Refractory China, Refractories, Refractory Supplier, Refractory Materials - Changxing Refractory

Refractory China, Refractories, Refractory Supplier, Refractory Materials - Changxing Refractory

Ladle with refractory materials are used

refractory materials

Common types of ladle refractories:
(1) Clay refractory brick, clay brick A12O3 content is generally between 30% -50%, the price is low. Mainly used for ladle permanent layer and ladle bottom.
(2) high alumina brick. Brick A12O3 content of 50% -80%, mainly for the working layer ladle.
(3) wax stone brick. The refractory supplier brick is characterized by high SiO2 content. Generally more than 80%, anti-erosion than the clay brick and the integrity of the good, and not hanging residue. Commonly used in the ladle wall and package at the end.
(4) Zircon brick. The brick is mainly used for ladle slag line parts. Brick ZrO2 content is generally between 60% -65%.
(5) Magnesia carbon bricks. The brick is mainly used for ladle slag line parts, especially for multi-furnace continuous casting occasions. Brick MgO content is generally about 76%, carbon content of 15% -20%. It is characterized by small erosion of slag, erosion resistance, good resistance to spalling.
(6) aluminum-magnesium castables. The castable is mainly used for the steel body, and is characterized in that, under the action of molten steel, MgO and A12O3 in the castable react with each other to form aluminum oval spinel, thereby improving the thermal shock resistance of the lining.
(7) aluminum-magnesium carbon brick. This brick is developed on the basis of aluminum-magnesium castable ladle lining, long service life.
(8) Do not burn brick. At present, the materials used in ladle firing bricks can be made into corresponding unburned brick. Its characteristics are relatively simple production process, the price is lower. Brick itself has a certain mechanical strength and erosion resistance, easy construction masonry.
If the ladle itself is also used for refining, you can also choose MgO-Cr2O3-A10O3 series and magnesia carbon brick refractory, are: magnesia-chrome brick, magnesia-chrome-aluminum brick, dolomite brick.
In the content of ink material used for ladle lining brick, it is best to apply a layer of anti-oxidation coating on its surface to prevent burning in the package, the lining surface oxidation loose, affecting its service life.

More refractory:
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E-mail: sales8@chinaelong.com

Refractory materials for glass furnaces

Refractory materials

There are three key drivers behind the evolution of refractories: maintaining improved glass quality; economic requirements on glass kilns to make kilns run longer and impact after pure oxygen combustion systems.
The word "current" can be read in months or even weeks as the computer industry in the electronics industry changes. When it comes to the development and application of refractories in the glass industry, it can easily be read as five or ten years. Based on this notion of time, we will recall that there has been a change in the discussion of the "current" area (more conservatively) in the latter area.
There are three major driving forces behind the development of refractory materials. The first glass manufacturer typically needs to improve glass quality in order to maintain it at least. The second glass kiln economy required a longer kiln operation cycle and a third pure oxygen combustion system with impact. These three requirements usually determine the choice of improved refractories when repairing the kiln. These impetuses have also prompted the glass manufacturer to use the furnace with improved fire-resistant products for maintenance and repair, as well as the introduction of new technologies for a wide range of maintenance runs.
Melting-cast alumina bricks have been melting pool top this part of the establishment of its application, the main melting high-quality glass pure oxygen combustion furnace was applied. Prior to the advent of pure oxygen combustion technology, only beta alumina bricks were used to melt pool superstructure and no melt cast alumina bricks were used on top of the melting pool. Today, both β-alumina and α-β alumina melt-cast products are used to produce color TV (screen cone), float glass and borosilicate glass pure oxygen combustion furnace some or all of the roof. Melt-cast AZS bricks can typically be used at 1600 ° C or 1650 ° C (depending on the glazing), while furnace tops with fused alumina are successfully operated at 1700 ° C. This gives glass manufacturers greater flexibility when creating refractory glass.
For many years, melt-cast AZS roofs have successfully undergone a cooling and reheating test to enable them to use multiple operating cycles. There is now a bit of experience in the successful implementation of top cooling and reheating of fused-alumina roofing, demonstrating an economically viable life when they use two or more cycles of operation. The results of fused alumina furnace roof observation (thermal observation and shutdown) show that these materials are both chemically and mechanically stable. This was the earliest observation of this type of masonry study since there was neither a fused alumina reference nor the empirical basis of its roof application.
High-chromium refractory products used to be mainly used to enhance the glass furnace, and a small amount used in insulation glass pool furnace. High chrome bricks are increasingly being used by some soda lime glass furnaces. Its main use has not only been limited to all or part of the flow hole, but also for the end wall and to a limited extent for the filler brick. For high chrome brick components, they are potentially dangerously colored, so that high-chromium products are often not compatible with very "white" glass. In the initial period this product was mainly used for colored glass, but high chromium products have also been successfully used in transparent container glass furnaces. The use of high-chromium glass furnaces depends largely on the design of the liquid hole, the cooling of the liquid hole, the daily production of the furnace, and the operation of the furnace. A glass manufacturer may use high-chrome bricks for the entire cover plus the melting tank end wall. High Chromite brickwork liquid caves offer the potential to increase kiln life because this material provides at least twice as much resistance to most glass as molten AZS bricks. However, some design parameters differ from those of fused AZS bricks and need to be discussed with the supplier.

