CN111889663A - Composite dispersed air brick and preparation method thereof - Google Patents
Composite dispersed air brick and preparation method thereof Download PDFInfo
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- CN111889663A CN111889663A CN202010674354.XA CN202010674354A CN111889663A CN 111889663 A CN111889663 A CN 111889663A CN 202010674354 A CN202010674354 A CN 202010674354A CN 111889663 A CN111889663 A CN 111889663A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D41/00—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like
- B22D41/50—Pouring-nozzles
- B22D41/58—Pouring-nozzles with gas injecting means
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D41/00—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like
- B22D41/02—Linings
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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
- C04B35/101—Refractories from grain sized mixtures
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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
- C04B35/101—Refractories from grain sized mixtures
- C04B35/105—Refractories from grain sized mixtures containing chromium oxide or chrome ore
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/072—Treatment with gases
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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
- C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
- C04B2235/3217—Aluminum oxide or oxide forming salts thereof, e.g. bauxite, alpha-alumina
- C04B2235/3222—Aluminates other than alumino-silicates, e.g. spinel (MgAl2O4)
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- Materials Engineering (AREA)
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- Mechanical Engineering (AREA)
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- Carbon Steel Or Casting Steel Manufacturing (AREA)
Abstract
The invention discloses a composite dispersive air brick and a preparation method thereof, relating to the technical field of steel smelting.A central dispersive air permeable body is positioned in the center, an external slit air permeable body is positioned at the periphery of the central dispersive air permeable body, a first pouring layer is arranged between the central dispersive air permeable body and the external slit air permeable body, a second pouring layer is arranged between the external slit air permeable body and a metal shell, a bottom air chamber is arranged below the central dispersive air permeable body and the external slit air permeable body, the apparent porosity of the central dispersive air permeable body is 25-32%, and the normal temperature compressive strength is 100-150 MPa; the safety mark is arranged at the center of the bottom of the central dispersive air-permeable body and is made of corundum material. Argon is blown in to form micro bubbles, so that floating of non-metallic inclusions is facilitated, and the aim of improving the cleanliness of molten steel is fulfilled; meanwhile, the safety use performance of the air brick is improved while the long service life is ensured and the production is promoted, so that the composite type dispersion air brick is produced.
Description
Technical Field
The invention relates to the technical field of steel smelting, in particular to a composite dispersive air brick and a preparation method thereof.
Background
The air brick is used as an important air supply element in the ferrous metallurgy process, plays a vital role in the production of high-quality and clean steel, removes impurities by blowing inert gases such as argon and the like to stir molten steel, enables the temperature and the components of the molten steel to be uniform, and finally achieves the purpose of optimizing the quality of steel.
The composite dispersive air brick with the patent publication number of CN 106468086A and the preparation method thereof, and the composite dispersive air brick with the large air flow with the patent publication number of CN205057030U have the characteristics of long service life, large air flow and high air flow rate. In the current practical application, the dispersion air brick is not generally popularized in ferrous metallurgy, and the main reason is that the air permeability is not stable enough, and the air permeability is not enough to completely meet the refining requirement. The slit type composite air brick with the patent publication number of CN201165535Y adopts a mode of compounding an air permeable ceramic rod and a slit, and the prepared novel slit type composite air brick is large in air permeability, easy to control air flow and long in service life. However, the preparation of the ceramic tube which can exist stably at high temperature is relatively complex and has high cost, and secondly, most ceramic tubes are in a slit ventilation mode, and the ventilation amount is large and concentrated.
In modern steel-making production, the requirements for quality steel and clean steel are higher and higher, the requirements are gradually increased, and the requirements for breathable refining elements are higher and higher. Meanwhile, the increase of labor difficulty also puts forward higher requirements on the blowback and sweeping easiness of the air permeable element, which promotes the development of the air permeable brick towards the direction of less sweeping, large air permeability and long service life.
Disclosure of Invention
Aiming at the technical problems, the invention overcomes the defects of the prior art and provides a composite type dispersive air brick which has large ventilation volume and less purging and is beneficial to the dispersion of refining required airflow.
