CN114804823A - Heat-insulating refractory material for air supply device of iron-making blast furnace - Google Patents

Heat-insulating refractory material for air supply device of iron-making blast furnace Download PDF

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Publication number
CN114804823A
CN114804823A CN202210556246.1A CN202210556246A CN114804823A CN 114804823 A CN114804823 A CN 114804823A CN 202210556246 A CN202210556246 A CN 202210556246A CN 114804823 A CN114804823 A CN 114804823A
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percent
supply device
air supply
blast furnace
heat
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CN202210556246.1A
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张立鸽
陈现华
张江伟
孙建华
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Luohe Xinshitong Metallurgical Equipment Co ltd
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Luohe Xinshitong Metallurgical Equipment Co ltd
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Abstract

The invention belongs to the field of refractory materials, and particularly relates to a heat-insulating refractory material for an air supply device of an iron-making blast furnace, which comprises the following components in percentage by weight: flint clay aggregate: 3-5 mm: 10-15%, 1-3 mm: 5-10%, 0-1 mm: 20 to 25 percent; 5-10% of silicon micro powder, 6-12% of kyanite, 5-8% of alpha-alumina, 7-12% of high alumina bauxite powder, 8-15% of cement, 3-8% of chromium oxide green, 0.5-1% of melamine, 0.5-1% of hexametaphosphate, 2-5% of floating bead and 1-3% of explosion-proof fiber; 7-12% of water is added externally. The refractory material obtained by the invention has high refractoriness, high breaking strength and compressive strength, small linear change rate, small density, small heat conductivity coefficient, high temperature resistance, scouring resistance, oxidation resistance, long service life, stable performance, good heat insulation and preservation effects, and ensures the safe use of the blast furnace air supply device.

