Nozzle,Tundish Nozzle,Long Nozzle,Tundish Long Nozzle,Alumnium Carbon Long Nozzle,Nozzle Refractory @en1.chinaelong.com

Based on function categories, the long nozzles manufactured by our company are classified into preheating nozzle, non-preheating nozzle, argon blowing nozzle and not argon blowing nozzle, and based on material quality, nozzles mainly classified into aluminum carbon, aluminum-zirconium carbon and aluminum-magnesia carbon. This product is provided with good liquid steel washing resistance performance and liquid steel erosion performance in the course of use, which can effectively prevent oxidation of air to liquid steel and its spatter.

Tundish Refractory,Monoblock Stopper,Tundish Monoblock Stopper Refractory at en1.chinaelong.com

According to the quality of the refractory materials, the monoblock stopper of our company can be classified into aluminum carbon, aluminum-zirconium carbon and aluminum-magnesia carbon. This product enjoys performances including favorable slag resistance, strong fracture resistance at normal temperature, fine liquid steel resistance and washing erosion, to ensure reliability in the course of product usage.

Tundish Impact Plate Refractory

The impact plate is used for liquid steel induction area of tundish, and the nozzle well block is used to install the nozzle, its mark, material quality and physical chemical indexes are similar to the slag dam. Users can make rational combination to the slag dam, impact plate and nozzle well block based on the smelting conditions and service conditions of tundish.

Dry Vibration Mix Refractory

Dry Vibration Mix is mainly used for tundish lining, which is the 3rd generation of high-tech product following insulation board and tundish coating, and this product is characterized by convenient construction, without baking and long service life.

Magnesia Alumina Carbon Brick, Alumina Magnesia Calcium Carbon Brick,Firebrick

Low carbon magnesia carbon brick using with crystal magnesite, fused corundum, fused spinel, high purity and ultrafine graphite and nano composite antioxidant as raw materials, which are used for ladle slag line. Low carbon and carbon-free corundum spinel bricks are used for ladle lining and bottom. It can realize ladle low carbon and carbon-free to meet the needs of high grade and ultra-clean steel. The products are characterized by corrosion resistance, penetration resistance, erosion resistance, spalling resistance and good integrity, to meet the need of complete refining ladle. It is the leading level in the domestic.

Refractory,Refractories,Refractory Material,Refractory Products at en1.chinaelong.com

             Refractory materials must be chemically and physically stable at high temperatures. Depending on the operating environment, they need to be resistant to thermal shock, be chemically inert, and have specific ranges of thermal conductivity and of the coefficient of thermal expansion.

          The oxides of aluminium (alumina), silicon (silica) and magnesium (magnesia) are the most important materials used in the manufacturing of refractories. Another oxide usually found in refractories is the oxide of calcium (lime). Fire clays are also widely used in the manufacture of refractories.

      Refractories must be chosen according to the conditions they will face. Some applications require special refractory materials. Zirconia is used when the material must withstand extremely high temperatures. Silicon carbide and carbon (graphite) are two other refractory materials used in some very severe temperature conditions, but they cannot be used in contact with oxygen, as they will oxidize and burn.

      Binary compounds such as tungsten carbide or boron nitride can be very refractory. Hafnium carbide is the most refractory binary compound known, with a melting point of 3890 °C. The ternary compound tantalum hafnium carbide has one of the highest melting points of all known compounds (4215 °C).

     Refractories can be classified on the basis of chemical composition.

Acidic refractories

     They consist of mostly acidic materials like alumina (Al₂O₃) and silica (SiO₂). They are not attacked or affected by acidic materials, but easily affected by basic materials. They include substances such as silica, alumina, and fire clay refractories.

Neutral refractories

      These are used in areas where slags and atmosphere are either acidic or basic and are chemically stable to both acids and bases. The main raw materials belongs to, but not confined to, R₂O₃ group. The common examples of these materials are alumina (Al₂O₃), chromia (Cr₂O₃) and carbon.

Basic refractories

      These are used on areas where slags and atmosphere are basic; they are stable to alkaline materials but could react with acids. The main raw materials belong to the RO group to which magnesia (MgO) is a very common example. Other examples include dolomite and chrome-magnesia.

Release the positive energy of refractory development

                      Release the positive energy of refractory development

          China has abundant mineral resources, including magnetite, bauxite has an absolute advantage, but in recent years with the refractory and related industries, the rapid development of these mineral resources, especially high-grade refractory materials have been fewer and fewer resources . Meanwhile, the disorderly exploitation, processing technology level is not high, the low level of resource utilization and waste more serious. China Refractory Industry Association official said, refractory raw material resources are imperative to cut costs. Rational use of fine ore, low grade ore is refractory industry resource conservation for sustainable development urgent task. In addition, waste treatment and recycling of refractory environmental protection, clean production and sustainable development of the refractory industry to achieve significance.

