Mullite Dense Brick are produced with selected bauxite chamotte by
advanced process and strict quality control. The main mineral
components are corundum and mullite phases. Its features are
excellent high temperature mechanics and chemical corrosion
resistance.
If Al2O3 content is higher than 90%, it is called corundum brick.
Due to different resources, national standards are not completely
consistent. For example, European countries have stipulated that
the lower limit of Al2O3 content for high-alumina refractories is
42%. In China, according to the content of Al2O3 in high alumina
bricks, it is usually divided into three grades: Grade I──Al2O3
content>75%; Grade II──Al2O3 content is 60～75%; Grade III──Al2O3
content is 48～60%.
The production process of Mullite Dense Brick and multi-clinker
clay bricks are similar.
The difference is that the proportion of clinker in the ingredients
is higher, which can be as high as 90-95%.
The clinker needs to be sorted and sieved to remove iron before
crushing, and the firing temperature Higher, such as Ⅰ, Ⅱ high
alumina bricks are generally 1500～1600℃ when fired in tunnel kiln.
Production practice in China has proved that before crushing,
high-aluminum clinker is strictly sorted and classified, and stored
in tiers.
The use of bauxite clinker and combined clay fine grinding method
can improve product quality.
Production process:
The production methods of Mullite Dense Brick and clay bricks are
basically the same.
Only some process parameters are different. There are also
processes such as crushing → mixing → molding → drying → firing →
inspection → packaging.
The compressive stress is better at low temperature, but slightly
reduced at high temperature, so the stack in the kiln is less than
1 meter. The production process of high-alumina refractory bricks
and multi-clinker clay bricks is similar.
The difference is that the proportion of clinker in the ingredients
is higher, which can be as high as 90%-9%. The clinker needs to be
sorted and sieved before crushing. The firing temperature is
higher. For example, high-alumina refractory bricks such as Ⅰ and Ⅱ
are generally 1500～1600℃ when fired in tunnel kiln.
Production practice proves that high-alumina clinker is strictly
selected and classified before crushing, and is stored in tiers.
The co-fine grinding method of bauxite clinker and combined clay
can improve the quality of high-alumina refractory brick
Aluminum oxide (Al2O3) content is higher than 48% aluminum silicate
refractory products.
A neutral refractory with an alumina content of more than 48%.Made
of bauxite or other raw materials of high alumina content after
molding and calcining.High thermal stability, refractoriness in
1770℃ above.Good slag resistance, used for lining steelmaking
electric furnace, glass furnace, cement converter, etc.
High charge soft, Mullite Dense Brick is a high grade refractory
material made of super grade bauxite, fused corundum and fused
mullite.
Application:
Mullite Dense Brick used for lining blast furnaces, hot blast
stoves, electric furnace tops, blast furnaces, reverberatory
furnaces, and rotary kilns. In addition, high alumina bricks are
also widely used as open hearth regenerative checker bricks, plugs
for pouring systems, nozzle bricks, etc. However, the price of high
alumina bricks is higher than that of clay bricks, so it is not
necessary to use high alumina bricks where clay bricks can meet the
requirements.
1. Iron&steel making industry:
Blast furnace,hot blast furnace(stove),pellet shaft furnace,hot
metal ladle,steel ladle, tundish,heating furnace,soaking pit
furnace,heat treatment furnace,refining furnace,reheating
furnace,metal mixter furnace,annealing furnace, cupola
furnace,electric arc furnace,induction furnace,AOD furnace,VOD
furnace,etc thermal technology equipment.
2. Non-ferrous Metal industry:
Smelting furnace,refining furnace,reverberatory furnace,converter
furnace.
3. Building materials industry:
Cement kiln,glass kiln,ceramic kiln,lime kilns,kiln car,tunnel kiln
4. Energy & Incineration:Coke oven,general
boiler,power,generation,boiler,circulating fluidized bed
boiler,electric furnace,carbon rosating furnace,waste incinerators.
5. Others: Petrochemical industry furnace.
