CN103641501A - Impervious low-aluminum mullite brick for blast furnace and preparation method thereof - Google Patents

Impervious low-aluminum mullite brick for blast furnace and preparation method thereof Download PDF

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Publication number
CN103641501A
CN103641501A CN201310651732.2A CN201310651732A CN103641501A CN 103641501 A CN103641501 A CN 103641501A CN 201310651732 A CN201310651732 A CN 201310651732A CN 103641501 A CN103641501 A CN 103641501A
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parts
granularity
mullite
low
blast furnace
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CN103641501B (en
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蔡国庆
刘伟
李文亮
王文学
王明刚
高蕊
燕宿祥
邵红
刘永振
徐广忠
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Shandong Refractories Group Lunai Kiln Refractory Co Ltd
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Shandong Refractories Group Lunai Kiln Refractory Co Ltd
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Abstract

The invention relates to an impervious low-aluminum mullite brick for a blast furnace. The impervious low-aluminum mullite brick is composed of the following raw materials in parts by weight: 10-15 parts of synthetic mullite having granularity ranging from 5 to 3 mm, 25-30 parts of synthetic mullite having granularity ranging from 3 to 1 mm, 20-30 parts of synthetic mullite having granularity of less than or equal to 1mm, 15-30 parts of andalusite having granularity of 0.074mm, 5-10 parts of clay having granularity of 0.074mm, 3-5 parts of combustion improver and 3-4 parts of binding agent. The impervious low-aluminum mullite brick is low in porosity, low in impurity content, high in strength, good in high-temperature performance, and good in anti-erosion ability; the impervious low-aluminum mullite brick is capable of maintaining the structure stability under high temperature load for a long time on the blast furnace; as a result, the service life of the blast furnace is prolonged.

