CN116854487A - Composition for furnace cover and application thereof - Google Patents
Composition for furnace cover and application thereof Download PDFInfo
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- CN116854487A CN116854487A CN202310837825.8A CN202310837825A CN116854487A CN 116854487 A CN116854487 A CN 116854487A CN 202310837825 A CN202310837825 A CN 202310837825A CN 116854487 A CN116854487 A CN 116854487A
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- heat treatment
- composition
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- furnace cover
- furnace
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- 239000000203 mixture Substances 0.000 title claims abstract description 39
- 239000000463 material Substances 0.000 claims abstract description 97
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 44
- 239000000377 silicon dioxide Substances 0.000 claims abstract description 22
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 claims abstract description 18
- 239000000292 calcium oxide Substances 0.000 claims abstract description 18
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 claims abstract description 18
- 239000011230 binding agent Substances 0.000 claims abstract description 15
- 238000000034 method Methods 0.000 claims abstract description 15
- 239000000853 adhesive Substances 0.000 claims abstract description 14
- 230000001070 adhesive effect Effects 0.000 claims abstract description 14
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims abstract description 9
- 238000010438 heat treatment Methods 0.000 claims description 69
- 229910052751 metal Inorganic materials 0.000 claims description 18
- 239000002184 metal Substances 0.000 claims description 18
- 235000012239 silicon dioxide Nutrition 0.000 claims description 14
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 claims description 11
- 238000002360 preparation method Methods 0.000 claims description 10
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 claims description 8
- 238000002844 melting Methods 0.000 claims description 8
- 230000008018 melting Effects 0.000 claims description 8
- 238000000465 moulding Methods 0.000 claims description 6
- 229910000147 aluminium phosphate Inorganic materials 0.000 claims description 4
- 238000007493 shaping process Methods 0.000 claims 1
- 239000002245 particle Substances 0.000 abstract description 13
- 239000012535 impurity Substances 0.000 abstract description 7
- 239000000843 powder Substances 0.000 abstract description 5
- 238000005260 corrosion Methods 0.000 abstract description 4
- 230000007797 corrosion Effects 0.000 abstract description 4
- 238000009826 distribution Methods 0.000 abstract description 3
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 5
- RGPUVZXXZFNFBF-UHFFFAOYSA-K diphosphonooxyalumanyl dihydrogen phosphate Chemical compound [Al+3].OP(O)([O-])=O.OP(O)([O-])=O.OP(O)([O-])=O RGPUVZXXZFNFBF-UHFFFAOYSA-K 0.000 description 5
- 239000007789 gas Substances 0.000 description 5
- 229910052744 lithium Inorganic materials 0.000 description 5
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
- 239000007788 liquid Substances 0.000 description 4
- 239000002893 slag Substances 0.000 description 4
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 3
- 239000011362 coarse particle Substances 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000007670 refining Methods 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- 238000003723 Smelting Methods 0.000 description 2
- 238000009833 condensation Methods 0.000 description 2
- 230000005494 condensation Effects 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 239000010419 fine particle Substances 0.000 description 2
- 239000012510 hollow fiber Substances 0.000 description 2
- 229910052749 magnesium Inorganic materials 0.000 description 2
- 239000011777 magnesium Substances 0.000 description 2
- 239000012528 membrane Substances 0.000 description 2
- 239000007769 metal material Substances 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 239000011651 chromium Substances 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000001036 glow-discharge mass spectrometry Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 238000004062 sedimentation Methods 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000005979 thermal decomposition reaction Methods 0.000 description 1
- 239000010936 titanium Substances 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 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
- C04B35/66—Monolithic refractories or refractory mortars, including those whether or not containing clay
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
- C04B35/10—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on aluminium oxide
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D1/00—Casings; Linings; Walls; Roofs
- F27D1/18—Door frames; Doors, lids, removable covers
- F27D1/1808—Removable covers
-
- 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
- C04B2235/34—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
- C04B2235/44—Metal salt constituents or additives chosen for the nature of the anions, e.g. hydrides or acetylacetonate
- C04B2235/447—Phosphates or phosphites, e.g. orthophosphate, hypophosphite
-
- 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
- C04B2235/50—Constituents or additives of the starting mixture chosen for their shape or used because of their shape or their physical appearance
