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Fire Clay Bricks for Sale
Fire Clay Bricks for Sale in Rongsheng Factory is a kind of clay products with 30~40% Al2O3 content. ClayFire Bricks are most widely used in industrial kiln application with various features of cheap, wear resistance, low thermal conductivity, good thermal insulation, easy operation and installation. Welcome To Buy Cheap Fire Clay Bricks From Rongsheng Kiln Refractory Bricks Manufacturer!
Mineral composition of clayfire bricks are mainly kaolinite (Al2O3·2SiO2·2H2O) and 6~7% impurities (oxide of Ka, Na, Ca, Ti, Fe). The firing process is mainly dehydration and decomposition of kaolinite continually. SiO2 and Al2O3 in firing process with impurities form eutectic melting point of silicate and surround around the mullite crystal.
Clayfire bricks belong to faintly acid refractory product that can resist acid slag and gas erosion. It has a bad resistance to basic compounds. But its thermal shock property is good.
Comparison of Fire Clay Bricks for Sale and Silica Refractory Bricks
Fire Clay Bricks’ refractoriness, similar with silica refractory bricks, reach up to 1690~1730℃. But its refractoriness under load is lower over 200℃ than silica refractory bricks. Because Fire Clay Bricks not only contain high refractoriness mullite crystal, but also contain almost half low-melting-point noncrystalline glass phase.
At the temperature range of 0~1000℃, Fire Clay Bricks’ bulk will expand uniformly with the temperature rising and the linear expansion is similar with a straight line. Its linear expansivity is 0.6~0.7% that is only about half of silica refractory bricks’. When the temperature reaches up to 1200℃ and then keeps rising, its bulk will start to shrink from the maximum value of expansion. Fire Clay Bricks’ after contraction result the crack of brick mortar joint which is a big disadvantage of fireclay brick. When the temperature reaches up to 1200℃, fire clay bricks’ low melting temperature phase starts to fuse little by little. Stay together very close with the surface tension function on the particle that result the volume shrinkage.
Classification of Fire Clay Bricks for Sale
Fire clay bricks for sale can be classified into clayfire bricks for blast furnace, fireclay brick for hot blast stove and large-scale fire clay bricks for glass furnace according to its application.
Fire Clay Bricks for Blast Furnace
Fire clay bricks for blast furnace are manufacture with fire clay as raw material to build lining of blast furnace. Fire clay bricks for blast furnace are used for linings of furnace throat, furnace stack, furnace hearth and furnace bottom in small blast furnace, and furnace stack in large blast furnace.
Fire clay bricks for blast furnace are required for properties of high refractoriness in common temperature for good wear resistance in long term service, low shrink in high temperature service for long term that result to protect the integrality of lining.
Fireclay brick for hot blast stove is a kind of fire clay bricks that are manufactured with raw material of fire clay to build blast furnace hot blast stove. Clayfire bricks for hot blast stove is used for hot blast stove, regenerative chamber and protection wall with good features of great thermal shock resistance, high refractoriness under load and less creep deformation.
China (YB/T 5107-1993) classify fire clay bricks for hot blast stove into three brands of RN-42, RN-40 and RN-36 according to physicochemical indexes. Its physicochemical indexes and permissible variation in dimension are stipulated as following:
When slabbing width is not more than 0.25mm, the length is unlimited.
When slabbing width is 0.26~0.50mm, the length is not more than 30mm.
When slabbing width is more than 0.50mm, the brick is below standard.
Large-scale Fire Clay Brick for Glass Furnace
Unit weight of large scale fire clay brick used to build glass furnace is not less than 50kg. China (YB/T 5108-1993) stipulates the physicochemical indexes, permissible variation in dimension and appearance of large scale fire clay bricks for glass furnace use.
This standard also stipulates the following points for the fracture surface of fireclay brick:
The fracture surface of clayfire bricks:
Length of Brick≤400mm. When slabbing width is 0.26~0.50mm, the length is not more than 40mm. When slabbing width is 0.51~1mm, the length is not more than 25mm.
Length of Brick＞400mm. When slabbing width is 0.26~0.50mm, the length is not more than 80mm. When slabbing width is 0.51~1mm, the length is not more than 50mm.
Slabbing width of Crack ＜0.25mm, the length is unlimited.
There should not exit hole and crack that are more than 1mm on the fracture surface.
Application of Fire Clay Brick for Sale
As the refractoriness under load of clayfire bricks are low, result expansion in high temperature, thermal conductivity is lower 15~20% than silica refractory bricks, mechanical strength is weak than silica brick. Fire clay bricks can be used for the secondary position in coke oven such as protection wall of regenerative chamber, lining brick of sole flue, furnace door, furnace top and ascension pipe.
Rongsheng, as a professional and leading kiln refractory materials manufacturer in China, can provide quality and cheap Fire Clay Bricks that exhibit excellent performance of high density with low porosity, strong resistance to erosion, high refractoriness under load, great cold crushing strength and high mechanical strength etc. Contact RS for lower price and faster delivery!
