CN113684333A - Blast furnace tapping channel current stabilizer and preparation method thereof - Google Patents
Blast furnace tapping channel current stabilizer and preparation method thereof Download PDFInfo
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- CN113684333A CN113684333A CN202110948351.5A CN202110948351A CN113684333A CN 113684333 A CN113684333 A CN 113684333A CN 202110948351 A CN202110948351 A CN 202110948351A CN 113684333 A CN113684333 A CN 113684333A
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B7/00—Blast furnaces
- C21B7/14—Discharging devices, e.g. for slag
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
- C04B35/10—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on aluminium oxide
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- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/622—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
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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
- C04B35/66—Monolithic refractories or refractory mortars, including those whether or not containing clay
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B7/00—Blast furnaces
- C21B7/04—Blast furnaces with special refractories
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- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
- C04B2235/34—Non-metal oxides, non-metal mixed oxides, or salts thereof that form the non-metal oxides upon heating, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
- C04B2235/3418—Silicon oxide, silicic acids, or oxide forming salts thereof, e.g. silica sol, fused silica, silica fume, cristobalite, quartz or flint
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- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
- C04B2235/38—Non-oxide ceramic constituents or additives
- C04B2235/3817—Carbides
- C04B2235/3826—Silicon carbides
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
- C04B2235/42—Non metallic elements added as constituents or additives, e.g. sulfur, phosphor, selenium or tellurium
- C04B2235/428—Silicon
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Abstract
The invention discloses a blast furnace tapping channel current stabilizer which comprises a current stabilizer body and a current stabilizer base, wherein the current stabilizer body is a sphere, the current stabilizer base is a block body, the top of the current stabilizer base is provided with a hemispheroid groove, the radius of the hemispheroid groove is larger than or equal to that of the current stabilizer body, the current stabilizer body is arranged in the hemispheroid groove, and the bottom of the current stabilizer base is poured in an impact area near a tapping point of a blast furnace tapping channel. The base of the current stabilizer has wide coverage, so that the coverage of the iron falling point is ensured; the current stabilizer body is a ball body, a certain gap is reserved between the current stabilizer body and the base, molten iron falling from the tap hole falls on the ball body, the ball body reduces the impact force of the molten iron through rotation in a certain range, the service life of an iron runner impact area is prolonged, a structure combining the current stabilizer body and the current stabilizer base is adopted, the current stabilizer is compared with the traditional furnace shutdown repair of the iron runner, and the production can be continued only by replacing the damaged current stabilizer body.
Description
Technical Field
The invention belongs to the field of ironmaking equipment, and particularly relates to a blast furnace tapping channel current stabilizer and a preparation method thereof.
Background
The blast furnace ironmaking output of China is the first world throughout the year, and the iron runner material as an unshaped refractory material for the blast furnace iron tapping runner accounts for more than 70 percent of the refractory material for the blast furnace stokehole. With the development trend of long service life and large-scale of the modern blast furnace technology, the use conditions of the refractory material for the blast furnace tapping channel become more severe. The impact area of the blast furnace main runner iron falling point accessory is frequently impacted by molten iron, and the molten iron is extremely complex to move in the impact area, so that the impact area of the tapping runner is the weakest link of the main runner, and the main runner is generally maintained integrally due to the serious damage of the impact area. The short service life of the impact area of the iron runner can lead to high maintenance frequency of the iron runner and influence the production efficiency of the blast furnace.
Al2O3the-SiC-C castable is widely applied to the refractory material of the working layer of the large and medium blast furnace tapping channel due to the excellent thermal shock resistance stability and erosion resistance, and the quality of the-SiC-C castable is mainly expressed in the service life. At present, cement-bonded Al is almost adopted at home and abroad2O3-SiC-C iron runner casting material, but Ca in cement+The low-melting substances such as anorthite, gehlenite and the like are generated at high temperature, so that the high-temperature performance is reduced, and the service life of the iron runner castable is seriously influenced. In order to achieve the purpose of cement-free iron runner castable, a silica micro powder bonding system or a silica sol bonding system is generally adopted, however, silica sol bonding and micro powder bonding have the defects that the early strength is low and the like cannot be overcome, and the using effect of the silica sol bonding and micro powder bonding has no advantages compared with that of cement-bonded iron runner castable.
