CN115159961B - Method for recycling waste magnesium dry material for continuous casting tundish - Google Patents
Method for recycling waste magnesium dry material for continuous casting tundish Download PDFInfo
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- 239000002699 waste material Substances 0.000 title claims abstract description 34
- 238000000034 method Methods 0.000 title claims abstract description 29
- 239000000463 material Substances 0.000 title claims abstract description 24
- 238000004064 recycling Methods 0.000 title claims abstract description 18
- 238000009749 continuous casting Methods 0.000 title claims abstract description 14
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 title description 5
- 229910052749 magnesium Inorganic materials 0.000 title description 5
- 239000011777 magnesium Substances 0.000 title description 5
- RWDBMHZWXLUGIB-UHFFFAOYSA-N [C].[Mg] Chemical compound [C].[Mg] RWDBMHZWXLUGIB-UHFFFAOYSA-N 0.000 claims abstract description 41
- 239000011819 refractory material Substances 0.000 claims abstract description 33
- 239000002893 slag Substances 0.000 claims abstract description 33
- 238000002156 mixing Methods 0.000 claims abstract description 30
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 27
- 239000010959 steel Substances 0.000 claims abstract description 27
- 239000000203 mixture Substances 0.000 claims abstract description 26
- 239000000440 bentonite Substances 0.000 claims abstract description 25
- 229910000278 bentonite Inorganic materials 0.000 claims abstract description 25
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 claims abstract description 25
- 239000011230 binding agent Substances 0.000 claims abstract description 25
- 238000003723 Smelting Methods 0.000 claims abstract description 23
- 239000010459 dolomite Substances 0.000 claims abstract description 18
- 229910000514 dolomite Inorganic materials 0.000 claims abstract description 18
- RHZUVFJBSILHOK-UHFFFAOYSA-N anthracen-1-ylmethanolate Chemical compound C1=CC=C2C=C3C(C[O-])=CC=CC3=CC2=C1 RHZUVFJBSILHOK-UHFFFAOYSA-N 0.000 claims abstract description 17
- 239000003830 anthracite Substances 0.000 claims abstract description 17
- 241000143432 Daldinia concentrica Species 0.000 claims abstract description 16
- 238000001816 cooling Methods 0.000 claims abstract description 9
- 238000005245 sintering Methods 0.000 claims abstract description 8
- 238000000227 grinding Methods 0.000 claims abstract description 5
- 229910052799 carbon Inorganic materials 0.000 claims description 10
- 229910018072 Al 2 O 3 Inorganic materials 0.000 claims description 9
- 238000005096 rolling process Methods 0.000 claims description 9
- 229910004298 SiO 2 Inorganic materials 0.000 claims description 8
- 239000007789 gas Substances 0.000 claims description 8
- 238000010079 rubber tapping Methods 0.000 claims description 6
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 5
- 229910052760 oxygen Inorganic materials 0.000 claims description 5
- 239000001301 oxygen Substances 0.000 claims description 5
- 238000012958 reprocessing Methods 0.000 claims description 5
- 238000012216 screening Methods 0.000 claims 2
- 230000007613 environmental effect Effects 0.000 abstract 1
- CPLXHLVBOLITMK-UHFFFAOYSA-N Magnesium oxide Chemical compound [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 34
- 239000000395 magnesium oxide Substances 0.000 description 17
- 238000007873 sieving Methods 0.000 description 10
- 238000004519 manufacturing process Methods 0.000 description 5
- 238000005266 casting Methods 0.000 description 4
- 230000001105 regulatory effect Effects 0.000 description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 3
- 238000003912 environmental pollution Methods 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- 239000000047 product Substances 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 239000010977 jade Substances 0.000 description 2
- 238000009628 steelmaking Methods 0.000 description 2
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 239000013065 commercial product Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
Classifications
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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
- C04B35/03—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
- 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
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/28—Manufacture of steel in the converter
- C21C5/42—Constructional features of converters
- C21C5/44—Refractory linings
- C21C5/441—Equipment 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
- 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
- C04B2235/3205—Alkaline earth oxides or oxide forming salts thereof, e.g. beryllium oxide
- C04B2235/3208—Calcium oxide or oxide-forming salts thereof, e.g. lime
-
- 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
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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
- C04B2235/34—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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- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
