The characteristics of refractory fiber

1 high temperature resistant.

The highest use temperature up to 1250~2500 degrees. The most commonly used asbestos is 

only 500~550 degrees, 580~830 degrees C and slag wool, aluminum silicate fiber reaches more than 1000 DEG C.

2 conductivity is low.

Refractory fiber under high temperature thermal conductivity is very low, such as 1000 DEG C, thermal conductivity of aluminum silicate fiber only for clay brick lightweight clay brick 20%, 38%.

3 small volume densities.

Generally 0.1~0.2g/cm fand, general clay brick lightweight clay brick for 1/20~1/10, 1/10~1/5. Therefore, the application of industrial furnace refractory fiber instead of refractory brick, the furnace body weight, wall thickness. Such as heating furnace lining is reduced by 80%, the furnace wall thickness of 50%.

4 good chemical stability.

In addition to alkali, fluoride, sulphate, almost not affected by chemical erosion.

5 good thermal shock resistances.

Regardless of the fiber material or product, all brick incomparable good thermal shock resistance.

6 low thermal capacity.

1/72 heat capacity of fiber material only light refractory brick, clay brick 1/42. Refractory lining in the afternoon to do, heat loss is small, fuel saving, fast temperature rise, the intermittent operation furnace was love.

7 soft, easy processing.

Can be made into a variety of products and shape of parts, construction is convenient, the labor intensity is low, the effect is good.

Methods to decrease the porosity rate of refractory brick

Production of refractory  brick  is always encountered too many holes, how can we reduce the occurrence of this situation? Today we shall all requirements to introduce how to reduce the rate of porosity of refractory brick.

Selection of high density, low water absorption rate of the raw material, through the reasonable distribution is the key to prepare low porosity refractory brick. Refractory brick is used 50% of the soft clay and 50% hard clay clinker ingredients, according to a certain size requirements, forming, drying, firing at high temperature of 1300~1400 DEG C under the. Refractory mineral is mainly composed of kaolinite (Al2O3 – 2SiO2 – 2H2O) and 6%~7% impurities (potassium, sodium, calcium, titanium, iron oxide). The sintering process is mainly kaolinite continuous dehydration decomposition of mullite (3Al2O3 – 2SiO2) crystallization process. Refractory brick in SiO2 and Al2O3 on the sintering of eutectic of low melting point of silicate and impurities in the formation process of mullite crystals surrounded by around. In the process of baking temperature control at 1350 to 1380 DEG C, appropriate to increase the low porosity clay brick firing temperature (1420 C), refractory brick contraction increased slightly, so that the refractory brick density increases slightly, and low porosity can be reduced.

Refractory materials mainly used what place

Refractory material is the basis of materials in the field of high temperature technology. Department of applied very widely. Which is the most widely used in a variety of thermalequipment and high temperature in the container as resistance to high temperature structural material and lining. In the iron and steel metallurgy industry, coke oven is mainly composed of refractory materials. BF and hot blast furnace iron making steelmaking furnace, heating furnace, soaking pit, are absolutely indispensable in accordance with requirements of various refractory material. Not only the liquid steel casting to consume a large amount of refractory material, casting more need some high quality  refractory materials. Refining outside the furnace refractories have superior species would not be able to achieve. The statistical results show that the iron and steel industry is the most need the Department refractory material, accounting for about 60% of the total output of refractory materials. Smelting and processing of non-ferrous metals is also inseparable from therefractory material. High temperature operation Department of building materials industry and other silicate products, such as all the high temperature furnace glass industry, cement industry, ceramic industry and its lining must be made of refractory material to build. Other such as chemical industry, power, machinery manufacturing and other industrial high temperature operations in a variety of baking furnace, sintering furnace, heating furnace, boiler and flue, a chimney, protective layer must be refractory material.

In short, when some structures, apparatus, equipment or containers, in more than 1000 high temperature operation, because there may be a physical, chemical and mechanical effects, the deformation and the softening and melting material, or erosion, erosion, collapse or damage phenomenon, not only can make the operation could not be sustained. The service interruption, affect the production of materials, processing and pollution, affecting the quality of the products; it must adopt the refractory material with resistance to high temperature.

