The process of firing refractory bricks includes three process

 The process of firing refractory bricks includes three processes

1. Kiln installation

The so-called kiln loading refers to the operation process of reasonably arranging and stacking bricks that meet the technical conditions of semi-finished products in the kiln according to the structural characteristics of the kiln and the requirements of the thermal system when the products are fired. For the tunnel kiln, it is also called loading (kiln) car.

1) Determine the kiln installation height and kiln installation method according to different brick types. Usually, the kiln height of magnesia bricks and first-class high-alumina bricks is 1-1.1m; that of silica bricks is 1-1.7m; and that of clay bricks is between the two. Most of the bricks are installed flat, the silica bricks are installed vertically and the clay bricks are installed sideways.

2) According to different brick types, determine the kiln loading ratio of ordinary bricks and special-shaped bricks. Generally, the ratio of special-shaped bricks and ordinary bricks on the same kiln car is about 4:6. At the same time, it is necessary to determine the kiln installation positions of different varieties according to different brick types. Generally, the standard and ordinary bricks are installed in the lower part, and the special-shaped bricks are installed in the upper part, and some special-shaped bricks or adobes that are easy to crack when fired are packaged (bricks wrapped in bricks).

3) On the premise of ensuring the quality of firing, increase the density of bricks (that is, the amount of bricks per unit kiln car) to increase production and reduce fuel consumption.

Making a reasonable kiln installation plan is the premise to ensure the quality of the kiln installation, but if the kiln installation operation is improper, the qualified rate of the appearance of the fired product will be reduced. Therefore, in the production of refractory materials, the basic requirements for the quality of the kiln are to ensure that the brick stack is flat, stable and straight, to avoid bonding between the bricks due to high temperature firing, and to reduce the distortion of the fired products. In order to meet the above requirements, a layer of sand filling with a particle size of 0.5-3mm is usually evenly sprinkled between each layer of bricks when the kiln is installed. Products with different properties have different requirements for kiln filling sand. Usually, clay bricks and high alumina bricks use silica sand, bauxite chips, rice husk or rice husk ash; silica bricks use waste silica brick sand or silica sand; Magnesia bricks use magnesia or chrome ore.

2. Firing

The adobe undergoes a series of physical-chemical reactions during the firing process, making the adobe compact, increasing its strength, stabilizing its volume, and ensuring accurate dimensions. The whole firing process can be divided into three stages:

(1) The heating stage, that is, from the time when the product enters the kiln or is ignited to the time when the product reaches the highest temperature for firing. As the temperature increases, the liquid phase formation temperature and the phase synthesis temperature are reached. Due to the diffusion, flow, dissolution, precipitation, and mass transfer process of the liquid phase, the particles are further approached by the surface tension of the liquid phase to promote the densification of the green body. The strength is increased, the volume is reduced, the porosity is reduced, and the green body is sintered.

(2) The heat preservation stage at the highest firing temperature. Various reactions in the green body tend to be complete and sufficient, the amount of liquid phase increases, the crystalline phase grows further, and the brick body reaches densification. In the firing process of the product, not only the surface must reach the firing temperature, but also the interior of the product must also reach the firing temperature. This temperature homogenization process is achieved by heat transfer, which requires a certain amount of time. It can be seen that the larger the product and the higher the kiln density, the longer this time will be. In addition, due to the uneven temperature of various parts in the kiln, a certain holding time is also required.

(3) The cooling stage refers to the period from the highest firing temperature to the kiln exit temperature. During this stage, the structural and chemical changes that the article undergoes at high temperatures are essentially fixed. At the beginning of this stage, some physical-chemical changes are still going on in the product, such as the crystallization of the physical phase, the crystal transformation of some crystals, the solidification of the glass phase, and the generation of microcracks. The cooling system will affect the physical properties of the product such as strength and thermal shock resistance.

