CN114409384A - Preparation method for producing carbon-free brick by using alumina particles as raw material - Google Patents
Preparation method for producing carbon-free brick by using alumina particles as raw material Download PDFInfo
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- CN114409384A CN114409384A CN202111384412.6A CN202111384412A CN114409384A CN 114409384 A CN114409384 A CN 114409384A CN 202111384412 A CN202111384412 A CN 202111384412A CN 114409384 A CN114409384 A CN 114409384A
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- alumina
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- magnesium
- corundum
- white corundum
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- 239000002245 particle Substances 0.000 title claims abstract description 64
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 title claims abstract description 59
- 239000011449 brick Substances 0.000 title claims abstract description 55
- 239000002994 raw material Substances 0.000 title claims abstract description 38
- 238000002360 preparation method Methods 0.000 title claims abstract description 18
- CPLXHLVBOLITMK-UHFFFAOYSA-N Magnesium oxide Chemical compound [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 claims abstract description 115
- 239000010431 corundum Substances 0.000 claims abstract description 82
- 239000000395 magnesium oxide Substances 0.000 claims abstract description 80
- 229910052593 corundum Inorganic materials 0.000 claims abstract description 73
- 239000000843 powder Substances 0.000 claims abstract description 39
- 239000011029 spinel Substances 0.000 claims abstract description 35
- 229910052596 spinel Inorganic materials 0.000 claims abstract description 30
- 229910052749 magnesium Inorganic materials 0.000 claims abstract description 28
- 239000011777 magnesium Substances 0.000 claims abstract description 28
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 claims abstract description 18
- SNAAJJQQZSMGQD-UHFFFAOYSA-N aluminum magnesium Chemical compound [Mg].[Al] SNAAJJQQZSMGQD-UHFFFAOYSA-N 0.000 claims abstract description 18
- 239000007767 bonding agent Substances 0.000 claims abstract description 18
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 11
- 238000000034 method Methods 0.000 claims abstract description 9
- MXRIRQGCELJRSN-UHFFFAOYSA-N O.O.O.[Al] Chemical compound O.O.O.[Al] MXRIRQGCELJRSN-UHFFFAOYSA-N 0.000 claims abstract description 6
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 claims description 44
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 claims description 20
- 239000011230 binding agent Substances 0.000 claims description 18
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 10
- -1 magnesium aluminate Chemical class 0.000 claims description 10
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 claims description 10
- 239000001095 magnesium carbonate Substances 0.000 claims description 6
- 235000014380 magnesium carbonate Nutrition 0.000 claims description 6
- ZLNQQNXFFQJAID-UHFFFAOYSA-L magnesium carbonate Chemical compound [Mg+2].[O-]C([O-])=O ZLNQQNXFFQJAID-UHFFFAOYSA-L 0.000 claims description 6
- 229910000021 magnesium carbonate Inorganic materials 0.000 claims description 6
- 230000032683 aging Effects 0.000 claims description 5
- 238000007605 air drying Methods 0.000 claims description 5
- 238000000748 compression moulding Methods 0.000 claims description 5
- 238000001816 cooling Methods 0.000 claims description 5
- 238000001035 drying Methods 0.000 claims description 5
- 238000010438 heat treatment Methods 0.000 claims description 5
- 238000002156 mixing Methods 0.000 claims description 5
- 238000005303 weighing Methods 0.000 claims description 5
- 230000035939 shock Effects 0.000 abstract description 10
- 230000003647 oxidation Effects 0.000 abstract description 8
- 238000007254 oxidation reaction Methods 0.000 abstract description 8
- 238000004519 manufacturing process Methods 0.000 abstract description 7
- 238000003723 Smelting Methods 0.000 abstract description 6
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 13
- 229910052799 carbon Inorganic materials 0.000 description 12
- 239000002893 slag Substances 0.000 description 6
- 239000011819 refractory material Substances 0.000 description 5
- 229910000831 Steel Inorganic materials 0.000 description 4
- 239000010959 steel Substances 0.000 description 4
- 229910000838 Al alloy Inorganic materials 0.000 description 2
- 229920002748 Basalt fiber Polymers 0.000 description 2
- 239000002253 acid Substances 0.000 description 2
- CSDREXVUYHZDNP-UHFFFAOYSA-N alumanylidynesilicon Chemical compound [Al].[Si] CSDREXVUYHZDNP-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 239000002131 composite material Substances 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 230000003628 erosive effect Effects 0.000 description 2
- 230000005496 eutectics Effects 0.000 description 2
- 238000005245 sintering Methods 0.000 description 2
- 238000009628 steelmaking Methods 0.000 description 2
- WNROFYMDJYEPJX-UHFFFAOYSA-K aluminium hydroxide Chemical class [OH-].[OH-].[OH-].[Al+3] WNROFYMDJYEPJX-UHFFFAOYSA-K 0.000 description 1
- 239000003963 antioxidant agent Substances 0.000 description 1
