CN104710182B - A kind of preparation method and castable of dispersibility aluminium oxide for castable - Google Patents
A kind of preparation method and castable of dispersibility aluminium oxide for castable Download PDFInfo
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- CN104710182B CN104710182B CN201510118919.5A CN201510118919A CN104710182B CN 104710182 B CN104710182 B CN 104710182B CN 201510118919 A CN201510118919 A CN 201510118919A CN 104710182 B CN104710182 B CN 104710182B
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Abstract
The invention discloses a kind of preparation method of the dispersibility aluminium oxide for castable, comprises the following steps：Alumina powder, water reducer and adjustable solidification agent are carried out into mixed processing, dispersibility aluminium oxide is obtained；The granularity of the alumina powder meets simultaneously：D50≤ 10 μm, D90≤20μm；The weight of the alumina powder, water reducer and adjustable solidification agent is as follows：Alumina powder 60～95；Water reducer 5～40；Adjustable solidification agent 0～5.The preparation method of the dispersibility aluminium oxide that the present invention is provided, process is simple, it is with low cost, and the dispersibility aluminium oxide for preparing is uniformly dispersed in castable, the amount of water of castable can be significantly reduced, the condensation performance of castable is adjusted effectively, that improves castable can application property, anti-bleeding and early strength.
Description
Technical field
The present invention relates to fire resisting material field, and in particular to a kind of preparation method of the dispersibility aluminium oxide for castable
And castable.
Background technology
In recent years, unshape refractory due to labor productivity it is high, adaptability is good, consumption of raw materials is low excellent
Gesture, is developed rapidly, and in refractory material, shared proportion constantly expands, it has also become is weighed refractories industry technology and is sent out
The important symbol of exhibition level.
Used as the advanced country of world's refractory technology, Japan takes the lead in becoming unshape refractory yield and surpasses for 1992
Cross the country of amorphous refractory.At present, the ratio that Japanese unshape refractory yield accounts for whole refractory material is 70% left
The right side, the U.S. are 50% or so, and European countries such as English, moral, method etc. are 40%～50%, and China is estimated 30% or so.But, in
More than 11,000,000 tons, the absolute quantities of unshape refractory are first place in the world to the refractory material total output of state, from now on, Chinese
Unshape refractory has very big development space.
In unshape refractory, additive has very important significance, and the consumption of additive is typically fewer, but
Additive is for the improvement highly significant of unshape refractory workability and intensity.
The selection of additive is typically based on material property, construction operation requirement and use condition and determines, can use single substance,
Compound substance can also be used.Water reducer is important one kind in additive, and water reducer energy is added in unshape refractory
Dispersion and water-reducing effect well are enough played, is effectively improved the mobility of material, and is improved fire proofed wood to a certain extent
The physical property of material.
Water reducer used in existing refractory material only disperses the effect of diminishing, and also needs to when in use and other
Additive is used cooperatively together, so that castable reaches best performance.The addition of existing water reducer generally 0.05%～
0.2%, as addition is less, can there is the uneven situation of dispersion, affect using effect.
Alumina powder is added in castable at present, is introduced primarily as the base portion of castable, addition one
As be 5%～20%, can play and improve the mobility of castable, consistency, reactivity, and the burning under high temperature can be promoted
Knot.
In prior art, it is impossible to the setting time (namely engineering time of product) of castable is carried out according to climate change
Adjustment, the setting time of summer castable are shorter, affect workability, and the setting time of winter castable is very long, or even occur
Coagulation phenomena does not affect demoulding strength.
Accordingly, it is desirable to provide a kind of additive that can quickly and easily adjust castable setting time, has castable
Standby optimal setting time and good workability.
The content of the invention
The invention provides a kind of preparation method of the dispersibility aluminium oxide for castable, the dispersibility oxygen for preparing
Change aluminum stable in properties, be uniformly dispersed in castable during use, the setting time of castable can be conveniently adjusted, and had good
Good diminishing dispersion effect, improves the intensity and anti-bleeding performance of castable.
A kind of preparation method of the dispersibility aluminium oxide for castable, comprises the following steps：By alumina powder, water reducer
Mixed processing is carried out with adjustable solidification agent, dispersibility aluminium oxide is obtained；The granularity of the alumina powder meets simultaneously：D50≤ 10 μm, D90
≤20μm；The weight of the alumina powder, water reducer and adjustable solidification agent is as follows：
Alumina powder 60～95
Water reducer 5～40
Adjustable solidification agent 0～5.