In order to reasonably fire various refractory products, the firing system of each product should be determined in advance, including: the maximum temperature of firing; the heating rate at each stage; the holding time at the highest temperature; product cooling The lower cooling rate; the nature of the atmosphere in the kiln in the above stages. The firing process of refractory products can be completed by two heating methods, that is, the products are fired at a lower temperature for a longer time, or at a higher temperature for a shorter time. But in fact, due to the slow heat transfer in the kiln and the uneven heating of the products in the kiln, there is a limit to the use of fast firing refractory products.

The firing system of refractory products is not only related to the variety, shape and size of refractory products, but also closely related to the type of firing equipment. For example, a large downdraft kiln requires a slower heating rate and a longer holding time to ensure the uniformity of the brick temperature. An unsuitable firing system will increase the reject rate and reduce the quality of the product. The proper firing system is based on theoretical guidance and practical experience.

3. Out of the kiln

Kiln exit is the operation process of taking out the burnt products from the kiln after cooling, or unloading them from the kiln car. The quality of the kiln operation has a direct impact on the appearance quality of the finished product. In the production of refractory materials, the following points should be paid attention to in the kiln operation:

(1) When taking and placing bricks, handle them with care to avoid appearance defects of the product due to careless operation out of the kiln.

(2) Products of different brick numbers should be stacked strictly separately, that is to say, products of different brick numbers cannot be placed on the same brick board when they leave the kiln, otherwise, it is easy to cause confusion when checking and selecting finished products. Because the appearance of some products with different brick numbers can be exactly the same, but there is little difference in a certain size (several mm or more than a dozen mm), if they are mixed on a brick board, it is easy to distinguish them when checking. The product of one of the brick numbers is mistaken as a waste product, which will not only cause waste, but also affect the use.

(3) Tool bricks (frame bricks, drawn bricks, etc.) should be arranged and stacked for continued use during kiln installation.

(4) Pay attention to safe operation and labor protection when leaving the kiln and transporting bricks.

We Changxing Refractory Material Co.,LTD is professional manufacturer and supplier of refractory materials for more than 30 years. Our high quality refractory products are good sold to many countries say South Africa, Bangladesh, Indonesia, Malaysia, etc.  

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High Alumina Bricks & Magnesia Bricks

The cause of slagging in ladle slag line

 1. For a long time to be poured, the top slag of molten steel cools and crusts, causing slagging on the ladle slag line.

(1) The cold heading steel process of Shaoguan Steel Plant requires bottom blowing of argon after the calcium treatment, weak blowing for 12-20 minutes. During the weak blowing process, the edge of the slag layer on the surface of the molten steel is basically in a static state. After a long period of temperature loss, the slag temperature continues decrease, the slag layer close to the ladle wall will solidify at the position of the ladle slag line, causing slagging on the ladle wall.
(2) The smelting cycle of the converter is shorter than the smelting cycle of the LF refining furnace, the pouring order is inadequate, the smelting speed of the previous process is too fast, the backlog of molten steel in the refining area is serious, and the waiting time is too long after the refining and smelting is completed until the continuous casting and casting. This is the main cause of slagging in the ladle slag line.

2. The Al2O3 content in the cold heading steel slag system is high, and the molten steel slag is sticky. After the refining is completed, the molten steel will solidify and condense at the position of the ladle slag line as the temperature of the slag surface decreases during the process of quenching.
According to field observations, when smelting aluminum killed steel, the ladle slag line is prone to slagging, while when smelting silico-manganese killed steel, the ladle slag line is slightly sticky.
The content of Al2O3 in aluminum killed steel slag is high [2]. In order to ensure the purity of molten steel, the amount of lime added is also large, forming a thicker and denser slag crust; silico-manganese killed steel does not contain Als, which produces Al?O? is also very small, so the amount of lime added is small and the slag layer formed is thin. It can be inferred that ladle slagging is greatly affected by the content of Al?O? in the slag.

