Development Of Refractory Materials

First of all, refractory material is a kind of inorganic nonmetallic material with the refractoriness no less than 1580℃. Refractory generally refers to the refractory cone sample in the case of no load, resistance to high temperature without softening the melting Celsius temperature. As a necessity of industrial basic materials. Refractory has been widely used in steel, metallurgy, chemical industry, petroleum, machinery manufacturing, electricity, power and other industrial fields.

The current refractory technology is in accordance with the development needs of modern industry and industrial intelligent manufacturing, through physical research, chemical analysis, material design, material processing, test and a series of research process, to create a new refractory technology to meet the needs of various industries.

The production process of refractory materials is different according to the density and shape of the products, including sintering method, melting casting method and melting spray blowing method. However, with the continuous innovation and implementation of new refractory production, there will be more and more suitable for the new refractory production process in the production process. But pay more attention to energy saving, low carbon and environmental protection.

Refractory products mainly refer to refractory materials with high strength, high hardness, high temperature resistance, wear resistance, corrosion resistance and other performance requirements. It is used in steel, nonferrous metal, glass, cement, ceramics, petrochemical, machinery, boiler, light industry, electric power and other fields, and also plays an irreplaceable important role in the development of high-temperature industrial production.

At present, with the continuous development of high and new technology as the basis of high and new technology and the forerunner of refractory material and application range is gradually becomes more extensive, besides should outside the industry, refractory materials has been gradually extended to the electronic information, new energy, ecological environment, biological medicine, waste treatment, new buildings and military industry and other major fields.

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High Alumina Cement Supplier

High alumina cement and Portland cement are hydraulic cement, the main mineral composition of the former is calcium aluminate, the main mineral composition of the latter is calcium silicate, because of the different mineral composition, the characteristics of cement is not the same.

The main mineral of high alumina cement is mono-calcium aluminate (CA), and the secondary mineral is mono-calcium dialuminate (CA2). The reaction with water can be expressed in the following formula: the hydration products of high-alumina cement at room temperature, CAH10 and C2AH8, are both metastable products. When the temperature exceeds 35℃, they will transform into stable C3AH6, during this crystalline transformation, the strength decreases.

Due to the high alumina cement hydration products don't appear free Ca (OH2, also don't like C2S minerals exist in the Portland cement, when as the combination of the refractory concrete agent accordingly, will not happen such as Portland cement in the process of repeated heating and cooling for CaO and Ca (OH2 repeatedly to form, and beta of polymorphic transformation of C2S, the refractory concrete volume is not stable. And high alumina cement has early strength, in the kiln construction, can shorten the curing period as far as possible, that is, the so-called "one day concrete", so high alumina cement is widely used in the refractory industry.

One of the notable characteristics of high alumina cement is that it can accelerate the setting time of Portland cement, accelerate the strength and relieve the heat of hydration. By carefully choosing the dosage of high alumina cement, the mixture with Portland cement can obtain satisfactory hydration performance, which not only obtains high early strength, but also retains good long-term strength.

High Alumina Cement Main Application

1. Preparation of amorphous refractory.

2. Preparation of gypsum bauxite expansion cement, self - stress cement and other special purpose cement.

3. Projects with special needs such as rush construction, rush repair, resistance to sulfate erosion and winter construction.

Zhengzhou Rongsheng Kiln Refractory Co.,Ltd. is professional refractory material manufacturer, refractory products of high quality, reasonable price, is worthy of customer trust quality products. Welcome to consult purchasing.

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High Alumina Cement Supplier

High alumina cement is mainly based on bauxite and limestone as raw materials, calcinated calcium aluminate as the main component, alumina content of about 50% of the clinker. High alumina cement is usually yellow or brown, there are also gray.

The main mineral components of this series of refractory cement are CA and other aluminates, and a small amount of dicalcium silicate. Its density and packing density is close to that of ordinary Portland cement. Its fineness is specific surface area ≥300m2/kg or 45 m sieve residue ≤20%. High-alumina cement is divided into ca-50, ca-60, ca-70 and ca-80. The setting time and strength of each type of cement shall not be lower than the standard.