       "Promoting healthy and sustainable development of the refractory industry, a number of opinions" that will strengthen energy saving. Strengthen energy conservation management, and increase technological innovation, high energy-consuming equipment to improve high-temperature furnace energy efficiency, reduce unit energy consumption refractory products, and promote high-temperature kilns lightweight, high efficiency, energy saving. Development of monolithic refractory and unburned products. Development of "green refractory" to encourage recycling after use refractory. At the same time, will increase the level of resource utilization and protection capability as the refractory industry development goals, production capacity for high-end refractory, magnetite ore resources comprehensive utilization of mineral resources comprehensive utilization of refractoryclay are put forward specific development goals.

       En1.chinaelong produces refractory with low price and good quality, are exported to overseas, and gets the domestic and foreign customers consistent approval

How to choices the fire brick refractory

  Deciding what type of fire brick refractory you will use is one of the first choices you will have to make when starting to build a furnace. You will use fire brick in the cooking floor, the oven dome and perhaps for your decorative vent arch, oven landing and other decorative trim.
This page explains the different types of fire brick refractory and what the trade-offs are between them. It should help you decide what types of fire brick you are going to use, and it can help you find the right fire brick refractory at your local masonry supply store. It might be useful to take this page with you when you go shopping.
Here are some basic fire brick refractory types:
Medium duty fire brick. This is the fire brick refractory that we recommend for both the cooking floor and dome of the Pompeii oven. medium duty fire bricks are comprised of roughly 35% alumina and 50% silica, heat up quickly, easily withstand the 900F heat your oven will reach, and are designed for the rapid heat-up and cool down (thermal cycling) that your oven will experience. fire brick will also reach the heat required for pizza more quickly than clay refractory brick, as they are more efficient at conducting heat.
Further, because fire brick is designed to withstand thermal cycling, your oven will last longer, though for most home ovens this is not an important issue, and your oven will probably outlast you whichever brick you choose.
When choosing your fire brick, look for a refractory brick with straight edges for your cooking floor. It is important that the bricks in the floor fit against each other, and a curved edge will result in a gap between the fire bricks and in your cooking floor.
A typical fire brick measures 9″x4.5″x2.5″, weighs about 8 pounds and is yellow.
Red fire brick. This is the traditional red fire brick that you find at Home Depot and at masonry supply stores. Fire bricks are made from clay, and fired in a kiln. They are typically made from local clay, as shipping is too expensive, and fired to between 2000F – 3000F (high enough to fuse the minerals). You can use clay brick in the oven dome, but we would not recommend using them in the oven floor. There are trade-offs to consider.
There are two shortcoming to using a fire brick in your oven dome. First, thermal cycling will cause fire brick to spall, where little pieces of the fire brick flake off, and could cause individual fire bricks to crack. It has happened to us. Second, fire brick is not as good a conductor as fire brick and as a result will take longer to heat up.
Our view is that unless cost is a prohibiting factor, we would recommend fire brick. For example, a 42″ oven some has roughly 180 bricks in the dome, so the difference in brick cost should be around $100. In the context of the overall cost of the oven, and large amount of human capital you will be investing in your oven, we think the extra cost of worth it.
If your choice is to build your oven with fire brick or not at all, we would strongly recommend building your oven with fire brick.
Red fire bricks are typically used for building the decorative arch and optional sides around the oven vent and vent landing, and can be used for any decorative feature.
There are three types of fire brick that you should avoid.
Concrete fire brick. They are made from standard Portland cement-based concrete and are air dried, not kiln fired. They will not withstand the heat inside your oven.
High duty fire brick. These brick have very high alumina content, get very hot (1500F and up) and are designed for continual high-heat applications, such as furnaces. They are expensive, and will get too hot for some of your oven uses, such as baking bread and roasting. In general, pizza wants heat between 750F and 900F, while bread and roasts cooks best between 500F and 600F. (Note that brick ovens are able to cook at higher temperatures without burning because of the moist heat inside the oven and shorter cooking times.)
Insulating fire brick. These light-weight refractory bricks are designed to stop heat, and as such have low conduction and low heating holding capacity. They are often used to insulate industrial equipment. A typical insulating fire brick weighs about 2 lbs, compared with an 8 lb standard duty fire brick
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Brief Introduction of Fire Brick Refractory Feature

A firebrick, firebrick, or refractory brick is a block of refractory ceramic material used in lining furnaces, kilns, fireboxes, and fireplaces. A refractory fire brick is built primarily to withstand high temperature, but will also usually have a low thermal conductivity for greater energy efficiency, Now, we will brief analysis its famous features:

Heat Retention Qualities of Fire Brick

    Fire brick is a common building material used in the construction of fireplace and furnace linings. This type of brick is used because it has insulating properties, as well as the ability to store heat. Since the material properties of the brick are so different from mortar and regular brick, firebrick is usually installed to be independent of the regular masonry construction.

