CN101045636A - Alumina base andalusite-SiC-C brick, manufacturing method and its application - Google Patents
Alumina base andalusite-SiC-C brick, manufacturing method and its application Download PDFInfo
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- CN101045636A CN101045636A CN 200710040413 CN200710040413A CN101045636A CN 101045636 A CN101045636 A CN 101045636A CN 200710040413 CN200710040413 CN 200710040413 CN 200710040413 A CN200710040413 A CN 200710040413A CN 101045636 A CN101045636 A CN 101045636A
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Abstract
An alumine-based andalusite-SiC-C brick used for the 300-ton molten iron ladle with long service life features that two kinds of andalusite are used to take part in mullite reaction to form the mullite network frame, and Al powder and Si powder are used for improving its antioxidizing performance and medium-and high-temp physical properties. Its preparing process includes pugging, shaping, baking, etc.
Description
Technical field
The present invention relates to a kind of ladle lining refractory material for working layer alumina base andalusite-SiC-C brick, making method and application, relate in particular to a kind of alumina base andalusite-SiC-C brick and compound method, belong to fire resisting material field by particle such as special grade bauxite, high-quality andaluzite, silicon carbide, crystalline flake graphite, sintered alumina and the preparation of fine powder grating.
Background technology
Iron ladle is a kind of large-scale splendid attire and the equipment that transports high temperature liquid iron, in early time, the container that iron ladle only transports and stores as molten iron, general clay brick, high alumina brick or the andalusite brick of adopting built by laying bricks or stones, when transporting the strong molten iron of perviousness, adopt the high high alumina brick of corundum content, adopt andaluzite carbon brick and corundum carbon brick to build by laying bricks or stones at the position of wearing and tearing especially severe.
In modernized Steel Plant, iron ladle not only as the container of molten iron transportation and storage, also is used as desulfurizing iron, dephosphorization, desiliconization " three take off " equipment of pretreatment simultaneously.Along with making steel to improving constantly that molten steel quality requires, " three take off " pre-treatment ratio is increasing, high alumina brick originally, alumina chrome brick, Al
2O
3Material systems such as-SiC brick, alabaster-SiC brick, konite brick, oil immersion clay brick can not satisfy service requirements, and in order to reach the service requirements of iron ladle, people have developed again and do not burnt Al
2O
3-SiC-C brick (being called for short the ASC brick), Al
2O
3The erosion of anti-various treatment agent slags.The thermal conductivity of C is good, and thermal shock resistance is significantly improved, and can stop the infiltration of slag, improves antistripping and resistance to fouling.SiC can obviously improve the antioxidant property of brick, prevents the C oxidation, improves thermal shock resistance.In addition, interpolation metal etc. can significantly improve the hot strength of brick, and the pore size of brick is diminished, and improves anti-mechanical erosion, abradability, also is effective anti-oxidizing agent simultaneously.And because the working conditions of the refractory materials at its each position has certain difference, thereby the damaged condition of refractory materials and speed are also different, for the refractory materials that makes its each position reaches synchronous melting loss, on different sites, adopt the ASC brick of different class, carry out integrated masonry, obtained good result of use, this also is the material-structure that extensively adopts at present domestic and even the world wide, the specific targets such as the following table 1 of the ASC brick that adopts at iron ladle:
Table 1
| Project | Al 2O 3％ | SiC％ | C％ | Volume density g/m | Apparent porosity % | Compressive strength Mpa |
| Index | ≥55 | ≥8 | ≥10 | ≥2.70 | ≤12 | ≥40 |
But in iron ladle life-time service process, be subjected to: when 1. adorning molten iron, the direct intense impact abrasive action of molten iron; 2. pretreating agent (CaO, CaF
2, Na
2CO
3) be extensive use of the basicity (CaO/SiO of slag
2) change greatly, from more than 0.5～3.0, chemical erosion is serious; 3. the intensive air-flow stirs the erosive wear effect of molten iron and slag when handling because " three take off " jets; 4. iron ladle slack tank temperature is 700 ℃～800 ℃ and flows into jar strong thermal shock effect of 1450 ℃ interior～1500 ℃ of blast-melted generations.Among this ten minutes rigorous environment, the ASC brick of iron ladle anomalous structure usually occurs and peels off, and phenomenons such as serious melting loss of impact zone and crack propagation cause certain hidden danger for the safe operation of this main equipment.
