CN105236995B - Light-weight corundum-spinel castable and preparation method thereof - Google Patents
Light-weight corundum-spinel castable and preparation method thereof Download PDFInfo
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- CN105236995B CN105236995B CN201510550636.8A CN201510550636A CN105236995B CN 105236995 B CN105236995 B CN 105236995B CN 201510550636 A CN201510550636 A CN 201510550636A CN 105236995 B CN105236995 B CN 105236995B
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Abstract
The invention relates to a light-weight corundum-spinel castable and a preparation method thereof. The preparation method includes following steps: (A) employing 60-75 wt% of equal-diameter micro-porous corundum spheres as an aggregate, and employing 8-12 wt% of electric-fused white corundum fine powder, 2-8 wt% of electric-fused magnesite fine powder, 2-8 wt% of magnesium aluminate spinel fine powder, 6-12 wt% of [alpha]-Al2O3 micro powder, 0.5-2.5 wt% of chromium oxide powder and 3-7 wt% of an aluminum silicone gel powder as substrate materials, wherein the aggregate and the substrate materials form a raw material in total; (B) employing organic fibers accounting for 0.02-0.08 wt% of the raw material and a polycarboxylate water reducer accounting for 0.05-0.12 wt% of the raw material as additive materials, pre-mixing the substrate material with the additive materials and adding the aggregate with uniform mixing; (C) adding water accounting for 3-5 wt% of the raw material, stirring the mixture and performing cast moulding; and (D) maintaining the temperature at 110-200 DEG C for 12-48 h, roasting the moulded product at 800-1200 DEG C for 24-72 h to obtain the light-weight corundum-spinel castable. The light-weight corundum-spinel castable is low in apparent porosity, is low in volume density, is low in heat conductivity, is strong in anti-slag-erosion capability and is long in service life.
Description
Technical field
The invention belongs to unshape refractory technical field.Specifically related to a kind of light-weight corundum-spinel pouring material and
Its preparation method.
Background technology
With external refining and the development of continuous casting technology, ladle is gradually changed by the splendid attire steel in water container of original unitary function
It is the outer liquid steel refining equipment of the complicated stove of function, the smelting condition of ladle is increasingly harsh, refractory material used by ladle liner makes
It is also increasingly harsher with condition.Corundum-spinel castable is the new varieties for growing up in recent years, due to its good high temperature
Performance and be used widely, successively popularized in states such as Japan.Technological progress and process for making pair with refractory material
The raising of refractory material requirement, corundum-spinel castable has been used for the position of use condition harshness in ladle, such as punching of bag bottom
Area, RH pipes, air brick system etc. are hit, practical application shows that it has good performance and service life higher.
Two subject matters are primarily present during current lining material in the ladle use：（1）Inner lining material heat transfer
Rate is higher, causes liquid steel temperature to decline very fast, is unfavorable for that continuous casting is smoothed out, and also has considerable influence to steel quality, and
And increased energy consumption；（2）Inner lining material Spalling resistance energy and slag resistance are not excellent enough, particularly different slag systems, steel grade etc.
The otherness of smelting condition lower liner material slag resistance is larger.Work lining refractories lightweight is for solving the above problems
Individual important research direction.First, closer to working face, its heat-insulating and energy-saving effect is better, working lining fire proofed wood for fireclay insulating refractory
Material lightweight can effectively reduce ladle heat and scatter and disappear；Second, it is acute in temperature due to having more stomata in light weight refractory material
Thermal stress can be effectively accommodated during change, material Spalling resistance energy is lifted.Therefore, the research of working lining light weight refractory material is received
To the extensive concern of refractories industry.Particularly lightweight refractory material due to bulk density it is relatively low, stomata is more, slag
Diffusion admittance is more, and its slagging of retractory process is more complicated.This requires that lightweight refractory material has more micro- stomata and can
The ability of anti-slag overcoat is formed under the conditions of wide slag composition, and presently disclosed lightweight refractory material is also difficult to reach
To requiring.
