CN108285339A - A kind of foam-formed technique of light-weight refractory prefabricated component - Google Patents

A kind of foam-formed technique of light-weight refractory prefabricated component Download PDF

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Publication number
CN108285339A
CN108285339A CN201810143503.2A CN201810143503A CN108285339A CN 108285339 A CN108285339 A CN 108285339A CN 201810143503 A CN201810143503 A CN 201810143503A CN 108285339 A CN108285339 A CN 108285339A
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prefabricated component
light
castable
technique
foam
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张会敏
张景倚
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ZHENGZHOU YUFENG REFRACTORY MATERIALS CO Ltd
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ZHENGZHOU YUFENG REFRACTORY MATERIALS CO Ltd
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    • C04B35/00Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/01Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
    • C04B35/10Shaped 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
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    • C04B35/00Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/01Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
    • C04B35/44Shaped 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 aluminates
    • C04B35/443Magnesium aluminate spinel
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    • C04B35/66Monolithic refractories or refractory mortars, including those whether or not containing clay
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    • C04B38/02Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof by adding chemical blowing agents
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    • C04B2235/00Aspects relating to ceramic starting mixtures or sintered ceramic products
    • C04B2235/02Composition of constituents of the starting material or of secondary phases of the final product
    • C04B2235/30Constituents and secondary phases not being of a fibrous nature
    • C04B2235/32Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
    • C04B2235/3205Alkaline earth oxides or oxide forming salts thereof, e.g. beryllium oxide
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Abstract

The invention discloses a kind of foam-formed techniques of light-weight refractory prefabricated component.The technique is mixed by heavy castable with water, then metallic aluminium powder is added, adds sodium hydroxide solution, after being uniformly mixed in injection mold, after waiting for metallic aluminium powder and sodium hydroxide solution in a mold the reaction was complete, stands a period of time demoulding and obtains prefabricated component green body;Then prefabricated component green body is toasted in roasting kiln, cooled to room temperature is to obtain the light-weight refractory prefabricated component after the completion of baking.For the prefabricated component using common heavy castable as raw material, the light-weight refractory prefabricated component porosity prepared in the presence of a blowing agent is high and can be used in 900~1600 DEG C of large temperature range, hence it is evident that increases the use scope of lightweight prefabricated component.Residual component Al in preparation process2O3The intensity of lightweight prefabricated component is increased to a certain extent, and the waste of noresidue raw material substantially increases raw material availability, reduces production cost.

Description

A kind of foam-formed technique of light-weight refractory prefabricated component
Technical field
The invention belongs to technical field of refractory materials.More particularly to a kind of foam-formed technique of light-weight refractory prefabricated component.
Technical background
Fire-resistant prefabricated member is that unshape refractory shapes between amorphous refractory and unshape refractory The advantages of changing, having both unshape refractory and amorphous refractory also becomes unshape refractory construction and application technology One new direction of development.
Fire-resistant prefabricated member is widely used because it has many advantages, such as that site operation is convenient, fast, service life is long, and Lightweight prefabricated component due to its density is low, thermal conductivity is small, high temperature resistant, it is wear-resistant, corrosion-resistant many advantages, such as, even more in steel, smelting The multiple fields such as gold, the energy, chemical industry, high-temperature industrial furnace are widely used.Therefore, there are many fire-resistant prefabricated members at present Preparation process, the production process of fire-resistant prefabricated member is relatively simple, substantially according to dispensing, stirring, molding, baking It is dry that process is waited to carry out.
Currently, the production loose porous material of light-weight refractory prefabricated component generally use in blending process or hollow aggregate are Matrix, then adds the preparation method for burning lost article, and the loose porous aggregate intensity that uses in these methods is low, refractoriness Low, temperature in use is typically not greater than 1000 DEG C, and hollow aggregate is not only of high cost and usually its bulk density is more much lower than water, difficult To be preferably applied to castable.Therefore the prefabricated component prepared using these raw materials can not be in 1000~1600 DEG C of items of higher temperature It is used under part, it is even more impossible to meet the use environment at each temperature, the service life under these temperature conditions is very short, serious to limit The a wide range of of lightweight prefabricated component has been made to promote the use of.In addition, it is difficult to be uniformly dispersed to burn lost article, can influence in use prefabricated The quality stability of part, and using burn lost article prepare prefabricated component in use, burn lost article reserve into branch with it is resistance to Fiery component reaction generates eutectic, further decreases the applied at elevated temperature performance of preform product.Therefore, common method system at present Standby light-weight refractory prefabricated component can not preferably be applied in higher temperature conditions and a variety of different environment.
Invention content
To solve the above-mentioned problems, the present invention provides a kind of foam-formed techniques of light-weight refractory prefabricated component.The technique Using heavy castable as matrix, then can be prepared by metallic aluminium powder and the foam-formed technique that sodium hydroxide reacts to each other Structure can uniformly have a wide range of application suitable for the use environment under 900~1600 DEG C of different temperatures, at low cost.
