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Category Archives: Corundum Mullite Bricks Series

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Jun 30, 2021
Corundum Mullite Bricks

The characteristics of Corundum Mullite Bricks:

1. Low bulk density, low thermal conductivity, good thermal insulation performance.
2. Refractory category allow direct contact of fire, suitable ofr various atmosphere
3. Good integrity with furnace lining, long service life, easy operation, could be shaped freely
4. Product specification: standard form, normal standard, shaped and special shaped bricks.
5. Can be used in various kilns because of its cheapness and general tray package. Among all of the refractory materials, it is the most widely used.

Technical Data of Corundum Mullite Bricks

Performance and application              Corundum-mullite brick
Al2O3 %           80                                     ≥86
Bulk density g/cm3 ≥2.75 ≥2.90
Cold Crushing Strength Mpa ≥60 ≥80
Refractoriness under load °C ≥1700 ≥1700
Liner Change on Reheating% ±0.2(1600°C*2h) ±0.2(1600°C*2h)
Thermal shock stability  (water-cooling)frequency 1100 °C ≥20 ≥20
Coefficient of thermal expansion

*10-6/°C

 4.8-7.6 5.0-8.0
Max application temperature °C 1700
Application Used for the inner liner of the high-temperature kiln, the shed bar of kiln car, etc. Used for the inner liner of the high-temperature kiln, pusher plate of electronic magnetic material

The Application of Corundum Mullite Bricks:

1.Metallurgy industry
2.Heat treatment furnace
3.Chemical industry
4.Steel, non-ferrous smelting furnace
5.Boiler and waste incinerator
6.Coke oven
7.Blast furnace

Zhengzhou Rongsheng Kiln Refractory Co. Ltd. has more than 20 years of history in the production of refractory materials. Our company is mainly engaged in the production of shaped refractories, unshaped refractories, thermal insulation materials. Now, we have established cooperative relationships with many R&D units, and our products have been sold to Japan, Korea, New Zealand, Indonesia, South Africa, Pakistan, Nigeria, Kazakhstan, etc.

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Jun 30, 2021
Fused Mullite Bricks

Fused Cast Mullite Bricks Properties

Excellent thermal shock resistance can resist drastic temperature change.
Excellent abrasion resistance is suitable for high-temperature wearing parts.
Excellent permeation and chemical corrosion resistance.
Low thermal expansion rate, masonry has good structural stability.
High hot mechanical strength, can support a large load.

Fused Cast Mullite Bricks Physiochemical Indexes

Item RZMZ-1 RZMZ-2 RZMZ-3 RZMZ-4
Al2O3 % 70~75 76.17 73.5~76 73.1
SiO2 % 18~21 19.33 22~26 19
Fe2O3 % 2.5~4 1.8 0.1 0.6
TiO2 % 3.0~4.5 2.91 0.05 0.30
Refractoriness ℃ 1790 1790 1790 1790
Bulk density g/cm3 3.00~3.20 3.20 3.20 3.20
Apparent porosity % 1~3 0.5~1.0 / /
Crushing strength MPa >300 176~317 >176 ≥123

Fused Cast Mullite Bricks Application

Fused cast mullite bricks are mainly used at high-temperature parts of smelting furnaces, where suffer severe abrasion and chemical corrosion, such as sliding rail bricks of metallurgical Pusher-type heating furnace, walking-type heating furnace tapping platform (tapping spout) and garbage incinerator lining, etc.

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Jun 30, 2021
Fused Corundum Bricks

Fused Corundum Brick Classification

Fused Corundum Refractory Brick includes two types of Sintered Corundum Brick and Fused Cast Corundum Brick. Sintered Corundum Brick adopts sintered alumina as the raw material through the sintering process. Fused Cast AZS Brick can be made of fused alumina as the raw refractory material through the process method of sintering And also can use phosphoric acid or other adhesive to make Unburnt Corundum Fire Brick.

Corundum Brick Manufacturing Process

Refractory Fused Corundum Bricks include Fused Cast Corundum Brick, Fused Alumina Corundum Brick, and Sintered Corundum Brick. Fused Cast Corundum Brick is manufactured with commercial alumina and little sodium carbonate and quartz powder fusing in the quartz powder and through the process of casting and annealing, and then form the shape and size through machining. Fused Alumina Corundum Brick is made of fused alumina particle and fines adding little fire clay and binding agent through molding by fire brick machine after mulling. The density of fire brick is about 2.75~2.85g/cm3. After drying the refractory bricks are fired at a temperature of 1700~1800℃.