On to existing ASC brick systems analysis basis, find particles of aggregates based on alumina, fused corundom, be equipped with silicon carbide, crystalline flake graphite is the matrix material, add a kind of or do not add metal additive, resol or phosphoric acid be combined into.Material is in the temperature gradient of using, especially descend bigger in medium and high temperature strength, itself does not have swelling property, material coefficient of thermal expansion is difficult to offset the contraction of cooling, anomalous structure peel off be since intensive thermal shocking effect and molten iron, scum along the continuous infiltration of crackle or brickwork joint, cause material inside rotten due to, the serious melting loss of impact zone is directly related with the hot strength of material, and the contraction that the contraction inner mainly due to material in life-time service and the brickwork joint chamotte of bag wall crack propagation causes brickwork joint is constantly expanded.Clear and definite cause occurring the reason that these damage phenomenons, it is to solve following two problems that the inventor attempts emphasis: 1. optimize the component property of material, reduce infiltration, improve hot strength; 2. reduce the bag wall crack propagation that the later stage occurs.The present invention that Here it is is different from the basic point of departure of prior art.
Summary of the invention
The object of the present invention is to provide a kind of compound method and application thereof of ladle lining refractory material for working layer-alumina base andalusite-SiC-C brick.
Characteristics of the present invention are by 1. having introduced the andaluzite of two specifications, make at material internal and form good mullite network, produce certain volumetric expansion, strengthened wear resistance at elevated temperature, thermal shock resistance and creep-resistant property, reduce anomalous structure and peel off and phenomenon such as crack propagation; 2. the compound interpolation of metallic aluminium powder and metallic silicon power significantly improves the medium and high temperature physicals of material, and to the antioxidant property effect of having greatly improved of material, to reduce the melting loss of impact zone.
Particularly, the physical and chemical index of the main raw material(s) of alumina base andalusite-SiC-C brick provided by the invention such as following table 2:
Table 2
| Title | Al 2O 3 | SiO 2 | Fe 2O 3 | TiO 2 | T.C | SiC | Absorption moisture content |
| Alumina | 89.83 | - | 1.15 | 3.0 | - | - | - |
| Andaluzite | 55.34 | 42.73 | 1.20 | - | - | - | - |
| Silicon carbide | - | - | - | - | - | 95.36 | - |
| Crystalline flake graphite | - | - | - | - | 96.37 | - | 0.32 |
| Fused brown corundum | 94.67 | 1.0 | 0.18 | 2.59 | 0.07 | - | - |
| Alumina powder | 99.56 | 0.05 | 0.02 | K 2O+Na 2O＝0.22 | D 50＝5μm | ||
| Metallic aluminium powder | Active A l=95.20% | - | - | - | Granularity≤45 μ m 〉=90% | ||
| Metallic silicon power | Si＝97.32％ | - | - | - | Granularity≤45 μ m 〉=90% | ||
The concrete mass percent of forming is:
8-5mm alumina 10-15%
5-3mm alumina 10-20%
3-1mm andaluzite 10-25%
≤ 1mm andaluzite 10-25%
≤ 1mm silicon carbide 1-15%
≤ 45 μ m silicon carbide 1-10%
≤ 0.15mm crystalline flake graphite 1-10%
≤ 75 μ m fused brown corundum 1-10%
Additive: A: Alpha-alumina micro mist 1～5%
B: metallic aluminium powder 0.5～3%
C: metallic silicon power 0.5～3%
Add wedding agent: liquid phenolic resin 3～5%
From said components, can know and find out:
1. introduced andaluzite in the particle, because andaluzite is a kind of anhydrous Al
2O
3-SiO
2Be mineral, be heated to after 1350 ℃～1400 ℃, begin deeply to change into gradually from particle surface～medium column or needle-like mullite about 20 μ m, and the transformation efficiency height, but mullitization speed is moderate, does not have kyanite Na What fast.
