CN104961485A - Magnesium spinel refractory material high in thermal shock resistance and manufacturing method thereof - Google Patents
Magnesium spinel refractory material high in thermal shock resistance and manufacturing method thereof Download PDFInfo
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Abstract
The invention relates to a magnesium spinel refractory material high in thermal shock resistance. According to the physical and chemical indicators of the magnesium spinel refractory material high in thermal shock resistance, MgO>=83%, Al2O3=12%-14%, Fe2O3<=1.0%, and SiO2<=1.2%; the volume density is 2.90-3.00g/cm<3>, the apparent porosity is smaller than or equal to 18%, the cold compressive strength is equal to or higher than 60MPa, the refractoriness under loads is equal to or higher than 1700 DEG C, and the thermal shock stability is equal to or higher than 16 times. The magnesium spinel refractory material high in thermal shock resistance is composed of, by weight, 20-30 parts of high-purity magnesia with the particle size being equal to or larger than 2mm and smaller than 4 mm, 8-12 parts of high-purity magnesia with the particle size being equal to or larger than 1 mm and smaller than 2 mm, 11-15 parts of high-purity magnesia with the particle size being equal to or larger than 0 mm and smaller than 1 mm, 17-21 parts of 200-mesh high-purity magnesia, 6-9 parts of fused magnesia with the particle size being equal to or larger than 0 mm and smaller than 1 mm, 6-9 parts of 200-mesh fused magnesia, 3-7 parts of fused magnesium aluminate spinel with the particle size being equal to or larger than 2 mm and smaller than 4 mm, 3-7 parts of fused magnesium aluminate spinel with the particle size being equal to or larger than 1 mm and smaller than 2 mm, 3-7 parts of fused magnesium aluminate spinel with the particle size being equal to or larger than 0 mm and smaller than 1 mm, 2-5 parts of 200-mesh alpha-Al2O3 powder and 2-5 parts of binding agent. The service life of the refractory material made of the composite materials reaches the expected service life which is over five years when the refractory material is used on lime kilns, and the service life reaches 1000 times when the refractory material is used for grooves in the middle and upper portion of an HR furnace.
Description
Technical field
The present invention relates to fire resisting material field, particularly a kind of highly heatproof and shockproof magnesia spinel refractory materials and preparation method thereof.
Background technology
Magnesia spinel refractory materials is ceramic, alkaline refractory product, has that refractoriness is high, wear resistance good, and alkali resistant aggressiveness ability is strong, and especially have good thermal shock resistance, the life-span can reach about 5 years.
Regrettably, can make highly heatproof and shockproof magnesia spinel refractory materials (heat-shock resistance (
) more than 16 times) and factory almost only have Austrian Ao Mei company.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of highly heatproof and shockproof magnesia spinel refractory materials and preparation method thereof, the work-ing life of refractory product on stove is brightly significantly improved, improves the competitive capacity of enterprise.
For achieving the above object, the present invention realizes by the following technical solutions:
A kind of highly heatproof and shockproof magnesia spinel refractory materials, its physical and chemical index is MgO>=83%, Al
2o
3: 12-14%, Fe
2o
3≤ 1.0%, SiO
2≤ 1.2%, volume density: 2.90-3.00g/cm
3, apparent porosity≤18%, cold crushing strength>=60MPa, refractoriness under load>=1700 DEG C, thermal shock resistance>=16 time, formed by weight ratio by following raw material: the highly-purity magnesite of 2≤granularity < 4mm 20 ~ 30 parts, the highly-purity magnesite of 1≤granularity < 2mm 8 ~ 12 parts, the highly-purity magnesite of 0≤granularity < 1mm 11 ~ 15 parts, 200 object highly-purity magnesites 17 ~ 21 parts, the electrosmelted magnesite clinker of 0≤granularity < 1mm 6 ~ 9 parts, 200 object electrosmelted magnesite clinkers 6 ~ 9 parts, the electric melting magnesium aluminum spinel of 2≤granularity < 4m 3 ~ 7 parts, the electric melting magnesium aluminum spinel of 1≤granularity < 2mm 3 ~ 7 parts, the electric melting magnesium aluminum spinel of 0≤granularity < 1mm 3 ~ 7 parts, 200 object α-Al
2o
32 ~ 5 parts, powder, bonding agent 2 ~ 5 parts.
