CN117069480A - Low-carbon magnesia carbon brick for producing stainless steel by converter and preparation process thereof - Google Patents
Low-carbon magnesia carbon brick for producing stainless steel by converter and preparation process thereof Download PDFInfo
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- CN117069480A CN117069480A CN202311025636.7A CN202311025636A CN117069480A CN 117069480 A CN117069480 A CN 117069480A CN 202311025636 A CN202311025636 A CN 202311025636A CN 117069480 A CN117069480 A CN 117069480A
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- CPLXHLVBOLITMK-UHFFFAOYSA-N Magnesium oxide Chemical compound [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 title claims abstract description 208
- 239000000395 magnesium oxide Substances 0.000 title claims abstract description 104
- 229910052799 carbon Inorganic materials 0.000 title claims abstract description 81
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title claims abstract description 65
- 239000011449 brick Substances 0.000 title claims abstract description 41
- 239000010935 stainless steel Substances 0.000 title claims abstract description 25
- 229910001220 stainless steel Inorganic materials 0.000 title claims abstract description 25
- 238000002360 preparation method Methods 0.000 title claims abstract description 13
- 239000013078 crystal Substances 0.000 claims abstract description 45
- KXGFMDJXCMQABM-UHFFFAOYSA-N 2-methoxy-6-methylphenol Chemical compound [CH]OC1=CC=CC([CH])=C1O KXGFMDJXCMQABM-UHFFFAOYSA-N 0.000 claims abstract description 19
- 239000005011 phenolic resin Substances 0.000 claims abstract description 19
- 229920001568 phenolic resin Polymers 0.000 claims abstract description 19
- 239000010439 graphite Substances 0.000 claims abstract description 13
- 229910002804 graphite Inorganic materials 0.000 claims abstract description 13
- 239000002994 raw material Substances 0.000 claims abstract description 10
- 235000019580 granularity Nutrition 0.000 claims description 41
- 239000000843 powder Substances 0.000 claims description 29
- 239000010426 asphalt Substances 0.000 claims description 14
- 229920005989 resin Polymers 0.000 claims description 12
- 239000011347 resin Substances 0.000 claims description 12
- 238000001035 drying Methods 0.000 claims description 10
- 238000002156 mixing Methods 0.000 claims description 10
- 238000004519 manufacturing process Methods 0.000 claims description 9
- 229910052751 metal Inorganic materials 0.000 claims description 8
- 239000002184 metal Substances 0.000 claims description 8
- 238000000034 method Methods 0.000 claims description 7
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 4
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 4
- 238000003825 pressing Methods 0.000 claims description 4
- 239000011863 silicon-based powder Substances 0.000 claims description 4
- 229920001187 thermosetting polymer Polymers 0.000 claims description 4
- 238000000227 grinding Methods 0.000 claims description 3
- 238000004898 kneading Methods 0.000 claims description 3
- 238000009628 steelmaking Methods 0.000 description 12
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 7
- 239000012535 impurity Substances 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- 238000000748 compression moulding Methods 0.000 description 3
- 230000007547 defect Effects 0.000 description 3
- 229910052742 iron Inorganic materials 0.000 description 3
- 238000000465 moulding Methods 0.000 description 3
- 229910000851 Alloy steel Inorganic materials 0.000 description 2
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- 239000011230 binding agent Substances 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 229910000975 Carbon steel Inorganic materials 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 229910001021 Ferroalloy Inorganic materials 0.000 description 1
- 229910052581 Si3N4 Inorganic materials 0.000 description 1
- 238000003723 Smelting Methods 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 229910001297 Zn alloy Inorganic materials 0.000 description 1
- HRZMCMIZSOGQJT-UHFFFAOYSA-N [Zn].[Mn].[Mg] Chemical compound [Zn].[Mn].[Mg] HRZMCMIZSOGQJT-UHFFFAOYSA-N 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 239000010962 carbon steel Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 229910052593 corundum Inorganic materials 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000009970 fire resistant effect Effects 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000008595 infiltration Effects 0.000 description 1