The present invention is achieved by the following technical solutions
A kind of foam-formed technique of light-weight refractory prefabricated component, the technique include the following steps:
(1) raw material needed for preparing:Heavy castable, metallic aluminium powder, sodium hydrate aqueous solution, water;
(2) heavy castable and water that step (1) prepares are added in blender, are mixed evenly, heavy is made to pour Material feeding moistens completely;The heavy castable moistened;
(3) metallic aluminium powder, sodium hydrate aqueous solution are sequentially added into the heavy castable of step (2) moistening, it is complete 3~5min is mixed in complete be added later, obtains viscous fluid;
(4) viscous fluid that step (3) obtains is added to interior skin to be coated in the mold of releasing agent, material is in mold It is inside chemically reacted, (is reacted with metallic aluminium powder due to sodium hydrate aqueous solution after viscous fluid addition grinding tool after the completion of reaction Gas is generated, has bubble to emerge, indicates that reaction is completed when no longer generating bubble), it stands, demould to get to prefabricated component idiosome;
(5) the prefabricated component idiosome that step (4) obtains is placed in roasting kiln and is toasted;After the completion of baking, stop adding Heat, the prefabricated component idiosome in roasting kiln cooled to room temperature to get to the light-weight refractory prefabricated component.
The grain size of the foam-formed technique of the light-weight refractory prefabricated component, the heavy castable is≤8mm, wherein institute State granularity≤0.15mm of heavy castable granule content account for heavy castable gross mass percentage be >=40%;The gold The grain size for belonging to aluminium powder is 60~200 mesh.
The foam-formed technique of the light-weight refractory prefabricated component, the heavy castable are that low cement high-alumina refractory pours Material feeding or low cement magnesium aluminum spinel pouring material.
The low cement magnesium aluminum spinel pouring material does not contain magnesia ingredient.
The foam-formed technique of the light-weight refractory prefabricated component, Al in the low cement high-alumina refractory castable2O3's Content >=65%;Al in the low cement magnesium aluminum spinel pouring material2O3Content >=85% of+MgO.
The foam-formed technique of the light-weight refractory prefabricated component, the Solute mass fraction of the sodium hydrate aqueous solution are 15~25%.
The addition of the foam-formed technique of the light-weight refractory prefabricated component, step (2) described water is heavy castable The 3~12% of addition gross mass.
The addition of the foam-formed technique of the light-weight refractory prefabricated component, the metallic aluminium powder described in step (3) is attached most importance to The 5~15% of gross mass are added in matter castable.
The foam-formed technique of the light-weight refractory prefabricated component, the addition of the sodium hydrate aqueous solution described in step (3) Amount is the 5~10% of heavy castable addition gross mass.
The foam-formed technique of the light-weight refractory prefabricated component, the releasing agent that step (4) mould inner surface applies are The refractory materials such as machine oil, lubricating oil, silicone oil, polyethylene glycol often use releasing agent.
The foam-formed technique of the light-weight refractory prefabricated component, the standing described in step (4) are in 15~25 DEG C of conditions 22~28h of lower standing;The detailed process that step (5) the prefabricated component idiosome is toasted in roasting kiln is as follows:By prefabricated component It is placed in roasting kiln, is toasted for 24 hours under the conditions of 110 ± 5 DEG C;After the completion of baking, by the temperature in roasting kiln in heating rate To be warming up to 1200 ± 10 DEG C by 110 ± 5 DEG C under conditions of 5 DEG C/min, then protected under conditions of temperature is 1200 ± 10 DEG C Warm 6h stops heating after the completion of heat preservation, closes kiln cooled to room temperature.
A kind of light-weight refractory prefabricated component prepared by the above-mentioned foam-formed technique of light-weight refractory prefabricated component.
The present invention is using the heavy castable of different temperature in use as raw material, in the presence of metallic aluminium powder and sodium hydroxide solution It is prepared for that the porosity is high, light-weight refractory prefabricated component of good heat insulating;So that the product prepared both has preferable heat-insulating property It can use at high temperature again.
Compared with prior art, the present invention has following positive beneficial effect
The present invention using metallic aluminium powder as foaming agent, in the presence of sodium hydroxide solution, utilize the hydroxide of various concentration The dosage of sodium solution and sodium hydroxide solution controls reaction of getting angry, and a large amount of uniform and stable bubbles are generated in certain temperature range Foam can prepare the porosity and be up to 80~85% light-weight refractory prefabricated component and under the porosity with higher intensity; And the prefabricated component containing different porosities can be prepared by controlling reaction of getting angry, it disclosure satisfy that the use of varying environment is wanted It asks;
The present invention is using metallic aluminium powder as foaming agent, and final residue is aluminium oxide, and the presence of aluminium oxide is to a certain degree On increase the intensity of prefabricated component, and it is without any side effects to fire-resistant prefabricated member.I.e. the addition of metallic aluminium powder can not only make It is standby go out required high porosity product, and its residue also plays certain humidification, substantially increases and is added The utilization rate of raw material reduces the use of other raw materials, reduces production cost;
In the prior art, use the lightening casting material that loose porous or hollow aggregate is prepared for matrix can not be in high temperature Lower use, and lightening casting material can not be prepared using heavy castable and obtained product gas porosity minimum living warm nature can be compared with Difference;The present invention uses common heavy castable, can prepare hole in the presence of a blowing agent, by foam-formed technique Rate is up to 80~85% light-weight refractory prefabricated component, can be used under the conditions of temperature is 900~1600 DEG C, solve existing skill Technical problem (the technical issues of high performance moulding by casting light-weight refractory prefabricated component can not be prepared) in art;
It is prefabricated in a series of 900~1600 DEG C of light-weight refractories that the application can produce temperature in use with lower cost Part considerably increases the application field and application range of lightweight prefabricated component.