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- 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
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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
- C04B2235/42—Non metallic elements added as constituents or additives, e.g. sulfur, phosphor, selenium or tellurium
- C04B2235/422—Carbon
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract
The invention relates to a method for recycling tundish dry material for continuous casting in a steel mill, belonging to the technical field of secondary resource recycling of steel smelting refractory materials. The method comprises the following steps: collecting the used waste tundish working layer refractory material, and preparing anthracite and bentonite binder; mixing the waste tundish working layer refractory material and anthracite, and grinding the mixture by adopting a ball mill until the granularity is less than 3mm after the mixture is uniformly mixed to obtain a mixture; adding bentonite binder into the mixture, uniformly mixing, and adopting a ball making machine to make balls to obtain mixed balls; baking and sintering the mixed balls for 30-40 minutes by using a gas baking oven, and naturally cooling to room temperature to obtain the magnesium carbon balls; in the converter smelting or slag splashing furnace protection process, the magnesium carbon balls are used for replacing light burned dolomite. The method reduces the consumption cost of the refractory materials in the steel mill, reduces the resource waste, lightens the environmental protection pressure and is easy to popularize and apply.
Description
Technical Field
The invention belongs to the technical field of secondary resource recycling of steel smelting refractory materials, and particularly relates to a method for recycling tundish dry materials for continuous casting in a steel mill.
Background
In the steelmaking production process, a large amount of refractory materials containing MgO are used, and along with gradual reduction of resources and increase of national control force, the price of the refractory materials containing MgO is continuously increased, so that huge pressure is brought to steelmaking production cost. Currently, most steel mills use a monolithic casting process in which the permanent layer is made of a high alumina casting material (Al 2 O 3： 60%) and a magnesium dry material (MgO: 70% -85%, the content is selected according to the casting process and the using time), and the average MgO content of the magnesia dry material of the tundish working layer used for the jade steel is 77%. After one casting time is finished, the working layer of the tundish is required to be replaced, and the original tundish is usedThe magnesium dry material is changed into waste refractory material which is poured out along with steel slag to become unavailable resources, so that the resource waste is caused, and the environment-friendly treatment pressure is increased. Therefore, how to overcome the defects of the prior art is a problem which needs to be solved in the technical field of recycling of secondary resources of the steel smelting refractory at present.
Disclosure of Invention
The invention aims to solve the defects of the prior art, and provides a method for recycling tundish dry material for continuous casting of a steel plant.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows:
a method for recycling tundish dry material for continuous casting in a steel mill comprises the following steps:
step (1), collecting used waste tundish working layer refractory materials, and preparing anthracite and bentonite binders;
step (2), mixing the refractory materials of the waste tundish working layer and anthracite according to the mass ratio of 86-88:9.5-10.5, and grinding the mixture to the granularity of less than 3mm by adopting a ball mill after uniformly mixing to obtain a mixture;
adding bentonite binder into the mixture, uniformly mixing, and then adopting a ball making machine to make balls to obtain mixed balls; the mass ratio of the refractory material of the working layer of the waste tundish to the bentonite binder is 86-88:2.8-3.2;
step (4), baking and sintering the mixed balls for 30-40 minutes by using a gas baking oven, and naturally cooling to room temperature to obtain the magnesium carbon balls;
and (5) adopting magnesium carbon spheres to replace light burned dolomite in the converter smelting or slag splashing furnace protection process.
Further, it is preferable that in the step (2), after the ball mill rolls, sieving is performed by using a sieving machine, and the part having a particle size of > 3mm is thrown into the ball mill again to roll.
Further, it is preferable that in the step (3), the diameter of the mixing ball is 20.+ -. 3mm.
Further, in the step (4), it is preferable that the baked and sintered mixed balls are sieved by a sieve, and the mixed balls having diameters of not 20.+ -.3 mm are returned to the ball mill of the step (2) to be reprocessed.