- 238000001764 infiltration Methods 0.000 description 1
- 239000001095 magnesium carbonate Substances 0.000 description 1
- 235000014380 magnesium carbonate Nutrition 0.000 description 1
- ZLNQQNXFFQJAID-UHFFFAOYSA-L magnesium carbonate Chemical compound [Mg+2].[O-]C([O-])=O ZLNQQNXFFQJAID-UHFFFAOYSA-L 0.000 description 1
- 229910000021 magnesium carbonate Inorganic materials 0.000 description 1
- 238000003801 milling Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 239000012188 paraffin wax Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 238000007873 sieving Methods 0.000 description 1
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- BIKXLKXABVUSMH-UHFFFAOYSA-N trizinc;diborate Chemical compound [Zn+2].[Zn+2].[Zn+2].[O-]B([O-])[O-].[O-]B([O-])[O-] BIKXLKXABVUSMH-UHFFFAOYSA-N 0.000 description 1
- 229910001845 yogo sapphire Inorganic materials 0.000 description 1
- 229910052845 zircon Inorganic materials 0.000 description 1
- GFQYVLUOOAAOGM-UHFFFAOYSA-N zirconium(iv) silicate Chemical compound [Zr+4].[O-][Si]([O-])([O-])[O-] GFQYVLUOOAAOGM-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- 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
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/622—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
- C04B2235/42—Non metallic elements added as constituents or additives, e.g. sulfur, phosphor, selenium or tellurium
- C04B2235/422—Carbon
- C04B2235/425—Graphite
-
- 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
- C04B2235/70—Aspects relating to sintered or melt-casted ceramic products
- C04B2235/96—Properties of ceramic products, e.g. mechanical properties such as strength, toughness, wear resistance
- C04B2235/9607—Thermal properties, e.g. thermal expansion coefficient
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Ceramic Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Compositions Of Oxide Ceramics (AREA)
Abstract
The application relates to a low-carbon magnesia carbon brick for producing stainless steel by a converter and a preparation process thereof, wherein the raw materials comprise 20-25% of large-crystal magnesia with granularity of 3-5 mm, 25-30% of large-crystal magnesia with granularity of 1-3 mm, 17-23% of large-crystal magnesia with granularity of 0-1 mm, 15-20% of large-crystal magnesia with granularity of less than 0.088mm, 9% of graphite with grade not less than-194, 4% of premix and 3-4% of phenolic resin.
Description
Technical Field
The application relates to the technical field of low-carbon magnesia carbon bricks, in particular to a low-carbon magnesia carbon brick for producing stainless steel by a converter and a preparation process thereof.
Background
The converter steelmaking is mainly made of molten iron, scrap steel and ferroalloy, the external energy is not used, the steelmaking process is completed in the converter by means of the physical heat of the molten iron and the heat generated by the chemical reaction between molten iron components, the converter is the most common steelmaking equipment used at present, the converter is mainly used for smelting carbon steel, alloy steel and copper and nickel, usually the converter adopts magnesia carbon bricks as a furnace lining, but the carbon content of the current furnace lining is higher, the service life of the steelmaking converter still needs to be further improved, and the production efficiency and the cost of a steel mill are greatly affected.
For example, the Chinese patent with publication number of CN103396138B discloses a magnesia carbon brick of a converter and a preparation method thereof, and the method comprises the following steps: 1) Sorting and removing impurities; 2) Crushing the pseudoparticles; 3) Heat treatment, wherein MgO is more than or equal to 75%, siO2 is less than or equal to 3.6%, caO is less than or equal to 2.2%, fe2O3 is less than or equal to 1.9%, and Al2O3 is less than or equal to 4.5% of regenerated materials for standby; 4) Crushing part of the reclaimed materials treated in the step 3) further and sieving the crushed reclaimed materials and the rest reclaimed materials together; 5) And (5) performing compression molding by adopting a gradient molding technology.
