Bases is Mo Laishi brick alumina, advocate brilliant photograph is Molaishi, its product component attachs most importance to what pledge and pledge gently (JM series) , have electric frit goods and agglomeration product, have corundum according to recipe and craft goods waits Molaishi, zirconium Mo Laishi, compound Molaishi a moment.
Agglomeration not comes the manufacturing technology of stone brick and likeness of tall aluminous firebrick. Synthesize Mo Laishi grog to be grain material, fine pink is grog of synthetic Mo Laishi, or Bai Gangyu. Pink and pure clay make quartz mix fine pink into what be equivalent to Molaishi. Grain material and fine pink cooperate in proportion. Commonly used scale is: Grain material 45%~55% , fine pink (0.088mm) 55%~45% . After mixing equably, high pressure shapes. Combustion temperature is 1550~1600 ℃ . When into Molaishi when electric fusion clinker is grain material, combustion temperature should be more than 1700 ℃ .
Mo Laishi brick is the silicon aluminous system that gives priority to brilliant photograph with Molaishi fireproof product. Because electric frit not comes of stone brick advocate brilliant photograph Mo Laishi, fireproof sex of Mo Laishi is 1850 ℃ about, load bate temperature is high, rate of high temperature creep is low, heat-resisting shake is good, acid-proof sex is eroded. Electric frit not comes stone brick is raw material with tall bauxite, will different land mine makes Molaishi (3Al2o3.2SiO2, quality per cent is Al2o372%.SiO228%) . In 2300 ℃ the left and right sides fuses, below 1850 ℃ casting enters sand mold, next anneal eliminates stress. Advocate brilliant photograph is Molaishi and corundum, vitreous photograph fill is between brilliant photograph. Its are able to bear or endure vitreous fluid aggressivity is strong at agglomeration fireproof material, but not as fireproof as other report frit material. Join a few (2 zirconia of 7%~8.5%) , can make not come decrescent of stone brilliant photograph, bricky organization is compact, the quantity increases Mo Laishi to 60%~70% , reduce vitreous appearance content relatively, reduce product crackle. Mo Laishi brick heats up electric frit coefficient of expansion is small. Hear resistance is good. Be able to bear or endure vitreous fluid aggressivity is strong. Production report frit not comes when stone brick, precipitate in cooling process above all corundum crystal, precipitate next Mo Laishi crystal. A few SiO2.Al2O3.Fe2O3.Cao.Mgo.Na2O that remain make vitreous appearance. 25% what vitreous photograph takes a brick. It contains material of a lot of low melting point, its corrosion resistance is accordingly poorer than brick of other report frit. There still are bleb and reductive material in vitreous photograph, the meeting when using pollutes vitreous fluid. Mo Laishi brick is unfavorable basic material is contacted in 1450 ℃ above, can decompose Molaishi otherwise. Below the reductive atmosphere of 1370 ℃ above, mo Laishi also can be decomposed, partial SiO2 can become gaseous SiO, leave bricky put oneself in another's position. When temperature prep above when 1650 ℃ , mo Laishi although not reducing atmosphere, also can press next decomposing in inferior oxygen cent.
Density of bulk of firebrick of light qualitative Mo Laishi is less than the light qualitative firebrick that is equal to 1.3g/cm3, because its coefficient of thermal conductivity is low, energy-saving effect is better, can regard the kiln furnace that contacts blaze directly as liner, but temperature of bate of loading of existence of general light qualitative firebrick is low, burn systole to wait for a problem greatly again, use as heat preservation heat-insulating material more consequently, and the light qualitative firebrick with a few good high temperature capability, manufacturing cost is high, price of this kind of light qualitative firebrick is high, the user is accepted hard again. My company foundation market demand, development went light qualitative Molaishi brick, the industry such as pottery and porcelain, chemical industry, metallurgy to raise economic benefits, to the light qualitative Molaishi with price moderate, good performance firebrick demand increases, make firebrick of this kind of light qualitative Mo Laishi received wide application on liner of its kiln furnace.
Low heat conduction is multilayer and compound Mo Laishi brick this firebrick by working layer, thermal insulation, adiabatic layer 3 parts are formed, use synchronism to shape, synchronous and firing craft. Working layer uses electric frit grog of alumina of Molaishi, leveling, high grade andalusite, reach additive to wait, have stronger fight alkaline erode ability, good
High temperature resistant function, excellent heatproof shake stability and high temperature intensity. Heat-insulation layer uses special technology Mo Laishi complex raw material and bond, and zigzag each other sets type structure, make its bigger of the area contact with working surface, increase combinative strength, in this kind special construction falls, compression intensity achieves 75Mpa, and coefficient of thermal conductivity is low (≦ 1.5W/(m.k)1000 ℃ ) , rose very well to support working layer and the action that prevent heat to deliver. Thermal insulation uses coefficient of thermal conductivity to exceed material of low heat conduction to be made character under the zirconium of 0.03W/(m.k)350 ℃ , density is small, adiabatic the effect is good.
Low heat conduction is multilayer and compound Mo Laishi brick because its unique multilayer and complex structure, getting used to a series of complex physico-chemical change premise inside kiln to fall, lowered integrated coefficient of thermal conductivity again, assured to be used of the brick normally already, reduce coal consumption again, drop cylindrical shell temperature, at the same time effective protective tug and cylindrical shell do not suffer high temperature influence to be out of shape, and lighter than traditional product weight 15% , transfer in 5000T/D rotary kiln take service life to achieve 12 months above, cent ungird arrives 5 years. Pass the material composition of working layer and heat-insulation layer. Study the combinative method of preparation craft and interface and combinative strength, use synchronism to shape. Synchronous combustion technology was solved multilayer composite material coefficient of expansion does not match the high temperature craze that cause, be out of shape, fall off wait for a problem, increased the thermal conductivity of the product and thermal shock stability; Use zirconium fireproof fiber serves as thermal insulation, optimize a structure, reduced a state effectively fireproof material quality supervises examine the integral material coefficient of thermal conductivity that the center checks: When 1000 ℃ , working layer coefficient of thermal conductivity (laser method) for 2.69W/ (Mk) . Heat expands 0.54% , heat-insulation layer coefficient of thermal conductivity (laser method) for 1.58W/ (Mk) , coefficient of thermal conductivity is 0.61% .