- 239000003575 carbonaceous material Substances 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 229910002804 graphite Inorganic materials 0.000 description 1
- 239000010439 graphite Substances 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 231100000252 nontoxic Toxicity 0.000 description 1
- 230000003000 nontoxic effect Effects 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 229910001845 yogo sapphire Inorganic materials 0.000 description 1
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- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
- C04B35/10—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on aluminium oxide
- C04B35/101—Refractories from grain sized mixtures
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- 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
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- 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
- C04B35/626—Preparing or treating the powders individually or as batches ; preparing or treating macroscopic reinforcing agents for ceramic products, e.g. fibres; mechanical aspects section B
- C04B35/63—Preparing or treating the powders individually or as batches ; preparing or treating macroscopic reinforcing agents for ceramic products, e.g. fibres; mechanical aspects section B using additives specially adapted for forming the products, e.g.. binder binders
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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
- C04B2235/32—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
- C04B2235/3206—Magnesium oxides or oxide-forming salts thereof
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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
- C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
- C04B2235/3217—Aluminum oxide or oxide forming salts thereof, e.g. bauxite, alpha-alumina
- C04B2235/3222—Aluminates other than alumino-silicates, e.g. spinel (MgAl2O4)
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- C04B2235/54—Particle size related information
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Abstract
The invention provides a preparation method for producing a carbon-free brick by using alumina particles as raw materials. The preparation method for manufacturing the carbon-free brick by using the alumina particles as the raw materials comprises the following steps: the method comprises the following steps: (1) preparing raw materials: alumina, tabular corundum, white corundum, fused magnesia, white corundum micro powder, aluminum-magnesium spinel fine powder, a bonding agent and water; (2) the alumina particles are 3-5mm, the tabular corundum particles are 1-5mm, the white corundum particles are 0.1-1mm, the fused magnesia particles are 0.1-1mm, the magnesia alumina spinel fine powder particles are less than or equal to 0.088mm, and the bonding agent particles are less than or equal to 0.044 mm. The preparation method for manufacturing the carbon-free brick by using the alumina particles as the raw material has the advantages of good oxidation resistance, acid-base and thermal shock stability, capability of meeting smelting requirements, and capability of avoiding harm to a human body by using the magnesium gel as a bonding agent.
Description
Technical Field
The invention belongs to the technical field of refractory materials, and particularly relates to a preparation method for producing a carbon-free brick by using alumina particles as raw materials.
Background
The melting point of the magnesium oxide is 2800 ℃, and the magnesium oxide has strong high temperature resistance, but the thermal shock resistance and the slag penetration resistance are poor; the carbon material represented by graphite also has strong high temperature resistance, low thermal expansion coefficient and excellent thermal shock resistance, is not easy to be infiltrated with molten steel and steel slag at high temperature, and is compounded according to a certain proportion to form the refractory material-magnesia carbon brick with good comprehensive performance. The magnesia carbon brick is mainly used for steel-making refractory materials, such as a converter, a steel-making electric furnace and a ladle, and discloses a magnesia carbon brick and a preparation method thereof in the related technology, belonging to the technical field of refractory material preparation. The high-temperature-resistant high-temperature-resistant medium comprises 60-75 parts of fused magnesia particles, 10-30 parts of fused magnesia fine powder, 5-10 parts of carbon, 1-5 parts of eutectic silicon-aluminum alloy powder, 1-3 parts of basalt fiber and 1-3 parts of binding agent; the raw materials are weighed according to a proportion and then fully mixed, then are pressed and formed, and finally are baked to obtain the magnesia carbon brick. The preparation method is simple, the steps are easy to operate, the eutectic silicon-aluminum alloy powder and the basalt fiber are applied to the magnesia carbon brick, the strength, the erosion resistance and the oxidation resistance of a matrix part are improved, meanwhile, the use of metal antioxidants is greatly reduced, and the service life of the magnesia carbon brick is prolonged.