Description

Impermeabilisation low-aluminum mullite brick and preparation method thereof for blast furnace
Technical field
What the present invention relates to is a kind of blast furnace brick, is specifically related to impermeabilisation low-aluminum mullite brick and preparation method thereof for a kind of blast furnace.
Background technology
Along with the maximization of modern blast furnace, high wind-warm syndrome and high strength are smelted, the working conditions of blast furnace is harshnessization constantly., there is the problems such as void content is high, intensity is low, erosion-resisting characteristics is bad, refractoriness under load is low in bottom hearth of blast furnace refractory materials originally, can not meet the needs of current blast furnace development.Therefore, what the present invention researched and developed is the low-aluminum mullite brick with features such as high strength, high RUL, low pores, significantly improves material resistance to fouling and perviousness, thereby improves the work-ing life of blast furnace.
Summary of the invention
The object of the invention is to solve the problems of the technologies described above, impermeabilisation low-aluminum mullite brick and preparation method thereof for a kind of blast furnace is provided, it has low porosity, low impurity, high strength, high-temperature behavior is good, corrosion resistance is strong, the work-ing life that is conducive to improve blast furnace.
Blast furnace of the present invention impermeabilisation low-aluminum mullite brick, is comprised of the raw material of following parts by weight:
Granularity is mullite synthesizing 10-15 part of 5-3mm, mullite synthesizing 25-30 part that granularity is 3-1mm, and granularity is≤mullite synthesizing 20-30 part of 1mm, granularity is andaluzite 15-30 part of 0.074mm, clay 0.074mm5-10 part, short burning agent 3-5 part, bonding agent 3-4 part.
Granularity is the preferred 20-30 part of the andaluzite of 0.074mm.
Blast furnace impermeabilisation low-aluminum mullite brick, preferably the raw material of following parts by weight is made:
Granularity is mullite synthesizing 10-15 part of 5-3mm, mullite synthesizing 25-30 part that granularity is 3-1mm, and granularity is≤mullite synthesizing 20-30 part of 1mm, granularity is andaluzite 15-30 part of 0.074mm, clay 5-10 part, short burning agent 3-5 part, paper pulp bonding agent 3-4 part.
The mean particle size of clay is 0.074mm.
Blast furnace impermeabilisation low-aluminum mullite brick, preparation process is as follows:
First to add granularity be the mullite synthesizing of 5-3mm, mullite synthesizing that granularity is 3-1mm and granularity is dry mixed 2-4min for the mullite synthesizing particulate material of≤1mm, add again paper pulp bonding agent to mix 2-4min, finally add andaluzite, clay, the short mixed 4-6min of agent that burns, total mixing time goes out to grind after being not less than 10min, after moulding, be dried to dry body residual water-content≤1.0%, finally at 1430-1480 ℃ of temperature lower calcination, obtain product.
Drying temperature is import 50-70 ℃, outlet 110-130 ℃, and be 2-4 days time of drying.
Calcination time is 6-8h.
Mullite crystal is aluminosilicate unique stable form under high temperature action, and andaluzite is heated to, after 1350 ℃, start to change into the acicular mullite parallel with mother crystal under normal pressure, and theoretical yield is 87.64%.At thermal conversion, become in the process of mullite, can form good mullite network, volumetric expansion 3-4%.This is that a kind of irreversible crystal transforms, once conversion, there is higher fire performance, refractoriness can reach more than 1800 ℃, and resistance to suddenly cold and hot, physical strength is large, and heat shock resistance power is strong, and slag resistance is strong, loading point of inversion is high, and there is high chemical stability, be not even dissolved in hydrofluoric acid, extremely strong resistance to chemical corrosion.In preparation process of the present invention, the characteristic of andaluzite raw material has improved structural strength and the high temperature resistant property of impermeabilisation low-aluminum mullite brick greatly.The crystallite of the mullite forming under high temperature can filling and is occupied mullite synthesizing aggregate and microscopic voids that andaluzite, well as clay fines form, reduces the void content of goods, improves the intensity of goods.
The present invention uses the short agent of burning, and effectively improves glassy phase viscosity, the degree of consolidation of enhanced granule and liquid phase, thereby the densification that has improved goods.
Raw material physical and chemical index of the present invention:
The chemical composition massfraction of mullite synthesizing is: Al 2o 3>=45%; SiO 2≤ 50%; Fe 2o 3≤ 1.0%;
The chemical composition massfraction of andaluzite is: Al 2o 3>=55%; SiO 2≤ 40%; Fe 2o 3≤ 1.0%;
The chemical composition massfraction of clay is: Al 2o 3>=25%; SiO 2≤ 50%; Fe 2o 3≤ 2.0%;
The short chemical composition massfraction that burns agent is: Al 2o 3>=14%; SiO 270~75%; Fe 2o 3≤ 1.0%; R 2o≤12%.
Mullite synthesizing, andaluzite, clay, the agent of short burning are commercially available prod.
Impermeabilisation low-aluminum mullite brick Al for blast furnace of the present invention 2o 3content is more than 45%, Fe 2o 3content≤1.1%; It is more than 1500 ℃ that loading softening starts temperature; Void content≤12%; Volume density is greater than 2.35g/cm 3; Compressive strength is greater than 60MPa; Line velocity of variation (1450 ℃ of * 3h) ± 0.1%, well for positions such as Blast Furnace Bottom and cupola wells.