D50That is the particle mean size of alumina powder, when representing that the cumulative particle sizes percentile of alumina powder reaches 50%, institute is right
In the particle diameter answered, i.e. alumina powder, particle diameter accounts for 50% less than the granule of the particle diameter.
D90The equivalent diameter of the largest particles when representing that the cumulative particle sizes percentile of alumina powder reaches 90% (is put down
Equal particle diameter), i.e., in alumina powder, particle diameter accounts for 90% less than the granule of the particle diameter.
Described alumina powder is adopted and is obtained with the following method：By α-Al2O3It is put in ball mill, with ratio of grinding media to material 2.5～5：1,
Ball milling obtains the alumina powder in 3～10 hours.
α-the Al2O3Using active alpha-Al2O3, active alpha-Al2O3Middle Al2O3Mass percent >=95%, it is preferable that
Ratio of grinding media to material is 3～4：1, ball milling 4～8 hours.
The dispersibility aluminium oxide that the preparation method that the present invention is provided is prepared is used as the additive of castable, is being poured
Addition in material feeding is difficult excessively, therefore, in order to play good improvement result to the performance of castable, need to increase diminishing
Agent and the content of adjustable solidification agent, but, with the increase of water reducer and adjustable solidification agent content, the content of alumina powder correspondingly subtracts
It is few, addition of the dispersibility aluminium oxide in castable can be caused very few, be difficult to be uniformly dispersed.
Preferably, the weight of the alumina powder, water reducer and adjustable solidification agent is as follows：
Alumina powder 70～85
Water reducer 15～30
Adjustable solidification agent 0.1～4.
Further preferably, the weight of the alumina powder, water reducer and adjustable solidification agent is as follows：
Alumina powder 80～85
Water reducer 20～25
Adjustable solidification agent 0.5～3.
The purpose of mixed processing, is, by alumina powder, water reducer and adjustable solidification agent mix homogeneously, and to form stable composite junction
Structure, the stable homogeneous of retention propertiess when used in castable.Preferably, the mixed processing is mixed using mechanical mixture, air-flow
Close or mist projection granulating.
When the mixed processing adopts mechanical mixture, alumina powder, water reducer and adjustable solidification agent are put in ball grinder and are mixed,
Ratio of grinding media to material is 1：2.5～5.
The ball grinder and abrading-ball all adopt the good corundum material of anti-wear performance, it is preferable that ratio of grinding media to material is 1：3～4.
When the mixed processing is mixed using air-flow, alumina powder, water reducer and adjustable solidification agent are put in airflow machine and are mixed,
Incorporation time is 10～145s.
Preferably, when mixing using air-flow, mix 5～30s first under 80～200rpm (rev/min) rotating speed, then
Mix 5～115s under 201～450rpm rotating speeds.
Further preferably, when mixing using air-flow, 15～30s, Ran Hou are mixed first under 130～200rpm rotating speeds
Mix 60～115s under 201～400rpm rotating speeds.
When the mixed processing adopts mist projection granulating, alumina powder, water reducer and adjustable solidification agent are dissolved in suitable solvent, are obtained
To the slip that solid content is 50%～90%, then slip is sprayed in granulation tower carries out mist projection granulating.
After mixed processing, in the dispersibility aluminium oxide for obtaining, water reducer and adjustable solidification agent are coated on the outer of alumina powder
Surface, forms stable composite construction, and when adding in castable, the property of dispersibility aluminium oxide keeps stable.
Preferably, the water reducer is calcium lignosulfonate, sodium tripolyphosphate, sodium hexameta phosphate, polysulfonate class diminishing
At least one in agent, polycarboxylic acids dehydragent.
Polysulfonate class water reducer includes naphthalene sulfonate (such as naphthalene sulfonic acid-formaldehyde condensation product), melamine sulfonate (example
Such as sulfonated melamine compound condensation substance), and sulfamate (such as sulfamic acid formaldehyde condensation products).