Description

Heat-insulating refractory material for air supply device of iron-making blast furnace
Technical Field
The invention belongs to the field of refractory materials, and particularly relates to a heat-insulating refractory material for an air supply device of an iron-making blast furnace.
Background
The air supply device is key equipment of iron-making blast furnace, its stability and heat-insulating property relate to several indexes of stable operation of blast furnace, furnace coke ratio reduction and iron yield, etc., and the core influencing the performance of air supply device is the used refractory material, and the air supply device is made of refractory material with anti-heavy load softening, refractoriness 1790 deg.C and several indexes of resisting scouring, resisting corrosion, resisting oxidation and small linear change rate, etc., the traditional air supply device refractory material uses brown corundum as aggregate, alpha-alumina, high alumina fine powder and kyanite as main raw material, and uses pure calcium aluminate cement as binding agent to make refractory heat-insulating pouring material, and its strength, linear change rate and high-temperature heavy load softening temperature basically meet the use requirements, but it has no high-temperature heavy load softening temperature, and its surface temperature can be up to 450 deg.C in the course of blast furnace operation, so that it not only can cause large quantity of heat loss, the damage to the working environment of the staff and the environmental protection is great. Therefore, the research on the heat-insulating refractory material for the air supply device of the iron-making blast furnace and the preparation method thereof have important significance.
The Chinese patent application with the publication number of CN111763092A discloses a high-temperature wear-resistant composite material with anti-slagging property, which consists of corundum fine powder, aluminum dihydrogen phosphate, kyanite, pure calcium aluminate cement, silica micro powder, rho-alumina, fine ceramic powder, magnesia-alumina spinel, sodium tripolyphosphate and explosion-proof fibers. The material has high strength and good wear resistance, is used for resisting the abrasion of solid materials and the scouring of hot air flow, has excellent volume density and stability, is acid-base resistant, is used for resisting the erosion of acid-base substances in a furnace, has good thermal shock stability, is used for resisting the damage of the change of the furnace temperature to the material, has good erosion resistance, is used for avoiding the furnace lining from cracking caused by the erosion, and greatly prolongs the service cycle. Chinese patent with publication number CN108558376A discloses a high-performance mullite castable and a manufacturing method thereof, and the high-performance mullite castable comprises the following raw material components in percentage by weight: 65-75% of fused mullite aggregate, 10-20% of white corundum powder, 1-8% of zirconium silicon micro powder, 2-10% of calcined alumina powder, 1-5% of fused pure calcium aluminate cement, 2-5% of kyanite powder and 2-5% of sillimanite powder; 1-6% of zircon powder; the high-performance mullite castable is prepared from 100 percent of raw materials by weight, and is additionally provided with nano calcium carbonate accounting for 0.1-1 percent of the total weight of the raw materials and a polycarboxylic acid water reducing agent accounting for 0.1-0.5 percent of the total weight of the raw materials. The castable disclosed by the invention has high refractoriness and thermal shock stability, the high-temperature wear resistance is greatly improved, the high-temperature performance and the service performance of the traditional castable are improved, and the problem that the castable is easy to strip in the using process is solved. However, the above patent uses corundum as an aggregate, and the obtained refractory material has high density and does not consider heat insulation performance, and is not suitable for use in an air supply device of an iron-making blast furnace.
Disclosure of Invention
In order to overcome the defects, the invention aims to provide the heat-insulating refractory material for the air supply device of the iron-making blast furnace, which has the advantages of high temperature resistance, scouring resistance, oxidation resistance, long service life, stable performance and good heat-insulating and heat-preserving effects.
In order to achieve the purpose, the invention adopts the following technical scheme:
a heat insulation refractory material for an air supply device of an iron-making blast furnace comprises the following components in percentage by weight:
flint clay aggregate: 3-5 mm: 10 to 15 percent
1-3mm：5-10％
0-1mm：20-25％
5 to 10 percent of silicon powder
6 to 12 percent of kyanite
5-8% of alpha-alumina
7 to 12 percent of high-alumina bauxite powder
8 to 15 percent of cement
3 to 8 percent of chromium oxide green
0.5 to 1 percent of melamine
0.5 to 1 percent of hexametaphosphate
2 to 5 percent of floating bead
1-3% of explosion-proof fiber;
7-12% of water is added externally.
Preferably, Al in the flint clay aggregate 2 O 3 The content is more than or equal to 47 percent.
Preferably, the cement is calcium aluminate cement.
Preferably, the content of aluminum oxide in the alpha-alumina is more than or equal to 99 percent, and the particle size is 0.5-3 um.
Preferably, the preparation method of the heat-insulating refractory material comprises the following steps: preparing various raw materials according to the weight percentage, uniformly stirring, pouring the raw materials into a steel shell of an air supply device, and baking the raw materials to be stable to obtain the composite material.
The invention has the following positive beneficial effects:
1. the invention adopts flint clay aggregate, silicon micropowder, alpha-alumina, kyanite, high alumina bauxite powder and chromium oxide green as base materials, calcium aluminate cement as a bonding agent, melamine and hexametaphosphate as water reducing agents, floating beads as heat-insulating materials and explosion-proof fibers as explosion-proof materials, and the interaction among the raw materials is as follows:
the flint clay aggregate plays a main skeleton role in refractory materials, the flint clay forms a mullite phase at the high temperature of 1300 ℃, the coagulability is good, the volume is stable, the strength of the refractory material is high, the stability is good, the heat conductivity is low, and the obtained refractory material has a heat insulation function under the quality characteristic of high strength and scouring resistance; the floating beads are added to form a microporous structure in the refractory material, so that the thermal conductivity is reduced, the heat insulation performance is improved, the density of the refractory material is reduced after the microporous structure is formed, in order to ensure the strength of the refractory material, pure calcium aluminate cement is used as a bonding agent, has higher refractoriness and stability, and can form a base material into a ceramic shape through phase change at high temperature, so that the strength of the refractory material is improved; the gaps between the aggregates are eliminated by different particle sizes of the aggregates, the refractory material is filled by chromium oxide green, alpha-alumina and high-alumina bauxite powder, the alpha-alumina has the characteristic of high refractoriness and good fluidity, the high-alumina bauxite powder has small expansion coefficient, high refractoriness and good chemical stability, and is filled into the gaps between the aggregates, so that the refractoriness and stability of the refractory material are improved, and the purpose of corrosion resistance and oxidation resistance is achieved by using the oxidation resistance of chromium elements of the chromium oxide green; in order to ensure that the refractory material has good ramming flow and the strength of the refractory material is controlled by reducing the water addition amount, the fluidity of the refractory material is improved by adding