Light qualitative firebrick is become in the fire after a few special substance are being added in firebrick production process. Double its porosity is common firebrick, the 0.5-3 that firebrick density is coessential firebrick times. Coefficient of thermal conductivity is small, can serve as the heat-insulation layer of furnace or liner, reduce hot loss; To intermittence job furnace, heat loss due to radiation of boiler setting accumulation of heat can decrease 80% .
Light qualitative firebrick basically includes brick of light qualitative clay, light qualitative tall aluminous brick and light qualitative silica brick. The production methods of light qualitative firebrick basically has 3 kinds: (1) can light additive way, join sawdust or anxious pink to wait in composition namely combustible can burn material. When can light material to be in when the brick burns in combustion process, a large number of hole can leave in the brick. This is commonly used method (2) bubble law, join colophony black to wait for blowing agent in composition namely, next firing and poriferous product (3) chemical law, certain material is joined in composition, can produce bubbly chemical reaction. For example, dolomite or square magnesian gesso, with rare vitriolic for foaming agent, generation is many, cast instantly shape, dry hind burn. The firebrick of the fireproof sex of light qualitative firebrick and general and same material differs not quite, load softening point slightly low. If pledge the brick is used for a long time below high temperature gently, can continue agglomeration and systole, cause break to damage even. Accordingly, most light qualitative brick has the problem of highest use temperature. For example, the use temperature of brick of light qualitative clay has 1000 ℃ left and right sides only, the use temperature of light qualitative tall aluminous brick does not exceed 1350 ℃ , light qualitative Molaishi ℃ of use temperature 1200-1650, the use temperature of light qualitative silica brick can amount to 1400 ℃ many degrees. Because light qualitative silica brick is nonexistent high temperature is contractive problem, volume is relatively steady, can use at build by laying bricks or stones to build the line build by laying bricks or stones that enrages direct contact with furnace. Of light qualitative firebrick be able to bear or endure broken bits sex is poorer, because this light qualitative firebrick cannot contact melt directly,the metal is mixed slaggy. The mechanical intensity of this brick and wearability also are differred slightly, do not apply to high speed air current erodes and the position with larger vibration. Sort of light qualitative firebrick is various, density of common ground use temperature, bulk and product figure cent are two kinds; (1) is classified according to body density; Bulk density is the light qualitative brick of 0.4~1.3g/cm3; 0.4g/cm3 exceeds light qualitative brick below; (2) presses use temperature classification; 600~900 ℃ pledges gently for microtherm brick; 900~120 ℃ is in lukewarm light qualitative brick; 1200 ℃ above pledges gently for high temperature brick; The production methods of light qualitative firebrick is different from general and compact material, basically have burn ash to join law, bubble law, chemical law, porous material standard to wait. 1) burns ash to add a way; Say to be able to be lighted again add a way; The combustible that burns ash easily is joined in bricky mud, the bits that be like charcoal, sawdust, there is certain air hole after making a product firing; 2) bubble law; Foaming agent is added in bricky mud, toilet soap of the toilet soap that be like a pine, bubble through mechanical method, firing hind acquire poriferous product; 3) chemical method; Use the chemical response of gas of can proper generation, poriferous product is acquired in the process that make a brick, use dolomite or square magnesian plaster stone normally, vitriolic as foaming agent; Standard of 4) porous material; Light qualitative firebrick uses natural diatomite or the porous raw material such as hollow ball makes grog of man-made clay bubble, alumina or zirconia. Material of construction of body of heater uses thermal conductivity the light qualitative firebrick with low, small thermal capacity, but managing specific fuel consumption; Raise equipment to manufacture efficiency; It still can reduce weight of body of heater, simplify kiln system structure, improve product quality, drop environmental temperature, improve labor condition; Light qualitative firebrick basically uses as liner or kiln body heat-insulation layer, heat-insulation layer. The main function of heat preservation brick is heat preservation, reduce prediction of a person's luck in a given year of quantity of heat. Heat preservation brick does not contact blaze directly commonly, firebrick contacts blaze directly commonly. The main distinction of heat preservation brick and firebrick is as follows: 1. Heat preservation function. The coefficient of thermal conductivity of heat preservation brick is 350 ± in 0.2-0.4(average temperature commonly 25 ℃ ) W/m.k, and the coefficient of thermal conductivity of firebrick is 350 ± for 1.0(average temperature 25 ℃ ) W/m.k. 2. Fireproof sex. The fireproof sex of heat preservation brick is in 1400 degrees commonly the following, the fireproof sex of firebrick is in 1400 degrees of above. 3. Density. Heat preservation brick is light qualitative insulation material commonly, density is 0.8-1.0g/cm3 commonly, firebrick density is in basically 2.0g/cm3 above. Generally speaking, firebrick machinery intensity is high, service life is long, chemical stability is good, do not have chemical reaction with material, high temperature resistant the gender is good, highest heat-resisting temperature can amount to 1900 ℃ . Special apply to fertilizer plant discretion lukewarm commutation furnace, change canister of converter of furnace, hydrogenation, to decoke, firedamp to turn heat, dispersive gas fluid arrives since, prop up, the action that enclothe and protects activator. The hot-blast stove that also can be used at steely industry and heat shift device. Firebrick has density tall, intensity tall, wear-resisting, corrosion resistance is good, hot coefficient of expansion is small, abrade efficiency low, service life grows tall, noise, the advantage such as material of free from contamination. It is a kind of high grade and abrade medium that applies to all sorts of abrade machinery. Firebrick and heat preservation brick have very big different, their use environment, limits and different also. Different material will be used at different position. When buying material, should decide according to the actual condition of kiln furnace which kinds of fireproof material suits ourselves to use.
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