Specific implementation mode
The present invention is described in more details below by specific implementation mode, but is not intended to restrict the invention Protection domain.
Embodiment 1
A kind of foam-formed technique of light-weight refractory prefabricated component, the technique include the following steps:
(1) raw material needed for preparing:
Low cement high-alumina refractory castable, wherein Al2O3Content >=65%,;Its temperature in use is 1400 DEG C;
Granularity is the metallic aluminium powder of 60~200 mesh;
The sodium hydroxide solution that mass concentration is 15%;
Water;
Granularity≤8mm of the low cement high-alumina refractory castable;Wherein, the granule content of granularity≤0.15mm accounts for heavy The percentage of castable (low cement high-alumina refractory castable) gross mass is >=40%;
(2) the ready low cement high-alumina refractory castable of step (1) is taken to be added in blender, be then added water (water Addition is the 10% of low cement high-alumina refractory castable gross mass), it is mixed evenly, the low cement high alumina moistened is resistance to Fiery castable;
(3) it is 60~200 mesh that granularity is sequentially added into the low cement high-alumina refractory castable of the moistening described in step (2) Metallic aluminium powder, mass concentration be 15% sodium hydroxide solution, be mixed 3min, obtain viscous fluid;
Wherein, the addition of metallic aluminium powder is that low cement high-alumina refractory castable is added the 5% of gross mass;Sodium hydroxide is molten The addition of liquid is that low cement high-alumina refractory castable is added the 10% of gross mass;
(4) viscous fluid described in step (3) is added in the mold for being coated with releasing agent rapidly, is glued under the conditions of 15 DEG C Property fluid continuation reacted in mold, when being generated there is no bubble in mold, the reaction was complete;Continue after reaction 15 22h is stood under the conditions of DEG C, is demoulded after the completion of standing, obtains the green body of prefabricated component;
(4) the prefabricated component green body that step (4) obtains is placed in roasting kiln and is toasted for 24 hours under the conditions of 110 ± 5 DEG C;It dries After the completion of roasting, the temperature in roasting kiln is warming up to 1200 ± 10 under conditions of heating rate is 5 DEG C/min by 110 ± 5 DEG C DEG C, 6h is then kept the temperature under conditions of temperature is 1200 ± 10 DEG C, is stopped heating after the completion of heat preservation, is closed kiln and naturally cool to room Temperature is to get to light-weight refractory prefabricated component.
Product prepared by the embodiment can use under the conditions of 1400 DEG C, can be used in industrial thermal kiln furnace heat preservation lining. Such as heater for rolling steel insulating layer, heat preservation of aluminium electrolytic cell layer.
The light-weight refractory prefabricated component prepared to the embodiment is detected, as a result as follows:
The porosity:30~40%;
Bulk density:1.4~1.6g/cm3
Thermal conductivity:1000℃≤0.75w/(m·k);
110 DEG C of x24h cold crushing strengths:≥6MPa;
Permanent Linear change rate after 1400 DEG C of x3h are burnt:- 0.1~+0.1%
Embodiment 2
(1) raw material needed for preparing:
Low cement high-alumina refractory castable, wherein Al2O3Content >=80%, temperature in use be 1500 DEG C;
Granularity is the metallic aluminium powder of 60~200 mesh;
The sodium hydrate aqueous solution that mass concentration is 25%;
Water;
Wherein, granularity≤8mm of the low cement high-alumina refractory castable;The granule content of wherein granularity≤0.15mm accounts for The percentage of heavy castable (low cement high-alumina refractory castable) gross mass is >=40%;
(2) the ready low cement high-alumina refractory castable of step (1) is added in blender, be then added water (water Addition is 5~6% that low cement high-alumina refractory castable gross mass is added), it is mixed evenly, the low cement moistened High-alumina refractory castable;
(3) granularity is sequentially added into the low cement high-alumina refractory castable of the uniformly mixed moistening described in step (2) The sodium hydroxide solution for being 25% for the metallic aluminium powder of 60~200 mesh, mass concentration is mixed 5min, obtains viscous fluid;
Wherein, the addition of metallic aluminium powder is the 15% of the low cement high-alumina refractory castable gross mass being added;Hydroxide The addition of sodium solution is that low cement high-alumina refractory castable is added the 10% of gross mass;
(4) viscous fluid that step (3) obtains is added in the mold for being coated with releasing agent rapidly, is glued under the conditions of 25 DEG C Property fluid reacted in mold, when emerging there is no bubble in mold i.e. reaction terminate;Continue after reaction 25 28h is stood under the conditions of DEG C, is demoulded after the completion of standing, obtains the green body of prefabricated component;
(5) the prefabricated component green body that step (4) obtains is placed in roasting kiln and is toasted for 24 hours under the conditions of 110 ± 5 DEG C;It dries After the completion of roasting, the temperature in roasting kiln is warming up to 1200 ± 10 under conditions of heating rate is 5 DEG C/min by 110 ± 5 DEG C DEG C, 6h is then kept the temperature under conditions of temperature is 1200 ± 10 DEG C, is stopped heating after the completion of heat preservation, is closed kiln and naturally cool to room Temperature is to get to light-weight refractory prefabricated component.