High alumina refractory cement sets fast. The intensity can reach more than 80% of the intensity, mainly used for urgent projects such as national defense, roads and special rush repair works.

Under the condition of common hardening, high alumina cement has strong resistance to sulfate corrosion because the cement stone does not contain tricalcium aluminate and calcium hydroxide, and the density is larger. It also has a high heat resistance. Such as the use of refractory coarse and fine aggregate (such as chromite, etc.) can be made of use temperature up to 1300 ~ 1400℃ heat resistant concrete.

High Alumina Cement Application

1. For the preparation of amorphous refractory materials;

2. With refractory coarse and fine aggregate (such as chromite, etc.) can be made into heat resistant concrete;

3. For urgent projects；

4. Engineering for resistance to sulfate corrosion and engineering for winter construction.

Zhengzhou Rongsheng Kiln Refractory Co.,Ltd. is a professional refractory manufacturers, we have a complete, scientific quality management system. Welcome to consult purchasing.

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Refractory Mortar Manufacturing

Refractory mortar is mainly composed of refractory powder, binder and admixture. Almost all refractory materials can be made into powder used to prepare refractory mortar. Refractory clinker powder with an appropriate amount of plastic clay as a binder and plastic agent and made of ordinary refractory mortar, its strength at room temperature is low, high temperature ceramic bonding has a higher strength. It is called chemical bond refractory to use hydraulic, gas or thermal hard binding material as the binding agent.

The size of refractory mortar varies according to the use requirements, its limit size is generally less than 1mm, some less than 0.5mm or more thin.

Refractory Mortar Characteristics

1. Good plasticity and convenient construction;

2. Strong bond strength and corrosion resistance;

3. High fireproof, up to 1550±50;

4. Good slag penetration resis

Refractory mortar manufacturing is mainly used in coke oven, glass kiln, blast furnace hot air furnace, other industrial kiln. Widely used in metallurgy, building materials, machinery, petrochemical, glass, boiler, electricity, steel, cement and so on.

This series of refractories is a kind of fire resistant special mortar which is composed of high temperature resistant inorganic refractories. Fire resistance, and oil resistance, salt water resistance, corrosion resistance, can prevent smoke, do not produce droplets, site mixing water can be applied, simple and convenient.

We are fully qualified and certified refractory manufacturers, refractory products exported to many countries and regions in the world, and many customers to reach friendly relations of cooperation, customers have been praised and trusted. Welcome to come to consult the procurement of refractory materials, we will be dedicated to your service.

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Development Prospect Of Lightweight Insulating Castable

For many industries, castable is often used, so it is still in high demand. The superior performance of insulation castable has been well received by many customers in the industry. So, how the future development of lightweight insulation castable, we will explain to you.

With the rapid development of lightweight insulating castable, the market demand is constantly increasing, but this does not mean that the quality of refractory products can not, but with the increase of varieties, the quality of products also increased, many new refractory raw materials have been developed. Our company is a very advanced technology enterprises, years of production experience, is worthy of the people's trust, is also very quality. If you want to buy high quality refractory castable products, you are welcome to contact us.

Now, the market for lightweight insulation castables is very good, so it will be a very promising market, when people focus on industry and enterprise products, we will get more consumer trust.

Lightweight insulation materials by heat preservation light aggregate and powder, binder and admixture. Generally speaking, the volume density of castable is lower than 1800 kg per cubic meter although it is difficult to treat, or its total porosity is greater than 45%, the linear change to heating less than 1.5% is called light insulation material castable.

Lightweight insulation castable has the characteristics of low volume density, low thermal conductivity and good thermal insulation performance. There are many kinds of lightweight insulation castable, generally speaking, it can be classified by lightweight aggregate varieties, production methods.

In the past, the lightweight insulation castable was used to cast the furnace with a temperature of 1000℃ above the insulation layer, which could not directly contact the flame. Otherwise, light insulation castables can now be used in heating furnaces at temperatures below 1800 ° c, and some castables can be used for working linings.

What is the development prospect of lightweight insulation castable? I'm sure you already know that. Lightweight insulation castable has been widely used in industrial furnaces and thermal equipment industry, the effect is also very good. Nowadays, the manufacturer that produces fireproof material also has a lot of, accordingly, when everybody is buying, must choose the manufacturer that the product quality assures a value to trust.