Thermal Conductivity of Fire Brick

      Fire brick is typically used as an insulating material. Even so, ordinary dense fire brick has a fairly high thermal conductivity. The thermal conductivity of dense fire brick used to line fireplaces is 1.40 Watts per meter Kelvin (W/(m*K)). There are low density fire bricks used to line areas not subject to impact, such as furnaces. These fire bricks, composed of a silica ceramic, have a thermal conductivity as low as 0.24 W/(m*K).

Density of Fire Brick

       There are two main types of fire brick. The dense type is typically used to line fireplaces and fireboxes of stoves that get a lot of abrasion from materials being burned. The light type of fire brick is mostly used as an insulator in places where it is not subject to mechanical abuse.

     Dense fire brick has a density relative to water of 2.4, while light fire brick has a relative density of only 0.60. Since density is how much a material weighs compared to other materials of the same size, we use water as the basis of comparison for all materials.

    The specific heat of a material is the amount of energy it takes to heat one kilogram of the material one degree centigrade, measured in Kelvin. The energy is measured in Joules. The amount of energy that is stored in fire brick is then a function of the density of the brick multiplied by the specific heat of the brick material.

    A dense fire brick has an energy density of 2.52 kilojoules per cubic meter per degree Kelvin [kJ/(m3*K]. A light fire brick has an energy density of only 0.36 kJ/(m3*K). By comparison, an ordinary red fire brick has an energy density of 1.4 kJ/(m3*K).

    In summary, a dense fire brick stores about eight times as much heat energy as a light fire brick, and can transmit the heat to a cooler surface about five times faster.

  

Focus on the study and development of refractory industry in China

China is the is the biggest country of refractory producing and consuming, and total production quantity in 2011 was 29,5 million ton, which made up 62% of total output in the word. Henan province is the base of refractory materials, and the production quantity is 13,86 million ton, which made up 47% of total output in China and whose importance should not be ignored.

Energy conservation and emission reduction has become more and more important, it will take a series of technology and policy measures to promote long life and adjustment of structure in high temperature industry such as iron and steel, nonferrous metal, and petrochemical industry. How to make high quality refractory material and carry out key important technology project with proprietary intellectual property rights is a main measure in promoting the improvement of refractory industry.

At this time, there are several advanced enterprises who are major in manufacturing technology and possessing all kinds of advanced refractory materials and casting materials, which makes a industry with great variety of goods and distinctive characteristics. By combine with producing, learning and producing, which mostly already establish an advanced refractory industry, and researching ability is abundant. In the areas of blast furnace, cowper stove, aluminium cell, cement kiln, glass kiln and coal chemical industry, Henan refractory enterprises all have abilities of forming complete set, technological innovation and product researching. Henan province has hold the basis element of future innovation in refractory industry.

In the future, the farther living and development of refractory industry in Henan should be base on cooperation, to establish a series of key techniques with proprietary intellectual property rights and solve the bottleneck of industry development in order to promote industrial competitiveness. Base on the improvement of researching, innovation, equipments and scale rather than relying on expanding of quantity.

Firebrick,Fire Brick,Firebricks,Firebrick Refractory,Refractory Brick

           A fire brick, firebrick, or refractorybrick is a block of refractory ceramic material used in lining furnaces, kilns, fireboxes, and fireplaces. A refractory brick is built primarily to withstand high temperature, but will also usually have a low thermal conductivity for greater energy efficiency. Usually dense firebricks are used in applications with extreme mechanical, chemical, or thermal stresses, such as the inside of a wood-fired kiln or a furnace, which is subject to abrasion from wood, fluxing from ash or slag, and high temperatures. In other, less harsh situations, such as in an electric or natural gas fired kiln, more porous bricks, commonly known as "kiln bricks" are a better choice.They are weaker, but they are much lighter, easier to form, and insulate far better than dense bricks. In any case, firebricks should not spall under rapid temperature change, and their strength should hold up well during rapid temperature changes.

Castasble,Refractory Castable,Ladle Castable,Tundish Castable at en1.chinaelong.com

Refractory castables

　Castable is simple production technology and energy production, use agile for cement kiln system, the characteristic is within the complex structure in the preheater system is becoming popular in the application. Applicable to the cement kiln of castable mainly includes the jade castable, just high aluminum pouring material, alkali pouring material and light pouring material, etc.