Product prepared by the embodiment can use under the conditions of 1500 DEG C, can be used in the wrapping of Bottom of Heating Furnace water cooling tube Material etc..
The light-weight refractory prefabricated component prepared to the embodiment is detected, as a result as follows:
Al2O3Content >=80%
The porosity:80~85%
Bulk density:0.5~0.6g/cm3
Thermal conductivity:1000℃≤0.3w/(m·k)
110 DEG C of x24h cold crushing strengths:≥1.5MPa
Permanent Linear change rate after 1500 DEG C of x3h are burnt:- 0.2~0%
Embodiment 3
(1) raw material needed for preparing:
Low cement high-alumina refractory castable, wherein Al2O3Content >=90%, temperature in use be 1600 DEG C;
Granularity is the metallic aluminium powder of 60~200 mesh;
The sodium hydrate aqueous solution that mass concentration is 20%;
Water;
Wherein, granularity≤8mm of the low cement high-alumina refractory castable;The wherein granule content of granularity≤0.15mm The percentage for accounting for heavy castable (low cement high-alumina refractory castable) gross mass is >=40%;
(2) the ready low cement high-alumina refractory castable of step (1) is added in blender, be then added water (water Addition is 4~5% that low cement high-alumina refractory castable gross mass is added), it is mixed evenly, the low cement moistened High-alumina refractory castable;
(3) granularity is sequentially added into the low cement high-alumina refractory castable of the uniformly mixed moistening described in step (2) The sodium hydroxide solution for being 20% for the metallic aluminium powder of 60~200 mesh, mass concentration is mixed 4min, obtains viscous fluid;
Wherein, the addition of metallic aluminium powder is the 10% of the low cement high-alumina refractory castable gross mass being added;Hydroxide The addition of sodium solution is that low cement high-alumina refractory castable is added the 8% of gross mass;
(4) viscous fluid that step (3) obtains is added in the mold for being coated with releasing agent rapidly, is glued under the conditions of 20 DEG C Property fluid reacted in mold, when emerging there is no bubble in mold i.e. reaction terminate;Continue after reaction 20 It is stood under the conditions of DEG C for 24 hours, is demoulded after the completion of standing, obtain the green body of prefabricated component;
(5) the prefabricated component green body that step (4) obtains is placed in roasting kiln and is toasted for 24 hours under the conditions of 110 ± 5 DEG C;It dries After the completion of roasting, the temperature in roasting kiln is warming up to 1200 ± 10 under conditions of heating rate is 5 DEG C/min by 110 ± 5 DEG C DEG C, 6h is then kept the temperature under conditions of temperature is 1200 ± 10 DEG C, is stopped heating after the completion of heat preservation, is closed kiln and naturally cool to room Temperature is to get to light-weight refractory prefabricated component.
Product prepared by the embodiment can use under the conditions of 1600 DEG C, can be used in the side such as ladle disperse formula air brick Face.
The light-weight refractory prefabricated component prepared to the embodiment is detected, as a result as follows:
The porosity:50~60%
Bulk density:0.8~1.0g/cm3
Thermal conductivity:1000℃≤0.5w/(m·k)
110 DEG C of x24h cold crushing strengths:≥4MPa
Permanent Linear change rate after 1600 DEG C of x3h are burnt:- 0.2~0%
Embodiment 4
(1) raw material needed for preparing:
Low cement high-alumina refractory castable, wherein Al2O3Content >=90%, temperature in use be 1600 DEG C;
Granularity is the metallic aluminium powder of 60~200 mesh;
The sodium hydrate aqueous solution that mass concentration is 20%;
Water;
Wherein, granularity≤8mm of the low cement high-alumina refractory castable;The granule content of wherein granularity≤0.15mm accounts for The percentage of heavy castable gross mass is >=40%;
(2) the ready low cement high-alumina refractory castable of step (1) is added in blender, be then added water (water Addition is 4~5% that low cement high-alumina refractory castable gross mass is added), it is mixed evenly, the low cement moistened High-alumina refractory castable;
(3) granularity is sequentially added into the low cement high-alumina refractory castable of the uniformly mixed moistening described in step (2) The sodium hydroxide solution for being 20% for the metallic aluminium powder of 60~200 mesh, mass concentration is mixed 4min, obtains viscous fluid;
Wherein, the addition of metallic aluminium powder is the 5% of the low cement high-alumina refractory castable gross mass being added;Sodium hydroxide The addition of solution is that low cement high-alumina refractory castable is added the 5% of gross mass;
(4) viscous fluid that step (3) obtains is added in the mold for being coated with releasing agent rapidly, is glued under the conditions of 20 DEG C Property fluid reacted in mold, when emerging there is no bubble in mold i.e. reaction terminate;Continue after reaction 20 22h is stood under the conditions of DEG C, is demoulded after the completion of standing, obtains the green body of prefabricated component;
(5) the prefabricated component green body that step (4) obtains is placed in roasting kiln and is toasted for 24 hours under the conditions of 110 ± 5 DEG C;It dries After the completion of roasting, the temperature in roasting kiln is warming up to 1200 ± 10 under conditions of heating rate is 5 DEG C/min by 110 ± 5 DEG C DEG C, 6h is then kept the temperature under conditions of temperature is 1200 ± 10 DEG C, is stopped heating after the completion of heat preservation, is closed kiln and naturally cool to room Temperature is to get to light-weight refractory prefabricated component.