In order to solve the technical problems, the invention provides a composite dispersive air brick, which comprises a central dispersive air permeable body, an external slit air permeable body, a bottom air chamber and an air blowing pipe, the metal casing, the apron, the safety sign, the gas is passed through to central diffuse formula, the gas is passed through to the outside slot formula all is located the inside of metal casing, the gas is passed through to the central diffuse formula is located the positive center, outside slot formula breathing position is located central diffuse formula and is passed through the gas periphery, be equipped with pouring layer one between the gas is passed through to the central diffuse formula and the gas is passed through to the outside slot formula, be equipped with pouring layer two between gas and the metal casing to the outside slot formula, the bottom air chamber is located central diffuse formula and is passed through to the gas and outside slot formula below, the apron is located bottom air chamber below and seals the metal casing, the gas blow pipe is located on the apron, the apparent porosity of central diffuse formula gas that passes through is 25% -32%, the normal atmospheric temperature compressive strength is 100-; the safety mark is arranged at the center of the bottom of the central dispersive air-permeable body and is made of corundum material.
The technical effects are as follows: according to the invention, the dispersed air brick is used for blowing argon to form micro bubbles, so that the floating of non-metallic inclusions is facilitated, and the purpose of improving the cleanliness of molten steel is achieved; meanwhile, the slit type air brick has the advantages of long service life and large air permeability, the safety use performance of the air brick is improved while the long service life is ensured and the production is promoted, and the composite type dispersion air brick is produced.
The technical scheme of the invention is further defined as follows:
the composite dispersive air brick has the external slit type air permeable slits with the width of 0.10-0.25mm, the length of 20-30mm and the number of 20-30.
The diameter of the safety mark is 15mm, and the volume density is 3.0-3.3g/cm3The apparent porosity is less than 10%.
The composite diffused air brick is characterized in that the center diffused air permeable body is in a circular truncated cone shape and is small in the upper part and large in the lower part, and the outer slit type air permeable body is in an annular body and is small in the upper part and large in the lower part.
The invention also aims to provide a preparation method of the composite dispersive air brick, which comprises the following steps:
step 1: the preparation method comprises the steps of uniformly mixing the components with special particle size fractions, carrying out isostatic pressing, and carrying out high-temperature sintering at 1650-1750 ℃ for 16 hours to obtain central dispersed permeable gas;
step 2: mixing corundum material, alumina fine powder and pure calcium aluminate cement, then carrying out vibration casting molding, demoulding, curing and drying, and then carrying out 1550-;
and step 3: bonding the central diffuse type gas permeable body, the external slit type gas permeable body and the safety mark into a whole by using corundum fire clay, naturally curing for 24 hours, drying for 24 hours in a drying kiln at 200 ℃, then combining with a bottom air chamber, simply assembling the components together with a stainless steel metal shell after combination and buckling, and pouring and filling the corundum castable material to obtain a pouring layer I and a pouring layer II after baking-free molding;
and after curing, drying and baking, welding the cover plate and the gas blowing pipe to obtain the composite diffuse air brick.
In the preparation method of the composite dispersive air brick, the special grain size composition in the step 1 comprises a chromium corundum material with the grain size of 0.15-1 mm.
The preparation method of the composite dispersive air brick comprises the following concrete steps of isostatic compaction in the step 1: the isostatic compaction pressure is 150-200MPa, and the dwell time is 60-120 seconds.
In the preparation method of the composite dispersive air brick, the corundum material adopts plate-shaped corundum or electric melting white corundum aggregate.
In the preparation method of the composite dispersive air brick, the heat treatment in the step 2 is specifically to place the dried external slit type permeable gas (3) into a high temperature kiln, and fire the gas at the high temperature of 1550-.
The invention has the beneficial effects that:
(1) the dispersoid adopted in the invention has high strength and high apparent porosity, the gas flow is dispersed and flowed out by the dispersoid, the function of micro bubbles dispersed by the dispersive air brick in molten steel refining is fully utilized, and the gas flow dispersing effect is better than that of singly adopting the slit air brick;
(2) the dispersed air brick is made of a chromium corundum material which is produced by a formula with strong thermal shock resistance and strong scouring resistance, so that the purging frequency is greatly reduced, and the purging rate of the air brick is improved;
(3) the safety mark made of the compact corundum block adopted by the invention can serve as a warning mark in the steelmaking process because the brightness color or the shape of the safety mark is different from the surrounding color or the shape of the safety mark in the high-temperature or oxygen burning blowing process, thereby providing convenience for the safe use of the air brick;
(4) the composite dispersive air brick is matched with the one-way air stop valve and the air chamber which are arranged on the gas pipeline at the bottom of the ladle, so that the probability of slit steel infiltration of the air brick in the process of stopping blowing gas is reduced, the blowing air brick can be greatly reduced, and the service life of the air brick is indirectly prolonged;
(5) the ventilation body structure and the material are matched, so that the purposes of large gas flow, less purging and long service life are achieved.