The content of the invention
It is contemplated that overcoming prior art defect, it is therefore an objective to provide that a kind of apparent porosity is low, closed porosity is high, volume
Density is smaller, average pore size is small, thermal conductivity is relatively low and slag-resistant erosiveness is strong light-weight corundum-spinel pouring material and its system
Preparation Method.
To realize above-mentioned task, the technical solution adopted in the present invention is：Isometrical micropore corundum ball with 60 ~ 75wt% is
Aggregate, with the fused white corundum fine powder of 8 ~ 12wt%, the fused magnesite fine powder of 2 ~ 8wt%, the magnesium aluminate spinel micro mist of 2 ~ 8wt%, 6 ~
α-the Al of 12wt%2O3The aluminium Silica hydrogel powder of micro mist, the chromium oxide micro mist of 0.5 ~ 2.5wt% and 3 ~ 7wt% is substrate material, the aggregate
Raw material is with the substrate material sum；To account for the organic fiber of the 0.02 ~ 0.08wt% of raw material and gathering for 0.05 ~ 0.12wt%
Carboxylic acid water reducer is additive.By the percentage composition of the aggregate, the substrate material and the additive, first by the substrate material
It is uniform with additive premix, add the aggregate and mix, then the additional water for accounting for the 3 ~ 5wt% of raw material, stirring is equal
Even, installation mold pours into a mould vibration moulding, is incubated 12 ~ 48 hours under the conditions of 110 ~ 200 DEG C, the demoulding, finally at 800 ~ 1200 DEG C
Under the conditions of toast 24 ~ 72 hours, be obtained light-weight corundum-spinel pouring material.
The preparation method of the isometrical micropore corundum ball is：With the γ-Al of 90 ~ 99wt%2O3The MgO of micro mist and 1 ~ 10wt%
Micro mist is raw material, the additional carbohydrate polymer for accounting for the 5 ~ 15wt% of raw material, is mixed 0.05 ~ 0.8 hour with planetary ball mill；Again
Addition accounts for the water of the 6 ~ 20wt% of raw material, and rotating granulation obtains final product prefabricated ball；By alumina sol and ρ-Al2O3Micro mist is according to matter
Amount is than for (0.04 ~ 0.1) ︰ 1 are mixed into slurry, then the slurry is equably sprayed at the surface of prefabricated ball, are sprayed at prefabricated
The paste thickness of ball surface is (0.05 ~ 0.12) ︰ 1 with the radius ratio of prefabricated ball；Then under the conditions of 110 ~ 200 DEG C dry 12 ~
36 hours, calcined 2 ~ 5 hours under the conditions of 1900 ~ 2100 DEG C in ultra-high temperature shaft kiln, obtain final product isometrical micropore corundum ball.
The grain composition of the isometrical micropore corundum ball is：Particle diameter accounts for raw material for the isometrical micropore corundum ball of 7.5 ~ 8.5mm
25 ~ 30wt%, particle diameter accounts for 10 ~ 15wt% of raw material for the isometrical micropore corundum ball of 4.7 ~ 5.3mm, and particle diameter is isometrical for 2.8 ~ 3.2mm's
Micropore corundum ball accounts for 12 ~ 15wt% of raw material, and particle diameter accounts for 13 ~ 15wt% of raw material for the isometrical micropore corundum ball of 0.8 ~ 1.2mm；
The bulk density of isometrical micropore corundum ball<3.1g/cm3, apparent porosity<6%, core aperture D50<1 μm, ball surface hole
Footpath D50<0.6μm。
The Al of the fused white corundum fine powder2O3Content>99wt%, sphericity>0.4, particle diameter is less than 74 μm.
The content of MgO of the fused magnesite fine powder>97wt%, sphericity>0.4, particle diameter is less than 74 μm.
The Al of the magnesium aluminate spinel micro mist2O3Content>72wt%, sphericity>0.3, particle diameter D50Less than 6 μm.
α-the Al2O3The grain composition of micro mist is：Particle diameter D50It is 2.5 ~ 3.5 μm of α-Al2O3Micro mist account for raw material 4 ~
7wt%, particle diameter D50It is 0.8 ~ 1.2 μm of α-Al2O3Micro mist accounts for 2 ~ 5wt% of raw material；α-Al2O3The Al of micro mist2O3Content>99wt%, ball
Shape degree>0.3.