Product prepared by the embodiment can use under the conditions of 1600 DEG C, can be used in the permanent of 30~180 tons of ladles Layer etc..
The light-weight refractory prefabricated component prepared to the embodiment is detected, as a result as follows:
Al2O3Content >=90%
The porosity:30~40%
Bulk density:1.4~1.6g/cm3
Thermal conductivity:1000℃≤0.75w/(m·k)
110 DEG C of x24h cold crushing strengths:≥6MPa
Permanent Linear change rate after 1500 DEG C of x3h are burnt:- 0.2~0%
Embodiment 5
A kind of foam-formed technique of light-weight refractory prefabricated component, the technique include the following steps:
(1) prepare all raw materials:
Low cement magnesium aluminum spinel pouring material, wherein Al2O3Content >=80% of+MgO;Its temperature in use is 1550 DEG C;
Granularity is the metallic aluminium powder of 60~200 mesh;
The sodium hydrate aqueous solution that mass concentration is 15%;
Water;
Wherein, granularity≤8mm of the low cement magnesium aluminum spinel pouring material;The wherein granule content of granularity≤0.15mm The percentage for accounting for heavy castable (low cement magnesium aluminum spinel pouring material) gross mass is >=40%;
(2) it takes the ready low cement magnesium aluminum spinel pouring material of step (1) to be added in blender, water (water is then added Addition be low cement magnesium aluminum spinel pouring material be added gross mass 3~6%), be mixed evenly, what is moistened is low Cement magnesium aluminum spinel pouring material;
(3) it is 60~200 mesh that granularity is sequentially added into the low cement magnesium aluminum spinel pouring material of step (2) described moistening Metallic aluminium powder, mass concentration be 15% sodium hydrate aqueous solution, be mixed 3min, obtain viscous fluid;
Wherein, the addition of the metallic aluminium powder is that low cement magnesium aluminum spinel pouring material is added the 5% of gross mass;It is described The addition of sodium hydroxide solution is that low cement magnesium aluminum spinel pouring material is added the 5% of gross mass;
(4) viscous fluid described in step (3) is added in the mold for being coated with releasing agent rapidly, is glued under the conditions of 15 DEG C Property fluid the reaction was continued in mold, when emerging there is no bubble in mold i.e. indicate the reaction was complete;Continue after reaction 22h is stood under the conditions of 15 DEG C, is demoulded after the completion of standing, obtains prefabricated component green body;
(5) the prefabricated component green body that step (4) obtains is placed in roasting kiln and is toasted for 24 hours under the conditions of 110 ± 5 DEG C;It dries After the completion of roasting, the temperature in roasting kiln is warming up to 1200 ± 10 under conditions of heating rate is 5 DEG C/min by 110 ± 5 DEG C DEG C, 6h is then kept the temperature under conditions of temperature is 1200 ± 10 DEG C, is stopped heating after the completion of heat preservation, is closed kiln and naturally cool to room Temperature is to get to light-weight refractory prefabricated component.
Product prepared by the embodiment can use under the conditions of 1550 DEG C, can be used in the permanent of 30~120 tons of ladles Layer etc..