Drawings
FIG. 1 is a schematic cross-sectional view of the present invention;
wherein: 1. a bottom air chamber; 2. a central diffusive gas permeable; 3. an external slit type gas permeable body; 4. a security identification; 5. pouring a layer I; 6. a second pouring layer; 7. a metal housing; 8. an air blowing pipe; 9. and (7) a cover plate.
Detailed Description
Example 1
The composite dispersive air brick provided by the embodiment has a structure as shown in fig. 1, and comprises a central dispersive air permeable body 2, an external slit air permeable body 3, a bottom air chamber 1, an air blowing pipe 8, a metal shell 7, a cover plate 9 and a safety mark 4.
The central dispersive gas permeable body 2 and the external slit gas permeable body 3 are both arranged in the metal shell 7, the central dispersive gas permeable body 2 is positioned in the center, the external slit gas permeable body 3 is positioned on the periphery of the central dispersive gas permeable body 2, the central dispersive gas permeable body 2 is in a circular truncated cone shape and is large in the upper part and small in the lower part, the external slit gas permeable body 3 is in an annular body shape and is large in the upper part and small in the lower part, the slit width is 0.20mm, the length is 22mm, and the number of the slits is 20. A first pouring layer 5 is arranged between the central dispersed gas permeable body 2 and the external slit gas permeable body 3, a second pouring layer 6 is arranged between the external slit gas permeable body 3 and the metal shell 7, the bottom gas chamber 1 is arranged below the central dispersed gas permeable body 2 and the external slit gas permeable body 3, the cover plate 9 is arranged below the bottom gas chamber 1 and seals the metal shell 7, and the gas blow pipe 8 is arranged on the cover plate 9.
The central dispersive gas permeable body 2 is mainly made of chrome corundum material with the thickness of 0.15-1mm, the apparent porosity is 25% -32%, and the normal-temperature compressive strength is 100-150 MPa; the safety mark 4 is arranged at the center of the bottom of the central dispersive gas permeable body 2 and is made of corundum material, the diameter is 15mm, and the volume density is 3.0-3.3g/cm3The apparent porosity is less than 10%.
The preparation method of the air brick comprises the following steps:
step 1: 80-90 wt% of 1.0-0.2 mm-granularity plate corundum, 10-20wt% of 325-mesh fused white corundum fine powder, activated alumina and chromium oxide micro powder and 4-6wt% of phenolic resin are adopted, mixed and granulated, then isostatic pressing is carried out, the isostatic pressing pressure is 150-200MPa, the pressure maintaining time is 60-120 seconds, and finally, the central dispersed permeable gas 2 is obtained by high-temperature sintering at 1650-1750 ℃ for 16 hours;
step 2: carrying out layout production by pre-inserting high-temperature sintering lost objects, arranging a circular air chamber at a large-head part, mixing plate-shaped corundum or electric-melting white corundum aggregate, alumina fine powder and pure calcium aluminate cement, then carrying out vibration casting molding, demoulding, curing and drying, and then carrying out high-temperature sintering at 1550 ℃ and 1630 ℃, wherein the high-temperature sintering time is not less than 10 hours, and the total sintering time is not less than 48 hours, so as to obtain an external slit type permeable gas 3;
and step 3: bonding the central diffuse type permeable gas 2, the external slit type permeable gas 3 and the safety mark 4 into a whole by using corundum fire clay, naturally curing for 24 hours, drying in a drying kiln at 200 ℃ for 24 hours, combining with the bottom air chamber 1, combining and buckling, simply assembling the components together with a stainless steel metal shell 7, and pouring and filling corundum castable to obtain a first pouring layer 5 and a second pouring layer 6 after baking-free molding;
after curing, drying and baking, the cover plate 9 and the air blowing pipe 8 are welded to obtain the composite diffuse air brick.
Example 2
The present embodiment provides a composite type diffused air brick, which is different from embodiment 1 in that the width of the slit is 0.25mm, the length is 20mm, and the number of the slits is 18.
Example 3
The present embodiment provides a composite type diffused air brick, which is different from embodiment 1 in that the width of the slit is 0.18mm, the length is 30mm, and the number of the slits is 24.
