Can be light qualitative firebrick used when heavy qualitative firebrick?

The system of light qualitative firebrick is usually secret small, basically use heat preservation, compression intensity is smaller, do not be able to bear or endure erode, not wear-resisting, do not contact blaze, cannot bearing. Intensity of compression of heavy qualitative firebrick tall, wear-resisting is able to bear or endure erode, do not suggest to use light qualitative brick to should weigh qualitative brick.


Light qualitative firebrick pledges firebrick is to point to porosity gently tall, density is low (be less than 1300kg/m3) , heat conduction commonly the low, firebrick that has heat proof quality of good and poriferous structure, also call adiabatic firebrick. The defect of light qualitative firebrick is to be able to bear or endure sex of shake of low, wearability difference, heat-resisting needs difference of broken bits sex, mechanical strength, cannot use at contacting broken bits, mechanical vibration directly big, bearing structure big, soot wears away large position. But the thermal insulation that regards industry as furnace, can drop quality of body of heater and environmental temperature. The function index of brick of commonly used light qualitative saggar should accord with the requirement of GB/T3994. Index of commonly used function of tall aluminous adiabatic firebrick should accord with the requirement of GB/T3995. Light qualitative firebrick is a kind of heat preservation fireproof material, it is to point to density of stomatic and firm, bulk the firebrick with heat conduction low, low rate. Light qualitative firebrick has poriferous structure (porosity is 40~85%) and high heat proof quality commonly.
Light qualitative firebrick has a variety of classification methods: Press bulk density classification. Density of bulk of light qualitative firebrick is 0.4~1.3g/cms; Exceed light qualitative firebrick under 0.4g/cm3. Undertake classified by use temperature. Microtherm heat-insulating material uses the temperature of 600~900 ℃ ; 900~1200 ℃ is in lukewarm heat-insulating material; 1200 ℃ above is high temperature heat-insulating material. Loss of accumulation of heat of body of industrial kiln build by laying bricks or stones and heat loss due to radiation of surface of body of heater occupy the 24~45% of specific fuel consumption about commonly. This practical and new-style use heat conduction to lead the light qualitative firebrick with low, small thermal capacitance, save burnup; In the meantime, because kiln furnace can heat quickly,cool, raised equipment to manufacture efficiency; Still can reduce weight of body of heater, simplify kiln system structure, improve firebrick quality, drop environmental temperature, improve labor condition. The defect of light qualitative firebrick is hole leads big, organization the inattentive, sex that fight broken bits is poor, rapid infiltration is fireproof in material aperture, cause broken, cannot contact broken bits body and liquid state metal directly; Mechanical intensity is low, wearability is poor, thermal stability is poor, cannot bear the weight of structure, cannot contact with charging, wear away serious. Light qualitative firebrick has above drawback, need not pledge gently commonly so firebrick, if cannot contact charging, can make slag, steam, mechanical vibration bigger. Light qualitative firebrick uses as more kiln furnace heat-insulation layer, liner or heat preservation.
Light qualitative firebrick has 4 kinds of production methods normally: Join content law burn oneself out. Say combustible adds a way again. Easy flaming combustible is joined in the slop of the firebrick that make, the pink that be like carbon, sawdust, make there is certain small opening after firebrick combustion. Bubble law. Foaming agent is added in the slop of the firebrick that make, be like colophony black, bubble with mechanical method, goods of firing and poriferous firebrick. Chemical law. Use the chemical method that can produce gas appropriately, poriferous firebrick gets when producing firebrick, commonly used method is to use dolomite or magnesian stone to add gesso, vitriolic for foaming agent. Porous material standard. Light qualitative firebrick uses natural diatomite or hollow ball makes grog of man-made person bubble, alumina or zirconia. Product of light qualitative firebrick basically has firebrick of light qualitative clay, light qualitative tall aluminous firebrick and firebrick of light qualitative silicon.


The firebrick that in pledging firebrick pledges firebrick is firebrick agglomeration craft again again, gives priority to with a few heavy simple stuff. Weight is very more multiple than pledging firebrick is weighed gently. In use process, not be for heat preservation, more important is for fireproof temperature. High quality firebrick is being used commonly contact directly with kiln furnace directly in the process, so high temperature resistant performance is average. Choose saggar or mix into to enter other and fireproof raw material, press multistage burden, shape via machine pressing, high temperature is firing. Heavy qualitative firebrick is commonly used at fireproof wear-resisting place, give priority to agglomeration firebrick in order to weigh qualitative data. Its weight is very more multiple than pledging firebrick is weighed gently. In use process, not be for heat preservation, more important is for fireproof, wear-resisting, anti-corrosive. Contact the blaze inside kiln directly in use process commonly, so heavy qualitative firebrick is had commonly taller high temperature resistant function.
Light qualitative firebrick is fireproof, bricky system is small, the price under heavy qualitative firebrick, it is the good choice of furnace of build by laying bricks or stones.
The difference of both coefficient of thermal conductivity: Performance of heat preservation of light qualitative firebrick is superior, coefficient of thermal conductivity is 0.2-0.4(average temperature commonly 25 ℃ of 350 ± ) W/m.k. The coefficient of thermal conductivity of heavy qualitative firebrick exceeds 1.0(average temperature 25 ℃ of 350 ± ) W/m.k. The difference of fireproof sex: The fireproof sex of light qualitative firebrick is in 1400 degrees commonly the following. The fireproof sex of heavy qualitative firebrick is in 1400 degrees of above. Density difference: Light qualitative firebrick uses light qualitative insulation material commonly, density is 0.8-1.0g/cm3 commonly. The density of firebrick is in basically 2.0g/cm3 above. Functional difference: Basically use gently at heat preservation heat insolation character, reduce prediction of a person's luck in a given year of quantity of heat thereby. Firebrick basically is used at roast blaze. Heat preservation brick does not contact blaze directly commonly, firebrick contacts blaze directly commonly.
Can be light qualitative firebrick used when heavy qualitative firebrick? The answer is negative. Heavy firebrick can be contacted with bright fire directly, but the hole rate of light qualitative firebrick is old, the organization is inattentive, cannot contact broken bits and liquid metal directly; Strength of heavy qualitative firebrick is great, bear the weight of force is powerful, but intensity of machinery of light qualitative firebrick is low, do not suit to be used at bearing the weight of structure, do not suit to be used at bearing the weight of structure, wear away serious. The main effect of light qualitative firebrick is heat preservation, the action of heavy firebrick is fireproof, recommend reasonable choose.