Ruizhi Refractory, refractory material, refractory manufacturer, refractory company, refractories: Classification and main properties of high aluminu...

Ruizhi Refractory, refractory material, refractory manufacturer, refractory company, refractories: Classification and main properties of high aluminu...: High Alumina Brick (1) cement kiln with high alumina brick Cement kiln combined with high alumina brick is a high bauxite clinker a...

Advantages and disadvantages of carbon blast furnace refractory material

refractories used in blast furnace

The main carbon refractories used in blast furnace are carbon brick, graphite carbon brick, graphite silicon carbide brick, self-bonding or nitrogen-bonded silicon carbide brick and ramming materials.

(1) Characteristics of carbon refractory for iron making

1) Carbon refractory is the ideal blast furnace refractory lining material, it has the following advantages:

① Carbon refractory  has high refractoriness, it will neither melts nor soften in blast furnace.

② Carbon refractory’s thermal expansion coefficient is small, it has a good volume stability in large temperature range.

③ Carbon-saturated molten iron will not erode carbon brick, in certain cooling condition, the corrosion of the slag to the Carbon lining is also small.

④ Carbon refractory has high thermal conductivity and electrical conductivity, using carbon refractory in the furnace bottom and hearth can make cooler play full performance, thereby extending the life of blast furnace lining material to prevent burning through.

⑤ Carbon refractory has excellent cutting performance, it can be made into shaped products in a very small size to meet the masonry requirements.

2) The biggest drawback of carbon refractories is that carbon and graphite burn in oxidizing atmosphere. When temperature reaches 700℃, carbon refractories begin react with carbon dioxide, and 500℃ it will react with water, and higher than 400℃ it will be oxidized. So for carbon brick’s exposed part, a protective layer should be built.


(2) Silicon carbide brick

Silicon carbide brick is a kind of inert material, it has good thermal conductivity, small expansion coefficient, high temperature strength, small creep deformation, and also silicon carbide brick has good anti-slag, anti-iron scouring and corrosion resistance, besides, silicon carbide’s oxidation resistance is better than carbon materials. The main problem is to find a combination of alkali-resistant metal corrosion. Also useful in nitride-bonded or self-bonded silicon carbide refractories. To extend the life of lower part of furnace, it is better to use silicon carbide brick.


(3) Aluminum carbon brick

Blast furnace aluminum carbon brick uses high quality bauxite and graphite as main raw material, being added a small amount of silicon carbide and additives, using resin as binder, and finally burnt through a compression-molding process. Aluminum carbon brick has the characteristics of high temperature resistance, good thermal conductivity, good alkali resistance, low porosity, small dimensional deviation and low price. It can be used in blast furnace heart, furnace waist, furnace body, iron mouth area, bottom of the furnace and other parts.

The characteristics of unshaped refractory are as follows.

Compared with shaped refractory, due to can celled the complex firing process, unshaped refractory suppliers production process is simpler, it is easy to use. Unshaped refractory has the advantage of plasticity, easy complex product molding, and conducive to mechanized construction, and low cost, and unshaped refractory’s using life is similar to that of refractory bricks. Its refractoriness and chemical stability is close to or can reach the level of similar refractory bricks. Besides, unshaped refractories can be prefabricated into large pieces.

Article source:

Advantages and disadvantages of carbon blast furnace refractory material

Email: sales@ruizhirefractory.com

Advantages and disadvantages of refractory bricks

refractory bricks

Refractory materials are generally divided into two types, unshaped refractories and shaped refractories. The most widely used refractory bricks are as follows:
1. Dolomite brick
Dolomite brick has good hanging kiln skin performance, good resistance to erosion, but it is easy to hydration and difficult to transport and custody.
2. Magnesia chrome brick
Magnesia chrome brick’s hanging kiln skin performace is good, it is used for firing belt. And its disadvantage is that magnesia chrome refractory brick manufacturers performs not quite well in thermal shock resistance.
3. Phosphate brick
Phosphate brick’s refractoriness is low, but it has high strength and high thermal shock resistance, it is usually used for kiln hood and so on.
4. Silicon carbide brick
Silicon carbide brick has good resistance to high temperature (1800 degrees centigrade, load softening temperature 1620-1640 degrees centigrade). Its thermal expansion coefficient is small, and silicon carbide brick has good resistance to acute cold and hot, good abrasion resistance. Silicon carbide brick is suitable for furnace cooling zone and kiln mouth.
5. Silicon mullite brick
Silicon mullite brick has good thermal shock resistance, high strength and good abrasion resistance. Silicon mullite brick is suitable for furnace transition zone.
6. Spinel brick
Spinel brick is mainly used for transition zone. It has good thermal shock resistance, good anti-reducibility, but its refractoriness is a little low.
7. High alumina brick
High alumina brick’s Al2O3 content is more than 75%, its refractoriness is higher than that of clay brick for sale. High alumina brick has good anti-acid and alkali erosion, it is suitable for cement kiln burning belt, etc. High alumina brick’s using life is long but its price is a little high.
8. Anti-peeling brick
Anti-peeling brick contains a small amount of ZrO. It has excellent resistance to alkaline, good anti-peeling performace and good slag resistance.

Article source:

Advantages and disadvantages of refractory bricks
Email: sales@ruizhirefractory.com

Advantages and disadvantages of carbon blast furnace refractory material

blast furnace refractory material

The main carbon refractory material used for blast furnace are carbon brick, graphite carbon brick, graphite silicon carbide ladle brick, self-bonding or nitrogen-bonded silicon carbide brick and ramming materials.

(1) Characteristics of carbon refractory materials for iron making

1) Carbon refractory is the ideal refractory for blast furnace refractory lining material, it has the following advantages:

① Carbon refractory  has high refractoriness, it will neither melts nor soften in blast furnace.

② Carbon refractory’s thermal expansion coefficient is small, it has a good volume stability in large temperature range.

③ Carbon-saturated molten iron will not erode carbon brick, in certain cooling condition, the corrosion of the slag to the Carbon lining is also small.

④ Carbon refractory has high thermal conductivity and electrical conductivity, using carbon refractory in the furnace bottom and hearth can make cooler play full performance, thereby extending the life of furnace lining material to prevent burning through.

⑤ Carbon refractory has excellent cutting performance, it can be made into shaped products in a very small size to meet the masonry requirements.

2) The biggest drawback of carbon refractories is that carbon and graphite burn in oxidizing atmosphere. When temperature reaches 700℃, carbon refractories begin react with carbon dioxide, and 500℃ it will react with water, and higher than 400℃ it will be oxidized. So for carbon brick’s exposed part, a protective layer should be built.


(2) Silicon carbide brick

Silicon carbide brick is a kind of inert material, it has good thermal conductivity, small expansion coefficient, high temperature strength, small creep deformation, and also silicon carbide brick has good anti-slag, anti-iron scouring and corrosion resistance, besides, silicon carbide’s oxidation resistance is better than carbon materials. The main problem is to find a combination of alkali-resistant metal corrosion. Also useful in nitride-bonded or self-bonded silicon carbide refractories. To extend the life of lower part of furnace, it is better to use silicon carbide brick.


(3) Aluminum carbon brick

Blast furnace aluminum carbon brick uses high quality bauxite and graphite as main raw material, being added a small amount of silicon carbide and additives, using resin as binder, and finally burnt through a compression-molding process. Aluminum carbon brick has the characteristics of high temperature resistance, good thermal conductivity, good alkali resistance, low porosity, small dimensional deviation and low price. It can be used in blast furnace heart, furnace waist, furnace body, iron mouth area, bottom of the furnace and other parts.

The characteristics of unshaped refractory are as follows.

Compared with shaped refractory, due to can celled the complex firing process, unshaped refractory suppliers production process is simpler, it is easy to use. Unshaped refractory has the advantage of plasticity, easy complex product molding, and conducive to mechanized construction, and low cost, and unshaped refractory’s using life is similar to that of refractory bricks. Its refractoriness and chemical stability is close to or can reach the level of similar refractory bricks. Besides, unshaped refractories can be prefabricated into large pieces.

Article source:
Advantages and disadvantages of carbon blast furnace refractory material
Email: sales@ruizhirefractory.com