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Refractory materials for industrial furnaces

Refractory materials for industrial furnaces

Refractory materials for industrial furnaces:
High-strength lightweight clay high alumina brick, high-aluminum foam brick, poly light brick, light mullite insulation brick, heavy carburizing refractory brick, diatomaceous earth insulation brick, pearlite refractory bricks. All kinds of pit furnace, box furnace, carburizing furnace, trolley furnace, vibration furnace, steel chain plate furnace, mesh belt furnace, crucible furnace, push burning furnace, vacuum furnace, salt bath furnace with light, Heavy standard fire bricks, shaped bricks. Electric corundum furnace tube, silicon carbide furnace tube, high alumina furnace tube.
Electric radiant tube with corundum, high aluminum insulator, plug cover clip.
Electric furnace furnace with corundum silicon carbide brick, radiant furnace floor. Textile machinery singeing machine with a variety of specifications of silicon carbide fire bricks, honeycomb panels, masonry with a variety of high temperature adhesives.
Fire mud, anti-carburized mud, aluminum silicate fiber cotton, aluminum silicate fiber felt, aluminum silicate fiber board.

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Characteristic Refractory Material Mud Mixing Method

Characteristics of refractory material mud mixture method is to produce special refractory products, in particular the use of gypsum injection molding, casting and injection molding molding of the mud slurry f operation method is the ingredients of various refractory raw materials, enhancers, Suspending agent, admixture and 30 ~ 40% of the clean water, while adding a wear-resistant lining in the ball mill (mixing mill), after a certain period of mixing fine grinding, made for the production of mud slurry. In the process of making mud, according to the characteristics of materials and mud pouring their own requirements, to control the density and pH of the mud.
Mud mixing method used by the main equipment are ball mill, air compressor, wet iron, mud pump, vacuum degasser and so on.
Paraffin and resin-based binder, at room temperature for the solid refractory materials (or into a sticky), at room temperature, especially law mixture, must be used to increase the method of heating.
The use of hot casting process, the use of paraffin as a binder. Due to the melting point of paraffin in the 60-80 <€, in the first paraffin heated to 100T or more and have good mobility, and then the fine powder raw materials added to the liquid paraffin, the mixing after mixing, made of slurry Wax cake for hot die casting.
The main mixing equipment for heating the mixture is a heated mixing mixer.

The use of refractory materials in the metallurgical industry

refractory materials

Insulation Refractory material refers to refractory materials with high porosity, low bulk density and low thermal conductivity. It features a porous structure (typically 40% to 85% porosity) and high heat insulation.

Insulation refractory material used as the furnace insulation layer, lining or insulation layer, can save fuel costs. More types, mainly light refractory products, heat insulation and refractory materials and their products.

Lightweight refractory products

The main light of silicon refractory brick, light clay brick, light high alumina brick and alumina hollow ball products. Usually the weight of light refractory products is usually 0.6-1.2g / cm3, the use of temperature is usually 900 ~ 1350 Yi. Alumina hollow ball products can be used in the following long-term use.

