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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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Jun 30, 2021
Cordierite Mullite Bricks
Item Cordierite Mullite
Al2o3 39
SiO2 48
MgO 7.0
Bulk Density(g/cm3) 1.85
Show Porosity(%) 28
20℃ Flexural strength  (Mpa) 11.2
1250℃Flexural strength (Mpa) 8.7
200-1000℃Expansion coefficient 0.79
20℃Specific heat（KJ/Kg. K） 1.0
The highest working temperature 1300℃

Cordierite is the special grade raw material for the production of high-performance thermal shock resistant refractory products, with the addition of cordierite(MgO：13.8％、Al2O3：34.8％、SiO2：51.4％), its content will be high in the final products. Cordierite refractories have high mechanical strength, low thermal expansion coefficient, their modulus of rupture is as high as 95Mpa, linear expansion coefficient is about 2.0×10-6℃-1 between 20~800℃. Cordierite bricks are mainly used as a refractory slab, regenerator slabs, base plate, porous plate, push plate, supporting bricks, and so on. High thermal shock resistant cordierite refractories are usually produced by α-Al2O3 talc, Suzhou clay, while regular thermal shock resistant cordierite bricks are made by talc, chamotte and bauxite.

Mullite is the general name of aluminum silicate series minerals. Mullite is a chemically stable binary compound of Al2O3-SiO2 series compounds. Except for the mullite (3Al2O3·2SiO2) phase, mullite refractories with lower Al2O3 content also have a little amount of glass phase and cristobalite, those with higher alumina content also have a little corundum phase.

What is cordierite mullite brick?

Cordierite mullite brick adopts sintered mullite, andalusite, tabular corundum, and cordierite as the main raw material, added with ultra-micro powder to reinforce the matrix. The processing procedures of cordierite mullite bricks are mixing, molding, drying, and sintering, As the sintering temperature zone of cordierite, is very sharp, sintering temperature control is the key factor for its quality. Mullite cordierite bricks produced by this craft not only have excellent thermal shock resistance(after 100 times of 1100℃ water cooling test, there is no crack) but also have excellent high-temperature performances( refractoriness under load is higher than 1500℃). Mullite cordierite bricks are popularly used in the ceramic industry such as kiln vehicle surface, porous push plate, roller kiln gasket, sagger, and so on, as well as the ceramic combustor of hot blast furnaces.

The raw material composition of thermal shock resistant cordierite mullite bricks is between Al2O3-MgO-SiO2 ternary series cinoenstatite and cordierite, the sintering range is very narrow. The raw material consisted of Kaolin and 10~30% of talc has a sintering scope of 90~240℃. When talc content is 40%~70%, the sintering scope drastically drops to 10~30℃. The green body composed of 30%~40% talc, 30~40% of plastic clay, and about 20% of calcined Al2O3 can produce porous refractory products with excellent thermal shock resistance. When sintered at 1380℃~1410℃, products with 60% of cordierite can be obtained. To get as much cordierite as possible, and to avoid cordierite discomposing into mullite and glass phase during high-temperature sintering, the raw material can be proportionally mixed, molded, and sintered at 1350℃ to pre-synthesize cordierite, and then ground to powder, molded again, and finally sintered at 1400℃. The produced cordierite bricks have an expansion coefficient of 1.4×10-6℃-1.

Cordierite mullite bricks have good thermal shock resistance, small thermal expansion coefficient. Between 20~100℃, the linear expansion coefficient of porous cordierite products is only (1～1.2)×10-6·℃-1, at 20～200℃, the linear expansion coefficient is（1～1.5)×10-6℃-1, while it is 2.0×10-6℃-1 between 20~800℃. Since the forming temperature range of cordierite is very narrow, under burned products don’t have enough cordierite, while over burnt cordierite decomposes into mullite and glass phase again. So, adopting high alumina cordierite mullite-based raw materials can not only enlarge cordierite forming temperature range, but also avoid cordierite decomposition in high temperature, as well as the enhancement of quality.

Cordierite mullite bricks have better performance than fireclay cordierite products. According to the forming properties of cordierite, the sintering temperature should not raise too quickly at the range of 900~1200℃, so crystal water can be evaporated and talc can be better decomposed. Cordierite is formed at 1200~1300℃, so the sintering time at this temperature should be promised to obtain more cordierite, temperature ascending speed should be slow and stable at this temperature zone.

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Jun 30, 2021
Silica Brick

SiO2 has different types of crystals in different temperatures, and the transform between the crystals will cause the change of the bulk. So there is close contact between the changes of SiO2 crystals and the produce, performance, and usage of silica bricks. During the heating, there will be changes of the bulk, and cristobalite changes most, then quartz, phosphorus quartz is the slowest of all and it also has good heat conductivity. Coke oven should use silica brick with small true density. And the phosphorus quartz is better than others.

Application For Silica Brick

Mainly used in the construction of regenerative chamber, chute, combustion chamber, cooking chamber, furnace roof, etc. parts of the coke ovens. Silica Brick For Glass Kiln Mainly used for coke oven of coking chamber and combustion chamber partition, steel open hearth of the regenerative chamber and sediment chamber, soaking furnace, glass melting furnace, refractory silica brick materials, and ceramic firing kiln and kiln of the vault and other supporting parts. Also used in hot blast stove of high temperature bearing parts and acid open hearth furnace roof.

