How to choose a good castable?
We should pay attention to the following points when choosing.
1. wear resistance: castable resistance to impact and friction.
2. Thermal stress resistance: If the material with high moisture content is easy to match, it is not easy to cause thermal stress fatigue.
3. High-temperature performance: good high-temperature performance, dehydration shrinkage and stress release of steel structure prone to large cracks, high requirements for oven drying.
4. Appearance after oven drying: cracks, according to the code cracks appear 5mm is a normal phenomenon, more than to be filled to repair treatment, the appearance of cracks.
5. is it stable during heating operation?
The refractory castable is a kind of amorphous refractory with large quantity and wide application range in furnace construction. It not only enhances toughness, but also helps to improve its thermal insulation performance.
When we choose castable, we can choose suitable castables according to the above conditions.
What are the reasons for the damage of refractory castables?
Nowadays, refractory castables are mainly used in places where bricklaying is difficult, such as preheaters, discharge pipes and so on. People always think that the refractory castables often crack after pouring, or appear unshaped, shedding and other damage problems, but some are clear and good, which leads to many people do not know why, the following Let professional staff to explain to you the reasons for the damage of refractory castables.
1. One of the most important problems in the damage of refractory castables is chemical elements. The refractory castables are easily eroded by chemical substances in the use of boilers, and the lining of castables will be destroyed after chemical reactions such as gas, temperature and chemical slag occur.
2. Physically affected by temperature is also very large, repeated drastic changes in temperature will quickly destroy the structure of the castable, resulting in overall damage.
3. In addition to itself, external factors are also a major problem, many refractory castable damage is due to not in accordance with the strict requirements of the construction, resulting in the physical properties of the castable have been reduced a lot, so it is very easy to damage, and must be cleaned during construction, construction tools and equipment should also be kept clean.
In the actual production process, we may encounter problems far more than the above mentioned, but they often have some links, should be flexible according to the specific circumstances of the use of measures to deal with the problem, play castable refractory effect.
Precautions for storage and construction of refractory castables
Matters needing attention in castables storage:
1. Refractory castable should be stored in a dry, well ventilated environment, can not directly contact the castable with the ground, need to pad the tray, in order to avoid moisture absorption of castable.
2. Rainproof measures should be taken in open storage, and the materials should be inspected and tested before they are used beyond the storage period, so as to ensure that the properties are qualified and then reused. If the refractory castable has been hydrated, it should be stopped immediately.
Matters needing attention in castable Construction:
1. The construction surface contacted with refractory castable should be kept clean, and the dust, oil stain and rust on the surface should be removed in time. The size of placenta and formwork should meet the design requirements and have sufficient stiffness, strength and stability.
2. Placenta and formwork should be made of compact materials, good strength, smooth surface, low temperature environment, the strength of refractory castable will decline, so before drying, the castable can not be frozen, hot climate, the use of cold water mixed castable.
3. If the refractory castable is stored in the low-temperature warehouse, the furnace shell and formwork should be sprayed with water to cool down. During construction, the environment should be kept clean and no dust pollution should be produced. Clean tap water should be used.
About the storage of refractory castables and construction matters needing attention are introduced here first. The construction personnel should take this as a reference to correctly store and construct the refractory castables according to the actual situation, so as to ensure the good use effect of the refractory castables.
What are the differences between insulating bricks and firebricks?
Thermal insulation brick is the main role in our lives is used to heat preservation and reduce heat loss, thermal insulation brick will not generally be directly in contact with the flame, and firebrick is directly in contact with the flame, firebrick is used to withstand the flame baking, then what is the difference between lightweight thermal insulation brick and firebrick?
1. thermal insulation performance
The thermal conductivity of thermal insulation brick is generally 0.2-0.4 (average temperature 350 65
2. refractoriness
The refractories of insulation bricks are generally below 1400 degrees, while refractory bricks are more than 1400 degrees.
3. density
Insulation bricks are generally lightweight insulation materials, density is generally 0.8-1.0 g/cm 3 and refractory bricks are basically more than 2.0 g/cm 3 density.
In summary, we summarize as follows: refractory bricks have high mechanical strength, long service life, good chemical stability, no chemical reactions with materials and good high temperature resistance, heat resistance temperature can reach 1900%. Especially suitable for high and low temperature shift furnace, converter, hydrogenation converter, desulfurization tank and methanation furnace in chemical fertilizer plant, play a role of dispersing gas and liquid, supporting, covering and protecting catalyst. It can also be used in hot blast stove and heating conversion equipment in iron and steel industry.
What are the reasons for the damage of refractory castables?
Nowadays, refractory castables are mainly used in places where bricklaying is difficult, such as preheaters, discharge pipes and so on. People always think that the refractory castables often crack after pouring, or appear unshaped, shedding and other damage problems, but some are clear and good, which leads to many people do not know why, the following Let the staff explain to you the reasons for the damage of refractory castables.
1. One of the most important problems in the damage of refractory castables is chemical elements. The refractory castables are easily eroded by chemical substances in the use of boilers, and the lining of castables will be destroyed after chemical reactions such as gas, temperature and chemical slag occur.
2. Physically affected by temperature is also very large, repeated drastic changes in temperature will quickly destroy the structure of the castable, resulting in overall damage.
3. In addition to itself, external factors are also a major problem, many refractory castable damage is due to not in accordance with the strict requirements of the construction, resulting in the physical properties of the castable have been reduced a lot, so it is very easy to damage, and must be cleaned during construction, construction tools and equipment should also be kept clean.
In the actual production process, we may encounter problems far more than the above mentioned, but they often have some links, should be flexible according to the specific circumstances of the use of measures to deal with the problem, play castable refractory effect.
Precautions for storage and construction of refractory castables
Matters needing attention in castables storage:
1. Refractory castable should be stored in a dry, well ventilated environment, can not directly contact the castable with the ground, need to pad the tray, in order to avoid moisture absorption of castable.
2. Rainproof measures should be taken in open storage, and the materials should be inspected and tested before they are used beyond the storage period, so as to ensure that the properties are qualified and then reused. If the refractory castable has been hydrated, it should be stopped immediately.
Matters needing attention in castable Construction:
1. The construction surface contacted with refractory castable should be kept clean, and the dust, oil stain and rust on the surface should be removed in time. The size of placenta and formwork should meet the design requirements and have sufficient stiffness, strength and stability.
2. Placenta and formwork should be made of compact materials, good strength, smooth surface, low temperature environment, the strength of refractory castable will decline, so before drying, the castable can not be frozen, hot climate, the use of cold water mixed castable.
3. If the refractory castable is stored in the low-temperature warehouse, the furnace shell and formwork should be sprayed with water to cool down. During construction, the environment should be kept clean and no dust pollution should be produced. Clean tap water should be used.
About the storage of refractory castables and construction matters needing attention are introduced here first. The construction personnel should take this as a reference to correctly store and construct the refractory castables according to the actual situation, so as to ensure the good use effect of the refractory castables.