The light-weight refractory prefabricated component prepared to the embodiment is detected, as a result as follows:
Al2O3Content >=80% of+MgO
The porosity:30~40%
Bulk density:1.4~1.6g/cm3
Thermal conductivity:1000℃≤0.75w/(m·k)
110 DEG C of x24h cold crushing strengths:≥6MPa
Permanent Linear change rate after 1550 DEG C of x3h are burnt:- 0.2~0%
Embodiment 6
A kind of foam-formed technique of light-weight refractory prefabricated component, the technique include the following steps:
(1) prepare all raw materials:
Low cement magnesium aluminum spinel pouring material, wherein Al2O3Content >=85% of+MgO;Its temperature in use is 1600 DEG C;
Granularity is the metallic aluminium powder of 60~200 mesh;
The sodium hydrate aqueous solution that mass concentration is 25%;
Water;
Wherein, granularity≤8mm of the low cement magnesium aluminum spinel pouring material;The wherein granule content of granularity≤0.15mm The percentage for accounting for heavy castable gross mass is >=40%;
(2) it takes the ready low cement magnesium aluminum spinel pouring material of step (1) to be added in blender, water (water is then added Addition be low cement magnesium aluminum spinel pouring material be added gross mass 4~5%), be mixed evenly, what is moistened is low Cement magnesium aluminum spinel pouring material;
(3) it is 60~200 that granularity is sequentially added into the low cement magnesium aluminum spinel pouring material of the moistening described in step (2) Purpose metallic aluminium powder, the sodium hydrate aqueous solution that mass concentration is 25%, are mixed 5min, obtain viscous fluid;
Wherein, the addition of the metallic aluminium powder is that low cement magnesium aluminum spinel pouring material is added the 15% of gross mass;Institute The addition for stating sodium hydroxide solution is that low cement magnesium aluminum spinel pouring material is added the 10% of gross mass;
(4) viscous fluid described in step (3) is added in the mold for being coated with releasing agent rapidly, is glued under the conditions of 25 DEG C Property fluid the reaction was continued in mold, when emerging there is no bubble in mold i.e. indicate the reaction was complete;Continue after reaction 26h is stood under the conditions of 25 DEG C, is demoulded after the completion of standing, obtains prefabricated component green body;
(5) the prefabricated component green body that step (4) obtains is placed in roasting kiln and is toasted for 24 hours under the conditions of 110 ± 5 DEG C;It dries After the completion of roasting, the temperature in roasting kiln is warming up to 1200 ± 10 under conditions of heating rate is 5 DEG C/min by 110 ± 5 DEG C DEG C, 6h is then kept the temperature under conditions of temperature is 1200 ± 10 DEG C, is stopped heating after the completion of heat preservation, is closed kiln and naturally cool to room Temperature is to get to light-weight refractory prefabricated component.
Product prepared by the embodiment can use under the conditions of 1600 DEG C, can be used in the side such as high-temperature electric resistance furnace working lining Face.
The light-weight refractory prefabricated component prepared to the embodiment is detected, as a result as follows:
Al2O3Content >=85% of+MgO
The porosity:80~85%
Bulk density:0.5~0.6g/cm3
Thermal conductivity:1000℃≤0.3w/(m·k)
110 DEG C of x24h cold crushing strengths:≥1.5MPa
Permanent Linear change rate after 1600 DEG C of x3h are burnt:- 0.2~0%
Embodiment 7
A kind of foam-formed technique of light-weight refractory prefabricated component, the technique include the following steps:
(1) prepare all raw materials:
Low cement magnesium aluminum spinel pouring material, wherein Al2O3Content >=85% of+MgO;Its temperature in use is 1600 DEG C;
Granularity is the metallic aluminium powder of 60~200 mesh;
The sodium hydrate aqueous solution that mass concentration is 20%;
Water;
Wherein, granularity≤8mm of the low cement magnesium aluminum spinel pouring material.The particle of wherein granularity≤0.15mm contains The percentage that amount accounts for heavy castable gross mass is >=40%;
(2) it takes the ready low cement magnesium aluminum spinel pouring material of step (1) to be added in blender, water (water is then added Addition be low cement magnesium aluminum spinel pouring material be added gross mass 4~5%), be mixed evenly, what is moistened is low Cement magnesium aluminum spinel pouring material;
(3) it is 60~200 that granularity is sequentially added into the low cement magnesium aluminum spinel pouring material of the moistening described in step (2) Purpose metallic aluminium powder, the sodium hydrate aqueous solution that mass concentration is 20%, are mixed 5min, obtain viscous fluid;
Wherein, the addition of the metallic aluminium powder is that low cement magnesium aluminum spinel pouring material is added the 15% of gross mass;Institute The addition for stating sodium hydroxide solution is that low cement magnesium aluminum spinel pouring material is added the 10% of gross mass;
(4) viscous fluid described in step (3) is added in the mold for being coated with releasing agent rapidly, is glued under the conditions of 25 DEG C Property fluid the reaction was continued in mold, when emerging there is no bubble in mold i.e. indicate the reaction was complete;Continue after reaction It is stood under the conditions of 25 DEG C for 24 hours, is demoulded after the completion of standing, obtain prefabricated component green body;
(5) the prefabricated component green body that step (4) obtains is placed in roasting kiln and is toasted for 24 hours under the conditions of 110 ± 5 DEG C;It dries After the completion of roasting, the temperature in roasting kiln is warming up to 1200 ± 10 under conditions of heating rate is 5 DEG C/min by 110 ± 5 DEG C DEG C, 6h is then kept the temperature under conditions of temperature is 1200 ± 10 DEG C, is stopped heating after the completion of heat preservation, is closed kiln and naturally cool to room Temperature is to get to light-weight refractory prefabricated component.
Product prepared by the embodiment can use under the conditions of 1600 DEG C, can be used in the side such as high-temperature electric resistance furnace working lining Face.