- C04B2235/54—Particle size related information
- C04B2235/5418—Particle size related information expressed by the size of the particles or aggregates thereof
- C04B2235/5427—Particle size related information expressed by the size of the particles or aggregates thereof millimeter or submillimeter sized, i.e. larger than 0,1 mm
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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
- C04B2235/50—Constituents or additives of the starting mixture chosen for their shape or used because of their shape or their physical appearance
- C04B2235/54—Particle size related information
- C04B2235/5418—Particle size related information expressed by the size of the particles or aggregates thereof
- C04B2235/5436—Particle size related information expressed by the size of the particles or aggregates thereof micrometer sized, i.e. from 1 to 100 micron
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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
- C04B2235/60—Aspects relating to the preparation, properties or mechanical treatment of green bodies or pre-forms
- C04B2235/602—Making the green bodies or pre-forms by moulding
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- C—CHEMISTRY; METALLURGY
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- 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
- C04B2235/65—Aspects relating to heat treatments of ceramic bodies such as green ceramics or pre-sintered ceramics, e.g. burning, sintering or melting processes
- C04B2235/656—Aspects relating to heat treatments of ceramic bodies such as green ceramics or pre-sintered ceramics, e.g. burning, sintering or melting processes characterised by specific heating conditions during heat treatment
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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
- C04B2235/65—Aspects relating to heat treatments of ceramic bodies such as green ceramics or pre-sintered ceramics, e.g. burning, sintering or melting processes
- C04B2235/656—Aspects relating to heat treatments of ceramic bodies such as green ceramics or pre-sintered ceramics, e.g. burning, sintering or melting processes characterised by specific heating conditions during heat treatment
- C04B2235/6567—Treatment time
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Ceramic Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Furnace Housings, Linings, Walls, And Ceilings (AREA)
Abstract
The invention relates to a composition for a furnace cover and application thereof, wherein the composition for the furnace cover comprises the following components in percentage by mass: a base material and a binder; the mass of the adhesive is 10-15% of the mass of the base material; the base material comprises: 30-40% of coarse materials and 60-70% of fine materials; the granularity of the coarse material is 0.1-0.6mm; the granularity of the fine materials is less than or equal to 74 mu m; both the coarse and fine materials include alumina, silica, and calcium oxide. The composition for the furnace cover provided by the invention can ensure good bonding performance through the specific design of powder composition and particle distribution of the composition, improves the corrosion resistance of the obtained furnace cover, has a fire resistance temperature of more than 1500 ℃, and can avoid the introduction of impurity components in materials in the furnace in the use process.
Description
Technical Field
The invention relates to the field of metal smelting preparation, in particular to a composition for a furnace cover and application thereof.
Background
Currently, a metal material is usually melted into a liquid by high-temperature heating in a preparation process, and then cast to obtain a product, such as a high-purity metal material.
As disclosed in WO2021135398A1, a method for preparing high purity metallic lithium by vacuum thermal reduction method comprises the steps of: under the existence of a solvent and a catalyst, a vacuum thermal decomposition process is adopted to obtain unsaturated composite oxide; mixing the lithium vapor with a fluxing agent and a reducing agent according to a certain proportion, agglomerating, carrying out vacuum thermal reduction in a vacuum reduction furnace, obtaining high-purity metal gas by centrifugal sedimentation and micron ceramic dust removal of the obtained lithium vapor, controlling the condensation temperature and the condensation speed of the gas, removing metal impurities in the gas to purify the lithium vapor, and obtaining the high-purity metal lithium by adopting a rapid cooling technology.
CN211734443U discloses a device for preparing high-purity nitrogen by refining magnesium metal, which comprises a magnesium refining furnace, the magnesium refining furnace is provided with a furnace cover, the furnace cover is provided with an air inlet and an air outlet, the air inlet is communicated with a nitrogen outlet of a hollow fiber membrane, the hollow fiber membrane is provided with a gas inlet, the gas inlet is connected with an air compressor, and the device provided by the scheme has the advantages of simple structure, convenient use, improved working efficiency and reduced cost.
However, the furnace cover configured in the existing metal smelting furnace has the problems of slag falling, adhesion of molten metal, poor heat preservation performance, excessive high impurity content of molten metal and the like in the use process.