3. The ladle slag line bricks are eroded seriously, causing depressions and slagging easily. Ladle slag line bricks refer to refractory bricks built from the third to the eighth layer of bricks from the bottom of the ladle mouth. After the ladle is filled with steel, the molten steel level fluctuates up and down with the amount of molten steel. When the converter smelting is finished, the partial oxide slag in the furnace is poured into the ladle along with the molten steel, commonly known as "slag". Sub-refining and slagging are used to remove excess oxygen in molten steel, that is, "deoxidation". The deoxidized slag is reduced slag.
As the alkalinity in the slag changes, the refractory bricks on the ladle wall that contact the slag are gradually dissolved and fall off, forming a depression in the ladle wall. When the alkalinity in the slag stabilizes, the slag and the ladle slag line bricks are mutually dissolved and combined to form slagging. The recessed wall of the slag will hang support points for the slagging, making slagging more and more easier.
In order to save costs and increase the turnover rate of the ladle, the ladle slag line bricks are not repaired in time after being etched, or the standard use is reduced, which greatly increases the probability of ladle slagging. Ladle slag line bricks have poor quality, poor corrosion resistance, poor permeability resistance, and quality problems such as cracks, which accelerate the erosion of the ladle slag line bricks and accelerate the slagging of the ladle slag line.

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.

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Design and Application of Tapping Sleeve Brick

The tapping sleeve brick is the channel for the molten steel from converter to the ladle. It directly contacts with the molten steel and its life directly affects the steel making rhythm of the converter. From the structure, tapping sleeve bricks are divided into monolithic sleeve brick and split sleeve brick. The monolithic sleeve brick is generally used isostatic compression molding, split sleeve brick is used machine pressure molding.

Whether it is monolithic or split type, the inner holes is a circular structure of the through-hole. The hole size according to tapping time, and the wall thickness is generally 50-100mm. The hole shape is divided into straight and trumpet-shaped. Experiments show that the trumpet-shaped hole and the circular inlet shape, the tapping speed is faster, which means that the interference between the molten steel and the tap hole is weakened and the water flow is relatively stable, shortens the tapping time. There have many kinds of refractory products in our factory.

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.

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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.
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The specification of refractory bricks

Refractory firebrick is aluminum silicate refractory material, with A12O3 and SiO2 as its basic chemical composition, according to A12O3 and SiO2 content ratio, this type of refractory material is divided into three kinds: semi-silica brick (A12O3 15 ~ 30%), Clay brick (A12O3 30 ~ 48%), high alumina brick (A12O3> 48%). Clay brick is one of the largest and most widely used, the output of the total output of refractory materials of about 60 to 70%.
Refractory brick raw material is calcined after A12O3 + TiO2 content of not less than 30% of the china refractory brick, alkali and alkaline earth metal oxides and iron oxide content should be as little as possible, generally about 5-7%. Fire resistance of refractory clay must be no less than 1580 ℃. Clay raw materials after calcination, broken, ingredients (adding soft clay as a binder), pressing molding, drying, firing and other processes, you can get finished refractory bricks.
Refractory firebrick is weak acid refractory. As the chemical composition of the larger fluctuations in the production methods are different, the difference in firing temperature, so that the nature of clay brick changes. Ordinary clay brick according to the composition of the content of Al2O3 is divided into (NZ) a 40, (NZ) a 35, (NZ) a 30 three grades. The refractory degree of clay brick is above 1600 ℃, but the starting softening temperature is very low, only 1250 ~ 1300 ℃, and the load softening start temperature and the final temperature (fflJ40% deformation temperature) interval is large, this interval is about 200 ~ 250 ℃. Clay brick is very important in this nature, it makes the clay brick, although not too high refractoriness, but still can be applied to many high-temperature thermal equipment. Clay brick quenching and cooling is better, at 850 ℃ water cooling up to 10 to 25 times. Clay brick can resist weak acid slag erosion, little resistance to alkaline slag, increase the content of Al2O3, can improve the ability of alkali-resistant slag.
The refractory firebrick is rich in raw materials, the manufacturing process is simple and the cost is the lowest, and it is widely used in the furnace, flue, chimney, waste heat utilization device and burner of various heating furnaces and heat treatment furnaces. Chinafirebrick 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.
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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 brick china 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.

