CN112250453A - Dry material for continuous casting tundish working lining, construction process and continuous casting tundish working lining - Google Patents
Dry material for continuous casting tundish working lining, construction process and continuous casting tundish working lining Download PDFInfo
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- CN112250453A CN112250453A CN202011129996.8A CN202011129996A CN112250453A CN 112250453 A CN112250453 A CN 112250453A CN 202011129996 A CN202011129996 A CN 202011129996A CN 112250453 A CN112250453 A CN 112250453A
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- 239000000463 material Substances 0.000 title claims abstract description 84
- 238000009749 continuous casting Methods 0.000 title claims abstract description 42
- 238000000034 method Methods 0.000 title claims description 37
- 230000008569 process Effects 0.000 title claims description 32
- 238000010276 construction Methods 0.000 title claims description 15
- 239000001095 magnesium carbonate Substances 0.000 claims abstract description 73
- 235000014380 magnesium carbonate Nutrition 0.000 claims abstract description 73
- ZLNQQNXFFQJAID-UHFFFAOYSA-L magnesium carbonate Chemical compound [Mg+2].[O-]C([O-])=O ZLNQQNXFFQJAID-UHFFFAOYSA-L 0.000 claims abstract description 73
- 229910000021 magnesium carbonate Inorganic materials 0.000 claims abstract description 73
- 239000011230 binding agent Substances 0.000 claims abstract description 22
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 17
- 239000010959 steel Substances 0.000 claims abstract description 17
- CPLXHLVBOLITMK-UHFFFAOYSA-N Magnesium oxide Chemical compound [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 claims description 24
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 13
- 239000000843 powder Substances 0.000 claims description 13
- 239000000395 magnesium oxide Substances 0.000 claims description 12
- 238000003756 stirring Methods 0.000 claims description 11
- 239000002245 particle Substances 0.000 claims description 9
- 239000004115 Sodium Silicate Substances 0.000 claims description 8
- 229910052911 sodium silicate Inorganic materials 0.000 claims description 8
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 claims description 8
- 238000005245 sintering Methods 0.000 claims description 7
- 238000005266 casting Methods 0.000 claims description 4
- 238000009499 grossing Methods 0.000 claims description 4
- 238000003825 pressing Methods 0.000 claims description 4
- 239000000440 bentonite Substances 0.000 claims description 3
- 229910000278 bentonite Inorganic materials 0.000 claims description 3
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 claims description 3
- 239000004927 clay Substances 0.000 claims description 3
- 230000001105 regulatory effect Effects 0.000 claims description 3
- 239000004576 sand Substances 0.000 claims description 3
- 235000019795 sodium metasilicate Nutrition 0.000 claims description 3
- 238000001816 cooling Methods 0.000 claims description 2
- 229910021487 silica fume Inorganic materials 0.000 claims description 2
- 239000007767 bonding agent Substances 0.000 abstract description 10
- 239000007788 liquid Substances 0.000 abstract description 5
- 239000002893 slag Substances 0.000 abstract description 5
- 229910052739 hydrogen Inorganic materials 0.000 abstract description 4
- 239000001257 hydrogen Substances 0.000 abstract description 4
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 abstract description 3
- 230000003628 erosive effect Effects 0.000 abstract description 2
- 239000000654 additive Substances 0.000 description 9
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- 229910052799 carbon Inorganic materials 0.000 description 7
- 238000002360 preparation method Methods 0.000 description 5
- 239000000377 silicon dioxide Substances 0.000 description 5
- 229910052681 coesite Inorganic materials 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 4
- 229910052906 cristobalite Inorganic materials 0.000 description 4
- 239000011734 sodium Substances 0.000 description 4
- 229910052682 stishovite Inorganic materials 0.000 description 4
- 229910052905 tridymite Inorganic materials 0.000 description 4
- UHOVQNZJYSORNB-UHFFFAOYSA-N Benzene Chemical compound C1=CC=CC=C1 UHOVQNZJYSORNB-UHFFFAOYSA-N 0.000 description 3
- 230000007797 corrosion Effects 0.000 description 3
- 238000005260 corrosion Methods 0.000 description 3
- 239000010410 layer Substances 0.000 description 3
- 239000010450 olivine Substances 0.000 description 3
- 229910052609 olivine Inorganic materials 0.000 description 3
- KXGFMDJXCMQABM-UHFFFAOYSA-N 2-methoxy-6-methylphenol Chemical compound [CH]OC1=CC=CC([CH])=C1O KXGFMDJXCMQABM-UHFFFAOYSA-N 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
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- 230000006872 improvement Effects 0.000 description 2