The Cr of the chromium oxide micro mist2O3Content>95wt%, sphericity>0.3, particle diameter D50Less than 10 μm.
In the aluminium Silica hydrogel powder：Al2O3Content is 60 ~ 80wt%, SiO2Content is 10 ~ 20wt%；Aluminium Silica hydrogel powder
Grain particle diameter D50Less than 1 μm.
γ-the Al2O3The Al of micro mist2O3Content>99.3wt%, particle diameter D50<6μm。
The content of MgO of the MgO micro mists>99wt%, particle diameter D50 <6μm。
The carbohydrate polymer is one or more of dextrin, starch, chitin.
The dispersate content of the alumina sol>25wt%, average grain diameter is 20 ~ 50nm.
ρ-the Al2O3The Al of micro mist2O3Content>99wt%, particle diameter is D50<6μm。
There is following good effect compared with prior art due to using above-mentioned technical proposal, the present invention：
The isometrical micropore corundum ball of the present invention 4 kinds of different-grain diameters of use and the in theory aluminum oxide of closestpacking, magnesia
Etc. matrix powder, the particle packing with certain porosity can be formed at normal temperatures first, then aluminum oxide, magnesia are thin under high temperature
Powder reaction in-situ forms magnesium aluminate spinel and produces expansion, can just fill these larger holes, and larger hole is changed into
Aperture, so as to form close mode matrix.Not only thermal conductivity is low, anti-chilling for light-weight corundum-spinel pouring material prepared by the present invention
Anxious hot, slag resistance is excellent, intensity is high, and castable good fluidity, and particle packing is easily controllable, and raw materials consumption is low.
Light-weight corundum-spinel pouring material prepared by the present invention is after testing：Apparent porosity is 7 ~ 11%, and bulk density is
2.6~2.8g/cm3, 800 DEG C of thermal conductivity factors are 0.3 ~ 0.5W/ (m K), and service life is 220 ~ 300 times.
Therefore, the light-weight corundum-spinel pouring material prepared by the present invention have that apparent porosity is low, bulk density is smaller,
Thermal conductivity is relatively low, slag-resistant erosiveness is strong and the characteristics of long service life.
Specific embodiment
With reference to specific embodiment, the invention will be further described, not limiting of its scope：
To avoid repeating, first that the raw material involved by this specific embodiment and additive Unify legislation is as follows, embodiment
In repeat no more：
The preparation method of the isometrical micropore corundum ball is：With the γ-Al of 90 ~ 99wt%2O3The MgO of micro mist and 1 ~ 10wt%
Micro mist is raw material, the additional carbohydrate polymer for accounting for the 5 ~ 15wt% of raw material, is mixed 0.05 ~ 0.8 hour with planetary ball mill；Again
Addition accounts for the water of the 6 ~ 20wt% of raw material, and rotating granulation obtains final product prefabricated ball；By alumina sol and ρ-Al2O3Micro mist is according to matter
Amount is than for (0.04 ~ 0.1) ︰ 1 are mixed into slurry, then the slurry is equably sprayed at the surface of prefabricated ball, are sprayed at prefabricated
The paste thickness of ball surface is (0.05 ~ 0.12) ︰ 1 with the radius ratio of prefabricated ball；Then under the conditions of 110 ~ 200 DEG C dry 12 ~
36 hours, calcined 2 ~ 5 hours under the conditions of 1900 ~ 2100 DEG C in ultra-high temperature shaft kiln, obtain final product isometrical micropore corundum ball.
The bulk density of the isometrical micropore corundum ball<3.1g/cm3, apparent porosity<6%, core aperture D50<1 μm, ball table
Face footpath D50<0.6μm。
The Al of the fused white corundum fine powder2O3Content>99wt%, sphericity>0.4, particle diameter is less than 74 μm.