Disclosure of Invention
The invention aims to provide a blast furnace tapping channel current stabilizer with simple structure, convenient maintenance and replacement and long service life and a preparation method thereof.
In order to solve the technical problems, the technical scheme of the invention is as follows: the utility model provides a blast furnace tapping runner current regulator, includes current regulator body and current regulator base, the current regulator body is the spheroid, the current regulator base is the block, the hemisphere recess is seted up at current regulator base top, hemisphere recess radius is more than or equal to current regulator body radius, the current regulator body sets up in the hemisphere recess, current regulator base bottom pouring is in the impact zone near blast furnace tapping runner iron falling point.
The current stabilizer body comprises the following components in parts by mass: 55-65 parts of compact corundum aggregate, 15-20 parts of silicon carbide powder, 3-5 parts of ball asphalt and alpha-Al2O35-10 parts of micro powder, 1-3 parts of metal silicon powder, 7-9 parts of compact corundum powder and 6-8 parts of silica sol.
The compact corundum aggregate comprises the following components in percentage by weight: al (Al)2O397.68-98.32% of SiO2Less than 1% of Fe2O3The content is less than 0.15 percent.
The compact corundum aggregate has the granularity of 0.076-8 mm, wherein the weight percentage of compact corundum particles with various granularities is as follows: the content of compact corundum particles with the particle size of 5-8 mm is 26-38%, the content of compact corundum particles with the particle size of 3-5 mm is 20-24%, the content of compact corundum particles with the particle size of 1-3 mm is 28-32%, and the content of compact corundum particles with the particle size of 0.076-1 mm is 14-18%; the density of the dense corundum particles is 3.78-3.85 g/cm3。
The particle size of the compact corundum powder is less than or equal to 0.076 mm.
The granularity of the silicon carbide powder is 0.02-1 mm, wherein the weight percentage of the silicon carbide is more than or equal to 98%.
The silica sol is JN-40 type silica sol, wherein SiO2Is greater than or equal to 40% by weight, R2The weight percentage of O is less than or equal to 0.4%.
The alpha-Al2O3The particle size of the micro powder is less than or equal to 0.044mm, and the alpha-Al2O3Al in micro powder2O3The weight percentage of (A) is greater than or equal to 98%.
The granularity of the metal silicon powder is less than or equal to 45 mu m, wherein the weight percentage of silicon is more than 98%.
Also provides a preparation method of the blast furnace tapping channel current stabilizer, which comprises the following steps:
mixing the following components in percentage by mass: 55-65 parts of compact corundum aggregate, 15-20 parts of silicon carbide powder, 3-5 parts of ball asphalt and alpha-Al2O35-10 parts of micro powder, 1-3 parts of metal silicon powder, 7-9 parts of compact corundum powder and 6-8 parts of silica sol;
weighing and stirring the mixture, and pressing the mixture into a sphere by a semi-dry method;
drying with a tunnel dryer;
calcining the mixture in a tunnel kiln to obtain a current stabilizer body;
and pouring to obtain the base of the current stabilizer.
Compared with the prior art, the invention has the beneficial effects that:
1. the base of the current stabilizer has wide coverage, so that the coverage of the iron falling point is ensured; the current stabilizer body is a sphere, a certain gap is reserved between the current stabilizer body and the base, molten iron falling from the tap hole falls on the sphere current stabilizer body, and the sphere current stabilizer body reduces the impact force of the molten iron through rotation of a certain range to prolong the service life of an iron runner impact area.
2. Compared with the traditional furnace shutdown repair of the iron runner, the invention adopts the structure that the current stabilizer body is combined with the current stabilizer base, and can continue the production by only replacing the damaged current stabilizer body without damping down of the blast furnace caused by occupying the normal time of the iron-making blast furnace due to the maintenance of the iron runner.
3. According to the invention, silica sol is used as a refractory material binder of the current stabilizer body, and compared with the existing traditional iron runner castable material adopting calcium aluminate cement for binding, no Ca2+ is introduced to cause the reduction of the high-temperature performance of the material; meanwhile, the semi-dry pressing method is adopted for preparing samples, and the samples are calcined in a tunnel kiln, so that the defect of low early strength of the silica sol combined refractory material is overcome. The calcined material has good physical and chemical properties.