2 refractory fiber and its products

Refractory fiber is a fibrous refractory material, is a new type of high efficiency insulation products. The main production method of refractory fiber is melt blown method, high speed centrifugation and colloid method.

Refractory fiber The main types of aluminum silicate refractory fiber, zirconium aluminum silicate refractory fiber, high purity high alumina refractory fiber, polycrystalline mullite fiber, alumina fiber, zirconia fiber and so on. In addition for low-temperature insulation of the slag cotton, glass fiber and so on. Refractory fiber products are refractory fiber as the primary raw material, processed by the various blankets, felt, board, rope, paper and other high-temperature insulation materials.

Refractory fiber products with small bulk density, low thermal conductivity, thermal stability and resistance to mechanical sensation. Refractory fiber products only 0.1 ~ 0.2g / cm3 bulk density. With fire-resistant fiber products do kiln lining, heat loss is small, saving fuel, heating up fast, especially for intermittent work furnace. In addition, fire-resistant fiber also has a soft, easy processing, construction and other characteristics. At present, the production and use of refractory fiber has been rapid development, metallurgical and other industrial enterprises demand for refractory fiber more and more urgent. After the use of refractory fiber, the energy saving effect is obviously improved.

More refractory material:
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Analysis on Product Characteristics and Classification of Mullite Insulating Bricks

Mullite insulation brick is mullite (3Al2O3 · 2SiO2) as the main phase of the high-alumina refractories. General alumina content of 65% to 75%. Mineral composition In addition to mullite, which contains the lower alumina also contains a small amount of glass phase and cristobalite; containing higher alumina also contains a small amount of corundum. Mullite insulation brick can be directly used for high temperature furnace lining, has been widely used in shuttle kiln, roller kiln, glass and petrochemical furnace lining.

First, the mullite insulation brick product features:
1, low thermal conductivity, with good insulation effect;
2, mullite insulation brick low melting, due to low thermal conductivity, mullite series of lightweight insulation brick accumulation of little heat energy, intermittent operation in the energy-saving effect is obvious; 3, impurity content is very low, Metal and other oxide content, therefore, high refractoriness; higher aluminum content in the reducing atmosphere to maintain good performance;
4, mullite thermal insulation brick high pressure strength;
5, the appearance of accurate size, speed up the masonry speed, reducing the use of refractory material mud to ensure the strength and stability of masonry, lining to extend the life;
6, mullite insulation brick can be processed into a special shape. To reduce the number of brickwork and joints.
Second, the mullite insulation brick classification: mullite insulation brick according to the density of different light and heavy mullite bricks, according to the use of different temperature is divided into: 1350 mullite insulation brick, 1450 mullah Stone insulation brick, 1550 mullite bricks and so on. Mullite insulation brick performance and its application: high refractoriness, up to 1790 ℃ or more. The softening start temperature of the load is 1600 to 1700 ° C. Room temperature compressive strength of 70 ~ 260MPa. Thermal shock resistance is good. There are sintered mullite bricks and fused mullite bricks. Sintered mullite brick to bauxite clinker as the main raw material, adding a small amount of clay or bauxite as binder, by molding, firing and made. Fused mullite bricks to high bauxite, industrial alumina and fireclay refractories as raw materials, by adding charcoal or coke fine particles as a reducing agent, forming after the use of reduced melting method to manufacture. The fused mullite is more crystalline than the sintered mullite and has better thermal shock resistance than the sintered product. Their high temperature properties depend mainly on the alumina content and the homogeneity of the mullite phase with the glass distribution. Mainly used for hot stove top, blast furnace and the bottom of the furnace, glass furnace regenerator, ceramic sintering kiln, oil cracking system, such as dead angle lining.

Low Cement Castable is More Widely Used in Aluminum Industry Than Before

Low cement castable mainly uses alumina material and silica powder as raw materials. It is a kind of powder materials, and is constituted by refractory material together with some agglutinant.

With the development of aluminum industry, the Clay, High Alumina insulating bricks for aluminum alloy melting furnace and holding furnace has been changed from phosphate combined high alumina brick to low cement castable which can prevent molten aluminum permeate refractory products. At the same time, it can extend service life of refractory material at high temperature.

