Causes of erosion of blast furnace body and selection of refractory materials

 

Erosion reason	Requirements for refractory properties
1.Wear of charge drop process	1.High crushing strength
2.Erosion wear of upward gas flow	2.The performance of alkali resistant metal corrosion resistance is good
3.Alkali metal erosion	3.Low porosity
4.Destruction of CO	4.Low iron oxide content
The upper and middle furnace refractories for blast furnace are: clay brick, sillimanite brick, dense clay brick, high alumina brick etc.
The lower part of the shaft, belly erosion causes
Erosion reason	Requirements for refractory properties
1.Chemical erosion of primary slag	1.Slag resistance is good
2.Wear of down charge	2.The performance of alkali resistant metal corrosion resistance is good
3.Erosion of metallic iron	3.High - temperature strength
4.Erosion wear of gas flow	4.Good thermal conductivity
5.Spalling due to thermal shock	5.Low porosity
?	6.Good thermal shock stability
From the waist to the lower part of the shaft lining, thermal shock is decreased by high temperature and high pressure gas charge and increase the wear and temperature changes, but also by the chemical high FeO high basicity slag erosion, more serious is alkali metals and zinc vapor caused by carbon deposition and chemical reaction, the refractory brick organization embrittlement lose strength. And suitable for refractory brick is: aluminum brick, silicon carbide, hot pressing small carbon bricks and semi graphitized carbon - silicon carbide brick.
Lining erosion reason
Erosion reason	Requirements for refractory properties
1.Corrosion and penetration of molten iron	1.Resistance to molten iron corrosion, good permeability
2.Circulating erosion corrosion of molten iron	2.Good thermal conductivity
3.Alkali corrosion	3. The performance of alkali resistant metal corrosion resistance is good
4.Destructive effect of thermal stress	4.Low porosity , microporosity
Hearth wall masonry taphole above by erosion of iron, iron mouth following the "dead iron layer", by the iron soaked, by erosion of molten iron flow in the furnace wall and the bottom of the junction. The masonry has good anti erosion ability of slag, molten iron and mechanical washing. Most of the hearth and bottom of large and medium blast furnace are made of carbon brick and carbon brick ceramic cup composite hearth.

We Changxing Refractory Material Co.,LTD is professional manufacturer and supplier of refractory materials for more than 30 years. Our high quality magnesia carbon bricks are good sold to many countries say South Africa, Bangladesh, Indonesia, Malaysia, etc. Shall any interests, welcome to contact us. Our team would make best to be your reliable partner!

Article Source:Causes of erosion of blast furnace body and selection of refractory materials
Company name: Henan Xinmi Changxing Refractory Materials Co.,Ltd
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High alumina brick and alkali brick

High alumina brick
High alumina brick has high compressive strength, high refractoriness under load and good thermal shock resistance. Because of its low cost with high quality, it is widely used in varieties of cement kilns. When to be used in arch crown, calcined alumina brick is better.

High alumina bricks suitable for cement kilns include phosphate bonded alumina brick, phosphate bonded high alumina wear-resistant brick, anti-stripping alumina brick, chemically bound (special) alumina brick and general alumina brick and so on.

Alkali Brick Series
Alkali brick has excellent alkali corrosion performance, under certain conditions, it will react with the alkali compound kiln materials and kiln gas, rapidly forming enclosed type dense protective enamel layer on the turn, preventing the continuing internal mixing and bricks "base crack ", which is a indispensable kiln lining material in NSP kiln. This series bricks include ordinary alkali-resistant brick, high-strength alkali-resistant brick, insulation alkali-resistant brick and arch type alkali-resistant brick.