The Al2O3 content that composition can determine according to use condition will decide, at present common composition method has: ① synthesizes Molaishi (agglomeration or electric frit) for aggregate + synthesize Mo Laishi fine pink; ② synthesizes Molaishi (agglomeration or electric frit) for aggregate + synthesize Mo Laishi fine pink + Al2O3 fine pink + high pure argillaceous pink; ③ synthesizes Molaishi (agglomeration or electric frit) with electric frit Bai Gangyu is aggregate + synthesize Mo Laishi fine pink + Al2O3 fine pink + high pure argillaceous pink. Size is larger than should pressing two end, intermediate small principle preparation. Waste liquid of sulphurous acid pulp or aggregate chloridize aluminium or get together more phosphate regards combination as the agent. Mix even hind, high pressure shapes, burn in high temperature kiln. Combustion temperature depends on the content of the Al2O3 in firebrick, it is commonly between 1600~1700 ℃ .
Mo Laishi brick contains the foreign matter oxide such as Tio2.Fe2o3.Cao.Mgo.K2O and Na2O normally, the prep above of Mo Laishi matter content that natural raw material produces synthesizes raw material. These foreign matter oxide have flux effect in Molaishi, the formation that reduces frit fluid temperature and viscosity, increase the generation of fluid photograph, raise frit fluid to be opposite the deliquescent speed of solid photograph and deliquescent quantity. However, the action intensity of oxide of every kinds of impurity is different, among them the impact that K2O and Na2O form temperature to fluid photograph is big, k2O and Na2O will not have variable to nod temperature to reduce 513~724 ℃ respectively, decompose Molaishi at the same time. In these foreign matter oxide, the impact of TiO2 is little, have 101~107 ℃ only just can reduce without variable dot temperature.
When TiO2 content is inferior, dissolve besides partial solid finite solid solution is fashioned in Molaishi, of stimulative Molaishi make He Jing system outside growing, still a few vitreous body enter fluid phase below high temperature. Below high temperature, fe2o3 has certain solid solubility in Molaishi and corundum, form finite solid solubility. Mo Laishi of its solid solubility prep above in corundum. As a result of the formation of solid solution, mo Laishi and the crystal lattice of corundum grow. Fe2O3 to A12O3 one SiO2 is material only then the ratio of the content of the A12O3 in frit temperature and system or A12O3/SiO2 is concerned. It is when the ratio of A12O3/SiO2 2.55 when, only then frit temperature is 1380 ℃ . If the ratio of A12O3/SiO2 > 2.55, criterion only then frit temperature will lift 1460 ℃ , and as the content of A12O3 lift gradually. Restoring atmosphere to fall, fe2O3 is restored vitreous photograph.
In short, as content of A12O3 of Mo Laishi brick rise, its high temperature capability rises; Fuse-element dosage increases, high temperature capability is reduced. Accordingly, control the content of foreign matter oxide strictly, especially K2O.Na2O and content, it is the important step that achieves firebrick of high-powered Mo Laishi. Teach uses at containing alkaline part slaggy or gas, have to stone material firebrick erode action badly.
Mo Laishi brick passes zirconium to introduce Zro2 to come to those who improve Molaishi to organize a structure in A12O3-SiO2 department brick, can raise Molaishi fight sex of shake of chemical aggressivity, heat-resisting and coefficient of expansion. This kind contains the Mo Laishi brick of Zro2, call zirconium normally Mo Laishi brick, use electric frit legal system to become commonly, also use agglomeration legal system to become. Agglomeration zirconium not comes stone brick is a kind of special fireproof material, make by industrial alumina and zirconium stone concentrate, introduce zirconia Mo Laishi matrix through reaction agglomeration craft. Introduce zirconia Mo Laishi brick, the photograph that uses zirconia changes tenacity, the high temperature that can raise Mo Laishi material greatly is mechanical function. Zirconia can promote the agglomeration of Mo Laishi material. The affiliation of Zro2 can accelerate the compact agglomeration process of ZTM material, because of the formation of low melting point and room. It is when the quality mark of Zro2 30% when, the relatively theoretical density of the base substrate with 1530 firing ℃ achieves 98/2, tenacity achieves 98/2.
Corundum of Mo Laishi brick not comes to corundum stone brick is by corundum and Molaishi advocate the tall aluminous firebrick that brilliant photograph comprises. Corundum not comes stone brick is the firebrick that shows by tall purity or purity raw material is made. The existence of impurity of oxide of low melting point will reduce its high temperature capability. Corundum not comes the price outclass of stone brick is common tall aluminous brick. Function: Have good high temperature intensity, high temperature resistant creep sex, heat-resisting shake sex and corrosion resistance. The manage of Mo Laishi brick changes typical corundum function is: Al2o3 ≥ 85% , fe2o30.45% , the rate that show hole 19% , intensity of room temperature compression is more than 55mpa, bate temperature is more than 1700 ℃ , add a hot line to change (1600 ℃ , 3h) - 0.1% , heat-resisting shake (1100 ℃ water-cooling) be more than 30 times.
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