Disclosure of Invention
In view of the problems existing in the prior art, the invention aims to provide a composition for a furnace cover and application thereof, so as to solve the problems of slag falling, adhesion of molten metal, poor heat insulation performance, excessive impurity of molten metal and the like existing in the using process of the existing furnace cover.
To achieve the purpose, the invention adopts the following technical scheme:
in a first aspect, the present invention provides a composition for a furnace cover, comprising, in mass percent: a base material and a binder; the mass of the adhesive is 10-15% of the mass of the base material;
the base material comprises: 30-40% of coarse materials and 60-70% of fine materials;
the granularity of the coarse material is 0.1-0.6mm; the granularity of the fine materials is less than or equal to 74 mu m;
both the coarse and fine materials include alumina, silica, and calcium oxide.
According to the composition for the furnace cover, through the specific design of powder composition and particle distribution of the composition, good bonding performance can be ensured, the corrosion resistance of the obtained furnace cover is improved, the fire resistance temperature is up to more than 1500 ℃, the problem of slag falling of the furnace cover can be avoided in the use process, and therefore the purity of the obtained metal product is improved, and the preparation of high-purity or ultra-high-purity materials is facilitated.
In the invention, the purity of the high purity is more than or equal to 99.99 percent.
In the invention, the ultra-high purity is that the purity is more than 99.9999 percent.
As a preferable technical scheme of the invention, the coarse material comprises the following components in percentage by mass: 80-90% of alumina, 5-6% of silicon dioxide and the balance of calcium oxide.
Preferably, the fine materials comprise the following components in percentage by mass: 80-85% of aluminum oxide, 9-10% of silicon dioxide and the balance of calcium oxide.
In a preferred embodiment of the present invention, the binder is an inorganic phosphoric acid-based binder.
In a second aspect, the present invention provides a use of a composition for a furnace lid according to the first aspect, comprising the preparation of a furnace lid of a metal melting furnace using the composition for a furnace lid.
As a preferable technical scheme of the invention, the application comprises the steps of proportioning according to a formula, and then sequentially carrying out molding and heat treatment to obtain the furnace cover.
As a preferable technical scheme of the invention, the heat treatment comprises a first heat treatment, a second heat treatment and a third heat treatment which are sequentially carried out.
As a preferable technical scheme of the invention, the temperature of the first heat treatment is 100-120 ℃.
Preferably, the time of the first heat treatment is 1 to 1.5 hours.
As a preferable technical scheme of the invention, the temperature of the second heat treatment is 200-230 ℃.
Preferably, the second heat treatment is carried out for a period of 2 to 2.5 hours.
As a preferable technical scheme of the invention, the temperature of the third heat treatment is 400-450 ℃.
Preferably, the time of the third heat treatment is 1 to 1.2 hours.
As a preferable technical scheme of the invention, the application comprises the steps of proportioning according to a formula, and then sequentially carrying out molding and heat treatment to obtain a furnace cover;
the heat treatment comprises a first heat treatment, a second heat treatment and a third heat treatment which are sequentially carried out;
the temperature of the first heat treatment is 100-120 ℃; the time of the first heat treatment is 1-1.5h;
the temperature of the second heat treatment is 200-230 ℃; the second heat treatment time is 2-2.5h;
the temperature of the third heat treatment is 400-450 ℃; the time of the third heat treatment is 1-1.2h.
Compared with the prior art, the invention has the following beneficial effects:
the furnace cover composition provided by the invention is combined with the preparation process of the invention, and the obtained furnace cover has strong plasticity and can better attach to the equipment opening to enhance the equipment tightness; the obtained furnace cover product has the advantages of high bonding strength, high corrosion resistance, high fire resistance temperature up to 1500 ℃, small drying shrinkage and high-temperature residual shrinkage value, difficult cracking, no slag drop, and capability of effectively reducing the cooling speed and the oxidation speed of the surface of the metal liquid after use and preventing impurities from entering the liquid through an inlet to cause pollution.
Detailed Description
For a better illustration of the present invention, which is convenient for understanding the technical solution of the present invention, exemplary but non-limiting examples of the present invention are as follows:
the present example provides a composition for a furnace cover, comprising, in mass percent: a base material and a binder; the mass of the adhesive is 10-15% of the mass of the base material;
the base material comprises: 30-40% of coarse material and 60-70% of fine material, wherein the total of coarse material and fine material is 100%.
