RETaO4 ceramic powder is 5-15 mu m, and the alpha-Al of 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 refractory 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 strength of refractory castable is further enhanced by the composite fiber, cracking of the refractory castable is avoided, 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-flowing castable for the blast furnace lining comprises the following steps of:
s1, preparing a castable:
putting the aggregate, the composite powder and the composite fiber into a mixer according to the weight parts, mixing uniformly 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 adopting a shaped refractory material to form a refractory paving layer, wherein the paving thickness is 5cm, pumping the castable obtained in the step S1 into the surface of the paving layer, manually leveling uneven places by manpower after the castable is self-leveling, and curing for 24 hours at 20 ℃ after the treatment is completed;
s3, pouring the inner wall of the furnace:
firstly, setting up a mould for the inner wall of a blast furnace in a layering way, wherein the thickness between the mould and the furnace shell is 15-20cm, immersing the surface of a refractory brick into castable, then, laying a layer of refractory brick close to the furnace shell, wherein the laying thickness is 8-10cm, after the laying is finished, introducing the castable into a gap between a template and the refractory brick, introducing 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 ℃, and the prepared castable is required to be poured on the surface to be constructed within 1h after the mixed solution and the mixture are mixed, so that the fluidity of the castable is best in a short time, and the occurrence of air holes in the castable can be avoided, so that the service life of the castable is further influenced.
In the step S3, the construction sequence of the inner wall of the blast furnace is hearth, belly, waist, shaft and throat from bottom to top, each part of construction is required to be maintained for 8 hours, 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 casting can be supported.
Example 2:
the silicon carbide self-flowing 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 consists of the following components in parts by weight: 6 parts of crystalline flake graphite, 11 parts of silicon carbide, 4 parts of ferrotitanium alloy slag, 5 parts of vitrified microbeads and 10 parts of black silicon carbide;
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 fiber, 3 parts of magnesium borate whisker and 2 parts of ceramic fiber cotton;
the additive consists of 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 reducer and 1 part of curing agent, and the fluidity and the cohesiveness 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 1:2, wherein the purity of the azodicarbonamide is 97.5%, and the water content of the basic aluminum lactate is 3%, so that the agglomeration of the explosion-proof agent is avoided.
The adhesive is prepared by mixing magnesium silicate and sodium silicate according to a mass ratio of 2:1, 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 nano whisker and the balance of silicate cement, wherein the silicate cement can harden the castable, and the calcium aluminate nano whisker can improve the strength of the hardened castable and avoid cracking of the castable.
The particle size of the crystalline flake graphite in the aggregate is 1-2mm, the particle size of the silicon carbide comprises 40-60 mu m and 80-100 mu m, wherein the silicon carbide with the particle size of 40-60 mu m accounts for 65% of the total mass of the silicon carbide, the silicon carbide with the particle size of 80-100 mu m accounts for 35% of the total mass of the silicon carbide, the particle size of ferrotitanium alloy slag is 0.8-1.5mm, the particle size of vitrified microbeads is 0.5-0.8mm, and the particle size of black diamond sand is 0.7-1.2mm, and the particle size can reduce the surface roughness of the hardened castable and reduce the friction force between the material and the inner wall of a blast furnace.
The Si content of the metal silicon powder in the composite powder is 98.5%, the granularity is 15-20 mu m, the granularity of RETaO4 ceramic powder is 5-15 mu m, and the alpha-Al of corundum powder 2 O 3 The content is 93%, the granularity is 13-20 mu m, the granularity of titanium dioxide is 1-5 mu m, and the refractory 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 strength of refractory castable is further enhanced by the composite fiber, cracking of the refractory castable is avoided, 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-flowing castable for the blast furnace lining comprises the following steps of:
s1, preparing a castable:
putting the aggregate, the composite powder and the composite fiber into a mixer according to the weight parts, mixing uniformly 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 adopting a shaped refractory material to form a refractory paving layer, wherein the paving thickness is 8cm, pumping the castable obtained in the step S1 into the surface of the paving layer, manually leveling uneven places by manpower after the castable is self-leveling, and curing for 24 hours at 30 ℃ after the treatment is completed;
s3, pouring the inner wall of the furnace:
firstly, setting up a mould for the inner wall of a blast furnace in a layering manner, wherein the thickness between the mould and the furnace shell is 18cm, immersing the surface of refractory bricks in castable, then, tightly attaching the refractory bricks to the furnace shell, paving a layer of refractory bricks with the thickness of 9cm, after the paving is finished, guiding the castable into a gap between a template and the refractory bricks, leading the top of the castable to be 1.5cm higher than the top of the refractory bricks, paving a layer of refractory bricks again, and repeating the steps until the pouring of the whole inner wall of the blast furnace is finished;
in the step S1, the mixing temperature of the mixed solution and the mixture is 85 ℃, and the prepared castable is required to be poured on the surface to be constructed within 1.5 hours after the mixed solution and the mixture are mixed, so that the fluidity of the castable is best in a short time, and the occurrence of air holes in the castable can be avoided, so that the service life of the castable is further influenced.