The content of MgO of the fused magnesite fine powder>97wt%, sphericity>0.4, particle diameter is less than 74 μm.
The Al of the magnesium aluminate spinel micro mist2O3Content>72wt%, sphericity>0.3, particle diameter D50Less than 6 μm.
The Cr of the chromium oxide micro mist2O3Content>95wt%, sphericity>0.3, particle diameter D50Less than 10 μm.
In the aluminium Silica hydrogel powder：Al2O3Content is 60 ~ 80wt%, SiO2Content is 10 ~ 20wt%；Aluminium Silica hydrogel powder
Grain particle diameter D50Less than 1 μm.
γ-the Al2O3The Al of micro mist2O3Content>99.3wt%, particle diameter D50<6μm。
The content of MgO of the MgO micro mists>99wt%, particle diameter D50 <6μm。
The dispersate content of the alumina sol>25wt%, average grain diameter is 20 ~ 50nm.
ρ-the Al2O3The Al of micro mist2O3Content>99wt%, particle diameter is D50<6μm。
Embodiment 1
A kind of light-weight corundum-spinel pouring material and preparation method thereof.The raw material of the present embodiment and the percentage of additive contain
Amount is：Isometrical micropore corundum ball with 60 ~ 64wt% is aggregate, with the fused white corundum fine powder of 10 ~ 12wt%, the electric smelting of 5 ~ 8wt%
Magnesia powder, the magnesium aluminate spinel micro mist of 2 ~ 4wt%, the α-Al of 10 ~ 12wt%2O3Micro mist, the chromium oxide micro mist of 0.5 ~ 1.5wt% and
The aluminium Silica hydrogel powder of 6 ~ 7wt% is substrate material, and the aggregate is raw material with the substrate material sum；With account for the raw material 0.02 ~
The organic fiber of 0.08wt% and the polycarboxylate water-reducer of 0.05 ~ 0.12wt% are additive.
The preparation method of the present embodiment is：By the percentage composition of the aggregate, the substrate material and the additive, first will
The substrate material is uniform with additive premix, adds the aggregate and mixes, then additional to account for the 3 ~ 5wt%'s of raw material
Water, is stirred, installation mold, pours into a mould vibration moulding, and 30 ~ 48 hours are incubated under the conditions of 110 ~ 160 DEG C, and the demoulding finally exists
Toasted 48 ~ 72 hours under the conditions of 800 ~ 1000 DEG C, light-weight corundum-spinel pouring material is obtained.
The grain composition of the isometrical micropore corundum ball is：Particle diameter accounts for raw material for the isometrical micropore corundum ball of 7.5 ~ 8.5mm
25 ~ 26wt%, particle diameter accounts for 10 ~ 11wt% of raw material for the isometrical micropore corundum ball of 4.7 ~ 5.3mm, and particle diameter is isometrical for 2.8 ~ 3.2mm's
Micropore corundum ball accounts for 12 ~ 13wt% of raw material, and particle diameter accounts for 13 ~ 14wt% of raw material for the isometrical micropore corundum ball of 0.8 ~ 1.2mm；
α-the Al2O3The grain composition of micro mist is：Particle diameter D50It is 2.5 ~ 3.5 μm of α-Al2O3Micro mist account for raw material 6 ~
7wt%, particle diameter D50It is 0.8 ~ 1.2 μm of α-Al2O3Micro mist accounts for 4 ~ 5wt% of raw material；α-Al2O3The Al of micro mist2O3Content>99wt%, ball
Shape degree>0.3.
Light-weight corundum-spinel pouring material prepared by the present embodiment is after testing：Apparent porosity is 7 ~ 9%, and bulk density is
2.7~2.8g/cm3, 800 DEG C of thermal conductivity factors are 0.4 ~ 0.5W/ (m K), and service life is 220 ~ 240 times.
Embodiment 2
A kind of light-weight corundum-spinel pouring material and preparation method thereof.In addition to preparation method, remaining is with implementation for the present embodiment
Example 1.