Polycarboxylic acid salt's water reducer is copolymer (such as poly- (methyl) acrylic acid of (methyl) acrylic acid and other monomers
Ester).Further preferably, the water reducer is polycarboxylic acids dehydragent.
The dispersibility aluminium oxide that the present invention is prepared is divided into two kinds, a kind of to have deferred action, referred to as retardation setting type dispersion
Property aluminium oxide, it is another kind of that there is blood coagulation enhancing effect, referred to as coagulant type dispersibility aluminium oxide.
By the adding proportion for adjusting retardation setting type dispersibility aluminium oxide and coagulant type dispersibility aluminium oxide, cast can be adjusted
The setting time of material, meet the construction needs under the conditions of Different climate.
In order to obtain acting on different dispersibility aluminium oxidies, correspondingly, the adjustable solidification agent is retarder or coagulant, slow setting
Agent is citric acid, sodium citrate, tartaric acid, oxalic acid, boric acid, phosphate, (mass fraction of sugar is more than high sugar lignosulfonates
18%), at least one in zinc chloride；
Coagulant be caustic-calcined magnesite, calcium chloride, lithium chloride, Calcium Carbonate, calcium aluminate, sodium silicate, in aluminum sulfate at least one
Kind.
When adjustable solidification agent selects retarder, what is obtained is retardation setting type dispersibility aluminium oxide, when adjustable solidification agent is coagulant, obtains
Be coagulant type dispersibility aluminium oxide.
Present invention also offers a kind of castable, aoxidizes containing the dispersibility that preparation method of the present invention is prepared
Aluminum, the mass fraction of dispersibility aluminium oxide is 0.6～1.0%.
The addition of existing water reducer generally 0.05～0.5%, as addition is few, is difficult to divide in castable
Dissipate uniform, dispersibility aluminium oxide addition prepared by the present invention is 0.6～1.0%, can be dispersed in castable, more preferably
Play a role.
The mass fraction of dispersibility aluminium oxide is 0.6～1.0%, refers to retardation setting type dispersibility aluminium oxide and the dispersion of coagulant type
Property aluminium oxide total addition be 0.6～1.0, the addition ratio of retardation setting type dispersibility aluminium oxide and coagulant type dispersibility aluminium oxide
Example is adjusted according to weather conditions, is advisable with obtaining optimal setting time.
Remaining component in castable adopts prior art, i.e., substitute water reducer with the dispersibility aluminium oxide that the present invention is provided
And adjustable solidification agent, remaining component is using prior art.
The preparation method of the dispersibility aluminium oxide that the present invention is provided, process is simple is with low cost, and the dispersion for preparing
Property aluminium oxide be uniformly dispersed in castable, can significantly reduce the amount of water of castable, that improves castable can application property, anti-
Bleeding and early strength.
Description of the drawings
Fig. 1, Fig. 2, Fig. 3 are the microstructure picture of dispersibility aluminium oxide prepared by the present invention.
Specific embodiment
Following examples are intended to illustrate rather than limitation of the invention further, and the present invention can be by invention
Hold described either type to implement.
Embodiment 1～8
(1) by active alpha-Al2O3In corundum ball mill, ball milling obtains alumina powder, active alpha-Al2O3Middle Al2O3Quality
Fraction >=95wt%, ratio of grinding media to material and Ball-milling Time it is as shown in table 1.
According to the ball milling condition shown in table 1, the granularity of the alumina powder for obtaining is while meet D50≤ 10 μm, D90≤20μm。
(2) alumina powder, water reducer and adjustable solidification agent are carried out into mixed processing, obtains dispersibility aluminium oxide, alumina powder, subtracted
The weight of water preparation and adjustable solidification agent is as shown in table 2.
Embodiment 1～3 adopts mechanical mixture, and the ratio of grinding media to material of embodiment 1 is 1：2.5, the ratio of grinding media to material of embodiment 2 is 1：3, it is real
The ratio of grinding media to material for applying example 3 is 1：5, the Ball-milling Time of embodiment 1～3 is 5 hours.
Embodiment 4～6 is mixed using air-flow, and embodiment 4 mixes 120s under 300rpm rotating speeds；Embodiment 5 first exists
Mix 20s under 100rpm rotating speeds, then mix 120s under 300rpm rotating speeds；Embodiment 6 first mixes under 150rpm rotating speeds
20s, then mixes 100s under 450rpm rotating speeds.
