CN100337978C - Highly heatproof and shockproof mullite-cordierite refractory composition - Google Patents
Highly heatproof and shockproof mullite-cordierite refractory composition Download PDFInfo
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- CN100337978C CN100337978C CNB2006100377944A CN200610037794A CN100337978C CN 100337978 C CN100337978 C CN 100337978C CN B2006100377944 A CNB2006100377944 A CN B2006100377944A CN 200610037794 A CN200610037794 A CN 200610037794A CN 100337978 C CN100337978 C CN 100337978C
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Abstract
The present invention relates to a refractory material, particularly to a refractory material with high thermal shock resistance for a ceramic burner of an ironmaking hot-blast stove. The present invention is characterized in that the present invention is basically composed of 30 to 50 wt% of synthesized mullite, 15 to 25 wt% of synthesized cordierite, 10 to 20 wt% of sillimanite, 5 to 10 wt% of andalusite, 5 to 10 wt% of alpha alumina submicron powder and 4 to 6 wt% of clay. The present invention retains the excellent performance of the original cordierite refractory material, greatly improves the thermal shock resistance and room temperature compressive strength, has excellent comprehensive performance, and is used for the ironmaking hot-blast stove of a steel plant. Analog experiments prove that the present invention can reach the service life of 20 to 25 years of one generation stove age. The present invention is suitable for occasions with the large temperature change requirement, high thermal shock stability requirement and no special working atmosphere requirement.
Description
Technical field
The present invention relates to a kind of refractory materials, the ceramic combustor of hot-blast stove of especially smelting iron highly heatproof and shockproof refractory materials.
Background technology
Steel mill's long-term use temperature of iron-making heat wind furnace and is mended the cold wind process and is made that temperature variation is violent in the stove about 1200-1350 ℃, and need stand the chemical erosion that blast furnace gas is brought dust into, and combustion gases wash away and severe condition such as mechanical load strongly.Require the ceramic combustor of hot-blast stove refractory materials, remove that the creep that possesses common refractory materials is little, refractoriness under load is high, the big characteristics of thermal capacity, especially requirement possesses anti-thermal shock good stability, intensity height.
It is high alumina matter cordierite refractory material that prior art is selected principal crystalline phase for use, by the natural mullite of 40-50%wt, and the 10-15%wt trichroite, the 10-20%wt alumina, the 10-15%wt clay is formed.This fire proofing composition is used to smelt iron ceramic combustor of hot-blast stove, main deficiency is that heat-shock resistance is lower, 30 times/1100 ℃ water-cooleds, higher temperature line changes greatly, and volume stability is poor, is easy to generate shrinkage cracking, and products machinery intensity is relatively low, compressive strength is generally less than 30Mpa, so work-ing life is shorter, especially can not be applicable to the large blast furnace that long furnace life requires (1800M for example
3And more than).
In addition, also deposit employing by the natural mullite of 60-70%, the 10-20% alumina, the 10-15% clay is formed, and principal crystalline phase is the high alumina mullite refractory.This fire proofing composition, though have the compressive strength of higher (60Mpa), the thermal shock resistance extreme difference, 15 times/1100 water-cooleds only, thereby work-ing life is shorter.
Summary of the invention
The objective of the invention is to overcome above-mentioned the deficiencies in the prior art, a kind of cordierite refractory material advantage that both kept is provided, high thermal shock resistance is arranged again, and high intensity, the highly heatproof and shockproof mullite-cordierite refractory composition of long service life.
The object of the invention realizes that main the improvement is with existing high alumina cordierite refractory material, adopts mullite synthesizing to replace natural mullite, suitably increase the trichroite consumption, and, reduce the clay add-on by adding sillimanite, andaluzite, be equipped with the Alpha-alumina super-fine powder, realize the object of the invention.Specifically, highly heatproof and shockproof mullite-cordierite refractory composition of the present invention is characterized in that substantially by the 30-50wt% mullite synthesizing, the 15-25wt% synthesis of dichroite, 10-20wt% sillimanite, 5-10wt% andaluzite, 5-10wt% Alpha-alumina super-fine powder, the 4-6wt% clay is formed.
For reducing cost, fire proofing composition of the present invention can add the 10-15wt% alumina in addition, to reduce the mullite consumption.
The present invention further consists of the 30-40wt% mullite synthesizing, 18-22wt% synthesis of dichroite, 15-20wt% sillimanite, 5-10wt% andaluzite, 5-10wt% Alpha-alumina super-fine powder, 10-15wt% alumina, 4-6wt% clay.