the silicon micropowder, and the viscosity of the refractory material is increased by adding the melamine and the hexametaphosphate, so that the construction is facilitated; in order to ensure the stability of the refractory material and prevent the hot and cold alternately generating cracks and peeling, the refractory material uses the kyanite as an expanding agentIn order to prevent steam explosion caused by instant separation of steam formed by internal ionized water when the refractory material is rapidly cooled and heated, a certain amount of explosion-proof fiber is added, the low-temperature explosion-proof fiber begins to melt at 100 ℃, and a fine channel is formed in the refractory material so as to facilitate the discharge of excessive water in the refractory material. The raw materials are used together, and the volume density of the refractory material obtained by the invention is 2.2-2.5g/cm 3 The density is small, the heat conductivity coefficient is small, and the heat preservation performance is excellent; the refractoriness reaches 1800-1900 ℃, and the refractoriness is high; the rupture strength and the compressive strength are high, the mechanical property is excellent, and the scouring resistance and the oxidation resistance are realized; the linear change rate is less than or equal to 0.08 percent, the linear change rate is small, and the thermal stability is high. The refractory material disclosed by the invention is high-temperature resistant, scouring resistant, oxidation resistant, long in service life, stable in performance and good in heat insulation and preservation effects, and ensures the safe use of the air supply device of the iron-making blast furnace at the temperature of 1350-.
Detailed Description
The invention will be further illustrated with reference to some specific embodiments.
Example 1
A heat insulation refractory material for an air supply device of an iron-making blast furnace comprises the following components in percentage by weight:
flint clay aggregate: 3-5 mm: 10 percent of
1-3mm：10％
0-1mm：20％
6 percent of silicon micropowder
12 percent of kyanite
8 percent of alpha-alumina
12 percent of high-alumina bauxite powder
9 percent of calcium aluminate cement
Chromium oxide Green 5%
0.5 percent of melamine
0.5 percent of hexametaphosphate
5 percent of floating bead
2% of explosion-proof fiber;
7 percent of water is added externally.
Further, Al in the flint clay aggregate 2 O 3 The content is more than or equal to 47 percent.
Furthermore, the content of aluminum oxide in the alpha-alumina is 99.6 percent, and the grain diameter is 0.5-3 um.
Example 2
A heat insulation refractory material for an air supply device of an iron-making blast furnace comprises the following components in percentage by weight:
flint clay aggregate: 3-5 mm: 12 percent of
1-3mm：6％
0-1mm：22％
8 percent of silicon micropowder
10 percent of kyanite
Alpha-alumina 7%
10 percent of high-alumina bauxite powder
13 percent of calcium aluminate cement
Chromium oxide Green 3%
1 percent of melamine
1 percent of hexamethocyanamide
4 percent of floating bead
3% of explosion-proof fiber;
8 percent of water is added externally.
Further, Al in the flint clay aggregate 2 O 3 The content is more than or equal to 47 percent.
Furthermore, the content of aluminum oxide in the alpha-alumina is 99.8 percent, and the grain diameter is 0.5-3 um.
Example 3
A heat insulation refractory material for an air supply device of an iron-making blast furnace comprises the following components in percentage by weight:
flint clay aggregate: 3-5 mm: 13 percent of
1-3mm：8％
0-1mm：25％
7 percent of silicon micropowder
11 percent of kyanite
Alpha-alumina 6%
High alumina bauxite powder 9%
8 percent of calcium aluminate cement
4 percent of chromium oxide green
0.5 percent of melamine
1 percent of hexamethocyanamide
4.5 percent of floating bead
3% of explosion-proof fiber;
11 percent of water is added externally.
Further, Al in the flint clay aggregate 2 O 3 The content is more than or equal to 47 percent.
Furthermore, the content of aluminum oxide in the alpha-alumina is 99.5 percent, and the grain diameter is 0.5-3 um.
Example 4
A heat insulation refractory material for an air supply device of an iron-making blast furnace comprises the following components in percentage by weight:
flint clay aggregate: 3-5 mm: 11 percent
1-3mm：10％
0-1mm：21％
5 percent of silicon micropowder
7 percent of kyanite
8 percent of alpha-alumina
8 percent of high-alumina bauxite powder
15 percent of calcium aluminate cement
Chromium oxide green 8%
1 percent of melamine
1 percent of hexamethocyanamide
4 percent of floating bead
1% of explosion-proof fiber;
10 percent of water is added externally.
Further, Al in the flint clay aggregate 2 O 3 The content is more than or equal to 47 percent.
Furthermore, the content of aluminum oxide in the alpha-alumina is 99 percent, and the grain diameter is 0.5 to 3 um.
Example 5
A heat insulation refractory material for an air supply device of an iron-making blast furnace comprises the following components in percentage by weight:
flint clay aggregate: 3-5 mm: 14 percent of
1-3mm：9％
0-1mm：24％
9 percent of silicon micropowder
6 percent of kyanite
Alpha-alumina 5%
7 percent of high-alumina bauxite powder
Calcium aluminate cement 14%
Chromium oxide green 6%
1 percent of melamine
1 percent of hexamethocyanamide
2 percent of floating bead
2% of explosion-proof fiber;
12 percent of water is added externally.
Further, Al in the flint clay aggregate 2 O 3 The content is more than or equal to 47 percent.
Furthermore, the content of aluminum oxide in the alpha-alumina is 99.5 percent, and the grain diameter is 0.5-3 um.
Example 6
A heat insulation refractory material for an air supply device of an iron-making blast furnace comprises the following components in percentage by weight:
flint clay aggregate: 3-5 mm: 15 percent of
1-3mm：5％
0-1mm：21％
10 percent of silicon micropowder
10 percent of kyanite
Alpha-alumina 7%
10 percent of high-alumina bauxite powder
10 percent of calcium aluminate cement
Chromium oxide Green 5%
0.5 percent of melamine
0.5 percent of hexametaphosphate
3 percent of floating bead
3% of explosion-proof fiber;
10 percent of water is added externally.
Further, Al in the flint clay aggregate 2 O 3 The content is more than or equal to 47 percent.
Furthermore, the content of aluminum oxide in the alpha-alumina is 99.2 percent, and the grain diameter is 0.5 to 3 um.
Various raw materials are prepared according to the weight percentage of the invention in the embodiment 1-6, are uniformly stirred, are poured into a steel shell of an air supply device, and are stabilized after being baked, and the performance parameters of the obtained heat-insulating refractory material are shown in the following table 1.
TABLE 1 Performance test results of heat-insulating and refractory materials for blast apparatus of iron-making blast furnace according to the present invention
Figure BDA0003654906240000081
As can be seen from Table 1, the refractory obtained by the present invention has a bulk density of 2.2 to 2.5g/cm 3 The density is small, the heat conductivity coefficient is small, and the heat preservation performance is excellent; the refractoriness reaches 1800-1900 ℃, and the refractoriness is high; the rupture strength and the compressive strength are high, the mechanical property is excellent, and the scouring resistance and the oxidation resistance are realized; the linear change rate is less than or equal to 0.08 percent, the linear change rate is small, and the thermal stability is high. The refractory material has the advantages of high temperature resistance, scouring resistance, oxidation resistance, long service life, stable performance and good heat insulation effect, and ensures the safe use of the blast furnace air supply device for iron making.
Finally, the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting, and other modifications or equivalent substitutions made by the technical solutions of the present invention by those of ordinary skill in the art should be covered within the scope of the claims of the present invention as long as they do not depart from the spirit and scope of the technical solutions of the present invention.