MgO+Al in described magnesium-aluminium spinel
2o
3>=98%, SiO
2≤ 0.6%.
Described bonding agent is paper pulp.
An its preparation method for highly heatproof and shockproof magnesia spinel refractory materials, completes according to the following steps:
1) raw material pulverizing screening fine grinding: highly-purity magnesite is broken in crusher, make 2≤granularity < 4mm respectively, 1≤granularity < 2mm, 0≤granularity < 1mm, the raw material of 200 objects, four kinds of particle diameters, electrosmelted magnesite clinker is broken in crusher, make 0≤granularity < 1mm respectively, the raw material of 200 objects, two kinds of particle diameters, electric melting magnesium aluminum spinel is broken in crusher, make 2≤granularity < 4m respectively, 1≤granularity < 2mm, the raw material of three kinds of particle diameters of 0≤granularity < 1mm,
2) proportioning: take raw material by above-mentioned formula;
3) mix: first by 200 order α-Al
2o
3the electrosmelted magnesite clinker premix of micro mist and 0≤granularity < 1mm, adopt planetary sand mill, then bonding agent paper pulp is added, add 2≤granularity < 4mm, 1≤granularity < 2mm, 200 order highly-purity magnesites more successively, 200 order electrosmelted magnesite clinkers, 2≤granularity < 4m, 1≤granularity < 2mm, 0≤granularity < 1mm electric melting magnesium aluminum spinel, only do time and be not less than 12min, then discharging;
4) shaping: shaping employing 630t press, cloth is even, tip-tap 3 ~ 5 times;
5) goods burn till: stack bricks after dry kiln 100 ~ 120 DEG C of drying 12 ~ 14h, enter 110m hyperthermia tunnel Kiln to burn till, go-cart system: 110 ~ 120min/ car, zero-pressure position controls position, 1 ~ 2 parking stall before first pair of burner, maximum sintering temperature 1740 DEG C, soaking time is not less than 6h, adopts 60 ~ 70 DEG C/h cooling rate;
6) kiln discharge selection: choose after product kiln discharge;
7) Product checking: the apparent porosity of magnesia-spinel brick of producing and volume density, refractoriness under load, cold crushing strength and heat-shock resistance are detected;
8) check and accept and pack: examination and packaging perform by national standard.
Compared with prior art, the invention has the beneficial effects as follows:
Refractory product made by matrix material of the present invention reaches the expected service life of more than 5 years on limestone kiln; In RH stove, upper slot reaches more than 1000 times.
Due to α-Al
2o
3micro mist has the advantages that surface imperfection is many, energy state is high, activity is easy to greatly sintering, is conducive to the formation of spinel.Utilize the difference of linear expansivity between magnesia spinel and magnesia to adjust refractory materials thermal shock resistance, complex phase modification, play the superperformance of matrix material.To the state of the art improving China refractory materials, promote industry competition ability, and the Economic development of this area also has and important affects meaning.
Embodiment
Below the specific embodiment of the present invention is further illustrated:
In following embodiment, method therefor is ordinary method if no special instructions.
A kind of highly heatproof and shockproof magnesia spinel refractory materials, its raw material packet is containing 2-4mm (refer to be more than or equal to 2mm and be less than 4mm) highly-purity magnesite 20 ~ 30 parts, 1-2mm (refer to be more than or equal to 1mm and be less than 2mm) highly-purity magnesite 8 ~ 12 parts, 0-1mm (refer to be more than or equal to 0mm and be less than 1mm) highly-purity magnesite 11 ~ 15 parts, 200 orders (being less than 0.074mm) highly-purity magnesite 17 ~ 21 parts, 1-0mm electrosmelted magnesite clinker 6 ~ 9 parts, 200 order electrosmelted magnesite clinkers 6 ~ 9 parts, 2-4mm electric melting magnesium aluminum spinel 3 ~ 7 parts, 1-2mm electric melting magnesium aluminum spinel 3 ~ 7 parts, 0-1mm electric melting magnesium aluminum spinel 3 ~ 7 parts, 200 order α-Al
2o
32 ~ 5 parts, powder, bonding agent 2 ~ 5 parts.