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The specification of firebrick in gasification furnace

Clay refractory bricks as an important refractory, changxing refractory to tell you about clay refractory in the gasifier in the standard use, there have been some problems should be avoided?

Clay refractory bricks in the operation of the gasifier has also occurred in the oxygen load fluctuations, and sometimes oxygen regulator valve will cause changes in oxygen load, and sometimes large particles will suddenly stuck high pressure coal slurry pump valve, coal slurry flow suddenly caused by Oxygen is relatively excessive. Oxygen fluctuates directly after the furnace temperature fluctuations, oxygen fluctuations in the range of sometimes 500m3 ~ 600m3, the maximum reached over 1000m3 or so. Oxygen suddenly rose, resulting in a sudden rise in furnace temperature, will suddenly burn high temperature thermocouple, this situation on the clay refractory brick is great, should try to avoid. First of all, we all know that the furnace temperature on the life of the refractory lining is very important, so to strictly control not overheating. Under the normal production conditions, the clay refractory brick surface has a layer of cinder layer, in fact, slag is dynamic, low temperature slag thicker, high temperature slag thinner, suitable thick slag layer can slow down the high temperature gas and slag Scouring. The same time as
The above is on the clay refractory fire bricks in the gasifier in the standard use, hoping to bring you help. Is a professional refractory production enterprises, the company qualified, advanced equipment and experienced. Product quality is strict checks, deep products of our customers love. At present, the company produced refractory products are shaped bricks, high alumina brick, square brick, clay refractory bricks, we warmly welcome the needs of customers to visit the company to discuss and seek common development.

There have many refractory news and refractory products information on web. You can read more refractory products and know more refractory materials information.Because our website has many kinds of refractory news and industry news. what's more ,you can know more kinds of refractory information from our website. Chinafirebrick provides refractory products, calcium silicate products, castable & mortar, fire brick, 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.

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The application and features of High Alumina Brick

Clay refractory brick is Al2O3 content of 30% to 40% of aluminum silicate material of clay products. Clay brick is 50% soft clay and 50% hard clay clinker, according to a certain size requirements for ingredients, after molding, drying, in the 1300 ~ 1400 ℃ high temperature firing. The mineral composition of clay brick is mainly kaolinite (Al2O3 · 2SiO2 · 2H2O) and 6% ~ 7% impurities (potassium, sodium, calcium, titanium, iron oxide). stick
The calcination process of tiles is mainly due to the process of crystallization of kaolinite (3Al2O3 · 2SiO2). The SiO2 and Al2O3 in the clay brick form an eutectic and low melting point silicate with the impurity surrounding the mullite crystals during the firing process.
Clay refractory bricks are weak acid refractory products, can resist acid slag and acid gas erosion, resistance to alkaline substances slightly worse. Clay brick thermal performance is good, resistance to rapid cooling hot.
Clay refractory firebrick degree and silica brick comparable, up to 1690 ~ 1730 ℃, but the load softening temperature is lower than the silica brick 200 ℃. Because the clay brick contains high refractory mullite crystals, but also contains nearly half of the low melting point amorphous glass phase.
In the temperature range of 0 ~ 1000 ℃, the volume of clay brick with the temperature rise and uniform expansion, linear expansion curve is similar to a straight line, linear expansion rate of 0.6% to 0.7%, only half of the silicon brick. When the temperature reaches 1200 ℃ and then continue to heat up, the volume will start to shrink from the maximum expansion. The residual shrinkage of the clay brick leads to the cracking of the masonry gray seam, which is a major drawback of the clay brick. When the temperature exceeds 1200 ℃, the clay in the low melting point material gradually melted, because the particles by the surface tension and rely on each other very tight, resulting in volume shrinkage.
As the clay refractory fire brick load softening temperature is low, at high temperature shrinkage, thermal conductivity than silica brick 15% to 20%, mechanical strength is also worse than the silicon brick, so clay can only be used for the secondary parts of the coke oven , Such as regenerative room wall, small flue lining brick and regenerator lattice brick, door lining brick, roof and riser lining brick.
Xinmi Changxing furnace refractory Tips: You may also on the refractory bricks, refractory manufacturers, refractory bricks prices, high alumina refractory bricks, Magnesia Carbon Brick, clay refractory bricks, Henan refractory brick factory, Xinwei refractory brick factory, Xinwei refractory brick factory Interested if you have any need please call our service hotline.
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The different uses of high alumina bricks

