What are the common refractories used in coke ovens? The difference between a refractory furnace and

The blast furnace is the main smelting equipment at present, which has the characteristics of simple public welfare and large production capacity. Refractory brick linings occupy an important position in blast furnaces. However, in the production process, due to various functions, the refractory brick lining of the furnace wall is gradually eroded.

Therefore, in order to prolong the service life of high-temperature furnaces, it is necessary to reasonably select refractory brick linings. The selection method of refractory brick lining in each part is as follows: (1) The furnace throat is mainly affected by the impact and wear of the charge.

Generally, steel bricks or water-cooled steel bricks are used. (2) When the thin-walled structure of modern large-scale blast furnace is adopted, refractory materials with good chemical erosion resistance and wear resistance should be selected, among which high-density clay bricks are the most suitable and are usually used to replace brick linings. (3) The main failure mechanisms are thermal shock spalling, high-temperature gas erosion, precipitation of alkali metals, zinc and carbon, and chemical erosion of primary slag.

The brick lining should be heat-resistant....

Coke oven is a continuous working thermal equipment that heats coal to 950-1100 under the condition of air isolation and obtains coke and its by-products by dry distillation.

The cause of coke oven lining damage is thermal stress and mechanical wear, and chemical attack is also one of the causes of furnace lining damage.

Therefore, the refractory materials often used in coke ovens are excellent silica bricks, magnesia bricks, high-alumina bricks and clay bricks, among which silica bricks have the largest amount and the best effect.

Silica brick is an acid refractory material, with good acid corrosion resistance, its good thermal conductivity, high load softening temperature, generally above 1620, only 70 80 lower than its refractory. The thermal conductivity of silica brick increases with the increase of working temperature, and there is no residual shrinkage, and the volume of silica brick increases with the increase of temperature during the oven process. Therefore, silica brick is an ideal refractory product on coke ovens, and important parts of modern large and medium-sized coke ovens (such as combustion chambers, ramps and regenerators) are built with silica bricks.

Clay brick refers to clay products made of 30% 40% aluminum silicate with Al2O3 content. Clay bricks are made of 50% soft clay and 50% hard clay clinker, which are batched according to a certain particle size requirement, and are fired at a high temperature of 1300 1400 after forming and drying. Clay bricks are weakly acidic refractory products, which can resist the erosion of acidic slag and acid gas, and have a slightly less resistant ability to alkaline substances.

Clay bricks have good thermal properties and are resistant to quenching and heat.

High-alumina bricks are refractory products made of aluminum silicate or alumina with an Al2O3 content greater than 48%, collectively referred to as high-alumina refractory products. The refractory and load softening temperature of high-alumina bricks are higher than those of clay bricks, and the anti-slag properties (especially for acid slag) are better, and these properties improve with the increase of Al2O3 content, but the thermal stability is not as good as that of clay bricks. High alumina bricks have high density, low porosity, high mechanical strength and wear resistance.

The furnace head of the coke oven combustion chamber and the bottom brick of the carbonization chamber are built with high-alumina bricks, and the effect is better.

With the increase in the demand for coke in the iron and steel industry, coke ovens are developing in the direction of large volume. Large-volume coke ovens place higher demands on refractories. At present, coke oven silica bricks are constantly developing in the direction of high strength, high density and high thermal conductivity.

Hello, the kiln consumables are less slippery heating furnace it is mainly flammable other materials for heating. The kiln is a refractory material used to fire products, and it is an essential facility in pottery molding. Human beings have a history of tens of thousands of years of ceramic firing, and have accumulated rich kiln styles and experience.

From the open fire on the ground in the primitive society, digging pits and building fires to the steamed bun-shaped flame kiln, the half-inverted flame horseshoe-shaped kiln, the Banpo dragon kiln, the duck egg-shaped kiln, and then to the current indoor gas pants to change the kiln and electric kiln, the kiln technology is constantly improving and developing.

Summary. The common refractory materials that are often used are silica bricks, semi-silica bricks, clay bricks, high-alumina bricks, magnesia bricks, etc.

The special materials often used are AZS bricks, corundum bricks, direct bonded magnesia-chrome bricks, silicon carbide bricks, silicon nitride bonded silicon carbide bricks, non-oxide refractories such as nitrides, silicides, sulfides, borides, carbides, etc.; Refractory materials such as calcium oxide, chromium oxide, alumina, magnesium oxide, oxide cap.