The preparation method of the present embodiment is：By the percentage composition of the aggregate, the substrate material and the additive, first will
The substrate material is uniform with additive premix, adds the aggregate and mixes, then additional to account for the 3 ~ 5wt%'s of raw material
Water, is stirred, installation mold, pours into a mould vibration moulding, and 12 ~ 30 hours are incubated under the conditions of 150 ~ 200 DEG C, and the demoulding finally exists
Toasted 24 ~ 48 hours under the conditions of 1000 ~ 1200 DEG C, light-weight corundum-spinel pouring material is obtained.
Light-weight corundum-spinel pouring material prepared by the present embodiment is after testing：Apparent porosity is 7 ~ 9%, and bulk density is
2.7~2.8g/cm3, 800 DEG C of thermal conductivity factors are 0.4 ~ 0.5W/ (m K), and service life is 220 ~ 250 times.
Embodiment 3
A kind of light-weight corundum-spinel pouring material and preparation method thereof.The raw material of the present embodiment and the percentage of additive contain
Amount is：Isometrical micropore corundum ball with 63 ~ 67wt% is aggregate, with the fused white corundum fine powder of 10 ~ 12wt%, the electric smelting of 4 ~ 7wt%
Magnesia powder, the magnesium aluminate spinel micro mist of 3 ~ 5wt%, the α-Al of 8 ~ 10wt%2O3The chromium oxide micro mist and 5 of micro mist, 0.5 ~ 1.5wt%
The aluminium Silica hydrogel powder of ~ 6wt% is substrate material, and the aggregate is raw material with the substrate material sum；With account for the raw material 0.02 ~
The organic fiber of 0.08wt% and the polycarboxylate water-reducer of 0.05 ~ 0.12wt% are additive.
The preparation method of the present embodiment is with embodiment 1.
The grain composition of the isometrical micropore corundum ball is：Particle diameter accounts for raw material for the isometrical micropore corundum ball of 7.5 ~ 8.5mm
26 ~ 27wt%, particle diameter accounts for 11 ~ 12wt% of raw material for the isometrical micropore corundum ball of 4.7 ~ 5.3mm, and particle diameter is isometrical for 2.8 ~ 3.2mm's
Micropore corundum ball accounts for 12 ~ 13wt% of raw material, and particle diameter accounts for 14 ~ 15wt% of raw material for the isometrical micropore corundum ball of 0.8 ~ 1.2mm；
α-the Al2O3The grain composition of micro mist is：Particle diameter D50It is 2.5 ~ 3.5 μm of α-Al2O3Micro mist account for raw material 5 ~
6wt%, particle diameter D50It is 0.8 ~ 1.2 μm of α-Al2O3Micro mist accounts for 3 ~ 4wt% of raw material；α-Al2O3The Al of micro mist2O3Content>99wt%, ball
Shape degree>0.3.
Light-weight corundum-spinel pouring material prepared by the present embodiment is after testing：Apparent porosity is 8 ~ 10%, bulk density
It is 2.7 ~ 2.75g/cm3, 800 DEG C of thermal conductivity factors are 0.35 ~ 0.45W/ (m K), and service life is 230 ~ 260 times.
Embodiment 4
A kind of light-weight corundum-spinel pouring material and preparation method thereof.The preparation method of the present embodiment with embodiment 2, its
Remaining same embodiment 3.
Light-weight corundum-spinel pouring material prepared by the present embodiment is after testing：Apparent porosity is 9 ~ 11%, bulk density
It is 2.65 ~ 2.75g/cm3, 800 DEG C of thermal conductivity factors are 0.35 ~ 0.45W/ (m K), and service life is 235 ~ 275 times.
Embodiment 5
A kind of light-weight corundum-spinel pouring material and preparation method thereof.The raw material of the present embodiment and the percentage of additive contain
Amount is：Isometrical micropore corundum ball with 67 ~ 71wt% is aggregate, with the fused white corundum fine powder of 18 ~ 10wt%, the electric smelting of 3 ~ 6wt%
Magnesia powder, the magnesium aluminate spinel micro mist of 4 ~ 7wt%, the α-Al of 7 ~ 9wt%2O3Micro mist, the chromium oxide micro mist of 1.5 ~ 2.5wt% and 4 ~
The aluminium Silica hydrogel powder of 5wt% is substrate material, and the aggregate is raw material with the substrate material sum；With account for the raw material 0.02 ~
The organic fiber of 0.08wt% and the polycarboxylate water-reducer of 0.05 ~ 0.12wt% are additive.