Above-mentioned matrix material raw material choose: magnesia spinel refractory materials is produced raw materials used: 97.5 highly-purity magnesites, 97 electrosmelted magnesite clinkers, electric melting magnesium aluminum spinel, α-Al
2o
3, feedstock specifications is in table 2.
Table 2 main raw material index
Provide embodiment 1-3 highly heatproof and shockproof magnesia spinel refractory materials and preparation method below.The formula of embodiment 1-3 highly heatproof and shockproof magnesia spinel refractory materials is in table 2.
Table 3: the formula of embodiment 1-3 highly heatproof and shockproof magnesia spinel refractory materials
| Batching | Embodiment 1 | Embodiment 2 | Embodiment 3 |
| 2-4mm highly-purity magnesite | 25 | 20 | 27 |
| 1-2mm highly-purity magnesite | 10 | 11 | 8 |
| 0-1mm highly-purity magnesite | 13 | 11 | 12 |
| 200 order highly-purity magnesites | 19 | 17 | 18 |
| 0-1mm 97 electrosmelted magnesite clinker | 7.5 | 9 | 8 |
| 200 order 97 electrosmelted magnesite clinkers | 7.5 | 8 | 9 |
| 2-4mm electric smelting spinel | 5 | 6 | 6 |
| 1-2mm electric smelting spinel | 5 | 6 | 5 |
| 0-1mm electric smelting spinel | 5 | 7 | 5 |
| 200 order α-Al 2O 3 | 3 | 5 | 4 |
| Bonding agent | 3 | 3.5 | 4 |
The preparation method of the highly heatproof and shockproof magnesia spinel refractory materials of embodiment 1-3, comprises the following steps:
1) raw material pulverizing screening fine grinding: highly-purity magnesite is broken in crusher, makes the raw material of 0-1mm, 1-2mm, 2-4mm and 200 objects, four kinds of particle diameters respectively.Electrosmelted magnesite clinker is broken in crusher, make the raw material of 0-1mm and 200 objects, two kinds of particle diameters respectively.Electric melting magnesium aluminum spinel is broken in crusher, make the raw material of 0-1mm, 1-2mm, 2-4mm tri-kinds of particle diameters respectively.
2) proportioning: take raw material by above-mentioned formula.
3) mix: first get 200 object α-Al
2o
3micro mist and 1-0mm electrosmelted magnesite clinker 1-0mm premix; Adopt planetary sand mill, then add bonding agent paper pulp, then add 0-1mm, 1-2mm, 2-4mm and 200 order highly-purity magnesites successively, 200 object electrosmelted magnesite clinkers, the electric melting magnesium aluminum spinel of 0-1mm, 1-2mm, 2-4mm, only does time and is not less than 12min, then discharging.
4) shaping: shaping employing 630t press, cloth is even, tip-tap 3 ~ 5 times;
5) goods burn till: stack bricks after dry kiln 100 ~ 120 DEG C of drying 12 ~ 14h, enter 110m hyperthermia tunnel Kiln to burn till, go-cart system: 110 ~ 120min/ car, zero-pressure position controls position, 1 ~ 2 parking stall before first pair of burner, maximum sintering temperature 1740 DEG C, soaking time is not less than 6h, adopts 60 ~ 70 DEG C/h cooling rate;
6) kiln discharge selection: after product kiln discharge, selection, selection performs mark in table 4:
The size deviation of table 4 product and visual appearance
7) Product checking: according to GB/T 2997-2000, GB/T 5989-2008, GB/T 5072-2008, YB/T376.1-1995, the apparent porosity of the magnesia-spinel brick produced and volume density, refractoriness under load, cold crushing strength and heat-shock resistance are detected respectively;
8) check and accept and pack
1 checks and accepts:
1.1 weight often criticizing brick must not more than 100t.
Sampling, the examination of 1.2 bricks are undertaken by YB 367-75 " refractory product sampling, examination, keeping and transport are regular ".
2 packagings, transport, storage and quality certificate:
The packaging of 2.1 bricks, transport and storage are undertaken by YB 367-75 " refractory product sampling, check and accept, keeping and transport rule ".