Frequently used thermal insulation refractory materials include diatomaceous earth products, asbestos products, thermal insulation boards, etc.

The amorphous refractories often used include charging materials, refractory ramming materials, refractory castables, refractory plastics, refractory mud, refractory gunning materials, refractory projections, refractory coatings, light refractory injections, gun mud, etc.

Hope it helps.

What kind of refractory material is generally used for the bottom of the blast furnace.

The common refractory materials that are often used are silica bricks, semi-silica bricks, clay bricks, high-alumina bricks, magnesia bricks, etc.

The special materials often used are AZS bricks, corundum bricks, direct clum-slip bonded magnesia-chrome bricks, silicon carbide bricks, silicon nitride combined silicon carbide bricks, non-oxide refractory materials such as nitride, silicide, sulfur bond macrocaride, boride, manuscript Zhengshu carbide, etc.; Refractory materials such as calcium oxide, chromium oxide, alumina, magnesium oxide, oxide cap.

Frequently used thermal insulation refractory materials include diatomaceous earth products, asbestos products, thermal insulation boards, etc.

The amorphous refractories often used include charging materials, refractory ramming materials, refractory castables, refractory plastics, refractory mud, refractory gunning materials, refractory projections, refractory coatings, lightweight refractory injections, gun mud, etc.

Hope it helps.

1. When the hot air temperature is lower than 900, the upper layer of the high-temperature lining brick and lattice brick masonry is made of high-alumina bricks, and the rest is made of high-grade clay bricks;

2. When the temperature is 900-1100, the high-temperature part of the lining brick and lattice brick are high-alumina bricks, mullite bricks or sillimanite bricks, and the rest of the parts are high-alumina bricks and high-grade clay bricks;

3. When the wind temperature is higher than 1100, the high temperature part must be made of low creep high alumina brick, mullite brick or silica brick. The insulating bricks used in the furnace lining insulation layer must be of the same or similar material as the working layer lining bricks. Honeycomb lattice bricks are commonly used for lattice bricks, and large porous or occlusive lattice bricks are also used.

The furnace shell of the hot blast furnace dome or bridge part, 4. Acid resistance:

When the vault temperature exceeds 1450, a corrosive agent is generated, which causes the furnace shell to corrode, causing cracks or cracks, so a layer of acid-resistant material can be sprayed appropriately.

5. Refractory materials for combustion chambers. Basically the same as that used in the regenerator, the air gas channel of the combustion chamber is generally built with clay bricks and high-alumina bricks, and the upper part with a radiation hole (nozzle) can be made of mullite bricks or mullite corundum bricks, and the part is made of high-alumina refractory castable prefabricated refractory prefabricated parts with nozzles, which also has a very good effect and is convenient for installation and construction.

6. Refractory materials for hot air pipes. Including air supply branch pipe, main pipe and blast furnace hot air enclosure. Clay insulating bricks with a thickness of 70-300mm are used as insulation layer lining, and the thickness of the working layer is generally 70-170mm, which is generally built with clay bricks, but the hot air outlet and the interface with the main air duct are made of high-alumina bricks or mullite bricks.

The blast furnace hot air enclosure pipe and air supply branch pipe are made of high-alumina cement or phosphate refractory castable poured with integral lining. The joint or bending part lining poured by refractory castable has good integrity and good use effect.

7. Refractory materials for hot air valve, hot air valve is heated on both sides, affected by mechanical vibration, corrosion, temperature change and other factors, poor working conditions, valve lining is made of clay bricks or high alumina bricks, and the life span is 6-10 months. Therefore, the hot air valve lining is generally made of high-alumina cement refractory castable poured in the manufacturing plant, and the service life can reach about one year.

8. Refractory materials for flues and chimneys. The flue and chimney are exhaust channels, and the hot blast stove adopts the lower exhaust method, and each hot blast stove is equipped with a branch flue, and the exhaust gas is discharged from the chimney through the main flue. The flue lining is generally made of clay bricks.

Chimneys are generally built with concrete or red bricks, and the lower part of the chimney is lined with clay bricks as a protective layer.

You can use refractory bricks or castables, and what is recommended to design it. High alumina bricks.

What kind of refractory materials are used for the temperature in the boiler furnace to reach more than 1200 degrees? Without refractory bricks, is there any other material?