The granularity of the coarse material is 0.1-0.6mm; the granularity of the fine materials is less than or equal to 74 mu m;
both the coarse and fine materials include alumina, silica, and calcium oxide.
The binder may be 10 to 15% by mass of the binder, for example, 10%, 10.5%, 11%, 11.5%, 12%, 12.5%, 13%, 13.5%, 14%, 14.5% or 15% by mass, but is not limited to the values recited therein, and other values not recited therein are equally applicable.
Wherein the adhesive is an inorganic phosphoric acid adhesive, such as phosphoric acid or aluminum dihydrogen phosphate, which is commonly used in the art.
The coarse material in the composition for furnace cover is 30-40% by mass, for example, 30%, 30.5%, 31%, 31.5%, 32%, 32.5%, 33%, 33.5%, 34%, 34.5%, 35%, 35.5%, 36%, 36.5%, 37%, 37.5%, 38%, 38.5%, 39%, 39.5% or 40%, etc., but not limited to the listed values, and other non-listed values in this range are equally applicable.
The content of the fine materials in the composition for a furnace cover is 60 to 70% by mass, for example, 60%, 60.5%, 61%, 61.5%, 62%, 62.5%, 63%, 63.5%, 64%, 64.5%, 66%, 66.5%, 67%, 67.5%, 68%, 68.5%, 69%, 69.5% or 70%, etc., but the present invention is not limited to the values listed, and other values not listed in the range are equally applicable.
In this example, the particle size of the coarse and fine materials in the composition for a furnace cover refers to the aggregate of solid particles in the range, such as coarse particles having a particle size in the range of 0.1 to 0.6mm, refers to the aggregate of all particles in the range, such as aggregate of all particles in the range of 0.1 to 0.3mm, such as aggregate of all particles in the range of 0.2 to 0.5mm, such as aggregate of all particles in the range of 0.3 to 0.6mm, and the like; the particle size range of the fine particles may be selected based on coarse particles, for example, the fine particles may be aggregates of all particles within 32 to 74 μm, for example, aggregates of all particles less than or equal to 50 μm.
Specifically, the coarse material comprises the following components in percentage by mass: 80-90% of alumina, 5-6% of silicon dioxide and the balance of calcium oxide.
The alumina content in the coarse material is 80-90% by mass, for example 80%, 81%, 82%, 83%, 84%, 85%, 86%, 87%, 88%, 89% or 90%, etc., but is not limited to the values listed, and other values not listed in the range are equally applicable.
Wherein the silica content in the coarse material is 5-6% by mass, for example, 5%, 5.1%, 5.2%, 5.3%, 5.4%, 5.5%, 5.6%, 5.7%, 5.8%, 5.9% or 6%, etc., but not limited to the listed values, and other non-listed values in the range are equally applicable.
Specifically, the fine materials comprise the following components in percentage by mass: 80-85% of aluminum oxide, 9-10% of silicon dioxide and the balance of calcium oxide.
Wherein the alumina content of the fine material is 80-85% by mass, for example 80%, 80.5%, 81%, 81.5%, 82%, 82.5%, 83%, 83.5%, 84%, 84.5% or 85%, etc., but not limited to the recited values, and other non-recited values within the range are equally applicable.
Wherein the silica content of the fine material is 9-10% by mass, for example, 9%, 9.1%, 9.2%, 9.3%, 9.4%, 9.5%, 9.6%, 9.7%, 9.8%, 9.9% or 10%, etc., but not limited to the listed values, other non-listed values within the range are equally applicable.
Further, according to the invention, the composition for the furnace cover is obtained by mixing the corresponding fine material and coarse material oxides with the binder according to the formula.
The above-mentioned composition for a furnace cover may be used in a specific range for preparing a furnace cover of a metal melting furnace using the composition for a furnace cover, and the melting furnace may be a high-temperature furnace for melting metal, such as an electric furnace, etc.
The specific process is as follows:
and (3) proportioning according to the formula, and then sequentially carrying out molding and heat treatment to obtain the furnace cover.