Embodiment 7～8 adopts mist projection granulating, will be alumina powder, water reducer and adjustable solidification agent soluble in water, obtains raw material material
Slurry, then will raw material slip spray into granulation tower in be dried pelletize, in embodiment 7 in raw material slip solute mass percent
For 70%；In embodiment 8, in raw material slip, the mass percent of solute is 80%.
Table 1
Table 2
In table 2, X represents retardation setting type dispersibility aluminium oxide, and D represents coagulant type dispersibility aluminium oxide, and each embodiment is distinguished
A kind of retardation setting type dispersibility aluminium oxide of correspondence and a kind of coagulant type dispersibility aluminium oxide.
Comparative example 1
Alumina powder, water reducer and adjustable solidification agent unmixed process is added directly in castable, alumina powder,
The species of water reducer and adjustable solidification agent is selected and weight is with embodiment 5.
Comparative example 2
Sodium hexameta phosphate, tartaric acid and calcium chloride are added directly in castable, the weight of each component in castable
Part is shown in the formula of A with numbering in such as table 3.
Application examples 1～8
The dispersibility aluminium oxide that each embodiment is prepared is added in castable, obtains corresponding application examples (for example,
1), the ingredients weight parts in each application examples are shown in the formula of B with numbering in such as table 3 to the correspondence of embodiment 1 application examples.
Table 3
Performance characterization
The microstructure photograph of the dispersibility aluminium oxide that embodiment 3 is prepared as shown in Figure 1, Figure 2, Figure 3 shows, by can in figure
To find out, in dispersibility aluminium oxide, water reducer and adjustable solidification agent are attached to the outer surface of alumina particle.
The dispersibility aluminium oxide that each embodiment is prepared is added in castable, using fluidity tester, will cast
Material is put in the broach hopper of detector, and the size of broach hopper is upper diameter/lower diameter/height=70/100/60mm, is poured into a mould
Material is fed in broach hopper, and the upper surface of castable is concordant with the upper surface of broach hopper, lifts hopper, and castable flows automatically
Going out and sprawling, measurement makes the amount of water sprawled when diameter reaches 170mm of castable, the diminishing of dispersibility aluminium oxide is characterized with this
Performance.
Table 4
The preparation method process is simple that the present invention is provided, low cost, using effect are good, the dispersibility aluminium oxide for preparing
Main thing mutually be Al2O3, and contain a small amount of Na2The thing phase such as O and CaO, 1050 DEG C of igloss amounts are 10%～25%.
Dispersibility aluminium oxide prepared by the present invention is evenly distributed in castable, makes as the additive of castable refractory
With, water-reducing effect and early strength can be significantly improved, as can be seen from Table 4, dispersibility aluminium oxide prepared by the present invention is used
In castable, amount of water can drop to 4.1% by 5.1%, and the rupture strength after 20 DEG C of maintenance demouldings is improved by 3.0MPa
To 5.4MPa.
Claims (5)
1. a kind of preparation method of the dispersibility aluminium oxide for castable, it is characterised in that comprise the following steps：By aluminium oxide
Powder, water reducer and adjustable solidification agent carry out mixed processing, obtain dispersibility aluminium oxide；The granularity of the alumina powder meets simultaneously：D50
≤ 10 μm, D90≤20μm；The weight of the alumina powder, water reducer and adjustable solidification agent is as follows：
Alumina powder 60～95
Water reducer 5～40
Adjustable solidification agent 0～5；
The mixed processing is using mechanical mixture, air-flow mixing or mist projection granulating；
When the mixed processing adopts mechanical mixture, alumina powder, water reducer and adjustable solidification agent are put in ball grinder and are mixed, ball material
Than for 1：2.5～5；
When the mixed processing is mixed using air-flow, alumina powder, water reducer and adjustable solidification agent are put in airflow machine and are mixed, first
Mix 5～30s under 80～200rpm rotating speeds, then 5～115s of mixing under 201～450rpm rotating speeds；
During using mist projection granulating, in the slip for being used, solid content is 50%～90%.
