fire brick is mainly used to heat insulation, reduce the loss of heat, fire bricks generally do not directly contact the flame, and refractory bricks generally direct contact with the flame. refractory bricks are mainly used to withstand the baking of the flame. generally divided into two kinds, that is, unshaped refractories and stereotypes refractories. unshaped refractories:
also known as castable, is a variety of aggregate or aggregate and one or more adhesive composition of the mixture of powder particles, the use of one or more must be with the liquid mixing evenly, with a strong flow sex. refined refractories: general system of refractory bricks, the shape of the standard rules, can also be built according to the need for temporary processing.
fire bricks and refractory bricks are the main differences between the following:
1. insulation performance
insulation brick thermal conductivity is generally 0.2-0.4 (average temperature 350 ± 25 ℃) w / mk, and the thermal conductivity of refractory brick at 1.0 (average temperature of 350 ± 25 ℃) w / mk above, which can be obtained insulation brick the insulation performance than the fire-resistant insulation properties of the brick is much better.
2. refractoriness
insulation brick insulation is generally below 1400 degrees, while the fire resistance of refractory brick in more than 1400 degrees.
density
insulation bricks are generally lightweight insulation materials, the density is generally 0.8-1.0g / cm3 and the density of refractory bricks are basically 2.0g / cm3 or more.
in combination, the refractory bricks have high mechanical strength, long cycle life and good chemical stability. they do not react chemically with the material and have high heat resistance. the maximum heat resistance can reach 1900 ℃. it is especially suitable for dispersing gas and liquid in the high and low temperature conversion furnace, conversion furnace, hydrogenation converter, desulfurization tank and methanation furnace of chemical fertilizer plant and supporting, covering and protecting the catalyst. can also be used in the steel industry hot stove and heating conversion equipment.
refractory bricks have the advantages of high density, high strength, wear resistance, good corrosion resistance, small thermal expansion coefficient, high grinding efficiency, low noise, long service life and no pollution. is suitable for a variety of grinding machinery of high-quality grinding media.
refractory bricks and insulation brick is very different, their use of the environment, scope, role is not the same. different locations will use a different material, in the purchase of materials, we have to according to their actual situation, decide which kind of refractory materials for their own use.
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