For another example, the Chinese patent with the publication number of CN113321491B comprises a magnesia carbon brick body and a waterproof coating arranged on the surface of the magnesia carbon brick body, wherein the magnesia carbon brick body comprises the following raw materials in percentage by mass: 55-72% of magnesia particles, 7-22% of magnesia fine powder, 4-15% of zircon sand, 1-4% of silicon nitride iron powder, 1-8% of crystalline flake graphite, 0.5-3% of zinc borate, 1-3% of magnesium manganese zinc alloy powder, 1-4% of phenolic resin, and the water-proof coating comprises the following raw materials in percentage by mass: 45-70% of paraffin and 30-55% of glass powder.
However, the magnesia carbon bricks of the steelmaking converter in the technology have higher carbon content which is more than 8 percent, and the service life of the steelmaking converter is influenced.
Therefore, aiming at the defects of the prior art, it is necessary to provide a low-carbon magnesia carbon brick for producing stainless steel by a converter and a preparation process thereof to solve the defects of the prior art.
Disclosure of Invention
The application aims to overcome the defects of the prior art and provide the low-carbon magnesia carbon brick for producing stainless steel by the converter and the preparation process thereof.
The above object of the present application is achieved by the following means.
The low-carbon magnesia carbon brick for producing stainless steel in a converter and a preparation process thereof are provided, wherein the raw materials comprise 20-25% of large-crystal magnesia with the granularity of 3-5 mm, 25-30% of large-crystal magnesia with the granularity of 1-3 mm, 17-23% of large-crystal magnesia with the granularity of 0-1 mm, 15-20% of large-crystal magnesia with the granularity of less than 0.088mm, 9% of graphite with the grade of not less than-194, 4% of premix and 3-4% of phenolic resin;
the premix accounting for 4 percent of the low-carbon magnesia carbon brick consists of 0.3 percent of large-crystal magnesia with the granularity of 0mm-1mm, 2 percent of metal aluminum powder, 0.5 percent of metal silicon powder, 1 percent of asphalt powder and 0.2 percent of resin powder.
Specifically, the large-crystal magnesia adopts large-crystal magnesia with MgO content more than 98%, the asphalt powder adopts high-temperature asphalt powder with softening point of 95-120 ℃, the resin powder adopts carbon-containing resin powder, and the phenolic resin adopts thermosetting phenolic resin.
Preferably, the preparation process comprises the following steps:
s1, crushing large magnesia with MgO content more than 98% into large crystallized magnesia with three granularities of 3mm-5mm, 1mm-3mm and 0mm-1 mm;
s2, grinding the large crystallized magnesia with the granularity of 0mm-1mm in the step S1 to the granularity of less than 0.088mm;
s3, carrying out high-speed mixing on large-crystal magnesia with the granularity of 3mm-5mm, 1mm-3mm, 0mm-1mm and less than 0.088mm, phenolic resin and premix;
s4, pressing and forming the mixed pug;
s5, drying the formed green bricks.
Specifically, the high-speed kneading in step S3 includes the steps of:
s31, placing large crystal magnesia with the granularity of 3mm-5mm, 1mm-3mm and 0mm-1mm into a high-speed mixer together, and then adding phenolic resin for mixing for 3-5 minutes;
s32, sequentially adding large-crystal magnesia, graphite and premix with granularity smaller than 0.088mm into a high-speed mixer, and mixing again for 8-10 minutes.
Specifically, the temperature in step S3 is maintained between 45℃and 50 ℃.
Further, in step S4, the kneaded pug is pressed by a 1650 ton electric screw press.
Preferably, the drying conditions in step S5 are constant temperature drying at 200℃for 10 hours.
According to the application, the mixture ratio is carried out by large magnesia crystals with various different granularities, the mixture and the premix are mixed with a binder and the like for compression molding at high speed, so that the carbon source is optimized, the carbon content of the low-carbon magnesia carbon brick for producing stainless steel by a converter is reduced to be less than 6%, and the service life of the steelmaking converter is prolonged under the condition that other rational indexes are not influenced.