Types, Technical Properties and Application of Refractory Castable

Types of refractory castable
    Refractory castable mainly distinguished according to apparent porosity, anchoring agent, and types of aggregate. Besides that, refractory castable also classified according to applied temperate and functional characteristics when used. According to apparent porosity, it can be divided into compact refractory castable and adiabatic refractory castable whose apparent porosity is not less than 45%; according to anchoring agent, it can be divided to hydraulicity refractory castable, chemical constitution refractor castable and union refractor castable. The hydralicity refractory castable can harden in normal atmospheric temperature or by hydration, which mainly include portland cement, ordinary Calcium aluminate cement, pure Calcium aluminate cement and elect rometrical pure Calcium aluminate cement. The chemical constitution usually harden by adding curing agent to lead to chemical reaction in the normal atmospheric temperature, which mainly includes sodium silicate refractory castable, aluminum sulfate refractory castable and phosphate refractory castable. The union refractor castable turns to hard by sintering in the process of calcination, which mainly include Clay castable. According to refractory aggregate, there are clay aggregate (Al2O3 30%～45%),high aluminum aggregate (Al2O3%26ge;45%), silicon aggregate (SiO2%26ge;85%、Al2O3%26lt;10%), alkalin-ous aggregate (magnesite clinker and dolomite ) , special aggregate (carbon, carbide, spinel, zircon and nitride ) and adiabatic aggregate (pearlstone, vermiculite, ceramicite, floater, light brick sand, Porous clinker, and alumina hollow sphere). In the process of construction, it is available to use some mixture aggregate according to construction necessaries. Technical performances and applications of refractory castable
    Refractory castable as the main sort of unshaped refractory material, which can be used without fritting, besides that, among all he unshaped materials it with simple produce craft ship, needs no equipments, with high level of mechanization, easy to construct and with high coefficient of utilization. What’s more, refractory castable often have high intensity and can be made into fabricated material that used by furnace, for example, continuous casting weir plate preform which is pans available refractory castable.
     Refractory castable mainly used in casting industrial stoves, and also widely applied in fossil oil, chemical industry, electric power, mechanical industrial stoves, and thermal equipment.

Methods of Eliminating the Phenomenon of Ladle Nozzle Clogging

      A ladle nozzle is one of the slide gate ceramic elements. Systematic extension of the length of the steelmaking ladle campaign increases the demands on a ladle nozzle. The ideal solution would be a ladle nozzle which withstands the entire ladle campaign. In addition to thermal stability, ladle nozzles must be characterized by high resistance to corrosion and erosion caused by the flow of steel. An important factor affecting the durability of a ladle nozzle is clogging due to steel deoxidation products deposition in the nozzle channel. The phenomenon of clogging makes it difficult to regulate the rate of steel outflow from the ladle and, in extreme cases, can make the nozzle channel close. Clearing the nozzle by oxygen lancing accelerates its destruction.
Methods to prevent clogging:
 1. Ladle Refining Practice. A vacuum degassing treatment yields better cleanliness than does argon bubbling.
2. Reoxidation Prevention. Submerged ladle-to-tundish pouring, shielded tundish surface, ann leak-tight refractory joints will reduce exposure of the steel to oxygen and thereby improve cleanliness.
 3. Oxygen absorber Prevention.Optimal tundish flow patterns as well as filtration and electromagnetism techniques can remove Oxygen absorber products from the melt.
 4. Flux Enrainment Prevention. Submerged ladle-to-tundish pouring and avoidance of ladle slag carryover will reduce the amount of exogenous inclusions in the melt.

The requirements of refractory sliding nozzle

Sliding nozzle mainly stalled in the bottom of ladle, whose applied condition has got a big improvement comparing with plug, as its refractory part does not soak in molten steel for a long time. To sliding nozzle, slide gate is the key section, as its quality influences life span of nozzle directly.

The lower/upper nozzle only as a role of alleyway for steel running, but the upper nozzle is required to resist high temperature and eroding, which has the same life span of ladle well block. The lower nozzle is only used for one time, so which holds less demand than upper nozzle.

Both of upper/lower sliding plate are beard fastening pressure, and also required to slid and no molten steel overslow between them when pouring. So it is required to take finish machining to slip plan of upper and lower sliding plate, to make sure high parallelism and smoothness, besides, both of them are required rather high mechanical property.

Now the material of sliding plate mainly include: High alumina, Magnesia, Aluminum silicon carbide, Aluminum chromium, Aluminum carbon, and Aluminum zirconium carbon.

Above materials can be made into burned and unburned skateboarding brick.

As high quality sliding plate is expensive, one can choose  compound sliding plate, which is more appliable and economical.