However, the above structure has a disadvantage that in the magnesia carbon brick, carbon exists to prevent slag from eroding into the brick, and the carbon itself has a characteristic of easy oxidation, when the carbon in the magnesia carbon brick is oxidized, the surface is more easily oxidized and decarburized, so that sintering is generated between refractory material components, and the thermal shock stability is significantly reduced.
Therefore, there is a need to provide a new method for producing carbon-free bricks from alumina particles
Disclosure of Invention
The invention aims to provide a preparation method for manufacturing a carbon-free brick by using alumina particles as raw materials, which has good oxidation resistance, acid-base and thermal shock stability so as to meet smelting requirements, and can avoid harm to human bodies by using magnesium gel as a binding agent.
In order to solve the technical problems, the preparation method for producing the carbon-free brick by using the alumina particles as the raw materials comprises the following steps:
(1) preparing raw materials: alumina, tabular corundum, white corundum, fused magnesia, white corundum micro powder, aluminum-magnesium spinel fine powder, a bonding agent and water;
(2) the alumina particles are 3-5mm, the tabular corundum particles are 1-5mm, the white corundum particles are 0.1-1mm, the fused magnesia particles are 0.1-1mm, the magnesia alumina spinel fine powder particles are less than or equal to 0.088mm, and the bonding agent particles are less than or equal to 0.044 mm;
(3) aluminum oxide (Al) in the bauxite2O3) 88.4%, iron oxide (Fe) in the alumina2O3) Is 1.5%, and the density of the alumina is 3.15g cm-3；
(4) Alumina (Al) in the plate-like corundum2O3) The content of (A) is 98.9%, and the density of the tabular corundum is 3.54g cm-3；
(5) Alumina (Al) in the white corundum2O3) The content of the white corundum is 98.5 percent, and the density of the white corundum is 3.90g cm-3；
(6) The content of magnesium oxide (MgO) in the fused magnesite is 97.1%, and the density of the fused magnesite is 3.48 g-cm-3；
(7) Aluminum oxide (Al) in the aluminum magnesium spinel2O3) The percentage of magnesium oxide (MgO) in the magnesium aluminate spinel is 77.3 percent, and the percentage of magnesium oxide (MgO) in the magnesium aluminate spinel is 21.8 percent;
(8) the proportion of magnesium oxide (MgO) in the binder is 65.9%, and iron oxide (Fe) in the binder2O3) The content of (a) is 0.50%.
As a further scheme of the invention, the bonding agent is magnesium gel, the white corundum comprises white corundum micro powder, and the particle size of the white corundum micro powder is less than or equal to 0.088 mm.
As a further scheme of the invention, the formula proportion comprises the following components:
(1) the alumina and the tabular corundum account for 25% in total;
(2) the proportion of the fine white corundum and aluminum magnesium spinel powder is 41 percent;
(3) the proportion of the fused magnesia is 9 percent;
(4) the specific amount of the magnesium gel is 22.7 percent
(5) The proportion of water is 2.3%.
As a further aspect of the present invention, a molding, comprising the steps of:
(1) weighing the raw materials according to the proportion;
(2) putting the raw materials weighed in the step (1) into a stirrer for mixing for 30min, ageing for 2h, and finally performing compression molding at 150MPa by a hydraulic press to obtain a green brick;
(3) drying the green bricks obtained in the step (2) at the temperature of 180-240 ℃ for 24h, then preserving the heat for 3h for heat treatment, and finally taking out the green bricks after natural cooling and air drying so as to obtain the carbon-free bricks.
Compared with the prior art, the preparation method for manufacturing the carbon-free brick by using the alumina particles as the raw materials has the following beneficial effects:
the invention provides a preparation method for producing a carbon-free brick by using alumina particles as raw materials, which comprises the following steps:
1. has good oxidation resistance, acid-base and thermal shock stability, can meet smelting requirements, and can avoid harm to human bodies by taking magnesium gel as a binding agent.