Wherein, the powder materials of the oxides can be selected to be directly mixed in the process of proportioning, and a certain amount of water such as 4-6% of the total mass of the powder materials is additionally added so as to facilitate the subsequent molding; the molding is carried out by adopting a mold, and the mold is matched and corresponds to the corresponding melting furnace mouth, so that the obtained furnace cover can be matched with the furnace mouth, the sealing performance in the furnace can be ensured in use, and the influence of oxidation on products is avoided. If the crucible furnace mouth launder is used as a mould to carry out new tool plasticity, the sealing mouth can be better attached, the gap is reduced, and the air tightness is enhanced. Further, in the forming process, steel wires can be embedded to serve as a framework to strengthen strength, handles can be embedded at the same time, people can conveniently place and take out tools, and people can be prevented from being scalded.
Specifically, the heat treatment includes a first heat treatment, a second heat treatment, and a third heat treatment that are sequentially performed.
Specifically, the temperature of the first heat treatment is 100-120deg.C, and may be, for example, 100deg.C, 101 deg.C, 102 deg.C, 103 deg.C, 104 deg.C, 105 deg.C, 106 deg.C, 107 deg.C, 108 deg.C, 109 deg.C, 110 deg.C, 111 deg.C, 112 deg.C, 113 deg.C, 114 deg.C, 115 deg.C, 116 deg.C, 117 deg.C, 118 deg.C, 119 deg.C or 120 deg.C, but are not limited to, the recited values, and other non-recited values within this range are equally applicable.
Specifically, the time of the first heat treatment is 1 to 1.5h, for example, 1h, 1.02h, 1.04h, 1.06h, 1.08h, 1.1h, 1.12h, 1.14h, 1.16h, 1.18h, 1.2h, 1.22h, 1.24h, 1.26h, 1.28h, 1.3h, 1.32h, 1.34h, 1.36h, 1.38h, 1.4h, 1.42h, 1.44h, 1.46h, 1.48h or 1.5h, etc., but not limited to the values listed, other non-listed values within this range are equally applicable.
Specifically, the temperature of the second heat treatment is 200 to 230 ℃, and may be 200 ℃, 202 ℃, 204 ℃, 206 ℃, 208 ℃, 210 ℃, 212 ℃, 214 ℃, 216 ℃, 218 ℃, 220 ℃, 222 ℃, 224 ℃, 226 ℃, 228 ℃, 230 ℃, or the like, for example, but not limited to the values listed, and other values not listed in the range are equally applicable.
Specifically, the time of the second heat treatment is 2-2.5h, for example, 2h, 2.02h, 2.04h, 2.06h, 2.08h, 2.1h, 2.12h, 2.14h, 2.16h, 2.18h, 2.2h, 2.22h, 2.24h, 2.26h, 2.28h, 2.3h, 2.32h, 2.34h, 2.36h, 2.38h, 2.4h, 2.42h, 2.44h, 2.46h, 2.48h or 2.5h, etc., but not limited to the listed values, and other values not listed in the range are equally applicable.
Specifically, the temperature of the third heat treatment is 400 to 450 ℃, for example, 400 ℃, 402 ℃, 404 ℃, 406 ℃, 408 ℃, 410 ℃, 412 ℃, 414 ℃, 416 ℃, 418 ℃, 420 ℃, 422 ℃, 424 ℃, 426 ℃, 428 ℃, 430 ℃, 432 ℃, 434 ℃, 436 ℃, 438 ℃, 440 ℃, 442 ℃, 444 ℃, 446 ℃, 448 ℃, 450 ℃, or 450 ℃, etc., but the temperature is not limited to the above-mentioned values, and other values not mentioned in the above range are equally applicable.
Specifically, the time of the third heat treatment is 1 to 1.2h, for example, 1h, 1.01h, 1.02h, 1.03h, 1.04h, 1.05h, 1.06h, 1.07h, 1.08h, 1.09h, 1.1h, 1.11h, 1.12h, 1.13h, 1.14h, 1.15h, 1.16h, 1.17h, 1.18h, 1.19h, or 1.2h, etc., but not limited to the listed values, and other non-listed values within the range are equally applicable.
