CN111018547B - Light spray coating for blast furnace taphole smoke hood - Google Patents

Light spray coating for blast furnace taphole smoke hood Download PDF

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CN111018547B
CN111018547B CN201911081491.6A CN201911081491A CN111018547B CN 111018547 B CN111018547 B CN 111018547B CN 201911081491 A CN201911081491 A CN 201911081491A CN 111018547 B CN111018547 B CN 111018547B
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light
spray coating
blast furnace
smoke hood
parts
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CN111018547A (en
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朱国平
王立旺
向若飞
李新明
朱其良
王琪
彭晶晶
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Zhejiang Kingcred New Material Co ltd
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    • C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
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    • C04B33/00—Clay-wares
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Abstract

The invention relates to a light spray coating for a blast furnace tapping hole smoke hood, which comprises the following components in parts by weight: 8-15 parts of light weight aggregate brick particles, 15-25 parts of light weight ceramsite, 18-28 parts of expanded perlite, 10-20 parts of diatomite powder, 15-25 parts of quick hardening aluminate cement, 5-8 parts of clay, 3-6 parts of glass powder and 0.1-0.2 part of organic explosion-proof fiber. By adopting the formula, the invention has lower volume density and heat conductivity coefficient, higher low-temperature and high-temperature strength, can play an effective protection role on the metal structure of the taphole smoke hood, and realizes the on-line repair of the smoke hood.