Drawings
The application is further illustrated by the accompanying drawings, which are not to be construed as limiting the application in any way.
FIG. 1 is a process flow diagram of a process for preparing a low-carbon magnesia carbon brick for producing stainless steel by a converter.
Fig. 2 is a process flow chart of step S3 of a process for preparing a low-carbon magnesia carbon brick for producing stainless steel by a converter.
Detailed Description
The application will be further described with reference to the following examples.
Example 1.
As shown in figures 1-2, the low-carbon magnesia carbon brick for producing stainless steel in a converter and the preparation process thereof are characterized in that the raw materials comprise 20-25% of large-crystal magnesia with the granularity of 3-5 mm, 25-30% of large-crystal magnesia with the granularity of 1-3 mm, 17-23% of large-crystal magnesia with the granularity of 0-1 mm, 15-20% of large-crystal magnesia with the granularity of less than 0.088mm, 9% of graphite with the grade of not less than-194, 4% of premix and 3-4% of phenolic resin.
The premix accounting for 4 percent of the low-carbon magnesia carbon brick consists of 0.3 percent of large-crystal magnesia with the granularity of 0mm-1mm, 2 percent of metal aluminum powder, 0.5 percent of metal silicon powder, 1 percent of asphalt powder and 0.2 percent of resin powder.
The low-carbon magnesia carbon bricks are mainly used for steelmaking converters, and the best embodiment is selected by combining economical efficiency, carbon content and physicochemical indexes, wherein each batch of magnesia carbon bricks is produced by adopting 230Kg of large-crystal magnesia with the granularity of 3-5 mm, 270Kg of large-crystal magnesia with the granularity of 1-3 mm, 200Kg of large-crystal magnesia with the granularity of 0-1 mm, 170Kg of large-crystal magnesia with the granularity of less than 0.088mm, 90Kg of-194-grade graphite, 40Kg of premix and 30Kg of phenolic resin, and the premix comprises 3Kg of large-crystal magnesia with the granularity of 0-1 mm, 20Kg of metal aluminum powder, 5Kg of metal silicon powder, 10Kg of high-temperature asphalt powder and 2Kg of carbon-containing resin powder.
The large-crystal magnesia adopts large-crystal magnesia with MgO content more than 98%, the large-crystal magnesia with MgO content of 98% is used as the economic optimal selection, graphite is selected to be 194 grade graphite is used as the economic optimal selection, the physicochemical indexes are simultaneously satisfied, asphalt powder adopts high-temperature asphalt powder with softening point of 95-120 ℃, asphalt powder adopts high-temperature asphalt powder, the softening point of ring-ball method is 95-120 ℃, the physicochemical indexes required by the application are satisfied, resin powder adopts carbon-containing resin powder, the use of asphalt powder can be reduced, the introduction of impurities is reduced, the high-temperature performance of stainless steel of a steelmaking converter is improved, the phenolic resin adopts thermosetting phenolic resin, the thermosetting phenolic resin has strong infiltration capacity, good molding performance and high volume density and low porosity.
The preparation process of the stainless steel low-carbon magnesia carbon brick of the steelmaking converter comprises the following steps:
s1, crushing large magnesia with MgO content more than 98% into large crystallized magnesia with three granularities of 3mm-5mm, 1mm-3mm and 0mm-1 mm.
The 98% large crystallized magnesia is transported to a crushing workshop, the large magnesia is put into a jaw crusher, and crushed into various granularities (3 mm-5mm, 1mm-3mm, 0mm-1 mm) by a pair of rollers.
S2, grinding the large crystallized magnesia with the granularity of 0mm-1mm in the step S1 to the granularity of less than 0.088mm.
The large crystallized magnesite with the grain size of 0mm-1mm is transported to a milling workshop and is milled to the grain size of less than 0.088mm by using Raymond.