- YOBAEOGBNPPUQV-UHFFFAOYSA-N iron;trihydrate Chemical compound O.O.O.[Fe].[Fe] YOBAEOGBNPPUQV-UHFFFAOYSA-N 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 239000005011 phenolic resin Substances 0.000 description 2
- 229920001568 phenolic resin Polymers 0.000 description 2
- 239000002344 surface layer Substances 0.000 description 2
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
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- 239000007789 gas Substances 0.000 description 1
- 150000002431 hydrogen Chemical class 0.000 description 1
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- 239000011819 refractory material Substances 0.000 description 1
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Images
Classifications
-
- 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
-
- 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
- B22D41/023—Apparatus used for making or repairing linings
-
- 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
- C04B35/03—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 magnesium oxide, calcium oxide or oxide mixtures derived from dolomite
- C04B35/04—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 magnesium oxide, calcium oxide or oxide mixtures derived from dolomite based on magnesium oxide
- C04B35/043—Refractories from grain sized mixtures
-
- 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
- C04B2235/34—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
-
- 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
- C04B2235/34—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
- C04B2235/3427—Silicates other than clay, e.g. water glass
-
- 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
- C04B2235/34—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
- C04B2235/349—Clays, e.g. bentonites, smectites such as montmorillonite, vermiculites or kaolines, e.g. illite, talc or sepiolite
Abstract
The invention discloses a dry material for a continuous casting tundish working lining, which is prepared by 90-time sintered magnesite, 93-time sintered magnesite and an inorganic bonding agent according to a certain proportion. The dry material does not contain organic binding agent, does not pollute molten steel, reduces the hydrogen increasing element of the molten steel to zero and increases, the continuous casting tundish working lining prepared by the dry material can resist the slag liquid erosion, and the number of the poured heavy rail steel can reach at least 20.
Description
Technical Field
The invention relates to the field of refractory materials, in particular to a dry material for a continuous casting tundish working lining, a construction process and the continuous casting tundish working lining.
Background
The existing working lining material mostly adopts thermoplastic dry powder resin as a bonding agent, contains various harmful gases, such as ammonia gas, benzene and other volatile matters, pollutes the environment and harms the body health of operators, and can also generate the functions of carburetion and hydrogen increasing and reduce the quality of molten steel. The working lining material is in need of further improvement.
Disclosure of Invention
The present invention is directed to solving at least one of the problems of the prior art. Therefore, the invention aims to provide a dry material for a continuous casting tundish working lining, a continuous casting tundish working lining construction process and the continuous casting tundish working lining, wherein the dry material does not contain any organic binding agent, does not pollute molten steel, reduces the hydrogen increasing element of the molten steel to zero and increases, the continuous casting tundish working lining prepared by the dry material can resist the slag liquid corrosion, and the number of the poured heavy rail steel furnaces can reach at least 20.
The invention discloses a dry material for a continuous casting tundish working lining, which is prepared from 90 parts by weight of dead burnt magnesite, 93 parts by weight of sintered magnesite and an inorganic bonding agent in the following weight parts:
31-64 parts of 90-reburning beautifying sand
93 portions of sintered magnesia 19 to 50 portions
7-10 parts of inorganic binder
In some embodiments, the dry material further comprises 95 medium magnesite and is prepared according to the following weight parts:
9-15 parts of 95 medium magnesite
In some embodiments, the dry material is prepared according to the following weight part ratio and grading:
in some embodiments, the 95 medium magnesite clinker is prepared by the following weight parts and grades:
9-15 parts of 95 medium magnesite with granularity of 0-200 meshes
In some embodiments, the inorganic binder is at least one of sodium metasilicate, hydrous sodium silicate, microsilica, bentonite, and/or clay.