Changxing refractory provides refractory products, calcium silicate products, castable & mortar, china refractory brick, ceramic fiber felt, ladle & tundish nozzle, ceramic fiber with high quality for you. Such as high alumina refractory bricks, magnesia carbon brick, clay refractory bricks and other refractory products.
Article Source:High alumina brick and alkali brick
Company name: Henan Xinmi Changxing Refractory Materials Co.,Ltd
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The high temperature compressive strength of the refractory fire bricks

The high temperature compressive strength of the refractory brick china (abbreviated as HCS) refers to the maximum pressure (in MPa) per unit area of the material at high temperatures above 1000-1200 °C. The compressive strength of the refractory material generally varies with increasing temperature. From the normal temperature from the temperature rise, the intensity of a straight line down. Since then, some of the material continues to decline with increasing temperature; some materials rise as the temperature rises to a certain extent and rises to a maximum temperature at a specific temperature, followed by a sharp drop. The following figure is a number of commonly used china refractory brick high temperature compressive strength with temperature changes.
The change in the high temperature compressive strength of the refractory fire brick is controlled by changes in certain components, especially those in which the matrix or its bound phase occurs at high temperatures. In general, the sintered refractory raw material, which is entirely composed of crystal, is prone to plastic deformation due to its grain and grain boundaries at high temperature, especially when its loading speed is small, so that the strength decreases with the temperature reduce. When some of the crystal phase between the melting point at high temperature or the formation of melt, such as silica brick, clay brick and high alumina brick, the matrix is mainly composed of glass phase, with the temperature rise, the strength of such multi-phase material the microstructure decreases with temperature. When the temperature is further improved, due to the viscosity of the glass phase from brittle to toughness, so that the material between the particles more firmly, so that the strength was significantly improved. Then, as the temperature increases, the melt viscosity of the material decreases sharply, and the strength of the material decreases sharply.
Changxing refractory are mainly producing high alumina brick, high alumina refractory bricks, alkali resistant brick, castable, clay brick, insulation brick, light high alumina brick, low creep high alumina brick, high aluminum wear Brick, high aluminum lightweight insulation brick, clay insulation brick, if you have any need please contact us anytime.
Article Source: refractory fire brick
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The details of high alumina brick

High alumina brick is containing Al2O3 more than 48% of aluminum silicate products. According to the different composition of minerals, high-quality refractory products are divided into corundum, mullite a just jade and silicon stone three categories. Corundum products, AI2O3 content of more than 95%, the basic mineral corundum (A12O3), raw materials for natural or artificial corundum, but also fused corundum products. The basic mineral of mullite-corundum is mullite (3A12O3.2SiO2), the rest is corundum and glass phase. Silica stone stone raw materials for the sillimanite (Al2O3 · SiO2), the basic minerals are mullite and glass phase. A large number of industrial applications are mullite and silicon wire stone high alumina brick. With the increase of Al2O3 content and the decrease of glass phase, the refractoriness and resistance to rapid cooling of the products are improved, and the resistance to slag resistance, especially for acid slag, is enhanced.
The main raw material of high alumina bricks is high bauxite, which contains minerals such as boehmite, boehmite and kaolinite. The bauxite is calcined and the minerals are converted to corundum and mullite crystals at different temperatures. And in the 1400-1500 ℃ temperature, corundum and quartz combined with the second mullite, crystal growth. In the high-aluminum clinker with soft raw clay as a binder. The production process of high alumina brick and clay brick is basically the same.

Most of the performance of high alumina brick is better than refractory fire brick, but the thermal stability is slightly lower than clay brick. With the different content of Al2O3, ordinary high alumina brick is divided into three grades: (LZ) -65, (LZ) -55, (LZ) -48.

As the main component of high alumina brick AL2O3 is an amphoteric oxide, acid and alkaline slag erosion can resist the erosion of iron oxide skin also have a certain resistance. It is often used to build the soaking furnace bottom, the lower furnace wall, the exhaust outlet at the vault, in the continuous heating furnace, the bottom of the furnace wall, burner brick, ceiling can be used high aluminum brick masonry. High aluminum bricks are also commonly used as lattice bricks, repairing thermal storage rooms.

High alumina brick in the industrial advanced countries, the proportion of total refractory materials is about 8-14%, China's high alumina bauxite rich resources for the development of high alumina brick to create favorable conditions.

Article Source: Generality High Alumina Brick
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