Requirement for fireclay bricks acceptance

Acceptance of fireclay bricks masonry of refractory brick works, to carefully check the flue gas in the furnace at, in, particular attention should be paid to the single arch, vault, and the bottom of the equipment. Then I will give you detailed introduction:

1, in the building when the fire clay brick, refractory and mud, labeling, etc., composition and levels are required to comply with the specifications and drawings;

2, to ensure the quality of construction fire clay brick is good, also is to follow the wrong sewing, levelness and verticality, mortar joint thickness and size and drawings in accordance with standards;

3, in the process of acceptance of the furnace body, assigned for the shop assistant director must come from above, each part of the furnace body check, made several mortar joint thickness inspection, furnace body parts measured by the size of the acceptance certificate of admission, careful examination of many important structure of the furnace body. The building block.

The above is to introduce you to the acceptance of clay firebrick, for reference purposes only, hope to help you, if you need to purchase, please contact us!”http://www.chinafirebrick.com”

Main factors affecting the service life of the refractory bricks

According to the long-term use of refractory bricks and refractory brick life mainly includes the influence of the specific use of the environment, the operating temperature of refractory brick
kiln, the use of the number of fly ash erosion. The principle of damage of refractory brick includes three aspects, the solubility, permeability, cinder of refractory brick erosion, friction. These three processes and ultimately affect the service life of the refractory brick, firebrick damage caused by.

Slag brick permeability leads to uneven texture, when encountered high temperature refractory bricks, due to uneven texture, resulting in heat coefficient is not the same, cracking caused by refractory brick. According to the summary of practical application, start and stop times increase the erosion of furnace firebrick, so the reasonable control of furnace of the open stop times can prolong the service life of refractory bricks.

Effect of fly ash on properties of  refractory brick is relatively large, very permeable brick composition of fly ash is silica, a relatively high calcium oxide, if these two components in coal ash, so the erosion of refractory brick is very large, a reasonable construction of the two components can reduce the erosion of refractory bricks to improve refractory brick service life.

Changxing IF furnace ramming material advantage

Now, no matter what kind of industry, everyone can see, there are a lot of new products appear in everyone’s attention, let the life of people is very good, like the Changxing IF
furnace ramming material is one of them, but after the market learned that, a lot of people with this knowledge, we are not very clear, here, the professionals to introduce this aspect knowledge.

First of all, professionals, for material in actual use  Changxing intermediate frequency furnace, this is the choice of a high-temperature adhesive quality, in actual use, we can find the crack resistance, have very strong, and the quality is very good, which also contains a large number of high purity quartz sand, quartz powder, in this case, you will have a good temperature resistance. Actual use, the temperature can reach 2000 degrees, because of this, in the present, has been widely used in non-ferrous metal and ferrous metal continuous operation and uninterrupted operation environment, and the use effect is very good.

Secondly, the Changxing Refractory intermediate frequency furnace ramming material has a comparative advantage, it is in actual use, but also can play without residue, no crack, no failure, with such benefits, a lot of advantages which is one of the.

Changxing intermediate frequency furnace ramming material advantages of knowledge and to share with you here, hope to bring some help, if you want to know more about this knowledge, everyone please pay attention to our website “http://www.yilongrefractory.com”, will continue to introduce the knowledge of the materials.

Room temperature compressive strength of refractory materials

Compressive strength refers to the maximum pressure unit of material under normal temperature area can bear, N/mm2 MPa (MPa) said. Room temperature compressive strengthof refractory materials is an important technical property of materials. Although in general the thermo technical equipment Institute of refractories under static load is small, generally not more than 0.1~0.2 N/mm2, top brick is not more than 0.4~0.5 N/mm2, large blast furnace, hot air furnace, open hearth brick regenerator checker brick layer, the maximum load is less than 1 N/mm2. In addition to the improper transport and masonry, make the material by the impact and extrusion and may be damaged, rarely for room temperature compressive strength is low and the destruction of materials. In the current standards are specified compressive strength of refractory products at room temperature not lower than that of 10~15 N/mm2, for advanced refractory product requirements in the 25~30 above N/mm2, is mainly because the cold crushing strength ofrefractory products are the parameters of its organizational structure, especially the sensitive parameters of microstructure. While the material micro structure formation is restricted by material preparation process of various factors, such as raw material characteristics and mixture ratio, particle size and gradation, inter particle binding, molding process and sintering condition, have important effects on Micro structure of materials. Therefore, compressive strength at room temperature is a reliable method for testing the current process status. In addition, through the room temperature compressive strength of materials can be evaluated indirectly the merits of other mechanical properties, such as 2~3 times the normal temperature compressive strength generally refractories is about bending strength is 5~10 times; tensile strength; good wear resistance and impact resistance of all has high tensile strength at room temperature corresponding. Moreover, method for determination of compressive strength at room temperature is simple. Therefore, compressive strength is the routine test and judge the quality of products.