In some embodiments, the inorganic binder is aqueous sodium silicate, and the weight ratio of the aqueous sodium silicate is 7-8 parts.
In still another aspect of the present invention, a construction process of a continuous casting tundish working lining is disclosed, which comprises the following steps according to an embodiment of the present invention:
s1: the construction process comprises the following steps: pouring about 25% of dry materials into the bottom of the tundish, pushing and smoothing the dry materials to form a bottom working layer with the thickness of 5-7 cm, placing a forming die, then putting 60% -70% of the dry materials, tamping the dry materials at the edge of the tundish wall by using a steel pry to fill the dry materials, pouring the rest of the dry materials, vibrating for 10-20 minutes after tamping, and pressing by hands to detect whether the dry materials are filled.
S2: in-mold baking step: regulating the baking temperature to 320-350 ℃, and then igniting and baking for 3-5 hours.
S3: a demolding procedure: cooling the material to 60-70 deg.C, and demolding
S4: an online baking process: baking for 1-2 hours with small fire, baking for 1-2 hours with medium fire, and baking for 1.5-3 hours with big fire.
In some embodiments, the temperature of the small fire baking of the on-line baking is between 200 and 370 ℃, the temperature of the medium fire baking is 680 and 970 ℃, and the temperature of the large fire baking is 1000 and 1100 ℃.
In some embodiments, the construction process of the continuous casting tundish working lining further comprises the following steps of S5: detecting the online baking: and in the die baking process, the sintering condition is observed every 0.5-1 hour, and adjustment is made according to the sintering condition.
In some embodiments, in the process S1, the dry material is prepared in advance, and the step of preparing the dry material in advance is as follows:
s11: placing the aggregate; the aggregate is at least one of 90 dead burnt magnesite with the grain size of 3-5mm, 90 dead burnt magnesite with the grain size of 1-3mm and/or 93 sintered magnesite with the grain size of 0-1 mm.
S12: placing the powder; the powder is at least one of 93 sintered magnesite with 0-200 meshes and/or 95 medium magnesite with 0-200 meshes, and the particles are not too concentrated and the body density is not too low by adding the powder.
S13: and (3) adding an inorganic binder after stirring for more than 2 minutes, and continuously stirring for 5-10 minutes to prepare the dry material in advance.
In yet another aspect of the present invention, a continuous casting tundish working lining is disclosed, which according to an embodiment of the present invention, pours the heavy rail steel up to at least 20 furnaces.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
FIG. 1 is a schematic diagram of a sample containing 4% of an inorganic additive baked at 200 ℃ and at room temperature
FIG. 2 is a schematic diagram of a sample containing 5% of an inorganic additive baked at 200 ℃ and at room temperature
FIG. 3 is a schematic diagram of a sample containing 6% of an inorganic additive baked at 200 ℃ and at room temperature
FIG. 4 is a schematic diagram of a sample containing 7% of an inorganic additive baked at 200 ℃ and at room temperature
FIG. 5 is a schematic diagram of a sample containing 7% of an inorganic additive baked at 1100 ℃ and at room temperature
FIG. 6 is a schematic diagram of a sample containing 7% of an inorganic additive baked at 1500 ℃ and at room temperature
Fig. 7 is a flow chart of a process of constructing a continuous casting tundish working lining according to one embodiment of the present invention.
Fig. 8 is a flowchart of a process for constructing a continuous casting tundish working lining according to another embodiment of the present invention.
Fig. 9 is a flowchart of a construction process of a continuous casting tundish working lining according to still another embodiment of the present invention.