In addition, can also add the silicon powder of trace (for example 1-2%) in the present composition, also favourable promotion refractory materials sintering.
In the fire proofing composition of the present invention:
Suitably reduce the mullite consumption, and add the good sillimanite of a certain amount of high-temperature stability, andaluzite, make the composition refractory materials after 1300 ℃, can produce a certain amount of volumetric expansion, make in the burnt product weave construction and produce micro-flaw.The micro-flaw of this generation helps goods and produce shock absorption when being subjected to the temperature acute variation, thereby improved the thermal shock resistance of fire proofing composition, can improve anti-thermal shock stability about 20-30 time;
Adopt the mullite synthesizing material to replace natural mullite, make that eutectic (for example potassium, sodium) is reduced in the fire proofing composition, also help improving the anti-thermal shock stability of goods, can improve anti-thermal shock stability about 10-20 time, in addition, eutectic reduces, and can also improve about 50 ℃ of fire proofing composition loading softening temperatures;
Suitably increase the trichroite consumption, also help improving anti-thermal shock stability, can improve anti-thermal shock stability about 20-30 time;
Reduce the clay consumption, also help improving goods anti-thermal shock stability, can improve anti-thermal shock stability about 10-20 time, and reduce the clay consumption, can also improve about refractoriness under load 20-30 ℃;
Add the Alpha-alumina super-fine powder, little because of its granularity, purity is high, and is thereby active high, helps promoting to organize the synthetic and sintering of crystalline phase, can remedy because of reducing the deficiency that clay causes the difficulty or ease sintering, needs to improve firing temperature, can reduce about firing temperature 100-150 ℃; And help improving the compressive strength and the mullite crystalline phase of fire proofing composition; And overcome because of the clay minimizing needs to improve firing temperature, can cause burning, and make dissolution of cordierite, reduce the deficiency of thermal shock resistance.
Highly heatproof and shockproof mullite-cordierite refractory composition of the present invention, its material particular diameter grating and burn till and usually the trichroite goods are similar has no special requirements.
Highly heatproof and shockproof mullite-cordierite refractory composition of the present invention, owing to adopt above-mentioned composition, not only kept former cordierite refractory material excellent properties, and greatly improved heat-shock resistance, and cold crushing strength, have excellent comprehensive performances, be used for steel mill's iron-making heat wind furnace, can reach work-ing life of generation furnace life 20-25 through simulation test, prolong work-ing life greatly.Fire proofing composition of the present invention, it is bigger to be specially adapted to temperature variation, thermal shock resistance is had relatively high expectations, and the work atmosphere occasion that has no special requirements is used.Fire proofing composition of the present invention and high aluminum-containing mullite, high alumina trichroite physicochemical property relatively see Table 1.
Fire proofing composition of the present invention, owing to adopt mullite synthesizing, the bigger iron level (less than 0.5%) that reduced, thereby make and burn till refractory product, color and luster is creamy white and (adopts natural mullite, then color and luster becomes pale brown look or beige), similar with pure corundum products, pure alumina, pure electrofused mullite combinations color and lustre, this is a fire proofing composition of the present invention and an obviously difference adopting natural mullite product usually; Secondly, owing to increased the trichroite consumption, make the more common high aluminum-containing mullite of content of magnesia in the goods, high alumina trichroite that increase be arranged in the present composition, greater than 2.0%, can reach 2.0-3.0%, this is a fire proofing composition of the present invention, another distinguishing characteristics.In addition, because of adopting sillimanite, andaluzite, the goods face can also manifest fine small red dot, handles if carry out the pickling deironing, then can further improve the fair and clear degree of products appearance color and luster, and this is the another diagnostic characteristics of fire proofing composition of the present invention.
Below in conjunction with several embodiments, further specify the present invention.
Embodiment
Embodiment: press the embodiment proportioning, take by weighing corresponding material, will give mixedly earlier, add particulate material then and carry out wet mixing less than 180 purpose fine powders, and volt material about 8 hours, put into the mould extrusion forming, burn till through 1380 ℃ * 8h high temperature, make its abundant sintering.