Detailed Description
Example 1
A method for preparing a carbon-free brick by using alumina particles as raw materials comprises the following steps:
(1) preparing raw materials: alumina, tabular corundum, white corundum, fused magnesia, white corundum micro powder, aluminum-magnesium spinel fine powder, a bonding agent and water;
(2) the alumina particles are 3-5mm, the tabular corundum particles are 1-5mm, the white corundum particles are 0.1-1mm, the fused magnesia particles are 0.1-1mm, the magnesia alumina spinel fine powder particles are less than or equal to 0.088mm, and the bonding agent particles are less than or equal to 0.044 mm;
(3) aluminum oxide (Al) in the bauxite2O3) 88.4%, iron oxide (Fe) in the alumina2O3) Is 1.5%, and the density of the alumina is 3.15g cm-3；
By using alumina, the resistance to acid and alkaline slag corrosion can be improved, and the high-temperature strength is high, because alumina is a colloidal mixture composed of three aluminum hydroxides in different ratios, and is classified into a metallurgical grade, a chemical grade, a refractory grade, a grinding grade, a cement grade and the like according to the use thereof, and is used for manufacturing a refractory material, the resistance to acid and alkaline slag corrosion can be improved, and the high-temperature strength is high.
(4) Alumina (Al) in the plate-like corundum2O3) The content of (A) is 98.9%, and the density of the tabular corundum is 3.54g cm-3；
(5) Alumina (Al) in the white corundum2O3) The content of the white corundum is 98.5 percent, and the density of the white corundum is 3.90g cm-3；
(6) The content of magnesium oxide (MgO) in the fused magnesite is 97.1%, and the density of the fused magnesite is 3.48 g-cm-3；
The addition of the fused magnesia prevents the lining of the steel and the steel slag from corroding along brick joints in the using process of the ladle, and the carbon-free ladle brick is required to have a preset expansion rate in a high-temperature using state, so that a certain amount of magnesium oxide (MgO) and aluminum oxide (Al) in the magnesium oxide (MgO) can be added into the ladle brick2O3) The reaction to form magnesium aluminate spinel and the accompanying expansion.
(7) Aluminum oxide (Al) in the aluminum magnesium spinel2O3) The percentage of magnesium oxide (MgO) in the magnesium aluminate spinel is 77.3 percent, and the percentage of magnesium oxide (MgO) in the magnesium aluminate spinel is 21.8 percent;
by adding the fine powder of the magnesium aluminate spinel, the spinel can play a role of presetting a part of spinel, so that MgO (magnesium oxide) and Al2O3 (aluminum oxide) can react by taking the fine powder as a core in the using process to generate an MA-MA binding phase, thereby promoting sintering, and simultaneously, the addition of the fine powder of the spinel can also improve the thermal shock stability.
(8) The proportion of magnesium oxide (MgO) in the binder is 65.9%, and iron oxide (Fe) in the binder2O3) The content of (a) is 0.50%.
The carbon-free machine-pressing ladle brick has the advantage of low apparent porosity by adding the bonding agent magnesium gel, and the magnesium gel is a non-toxic environment-friendly bonding agent, so that the harm to a human body can be avoided.
The bonding agent is magnesium gel, the white corundum comprises white corundum micro powder, and the particle size of the white corundum micro powder is less than or equal to 0.088 mm.
The formula proportion comprises the following components:
(1) the alumina and the tabular corundum account for 25% in total;
(2) the proportion of the fine white corundum and aluminum magnesium spinel powder is 41 percent;
(3) the proportion of the fused magnesia is 9 percent;
(4) the specific amount of the magnesium gel is 22.7 percent
(5) The proportion of water is 2.3%.
Forming, the forming comprising the steps of:
(1) weighing the raw materials according to the proportion;
(2) putting the raw materials weighed in the step (1) into a stirrer for mixing for 30min, ageing for 2h, and finally performing compression molding at 150MPa by a hydraulic press to obtain a green brick;
(3) drying the green bricks obtained in the step (2) at the temperature of 180-240 ℃ for 24h, then preserving the heat for 3h for heat treatment, and finally taking out the green bricks after natural cooling and air drying so as to obtain the carbon-free bricks.
Compared with the prior art, the preparation method for manufacturing the carbon-free brick by using the alumina particles as the raw materials has the following beneficial effects:
the invention provides a preparation method for producing a carbon-free brick by using alumina particles as raw materials, which has good oxidation resistance and thermal shock stability so as to meet smelting requirements, and can avoid harm to human bodies by using magnesium gel as a binding agent.