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High Quality Zirconia Brick For Sale

Zirconium bricks are generally pressed semi-dry and calcined at 1600℃. It is usually quadrature columnar, the softening temperature under load is greater than 1550℃, the melting point is generally 2430℃, and the apparent porosity is 0%~18%. This type of refractory brick is mainly used for lining of steel ladle and sizing nozzle for continuous steel injection.

Zirconium bricks manufacturing has high temperature resistance, good thermal shock resistance, slag and glass corrosion resistance and other excellent properties. It is stable in oxidizing atmosphere and does not react with molten metal.

It is important to note, that when the zirconium is heated to a certain temperature, it can decompose into cryptocrystalline ZrO2 and amorphous SiO2. Because of the purity of zirconium and the impurity, the size of raw material and the different holding time, the decomposition temperature of zirconium is not the same. The decomposition temperature ranges from 1540 ℃ to 2000℃. Zirconium was heated for 2h at 1600℃, and only a small amount of zirconium was decomposed. When heated for 2h at 1750℃, the decomposition rate of zirconium is 50%. When heated to 1900℃ ~ 2000℃, the decomposition rate can reach 100%. The presence of impurities such as Al2O3 CaO reduces the decomposition temperature of zirconium.

Therefore, when preparing zirconium clinker, its pre-firing temperature must be lower than the decomposition temperature of zirconium (1540℃).

So the manufacturer in the production of zirconium brick, must choose the zirconium concentrate as raw material after mineral concentration. The raw material has passed the radioactive strength test, if the specific radioactive strength exceeds the relevant provisions of the state, the corresponding protective measures shall be taken.

High quality zirconium bricks sold can be used as glass pool kiln bottom large brick and superstructure material. In the field of metallurgy, zirconium brick can be used as steel drum lining, continuous casting water mouth.

We are a high quality refractory manufacturers, committed to the production of a variety of high quality refractory products, with more than 20 years of production experience, you are welcome to come to consult and purchase, we will be dedicated to your service.

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High Alumina Bricks Feature

High alumina brick is a commonly used refractory brick AL2O3 content more than 48% of aluminum silicate refractory brick materials collectively. It USES high bauxite as aggregate and can be produced by chemical bonding or sintering. The firing reaction is mainly the decomposition of kaolinite and bauxite and the secondary mullite process.

It is well known that high alumina brick is mainly used for lining of blast furnace, hot air furnace, electric furnace top, blast furnace, reverberatory furnace and rotary kiln. In addition, high alumina brick is also widely used as open hearth regenerator lattice brick, pouring system with the plug etc.

High aluminum brick molding drying, molding of the brick water content is generally above 3.5%, not immediately into the kiln firing, need to go through drying to reduce water. The drying system of the blank body varies with the different forming methods and the different single weight. The semi-dry forming billet should be dried in the tunnel dryer. The hot air temperature is 140~160℃, the exhaust gas temperature is 60~90℃, and the residual water of the billet should be less than 2%.

High Alumina Bricks Feature

1. Fire resistance. High alumina brick than clay brick and semi - silicon brick refractory are higher, up to 1750-1790 degrees, belongs to the advanced refractory.

2. Softening temperature under load. Because of the high Al2O3 in high aluminum, miscellaneous quality, form the fusible vitreous, less so refractoriness under load is higher than clay bricks, high aluminum refractoriness under load is in commonly 1420-1550 degrees of above. However, the softening temperature under load is still not as high as that of silicon brick because mullite crystals do not form reticular structure.

3. Good slag resistance. Al2O3 more this series of refractory brick, close to neutral refractory, slag resistance to acid and alkaline slag erosion, due to containing the SiO2, so the ability of resistance to basic slag than weak ability to resist acid slag.

4. Strong resistance to chemical attack. The corrosion resistance, oxidation and reduction reactions of high alumina refractory products to acid or alkaline slag and metal liquid are very good, and it is enhanced with the increase of Al2O3 content and the decrease of harmful impurities content.