2. the preparation method of the dispersibility aluminium oxide of castable is used for as claimed in claim 1, it is characterised in that the diminishing
Agent be calcium lignosulfonate, sodium tripolyphosphate, sodium hexameta phosphate, polysulfonate class water reducer, in polycarboxylic acids dehydragent extremely
Few one kind.
3. the preparation method of the dispersibility aluminium oxide of castable is used for as claimed in claim 2, it is characterised in that the tune coagulates
Agent is retarder or coagulant, and retarder is citric acid, sodium citrate, tartaric acid, oxalic acid, boric acid, phosphate, high sugar lignin
At least one in sulfonate, zinc chloride；
Coagulant is caustic-calcined magnesite, calcium chloride, lithium chloride, Calcium Carbonate, calcium aluminate, sodium silicate, at least one in aluminum sulfate.
4. the preparation method of the dispersibility aluminium oxide of castable is used for as claimed in claim 3, it is characterised in that by α-Al2O3
It is put in ball mill, with ratio of grinding media to material 2.5～5：1, ball milling obtains the alumina powder in 3～10 hours.
5. a kind of castable, it is characterised in that containing the preparation method as described in Claims 1 to 4 is arbitrary prepare point
Scattered property aluminium oxide, the mass fraction of dispersibility aluminium oxide is 0.6～1.0%.
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| CN105294137B (en) * | 2015-12-08 | 2017-12-15 | 武汉科技大学 | A kind of dispersed alumina powder and preparation method thereof |
| CN106747510B (en) * | 2016-12-14 | 2020-05-19 | 巩义市科正冶金材料有限公司 | Silicon-powder-free iron runner castable and preparation method thereof |
| CN109467417A (en) * | 2018-12-18 | 2019-03-15 | 河南天马新材料股份有限公司 | A kind of a- alumina powder used for refractory material and preparation method thereof |
| CN111484342B (en) * | 2020-03-13 | 2022-06-24 | 苏州盛曼特新材料有限公司 | Retarding composite water reducing agent for siliceous dust refractory castable and preparation method thereof |
| CN111484341B (en) * | 2020-03-13 | 2021-01-15 | 苏州盛曼特新材料有限公司 | Retarding composite water reducing agent for silica-free refractory self-flowing castable and preparation method thereof |
| CN113045298B (en) * | 2021-03-24 | 2022-12-13 | 苏州盛曼特新材料有限公司 | Alumina-based coagulant for refractory castable and preparation method and application thereof |
| CN113213513B (en) * | 2021-04-14 | 2022-12-13 | 雅安百图高新材料股份有限公司 | Preparation method of large primary crystal alpha-alumina |
| CN113213900A (en) * | 2021-06-23 | 2021-08-06 | 中国铝业股份有限公司 | Dispersible alumina and preparation method and application thereof |
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| CN101016211A (en) * | 2006-12-21 | 2007-08-15 | 武汉科技大学 | Aluminum-magnesium series lightweight pouring material and manufacturing method thereof |
| CN102491772A (en) * | 2011-12-09 | 2012-06-13 | 通达耐火技术股份有限公司 | Preparation method for cement-free castable |
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| CN101921128B (en) * | 2010-09-08 | 2012-09-05 | 武汉钢铁(集团)公司 | Pouring material for lime rotary kiln |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101016211A (en) * | 2006-12-21 | 2007-08-15 | 武汉科技大学 | Aluminum-magnesium series lightweight pouring material and manufacturing method thereof |
| CN102491772A (en) * | 2011-12-09 | 2012-06-13 | 通达耐火技术股份有限公司 | Preparation method for cement-free castable |
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Application publication date: 20150617 Assignee: Shaoxing Hongyi New Material Co.,Ltd. Assignor: ZHEJIANG ZILI ADVANCED MATERIALS Co.,Ltd. Contract record no.: X2021330000208 Denomination of invention: The invention relates to a preparation method of dispersed alumina for castable and castable Granted publication date: 20170329 License type: Common License Record date: 20210831 Application publication date: 20150617 Assignee: Zhejiang Zili High Temperature Technology Co.,Ltd. Assignor: ZHEJIANG ZILI ADVANCED MATERIALS Co.,Ltd. Contract record no.: X2021330000207 Denomination of invention: The invention relates to a preparation method of dispersed alumina for castable and castable Granted publication date: 20170329 License type: Common License Record date: 20210831 |