Clay refractory brick is Al2O3 content of 30% to 40% of aluminum silicate material of clay products. Clay brick is 50% soft clay and 50% hard clay clinker, according to a certain size requirements for ingredients, after molding, drying, in the 1300 ~ 1400 ℃ high temperature firing. The mineral composition of clay brick is mainly kaolinite (Al2O3 · 2SiO2 · 2H2O) and 6% ~ 7% impurities (potassium, sodium, calcium, titanium, iron oxide). stick
The calcination process of tiles is mainly due to the process of crystallization of kaolinite (3Al2O3 · 2SiO2). The SiO2 and Al2O3 in the clay brick form an eutectic and low melting point silicate with the impurity surrounding the mullite crystals during the firing process.

Clay refractory bricks are weak acid refractory products, can resist acid slag and acid gas erosion, resistance to alkaline substances slightly worse. Clay brick thermal performance is good, resistance to rapid cooling hot.

Clay refractory firebrick degree and silica brick comparable, up to 1690 ~ 1730 ℃, but the load softening temperature is lower than the silica brick 200 ℃. Because the clay brick contains high refractory mullite crystals, but also contains nearly half of the low melting point amorphous glass phase.

In the temperature range of 0 ~ 1000 ℃, the volume of clay brick with the temperature rise and uniform expansion, linear expansion curve is similar to a straight line, linear expansion rate of 0.6% to 0.7%, only half of the silicon brick. When the temperature reaches 1200 ℃ and then continue to heat up, the volume will start to shrink from the maximum expansion. The residual shrinkage of the clay brick leads to the cracking of the masonry gray seam, which is a major drawback of the clay brick. When the temperature exceeds 1200 ℃, the clay in the low melting point material gradually melted, because the particles by the surface tension and rely on each other very tight, resulting in volume shrinkage.

As the clay refractory fire brick load softening temperature is low, at high temperature shrinkage, thermal conductivity than silica brick 15% to 20%, mechanical strength is also worse than the silicon brick, so clay can only be used for the secondary parts of the coke oven , Such as regenerative room wall, small flue lining brick and regenerator lattice brick, door lining brick, roof and riser lining brick.
Xinmi Changxing furnace refractory Tips: You may also on the refractory bricks, refractory manufacturers, refractory bricks prices, high alumina refractory bricks, Magnesia Carbon Brick, clay refractory bricks, Henan refractory brick factory, Xinwei refractory brick factory, Xinwei refractory brick factory Interested if you have any need please call our service hotline.

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International standard for the volume density of firebrick

China refractory brick is divided into ordinary clay refractory bricks, dense clay refractory bricks, high-density clay refractory bricks, silica bricks, magnesia carbon bricks, aluminum-magnesium carbon brick, the bulk density of different, some soft, and some hard.

According to the different types of raw materials used in the production of refractory bricks, the density of the refractory bricks china is different. The general refractory is measured at the factory before the bulk density and bulk density: the ratio of the mass of the dried product to its total volume, expressed in g / cm3 , The bulk density index is the main indicator of the degree of product density, high density, you can reduce the external slag and other invasive.