The actual implementation process is as follows:
example 1
The embodiment provides a composition for a furnace cover, which comprises the following components in percentage by mass: a base material and a binder; the mass of the adhesive is 12% of the mass of the base material;
the base material comprises: 33% of coarse material and 67% of fine material;
the granularity of the coarse material is 0.3-0.4mm;
the granularity of the fine materials is less than or equal to 74 mu m;
the coarse material comprises the following components in percentage by mass: 87% of aluminum oxide, 5.4% of silicon dioxide and the balance of calcium oxide;
the fine materials comprise the following components in percentage by mass: 83% of aluminum oxide, 9.6% of silicon dioxide and the balance of calcium oxide;
the adhesive is aluminum dihydrogen phosphate.
Example 2
The embodiment provides a composition for a furnace cover, which comprises the following components in percentage by mass: a base material and a binder; the mass of the adhesive is 13% of the mass of the base material;
the base material comprises: 36% of coarse material and 64% of fine material;
the granularity of the coarse material is 0.1-0.5mm;
the granularity of the fine materials is 32-74 mu m;
the coarse material comprises the following components in percentage by mass: 83% of aluminum oxide, 5.7% of silicon dioxide and the balance of calcium oxide;
the fine materials comprise the following components in percentage by mass: 81% of alumina, 9.3% of silicon dioxide and the balance of calcium oxide;
the adhesive is aluminum dihydrogen phosphate.
Example 3
The embodiment provides a composition for a furnace cover, which comprises the following components in percentage by mass: a base material and a binder; the mass of the adhesive is 10% of the mass of the base material;
the base material comprises: 30% of coarse material and 70% of fine material;
the granularity of the coarse material is 0.3-0.6mm;
the granularity of the fine materials is less than or equal to 74 mu m;
the coarse material comprises the following components in percentage by mass: 80% of aluminum oxide, 6% of silicon dioxide and the balance of calcium oxide;
the fine materials comprise the following components in percentage by mass: 85% of aluminum oxide, 10% of silicon dioxide and the balance of calcium oxide;
the adhesive is aluminum dihydrogen phosphate.
Example 4
The embodiment provides a composition for a furnace cover, which comprises the following components in percentage by mass: a base material and a binder; the mass of the adhesive is 15% of the mass of the base material;
the base material comprises: 40% of coarse material and 60% of fine material;
the granularity of the coarse material is 0.2-0.5mm;
the granularity of the fine materials is 15-74 mu m;
the coarse material comprises the following components in percentage by mass: 90% of aluminum oxide, 5% of silicon dioxide and the balance of calcium oxide;
the fine materials comprise the following components in percentage by mass: 80% of aluminum oxide, 9% of silicon dioxide and the balance of calcium oxide;
the adhesive is aluminum dihydrogen phosphate.
Example 5
The only difference from example 1 is that the fines were replaced by an equal amount of coarse material.
Example 6
The only difference from example 1 is that the coarse material is replaced by an equal amount of fine material.
Example 7
The only difference from example 1 is that the content of silica in the fines was 5.4%.
Example 8
The difference from example 1 is only that the silica content in the coarse particles is 9.6%.
Example 9
The only difference from example 1 is that the percentage of coarse and fine material is replaced, i.e. 33% fine material and 67% coarse material.
Application example 1
The composition for furnace covers provided in the above examples 1 to 9 was used for preparing furnace covers, and specifically comprises: batching according to the formula, and then sequentially forming and heat treating to obtain a furnace cover;
the heat treatment comprises a first heat treatment, a second heat treatment and a third heat treatment which are sequentially carried out;
the temperature of the first heat treatment is 110 ℃; the time of the first heat treatment is 1.2h;
the temperature of the second heat treatment is 215 ℃; the time of the second heat treatment is 2.2h;
the temperature of the third heat treatment is 425 ℃; the time of the third heat treatment is 1.1h.
Application example 2
The difference from application example 1 was only that the first heat treatment time was prolonged by 2.2 hours during the preparation for the composition for a furnace cover in example 1.
Application example 3
The difference from application example 1 was only that the third heat treatment time was prolonged by 2.2 hours during the preparation for the composition for a furnace cover in example 1.
Application example 4
The difference from application example 1 was only that the time for shortening the second heat treatment during the preparation was 1.2 hours for the composition for a furnace cover in example 1.