The preparation method of the present embodiment is with embodiment 1.
The grain composition of the isometrical micropore corundum ball is：Particle diameter accounts for raw material for the isometrical micropore corundum ball of 7.5 ~ 8.5mm
27 ~ 28wt%, particle diameter accounts for 12 ~ 13wt% of raw material for the isometrical micropore corundum ball of 4.7 ~ 5.3mm, and particle diameter is isometrical for 2.8 ~ 3.2mm's
Micropore corundum ball accounts for 13 ~ 14wt% of raw material, and particle diameter accounts for 15 ~ 16wt% of raw material for the isometrical micropore corundum ball of 0.8 ~ 1.2mm；
α-the Al2O3The grain composition of micro mist is：Particle diameter D50It is 2.5 ~ 3.5 μm of α-Al2O3Micro mist account for raw material 5 ~
6wt%, particle diameter D50It is 0.8 ~ 1.2 μm of α-Al2O3Micro mist accounts for 2 ~ 3wt% of raw material；α-Al2O3The Al of micro mist2O3Content>99wt%, ball
Shape degree>0.3.
Light-weight corundum-spinel pouring material prepared by the present embodiment is after testing：Apparent porosity is 8 ~ 11%, bulk density
It is 2.65 ~ 2.75g/cm3, 800 DEG C of thermal conductivity factors are 0.3 ~ 0.45W/ (m K), and service life is 240 ~ 280 times.
Embodiment 6
A kind of light-weight corundum-spinel pouring material and preparation method thereof.The preparation method of the present embodiment with embodiment 2, its
Remaining same embodiment 5.
Light-weight corundum-spinel pouring material prepared by the present embodiment is after testing：Apparent porosity is 8 ~ 10%, bulk density
It is 2.7 ~ 2.75g/cm3, 800 DEG C of thermal conductivity factors are 0.3 ~ 0.45W/ (m K), and service life is 270 ~ 290 times.
Embodiment 7
A kind of light-weight corundum-spinel pouring material and preparation method thereof.The raw material of the present embodiment and the percentage of additive contain
Amount is：Isometrical micropore corundum ball with 71 ~ 75wt% is aggregate, with the fused white corundum fine powder of 8 ~ 10wt%, the electric smelting of 2 ~ 4wt%
Magnesia powder, the magnesium aluminate spinel micro mist of 5 ~ 8wt%, the α-Al of 6 ~ 8wt%2O3Micro mist, the chromium oxide micro mist of 1.5 ~ 2.5wt% and 3 ~
The aluminium Silica hydrogel powder of 4wt% is substrate material, and the aggregate is raw material with the substrate material sum；With account for the raw material 0.02 ~
The organic fiber of 0.08wt% and the polycarboxylate water-reducer of 0.05 ~ 0.12wt% are additive.
The preparation method of the present embodiment is with embodiment 1.
The grain composition of the isometrical micropore corundum ball is：Particle diameter accounts for raw material for the isometrical micropore corundum ball of 7.5 ~ 8.5mm
28 ~ 29wt%, particle diameter accounts for 13 ~ 14wt% of raw material for the isometrical micropore corundum ball of 4.7 ~ 5.3mm, and particle diameter is isometrical for 2.8 ~ 3.2mm's
Micropore corundum ball accounts for 14 ~ 15wt% of raw material, and particle diameter accounts for 16 ~ 17wt% of raw material for the isometrical micropore corundum ball of 0.8 ~ 1.2mm；
α-the Al2O3The grain composition of micro mist is：Particle diameter D50It is 2.5 ~ 3.5 μm of α-Al2O3Micro mist account for raw material 4 ~
5wt%, particle diameter D50It is 0.8 ~ 1.2 μm of α-Al2O3Micro mist accounts for 2 ~ 3wt% of raw material；α-Al2O3The Al of micro mist2O3Content>99wt%, ball
Shape degree>0.3.