S3, mixing large-crystal magnesia with granularity of 3mm-5mm, 1mm-3mm, 0mm-1mm and less than 0.088mm with phenolic resin and premix at high speed.
S4, pressing and forming the pug after mixing.
S5, drying the formed green bricks.
The high-speed kneading in step S3 includes the steps of:
s31, placing large crystal magnesia with the granularity of 3mm-5mm, 1mm-3mm and 0mm-1mm into a high-speed mixer together, and then adding phenolic resin for mixing for 3-5 minutes.
S32, sequentially adding large-crystal magnesia, graphite and premix with granularity smaller than 0.088mm into a high-speed mixer, and mixing again for 8-10 minutes.
The temperature in step S3 is maintained between 45 ℃ and 50 ℃.
Ensuring that the temperature of the pug meets the molding and pressing conditions in the interval.
In the step S4, the mixed pug is pressed and molded by adopting a 1650 ton electric screw press.
The drying conditions in step S5 were constant temperature drying at 200℃for 10 hours.
After the drying is finished, sorting and packaging are carried out, so that the finished product of the stainless steel low-carbon magnesia carbon brick of the steelmaking converter is obtained.
Example 2.
The large-crystal magnesia of the raw materials of the low-carbon magnesia carbon brick for producing stainless steel by the converter in the embodiment is 98.5 percent large-crystal magnesia, the MgO content is high, the refractory effect is better than that of 98 percent large-crystal magnesia, but the raw material price is about 7500 yuan/ton, the cost is higher, and the brick is produced aiming at clients with higher requirements on refractory performance.
Example 3.
In this example, under the same conditions as the other components in example 1, the grade of the raw material graphite of the low-carbon magnesia carbon brick for producing stainless steel in a converter is-196 grade crystalline flake graphite, wherein the carbon content is higher, the impurity content is less, the fire-resistant effect is good, but the cost is about 5600 yuan/ton, the cost is higher, and the production is aimed at special-demand customers.
Example 4.
In the embodiment, under the condition that the components are the same as the other components in the embodiment 1, the raw materials of the low-carbon magnesia carbon brick for producing the stainless steel in the converter adopt carbon-containing resin powder to replace high-temperature asphalt powder, and the carbon-containing resin powder is added according to the original proportion, so that the introduction of impurities can be reduced, the high-temperature performance is improved, the cost of the scheme can be increased, and the low-carbon magnesia carbon brick is produced for customers with higher requirements on the high-temperature performance.
According to the application, the mixture ratio is carried out by large magnesia crystals with various different granularities, the mixture and the premix are mixed with a binder and the like for compression molding at high speed, so that the carbon source is optimized, the carbon content of the low-carbon magnesia carbon brick for producing stainless steel by a converter is reduced to be less than 6%, and the service life of the steelmaking converter is prolonged under the condition that other rational indexes are not influenced.
Finally, it should be noted that the above embodiments are only for illustrating the technical solution of the present application and not for limiting the scope of the present application, and although the present application has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions can be made to the technical solution of the present application without departing from the spirit and scope of the technical solution of the present application.
Claims (7)
1. A low-carbon magnesia carbon brick for producing stainless steel by a converter is characterized in that: the raw materials comprise 20% -25% of large-crystal magnesia with the granularity of 3mm-5mm, 25% -30% of large-crystal magnesia with the granularity of 1mm-3mm, 17% -23% of large-crystal magnesia with the granularity of 0mm-1mm, 15% -20% of large-crystal magnesia with the granularity of less than 0.088mm, 9% of graphite with the grade of not less than-194, 4% of premix and 3% -4% of phenolic resin;
the premix accounting for 4 percent of the low-carbon magnesia carbon brick consists of 0.3 percent of large crystal magnesia with the granularity of 0mm-1mm, 2 percent of metal aluminum powder, 0.5 percent of metal silicon powder, 1 percent of asphalt powder and 0.2 percent of resin powder.