Description

Light spray coating for blast furnace taphole smoke hood
Technical Field
The invention belongs to the technical field of refractory materials, and particularly relates to a light spray coating for a blast furnace taphole smoke hood.
Background
A blast furnace casting house is used as a main platform for blast furnace smelting production, and smoke dust generated by the casting house at a casting hole and a swinging nozzle is a main pollution source of the blast furnace. Along with the intensified smelting and large-scale of blast furnaces and the scientization of production flows, the cast house also provides a concept of a clean factory, if effective flue gas trapping and purifying measures are not taken, the environmental pollution caused by the flue gas is more and more serious, and particularly under the condition that the current environment protection situation is more and more severe, the clean production of the blast furnaces is realized. In order to reduce the labor intensity of workers, improve the labor productivity and meet the increasingly strict requirements of environmental protection emission standards, the treatment of the smoke dust of a blast furnace casting house is urgently needed. The amount of the smoke and dust emitted from the tapping hole accounts for about 85 percent of the amount of the smoke and dust generated in the whole tapping field, and the smoke and dust is particularly concentrated at the tapping hole, the iron blocking hole and the later tapping period. In the working process, the dust removing equipment is inevitably subjected to strong radiation of high-temperature flue gas, the temperature of the flue gas in the smoke hood reaches 600-800 ℃, even a small amount of high-speed scouring of particles mixed in the flue gas is carried out, and the smoke hood is protected by adopting refractory materials. Because the inner lining of the smoke hood faces downwards, the problem that a shaped refractory product is difficult to fix is solved, the inner lining prepared by adopting the castable needs the steps of formwork erecting, pouring, baking, hoisting and the like, the period is long, online repair cannot be realized, if the castable refractory partially falls off, a worker can enter the castable to pry off part after the temperature is reduced to room temperature, manual pouring is carried out after the formwork is erected again, the lining can be put into use after 3 days of maintenance after pouring, the service life of the inner lining after the repair mode is short, and the running efficiency of the furnace is reduced. The light spray paint is used as the lining of the smoke hood, the smoke temperature requirement can be completely met, the light spray paint is used as a direct radiation heating surface, the heat absorption capacity is large, the oxidation and alternating thermal stress caused by frequent and rapid changes of the thermal load of the main body structure of the smoke hood can be avoided, the reliability of the smoke hood is improved, and the pollution smoke dust of the tap hole is effectively treated. The Chinese patent application with the application number of 201310528223.0 discloses a light mullite refractory spray coating, the volume density of the adopted raw materials such as low-aluminum mullite, super-grade kaolin and the like is relatively large, and the effect of reducing the volume density of the spray coating is limited; the high-strength light energy-saving ceramic spray coating prepared by the Chinese patent application with the application number of 201710001320.2 mainly depends on pure calcium aluminate cement to generate a bonding effect, the temperature of smoke in the taphole smoke hood reaches 600-800 ℃, and the technology is just a weak stage of the bonding strength of the pure calcium aluminate cement under the temperature condition, and is not suitable for being applied to the working environment of the taphole smoke hood of a blast furnace. In Chinese patent with patent numbers ZL201310531304.6 and ZL201310528892.8, raw perlite is adopted as a raw material, a spray coating is easy to crack at high temperature, and aluminum borate whiskers adopted belong to inorganic fibers and are difficult to promote the improvement of the explosion-proof performance of the spray coating.
Disclosure of Invention
The invention aims to solve the technical problem of providing the light spray coating for the blast furnace taphole smoke hood, which has the advantages of lower volume density and heat conductivity coefficient, higher low-temperature and high-temperature strength, and can play an effective protection role on the metal structure of the taphole smoke hood and realize the on-line repair of the smoke hood.
In order to solve the technical problems, the invention provides a light spray coating for a blast furnace tapping hole smoke hood, which comprises the following components in parts by weight:
Figure BDA0002264105000000021
preferably, the light gathering brick particles are recycled light gathering brick particles, and Al of the recycled light gathering brick particles2O3Is not less than 40 percent.
Preferably, the granularity of the poly light brick particles is 3-5 mm.
Preferably, the granularity of the light ceramsite is 1-3 mm.
Preferably, the particle size of the expanded perlite is 0-1 mm.
Preferably, Al in the quick-hardening high-alumina cement2O3Is not less than 50 percent.
Preferably, the glass frit has a melting temperature of about 550 ℃.
Preferably, the construction mode of the light spray coating for the blast furnace tapping hole smoke hood is a dry method or a semi-dry method.
The invention has the beneficial effects that:
1. the invention selects the poly light brick particles, the light ceramsite, the expanded perlite, the diatomite and the like as main raw materials, and the poly light brick and the light ceramsite contain a large number of macroscopic pores, so that the volume density and the heat conductivity coefficient of the spray coating can be effectively reduced. The diatomite has the characteristics of large porosity, stable chemical property, wear resistance, heat resistance and the like, can provide excellent surface smoothness for spray paint and improve adhesive force, and plays an effective protection role for the metal structure of the taphole smoke hood.
2. The invention adopts recycled light-gathering brick particles, and reduces the cost on the premise of ensuring the performance.
3. The invention adds the quick hardening aluminate cement, the clay, the glass powder and other components as the matrix, utilizes the quick hardening aluminate cement to improve the low temperature strength of the light spraying material, utilizes the liquid phase combination of the glass powder under the using condition to form closed air holes in the spraying material, and can improve the strength. On the one hand, the method is favorable for improving the cohesiveness of the spray coating, the rebound rate is reduced, on the other hand, the low-temperature strength and the high-temperature strength of a spray coating can be improved, the condensation and hardening of cement are promoted, the spraying mode is adopted for construction, the flexibility of product application is increased, the on-line repair of the smoke hood can be realized, an effective protective layer can be formed on the smoke hood lining, the oxidation corrosion of the smoke hood is avoided, the whole weight of the equipment can be reduced, and the normal production is ensured.
Detailed Description
Example 1
A light spray coating for a blast furnace tapping hole smoke hood comprises the following components in parts by weight:
Figure BDA0002264105000000041
wherein the light gathering brick particles are recycled light gathering brick particles, and Al of the light gathering brick particles2O3The mass percentage content of (A) is not less than 40%; al in the quick-hardening high-alumina cement2O3The mass percentage content of (A) is not less than 50%; the melting temperature of the glass powder is about 550 ℃. The mixed light spraying material for the blast furnace tapping hole smoke hood is constructed by adopting a dry method or a semi-dry method.
Example 2
A light spray coating for a blast furnace tapping hole smoke hood comprises the following components in parts by weight:
Figure BDA0002264105000000042
wherein the content of the first and second substances,the poly light brick particles are recycled poly light brick particles, and Al of the poly light brick particles2O3The mass percentage content of (A) is not less than 40%; al in the quick-hardening high-alumina cement2O3The mass percentage content of (A) is not less than 50%; the melting temperature of the glass powder is about 550 ℃. The mixed light spraying material for the blast furnace tapping hole smoke hood is constructed by adopting a dry method or a semi-dry method.
Example 3
A light spray coating for a blast furnace tapping hole smoke hood comprises the following components in parts by weight:
Figure BDA0002264105000000051
wherein the light gathering brick particles are recycled light gathering brick particles, and Al of the light gathering brick particles2O3The mass percentage content of (A) is not less than 40%; al in the quick-hardening high-alumina cement2O3The mass percentage content of (A) is not less than 50%; the melting temperature of the glass powder is about 550 ℃. The mixed light spraying material for the blast furnace tapping hole smoke hood is constructed by adopting a dry method or a semi-dry method.
Example 4
A light spray coating for a blast furnace tapping hole smoke hood comprises the following components in parts by weight:
Figure BDA0002264105000000052
Figure BDA0002264105000000061
wherein the light gathering brick particles are recycled light gathering brick particles, and Al of the light gathering brick particles2O3The mass percentage content of (A) is not less than 40%; al in the quick-hardening high-alumina cement2O3The mass percentage content of (A) is not less than 50%; the melting temperature of the glass powder is about 550 ℃. The mixed light spraying material for the blast furnace tapping hole smoke hood is constructed by adopting a dry method or a semi-dry method.
The properties of the light spray coating for the blast furnace taphole smoke hood prepared in the above examples 1 to 4 are as follows:
Figure BDA0002264105000000062
the aggregate and the matrix of the light-weight spray coating for the blast furnace taphole smoke hood prepared by the invention basically and completely adopt light-weight materials as raw materials, the adopted recycled light-weight bricks and light-weight ceramsite contain a large number of macroscopic pores, the volume density and the heat conductivity coefficient of the spray coating can be effectively reduced, and the diatomite has the characteristics of large porosity, stable chemical property, wear resistance, heat resistance and the like, and can provide excellent surface smoothness and improve adhesive force for the spray coating. The volume density of the prepared light spray coating is 1.0g/cm3And the material cost is reduced, and the metal structure of the tap hole smoke hood is effectively protected.
By adding the components such as the quick-hardening aluminate cement, the clay, the glass powder and the like, the low-temperature strength of the light spray paint is improved by utilizing the quick-hardening aluminate cement, and the closed air holes are formed in the spray paint and the strength can be improved by utilizing the liquid phase combination generated by the glass powder under the use condition. On the one hand, the adhesion of the spray coating is favorably improved, the rebound rate is reduced, on the other hand, the low-temperature strength and the high-temperature strength of the spray coating can be improved, the rapid hardening of the spray coating is promoted, the spraying mode is adopted for construction, the application flexibility of the product is increased, the anti-burst performance of the spray coating is good, the hot-state online repairing of the smoke hood can be realized by application, an effective protective layer can be formed on the smoke hood lining, the oxidation corrosion of the smoke hood is avoided, the whole weight of the equipment can be reduced, and the normal operation of production is ensured.
The above description is illustrative and not restrictive. Many modifications and variations of the present invention will be apparent to those skilled in the art in light of the above teachings, which will fall within the spirit and scope of the invention.