Andaluzite becomes in the process of mullite at thermal conversion, can form good mullite network, volumetric expansion about 3～5.4% in the matter brick structure, and this is that a kind of irreversible crystal transforms, once conversion, then have higher fire performance, refractoriness can reach more than 1800 ℃, and anti-rapid heat cycle, physical strength is big, and heat shock resistance power is strong, and slag resistance is strong, loading point of inversion height, and have high chemical stability (even not being dissolved in hydrofluoric acid) and extremely strong resistance to chemical corrosion.The firm mullite network frame that forms in the structure on the whole, even there is its creep rate of more relatively glassy phase also better relatively, so the pure more good more impurity of andaluzite mineral is few more, the glassy phase of formation is just few more.And the α-Al that in component, adds
2O
3Micro mist (D
50=5 μ m) activity is very high, at a lower temperature the SiO that just can be decomposed to form with andaluzite stone
2The secondary mullite reaction takes place, make mullite content increase in the composition, it is perfect that the mullite network more becomes, and further compensated the contraction that stress causes, creep-resistant property further improves.The loading temperature becomes forward relevant mutually with creep resistance.So loading invert point height, its creep resistance is good.And under the situation that has an amount of SiC fine powder to exist, can promote the growth of mullite crystal, improve the weave construction of material and promote the sintering of material.
2. introduced the andaluzite of two kinds of specifications, because the andaluzite reactive behavior difference of different size, thereby the solid state reaction that mullite is transformed has long-lasting.It is long-lasting to make that bulking effect has in using for a long time, and the thermal expansivity of andaluzite aggregate and alumina, corundum etc. is inconsistent, after burning, produced tiny crack in the sample, can further improve the thermal shock resistance of material and reduce the crack propagation that the later stage occurs.
3. the compound interpolation of metallic aluminium powder and metallic silicon power, compound interpolation Al, Si are owing to reduced Al
4C
3Generation temperature with AlN, improvement to the antioxidant property of material has very big effect, and can significantly improve the medium and high temperature physicals of material, experiment shows, metal A l helps the middle temperature physicals of material and the antioxidant property of medium and high temperature improves, and is little to the high-temperature behavior influence of material; Metal Si can improve the high-temperature physical property and the oxidation-resistance of material owing to the generation of SiC.The mode of reasonably combined employing composite additive makes different additives in the different different effects of temperature stage performance, can significantly improve the physicals of material, employed aluminium powder and silica flour≤45 μ m, quality percentage composition 〉=90%.
Alumina base andalusite-SiC-C brick novelty provided by the invention is embodied in (1) and has used the andaluzite of two specifications to improve loading point of inversion, anti-suddenly cold and hot performance, the slag resistance of material, has produced microdilatancy and make that bulking effect has in using for a long time long-lasting; (2) the compound interpolation of metallic aluminium powder and metallic silicon power has significantly improved the medium and high temperature physicals and the antioxidant property (seeing embodiment and table 3 for details) of material.
Compounding and production process by alumina base andalusite-SiC-C brick provided by the invention is:
A) earlier with alumina and andaluzite particulate material institute stirring and evenly mixing 3-5 minute,
B) added wedding agent mixing again 3-5 minute,
C) add the mixing 8-10 of crystalline flake graphite minute then,
D) after step (c) is mixing, added silicon carbide, fused brown corundum and alumina powder, metallic aluminium powder and metallic silicon power more mixing again 10-15 minute;
By the weighing of above-mentioned weight proportion of composing;
Carrying out material according to accompanying drawing 1 hybrid technique system mixes;
Need adopt corresponding brick pressing machine to press brick according to the brick type, moulding pressure is controlled between 150～200MPa.
Under 180～200 ℃ temperature, toast 15～20 hours stand-by.