Light-weight corundum-spinel pouring material prepared by the present embodiment is after testing：Apparent porosity is 8 ~ 11%, bulk density
It is 2.6 ~ 2.7g/cm3, 800 DEG C of thermal conductivity factors are 0.3 ~ 0.4W/ (m K), and service life is 270 ~ 300 times.
Embodiment 8
A kind of light-weight corundum-spinel pouring material and preparation method thereof.Preparation method with embodiment 2, remaining same embodiment
7。
Light-weight corundum-spinel pouring material prepared by the present embodiment is after testing：Apparent porosity is 9 ~ 11%, bulk density
It is 2.6 ~ 2.65g/cm3, 800 DEG C of thermal conductivity factors are 0.3 ~ 0.4W/ (m K), and service life is 280 ~ 300 times.
This specific embodiment has following good effect compared with prior art：
Isometrical micropore corundum ball and the in theory oxidation of closestpacking of this specific embodiment using 4 kinds of different-grain diameters
The matrix powder such as aluminium, magnesia, can form the particle packing with certain porosity at normal temperatures first, then be aoxidized under high temperature
Aluminium, magnesia powder reaction in-situ form magnesium aluminate spinel and produce expansion, these larger holes can be just filled, by larger hole
Gap is changed into aperture, so as to form close mode matrix.Light-weight corundum-spinel pouring material prepared by this specific embodiment is not only
Thermal conductivity is low, anti-rapid heat cycle, slag resistance are excellent, intensity is high, and castable good fluidity, and particle packing is easy to control
System, raw materials consumption is low.
Light-weight corundum-spinel pouring material prepared by this specific embodiment is after testing：Apparent porosity is 7 ~ 11%, body
Product density is 2.6 ~ 2.8g/cm3, 800 DEG C of thermal conductivity factors are 0.3 ~ 0.5W/ (m K), and service life is 220 ~ 300 times.
Therefore, the light-weight corundum-spinel pouring material prepared by this specific embodiment has that apparent porosity is low, volume is close
The characteristics of spending relatively low smaller, thermal conductivity, strong slag-resistant erosiveness and long service life.
Claims (13)
1. a kind of preparation method of light-weight corundum-spinel pouring material, it is characterised in that firm with the isometrical micropore of 60~75wt%
Beautiful ball be aggregate, with the fused white corundum fine powder of 8~12wt%, the fused magnesite fine powder of 2~8wt%, 2~8wt% magnalium
α-the Al of Spinel micropowder, 6~12wt%2O3The aluminium Silica hydrogel of micro mist, the chromium oxide micro mist of 0.5~2.5wt% and 3~7wt%
Powder is substrate material, and the aggregate is raw material with the substrate material sum；To account for the organic of the 0.02~0.08wt% of raw material
The polycarboxylate water-reducer of fiber and 0.05~0.12wt% is additive；By the aggregate, the substrate material and the additive
Percentage composition, it is first that the substrate material and additive premix is uniform, add the aggregate and mix, it is then additional to account for institute
State the water of 3~5wt% of raw material, stir, installation mold, pour into a mould vibration moulding, under the conditions of 110~200 DEG C be incubated 12~
48 hours, the demoulding was finally toasted 24~72 hours under the conditions of 800~1200 DEG C, and light-weight corundum-spinel pouring material is obtained；
The preparation method of the isometrical micropore corundum ball is：With the γ-Al of 90~99wt%2O3The MgO of micro mist and 1~10wt%
Micro mist is raw material, the additional carbohydrate polymer for accounting for the 5~15wt% of raw material, is mixed 0.05~0.8 hour with planetary ball mill；
The water for accounting for the 6~20wt% of raw material is added, rotating granulation obtains final product prefabricated ball；By alumina sol and ρ-Al2O3Micro mist is pressed
According to mass ratio for (0.04~0.1) ︰ 1 are mixed into slurry, then the slurry is equably sprayed at the surface of prefabricated ball, are sprayed at
The paste thickness of prefabricated ball surface is (0.05~0.12) ︰ 1 with the radius ratio of prefabricated ball；Then done under the conditions of 110~200 DEG C
Dry 12~36 hours, calcined 2~5 hours under the conditions of 1900~2100 DEG C in ultra-high temperature shaft kiln, obtain final product isometrical micropore corundum ball；
The grain composition of the isometrical micropore corundum ball is：Particle diameter be 7.5~8.5mm isometrical micropore corundum ball account for raw material 25~
30wt%, particle diameter is that the isometrical micropore corundum ball of 4.7~5.3mm accounts for 10~15wt% of raw material, particle diameter be 2.8~3.2mm etc.