In the step S3, the construction sequence of the inner wall of the blast furnace is hearth, belly, waist, shaft and throat from bottom to top, each part of construction is required to be maintained for 9 hours, 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 casting can be supported.
Example 3:
the silicon carbide self-flowing 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 consists of the following components in parts by weight: 8 parts of crystalline flake graphite, 20 parts of silicon carbide, 5 parts of ferrotitanium alloy slag, 7 parts of vitrified microbeads and 12 parts of black silicon carbide;
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 consists of 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 cohesiveness 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 1:2, wherein the purity of the azodicarbonamide is 99%, and the water content of the basic aluminum lactate is 0.1%, so that caking of the explosion-proof agent is avoided.
The adhesive is prepared by mixing magnesium silicate and sodium silicate according to a mass ratio of 2:1, 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 nano whisker and the balance of silicate cement, wherein the silicate cement can harden the castable, and the calcium aluminate nano whisker can improve the strength of the hardened castable and avoid cracking of the castable.
The particle size of the crystalline flake graphite in the aggregate is 1-2mm, the particle size of the silicon carbide comprises 40-60 mu m and 80-100 mu m, wherein the silicon carbide with the particle size of 40-60 mu m accounts for 60% of the total mass of the silicon carbide, the silicon carbide with the particle size of 80-100 mu m accounts for 40% of the total mass of the silicon carbide, the particle size of ferrotitanium alloy slag is 0.8-1.5mm, the particle size of vitrified microbeads is 0.5-0.8mm, and the particle size of black diamond sand is 0.7-1.2mm, and the particle size can reduce the surface roughness of the casting material after hardening and reduce the friction force between the material and the inner wall of a blast furnace.
The Si content of the metal silicon powder in the composite powder is 99%, the granularity is 15-20 mu m, the granularity of RETaO4 ceramic powder is 5-15 mu m, and the alpha-Al of corundum powder 2 O 3 97% of the total weight of the granulesThe degree is 13-20 mu m, the granularity of the titanium dioxide is 1-5 mu m, and the refractory 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 strength of refractory castable is further enhanced by the composite fiber, cracking of the refractory castable is avoided, 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-flowing castable for the blast furnace lining comprises the following steps of:
s1, preparing a castable:
putting the aggregate, the composite powder and the composite fiber into a mixer according to the weight parts, mixing uniformly 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 adopting a shaped refractory material to form a refractory paving layer, wherein the paving thickness is 10cm, pumping the castable obtained in the step S1 into the surface of the paving layer, manually leveling uneven places by manpower after the castable is self-leveling, and curing for 24 hours at 40 ℃ after the treatment is completed;
s3, pouring the inner wall of the furnace:
firstly, setting up a mould for the inner wall of a blast furnace in a layered manner, wherein the thickness between the mould and the furnace shell is 20cm, immersing the surface of a refractory brick into castable, then, tightly attaching the refractory brick to the furnace shell, paving a layer of refractory brick with the thickness of 10cm, after the paving is finished, guiding the castable into a gap between a template and the refractory brick, guiding the top of the castable to be 2cm higher than the top of the refractory brick, paving a layer of refractory brick again, and repeating the steps until the pouring of the whole inner wall of the blast furnace is finished;
in the step S1, the mixing temperature of the mixed solution and the mixture is 90 ℃, and the prepared castable is required to be poured on the surface to be constructed within 2 hours after the mixed solution and the mixture are mixed, so that the fluidity of the castable is best in a short time, and the occurrence of air holes in the castable can be avoided, so that the service life of the castable is further influenced.