The light-weight refractory prefabricated component prepared to the embodiment is detected, as a result as follows:
Al2O3Content >=85% of+MgO
The porosity:80~85%
Bulk density:0.5~0.6g/cm3
Thermal conductivity:1000℃≤0.3w/(m·k)
110 DEG C of x24h cold crushing strengths:≥1.5MPa
Permanent Linear change rate after 1600 DEG C of x3h are burnt:- 0.4~0%
Embodiment 8
A kind of foam-formed technique of light-weight refractory prefabricated component, the technique include the following steps:
(1) prepare all raw materials:
Low cement magnesium aluminum spinel pouring material, wherein Al2O3Content >=85% of+MgO;Its temperature in use is 1600 DEG C;
Granularity is the metallic aluminium powder of 60~200 mesh;
The sodium hydrate aqueous solution that mass concentration is 20%;
Water;
Wherein, granularity≤8mm of the low cement magnesium aluminum spinel pouring material.The wherein granule content of granularity≤0.15mm The percentage for accounting for heavy castable gross mass is >=40%;
(2) it takes the ready low cement magnesium aluminum spinel pouring material of step (1) to be added in blender, water (water is then added Addition be low cement magnesium aluminum spinel pouring material be added gross mass 4~5%), be mixed evenly, what is moistened is low Cement magnesium aluminum spinel pouring material;
(3) it is 60~200 that granularity is sequentially added into the low cement magnesium aluminum spinel pouring material of the moistening described in step (2) Purpose metallic aluminium powder, the sodium hydrate aqueous solution that mass concentration is 20%, are mixed 4min, obtain viscous fluid;
Wherein, the addition of the metallic aluminium powder is that low cement magnesium aluminum spinel pouring material is added the 10% of gross mass;Institute The addition for stating sodium hydroxide solution is that low cement magnesium aluminum spinel pouring material is added the 8% of gross mass;
(4) viscous fluid described in step (3) is added in the mold for being coated with releasing agent rapidly, is glued under the conditions of 25 DEG C Property fluid the reaction was continued in mold, when emerging there is no bubble in mold i.e. indicate the reaction was complete;Continue after reaction It is stood under the conditions of 25 DEG C for 24 hours, is demoulded after the completion of standing, obtain prefabricated component green body;
(5) the prefabricated component green body that step (4) obtains is placed in roasting kiln and is toasted for 24 hours under the conditions of 110 ± 5 DEG C;It dries After the completion of roasting, the temperature in roasting kiln is warming up to 1200 ± 10 under conditions of heating rate is 5 DEG C/min by 110 ± 5 DEG C DEG C, 6h is then kept the temperature under conditions of temperature is 1200 ± 10 DEG C, is stopped heating after the completion of heat preservation, is closed kiln and naturally cool to room Temperature is to get to light-weight refractory prefabricated component.
Product prepared by the embodiment can use under the conditions of 1600 DEG C, can be used in the permanent layer of 30~80 tons of ladles Etc..
The light-weight refractory prefabricated component prepared to the embodiment is detected, as a result as follows:
Al2O3Content >=85% of+MgO
The porosity:50~60%
Bulk density:0.8~1.0g/cm3
Thermal conductivity:1000℃≤0.5w/(m·k)
110 DEG C of x24h cold crushing strengths:≥4MPa
Permanent Linear change rate after 1600 DEG C of x3h are burnt:- 0.4~0%
Embodiment 9
A kind of foam-formed technique of light-weight refractory prefabricated component, the technique include the following steps:
(1) prepare all raw materials:
Low cement magnesium aluminum spinel pouring material, wherein Al2O3Content >=85% of+MgO;Its temperature in use is 1600 DEG C;
Granularity is the metallic aluminium powder of 60~200 mesh;
The sodium hydrate aqueous solution that mass concentration is 20%;
Water;
Wherein, granularity≤8mm of the low cement magnesium aluminum spinel pouring material;The wherein granule content of granularity≤0.15mm The percentage for accounting for heavy castable gross mass is >=40%;
(2) it takes the ready low cement magnesium aluminum spinel pouring material of step (1) to be added in blender, water (water is then added Addition be low cement magnesium aluminum spinel pouring material be added gross mass 4~5%), be mixed evenly, what is moistened is low Cement magnesium aluminum spinel pouring material;
(3) it is 60~200 that granularity is sequentially added into the low cement magnesium aluminum spinel pouring material of the moistening described in step (2) Purpose metallic aluminium powder, the sodium hydrate aqueous solution that mass concentration is 20%, are mixed 3min, obtain viscous fluid;
Wherein, the addition of the metallic aluminium powder is that low cement magnesium aluminum spinel pouring material is added the 5% of gross mass;It is described The addition for the sodium hydroxide solution that mass concentration is 20% is that low cement magnesium aluminum spinel pouring material is added the 5% of gross mass;
(4) viscous fluid described in step (3) is added in the mold for being coated with releasing agent rapidly, is glued under the conditions of 25 DEG C Property fluid the reaction was continued in mold, when emerging there is no bubble in mold i.e. indicate the reaction was complete;Continue after reaction 22h is stood under the conditions of 25 DEG C, is demoulded after the completion of standing, obtains prefabricated component green body;
(5) the prefabricated component green body that step (4) obtains is placed in roasting kiln and is toasted for 24 hours under the conditions of 110 ± 5 DEG C;It dries After the completion of roasting, the temperature in roasting kiln is warming up to 1200 ± 10 under conditions of heating rate is 5 DEG C/min by 110 ± 5 DEG C DEG C, it then keeps the temperature 6h at such a temperature, stops heating after the completion of heat preservation, close kiln cooled to room temperature to get to light-weight refractory Prefabricated component.