2. The low-carbon magnesia carbon brick for producing stainless steel by using a converter and a preparation process thereof are characterized in that: the large-crystal magnesia adopts large-crystal magnesia with MgO content more than 98%, the asphalt powder adopts high-temperature asphalt powder with softening point of 95-120 ℃, the resin powder adopts carbon-containing resin powder, and the phenolic resin adopts thermosetting phenolic resin.
3. A process for preparing a low carbon magnesia carbon brick for producing stainless steel by a converter according to any one of claims 1-2, which is characterized in that: the preparation process comprises the following steps:
s1, crushing large magnesia with MgO content more than 98% into large crystallized magnesia with three granularities of 3mm-5mm, 1mm-3mm and 0mm-1 mm;
s2, grinding the large crystallized magnesia with the granularity of 0mm-1mm in the step S1 to the granularity of less than 0.088mm;
s3, carrying out high-speed mixing on large-crystal magnesia with the granularity of 3mm-5mm, 1mm-3mm, 0mm-1mm and less than 0.088mm, phenolic resin and premix;
s4, pressing and forming the mixed pug;
s5, drying the formed green bricks.
4. The process for preparing the low-carbon magnesia carbon brick for producing stainless steel by using the converter as claimed in claim 3, wherein the process comprises the following steps of: the high-speed kneading in step S3 includes the steps of:
s31, placing large crystal magnesia with the granularity of 3mm-5mm, 1mm-3mm and 0mm-1mm into a high-speed mixer together, and then adding phenolic resin for mixing for 3-5 minutes;
s32, sequentially adding large-crystal magnesia, graphite and premix with granularity smaller than 0.088mm into the high-speed mixer, and mixing again for 8-10 minutes.
5. The process for preparing the low-carbon magnesia carbon brick for producing stainless steel by using the converter according to claim 4, which is characterized by comprising the following steps: the temperature in step S3 is maintained between 45 ℃ and 50 ℃.
6. The process for preparing the low-carbon magnesia carbon brick for producing stainless steel by using the converter as claimed in claim 3, wherein the process comprises the following steps of: in the step S4, the mixed pug is pressed and molded by adopting a 1650 ton electric screw press.
7. The process for preparing the low-carbon magnesia carbon brick for producing stainless steel by using the converter as claimed in claim 3, wherein the process comprises the following steps of: the drying conditions in step S5 were constant temperature drying at 200℃for 10 hours.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311025636.7A CN117069480A (en) | 2023-08-15 | 2023-08-15 | Low-carbon magnesia carbon brick for producing stainless steel by converter and preparation process thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202311025636.7A CN117069480A (en) | 2023-08-15 | 2023-08-15 | Low-carbon magnesia carbon brick for producing stainless steel by converter and preparation process thereof |
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| CN117069480A true CN117069480A (en) | 2023-11-17 |
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| CN (1) | CN117069480A (en) |
Citations (10)
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| CN111807819A (en) * | 2020-09-01 | 2020-10-23 | 北京利尔高温材料股份有限公司 | High-strength high-erosion low-carbon magnesia carbon brick for smelting stainless steel and preparation method thereof |
| CN112250421A (en) * | 2020-09-28 | 2021-01-22 | 北京利尔高温材料股份有限公司 | Magnesia carbon brick for impact area of converter and preparation method thereof |
| CN116287534A (en) * | 2023-01-28 | 2023-06-23 | 马鞍山利尔开元新材料有限公司 | Low-carbon composite converter tapping hole brick and preparation method thereof |
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| CN101186515A (en) * | 2007-12-21 | 2008-05-28 | 杨红 | Ultra-low-carbon steel slag inclusion line magnesium-carbon brick and producing method thereof |
| CN101531533A (en) * | 2009-04-22 | 2009-09-16 | 济南鲁东耐火材料有限公司 | Low carbon magnesia carbon brick and preparation method thereof |
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