Example 2
A method for preparing a carbon-free brick by using alumina particles as raw materials comprises the following steps:
(1) preparing raw materials: the alumina-based composite material comprises alumina, tabular corundum, white corundum, fused magnesia, white corundum micro powder, aluminum-magnesium spinel fine powder, a bonding agent and water, wherein the alumina particles are 3-5mm, the tabular corundum particles are 1-5mm, the white corundum particles are 0.1-1mm, the fused magnesia particles are 0.1-1mm, the aluminum-magnesium spinel fine powder particles are less than or equal to 0.088mm, the bonding agent particles are less than or equal to 0.044mm, and aluminum oxide (Al) in the alumina2O3) 88.4%, iron oxide (Fe) in the alumina2O3) Is 1.5%, and the density of the alumina is 3.15g cm-3Alumina (Al) in said plate corundum2O3) The content of (A) is 98.9%, and the density of the tabular corundum is 3.54g cm-3Alumina (Al) in said white corundum2O3) The content of the white corundum is 98.5 percent, and the density of the white corundum is 3.90g cm-3The proportion of magnesium oxide (MgO) in the fused magnesia is 97.1%, and the density of the fused magnesia is 3.48 g-cm-3Aluminum oxide (Al) in the aluminum magnesium spinel2O3) Is 77.3 percent, the magnesium oxide (MgO) in the magnesium aluminate spinel is 21.8 percent, the magnesium oxide (MgO) in the binding agent is 65.9 percent, and the iron oxide (Fe) in the binding agent2O3) The percentage of the white corundum is 0.50 percent, the binding agent is magnesium gel, the white corundum comprises white corundum micro powder, and the particle size of the white corundum micro powder is less than or equal to 0.088 mm.
The formula proportion comprises the following components:
(1) the alumina and the tabular corundum account for 30% in total;
(2) the proportion of the fine white corundum and aluminum magnesium spinel powder is 36 percent;
(3) the proportion of the fused magnesia is 6 percent in total;
(4) the specific weight of the magnesium gel is 25 percent
(5) The water is present in a proportion of 3%.
Forming, the forming comprising the steps of:
(1) weighing the raw materials according to the proportion;
(2) putting the raw materials weighed in the step (1) into a stirrer for mixing for 30min, ageing for 2h, and finally performing compression molding at 150MPa by a hydraulic press to obtain a green brick;
(3) drying the green bricks obtained in the step (2) at the temperature of 180-240 ℃ for 24h, then preserving the heat for 3h for heat treatment, and finally taking out the green bricks after natural cooling and air drying so as to obtain the carbon-free bricks.
The invention provides a preparation method for producing a carbon-free brick by using alumina particles as raw materials, which has good oxidation resistance and thermal shock stability so as to meet smelting requirements, and can avoid harm to human bodies by using magnesium gel as a binding agent.
Example 3
A method for preparing a carbon-free brick by using alumina particles as raw materials comprises the following steps:
(1) preparing raw materials: the alumina-based composite material comprises alumina, tabular corundum, white corundum, fused magnesia, white corundum micro powder, aluminum-magnesium spinel fine powder, a bonding agent and water, wherein the alumina particles are 3-5mm, the tabular corundum particles are 1-5mm, the white corundum particles are 0.1-1mm, the fused magnesia particles are 0.1-1mm, the aluminum-magnesium spinel fine powder particles are less than or equal to 0.088mm, the bonding agent particles are less than or equal to 0.044mm, and aluminum oxide (Al) in the alumina2O3) 88.4%, iron oxide (Fe) in the alumina2O3) Is 1.5%, and the density of the alumina is3.15g·cm-3Alumina (Al) in said plate corundum2O3) The content of (A) is 98.9%, and the density of the tabular corundum is 3.54g cm-3Alumina (Al) in said white corundum2O3) The content of the white corundum is 98.5 percent, and the density of the white corundum is 3.90g cm-3The proportion of magnesium oxide (MgO) in the fused magnesia is 97.1%, and the density of the fused magnesia is 3.48 g-cm-3Aluminum oxide (Al) in the aluminum magnesium spinel2O3) Is 77.3 percent, the magnesium oxide (MgO) in the magnesium aluminate spinel is 21.8 percent, the magnesium oxide (MgO) in the binding agent is 65.9 percent, and the iron oxide (Fe) in the binding agent2O3) The percentage of the white corundum is 0.50 percent, the binding agent is magnesium gel, the white corundum comprises white corundum micro powder, and the particle size of the white corundum micro powder is less than or equal to 0.088 mm.