Ordinary clay refractory bricks are generally 1.8 ~ 2.0g / cm3, dense clay refractory bricks are generally 2.05 ~ 2.20g / cm3, high dense clay refractory bricks are generally 2.25 ~ 2.30g / cm3, silica bricks are generally 1.80 ~ 1.95g / cm3 , Magnesium bricks are generally 2.60 ~ 2.70g / cm3, aluminum and magnesium.
Carbon brick is generally 2.90 ~ 3.00g / cm3, the product of the bulk density index is the product volume and the composition of the comprehensive reflection of the composition of minerals, because it is easier to measure, in production is usually used as a means to determine the degree of sintering products.

We are mainly engaged in the production of refractory bricks, high alumina bricks, high alumina refractory bricks, alkali-resistant bricks, clay tiles, insulation bricks, light high alumina bricks, low creep high alumina bricks, Brick, high aluminum lightweight insulation brick, clay insulation brick, if you have any need please call our service hotline.

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Thermal conductivity of refractory fire bricks

Chinafirebrick provides refractory products, magnesia carbon brick， calcium silicate products, castable & mortar, fire brick china, ladle & tundish nozzle, ceramic fiber with high quality for you. Refractory fire bricks rely on convection and steady state heat transfer, in the middle of the high temperature furnace if there are two refractory bricks, and there are two different temperatures there is a temperature difference. There will be heat transfer process we call heat transfer.

Refractory tiles convection heat is due to the movement of the internal particles of the fluid, the heat of the refractory brick from one to another. In the furnace refractory tiles heat transfer often encountered, when the fluid and refractory brick wall contact with the heat to the refractory wall or heat from the wall to the phenomenon of fluid.

Conduction heat transfer, also known as thermal conductivity, thermal conductivity is dependent on the thermal movement of micro-particles and the heat from the refractory high temperature zone to the low temperature area, or from the high temperature refractory brick to contact with the low temperature refractory brick process. In the hot environment, the temperature field of the temperature distribution in the interior of the refractory bricks is changed from time to time to the steady state temperature field.

Heat transfer rate: refers to the unit time through the heat transfer surface heat transfer.Heat flux: refers to the unit time through the unit heat transfer surface heat. Heat flux, also known as heat density.

Steady state heat transfer
The heat transfer process at which the temperature of the points in the heat transfer system varies only with the position and does not change with time. The process of steady state heat transfer is characterized by a constant heat transfer rate through the heat transfer surface.

Non - steady state heat transfer
In the non-steady state heat transfer system, the temperature along the points not only changes with the position, but also changes with time. In general, the heat transfer process of the intermittent production operation is non-steady state heat transfer.
There have many refractory news and refractory products information on web. You can read more refractory products and know more refractory materials information. Because our website has many kinds of refractory news and industry news. what's more ,you can know more kinds of refractory information from our website.
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The application and requirements of refractory brick masonry

China refractory brick masonry construction, first of all, clear the construction tasks; secondly, do the "three check", that check personnel, check the material, check the scene; then, ready, remove the hidden dangers, reduce the problem; finally, In order to cope with possible accidents.

1. Careful analysis of drawings, a clear construction tasks, understand the design intent, to clarify the design requirements of each part and the main points.

2. Visit the design side, the supply side, the construction side, the application side of the leadership, to clarify the parties, the parties within the working relationship and organizational relations, the implementation of their respective responsibilities, clear what problems, who should solve. Changxing refractory to provide you with technical solutions.

3. Check the refractory raw materials, construction tools and auxiliary facilities into the site to confirm whether the varieties, specifications, quantity and quality meet the construction requirements. Whether the personnel and organizations involved in the construction meet the intended requirements.
Chinafirebrick provides refractory products, calcium silicate products, castable & mortar, fire brick China, ladle & tundish nozzle, ceramic fiber with high quality for you.There have many refractory news and refractory products information on web. You can read more refractory products and know more refractory materials information.
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Basic requirements of refractory brick masonry

Refractory fire brick masonry construction, first of all, clear the construction tasks; secondly, do the "three check", that check personnel, check the material, check the scene; then, ready, remove the hidden dangers, reduce the problem; finally, In order to cope with possible accidents.

