The classification and usage of silica ramming mass

 Intermediate frequency furnace knotted material also calls the intermediate frequency furnace lining material, intermediate frequency furnace, silica ramming mass, intermediate frequency furnace refractory ramming material dry vibrating material, intermediate frequency furnace, tie points acidic, neutral and alkaline materials, knot acidic materials in high purity quartz, fused silica as the main raw material, compound additives for sintering agent; Neutral knot material with high alumina, aluminum material as the main raw material, sintering agent by the composite additive; Knot alkaline materials in high purity fused corundum and high purity fused magnesia, high purity spinel as main raw materials, sintering agent for compound additives.

Knot acidic, neutral and alkaline materials are widely used in the coreless medium frequency furnace, induction furnace, the knot as intermediate frequency furnace to molten gray iron, ductile iron, can be calcined cast iron, vermicular cast iron and cast iron alloy, molten carbon steel, alloy steel, high manganese steel, tool steel, heat-resistant steel, stainless steel, melted aluminum and its alloy, melting copper, brass, copper and bronze, copper alloy, etc.

Our company’s intermediate frequency furnace lining material main be silica ramming mass and medium ramming mass. Silica ramming mass can reach 25 heats, and the medium ramming can be sure at least 60 heats. We?can also provide the workers and designs.?We Changxing Refractory Material Co.,LTD is professional manufacturer and supplier of refractory materials for more than 30 years. Our high quality silica ramming mass are good sold to many countries say South Africa, Bangladesh, Indonesia, Malaysia, etc. Shall any interests, welcome to contact us.

Article Source:The classification and usage of silica ramming mass
Company name: Henan Xinmi Changxing Refractory Materials Co.,Ltd
Email: info@cxrefractories.com
Website:http://www.cxrefractories.com

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
Email: info@cxrefractories.com
Website:http://www.cxrefractories.com

Refractory bricks used for different parts of blast furnace

 Blast furnace is the main equipment for ironmaking, and clay brick is the earliest furnace lining material used in blast furnace. Blast furnace has the advantages of large output, high productivity and low cost, which is unmatched by other ironmaking methods.

The refractory materials and refractory bricks used in diffreent parts of blast furnace are as follows.

(1) Furnace hearth
One of the main functions of furnace hearth is to hold molten iron safely. The hearth refractory material must be stable enough when the temperature is highter than 1500 ℃. So for furnace hearth bottom, we need to choose carbon brick which has the advantages of anti-molten iron penetration, good melting, alkali resistance erosion, good thermal conductivity. And we can use small carbon brick to take the place of large carbon block, or construct ceramic rings on the carbon bricks.

(2)Tuyere zone and bosh
Temperature in tuyere area and furnace bosh is the highest in the blast furnace. The hot gas temperature produced in front of the tuyere rises at a high speed, the temperature can reach 1600 ℃ and higher. When 1450 ~ 1550 ℃molten iron and slag flow furnace hearth and finally flow to the furnace bosh, there will be a variety of metallurgical reactions happen in this area violently. Those two areas need refractory materials with characteristics of good resistance to high temperature and slag erosion, good alkali resistance, anti carbon dioxide and anti water oxidation. China refractory bricks we can use in this area are corundum brick, alumina carbon brick, hot pressed semi-graphite carbon brick, SiC brick and so on.

(3)Furnace bosh and lower furnace stack
The lower furnace stack is the position of root cohesive zone where the temperature is quite high, but slag layer or stable slag layer self protection can not be formed. This are need ds refractory materials which can bear severe temperature fluctuations, and also has advantages of alkali metal erosion, zinc erosion, carbon monoxide erosion, etc. What’s more, refractory materials used in furnace bosh and lower furnace stack should have good thermal shock stability, high temperature resistance, good alkali resistance and other properties. Refractory bricks can be used in these two areas are high alumina brick, corundum brick, alumina carbon brick, SiC brick and so on.

(4)The middle and upper part of furnace stack
The furnace stack middle part’s temperature is lower than that of furnace stack lower part. People genarally use high alumina brick, corundum brick and silicon carbide in furnace stack middle part. The temperature in furnace stack upper part is relatively lower than other parts, and it mainly affected by the wear and impact of the burden, alkali metal, zinc and carbon deposition erosion. This area requires refractory material has advantages of good wear resistance, good alkali resistance and good thermal shock stability. Refractory bricks can be used in this area are clay brick, high alumina brick, sillimanite brick, corundum brick. There is a trend that cooling walls are taking the place of refractory bricks used in blast furnace.

Article Source:Refractory bricks used for different parts of blast furnace
Company name:Henan Xinmi Changxing Refractory Materials Co.,Ltd
Email: sales1@chinafirebrick.com
Website:http://www.chinafirebrick.com/

The advantages and use of chrome corundum brick

 Chrome corundum bricks refer to corundum refractory products containing Cr2O3. At high temperatures, Cr2O3 and Al2O3 form a continuous solid solution, so the high temperature performance of chromium corundum products is better than pure corundum products. The chromium corundum bricks used in the gasification furnace of the petrochemical industry should be of low silicon, low iron, low alkali, high purity, and also have high density and strength. In the most widely used chromium corundum products, the content of Cr2O3 is mostly in the range of 9%~15%. The main mineral composition is α-Al2O3-Cr2O3 solid solution. The secondary mineral composition is a small amount of composite spinel (or no composite spinel), refractory bricks with a chromium oxide content of 1% to 30%. There are two types of cast chromium corundum bricks and sintered chromium corundum bricks. In general, chromium corundum brick refers to sintered chromium corundum brick.