Above-mentioned scheme design is through reasonable mould design, has solved traditional diffuse formula air brick intensity low, gas flow is little, the problem of intolerance to erode, can adjust the combination according to demand and purpose to arranging of the ventilative slit of the ventilative 3 of outside slit formula to reach the air output of ideal.
In addition to the above embodiments, the present invention may have other embodiments. All technical solutions formed by adopting equivalent substitutions or equivalent transformations fall within the protection scope of the claims of the present invention.
Claims (9)
1. A composite dispersive air brick comprises a central dispersive permeable gas (2), an external slit permeable gas (3), a bottom air chamber (1), an air blowing pipe (8), a metal shell (7), a cover plate (9) and a safety mark (4), wherein the central dispersive permeable gas (2) and the external slit permeable gas (3) are arranged in the metal shell (7), the central dispersive permeable gas (2) is positioned in the center, the external slit permeable gas (3) is positioned on the periphery of the central dispersive permeable gas (2), a first pouring layer (5) is arranged between the central dispersive permeable gas (2) and the external slit permeable gas (3), a second pouring layer (6) is arranged between the external slit permeable gas (3) and the metal shell (7), the bottom air chamber (1) is arranged below the central dispersive permeable gas (2) and the external slit permeable gas (3), apron (9) are located bottom air chamber (1) below and seal metal casing (7), gas blow pipe (8) are located on apron (9), its characterized in that: the apparent porosity of the central dispersed permeable gas (2) is 25-32%, and the normal-temperature compressive strength is 100-150 MPa; the safety mark (4) is arranged at the center of the bottom of the central dispersive gas permeable body (2) and is made of corundum materials.
2. The composite dispersive air brick according to claim 1, characterized in that: the width of the slit of the external slit type gas permeable body (3) is 0.10-0.25mm, the length is 20-30mm, and the number of the slits is 20-30.
3. The composite dispersive air brick according to claim 1, characterized in that: the diameter of the safety mark (4) is 15mm, and the volume density is 3.0-3.3g/cm3The apparent porosity is less than 10%.
4. The composite dispersive air brick according to claim 1, characterized in that: the central diffuse type permeable gas (2) is in a circular truncated cone shape and is small in the top and large in the bottom, and the external slit type permeable gas (3) is in an annular body and is small in the top and large in the bottom.
5. A preparation method of a composite dispersive air brick is characterized by comprising the following steps: the method is used for preparing the composite type diffused air brick of any one of claims 1 to 3, and comprises the following steps:
step 1: adopting special size fraction composition, evenly mixing, performing isostatic pressing, and sintering at 1650-1750 ℃ for 16 hours to obtain the central dispersed permeable gas (2);
step 2: mixing corundum material, alumina fine powder and pure calcium aluminate cement, then carrying out vibration casting molding, demoulding, curing and drying, and then carrying out high-temperature heat treatment at 1550-;
and step 3: bonding the central diffuse type permeable gas (2), the external slit type permeable gas (3) and the safety mark (4) into a whole by corundum fire clay, naturally curing for 24 hours, drying in a drying kiln at 200 ℃ for 24 hours, then combining with the bottom air chamber (1), simply assembling the combined and pressed metal shell (7) made of stainless steel, and pouring and filling corundum castable to obtain the first pouring layer (5) and the second pouring layer (6) without baking and forming;
and after curing, drying and baking, welding the cover plate (9) and the air blowing pipe (8) to obtain the composite diffuse type air brick.
6. The preparation method of the composite dispersive air brick according to claim 4, characterized in that: the special size fraction in the step 1 comprises a chromium corundum material with the thickness of 0.15-1 mm.
7. The preparation method of the composite dispersive air brick according to claim 4, characterized in that: the isostatic pressing in the step 1 specifically comprises the following steps: the isostatic compaction pressure is 150-200MPa, and the dwell time is 60-120 seconds.
8. The preparation method of the composite dispersive air brick according to claim 4, characterized in that: the corundum material in the step 2 is plate-shaped corundum or electric melting white corundum aggregate.
9. The preparation method of the composite dispersive air brick according to claim 4, characterized in that: the heat treatment in the step 2 is specifically to load the dried external slit type permeable gas (3) into a high-temperature kiln, and to sinter the gas at the high temperature of 1550-.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113118428A (en) * | 2021-04-28 | 2021-07-16 | 山东钢铁股份有限公司 | Dispersion type integral ladle bottom blowing air brick and forming process and application method thereof |
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Application publication date: 20201106 |