1.Careful analysis of drawings, a clear construction tasks, understand the design intent, to clarify the design requirements of each part and the main points.

2.Visit the design side, the supply side, the construction side, the application side of the leadership, to clarify the parties, the parties within the working relationship and organizational relations, the implementation of their respective responsibilities, clear what problems, who should solve. Changxing refractory to provide you with technical solutions.

3.Check the refractory raw materials, construction tools and auxiliary facilities into the site to confirm whether the varieties, specifications, quantity and quality meet the construction requirements. Whether the personnel and organizations involved in the construction meet the intended requirements.
Chinafirebrick provides refractory products, calcium silicate products, castable & mortar, fire brick China, ladle & tundish nozzle, ceramic fiber with high quality for you.There have many refractory news and refractory products information on web. You can read more refractory products and know more refractory materials information.
Article Source: China refractory fire bricks
Company name: Henan Xinmi Changxing Refractory Materials Co.,Ltd
Email: sales1@chinafirebrick.com
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The different types of refractory fire bricks

1.Disperse type. There have many refractory news and refractory products information on our factory. Such as Ladle Permeable Brick, fire bricks and other refractory products. You can read more refractory products and know more refractory materials information. It is composed of grains which are used for adjusting the purge plug, which makes it highly permeable. But the permeability can not be manually controlled, it is with low strength and service life.

2.Slit type. The air gap is formed by the septas between the micro dense sheets. Air is blown into refining ladle through these gaps. The adjustability of blowing capacity is better than disperse type but still not easy to control.

3.Aligned pore type. It is produced by putting different numbers of thin stainless steel pipes inside. The air volume and distribution can be manually controlled by this type of purge plug, it is also with higher service life.

4.Maze type. It is produced by putting a netted air supplying tunnel in the fine and closely woven base. Air volume can be easily controlled. Even if one pass is blocked by the penetrated molten steel, air still can go into the refining ladle through other passes.

5.Maze combined with aligned pore type. It combines the advantages of both aligned pore type and maze type, thus offers better performaces.

There have many kinds of refractory products in our factory. What's more, there have many kinds of refractory fire bricks and other refractory products in our factory. Welcome to view our factory anytime.
Article Source: Different types of purge plug for refining ladle
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Come to know the Types of refractory fire bricks

Refractory fire brick manufacturers said that this refractory , high strength, simple construction, wide range of uses, easy to draw, suitable for a variety of industrial furnace masonry, its use and use of different temperatures.
1. Physical and chemical indicators of ordinary refractories clay brick, the size of the allowable deviation and shape products cross-section, should meet the specifications.
Ordinary refractory clay brick for the general furnace refractory masonry. Lining materials, furnace wall, bottom, flue and other operating temperature below 1250 ℃. Combustion chamber parts, allowing the use of more than 1400 ℃.
2. High aluminum brick physical and chemical indicators, product size, allowable deviation, etc., should comply with the provisions of the specification. High alumina bricks are used in general furnace high temperature, wear resistant areas or larger load masonry, burner bricks and special requirements of the masonry. The high temperature zone of the combustion chamber of the dome, allowing the use of temperature 1300 ~ 1650 ℃.
3. Lightweight clay brick physical and chemical indicators, product size allowable deviation and shape products cross-section requirements, should meet the specifications. Lightweight refractory clay brick, as not from the high temperature slag and erosive gas erosion of the furnace lining, according to the different capacity, the use of temperature between 1150 ~ 1400 ℃.
Zhengzhou Changxing furnace refractory material Tips: You may also on the refractory bricks, refractory manufacturers, refractory bricks prices, high alumina refractory bricks, clay refractory bricks, Henan refractory brick factory, Zhengzhou refractory brick factory, Xinmi refractory brick factory .Welcome to view our web to know more kinds of refractory products .