FIG. 10 is a field diagram of a continuous casting tundish working lining with insufficient baking time
FIG. 11 is a field diagram of a continuous casting tundish working lining for a furnace for casting heavy rail steel 20
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
In one aspect of the invention, the invention discloses a dry material for a continuous casting tundish working lining, which is prepared from 90 parts by weight of dead burnt magnesite, 93 parts by weight of sintered magnesite and an inorganic binder in the following weight parts:
31-64 parts of 90-reburning beautifying sand
93 portions of sintered magnesia 19 to 50 portions
7-10 parts of inorganic binder
The inventor finds that the proportion of the 90-reburning magnesite and the 93-sintering magnesite to the inorganic bonding agent can replace the traditional organic bonding agent, the density, the folding resistance and the compressive strength of the prepared dry material can meet the requirements of the dry material for the continuous casting tundish, and the bonding agent does not increase carbon and hydrogen, does not generate harmful smoke in the using and baking processes, and does not harm the environment and the health of workers.
Preferably, in some embodiments, the dry material further comprises 95 medium magnesite and is prepared according to the following weight parts:
9-15 parts of 95 medium magnesite
The addition of the 95 medium magnesite can be more beneficial to the performance improvement of the dry material.
In the 90-heavy burnt magnesite, 93-sintered magnesite and 95-medium magnesite, the contents of 90%, 93% and 95% of MgO are indicated. Dead burned magnesite, sintered magnesite, and medium magnesite are well known to those skilled in the art and will not be described herein.
Preferably, in some embodiments, the dry material is formulated according to the following parts by weight and gradation:
in a specific embodiment, the 90-part burnt sienna with a grain size of 3 to 5mm is 12 to 28 parts by weight, and may be, for example, 12 parts, 13 parts, 14 parts, 15 parts, 16 parts, 17 parts, 18 parts, 19 parts, 20 parts, 21 parts, 22 parts, 23 parts, 24 parts, 25 parts, 26 parts, 27 parts or 28 parts. The 90-weight burnt sienna with the granularity of 1-3mm is 19-36 parts by weight, and can be 19 parts, 20 parts, 21 parts, 22 parts, 23 parts, 24 parts, 25 parts, 26 parts, 27 parts, 28 parts, 29 parts, 30 parts, 31 parts, 32 parts, 33 parts, 34 parts, 35 parts or 36 parts by weight. The 93 parts of sintered magnesite with the particle size of 0-1mm is 19-30 parts by weight, and can be 20 parts, 21 parts, 22 parts, 23 parts, 24 parts, 25 parts, 26 parts, 27 parts, 28 parts or 29 parts by weight. The 93-mesh sintered magnesite with the particle size of 0-200 meshes is 10-20 parts by weight, and can be 11 parts, 12 parts, 13 parts, 14 parts, 15 parts, 16 parts, 17 parts, 18 parts or 19 parts by weight. The body density and other properties can be further improved by different grading formulations.
Preferably, in some embodiments, the 95 medium magnesite clinker is prepared by the following weight parts:
9-15 parts of 95 medium magnesite with granularity of 0-200 meshes
The body density and other properties can be further improved by the addition of 95 medium magnesite, which can be, for example, 10 parts, 11 parts, 12 parts, 13 parts or 14 parts.
In specific examples, the inorganic binder having a particle size of 0 to 200 mesh comprises 7 to 10 parts, for example, 7 parts, 8 parts, 9 parts, and 10 parts. The inventors found that the sample strips and surface properties were not good when the amount of the inorganic binder was slightly small, and as shown in the following table, the following table shows the appearance property characteristic data at room temperature after baking at 200 degrees centigrade for the samples prepared by using 4 parts, 5 parts and 6 parts of the inorganic binder, and it was found that when the amount of the inorganic additive was less than 7 parts, the sample strips were incomplete, the surface layer was seriously peeled off, and the hardness index was also not good (see fig. 1 to 3). When the inorganic additive was added in an amount of 7 parts, the sample bar became intact (FIG. 4), and the surface layer was only slightly peeled off. After baking at 1100 degrees or 1500 degrees (fig. 5 and 6), the surface of the sample remained intact and slightly peeled off.