In order to reduce the porosity and improve the quality of high alumina brick, the molding pressure must be increased. For ordinary high aluminum brick, forming pressure should reach 137MP: degree high aluminum brick forming pressure should be in 176~215MP range. That is to say, only the use of 250t more than the grinding press brick machine molding, to achieve such an effect.

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Classification Of Refractory Brick

According to the different composition of firebrick, it can be divided into five categories, namely: si-al series firebrick, alkaline series firebrick, containing carbon firebrick, containing zirconium firebrick, insulation refractory brick. Any furnace is not built with one firebrick, but with a combination of different refractory bricks. Below we will make a detailed introduction to the composition of these five kinds of firebrick.

1. Si - al Series Refractory Brick

（1）Silicon brick, it is to point to contain SiO293% above firebrick, it is the main breed of acid firebrick. It is mainly used for laying coke oven, but also for various glass, ceramic, carbon calciner, firebrick thermal kiln vault and other load-bearing parts, in the hot air furnace high temperature load-bearing parts are also used, but not in 600℃ and temperature fluctuations of thermal equipment.

（2）Clay brick, clay brick is mainly composed of mullite (25% ~ 50%), glass phase (25% ~ 60%) and quartz and quartz (up to 30%). Usually with hard clay as raw material, in advance calcining mature material, and then with soft clay, semi-dry or plastic molding, the temperature of 1300 ~ 1400 C fired clay brick products. It is the firebrick commonly used in blast furnace, hot air furnace, heating furnace, power boiler, lime kiln, rotary kiln, ceramic and firebrick firing kiln.

（3）The mineral composition of high alumina refractory brick is corundum, mullite and glass phase, and its content depends on the AL2O3/ SiO2 ratio and the type and amount of impurities, which can be classified according to the AL2O3 content of firebrick. It is produced by sintering. But the product still has melt - cast brick, melt - grain brick, do not burn brick and amorphous firebrick. High alumina firebrick is widely used in iron and steel industry, non-ferrous metal industry and other industries.

（4）Corundum brick is a kind of refractory brick with AL2O3 content not less than 90% and with corundum as the main phase, which can be divided into sintered corundum brick and electrofused corundum brick.

2. Alkaline Series Refractory Brick

（1）Magnesia firebrick refers to firebrick with magnesite as raw material, with magnesium stone as the main crystal phase, MgO content in 80% ~ 85% above. Its products are divided into metallurgical magnesia and magnesium products two categories. Mainly used in open hearth furnace, oxygen converter, electric furnace and nonferrous metal smelting.

（2）Dolomite brick is an alkaline firebrick made from dolomite. It is widely used in basic converter and can be used as the lining of some refining bags.

（3）Magnesite olivine firebrick is mainly composed of magnesite olivine 2MgO·SiO2. It is mainly used for lattice brick of open hearth regenerator, ingot brick, heating furnace bottom and copper smelting furnace.

3. Carbon Refractory Brick

（1）Carbon brick, is the carbon material as the main raw material, adding the right amount of binder made of high temperature resistant neutral refractory brick products. Carbon brick is widely used to build the bottom, hearth, belly and underside of blast furnace.

（2）Graphite refractory products are refractory materials made from natural graphite and clay as binder. This kind of products have graphite clay crucible, distillation tank, cast steel plug brick, water brick and steel barrel lining brick.

（3）SiC refractory, is silicon carbide (SiC) as raw material production of advanced refractory. Its good wear resistance and corrosion resistance, high temperature strength, high thermal conductivity, small coefficient of linear expansion, good thermal shock resistance.

4. Zirconium Refractory Brick

（1）Zirconium refractory bricks are highly resistant to acid slag and glass and are widely used in severely damaged parts of the glass kiln where the most active glass is smelted. Zirconium refractory also has the property of not being penetrated by metal aluminum, aluminum oxide and its slag.

（2）AZS electrofused brick, also known as electrofused zirconium corundum brick, with the development of the glass industry, AZS electrofused brick has become a key part of the glass kiln must be refractory. It is highly resistant to the erosion of glass solution.

（3）Zirconium mullite electrofused brick is characterized by compact crystal structure, high softening temperature under load, good thermal shock resistance, high mechanical strength at room temperature and high temperature, good wear resistance, good thermal conductivity, and excellent resistance to slag erosion. This kind of product is widely used in metallurgical heating furnace, soaking furnace, discharge port of calcium carbide furnace and wall of glass melting furnace.