The quality certificate must signed and issued with technical supervision department when 2.2 bricks dispatch from the factory, to indicate for party name or emblem mark, demanding party's title, Shipping Date, contract number, standard number, name of product, the trade mark, brick number, lot number, size, outward appearance, section and physical and chemical index.
9) physical and chemical index: the physical and chemical index of highly heatproof and shockproof magnesia spinel refractory materials embodiment is in table 5:
The physical and chemical index of table 5 highly heatproof and shockproof magnesia spinel refractory materials embodiment
| Project | Embodiment 1 | Embodiment 2 | Embodiment 3 |
| w(MgO)/％ | ≥83 | ≥89 | ≥85 |
| w(Al 2O 3)/％ | 12 | 14 | 13 |
| w(Fe 2O 3)/％ | ≤1.0 | ≤0.96 | ≤0.91 |
| w(SiO 2)/％ | ≤1.2 | ≤1.0 | ≤1.1 |
| Volume density/g/cm 3 | 3.00 | 2.90 | 2.98 |
| Apparent porosity/% | ≤18 | ≤16 | ≤17 |
| Cold crushing strength/MPa | ≥60 | ≥68 | ≥65 |
| Refractoriness under load, T0.6 (DEG C) 0.2MPa | ≥1700 | ≥1750 | ≥1800 |
| Thermal shock resistance (1100 DEG C water-cooled, secondary) | ≥16 | ≥20 | ≥18 |
Be only ultimate principle of the present invention above, not impose any restrictions the present invention, the present invention of every foundation carries out equivalent variations and modification to it, all within the category of the art of this patent protection scheme.
Claims (4)
1. a highly heatproof and shockproof magnesia spinel refractory materials, is characterized in that, its physical and chemical index is MgO>=83%, Al
2o
3: 12-14%, Fe
2o
3≤ 1.0%, SiO
2≤ 1.2%, volume density: 2.90-3.00g/cm
3, apparent porosity≤18%, cold crushing strength>=60MPa, refractoriness under load>=1700 DEG C, thermal shock resistance>=16 time, formed by weight ratio by following raw material: the highly-purity magnesite of 2≤granularity < 4mm 20 ~ 30 parts, the highly-purity magnesite of 1≤granularity < 2mm 8 ~ 12 parts, the highly-purity magnesite of 0≤granularity < 1mm 11 ~ 15 parts, 200 object highly-purity magnesites 17 ~ 21 parts, the electrosmelted magnesite clinker of 0≤granularity < 1mm 6 ~ 9 parts, 200 object electrosmelted magnesite clinkers 6 ~ 9 parts, the electric melting magnesium aluminum spinel of 2≤granularity < 4m 3 ~ 7 parts, the electric melting magnesium aluminum spinel of 1≤granularity < 2mm 3 ~ 7 parts, the electric melting magnesium aluminum spinel of 0≤granularity < 1mm 3 ~ 7 parts, 200 object α-Al
2o
32 ~ 5 parts, powder, bonding agent 2 ~ 5 parts.
2. a kind of highly heatproof and shockproof magnesia spinel refractory materials according to claim 1, is characterized in that, MgO+Al in described magnesium-aluminium spinel
2o
3>=98%, SiO
2≤ 0.6%.
3. a kind of highly heatproof and shockproof magnesia spinel refractory materials according to claim 1, it is characterized in that, described bonding agent is paper pulp.