Claims (5)

1. A heat insulation refractory material for an air supply device of an iron-making blast furnace is characterized by comprising the following components in percentage by weight:
flint clay aggregate: 3-5 mm: 10 to 15 percent of
1-3mm：5-10％
0-1mm：20-25％
5 to 10 percent of silicon powder
6 to 12 percent of kyanite
5-8% of alpha-alumina
7 to 12 percent of high-alumina bauxite powder
8 to 15 percent of cement
3 to 8 percent of chromium oxide green
0.5 to 1 percent of melamine
0.5 to 1 percent of hexametaphosphate
2 to 5 percent of floating bead
1-3% of explosion-proof fiber;
7-12% of water is added externally.
2. The heat-insulating refractory material for an air supply device of an ironmaking blast furnace as claimed in claim 1, wherein Al is contained in the flint clay aggregate 2 O 3 The content is more than or equal to 47 percent.
3. The heat-insulating refractory for the air supply device of the ironmaking blast furnace as claimed in claim 1, wherein the cement is calcium aluminate cement.
4. The heat-insulating refractory material for the air supply device of the ironmaking blast furnace as claimed in claim 1, wherein the content of aluminum oxide in the alpha-alumina is not less than 99%, and the particle size is 0.5-3 um.
5. The heat-insulating refractory for the air supply device of the ironmaking blast furnace according to any one of claims 1 to 4, characterized in that the preparation method of the heat-insulating refractory comprises the following steps: preparing various raw materials according to the weight percentage, uniformly stirring, pouring the raw materials into a steel shell of an air supply device, and baking the raw materials to be stable to obtain the composite material.
CN202210556246.1A 2022-05-20 2022-05-20 Heat-insulating refractory material for air supply device of iron-making blast furnace Withdrawn CN114804823A (en)

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CN106946578A (en) * 2017-03-23 2017-07-14 浙江华尔耐科技股份有限公司 A kind of limekiln permanent robust type insulating brick
CN111499400A (en) * 2020-04-27 2020-08-07 河南省宏达炉业有限公司 High-strength low-rebound fireproof spray coating and preparation method thereof

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CN101525244A (en) * 2009-03-26 2009-09-09 中钢集团洛阳耐火材料研究院有限公司 Preparation method for middle density wear-resistant refractory casting material
CN102815954A (en) * 2012-08-29 2012-12-12 秦皇岛北方管业有限公司 High-performance heat-insulation wear-resistant material and preparation method thereof
CN106946578A (en) * 2017-03-23 2017-07-14 浙江华尔耐科技股份有限公司 A kind of limekiln permanent robust type insulating brick
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* Cited by examiner, † Cited by third party
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