Further, in the step (5), preferably, in the step (5), 150-200 kg/furnace of the magnesium carbon balls is added into the furnace after the converter smelting is successfully started and ignited, and meanwhile, the total adding amount of the light burned dolomite is reduced by 500-600 kg/furnace; when the endpoint C is less than or equal to 0.04% after the converter is smelted, 50-70Kg of magnesium carbon balls are added into the converter after tapping is completed, slag splashing and furnace protecting operation is carried out after slag adjustment are carried out; the converter endpoint C is greater than 0.04% of the heat is not added.
The invention also provides the magnesium carbon sphere prepared by the method for recycling the tundish dry material for continuous casting in the steel mill.
Further, preferably, the magnesium carbon sphere comprises the following components in percentage by mass:
MgO 74%-77%、C 7%-9%、Al 2 O 3 8%-10%、SiO 2 4%-6%、CaO 1%-3%、H 2 o1% -2%, totaling 100%. In addition, the magnesium carbon sphere may contain unavoidable impurities such as MgO, K 2 O、Na 2 O, the invention is not limited thereto.
The bentonite binder adopted by the invention is a commercial product, preferably contains SiO 2 ：66.5%、Al 2 O 3 ：14.7%、CaO:2.3%、MgO：3.4%、K 2 O：0.2%、Na 2 O：0.3%、H 2 9.3% of O and the balance of other nonmetallic oxides.
The consumption of the refractory material of the working layer of the jade steel tundish is 5.5-6.0 tons/piece, and the MgO content is as follows: 77%. The residual quantity of the used tundish working layers is 4.0-4.5 tons/piece, and the residual MgO content is as follows: 72% -75%; collecting waste working layer refractory materials remained in the used tundish, rolling the waste working layer refractory materials into particles with the granularity less than 3mm by using a ball mill, uniformly mixing the particles with the granularity less than 3mm with anthracite and bentonite binder, and preparing the mixture into a ball shape; baking with gas for 30-40min, and cooling to room temperature; the slag is added into a converter through a feed bin, and is used for replacing part of light burned dolomite in the smelting or slag splashing furnace protection process of the converter and used as slag regulating material for slag splashing furnace protection of the converter; finally, the method reduces the light burned dolomite consumption of the converter slag-forming material, improves the slag splashing furnace protection effect under the high FeO condition of the semisteel smelting slag, and achieves the comprehensive utilization of waste idle resources. The compressive strength of the magnesium carbon sphere prepared by the invention is 500-700N/magnesium carbon sphere.
Compared with the prior art, the invention has the beneficial effects that:
(1) The invention mainly combines the service condition of refractory materials in a steel mill, prepares magnesia carbon spheres from a tundish working layer magnesia dry castable and is used for converter slagging and slag adjustment, improves the recycling of waste resources, saves the cost of the steel mill and simultaneously achieves the aim of reducing environmental pollution;
(2) 150-200 kg/furnace of magnesium carbon spheres is added in the converter smelting process, so that the addition amount of light burned dolomite of a slag forming material is reduced by 500-600 kg/furnace, and the slag forming cost of the converter is saved by 1.3 yuan/ton; the annual steel production is 140 ten thousand tons, and the cost can be saved by 182 ten thousand yuan/year.
(3) The total slag of converter smelting after using the magnesium carbon ball is reduced by 500-600 Kg/furnace, slag iron is reduced by 60 Kg/furnace, and steel consumption is reduced by 1.1Kg/t.
(4) The waste secondary resources are treated, so that the environmental pollution is reduced, and the production cost is reduced.
Detailed Description
The present invention will be described in further detail with reference to examples.
It will be appreciated by those skilled in the art that the following examples are illustrative of the present invention and should not be construed as limiting the scope of the invention. The specific techniques or conditions are not identified in the examples and are performed according to techniques or conditions described in the literature in this field or according to the product specifications. The materials or equipment used are conventional products available from commercial sources, not identified to the manufacturer.