4. an its preparation method for highly heatproof and shockproof magnesia spinel refractory materials, is characterized in that, completes according to the following steps:
1) raw material pulverizing screening fine grinding: highly-purity magnesite is broken in crusher, make 2≤granularity < 4mm respectively, 1≤granularity < 2mm, 0≤granularity < 1mm, the raw material of 200 objects, four kinds of particle diameters, electrosmelted magnesite clinker is broken in crusher, make 0≤granularity < 1mm respectively, the raw material of 200 objects, two kinds of particle diameters, electric melting magnesium aluminum spinel is broken in crusher, make 2≤granularity < 4m respectively, 1≤granularity < 2mm, the raw material of three kinds of particle diameters of 0≤granularity < 1mm,
2) proportioning: take raw material by above-mentioned formula;
3) mix: first by 200 order α-Al
2o
3the electrosmelted magnesite clinker premix of micro mist and 0≤granularity < 1mm, adopt planetary sand mill, then bonding agent paper pulp is added, add 2≤granularity < 4mm, 1≤granularity < 2mm, 200 order highly-purity magnesites more successively, 200 order electrosmelted magnesite clinkers, 2≤granularity < 4m, 1≤granularity < 2mm, 0≤granularity < 1mm electric melting magnesium aluminum spinel, only do time and be not less than 12min, then discharging;
4) shaping: shaping employing 630t press, cloth is even, tip-tap 3 ~ 5 times;
5) goods burn till: stack bricks after dry kiln 100 ~ 120 DEG C of drying 12 ~ 14h, enter 110m hyperthermia tunnel Kiln to burn till, go-cart system: 110 ~ 120min/ car, zero-pressure position controls position, 1 ~ 2 parking stall before first pair of burner, maximum sintering temperature 1740 DEG C, soaking time is not less than 6h, adopts 60 ~ 70 DEG C/h cooling rate;
6) kiln discharge selection: choose after product kiln discharge;
7) Product checking: the apparent porosity of magnesia-spinel brick of producing and volume density, refractoriness under load, cold crushing strength and heat-shock resistance are detected;
8) check and accept and pack: examination and packaging perform by national standard.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105777151A (en) * | 2016-02-23 | 2016-07-20 | 鞍山市奥鞍耐火材料有限责任公司 | Magnesium aluminate spinel refractory material containing manganese and preparing method thereof |
| CN105837229A (en) * | 2016-03-19 | 2016-08-10 | 江苏诺明高温材料股份有限公司 | Preparation method of magnesium aluminate spinel brick |
| CN112456974A (en) * | 2020-12-09 | 2021-03-09 | 北京金隅通达耐火技术有限公司 | Magnalium spinel brick for co-processing cement kiln and preparation method and application thereof |
| CN112456999A (en) * | 2020-12-01 | 2021-03-09 | 中冶焦耐(大连)工程技术有限公司 | Brick for rotary kiln burning zone and preparation method thereof |
| CN117430439A (en) * | 2023-12-20 | 2024-01-23 | 中钢洛耐科技股份有限公司 | Composite refractory material for melting furnace top and upper part and preparation method and application thereof |
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| CN103588492A (en) * | 2013-11-11 | 2014-02-19 | 海城市中兴高档镁质砖有限公司 | High-quality carbon-free aluminum-magnesium spinel brick used for refined steel ladle lining and preparation method thereof |
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| CN101462883A (en) * | 2008-12-31 | 2009-06-24 | 海城市中兴高档镁质砖有限公司 | Low-intensity magnesium brick and production method thereof |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105777151A (en) * | 2016-02-23 | 2016-07-20 | 鞍山市奥鞍耐火材料有限责任公司 | Magnesium aluminate spinel refractory material containing manganese and preparing method thereof |
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| CN105837229A (en) * | 2016-03-19 | 2016-08-10 | 江苏诺明高温材料股份有限公司 | Preparation method of magnesium aluminate spinel brick |
| CN112456999A (en) * | 2020-12-01 | 2021-03-09 | 中冶焦耐(大连)工程技术有限公司 | Brick for rotary kiln burning zone and preparation method thereof |
| CN112456974A (en) * | 2020-12-09 | 2021-03-09 | 北京金隅通达耐火技术有限公司 | Magnalium spinel brick for co-processing cement kiln and preparation method and application thereof |
| CN117430439A (en) * | 2023-12-20 | 2024-01-23 | 中钢洛耐科技股份有限公司 | Composite refractory material for melting furnace top and upper part and preparation method and application thereof |
| CN117430439B (en) * | 2023-12-20 | 2024-03-12 | 中钢洛耐科技股份有限公司 | Composite refractory material for melting furnace top and upper part and preparation method and application thereof |
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Address after: 114206 Liaoning City, Anshan Province, Haicheng City, the town of Wang Village, the village of eight Patentee after: Haicheng Lear MEG Materials Co. Ltd. Sita Address before: 114206 Liaoning City, Anshan Province, Haicheng City, the town of Wang Village, the village of eight Patentee before: Haicheng Zhongxing High-Grade Magnesia Brick Co., Ltd. |