Drawings
FIG. 1 is a front view of an embodiment of the present invention;
FIG. 2 is a top view of an embodiment of the present invention;
FIG. 3 is a schematic illustration of an installation of an embodiment of the present invention;
in the figure, 1-the current stabilizer body, 2-the current stabilizer base.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The technical scheme of the embodiment of the invention is as follows: a blast furnace iron tapping channel current stabilizer is shown in figures 1-3, and the device is arranged in an impact area near an iron falling point of a blast furnace iron tapping channel and comprises a current stabilizer base 2 and a current stabilizer body 1. The current stabilizer body 1 is a sphere, the current stabilizer base 2 is a cuboid, a hemisphere groove is formed in the surface of the base, and the depth of the hemisphere groove is close to the radius of the current stabilizer body 1.
The flow stabilizer base 2 is integrally cast by a corundum-mullite refractory material. The bottom of the flow stabilizer base 2 is poured in an impact area near the iron falling point of the blast furnace iron tapping channel.
The current stabilizer body 1 comprises the following components in parts by mass: compact corundum aggregate: 55-65 parts of silicon carbide powder: 15-20 parts of ball asphalt: 3 to 5 parts of alpha-Al2O3Micro-powder: 5-10 parts of metal silicon powder: 1-3 parts of compact corundum powder: 7-9 parts of silica sol, and 6-8 parts of silica sol.
The flow stabilizer body 1 is weighed according to the mass ratio of the components, stirred and then pressed into a sphere by a semi-dry method, and the sphere is dried with a tunnel dryer. And finally, calcining the mixture in a tunnel kiln to obtain the current stabilizer body 1.
Compact corundum for the current stabilizer body 1The aggregate granularity is 0.076-8 mm, the content of the compact corundum particles is 26-38 wt% in 5-8 mm, the content of the compact corundum particles is 20-24 wt% in 3-5 mm, the content of the compact corundum particles is 28-32 wt% in 1-3 mm, and the content of the compact corundum particles is 14-18 wt% in 0.076-1 mm; the main chemical components of the compact corundum are as follows: al (Al)2O397.68-98.32 wt% of SiO2Content < 1 wt%, Fe2O3The content is less than 0.15 wt%; the density of the dense corundum particles is 3.78-3.85 g/cm3。
The particle size of the compact corundum fine powder is less than or equal to 0.076mm, and the compact corundum comprises the following main chemical components: al (Al)2O397.68-98.32 wt% of SiO2Content < 1 wt%, Fe2O3The content is less than 0.15 wt%.
The granularity of the silicon carbide is 0.02-1 mm, and the SiC content is more than or equal to 98 wt%.
The silica sol is JN-40 type silica sol; the silica sol meets the following requirements: SiO 22Content is not less than 40 wt%, R2O≤0.4wt％。
The alpha-Al2O3The granularity of the micro powder is less than or equal to 0.044 mm; the alpha-Al2O3Micronized Al2O3Content (wt.)
≥98wt％。
The granularity of the metal silicon powder is less than or equal to 45 mu m, and the Si content is more than 98 wt%.
Compared with the prior art, the concrete implementation mode has the positive effects that:
1. in the specific embodiment, the coverage of the base 2 of the current stabilizer is wide, so that the coverage of the iron falling point is ensured; the current stabilizer body 1 is a sphere, a certain gap is reserved between the current stabilizer body 1 and the current stabilizer base 2, molten iron falling from a tap hole falls on the sphere current stabilizer body 1, and the sphere current stabilizer body 1 reduces the impact force of the molten iron through rotation of a certain range, so that the service life of an iron runner impact area is prolonged.
2. This embodiment adopts the structure that current regulator body 1 and current regulator base 2 combined together, compares with the traditional blowing out of the furnace of iron runner is repaired, only need to change the current regulator body 1 that damages can continue to produce and can not appear because the maintenance tapping channel occupies the normal time of ironmaking blast furnace and leads to the blowing down of blast furnace.
3. In the embodiment, silica sol is used as the refractory material bonding agent of the current stabilizer body 1, and compared with the existing traditional iron runner castable adopting calcium aluminate cement for bonding, no Ca is generated2+The introduction of (a) results in a reduction in the high temperature properties of the material; meanwhile, the semi-dry pressing method is adopted for preparing samples, and the samples are calcined in a tunnel kiln, so that the defect of low early strength of the silica sol combined refractory material is overcome. The calcined material has good physical and chemical properties.