Product prepared by the embodiment can use under the conditions of 1600 DEG C, can be used in 30,40 tons of ladle workings and be lined with And the permanent layer etc. of 50~100 tons of ladles.
The light-weight refractory prefabricated component prepared to the embodiment is detected, as a result as follows:
Al2O3Content >=85% of+MgO
The porosity:30~40%
Bulk density:1.4~1.6g/cm3
Thermal conductivity:1000℃≤0.75w/(m·k)
110 DEG C of x24h cold crushing strengths:≥6MPa
Permanent Linear change rate after 1600 DEG C of x3h are burnt:- 0.1~+0.1%
By above-mentioned preparation process it is found that the present invention can prepare the different porositys using common heavy castable Lightening casting material, and obtained lightening casting material has higher intensity under different porosity property, and can make For under higher temperature conditions.It is prepared for the high porosity under conditions of low cost, intensity height, high temperature, energy can be suitable for Enough light weight castable refractories used at different conditions.

Claims (10)

1. a kind of foam-formed technique of light-weight refractory prefabricated component, which is characterized in that the technique includes the following steps:
(1) raw material needed for preparing:Heavy castable, metallic aluminium powder, sodium hydrate aqueous solution, water;
(2) by described in step (1) heavy castable and water be added blender in, be mixed evenly, the heavy moistened Castable;
(3) metallic aluminium powder, sodium hydroxide solution are sequentially added into the heavy castable of step (2) moistening, are mixed 3 ~5min, obtains viscous fluid;
(4) viscous fluid that step (3) obtains is added to surface layer to be coated in the mold of releasing agent, material is changed in mold Reaction is learned, after the completion of reaction, stands, demoulding, obtains prefabricated component idiosome;
(5) the prefabricated component idiosome that step (4) obtains is placed in roasting kiln and is toasted;After the completion of baking, stop heating, institute The prefabricated component idiosome stated in roasting kiln cooled to room temperature to get to the light-weight refractory prefabricated component.
2. the foam-formed technique of light-weight refractory prefabricated component according to claim 1, which is characterized in that the heavy cast The granularity of material is≤8mm;The granularity of the metallic aluminium powder is 60~200 mesh.
3. the foam-formed technique of light-weight refractory prefabricated component according to claim 1 or 2, which is characterized in that the weight Matter castable is low cement high-alumina refractory castable or low cement magnesium aluminum spinel pouring material.
4. the foam-formed technique of light-weight refractory prefabricated component according to claim 3, which is characterized in that the low cement Al in high-alumina refractory castable2O3Content >=65%;Al in the low cement alumina-spinel castable2O3The content of+MgO >=85%.
5. the foam-formed technique of light-weight refractory prefabricated component according to claim 1, which is characterized in that the sodium hydroxide The mass concentration of aqueous solution is 15~25%.
6. the foam-formed technique of light-weight refractory prefabricated component according to claim 1, which is characterized in that step (2) is described Water addition be heavy castable addition gross mass 3~12%.
7. the foam-formed technique of light-weight refractory prefabricated component according to claim 1, which is characterized in that step (3) is described Metallic aluminium powder addition be heavy castable be added gross mass 5~15%.
8. the foam-formed technique of light-weight refractory prefabricated component according to claim 1, which is characterized in that step (3) is described Sodium hydroxide solution addition be heavy castable be added gross mass 5~10%.
9. the foam-formed technique of light-weight refractory prefabricated component according to claim 1, which is characterized in that step (4) is described Standing be under the conditions of 15~25 DEG C stand 22~28h;Step (5) the prefabricated component idiosome is toasted in roasting kiln Detailed process is as follows:Prefabricated component is placed in roasting kiln, is toasted for 24 hours under the conditions of 110 ± 5 DEG C;After the completion of baking, the temperature Degree is warming up to 1200 ± 10 DEG C under conditions of heating rate is 5 DEG C/min by 110 ± 5 DEG C, then keeps the temperature 6h at such a temperature, Stop heating after the completion of heat preservation, closes kiln cooled to room temperature.
10. a kind of light-weight refractory prepared by the foam-formed technique of claim 1~9 any one of them light-weight refractory prefabricated component Prefabricated component.
CN201810143503.2A 2018-02-12 2018-02-12 A kind of foam-formed technique of light-weight refractory prefabricated component Pending CN108285339A (en)

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