Example 1
A method for recycling tundish dry material for continuous casting in a steel mill comprises the following steps:
step (1), collecting used waste tundish working layer refractory materials, and preparing anthracite and bentonite binders;
step (2), mixing the refractory materials of the waste tundish working layer and anthracite according to the mass ratio of 87:10, and grinding the mixture to the granularity of less than 3mm by adopting a ball mill after uniformly mixing to obtain a mixture;
adding bentonite binder into the mixture, uniformly mixing, and then adopting a ball making machine to make balls to obtain mixed balls; the mass ratio of the waste tundish working layer refractory material to the bentonite binder is 87:3, a step of;
step (4), baking and sintering the mixed balls for 35 minutes by using a gas baking oven, and naturally cooling to room temperature to obtain the magnesium carbon balls;
and (5) adopting magnesium carbon spheres to replace light burned dolomite in the converter smelting or slag splashing furnace protection process.
Example 2
A method for recycling tundish dry material for continuous casting in a steel mill comprises the following steps:
step (1), collecting used waste tundish working layer refractory materials, and preparing anthracite and bentonite binders;
step (2), mixing the refractory materials of the working layer of the waste tundish and anthracite according to the mass ratio of 86:9.5, and rolling the mixture to the granularity of less than 3mm by adopting a ball mill after uniformly mixing to obtain a mixture;
adding bentonite binder into the mixture, uniformly mixing, and then adopting a ball making machine to make balls to obtain mixed balls; the mass ratio of the refractory material of the working layer of the waste tundish to the bentonite binder is 86:2.8;
step (4), baking and sintering the mixed balls for 30 minutes by using a gas baking oven, and naturally cooling to room temperature to obtain the magnesium carbon balls;
and (5) adopting magnesium carbon spheres to replace light burned dolomite in the converter smelting or slag splashing furnace protection process.
In the step (2), after the ball mill rolls, a sieving machine is adopted for sieving, and the part with the granularity more than 3mm is put into the ball mill again for rolling.
In the step (3), the diameter of the mixing ball is 20+/-3 mm.
In the step (4), the baked and sintered mixed balls are sieved by a screen, and the mixed balls with the diameters of not 20+/-3 mm are returned to the ball mill in the step (2) for reprocessing.
In the step (5), 150 kg/furnace of the magnesium carbon ball is added into the furnace after the converter smelting, the oxygen starting and the ignition are successful, and meanwhile, the total adding amount of light burned dolomite is reduced by 500 kg/furnace; when the endpoint C is less than or equal to 0.04% after the converter is smelted, 50Kg of magnesium carbon balls are added into the converter after tapping is completed, slag is regulated, and slag splashing and furnace protection are carried out; the converter endpoint C is greater than 0.04% of the heat is not added.
The magnesium carbon sphere prepared by the embodiment comprises the following components in percentage by mass:
MgO 74%、C 7%、Al 2 O 3 8%、SiO 2 6% 、CaO 3%、H 2 o2% in total 100%.
Example 3
A method for recycling tundish dry material for continuous casting in a steel mill comprises the following steps:
step (1), collecting used waste tundish working layer refractory materials, and preparing anthracite and bentonite binders;
step (2), mixing the refractory materials of the working layer of the waste tundish and anthracite according to the mass ratio of 88:10.5, and rolling the mixture to the granularity of less than 3mm by adopting a ball mill after uniformly mixing to obtain a mixture;
adding bentonite binder into the mixture, uniformly mixing, and then adopting a ball making machine to make balls to obtain mixed balls; the mass ratio of the refractory material of the working layer of the waste tundish to the bentonite binder is 88:3.2;
step (4), baking and sintering the mixed balls for 40 minutes by using a gas baking oven, and naturally cooling to room temperature to obtain the magnesium carbon balls;
and (5) adopting magnesium carbon spheres to replace light burned dolomite in the converter smelting or slag splashing furnace protection process.
In the step (2), after the ball mill rolls, a sieving machine is adopted for sieving, and the part with the granularity more than 3mm is put into the ball mill again for rolling.
In the step (3), the diameter of the mixing ball is 20+/-3 mm.
In the step (4), the baked and sintered mixed balls are sieved by a screen, and the mixed balls with the diameters of not 20+/-3 mm are returned to the ball mill in the step (2) for reprocessing.