The above description is a preferred embodiment of the intellectual development, but the intellectual development should not be limited to the disclosure of the embodiment and the drawings. Therefore, all equivalents and modifications which come within the spirit of the disclosure are desired to be protected.
Claims (10)
1. The utility model provides a blast furnace tapping channel current regulator, its characterized in that includes current regulator body and current regulator base, the current regulator body is the spheroid, the current regulator base is the block, the hemisphere recess is seted up at current regulator base top, hemisphere recess radius is more than or equal to current regulator body radius, the current regulator body sets up in the hemisphere recess.
2. The blast furnace tapping channel current stabilizer according to claim 1, wherein the current stabilizer body comprises the following components in parts by mass: 55-65 parts of compact corundum aggregate, 15-20 parts of silicon carbide powder, 3-5 parts of ball asphalt and alpha-Al2O35-10 parts of micro powder, 1-3 parts of metal silicon powder, 7-9 parts of compact corundum powder and 6-8 parts of silica sol.
3. The blast furnace tapping runner current stabilizer according to claim 2, wherein the weight percentage of each component in the dense corundum aggregate is as follows: al (Al)2O397.68-98.32% of SiO2Less than 1% of Fe2O3The content is less than 0.15 percent.
4. The blast furnace tapping channel current stabilizer according to claim 2, wherein the compact corundum aggregate has a particle size of 0.076-8 mm, wherein the weight percentage of each particle size of compact corundum particles is as follows: the content of compact corundum particles with the particle size of 5-8 mm is 26-38%, the content of compact corundum particles with the particle size of 3-5 mm is 20-24%, the content of compact corundum particles with the particle size of 1-3 mm is 28-32%, and the content of compact corundum particles with the particle size of 0.076-1 mm is 14-18%; the density of the dense corundum particles is 3.78-3.85 g/cm3。
5. The blast furnace tapping runner current stabilizer according to claim 2, wherein the compact corundum powder has a particle size of 0.076mm or less.
6. The blast furnace tapping channel current stabilizer according to claim 2, wherein the silicon carbide powder has a particle size of 0.02-1 mm, wherein the weight percentage of silicon carbide is greater than or equal to 98%.
7. The blast furnace tapping runner current stabilizer according to claim 2, wherein the silica sol is JN-40 type silica sol, wherein SiO is2Is greater than or equal to 40% by weight, R2The weight percentage of O is less than or equal to 0.4%.
8. The blast furnace tapping runner current stabilizer according to claim 2, wherein the α -Al is2O3The particle size of the micro powder is less than or equal to 0.044mm, and the alpha-Al2O3Al in micro powder2O3The weight percentage of (A) is greater than or equal to 98%.
9. The blast furnace tapping channel current stabilizer according to claim 2, wherein the particle size of the metal silicon powder is less than or equal to 45 μm, and the weight percentage of silicon is more than 98%.
10. The preparation method of the blast furnace tapping channel current stabilizer according to claim 1, characterized by comprising the following steps:
mixing the following components in percentage by mass: 55-65 parts of compact corundum aggregate, 15-20 parts of silicon carbide powder, 3-5 parts of ball asphalt and alpha-Al2O35-10 parts of micro powder, 1-3 parts of metal silicon powder, 7-9 parts of compact corundum powder and 6-8 parts of silica sol;
weighing and stirring the mixture, and pressing the mixture into a sphere by a semi-dry method;
drying with a tunnel dryer;
calcining the mixture in a tunnel kiln to obtain a current stabilizer body;
and pouring to obtain the base of the current stabilizer.
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| CN107226687A (en) * | 2016-03-23 | 2017-10-03 | 上海宝钢工业技术服务有限公司 | Castable for blast furnace lining spray repair and preparation method thereof |
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2021
- 2021-08-18 CN CN202110948351.5A patent/CN113684333B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2007217737A (en) * | 2006-02-15 | 2007-08-30 | Jfe Steel Kk | Apparatus for desiliconizing molten pig iron, and tilting trough for desiliconizing molten pig iron |
| CN102557697A (en) * | 2012-03-15 | 2012-07-11 | 长兴明天炉料有限公司 | Pouring material and single-iron notch blast furnace iron storage type tapping main channel using same |
| CN107226687A (en) * | 2016-03-23 | 2017-10-03 | 上海宝钢工业技术服务有限公司 | Castable for blast furnace lining spray repair and preparation method thereof |
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