When comes to the heating surface of aluminum, aluminum alloy melting furnace and holding furnace, the low cement castable has taken place of the phosphate combined with high alumina brick. The reasons are as bellow, there is smaller pore size in the structure of low cement castable, molten aluminum and aluminum alloy cannot permeate refractory company easily. It can avoid the oxide in refractory restoring from aluminum. At the same time, the low cement castable possesses high wear resistance. In recent years, as the low cement castable uses molten aluminum as additive, which increase the wetting agent, so the performance has been improved. This kind refractory material has taken place of traditional phosphate combined high alumina brick and low cement castable gradually.

Introduction of Runner castable

Low cement castable mainly uses alumina material and silica powder as raw materials. It is a kind of powder materials, and is constituted by refractory material together with some agglutinant.

    Runner castable is a kind of special castable which can flow without vibration and deaerate. When constructing, the product only needs a little water and can be poured into any shape without vibration.
    Runner castable is made from low cement castable and super-low cement castable, which is made from refractory aggregate, powder and high effective dispersing agent. When manufactured the runner castable, the most important thing is how to control size and quantity of powder, and how to mix with dispersing agent. Only with reasonable proportioning, and runner castable can flow by itself.
    Compared with common castable, the runner castable hold following advantages.
1. The runner castable can run without vibration with the help of deadweight.
2. Can run to every depart, especially where common castable cannot reach.
3. Can reflect the best performance of castable.
4. Reducing constructing time and save labour force.
5. Decreasing noise as more as possible.
    Without outstanding advantages, and application of runner castable is very wide, which can be widely applied for tundish, EAF triangular area, molten steel taping hole, heating furnace, blast furnace iron runner, iron casting induction furnace and so on.

http://www.yilongrefractory.com/news/Introduction%20of%20Runner%20castable.html

Modulation principle of slurry used for refractory brick

Light Weight Mullite Insulation Brick can be widely used as lining or insulation layers of various industrial furnaces and kilns in metallurgical industry, machine building industry, ceramic industry, chemical industry.

Brickwork with refractory slurry should follow the following principles:
    (1) to deal with all kinds of refractory slurry pre experiment and pre laying brick front, confirm the bonding time, different mud initial setting time, consistency and water;
    (2) Modulation of different mud to use different instruments, and timely cleaning;
    (3) Modulation is not homogeneous slurry to use clean water, water should be accurate weighing, blending uniformly, adjusted with the use. Have good hydraulicity and modulation of hard mud shall not add water use, has the initial setting of mud may not continue to use the;
    (4) Modulation with phosphate mud to ensure refractory material time trapped provisions, with the use of post set, well modulated mud arbitrarily diluted with water. This kind of mud for corrosive shall not be in direct contact with the metal shell.
    We take the zero defect management idea, through the refractory production process from beginning to end. All the time since, in the pursuit of perfect quality at the same time, also constantly improve the service system, concerned about each of your needs, to provide professional sales and technical service for you.

http://www.yilongrefractory.com/news/Modulation%20principle%20of%20slurry%20used%20for%20refractory%20brick.html

The Best Refractories for Induction Furnace -- 25+ Heats Silica Ramming Mass

In recent years, silica ramming mass is widely used in induction furnace. Compared with traditional refractory lining material, this product is of lower cost, shorter sintering time and better working condition. 


To offer clients better refractory products, we have successfully developed our 25+ heats silica ramming mass. As per actual working, we summed up the material consumption as following.
1. First heat: 10-15mm
2. Rest heat: 3-5mm


As per our experience, we should leave 70mm as save level. So if the lining thickness is 180/300/450mm, we could promise the least service life of our refractory material to be 25 heats. If the working condition is convenient, 30-40 heats is no problem.


 Furthermore, our silica ramming mass can also be applied in tundish and ladle. Service life can namely be 48-60 hours/ 200+ heats. 