Footpath micropore corundum ball accounts for 12~15wt% of raw material, particle diameter be 0.8~1.2mm isometrical micropore corundum ball account for raw material 13~
15wt%；
The bulk density of isometrical micropore corundum ball<3.1g/cm3, apparent porosity<6%, core aperture D50<1 μm, ball surface aperture
D50<0.6μm。
2. the preparation method of light-weight corundum-spinel pouring material according to claim 1, it is characterised in that the electric smelting is white
The Al of corundum fine powder2O3Content>99wt%, sphericity>0.4, particle diameter is less than 74 μm.
3. the preparation method of light-weight corundum-spinel pouring material according to claim 1, it is characterised in that the electric-melting magnesium
The content of MgO of sand fine powder>97wt%, sphericity>0.4, particle diameter is less than 74 μm.
4. the preparation method of light-weight corundum-spinel pouring material according to claim 1, it is characterised in that the magnalium point
The Al of spar micro mist2O3Content>72wt%, sphericity>0.3, particle diameter D50Less than 6 μm.
5. the preparation method of light-weight corundum-spinel pouring material according to claim 1, it is characterised in that the α-Al2O3
The grain composition of micro mist is：Particle diameter D50It is 2.5~3.5 μm of α-Al2O3Micro mist accounts for 4~7wt% of raw material, particle diameter D50For 0.8~
1.2 μm of α-Al2O3Micro mist accounts for 2~5wt% of raw material；α-Al2O3The Al of micro mist2O3Content>99wt%, sphericity>0.3.
6. the preparation method of light-weight corundum-spinel pouring material according to claim 1, it is characterised in that the chromium oxide
The Cr of micro mist2O3Content>95wt%, sphericity>0.3, particle diameter D50Less than 10 μm.
7. the preparation method of light-weight corundum-spinel pouring material according to claim 1, it is characterised in that the aluminium silicon coagulates
In rubber powder：Al2O3Content is 60~80wt%, SiO2Content is 10~20wt%；The grain diameter D of aluminium Silica hydrogel powder50Less than 1 μ
m。
8. the preparation method of light-weight corundum-spinel pouring material according to claim 1, it is characterised in that the γ-
Al2O3The Al of micro mist2O3Content>99.3wt%, particle diameter D50<6μm。
9. the preparation method of light-weight corundum-spinel pouring material according to claim 1, it is characterised in that the MgO is micro-
The content of MgO of powder>99wt%, particle diameter D50<6μm。
10. the preparation method of light-weight corundum-spinel pouring material according to claim 1, it is characterised in that the carbohydrate
Polymer is one or more of dextrin, starch, chitin.
The preparation method of 11. light-weight corundum-spinel pouring materials according to claim 1, it is characterised in that the oxidation
The dispersate content of Alumina gel>25wt%, average grain diameter is 20~50nm.
The preparation method of 12. light-weight corundum-spinel pouring materials according to claim 1, it is characterised in that the ρ-
Al2O3The Al of micro mist2O3Content>99wt%, particle diameter is D50<6μm。
13. a kind of light-weight corundum-spinel pouring materials, it is characterised in that the light-weight corundum-spinel pouring material is according to power
Profit requires the light-weight corundum-point prepared by the preparation method of the light-weight corundum-spinel pouring material any one of 1~12
Spar castable.
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