Fused Corundum Bricks Specifications

Item Fused Cast Alumina Fused Cast Alumina Fused Cast Alumina
a-b Alumina RS-M a-Alumina RS-A b-Alumina  RS-H
Chemical Composition Al2O3 94 98.5 93
SiO2 1 0.4 –
NaO2 4 0.9 6.5
Other oxides 1 0.2 0.5
Crystallograghic
Analysis %		 a-Al2O3 44 90 –
Vitreous 55 4 99
Vitreous Phase 1 6 1

Application of Fused Corundum Brick

1.Blast Furnace
2.Hot Blast Stove
3.Refining Furnace
4.Glass Furnace
5.Petrochemical Industrial Furnaces
6.All kinds of high-temperature kiln lining in the metallurgical industry

 

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Jun 30, 2021
Chrome Corundum Bricks

Chrome Corundum Bricks Physiochemical Index

Item GGZ-60 GGZ-30 GGZ-12
Cr2O3 % ≥60 ≥30 ≥12
Al2O3 % ≤38 ≤68 ≤80
Fe2O3 % ≤0.2 ≤0.2 ≤0.5
Apparent porosity % ≤14 ≤16 ≤18
Bulk density g/cm3 ≥3.63 ≥3.53 ≥3.3
Cold Crushing Strength Mpa ≥130 ≥130 ≥120
Refractoriness under load (0.2MPa,0.6%) ℃ ≥1700 ≥1700 ≥1700
Reheating linear change rate(1600℃×3h) % ±0.2 ±0.2 ±0.2

RS company produces various grades of Cr2O3 corundum bricks, which can different application requirements. By production carts, chrome corundum bricks are classified into fused chrome corundum bricks and fired chrome corundum bricks. By Cr2O3 content, chrome corundum bricks are classified into 12# chrome corundum bricks, 30#chrome corundum bricks, 60# chrome corundum bricks, and so on.
Chrome corundum bricks produced by RS company are exported to many countries in the last 10 years, and the application performance is proved to be reliable. No matter what quality standard you have, our experienced engineers can design corresponding products to meet it. We once produced 120T chrome corundum bricks for South Africa customers in 10 days, and the goods are delivered in 13 days, including third-party inspection time.

Chrome Corundum Bricks Application

Chrome corundum bricks have a much longer life than corundum bricks when they are used in steel ladles and carbon black reaction furnaces. Due to the good abrasion resistance of Cr2O3-Al2O3 bricks, they are widely used in the nonferrous metals smelting industry. Chrome corundum bricks are also used in fertilizer factory gasifying furnace lining, their thermal shock resistance and corrosion resistance are very good. Chrome corundum bricks produced by metal chromium slag are widely used in zinc smelting electric furnaces and volatilizing kilns.

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Jun 30, 2021
Mullite Refractory Bricks

Mullite Bricks Characteristics

Good thermal shock resistance
Low high temperature creep rate
Good acid and weak alkaline slag corrosion resistance.
High refractoriness and mechanical strength.

Sintered mullite bricks

Sintered mullite bricks adopt synthesized mullite aggregates, and fines, or white corundum, quartz, and pure clay powder mixture with the same chemical composition of mullite. The raw material is evenly mixed, then molded under high pressure, and finally sintered at the temperature of 1550~1600℃.

Sintered mullite bricks physiochemical index

Item Hot blast furnace mullite brick Stopper head mullite brick Blast furnace wall brick Fused synthesized mullite brick
Al2O3 % 80.0 68.3 72.0 75.1
SiO2 % 18.2 — — 20.1
Fe2O3 % ≤ 0.76 0.84 1.7 3.35
Apparent porosity % 15.6-16.5 ≤16.7 ≤22 12-16
Cold compression strength/Mpa 197-267 ≥77 ≥49 210-250
Rupture under load/℃ ≥1700 ≥1600 ≥1650 ≥1700
Bulk density g/cm3 2.77-2.79 2.53 2.68 2.56-2.66

Fused cast mullite bricks

Fused cast mullite bricks’ main raw materials are high alumina bauxite or industrial alumina, clay, or silica with proper ratio. The mixed material is melted in electric arc furnaces, cast into shape, and then annealed to make the final mullite bricks. The main mineral ingredient of fused cast mullite bricks is mullite, which’s chemical composition is 3Al2O3·2SiO2.