Table 1 the present invention and high aluminum-containing mullite, high alumina trichroite physical and chemical index contrast table
| Physical and chemical index | High aluminum-containing mullite | The high alumina trichroite | The present invention | |
| Chemical Composition | Al 2O 3％ | ≥60 | ≥50 | ≥55 |
| MgO％ | - | ～2.0 | 2.0-3.0 | |
| Fe 2O 3％ | ≤1.5 | ≤1.5 | ≤1.0 | |
| SiO 2％ | ≤35 | ≤35 | ≤35 | |
| Physical behavior | Refractoriness ℃ | ≥1790 | ≥1790 | ≥1790 |
| Volume density g/cm 3 | ≥2.3 | ≥2.1 | ≥2.15 | |
| Apparent porosity % | ≤25 | ≤27 | ≤25 | |
| Cold crushing strength MPa | ≥60 | ≥30 | ≥60 | |
| Thermal shock resistance (1100 ℃ of water-cooleds) is inferior | ～15 | ～30 | ≥100(1200℃) | |
| Appearance luster | Pale brown look | Pale brown look or beige | Oyster white |
Table 2 Example formulations and performance table
| Material is formed | Material | Embodiment 1 | Embodiment 2 | Embodiment 3 | Embodiment 4 |
| Alumina 5-3mm | 5 | 10 | |||
| Alumina 3-1mm | 10 | ||||
| Mullite synthesizing 3-1mm (M70) | 20 | 30 | 35 | 38 | |
| Mullite synthesizing 1-0mm (M70) | 4 | 2 | 2 | 2 | |
| Mullite synthesizing＜240# (M70) | 6 | 6 | 6 | 10 | |
| Trichroite＜1.25mm | 15 | 18 | 25 | 20 | |
| Sillimanite 80-100# | 10 | 4 | 9 | 6 | |
| Sillimanite＜320# | 10 | 6 | 6 | 6 | |
| Andaluzite＜320# | 10 | 7 | 5 | 6 | |
| The αYang Hualv super-fine powder | 5 | 10 | 7 | 6 | |
| Silicon powder | 1 | 1 | 1 | 1 | |
| Suzhou mud 2# | 4 | 6 | 4 | 5 | |
| Physical and chemical index | Al 2O 3％ | 65.7 | 65.9 | 61.8 | 62.7 |
| MgO％ | 2.06 | 2.28 | 2.98 | 2.78 | |
| Fe 2O 3％ | 0.74 | 0.73 | 0.74 | 0.81 | |
| SiO 2％ | 31.1 | 30.6 | 33.9 | 32.5 | |
| Refractoriness ℃ | ≥1790 | ≥1790 | ≥1790 | ≥1790 | |
| Volume density g/m3 | 2.24 | 2.21 | 2.23 | 2.21 | |
| Apparent porosity % | 22.5 | 22.6 | 23.1 | 23.4 | |
| Cold crushing strength Mpa | 68.3 | 69.7 | 65.2 | 62.7 | |
| 1200 ℃ of water-cooleds of thermal shock resistance (inferior) | 112 | 125 | 145 | 132 |
Claims (6)
1, highly heatproof and shockproof mullite-cordierite refractory composition is characterized in that substantially by the 30-50wt% mullite synthesizing 15-25wt% synthesis of dichroite, the 10-20wt% sillimanite, the 5-10wt% andaluzite, 5-10wt% Alpha-alumina super-fine powder, the 4-6wt% clay is formed.
2,, it is characterized in that 10-15wt% alumina in addition according to the described highly heatproof and shockproof mullite-cordierite refractory composition of claim 1.
3, according to the described highly heatproof and shockproof mullite-cordierite refractory composition of claim 2, it is characterized in that consisting of the 30-40wt% mullite synthesizing, the 18-22wt% synthesis of dichroite, the 15-20wt% sillimanite, the 5-10wt% andaluzite, 5-10wt% Alpha-alumina super-fine powder, 10-15wt% alumina, 4-6wt% clay.
4, according to claim 1,2 or 3 described highly heatproof and shockproof mullite-cordierite refractory compositions, it is characterized in that also being added with the 1-2wt% silicon powder.
5,, it is characterized in that MgO content is 2.0-3.0wt% according to claim 1,2 or 3 described highly heatproof and shockproof mullite-cordierite refractory compositions.
6,, it is characterized in that thermal shock resistance 〉=100 time/1200 ℃ of water-cooleds according to claim 1,2 or 3 described highly heatproof and shockproof mullite-cordierite refractory compositions.
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| CNB2006100377944A CN100337978C (en) | 2006-01-16 | 2006-01-16 | Highly heatproof and shockproof mullite-cordierite refractory composition |
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