On the other hand, if the content of the inorganic binder is too high, the line change property (shrinkage property) is affected.
Preferably, the inorganic binder is at least one of sodium metasilicate, hydrous sodium silicate, silica micropowder, bentonite and/or clay.
Preferably, the hydrous silicon silicate is used as an inorganic bonding agent to react with the magnesia, and the performance index of the dry material can be achieved more favorably when the components are 7-8 parts.
In another aspect of the present invention, there is disclosed a process for constructing a dry material for a continuous casting tundish working lining, the process comprising, with reference to fig. 7:
s1: the construction process comprises the following steps: pouring about 25% of dry materials into the bottom of the tundish, pushing and smoothing the dry materials to form a bottom working layer with the thickness of 5-7 cm, placing a forming die, then putting 60% -70% of the dry materials, tamping the dry materials at the edge of the tundish wall by using a steel pry to fill the dry materials, pouring the rest of the dry materials, vibrating for 10-20 minutes after tamping, and pressing by hands to detect whether the dry materials are filled.
In this step, 60% to 70% of the dry material is poured, and may be 61%, 62%, 63%, 64%, 65%, 66%, 67%, 68% or 69%, for example. The dry material is uniformly rammed, the residual dry material is added, and the rammed material is vibrated for 15-20 minutes, the inventor finds that if the vibration time is too short, the inner wall of the continuous casting tundish working lining is cracked (refer to fig. 10), and the inner wall of the working lining can be smooth and not cracked by the vibration for 15-20 minutes, such as 16 minutes, 17 minutes, 18 minutes or 19 minutes.
S2: in-mold baking step: regulating the baking temperature to 320-350 ℃, and then igniting and baking for 3-5 hours.
In the step, the dry material has higher strength along with the increase of the temperature, and the surface of the working lining can be smooth and can not crack by fully baking the dry material for 3 to 5 hours after 320 ℃, such as 330 ℃, 340 ℃, 350 ℃, 360 ℃ or 370 ℃, for 3.5 hours, 4 hours or 4.5 hours. If the baking temperature and the baking time do not reach the standard, the inner wall of the working lining is cracked after demoulding.
S3: a demolding procedure: and demolding after the temperature of the dry material is cooled to 60-70 ℃.
In this step, the dry material is demoulded by reducing the temperature of the dry material to 60-70 ℃, for example 61 ℃, 62 ℃, 63 ℃, 64 ℃, 65 ℃, 66 ℃, 67 ℃, 68 ℃ or 69 ℃.
S4: an online baking process: baking for 1-2 hours with small fire, baking for 1-2 hours with medium fire, and baking for 1.5-3 hours with big fire.
In the step, the continuous casting tundish working lining can have better capability of resisting slag liquid erosion through baking in stages, and in a specific embodiment, the baking time with small fire can be 1.5 hours, the baking time with medium fire can be 1.5 hours, and the baking time with large fire can be 2 hours and 2.5 hours.
In a specific embodiment, the temperature of the small fire baking is between 200 ℃ and 370 ℃, and may be, for example, 210 ℃, 220 ℃, 230 ℃, 240 ℃, 250 ℃, 260 ℃, 270 ℃, 280 ℃, 290 ℃, 300 ℃, 310 ℃, 320 ℃, 330 ℃, 340 ℃, 350 ℃ and 360 ℃. The medium fire baking temperature is 680-970 ℃, such as 690 ℃, 700 ℃, 710 ℃, 720 ℃, 730 ℃, 740 ℃, 750 ℃, 760 ℃, 770 ℃, 780 ℃, 790 ℃, 800 ℃, 810 ℃, 820 ℃, 830 ℃, 840 ℃, 850 ℃, 860 ℃, 870 ℃, 880 ℃, 890 ℃, 900 ℃, 910 ℃, 920 ℃, 930 ℃, 940 ℃, 950 ℃ and 960 ℃. The temperature of the baking with big fire is 1000-1100 ℃, for example, 1000 ℃, 1010 ℃, 1020 ℃, 1030 ℃, 1040 ℃, 1050 ℃, 1060 ℃, 1070 ℃, 1080 ℃ and 1090 ℃. Through a staged baking mode, the slag liquid corrosion resistance of the continuous casting tundish working lining can be improved, and the service life of the continuous casting tundish working lining is prolonged.