The present invention compared with prior art, has following beneficial effect:
The present invention has that low porosity, low impurity, high strength, high-temperature behavior are good, and intensity is high, and corrosion resistance is strong, on blast furnace, can under high-temperature load, keep Stability Analysis of Structures for a long time, has improved the work-ing life of blast furnace.
Accompanying drawing explanation
Fig. 1 is that embodiment 2 is at the erosion figure of 1450 ℃ * 3h;
Fig. 2 is that embodiment 2 is at the erosion figure of 1550 ℃ * 3h.
Embodiment
Below in conjunction with embodiment, the present invention is described further.
Embodiment 1
Composition of raw materials:
Granularity is 23 parts of the mullite synthesizings of 15 parts of the mullite synthesizings of 5-3mm, 25 parts of mullite synthesizings that granularity is 3-1mm, granularity≤1mm; Granularity is 25 parts of the andaluzites of 0.074mm; Granularity is 8 parts of the clays of 0.074mm, short 4 parts of agent, 3.5 parts of the paper pulp of burning.
The preparation method of impermeabilisation low-aluminum mullite brick for blast furnace:
(1) mix: use Φ 2400 edge runner-wet mills, first to add granularity be 15 parts of the mullite synthesizings of 5-3mm, 25 parts of mullite synthesizings that granularity is 3-1mm and granularity is dry mixed 2min for 23 parts of particulate material of mullite synthesizing of≤1mm, add 3.5 parts of paper pulp bonding agents to mix 3min, finally adding granularity is 25 parts of the andaluzites of 0.074mm, 8 parts of the clays that granularity is 0.074mm, the short 4 parts of mixed 6min of agent that burn, always mix and go out to grind after time 11min, put into moulding feed bin;
(2) moulding: in the moulding of 500T automatic pressing brick locomotive platform;
(3) dry: enter tunnel chamber for drying dry 4 days, guarantee dry body residual water-content≤1.0%, drying temperature is 50 ℃ of imports, exports 110 ℃;
(4) entrucking and burning till: in tunnel furnace after 1440 ± 5 ℃ of insulations are burnt till 7 hours kiln discharge, obtain product.
Embodiment 2
Composition of raw materials:
Granularity is 30 parts of the mullite synthesizings of 10 parts of the mullite synthesizings of 5-3mm, 30 parts of mullite synthesizings that granularity is 3-1mm, granularity≤1mm; Granularity is 20 parts of the andaluzites of 0.074mm; Granularity is 5 parts of the clays of 0.074mm, short 5 parts of agent, 4 parts of the paper pulp bonding agents of burning.
The preparation method of impermeabilisation low-aluminum mullite brick for blast furnace:
(1) mix: use Φ 2400 edge runner-wet mills, granularity is that 30 parts of the mullite synthesizings of 10 parts of the mullite synthesizings of 5-3mm, 30 parts of mullite synthesizings that granularity is 3-1mm, granularity≤1mm are dry mixed 4min, add 4 parts of paper pulp bonding agents to mix 3min, finally add 5 parts of the clays that 20 parts of 0.074mm andaluzites, granularity are 0.074mm, the short 5 parts of mixed 5min of agent that burn, always mix and go out to grind after time 12min, put into moulding feed bin;
(2) moulding: in the moulding of 500T automatic pressing brick locomotive platform;
(3) dry: enter tunnel chamber for drying dry 3 days, guarantee dry body residual water-content≤1.0%, drying temperature is 60 ℃ of imports, exports 115 ℃.
(4) entrucking and burning till: in tunnel furnace after 1435 ± 5 ℃ of insulations are burnt till 8 hours kiln discharge, obtain product.
Embodiment 3
Composition of raw materials:
Granularity is 30 parts of the mullite synthesizings of 10 parts of the mullite synthesizings of 5-3mm, 27 parts of mullite synthesizings that granularity is 3-1mm, granularity≤1mm; Granularity is 30 parts of the andaluzites of 0.074mm; Granularity is 10 parts of the clays of 0.074mm, short 3 parts of agent, 3 parts of the paper pulp of burning.
The preparation method of impermeabilisation low-aluminum mullite brick for blast furnace:
(1) mix: use Φ 2400 edge runner-wet mills, first to add granularity be 10 parts of the mullite synthesizings of 5-3mm, 27 parts of mullite synthesizings that granularity is 3-1mm and granularity is dry mixed 2min for 30 parts of particulate material of mullite synthesizing of≤1mm, add 3 parts of paper pulp bonding agents to mix 4min, finally adding granularity is 30 parts of the andaluzites of 0.074mm, 10 parts of the clays that granularity is 0.074mm, the short 3 parts of mixed 6min of agent that burn, always mix and go out to grind after time 12min, put into moulding feed bin;
(2) moulding: in the moulding of 500T automatic pressing brick locomotive platform;
(3) dry: enter tunnel chamber for drying dry 2 days, guarantee dry body residual water-content≤1.0%, drying temperature is 70 ℃ of imports, exports 130 ℃.
(4) entrucking and burning till: in tunnel furnace after 1475 ± 5 ℃ of insulations are burnt till 6 hours kiln discharge, obtain product.
A) to the product detected result of embodiment 1-3 in Table 1.
The detected result of table 1 embodiment 1-3
Physicochemical property Requirement Embodiment 1 Embodiment 2 Embodiment 3
Al 2O 3/% ≥45 48.13 48.52 48.11
Fe 2O 3/% ≤1.1 0.95 0.91 0.90
Apparent porosity/% ≤12 11.0 10.8 12
Volume density/g/cm 3 ≥2.35 2.42 2.43 2.39
Cold crushing strength/MPa ≥60 80.6 86 80
Reheat linear change/(1450 ℃ * 3h) % ±0.1 0 0 0
Refractoriness under load T0.6/ ℃ ≥1500 1520 1535 1513
B) the anti-erosion test situation of anti-erosion conclusion (of pressure testing): embodiment 2 is as table 2:
The static erosion test contrast of table 2