5. Insulation Refractory Brick

（1）High aluminum insulation refractory brick. With bauxite as the main AL2O3 content of not less than 48% thermal insulation light firebrick. Its production process uses the foam method, also may use the burn-out addition method. High aluminum thermal insulation lightweight refractory brick can be used for masonry thermal insulation layer.

（2）Mullite insulation refractory brick can directly contact the flame, with high temperature resistance, high strength, energy saving and other characteristics. Suitable for lining of pyrolysis furnace, hot air furnace, ceramic roller kiln, electric porcelain drawer kiln and various resistance furnace.

（3）Clay insulation refractory brick is made of refractory clay with AL2O3 content of 30% ~ 48%. Its production process adopts burn - up and character method and foam method.

We are a professional refractory material manufacturers, production experience, product variety, stable and reliable quality, you are welcome to come to consult and purchase.

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High Quality Silicon Brick Manufacturer

The material of silicon brick is mainly made of quartzite and then fired at high temperature with a small amount of mineralization agent. The mineral composition of Al2O3 is mainly composed of phosphorous quartz, quartzite and vitreous complex structure formed by high temperature, and the content of Al2O3 is more than 93%.

Refractory silica brick belongs to acid refractory material, which has a strong resistance to acid slag erosion, but it is easy to be destroyed by Al2O3 and other oxides when it is strongly eroded by alkaline slag, and has good resistivity to iCaO, FeO, Fe2O3 and other oxides.

The thermal conductivity of this series of refractories increases with the increase of working temperature, and there is no residual shrinkage. In the drying process, the volume of silica brick increases with the increase of temperature, and in the drying process, the maximum expansion of silica brick occurs between 100 ℃ and 300℃. The main reason is that four crystal transformation points (117℃, 163℃, 180~270℃ and 573℃) appear in SiO2 in the oven process, among which the volume expansion caused by quartz is the largest between 180 ℃ and 270℃.

It should be noted in the process of use of silicon brick, when its working temperature is lower than 600~700℃, the volume of silicon brick changes greatly, the performance of resistance to rapid cooling and rapid heating is poor, and the thermal stability is not good. If the coke oven works at this temperature for a long time, the masonry is easy to break.

Silicon Brick Application

It is mainly used for the partition wall of coking chamber and combustion chamber, regenerator and sediment chamber of steelmaking open hearth furnace, equalizing furnace, refractory of glass melting furnace and firing kiln of ceramics and other bearing parts of kiln furnace. Also used in hot air furnace high temperature bearing parts and acid open hearth furnace top etc.

Zhengzhou Rongsheng Kiln Refractory Co.,Ltd. is professional refractory material manufacturer, our production experience is rich, the product quality is superior, welcome everybody to come to consult purchase.

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High Quality Refractory Bricks For Sale

Refractory bricks for sale meaning are called a kind of shaped refractories which belong to one kind of refractories. 

Refractory brick is refractory material with certain shape and size. Their shape has standard rules, but also can be built and cut as necessary temporarily according to the need. Refractory bricks for sale are made form refractory clay or other refractory raw materials with the color light yellow or brown.

Refractory bricks for sale are commonly used in smelting furnace, resisting the high temperature of 1580-1770℃. Refractory bricks can be used as high temperature building materials and structural materials for building furnaces and various thermal equipment and can withstand physical and chemical changes as well as mechanical actions at high temperatures.

RS group is a professional refractory bricks manufacturer, and has been committed to the production of refractory materials for many years, with many customers to achieve friendly relations of cooperation.

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Performance of Insulation Refractory

Refractory fibre as a highly efficient heat preservation and heat insulation refractory material, has both the general fiber soft, the characteristics of high strength, can be processed into various products, such as blanket, cord, belt, carpet, etc., and has the performance of ordinary fibers have no part such as oxidation resistance, corrosion resistance, high temperature resistant, etc., to make up for a general refractory too brittle faults.