In a specific embodiment, referring to fig. 8, further includes S5: detecting the online baking: and in the die baking process, the sintering condition is observed every 0.5-1 hour, and real-time adjustment is made according to the sintering condition. For example, the baking temperature and/or baking time can be adjusted, so that the inner wall of the working lining is smooth and does not crack, and the working lining has better capability of resisting slag liquid corrosion.
In a specific example, referring to fig. 9, in the process S1, the dry material needs to be prepared in advance, and the steps of preparing the dry material in advance are as follows:
s11: placing the aggregate; in this step, bone material is first put in. The aggregate is at least one of 90 dead burnt magnesite with the grain size of 3-5mm, 90 dead burnt magnesite with the grain size of 1-3mm and/or 93 sintered magnesite with the grain size of 0-1 mm.
S12: placing the powder; in this step, the aggregate is placed and then the powder is placed. Preferably, the powder is at least one of 93-mesh sintered magnesite with the particle size of 0-200 meshes and/or 95-mesh medium magnesite with the particle size of 0-200 meshes, and the particles are not too concentrated and the volume density is not too low by adding the powder.
S13: stirring for more than 2 minutes, adding the inorganic bonding agent, and continuously stirring for 5-10 minutes; the dry charge is prepared in advance. In the step, the aggregate and the powder are firstly stirred uniformly to ensure that the particles are more uniformly prepared, and then the inorganic bonding agent is added and stirred for 5-10 minutes. The inventors have found that the inorganic binder requires a longer stirring time, such as 5 minutes, 6 minutes, 7 minutes, 8 minutes, 9 minutes and 10 minutes, after the inorganic binder is added, compared with the stirring time of the organic binder, such as 2 to 3 minutes, to achieve sufficient dispersion of the inorganic eco-friendly agent. However, if the stirring time is too long, the reaction between the inorganic additive and the magnesia may be broken.
In another aspect of the invention, a continuous casting tundish working lining is disclosed, which can reach at least 20 furnaces in number when the heavy rail steel is cast by the continuous casting tundish working lining.
Example 1
The preparation is prepared according to the following weight portion and gradation: 23 parts of 90 dead burnt magnesite with the granularity of 3-5mm, 24 parts of 90 dead burnt magnesite with the granularity of 1-3mm, 25 parts of 93 sintered magnesite with the granularity of 0-1mm, 21 parts of 93 sintered magnesite with the granularity of 0-200 meshes and Na with the granularity of 0-200 meshes2O·SiO2·8H2And O7 parts.
The samples prepared from the dry stock were tested for performance index at 110 c 24H curing temperature, 1100 c 3H baking temperature, and 1500 c 3H baking temperature, respectively.
Example 2
The preparation is prepared according to the following weight portion and gradation: 20 parts of 90 dead burnt magnesite with the granularity of 3-5mm, 26 parts of 90 dead burnt magnesite with the granularity of 1-3mm, 24 parts of 93 sintered magnesite with the granularity of 0-1mm, 23 parts of 93 sintered magnesite with the granularity of 0-200 meshes and Na with the granularity of 0-200 meshes2O·SiO2·8H2And O7 parts.
The samples prepared from the dry stock were tested for performance index at 110 c 24H curing temperature, 1100 c 3H baking temperature, and 1500 c 3H baking temperature, respectively.