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Thermal conductivity of refractory bricks

The thermal conductivity of refractory fire bricks is represented by the thermal conductivity that has the ability to transfer heat. Thermal conductivity represents the amount of heat per in unit area, unit time and unit temperature gradient in the energy transfer process.
At 1000 ℃The thermal conductivity of various refractory bricks rate as shown below. The thermal conductivity of different materials is often very different. At normal temperature, the thermal conductivity of various refractory bricks can be from a few percent to several tens (w／(m·℃), which is nearly a thousand times lowst than the highest value. As the temperature rises, although the difference between the thermal conductivity of various refractory bricks tends to decrease, but the difference is still large. Such as 1000 degrees centigrade, the thermal conductivity of lightweight silica is only about 0.35W, recrystallized silicon carbide products is about 17.5W／(m·℃), graphite can be up to 35W / (m·℃).
In addition to temperature, the thermal conductivity of refractory bricks?is closely related to its chemical composition and structure. When refractory bricks?are made of crystal, the properties of crystal have obvious influence on thermal conductivity. As we all know, the thermal conductivity of inorganic nonmetallic materials is generally much lower than that of metal. Because inorganic nonmetallic materials are different from metals with metal bonds, there are very few free electrons. The thermal conductivity caused by free electrons in this material is extremely limited, and the lattice vibration is mainly deviated from the degree of resonance. The greater the degree of deviation from the resonance, the thermal conductivity is smaller. The degree of lattice vibration deviation increases with the difference in the molar mass of the constituent components, so the thermal conductivity of the element is the largest. (So the thermal conductivity of graphite is relatively large).
China refractory bricks have a complex structure of crystals, the thermal radiation of the lattice is greater and the thermal conductivity is smaller, such as MgO, A12O3 and MgAl2O4 Such as MgO, A12O3 and MgAl2O4 are equiaxed, but the structure of MgAl2O4 is complex and the thermal conductivity is low. Non-coherent crystals, in the direction of dense particles along the crystal, thermal conductivity is larger. The quartz along the C axis has a dense accumulation of particles, and its thermal conductivity (13.6W／(m·℃))?is about twice as high as that of the C axis. The layered structure of graphite, the thermal conductivity parallel to the direction of the level of about 4 times in the direction perpendicular to plane direction.
If the crystal is defective, the formation of substitutional solid solution, because the rules of the crystal structure of the destruction caused by thermal scattering phenomenon, resulting in a decrease in thermal conductivity. Other crystal defects such as vacancies, dislocations and so on, also has a similar effect. Due to the thermal scattering of the grain boundary, the thermal conductivity of the polycrystalline material is lower than that of the single crystal. The material of fine grain is lower than that of coarse grain. The refractory raw material contains impurities, the thermal conductivity is lowered due to the scattering effect.

When refractory bricks contain glass phase, due to the amorphous structure of the disorder, the probability of collision between atoms. ?So compared with the crystal, thermal conductivity is low.?When the refractory brick contains pores, because the thermal conductivity of the gas is smaller than the solid, so with the increase in porosity, the thermal conductivity of the material decreases. This is the basic reason for the low thermal conductivity of porous materials. There have many kinds of refractory products in our factory. Such as Taphole Brick, fire bricks for sale, refractory nozzle and other refractory products.
Article source: Thermal conductivity of refractory bricks

Global refractory market will reach 42.5 million tons in 2022

Emerging market infrastructure drives the recovery of the steel and cement industry and then drives the?refractory?industry slow growth. It is expected that by 2022, the global refractory market will reach 42.5 million tons. Despite China's economic slowdown, but China as a refractory power consumption, still occupies a pivotal position. Developed countries, such as the United States, Japan and Europe are very different, they use more efficient advanced production technology.

Although the current steel industry is still the main application areas of refractory industry. But the next few years, non-ferrous metals and minerals and minerals will become the mainstay of the refractory industry. Unstable castables and preforms will receive increasing attention due to their high performance and flexibility. Zirconium / zirconia, silicon carbide, ultra-high alumina and other special?refractory materials?will become increasingly popular because of their high performance applications in special fields.
Article source: Global refractory market will reach 42.5 million tons in 2022