And refractory fiber volume density is small, usually 0.1~0.2g/cm3, is ordinary clay brick 1/20~1/10, light clay brick 1/10~1/5. Therefore, the use of refractory fiber instead of firebrick, can reduce the weight of furnace body, reduce the thickness of furnace wall. In addition, refractory fiber specific heat is low, only ordinary firebrick 1/72, light clay brick 1/42. Therefore, it is often used as intermittent kiln lining, which can significantly reduce heat storage loss, save fuel and increase heating rate. Refractory fiber products have been widely used in industrial kilns and have achieved obvious energy saving effect. For continuous operating furnace, the use of refractory fiber products can save energy of 3%~10%, for intermittent operating thermal equipment, the use of fiber refractory material energy saving is more obvious, energy saving up to 10%~30%, or even higher. The masonry method of refractory fiber products has great influence on its thermal insulation effect.

Adiabatic board is a kind of not to burn the product, by fireproof fiber material, fireproof raw material, union agent and admixture composition, is an important variety of heat preservation and heat insulation refractory material. According to the material, the insulation plate is divided into silica, magnesium, magnesium olivine, aluminum silicate and floating beads. This refractory material is characterized by low thermal conductivity, low density and good corrosion resistance. It is mainly used in ingot cap and continuous casting tundish, so it is called tundish adiabatic plate and cast mold adiabatic plate respectively. The insulation plate of tundish is divided into wall plate, bottom plate and impact plate.

Insulation refractory materials should be selected reasonably according to the purpose and requirements of energy saving, structural characteristics, working conditions and service life of furnace.

We are professional refractory material manufacturer, refractory products of all kinds, stable and reliable quality, you are welcome to consult and purchase.

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High Alumina Brick Performance

High alumina brick is mainly alumina content in the 48% above a kind of neutral refractory material. It is formed by calcining bauxite or other material with a higher alumina content.

This series of refractory brick mainly has high thermal stability, fire resistance can reach more than 1770℃, good slag resistance. Widely used in masonry steelmaking furnace, glass furnace, cement converter, etc.

High load soft, low creep high aluminum brick with high temperature creep, corrosion resistance, thermal shock stability, and other advantages, suitable for large and medium-sized hot air furnace. It provides a successful way for the high quality and high grade refractory materials for the new type hot air furnace.

Its fireproof is higher than the fireproof of clay brick and semisilicone brick, reach 1750~1790℃, belong to high-grade refractory. And, because Al2O3 in this series of refractory products is high, the impurity mass is less, the formation of fusible vitreous body is less, so the softening temperature under load is higher than that of clay brick.

High alumina refractory brick is mainly used for lining of blast furnace, hot air furnace, electric furnace roof, blast furnace, reverberatory furnace and rotary kiln. In addition, high alumina brick is also widely used as open hearth regenerative lattice brick, pouring system with plug head, nozzle brick.

RS group is a high quality refractory material manufacturer, we produce various types of refractory material, the product variety is complete, the quality is stable and reliable, exports to many countries and regions in the world, and many customers have reached a friendly relationship of cooperation. Welcome to have the refractory material demand of the user, come to contact us, we will provide you with the most suitable for your product solution.

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Corundum Refractory Bricks Manufacturing

As we know, Corundum brick is refractory material of which the main crystal phase is the corundum.

This series of refractory bricks belongs to neutral refractory with good chemical stability, which is resistant to erosion of the acid and alkali slag and solvent, as well as the other chemicals.

Corundum bricks manufacturing is excellent in abrasion resistance, oxidation resistance, and corrosion resistance. It has good cold compressive strength, about 340 MPa, and high refractoriness under load, which is about 1700℃. Zhengzhou Rongsheng Kiln Refractory Co.,Ltd. specialized in the production of refractory material, we are a professional manufacturer of refractory production and processing, I plant refractory bricks specifications complete, welcome to order.

The corundum refractory brick content of alumina is more than 90%, has a very high room temperature compressive strength, acid or alkaline slag, metal and glass liquid have a strong resistance.

Zhengzhou Rongsheng Kiln Refractory Co.,Ltd. is specializing in the production of all kinds of refractory products refractory manufacturers, I plant production of refractory types complete, stable and reliable quality, welcome to consult the procurement.

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