Fused cast mullite bricks physiochemical property

Item Hot blast furnace mullite brick
Al2O3 % 70.1-75.47
SiO2 % 19.32-21.6
Fe2O3 % 0.92-1.90
Apparent porosity % ≤ 10
Cold crushing strength/Mpa 250-500
Rupture under load/℃ 1700
Bulk density g/cm3 2.9-3.3
Refractoriness ℃ 1730-1800
Thermal expansion rate %(20-1000 ℃) 0.60-0.65

Mullite Bricks Applications

Mullite bricks are mainly used in the inner lining of various parts of thermal kilns and furnaces for different industries, such as the steel and iron industry, chemical industry, glass industry, ceramic industry, and so on. For example, mullite bricks are widely used in hot blast furnaces for iron making, used in glass kiln main body feeding channel, regenerative chamber, clarification tank wall. Mullite bricks are also used in rotary cement kiln and rotary lime kiln inner lining. The physiochemical index of mullite bricks is different for different applications.

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Jun 30, 2021
Corundum Refractory Bricks

Rebonded fired corundum bricks are made from sintered corundum aggregates and fines. The production process of fired corundum bricks is: batch material formulation, mixing, tempering, machine pressing, high-temperature sintering. RS-produced corundum bricks have better thermal shock resistance and slag corrosion resistance than other products, because a little amount of synthesized mullite clinker, silica, kyanite, or sillimanite concentrate powder is added into raw materials to form mullite during sintering. The quantity of fine powders also has a significant influence on corundum brick density and strength, the increase of fine powder can greatly increase corundum brick density and strength, especially the addition of ultra-micro powder greatly improves corundum bricks high-temperature performance.

Fired corundum bricks physiochemical indexes

Item SJGZ-1 SJGZ-2 SJGZ-3 SJGZ-4 SJGZ-5
SiO2 % 0.15 0.24 0.28 0.11 0.48
Al2O3 % 99.51 99.30 98.82 99.60 97.42
Fe2O3 % 0.11 0.08 0.01 0.04 0.06
R2O % 0.026 0.12 / 0.14 0.43
Apparent porosity % 18 16.2 17~18 18 19
Bulk density g/cm3 3.20 3.23 3.25~3.26 3.23 3.09
Crushing strength Mpa 133.5 96 85.2~90.4 106.59 96.2
Refractoriness under load ℃ >1700 >1800 >1700 >1700 >1700
Reheating linear change rate % 0~+0.1 / / 0~±0.1 -0.3
Thermal shock resistance/times (1100℃, water cooling) 23 18 >20(1000℃, air cooling) 13 /

Rebonded fused corundum bricks are made from fused corundum clinker aggregate and fine powders. During fused corundum bricks production, the raw materials are strictly selected to promise the good quality of corundum bricks. For brown corundum bricks production, brown corundum contained ferrosilicon or other impurities should be removed. For white corundum bricks production, flake-like crystalline sodium aluminate and other eutectics should be removed.

Fused corundum bricks have high purity, therefore, the sintering of fused corundum bricks is difficult, sintering temperature should be higher than 1800℃. RS ultra-high-temperature periodic kiln is specialized for fused refractory brick production.

Fused corundum bricks physiochemical indexes

Item α-corundum bricks a-β corundum bricks β corundum bricks
SiO2 % <0.5 <1.5 <0.5
Al2O3 % >99 >94 >94
Fe2O3 % <0.1 <0.1 <0.1
Na2O % <0.8 <4.5 <7
MgO % <0.1 <0.1 <0.1
TiO2 % <0.1 <0.1 <0.1
Apparent porosity % 0~20 0~5 5~15
Bulk density g/cm3 >3.8 >3.4 >3.0
Modulus of rupture Mpa >70 >150 >20
Refractoriness ℃ >1900 >1875 >1875

RS Kiln Refractory not only has rich experience in corundum bricks production but also produces composite corundum bricks, such as chrome corundum bricks, zirconia corundum bricks, titania corundum bricks, and so on. Some properties of composite corundum bricks are better than pure corundum bricks.

RS Kiln Refractory customized service

RS Kiln Refractory not only supplies regular refractory products but customizes various kinds of products. The whole series of corundum bricks: α-corundum bricks, β corundum bricks, a-β corundum bricks, fired corundum bricks, fused corundum bricks, white corundum bricks, brown corundum bricks, sub-white corundum bricks, tabular corundum bricks and so on all can be customized according to application fields and purity requirement.

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