Because of the great advantages as above, our silica ramming mass is very welcomed by our clients all over the world say Bangladesh, Ghana, South Africa, and Indonesia, etc. If more interests, please feel free to make us informed, our professional teams are ready to give you our reliable service. For new clients, we would offer more preferential as following.
1. Lower price trial order
2. Professional refractory technicians overseas service


Therefore, what are you waiting for? Talk your phone and call us!

http://www.yilongrefractory.com/news/The%20Best%20Refractories%20for%20Induction%20Furnace%20--%2025+%20Heats%20Silica%20Ramming%20Mass.html

How to Choose Refractory Bricks Used for Different Parts of Blast Furnace

Mainly used for coke oven, hot blast stove, acid steelmaking furnace and glass melting furnace. The products can be manufactured according to customers' different requirements.

 How to use Refractory let it has anti damage ability? The development of matching with refractory material according to the clinker rotary kiln each work with the different mining conditions, in a targeted manner to configure different anti damage of refractory materials, and considering the basic matching problem of each work tape lining service life, reduce maintenance times to stop the kiln, each work with lining, reach namely damage resistance independent and phase the purpose of matching cycle. Lining material preheating zone selection of good chemical stability, alkali erosion leaf wax stone brick and strong, the high siliceous raw pyrophyllite with low alkali, alkali resistant bricks made of this raw material, whether or not to burn the Chengdu firing with alkali resistance strong, but the strength is high, nearly doubled than clay brick life.
    The completion of the industrial experiment stage in Krivoy Rog coking plants, coke oven masonry and recommended room three thermal repair methods: flame gunning; using oxygen to the ceramic welding; using the exothermic material (heating material) to repair. The process principle of common: with the help of heat generated to form a protective layer on the surface of refractory composite masonry mending surface.
    Flame gunning method of flame gunning refractory products, powder particles melt in the liquid or gaseous fuel flame, and was sent to the surface to be repaired. At this point the masonry was nozzle flame supplementary heating, so using this method may not have special restrictions on temperature is put forward in this paper, and can adopt refractory powder cheaper to obtain high-quality gunning layer. Principle of ceramic welding method is adding to the material of strong oxidant (exothermic material) - aluminum and silicon. Wind transport by means of oxygen jet flame method, oxidant and refractory powder to the surface to be repaired.

http://www.yilongrefractory.com/news/Increase%20refractory%20materials%20anti%20damage%20ability%20by%20changing%20using%20method.html

Requirements of Refractory Materials During Blast Furnace Lining Repair

Composed of high temperature electric sintered anthracite and graphite with additives, the products are mainly used for filling the gap between carbon blocks and cooling devices through cold ramming process, and also for the gaps between carbon blocks and between carbon blocks and refractor bricks.

Generally speaking, there are several blast furnace lining maintenance methods including grouting for lining making, cold spray technology, digging hole on furnace shell technology and remote control spray technology.


Grouting for lining technology can be widely applied to hot point short-term repair of blast furnace stack and furnace bosh. It is a means of prolonging furnace life, but it must be repaired repeatedly to keep the lining at a certain thickness. Different furnace parts use different refractory material, the mud consistency is a key element for the success of grouting for lining technology.


Using cold spray technology not only can make blast furnace cleaned thoroughly, but also can firmly bond old and new firebrick refractory and then lead to a good furnace lining form and make the first run of the blast furnace successful. While, repairing blast furnace in cold spray technology needs too much time, it is a limited element for its widely using.


Digging hole on furnace shell and gunning damaged parts with long gun technology is usually applied to damaged furnace lining and shell technology, it uses a long gun to spray and repair the inside damaged parts from outside. This method has the advantages of speed spraying and short wind time, but it is only suitable for partial damage.


Remote control gunning technology is an advanced technology which is now being developed and used in China and many other countries in recent years. Its gunning time is short and its gunning range is large, but it needs complex technology. 


In a word, grouting for lining technology requires appropriate refractories mud consistency; the other three repair technologies require good refractory adhesion under high temperature and normal temperature so that to make spraying coating in a certain thickness continuously, and the coating is tightly bonded into a no pull-off and dense formation which can be dried and warmed fast.

Measures to solve refractory brick damage

After analyzing mechanism and causes of refractory brick damage, then we can take corresponding countermeasure and measure according to these reasons to reduce the damage, so as to achieve purpose of extending service life of refractory brick.    According to the explanation of our technical staff, we know the cause of refractory brick physical damage and chemical damage ash and kiln skin erosion thin, mechanical damage and the refractory brick masonry quality. That is to say to extend the service life of refractory bricks in burning zone, in addition to select suitable suppliers, shall be laid a good grasp of building quality, maintain the skin at the kiln during operation. The specific measures taken are as the following two aspects.