In the step (5), 200 kg/furnace of the magnesium carbon ball is added into the furnace after the converter smelting, the oxygen starting and the ignition are successful, and the total adding amount of light burned dolomite is reduced by 600 kg/furnace; when the endpoint C is less than or equal to 0.04% after converter smelting, adding 70Kg of magnesium carbon balls into the converter after tapping is completed, and performing slag splashing and furnace protection operation after slag adjustment; the converter endpoint C is greater than 0.04% of the heat is not added.
The magnesium carbon sphere prepared by the embodiment comprises the following components in percentage by mass:
MgO 77%、C 9%、Al 2 O 3 8%%、SiO 2 4% 、CaO 1%、H 2 o1% in total 100%.
Example 4
A method for recycling tundish dry material for continuous casting in a steel mill comprises the following steps:
step (1), collecting used waste tundish working layer refractory materials, and preparing anthracite and bentonite binders;
step (2), mixing the refractory materials of the waste tundish working layer and anthracite according to the mass ratio of 87:10, and grinding the mixture to the granularity of less than 3mm by adopting a ball mill after uniformly mixing to obtain a mixture;
adding bentonite binder into the mixture, uniformly mixing, and then adopting a ball making machine to make balls to obtain mixed balls; the mass ratio of the refractory material of the working layer of the waste tundish to the bentonite binder is 87:3;
step (4), baking and sintering the mixed balls for 30-40 minutes by using a gas baking oven, and naturally cooling to room temperature to obtain the magnesium carbon balls;
and (5) adopting magnesium carbon spheres to replace light burned dolomite in the converter smelting or slag splashing furnace protection process.
In the step (2), after the ball mill rolls, a sieving machine is adopted for sieving, and the part with the granularity more than 3mm is put into the ball mill again for rolling.
In the step (3), the diameter of the mixing ball is 20+/-3 mm.
In the step (4), the baked and sintered mixed balls are sieved by a screen, and the mixed balls with the diameters of not 20+/-3 mm are returned to the ball mill in the step (2) for reprocessing.
In the step (5), 160 kg/furnace of the magnesia carbon spheres is added into the furnace after the converter smelting, the oxygen starting and the ignition are successful, and the total adding amount of the light burned dolomite is reduced by 570 kg/furnace; when the endpoint C is less than or equal to 0.04% after the converter is smelted, 65Kg of magnesium carbon balls are added into the converter after tapping is completed, slag is regulated, and slag splashing and furnace protection operation is performed; the converter endpoint C is greater than 0.04% of the heat is not added.
The magnesium carbon sphere prepared by the embodiment comprises the following components in percentage by mass:
MgO 75%、C 8%、Al 2 O 3 10%、SiO 2 5% 、CaO 1%、H 2 o1% in total 100%.
Example 5
A method for recycling tundish dry material for continuous casting in a steel mill comprises the following steps:
step (1), collecting used waste tundish working layer refractory materials, and preparing anthracite and bentonite binders;
step (2), mixing the refractory materials of the waste tundish working layer and anthracite according to the mass ratio of 86.5:9.8, and rolling the mixture to the granularity of less than 3mm by adopting a ball mill after uniformly mixing to obtain a mixture;
adding bentonite binder into the mixture, uniformly mixing, and then adopting a ball making machine to make balls to obtain mixed balls; the mass ratio of the refractory material of the working layer of the waste tundish to the bentonite binder is 86.5:3;
step (4), baking and sintering the mixed balls for 35 minutes by using a gas baking oven, and naturally cooling to room temperature to obtain the magnesium carbon balls;
and (5) adopting magnesium carbon spheres to replace light burned dolomite in the converter smelting or slag splashing furnace protection process.
In the step (2), after the ball mill rolls, a sieving machine is adopted for sieving, and the part with the granularity more than 3mm is put into the ball mill again for rolling.
In the step (3), the diameter of the mixing ball is 20+/-3 mm.
In the step (4), the baked and sintered mixed balls are sieved by a screen, and the mixed balls with the diameters of not 20+/-3 mm are returned to the ball mill in the step (2) for reprocessing.