The formula proportion comprises the following components:
(1) the alumina and the tabular corundum account for 40 percent in total;
(2) the proportion of the fine white corundum and aluminum magnesium spinel powder is 30 percent;
(3) the proportion of the fused magnesia is 8 percent in total;
(4) the specific weight of the magnesium gel is 20 percent
(5) The water is present in a proportion of 2%.
Forming, the forming comprising the steps of:
(1) weighing the raw materials according to the proportion;
(2) putting the raw materials weighed in the step (1) into a stirrer for mixing for 30min, ageing for 2h, and finally performing compression molding at 150MPa by a hydraulic press to obtain a green brick;
(3) drying the green bricks obtained in the step (2) at the temperature of 180-240 ℃ for 24h, then preserving the heat for 3h for heat treatment, and finally taking out the green bricks after natural cooling and air drying so as to obtain the carbon-free bricks.
The invention provides a preparation method for producing a carbon-free brick by using alumina particles as raw materials, which has good oxidation resistance and thermal shock stability so as to meet smelting requirements, and can avoid harm to human bodies by using magnesium gel as a binding agent.
Claims (4)
1. A preparation method for producing a carbon-free brick by using alumina particles as raw materials is characterized by comprising the following steps:
(1) preparing raw materials: alumina, tabular corundum, white corundum, fused magnesia, white corundum micro powder, aluminum-magnesium spinel fine powder, a bonding agent and water;
(2) the alumina particles are 3-5mm, the tabular corundum particles are 1-5mm, the white corundum particles are 0.1-1mm, the fused magnesia particles are 0.1-1mm, the magnesia alumina spinel fine powder particles are less than or equal to 0.088mm, and the bonding agent particles are less than or equal to 0.044 mm;
(3) aluminum oxide (Al) in the bauxite2O3) 88.4%, iron oxide (Fe) in the alumina2O3) Is 1.5%, and the density of the alumina is 3.15g cm-3；
(4) Alumina (Al) in the plate-like corundum2O3) The content of (A) is 98.9%, and the density of the tabular corundum is 3.54g cm-3；
(5) Alumina (Al) in the white corundum2O3) The content of the white corundum is 98.5 percent, and the density of the white corundum is 3.90g cm-3；
(6) The content of magnesium oxide (MgO) in the fused magnesite is 97.1%, and the density of the fused magnesite is 3.48 g-cm-3；
(7) Aluminum oxide (Al) in the aluminum magnesium spinel2O3) The percentage of magnesium oxide (MgO) in the magnesium aluminate spinel is 77.3 percent, and the percentage of magnesium oxide (MgO) in the magnesium aluminate spinel is 21.8 percent;
(8) the proportion of magnesium oxide (MgO) in the binder is 65.9%, and iron oxide (Fe) in the binder2O3) The content of (a) is 0.50%.
2. The method for preparing the carbon-free brick by using the alumina particles as the raw material according to claim 1, wherein the bonding agent is magnesium gel, the white corundum comprises white corundum micro powder, and the particles of the white corundum micro powder are less than or equal to 0.088 mm.
3. The method for preparing the carbon-free brick by using the alumina particles as the raw materials according to claim 1, wherein the formula comprises the following components in percentage by weight:
(1) the alumina and the tabular corundum account for 25% in total;
(2) the proportion of the fine white corundum and aluminum magnesium spinel powder is 41 percent;
(3) the proportion of the fused magnesia is 9 percent;
(4) the specific amount of the magnesium gel is 22.7 percent
(5) The proportion of water is 2.3%.
4. The method for preparing a carbon-free brick from alumina particles as a raw material according to claim 1, wherein the forming comprises the following steps:
(1) weighing the raw materials according to the proportion;
(2) putting the raw materials weighed in the step (1) into a stirrer for mixing for 30min, ageing for 2h, and finally performing compression molding at 150MPa by a hydraulic press to obtain a green brick;
(3) drying the green bricks obtained in the step (2) at the temperature of 180-240 ℃ for 24h, then preserving the heat for 3h for heat treatment, and finally taking out the green bricks after natural cooling and air drying so as to obtain the carbon-free bricks.
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