And, be subjected to 1410～1430 ℃ of iron temperature, the basicity CaO/SiO of slag by on probation on 300 tons of hot metal ladle of Steel Plant
2=2.32, be sweetening agent with metal magnesium powder and quickened lime, the desulfurization ratio is 50%.Bring up to 700～800 stoves from original 400～500 stoves, reached good result of use, see accompanying drawing 2 (a, b) with existing product (366 stove) contrast photo when using the same period.Anomalous structure is peeled off remarkable minimizing, and the impact zone melting loss alleviates and wraps wall crack propagation phenomenon and is effectively suppressed, and the general safety performance is good, has good market outlook.
Description of drawings
Calendering process when Fig. 1 alumina base andalusite-SiC-C brick provided by the invention is made.
Original ASC brick of Fig. 2 (a) and alum base andalusite-SiC-C brick provided by the invention (b) use the pattern contrast of 366 stoves under similarity condition.
Embodiment
Further illustrate substantive distinguishing features of the present invention and obvious improvement below by specific embodiment.
Embodiment 1
Provide alumina base andalusite-SiC-C brick to contain Al
2O
3Mass percent is 51.6, SiC is 12.8, C is 10.6.Concrete proportioning is a 8-5mm alumina 12%, 5-3mm alumina 20%, 3-1mm andaluzite 20% ,≤1mm andaluzite 15%, ≤ 1mm silicon carbide 7%, ≤ 45 μ m silicon carbide 7% ,≤0.15mm crystalline flake graphite 10% ,≤75 μ m fused brown corundums 6%, Alpha-alumina micro mist 1.4%, metallic aluminium powder 0.8%, metallic silicon power 0.8%, phenolic resin binder 3.8%.After the prescription weighing, produce by production technique, stand-by.Its index is detailed to be shown in Table 3.
Embodiment 2
Provide alumina base andalusite-SiC-C brick to contain Al
2O
3Mass percent is 56.7, SiC is 9.5, C is 8.1.Concrete proportioning is a 8-5mm alumina 15%, 5-3mm alumina 18%, 3-1mm andaluzite 13% ,≤1mm andaluzite 23%, ≤ 1mm silicon carbide 5%, ≤ 45 μ m silicon carbide 5% ,≤0.15mm crystalline flake graphite 7% ,≤75 μ m fused brown corundums 8%, Alpha-alumina micro mist 4%, metallic aluminium powder 1.0%, metallic silicon power 1.0%, phenolic resin binder 4.5%.After the prescription weighing, produce by production technique, stand-by.Its index sees table 3 for details.
Product provided by the invention after testing and the contrast of existing product index are as shown in table 3:
Table 3
| Project | Condition | Comparative example | Embodiment 1 | Embodiment 2 | |
| Al 2O 3％ | 56.2 | 51.6 | 56.7 | ||
| SiC％ | 8.9 | 12.8 | 9.5 | ||
| C％ | 10.34 | 10.6 | 8.1 | ||
| Volume density g/cm 3 | 2.73 | 2.83 | 2.86 | ||
| Apparent porosity % | 11.2 | 6.8 | 7.6 | ||
| Compressive strength MPa | 200℃*16h | 43 | 42 | 45 | |
| 800 ℃ of * 3h (burying carbon) | 18 | 35 | 36 | ||
| 1450 ℃ of * 3h (burying carbon) | 26 | 43 | 47 | ||
| High temperature break resistant intensity MPa (burying carbon) | 1400℃*0.5h | 6.4 | 9.9 | 12.7 | |
| Once burn the back line and change % | 1450℃*3h | -0.3 | +0.4 | +0.6 | |
| Secondary burns the back line and changes % | 1450℃*3h | -0.5 | +0.3 | +0.4 | |
| Burn the back line for three times and change % | 1450℃*3h | -0.8 | +0.3 | +0.3 | |
| Refractoriness under load ℃ | T 0.6 | 1620 | ≥1700 | ≥1700 | |
| Slag resistance | Corrode mm | 1500℃*3h | 4.2 | 2.6 | 2.8 |
| Infiltration mm | 1500℃*3h | 1.6 | 1.3 | 1.2 | |
Claims (10)
1, a kind of alumina base andalusite-SiC-C brick is characterized in that the quality percentage composition of described alumina base andalusite-SiC-C brick is:
8-5mm alumina 10-15%
5-3mm alumina 10-20%
3-1mm andaluzite 10-25%
≤ 1mm andaluzite 10-25%
≤ 1mm silicon carbide 1-15%
≤ 45 μ m silicon carbide 1-10%
≤ 0.15mm crystalline flake graphite 1-10%
≤ 75 μ m fused brown corundum 1-10%
Additive: A: Alpha-alumina micro mist 1～5%
B: metallic aluminium powder 0.5～3%
C: metallic silicon power 0.5～3%
Add wedding agent: liquid phenolic resin 3～5%.