Example 3
The preparation is prepared according to the following weight portion and gradation: 26 parts of 90 dead burnt magnesite with the granularity of 3-5mm, 20 parts of 90 dead burnt magnesite with the granularity of 1-3mm, 18 parts of 93 sintered magnesite with the granularity of 0-1mm, 15 parts of 93 sintered magnesite with the granularity of 0-200 meshes, 13 parts of 95 medium magnesite with the granularity of 0-200 meshes and Na with the granularity of 0-200 meshes2O·SiO2·8H2O8 parts
The samples prepared from the dry stock were tested for performance index at 110 c 24H curing temperature, 1100 c 3H baking temperature, and 1500 c 3H baking temperature, respectively.
Example 4
The preparation is prepared according to the following weight portion and gradation: 21 parts of 90 dead burnt magnesite with the granularity of 3-5mm, 22 parts of 90 dead burnt magnesite with the granularity of 1-3mm, 20 parts of 93 sintered magnesite with the granularity of 0-1mm and 93 sintered magnesite with the granularity of 0-200 meshes14 portions of bonded magnesite, 15 portions of 95 medium magnesite with granularity of 0-200 meshes and Na with granularity of 0-200 meshes2O·SiO2·8H2O8 parts
The samples prepared from the dry stock were tested for performance index at 110 c 24H curing temperature, 1100 c 3H baking temperature, and 1500 c 3H baking temperature, respectively.
Example 5
The difference between the embodiment and the embodiment 3 is that 10 parts of 95 medium magnesite clinker with the granularity of 0-200 meshes,
it should be noted that the total weight of the components in this example is less than 100 parts, and for the sake of easy understanding, the conversion is not performed to 100 parts,
comparative example 1:
the preparation is prepared according to the following weight portion and gradation: 15 parts of raw olivine with the granularity of 3-5mm, 16 parts of raw olivine with the granularity of 1-3mm, 23 parts of 87 dead burned magnesia with the granularity of 1-3mm, 13 parts of 87 dead burned magnesia with the granularity of 0-1mm, 14 parts of 87 dead burned magnesia with the granularity of 0-200 meshes, 14 parts of 93 sintered magnesia with the granularity of 0-200 meshes and 5 parts of phenolic resin.
The samples prepared from the dry stock were tested for performance index at 110 c 24H curing temperature, 1100 c 3H baking temperature, and 1500 c 3H baking temperature, respectively.
The 87-heavy burnt magnesia referred to above means that the MgO content is 87%. Green olivine, phenolic resin, is a material well known to those skilled in the art and will not be described in detail herein.
The following table shows comparative data of performance indexes of examples 1 and 2 and comparative example 1, and it can be seen that the performance of the dry material formed by using the inorganic binder reaches that of comparative example 1 using the organic binder, and after adding 95 medium magnesite, the bulk density, the breaking strength, the compressive strength and the linear shrinkage performance of example 2 are even improved.
Example 3:
the dry material prepared by the components in the embodiment 2 adopts the following construction process:
s11: placing the aggregate of 90 dead burnt magnesite with the granularity of 3-5mm, 90 dead burnt magnesite with the granularity of 1-3mm and 93 sintered magnesite with the granularity of 0-1 mm.
S12: and 93 sintered magnesite with the granularity of 0-200 meshes and 95 medium magnesite with the granularity of 0-200 meshes are placed.
S13: stirring the aggregate and the powder for more than 2 minutes, then adding the bonding agent, and continuously stirring for about 8 minutes; preparing in advance to obtain a dry material.
S1: the construction process comprises the following steps: pouring about 25% of dry materials into the bottom of the tundish, pushing and smoothing the dry materials to form a bottom working layer with the thickness of 5-7 cm, placing a forming die, then putting 60% -70% of the dry materials, tamping the dry materials at the edge of the tundish wall by using a steel pry to fill the dry materials, pouring the rest of the dry materials, vibrating for 10-20 minutes after tamping, and pressing by hands to detect whether the dry materials are filled.
S2: in-mold baking step: the baking temperature is adjusted to 320 ℃, and then the mixture is ignited for baking, wherein the baking time is 3.5 hours.