Hello, dear, glad to answer for you A: Dear can also use dolomite bricks, mullite bricks, unburned bricks, low creep bricks, etc. Advanced Refractories:

Refractory materials with a refractory degree of 1770 2000 are building materials for the construction of kilns, combustion chambers and other high-temperature parts. It must have high refractoriness, high load softening point, good volume stability, thermal stability, slag resistance, and a certain mechanical strength. For example, dolomite bricks, mullite bricks, unburned bricks, low creep bricks, etc.

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An iron furnace is a shaft furnace used to melt pig iron for cast iron, and is lined with refractory bricks. The most widespread is cupola, and three-section furnaces or mixing furnaces are also used in small casting production; Reverberatory furnaces, electric arc furnaces, induction furnaces, etc. are also used in smelting high-quality or special cast iron. Small coke carbide furnace repair furnace generally uses heavy and light refractory bricks to make lining refractories, because the iron furnace is a high energy consumption, continuous operation furnace, the State Environmental Protection Bureau will also include this small iron furnace into the scope of control, for this small steel plant is simply a disaster, so the change of refractory materials for the iron furnace is also on the agenda, the fire dragon energy-saving composite refractory method in Shandong Iron and Steel, Anshan Iron and Steel and other steel plants smoothly used, through the local ** acceptance.

The structure of Huolong energy-saving composite refractory is composed of two materials: nano-thermal insulation felt and ceramic fiber castable.

·· Jinan Huolong Thermal Ceramics Co., Ltd

The effect of using refractory repair materials is good, and the details can be privately chatted.

The refractory material for the kiln depends on what kind of kiln it is, and the refractory material is selected by comprehensively considering various factors of the kiln.

Generally speaking, it is mainly divided into four types: refractories for glass pool kilns, refractories for cement kilns, castables for ceramic kilns and refractories for coke ovens.

The common refractory materials used in glass pool kilns are: clay bricks, silica bricks, zircon bricks, fused zirconia corundum bricks, thermal insulation materials, etc.;

Common refractories for cement kilns are: alkaline refractories, aluminum-silicon refractories, thermal insulation refractories, and castables;

Common castables for ceramic kilns are: clay refractory bricks, high-alumina bricks, silica bricks, magnesia-aluminum bricks, corundum bricks;

Common refractories for coke ovens are: clay bricks, silica bricks, etc.

Rayfa Refractory Technology provides:

There are a wide range of types of refractory materials for kilns, and the selection of refractory materials should be based on the furnace type, use temperature and use of the kiln, and the refractory materials are divided into customized products, refractory bricks and amorphous products, refractory castables, and series. According to the chemistry, it is divided into acidic, neutral, and alkaline materials.

Acid refractories use silicon oxide as the main component, and silica bricks and clay bricks are commonly used. Silica brick is a silica product containing more than 94% silicon oxide, and the raw materials used are silica, waste silica brick, etc., which has strong resistance to acid slag erosion, high load softening temperature, and the volume does not shrink after repeated calcination, and even expands slightly; However, it is susceptible to the erosion of alkaline slag and has poor thermal shock resistance. Silica bricks are mainly used in thermal equipment such as coke ovens, glass melting furnaces, and acid steelmaking furnaces.

Clay bricks are made of refractory clay as the main raw material, containing 30% 46% alumina, which is a weakly acidic refractory material, with good thermal vibration resistance, corrosion resistance to acidic slag, and is widely used.

Neutral refractories have alumina, chromium oxide, or carbon as the main components. Corundum products containing more than 95% alumina are a high-quality refractory material with a wide range of uses. Chromium bricks with chromium oxide as the main component have good corrosion resistance to steel slag, but poor thermal shock resistance, and low deformation temperature of high-temperature load.

Carbonaceous refractories include carbon bricks, graphite products and silicon carbide products, which have a very low coefficient of thermal expansion, high thermal conductivity, good thermal shock resistance, high temperature strength, resistance to acid, alkali and salt erosion, especially weak acid and alkali have good resistance, not wetted by metal and slag, and light weight. It is widely used as a high-temperature furnace lining material, and is also used as an autoclave lining for petroleum and chemical industries.

Alkaline refractories use magnesium oxide and calcium oxide as the main components, and magnesia bricks are commonly used. Magnesium bricks containing 80% of magnesium oxide and more than 85% have good resistance to alkaline slag and iron slag, and have higher refractory resistance than clay bricks and silica bricks. It is mainly used in open-hearth, oxygen blowing converter, electric furnace, non-ferrous metal smelting equipment and some high-temperature equipment.

Hello, this is better to ask a professional kiln manufacturer, otherwise it is always good to repair you.