Claims (8)

1. The light spray coating for the blast furnace taphole smoke hood is characterized by comprising the following components in parts by weight:
Figure FDA0002264104990000011
2. the light weight spray coating for blast furnace tapping hole hood according to claim 1, wherein the light weight agglomerated brick particles are recycled light weight agglomerated brick particles, and Al thereof is2O3Is not less than 40 percent.
3. The light-weight spray coating for the blast furnace tapping hole smoke hood according to claim 1 or 2, wherein the particle size of the light-weight polymer brick particles is 3-5 mm.
4. The light-weight spray coating for the blast furnace tapping hole smoke hood according to claim 1, wherein the particle size of the light-weight ceramsite is 1-3 mm.
5. The light-weight spray coating for the blast furnace tapping hole smoke hood according to claim 1, wherein the particle size of the expanded perlite is 0-1 mm.
6. The light weight spray coating for blast furnace tapping hole hood according to claim 1, wherein Al in said fast hardening high alumina cement2O3Is not less than 50 percent.
7. The light weight spray coating for a blast furnace tapping hole hood according to claim 1, wherein the melting temperature of the glass powder is about 550 ℃.
8. The light weight spray coating for the blast furnace tapping hole smoke hood according to claim 1, characterized in that the construction mode of the light weight spray coating for the blast furnace tapping hole smoke hood is a dry method or a semi-dry method.
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CN112279659B (en) * 2020-10-28 2022-12-09 长兴兴鹰新型耐火建材有限公司 Multi-groove-position stirrer for preparing refractory spray paint
CN113788687B (en) * 2021-08-16 2022-08-26 中冶武汉冶金建筑研究院有限公司 Preparation method of aluminum-silicon wear-resistant spray coating for thermal state repair

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CN103553674A (en) * 2013-10-28 2014-02-05 程巧娜 Heat-resisting spraying material
CN109650854A (en) * 2018-12-25 2019-04-19 郑州真金耐火材料有限责任公司 Corundum-mullite composite brick and preparation method thereof

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CN101880170A (en) * 2010-05-24 2010-11-10 北京通达耐火技术股份有限公司 Preparation method of low-density low-thermal conductivity wet spray heat insulating material
CN102503465A (en) * 2011-10-25 2012-06-20 浙江锦诚耐火材料有限公司 Light thermal insulation sprayed material
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CN103396130A (en) * 2013-07-25 2013-11-20 浙江锦诚耐火材料有限公司 Hot-blast furnace pipeline spray paint and application method thereof
CN103553674A (en) * 2013-10-28 2014-02-05 程巧娜 Heat-resisting spraying material
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