In high purity corundum material add Cr2O3, no matter how much the amount, not only will not reduce the fire performance of materials，can make refractory performance of material improved. 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: The advantages and use of chrome corundum brick
Company name: Henan Xinmi Changxing Refractory Materials Co.,Ltd
Email: info@cxrefractories.com
Website:http://www.cxrefractories.com

Erosion of magnesia carbon brick in the ladle furnace

In the ladle, due to the complex physical and chemical environment of the slag line, the furnace lining is the most vulnerable to damage. The chemical attack of steel slag on the magnesia carbon brick is mainly through the dissolution of magnesia and the oxidation of the graphite in the brick body. Under the combined action of two factors, the magnesia carbon brick is damaged.

1. The effect of alkalinity: the lower the alkalinity of the slag, the more beneficial it is to the erosion of magnesia-carbon bricks. The increase in alkalinity of the slag will reduce the activity of FeO in the slag, and the decrease of FeO activity will lead to the diffusion capacity of FeO.

2. The influence of MgO: Osbom et al. found that the MgO content in the reaction layer of the residual bricks of the LF slag line is very high. When the MgO content in the slag is low, it will affect the refractory magnesia carbon brick. The erosion rate of bricks is very large, and the lower the alkalinity, the faster the erosion of magnesia carbon bricks.

3. The influence of Al2O3: Al2O3 in the slag will reduce the melting point and viscosity of the slag, which greatly increases the penetration and erosion of the magnesia carbon brick by the slag, and can also corrode the magnesia from the magnesia grain boundary, making periclase Dissociate.

4. The influence of FeO: Firstly, FeO in the slag easily reacts with the graphite in the magnesia carbon brick at high temperature, and produces bright white iron beads to form a decarburized layer as shown in Figure 1. Secondly, the magnesia will interact with the graphite in the slag. FeO will form a low melting point of rich magnesium. AT&S believes that in the process of repeated heating and cooling of the ladle, due to the phase transformation between the magnesium richite and the mafic ore accompanied by the volume change, the magnesia on the working surface will crack, which will lead to the formation of magnesia. Dissolution, foreign studies believe that the increase in iron content in steel slag is detrimental to the life of ladle magnesia carbon bricks. First, iron oxides accelerate the oxidation of graphite, and secondly, it increases the solubility of MgO in the slag and accelerates the dissolution of periclase. The combined effect of the two is the erosion of magnesia carbon bricks.

Article Source:Erosion of magnesia carbon brick in the ladle furnace
Company name: Henan Xinmi Changxing Refractory Materials Co.,Ltd
Email: info@cxrefractories.com
Website:http://www.cxrefractories.com

The greenization of refractories for the cement industry

 Refractory is important, necessary and basic material for high temperature industry. It can’t be health development without the technological progress and innovation of refractory materials.

The state of ministry of industry and informatization. Ministry of Science and Technology and Environmental Protection Department clearly put forward that using the chrome free alkaline refractory to replace of chrome refractory.

America has stopped using the chrome?refractory. Japan also has used other material instead of magnesia chrome bricks. In our country, magnesia alumina spinel, magnesium iron spinel and iron magnesium aluminum spinel brick have successfully used? in large new dry process cement rotary kiln sintering zone and transition zone . The service life of these bricks has reached or exceed the magnesium chrome bricks. The greenization of refractory has become an important development strategy for the sustainable development of the industry.

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:The greenization of refractories for the cement industry
Company name: Henan Xinmi Changxing Refractory Materials Co.,Ltd
Email: info@cxrefractories.com
Website:http://www.cxrefractories.com

The properties of refractory materials

 Refractory inorganic nonmetallic material category, is the indispensable basic material, high temperature industry is mainly used in steel building materials non-ferrous machinery petrochemical industry the development of these industries are inseparable from the progress of refractory, refractory industry has become the fundamental guarantee of the national economy development, the escort for the steady development of high temperature industry in recent 20 years,?refractory material?industry of China is rapid development, has become the world's largest refractories production and consumption power, but also become the world's largest exporter refractory The increasing demand for?refractory materials?directly stimulates the rapid development of upstream?refractory?raw materials, and the reprocessing of raw materials is also an important development direction in the future.

Refractory mainly composed of magnesite bauxite, graphite alumina silica and other inorganic nonmetallic materials, plus a certain amount of additives, through a certain proportion of the allocation of inorganic nonmetallic?materials in the refractory?field is very widely used, huge refractory demand for inorganic nonmetallic materials has brought a broad market space.

Article Source:The properties of refractory materials
Company name: Henan Xinmi Changxing Refractory Materials Co.,Ltd
Email: info@cxrefractories.com
Website:http://www.cxrefractories.com