Advantage For Silica Fire Brick

1) Silicon oxide is above 95%.
2) Good acid erosion resistance.
3) High softening point with temperature.
4) No shrink in burn repeatedly.
5) Temperature of refractoriness under load is above 1650º C

Stable Capability, High Quality, Excellent Service, Competitive price is the most important advantage of our products.

Physical and Chemical Indicators

Item Silica brick

for coke oven

 Silica brick

for glass kiln
Furnace bed others BG-96A BG-96B BG-95A BG-95B
SiO2% ≥ 94 96 96 95 95
Fe2O3 %≥ / 0.8 1.0 1.2 1.2
0.2MPa RUL°C ≥ 1650 1680 1670 1660 1650
FUSION INDES:

one BRICK<20kg

one BRICK ≥20kg

 /
/		 0.5
0.6		 /
/		 0.7
0.7		 /
/
True density g/cm3 ≤  2.34       2.35 2.34
PLC % 1450°C×2h +0.2        0 /
AP % ≤ 22(23) 24 22(24)
Thermal expansion

1000°C % ≤

 1.28 1.30 /
CCS  MPa ≥
one brick<20kg
one brick≥20kg		 30 25 35(30)
30(25)
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Jun 30, 2021
Fused Silica Brick

Fused Silica Brick Advantage

1.Fused silica brick has high purity, corrosion-resistant
2.Fused silica block has small thermal expansion coefficient
3.Fused silica refractory brick have small thermal shock resistance

Refractory fused silica brick has high viscosity at high temperature, high strength, strong slag resistance, and strong impact resistance, low thermal conductivity, small drying, and firing shrinkage.

Fused Silica Brick specification

Sio2 》 99
Fe2o3 《 0.3
Flux index 《 0.4
0.2Mpa refractoriness under load 》 1650
Apparent porosity 《 22
Cold crushing strength 》 35
Bulk density 《 30
Thermal shock water-cooled at 1100℃（times） 》 2.34

Fused Silica Brick Application

Fused silica bricks have good thermal shock resistance, small thermal expansion, low bulk density, and small thermal conductivity, which is convenient for heat preservation and reduces heat loss. Refractory brick mainly used in flow aluminum tanks, aluminum gates and is suitable for the upper wall of a furnace for the masonry of low alkali borosilicate glass.

Fused Silica Brick Supplier in Rongsheng Refractory Factory

Rongsheng Refractory Factory is a fire-resistant and thermal insulation material production enterprise. RS firebrick factory is a comprehensive enterprise integrating scientific research, testing, development, production, sales, and customers. Rongsheng refractory brick has one production line for stereotyped and amorphous fire-resistant and wear-resistant refractory products. One production line is enough to meet the processing capacity of 80,000 tons of high-quality products per year, which has a construction team with professional anti-corrosion and thermal insulation engineering level and kiln masonry second-class qualification. The scope of construction includes the completion of turnkey projects from contract signing, material supply, metal spraying, corrosion-resistant spraying, material masonry insulation, oven, and operation. It has comprehensive testing methods and can guide us to each product. Indicators and each subtle production link.

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Jun 30, 2021
Silicon Carbide Mullite Bricks

Silicon Carbide Mullite Bricks Characteristics

Abrasion Resistance
SiC mullite brick’s principal phases are high rigidity SiC, mullite, and corundum, meanwhile, SiC mullite bricks have high structural density, its bulk density is between 2.7 and 3.0g/cm3. So SiC mullite bricks have good abrasion resistance. Silicon carbide mullite brick’s density, strength, and abrasion resistance are significantly better than high alumina bricks and magnesia alumina spinel bricks.

Spalling Resistance And Thermal Shock Resistance

SiC in silicon carbide mullite bricks has high thermal conductivity, small thermal expansion rate, so SiC carbide mullite bricks have good thermal stability, max. thermal shock times can reach 46 times(1100℃, water cooling).

Insulating Performance

Silicon carbide mullite brick’s thermal conductivity(≤2.3W·(m·K) is lower than spinel bricks, and thus has a better heat preservation effect.

High-Temperature Performance

SiC mullite brick’s refractoriness under load is above 1500℃, max. is 1690℃, can endure high-temperature impact and won’t soften or deform.

Silicon Carbide Mullite Bricks Physiochemical Index

Item GM1650 GM1600 GM1550 GM1680
Al2O3 % 63 60 57 63
SiO2+SiC % 30 30 30 30
Apparent porosity % 17 17 19 17
Cold crushing strength Mpa 85 90 90 100
Refractoriness under load ℃ (0.2Mpa) 1650 1600 1550 1680
Thermal shock resistance(11oo℃, water cooling) 10 10 12 13
Bulk density g/cm3 2.65 2.60 2.55 2.65
Cold abrasion resistance cm3 5 5 5 5
Thermal conductivity(w/m·k) 1.7 1.7 1.7 1.7

Silicon Carbide Mullite Bricks Application

Due to silicon carbide mullite brick’s good abrasion resistance, high refractoriness, and thermal shock resistance, it is popularly used in rotary cement kiln sintering zone, transition zone, and so on, where material rolling friction, high-temperature thermal stress, temperature fluctuation, and material corrosion are severe.

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