On the one hand, maintaining the quality of laying refractory brick.

1. Cement ratio and dilute the appropriate thick. Specific detection method is easy to spread the cement shop into the brick, and can not flow. Too thick is not easy to spread too thin, is easy to flow; two is in a brick on the fire clay, pressure on another brick slightly strong kneading, and then lift up the brick body, the brick below belt, that the proper proportion of cement.

2. The front of refractory brick to be close to the cylinder. Between the brick and the cylinder body cannot pad fireclay and other debris. In the pool of fireclay brick, in front stretcher rectangular to leave 1 to 2 cm position does not stand in the cement, upward pressure brick, end close 

to the cylinder pressure to the fireclay, knead move, make cement covered the face brick, a small amount of excess cement extruded from the bricks and the small end of the big two, brick end matter stick cylinder. Brick joints cannot be greater than 1.5mm. Check brick facet, row not up, wrapping phenomenon.

3. The top tight top bar. In half of the circumference of the masonry, with top carry to brick top tight, rotary kiln bricks on the other half of the week, when the top bar must be the top tight. Some cube material should be laid between brick and the top bar, to avoid damage of refractory brick. Method to check whether the roof top bar tension is, when the top bar with the rotation of the cylinder to check the cylinder top brick not flagging lock position, if the sagging phenomenon, in the kiln and kiln refractory during the relative displacement caused by mechanical damage to the refractory brick.

For the other aspect, click here for the next industry news.

On the other hand, hanging up and maintain kiln coating. We suggest taking the following measures. 

1. For kiln operation training and guidance. Before firing, give the workers a training about kiln operation. Clearly pointed out that in any case, hang up and maintain good kiln crust is mainly the responsibility of kiln. At the same time about operating method under different conditions to them, in the actual operation, according to the kiln to give operation guidance and comments in a timely manner, to carry out technical exchanges between operations, and constantly improve the technological level of operation.

2. Coal spraying pipe should be put in the proper position which tending to the lowr side is the best.

3. Improving technology level.

4. Proper proportioning solution: the quantity of liquid phase resistance is suitable in 22-24%. Too low is not easy to hang kiln skin, too much can narrow the range of sintering temperature, silicate minerals reduce, not conducive to the operation and improve the quality of clinker.

Refractory Materials

Refractory Materials

    The supply of refractory materials is a key issue for the world steel industry. Yilong Refractory manages refractories that widely used in steelmaking, metallurgy, glass making, cement making, ceramic making, etc.

    Iron ore and coking coal are used mainly in the blast furnace process of ironmaking. For this process, coking coal is turned into coke, an almost pure form of carbon, which is used as the main fuel and reductant in a blast furnace.

    Typically, it takes 1.5 tones of iron ore and around 450 kg of coke to produce a tone of pig iron, the raw iron that comes out of a blast furnace. Some of the coke can be replaced by injecting pulverized coal into the blast furnace.

    Scrap iron is mainly used in electric arc furnace steelmaking. As well as scrap arising from the making and using of steel, obsolete scrap from demolished structures and end-of life vehicles and machinery is recycled to make new steel. Around 500 million tones of scrap are melted each year.

    Refractory is a common material on the earth’s surface. Most refractories are located in China, carried to dedicated ports by rail, and then shipped to steel plants in Asia, Africa, South America and Europe.

    Sea freight is an element of major concern for steelmakers today, as the high demand for raw materials is causing backlogs at ports.

    To see more information about refractory products, go to the www.yilongrefractory.com.

Refractory Brick>Semi-graphitic Carbon Block

Refractory Brick>Semi-Graphitic Carbon Block

Introduction

It uses high temperature electrical calcined anthracite as main material, medium temperate pitch as binder, through forming, high temperature baking, final precision machining. It features good thermal conductivity and alkaline resistance. It is economic and practical, and mainly applied for blast furnace bottom.

For more information, click here. 
For more products, click here.