Claims (6)

1. a blast furnace impermeabilisation low-aluminum mullite brick, is characterized in that, by the raw material of following parts by weight, is made:
Granularity is mullite synthesizing 10-15 part of 5-3mm, mullite synthesizing 25-30 part that granularity is 3-1mm, and granularity is≤mullite synthesizing 20-30 part of 1mm, granularity is andaluzite 15-30 part of 0.074mm, clay 5-10 part, short burning agent 3-5 part, paper pulp bonding agent 3-4 part.
2. blast furnace according to claim 1 impermeabilisation low-aluminum mullite brick, is characterized in that, preferably by the raw material of following parts by weight, is made:
Granularity is 15 parts of the mullite synthesizings of 5-3mm, 25 parts of the mullite synthesizings that granularity is 3-1mm, and granularity is≤23 parts of the mullite synthesizings of 1mm, 25 parts of the andaluzites that granularity is 0.074mm, 8 parts of clays, short 4 parts of agent, 3.5 parts of the paper pulp bonding agents of burning.
3. blast furnace according to claim 1 and 2 impermeabilisation low-aluminum mullite brick, is characterized in that, the mean particle size of clay is 0.074mm.
4. a preparation method for impermeabilisation low-aluminum mullite brick for blast furnace claimed in claim 1, is characterized in that, preparation process is as follows:
First to add granularity be the mullite synthesizing of 5-3mm, mullite synthesizing that granularity is 3-1mm and granularity is dry mixed 2-4min for the mullite synthesizing particulate material of≤1mm, add again paper pulp bonding agent to mix 2-4min, finally add andaluzite, clay, the short mixed 4-6min of agent that burns, total mixing time goes out to grind after being not less than 10min, after moulding, be dried to dry body residual water-content≤1.0%, finally at 1430-1480 ℃ of temperature lower calcination, obtain product.
5. the preparation method of impermeabilisation low-aluminum mullite brick for blast furnace according to claim 4, is characterized in that, drying temperature is import 50-70 ℃, outlet 110-130 ℃, and be 2-4 days time of drying.
6. the preparation method of impermeabilisation low-aluminum mullite brick for blast furnace according to claim 4, is characterized in that, calcination time is 6-8h.
CN201310651732.2A 2013-12-05 2013-12-05 Impervious low-aluminum mullite brick for blast furnace and preparation method thereof Active CN103641501B (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105294128A (en) * 2015-11-19 2016-02-03 长兴县新宏信耐火材料有限公司 Andalusite-mullite composite material brick
CN108752984A (en) * 2018-05-03 2018-11-06 杨诚龙 Surface abrasion resistance antioxidant coating, preparation method and applications
CN108753316A (en) * 2018-05-18 2018-11-06 武汉钢铁有限公司 A kind of compound masonry construction of coke oven regenerator checker brick
CN108794031A (en) * 2018-08-29 2018-11-13 通达耐火技术股份有限公司 A kind of cement kiln low-aluminum mullite brick and preparation method thereof

Citations (1)

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Publication number Priority date Publication date Assignee Title
CN102161590A (en) * 2010-02-24 2011-08-24 山东鲁耐窑业有限责任公司 Mullite-andalusite product for key position of dry quenching device and preparation method thereof

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Publication number Priority date Publication date Assignee Title
CN102161590A (en) * 2010-02-24 2011-08-24 山东鲁耐窑业有限责任公司 Mullite-andalusite product for key position of dry quenching device and preparation method thereof

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Title
毕玉保等: "多种外加剂对红柱石制品烧结性能影响的研究", 《现代技术陶瓷》, no. 1, 31 December 2006 (2006-12-31) *

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105294128A (en) * 2015-11-19 2016-02-03 长兴县新宏信耐火材料有限公司 Andalusite-mullite composite material brick
CN108752984A (en) * 2018-05-03 2018-11-06 杨诚龙 Surface abrasion resistance antioxidant coating, preparation method and applications
CN108753316A (en) * 2018-05-18 2018-11-06 武汉钢铁有限公司 A kind of compound masonry construction of coke oven regenerator checker brick
CN108753316B (en) * 2018-05-18 2021-03-02 武汉钢铁有限公司 Composite masonry structure of checker bricks of coke oven regenerator
CN108794031A (en) * 2018-08-29 2018-11-13 通达耐火技术股份有限公司 A kind of cement kiln low-aluminum mullite brick and preparation method thereof

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