S3: a demolding procedure: demoulding when the temperature of the dry material is cooled to 70 DEG C
S4: an online baking process: baking for 1.5 hours with small fire, then baking for 1.5 hours with medium fire, and baking for 3 hours with big fire.
FIG. 11 is a field view of a continuous casting tundish working lining of a furnace for casting heavy rail steel 20. it can be seen that after casting the steel 20, the inner wall of the lining is only slightly corroded, about 20 mm.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
Claims (10)
1. The dry material for the continuous casting tundish working lining is characterized by being prepared from 90-time sintered magnesite, 93-time sintered magnesite and an inorganic binder in parts by weight as follows:
31-64 parts of 90-reburning beautifying sand
93 portions of sintered magnesia 19 to 50 portions
7-10 parts of inorganic binder.
2. The dry material for the continuous casting tundish working lining according to claim 1, wherein the dry material further comprises 95 medium magnesite and is prepared according to the following weight parts:
9-15 parts of 95 medium magnesite.
3. The dry material for the continuous casting tundish working lining according to claim 1, wherein the dry material is prepared according to the following weight part ratio and gradation:
4. the method for preparing the dry material for the continuous casting tundish working lining according to claim 2, wherein the 95 medium magnesite is prepared according to the following weight part ratio and gradation:
9-15 parts of 95 medium magnesite with the granularity of 0-200 meshes.
5. The dry material for a continuous casting tundish working lining according to claim 1, wherein the inorganic binder is at least one of sodium metasilicate, hydrous sodium silicate, silica fume, bentonite and/or clay.
6. A construction process of a continuous casting tundish working lining, which is characterized in that the construction process adopts the dry material for the continuous casting tundish working lining according to any one of claims 1 to 5, and comprises the following steps:
s1: the construction process comprises the following steps: pouring about 25% of dry materials into the bottom of the tundish, pushing and smoothing the dry materials to form a bottom working layer with the thickness of 5-7 cm, placing a forming die, then putting 60% -70% of the dry materials, tamping the dry materials at the edge of the tundish wall by using a steel pry to fill the dry materials, pouring the rest of the dry materials, vibrating for 10-20 minutes after tamping, and pressing by hands to detect whether the dry materials are filled.
S2: in-mold baking step: regulating the baking temperature to 320-350 ℃, and then igniting and baking for 3-5 hours.
S3: a demolding procedure: cooling the material to 60-70 deg.C, and demolding
S4: an online baking process: baking for 1-2 hours with small fire, baking for 1-2 hours with medium fire, and baking for 1.5-3 hours with big fire.
7. The construction process of the continuous casting tundish working lining as claimed in claim 6, wherein the temperature of the small fire baking of the online baking is between 200 and 370 ℃, the temperature of the medium fire baking is 680 and 970 ℃, and the temperature of the large fire baking is 1000 and 1100 ℃.
8. The process of constructing a continuous casting tundish working lining according to claim 6, further comprising step S5: detecting the online baking: and in the die baking process, the sintering condition is observed every 0.5-1 hour, and adjustment is made according to the sintering condition.
9. The process of constructing a continuous casting tundish working lining according to claim 6, wherein the dry material is prepared in advance in step S1, and the step of preparing the dry material in advance is as follows:
s11: placing the aggregate; the aggregate is at least one of 90 dead burnt magnesite with the grain size of 3-5mm, 90 dead burnt magnesite with the grain size of 1-3mm and/or 93 sintered magnesite with the grain size of 0-1 mm.
S12: placing the powder; the powder is at least one of 93 sintered magnesite with 0-200 meshes and/or 95 medium magnesite with 0-200 meshes, and the particles are not too concentrated and the body density is not too low by adding the powder.
S13: stirring for more than 2 minutes, adding the inorganic binder, and continuously stirring for 5-10 minutes.
10. A continuous casting tundish working lining, characterized in that it is obtained by the process of claim 1-9, and the number of furnaces for casting heavy rail steel can reach at least 20.
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