In the step (5), 170 kg/furnace of the magnesium carbon ball is added into the furnace after the converter smelting, the oxygen starting and the ignition are successful, and the total adding amount of light burned dolomite is reduced by 550 kg/furnace; when the endpoint C is less than or equal to 0.04% after the converter is smelted, 60Kg of magnesium carbon balls are added into the converter after tapping is completed, slag is regulated, and slag splashing and furnace protection operation is performed; the converter endpoint C is greater than 0.04% of the heat is not added.
The magnesium carbon sphere prepared by the embodiment comprises the following components in percentage by mass:
MgO 76%、C 7.5%、Al 2 O 3 9%、SiO 2 4% 、CaO 2%、H 2 o1.5% and total 100%.
By adopting the scheme of the embodiment of the invention, the addition amount of the slag-forming material light burned dolomite is reduced by 500-600 kg/furnace, and the slag-forming cost of the converter is saved by 1.3 yuan/ton; the total slag is reduced by 500-600 kg/furnace, and the consumption of steel materials is reduced by 1.1kg/t; meanwhile, waste secondary resources are treated, so that the environmental pollution is reduced, and meanwhile, the production cost is reduced. In addition, after the magnesium carbon spheres are used, the smelting end point of the converter is improved, the phenomenon of drawing and blowing is reduced, and the reduction of inclusions in steel is beneficial to improving the quality of steel products.
The foregoing has shown and described the basic principles, principal features and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, and that the above embodiments and descriptions are merely illustrative of the principles of the present invention, and various changes and modifications may be made without departing from the spirit and scope of the invention, which is defined in the appended claims. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (3)
1. The method for recycling the tundish dry material for continuous casting in the steel mill is characterized by comprising the following steps of:
step (1), collecting used waste tundish working layer refractory materials, and preparing anthracite and bentonite binders;
step (2), mixing the refractory materials of the waste tundish working layer and anthracite according to the mass ratio of 86-88:9.5-10.5, and grinding the mixture to the granularity of less than 3mm by adopting a ball mill after uniformly mixing to obtain a mixture;
adding bentonite binder into the mixture, uniformly mixing, and then adopting a ball making machine to make balls to obtain mixed balls; the mass ratio of the refractory material of the working layer of the waste tundish to the bentonite binder is 86-88:2.8-3.2;
step (4), baking and sintering the mixed balls for 30-40 minutes by using a gas baking oven, and naturally cooling to room temperature to obtain the magnesium carbon balls;
step (5), adopting magnesium carbon spheres to replace light burned dolomite in the converter smelting or slag splashing furnace protection process;
in the step (2), after the ball mill rolls, screening is carried out by adopting a screening machine, and the part with the granularity more than 3mm is put into the ball mill again for rolling;
in the step (5), 150-200 kg/furnace of the magnesium carbon ball is added into the furnace after the converter smelting, the oxygen starting and the ignition are successful, and the total adding amount of light burned dolomite is reduced by 500-600 kg/furnace; when the endpoint C is less than or equal to 0.04% after the converter is smelted, 50-70Kg of magnesium carbon balls are added into the converter after tapping is completed, slag splashing and furnace protecting operation is carried out after slag adjustment are carried out; the furnace number of the converter endpoint C is more than 0.04 percent;
in the step (3), the diameter of the mixing ball is 20+/-3 mm;
in the step (4), the baked and sintered mixed balls are screened by adopting a screen, and the mixed balls with the diameters of not 20+/-3 mm are returned to the ball mill in the step (2) for reprocessing;
the magnesium carbon sphere comprises the following components in percentage by mass:
MgO 74%-77%、C 7%-9%、Al 2 O 3 8%-10%、SiO 2 4%-6% 、CaO 1%-3%、H 2 o1% -2%, totaling 100%.
2. The magnesium carbon sphere prepared by the method for recycling tundish dry material for continuous casting in a steel mill according to claim 1.
3. The magnesium carbon sphere according to claim 2, comprising the following components in mass percent:
MgO 74%-77%、C 7%-9%、Al 2 O 3 8%-10%、SiO 2 4%-6% 、CaO 1%-3%、H 2 o1% -2%, totaling 100%.
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| CN116854492A (en) * | 2023-07-25 | 2023-10-10 | 湖南湘钢瑞泰科技有限公司 | Method for recycling magnesium-containing mixed waste brick slag |
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