In the step S3, the construction sequence of the inner wall of the blast furnace is sequentially a hearth, a furnace belly, a furnace waist, a furnace body and a furnace throat from bottom to top, each part of construction is required to be maintained for 10 hours, 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 casting can be supported.
Comparative examples 1-3 the castable prepared in example 3 had the best fluidity and the highest fire resistance during actual casting, and the highest surface strength during use of the inner wall of the blast furnace, so example 3 was the best example.

Claims (4)

1. The silicon carbide self-flowing 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 consists of the following components in parts by weight: 5-8 parts of crystalline flake graphite, 8-20 parts of silicon carbide, 3-5 parts of ferrotitanium alloy slag, 3-7 parts of vitrified microbeads and 5-12 parts of black silicon carbide;
the composite powder comprises the following components in parts by weight: 3-5 parts of metal silicon powder, 4-8 parts of RETaO 4 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 consists of 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;
the explosion-proof agent is prepared by mixing azodicarbonamide and basic aluminum lactate according to a mass ratio of 1:2, wherein the purity of the azodicarbonamide is more than or equal to 97%, and the water content of the basic aluminum lactate is 0.1-5%;
the adhesive is prepared by mixing magnesium silicate and sodium silicate according to a mass ratio of 2:1, wherein the granularity of the magnesium silicate is 20-60 mu m, and the granularity of the sodium silicate is 15-40 mu m;
the curing agent comprises the following components in percentage by mass: 20-35% of aluminate cement, 10-15% of calcium aluminate nano whisker and the balance of silicate cement;
the grain size of the crystalline flake graphite in the aggregate is 1-2mm, the grain size of the silicon carbide comprises 40-60 mu m and 80-100 mu m, wherein the silicon carbide with the grain size of 40-60 mu m accounts for 60-70% of the total mass of the silicon carbide, the silicon carbide with the grain size of 80-100 mu m accounts for 30-40% of the total mass of the silicon carbide, the grain size of ferrotitanium alloy slag is 0.8-1.5mm, the grain size of vitrified micro-beads is 0.5-0.8mm, and the grain size of black silicon carbide is 0.7-1.2mm;
the 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, and the RETaO 4 The granularity of the ceramic powder is 5-15 mu m, and the alpha-Al of the corundum powder 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;
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.
2. The casting construction method of the silicon carbide self-flowing castable for the blast furnace lining according to claim 1, 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, mixing uniformly 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 adopting a shaping refractory material to form a refractory paving layer, wherein the paving thickness is 5-10cm, pumping the castable obtained in the step S1 into the surface of the paving layer, manually leveling uneven places by manpower after the castable self-flow leveling, and curing for 24 hours at 20-40 ℃ after the treatment is completed;
s3, pouring the inner wall of the furnace:
firstly, setting up a mould for the inner wall of a blast furnace in a layered manner, wherein the thickness between the mould and the furnace shell is 15-20cm, immersing the surface of a refractory brick into castable, then laying a layer of refractory brick close to the furnace shell, wherein the laying thickness is 8-10cm, after the laying is finished, introducing the castable into a gap between a template and the refractory brick, leading the top of the castable to be 1-2cm higher than the top of the refractory brick, laying a layer of refractory brick again, and repeating the steps until the casting of the whole inner wall of the blast furnace is finished.
3. The casting construction method of the silicon carbide self-flowing castable for the blast furnace lining according to claim 2, wherein the mixing temperature of the mixed solution and the mixture in the step S1 is 80-90 ℃, and the prepared castable is required to be cast on a surface to be constructed within 1-2h after the mixed solution and the mixture are mixed.
4. The pouring construction method of the silicon carbide self-flowing castable for the blast furnace lining according to claim 2, wherein in the step S3, the construction sequence of the inner wall of the blast furnace is hearth, belly, waist, shaft and throat from bottom to top, each part of construction is completed and needs maintenance for 8-10h, and then the next part of construction is performed.
CN202211230250.5A 2022-10-08 2022-10-08 Silicon carbide self-flow castable for blast furnace lining and casting construction method thereof Active CN115536408B (en)

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