The furnace cover obtained in the application example is used in electric furnace melting, the melting object is high purity metal aluminum with purity of 99.999%, sampling is carried out after the material is melted, and the concentration of impurities in the sample is detected by adopting GDMS/OES, wherein the impurities comprise iron, nickel, chromium and titanium, and the details are shown in Table 1.
TABLE 1
According to the results of the embodiment, the composition for the furnace cover can ensure good bonding performance through the specific design of powder composition and particle distribution of the composition, improves the corrosion resistance of the obtained furnace cover, ensures the stability of the furnace cover in the high-temperature use process, obviously reduces the deformation of the furnace cover at high temperature, is beneficial to prolonging the service life of the furnace cover, obviously reduces the metal liquid pollution caused by the material dropping problem of the furnace cover in the use process, and is beneficial to the efficient preparation of ultra-high-purity metal.
It is stated that the detailed structural features of the present invention are described by the above embodiments, but the present invention is not limited to the above detailed structural features, i.e., it does not mean that the present invention must be implemented depending on the above detailed structural features. It should be apparent to those skilled in the art that any modifications of the present invention, equivalent substitutions of selected components of the present invention, addition of auxiliary components, selection of specific modes, etc., are within the scope of the present invention and the scope of the disclosure.
The preferred embodiments of the present invention have been described in detail above, but the present invention is not limited to the specific details of the above embodiments, and various simple modifications can be made to the technical solution of the present invention within the scope of the technical concept of the present invention, and all the simple modifications belong to the protection scope of the present invention.
In addition, the specific features described in the above embodiments may be combined in any suitable manner, and in order to avoid unnecessary repetition, various possible combinations are not described further.
Moreover, any combination of the various embodiments of the invention can be made without departing from the spirit of the invention, which should also be considered as disclosed herein.
Claims (10)
1. The composition for the furnace cover is characterized by comprising the following components in percentage by mass: a base material and a binder; the mass of the adhesive is 10-15% of the mass of the base material;
the base material comprises: 30-40% of coarse materials and 60-70% of fine materials;
the granularity of the coarse material is 0.1-0.6mm; the granularity of the fine materials is less than or equal to 74 mu m;
both the coarse and fine materials include alumina, silica, and calcium oxide.
2. The composition for a furnace cover according to claim 1, wherein the coarse material comprises, in mass percent: 80-90% of aluminum oxide, 5-6% of silicon dioxide and the balance of calcium oxide;
preferably, the fine materials comprise the following components in percentage by mass: 80-85% of aluminum oxide, 9-10% of silicon dioxide and the balance of calcium oxide.
3. The composition for a furnace cover according to claim 1 or 2, wherein the binder is an inorganic phosphoric acid-based binder.
4. Use of a composition for a furnace lid according to any one of claims 1 to 3, characterized in that it comprises the preparation of a furnace lid of a metal melting furnace using said composition for a furnace lid.
5. The method according to claim 4, wherein the method comprises the steps of proportioning according to a formula, and then sequentially carrying out molding and heat treatment to obtain the furnace cover.
6. The use according to claim 5, wherein the heat treatment comprises a first heat treatment, a second heat treatment and a third heat treatment performed sequentially.
7. The use according to claim 6, wherein the temperature of the first heat treatment is 100-120 ℃;
preferably, the time of the first heat treatment is 1 to 1.5 hours.
8. Use according to claim 6 or 7, wherein the temperature of the second heat treatment is 200-230 ℃;
preferably, the second heat treatment is carried out for a period of 2 to 2.5 hours.
9. Use according to any one of claims 6 to 8, wherein the temperature of the third heat treatment is 400 to 450 ℃;
preferably, the time of the third heat treatment is 1 to 1.2 hours.
10. Use according to any one of claims 6 to 9, characterized in that it comprises dosing according to a recipe, followed by a subsequent shaping and heat treatment, obtaining a furnace lid;
the heat treatment comprises a first heat treatment, a second heat treatment and a third heat treatment which are sequentially carried out;
the temperature of the first heat treatment is 100-120 ℃; the time of the first heat treatment is 1-1.5h;
the temperature of the second heat treatment is 200-230 ℃; the second heat treatment time is 2-2.5h;
the temperature of the third heat treatment is 400-450 ℃; the time of the third heat treatment is 1-1.2h.
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