2,, it is characterized in that forming the mullite network frame in the one-piece construction of described matter brick by the described alumina base andalusite-SiC-C brick of claim 1.
3, by the described alumina base andalusite-SiC-C brick of claim 1, it is characterized in that
1. described α-Al
2O
3The D of micro mist
50=5 μ m;
The particle diameter of 2. described metallic aluminium powder and metallic silicon power all is less than or equal to 45 μ m, quality percentage composition 〉=90%.
4,, it is characterized in that it is 8-5mm alumina 12% that described matter brick mass percent is formed, 5-3mm alumina 20% by the described alumina base andalusite-SiC-C brick of claim 1,3-1mm andaluzite 20%, ≤ 1mm andaluzite 15% ,≤1mm silicon carbide 7% ,≤45 μ m silicon carbide 7%, ≤ 0.15mm crystalline flake graphite 10%, ≤ 75 μ m fused brown corundums 6%, Calcined polishing aluminum oxide micro mist 1.4%, metallic aluminium powder 0.8%, metallic silicon power 0.8%, phenolic resin binder 3.8%.
5,, it is characterized in that it is 8-5mm alumina 15% that described matter brick mass percent is formed, 5-3mm alumina 18% by the described alumina base andalusite-SiC-C brick of claim 1,3-1mm andaluzite 13%, ≤ 1mm andaluzite 23% ,≤1mm silicon carbide 5% ,≤45 μ m silicon carbide 5%, ≤ 0.15mm crystalline flake graphite 7%, ≤ 75 μ m fused brown corundums 8%, Calcined polishing aluminum oxide micro mist 4%, metallic aluminium powder 1.0%, metallic silicon power 1.0%, phenolic resin binder 4.5%.
6, make the method for alumina base andalusite-SiC-C brick as claimed in claim 1, it is characterized in that making step is:
1. in the weighing of the described quality percentage composition of claim 1 ratio;
2. mixing
A) earlier with alumina and andaluzite particulate material institute stirring and evenly mixing 3-5 minute,
B) added wedding agent mixing again 3-5 minute,
C) add the mixing 8-10 of crystalline flake graphite minute then,
D) after step (c) is mixing, added silicon carbide, fused brown corundum and alumina powder, metallic aluminium powder and metallic silicon power more mixing again 10-15 minute;
3. need adopt corresponding brick pressing machine to press brick by the brick type;
4. baking is stand-by under 180-200 ℃ of temperature.
7, by the making method of the described alumina base andalusite-SiC-C brick of claim 6, it is characterized in that moulding pressure is 150-200MPa.
8, the making method of alumina base andalusite-SiC-C brick as claimed in claim 6 is characterized in that the 4. middle storing time of step is 15-20 hour.
9, by the application of the described alumina base andalusite-SiC-C brick of claim 1, it is characterized in that described alumina base andalusite-SiC-C brick is used for 300 tons of hot metal ladle, work-ing life, raising reached the 700-800 stove.
10, by the application of the described alumina base andalusite-SiC-C brick of claim 8, anomalous structure is peeled off minimizing after it is characterized in that using, the impact zone melting loss alleviates, wraps the wall crack propagation and suppresses.
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|---|---|---|---|
| CNB2007100404132A CN100439290C (en) | 2007-05-08 | 2007-05-08 | Alumina base andalusite-SiC-C brick, manufacturing method and its application |
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