Brick of light qualitative corundum, light qualitative corundum not comes Shi Zhuankang flakes the gender is strong. Bulk density is 1.5-1.7g/cm3, basically use as kiln of high temperature channel. Temperature of drawer kiln liner can be as high as 1700 ℃ , density of bulk of brick of liner of kiln of path of roller of brick of heat preservation of kiln of high temperature channel, ejector plate kiln is 1.3-1.4g/cm3.
As a result of its production methods and introduced additive differ, the content of Al2o3 also differs somewhat. Generally speaking, by the firm additive that burn ash law, bubble law changes legal system to become firebrick of light qualitative corundum compatibly. Al2o3 contains dizzy quantity not to exceed 99% commonly, al2o3 content by corundum hollow ball is made.
Polystyrene bubble bead kind use polystyrene bubble bead serves as the additive that burn ash. Polystyrene bubble bead light corundum brick of production is polystyrene bubble bead joins corundum mashed vegetable or fruit by certain proportion in, secure through shaping in adobe, even ball hole leaves in the product, make the brick makes poriferous structure, reduce density. Because ball bead is basic not bibulous, blank water content is low after shaping, the product is dry be out of shape small, finished product size is exact, do not need to grind a brick to recombine, the product can satisfy dimension requirement. If use polystyrene,bubble bead serves as the exclusive additive that burn ash, although it is not bibulous, dry systole is small, but cannot give help deliver water, adobe is in dry process the surface is dry, in-house water cannot move, very easy craze. Contradict to solve this, use the compound additive that burn ash commonly, add the bibulous substance that burn ash namely, the help delivers water, prevent bricky craze, use sawdust and polystyrene bubble commonly bead, should use fine wood chip, also fill bead clearance, reduce firebrick density. Use odd polystyrene bubble bead, combustion hind forms larger air hole, but all round for heavy-duty and compact material, constituent structure is unreasonable, grind a brick to be transformed hard; The compound additive that burn ash can make the large air hole all round light corundum brick, constituent structure is more reasonable. Join right amount the corundum fine pink of 0 ℃ to calcine and alumina ball crocus, join right amount compound burn more than additive and bond.
Oscillatory or pouring shape, burn in 1690 ℃ . This product burns in channel kiln, temperature is 1520 ℃ , heat preservation 8 hours. This product is fluctuant between 10%~13% . The product after combustion should be according to the appearance of firebrick and dimension on cut machine and polisher mix into travel cut abrade.
What be used successfully at transformer steel heat treatment is hydric the annealing furnace liner that serves as medium, with the furnace of likeness of etc use condition, by the brick of light qualitative corundum that burns ashes to curium wood chip and Cao are made.
What is the raw material of brick of light qualitative corundum performance of heat preservation of brick of general light qualitative heat preservation is good, high temperature resistant performance is poor; Hollow ball brick has alumina good high temperature resistant quality, but its photograph composition basically is corundum photograph, thermal stability under Molaishi. Adjust and improve alumina of hollow ball brick high temperature resistant function and high strenth base arsenic. It is main material with corundum, added Mo Laishi part, developed corundum to give priority to brilliant photograph, yinglaishi pledges gently for corundum Mo Laishi heat preservation brick.
Raw material is main raw material with high-grade corundum, join partial α - clay of tall plasticity of Al2O3 and low speed railroad, high temperature produces partial Mo Laishi, give priority to brilliant photograph with corundum, mo Laishi is assorted photograph, join raw material of Lan Jing stone to be expander, the volume after ensuring the product burns is steady, plasticity shapes. Corundum Mo Laishi pledges the brick is gently in can burning the portion such as ball of wood chip, polystyrene, coke material to add burden. When combustion, can burn air hole of the generation after material burns, reduce bulk density of the brick thereby. This kind of method can make the light qualitative brick with bulk density lesser requirement. Additive combustion thing is wood chip and polystyrene ball. 1mm of wood chip classics is chosen, without foreign matter; 2~0.5mm of polystyrene ball diameter, exterior whiteness, grain is even. Burden not comes by light qualitative corundum stone brick recipe undertakes. When burden, join corundum, alumina, clay and expander mixer in proportion, dry mix 3-5min, join combustible and adhesive next (adscititious) , the edge joins edge agitate, mix is even, boil next.
The formation of light qualitative brick mixes corundum firing one, shape. Corundum Mo Laishi pledges the brick basically uses crowded mud law to shape gently. The recipe of this product needs to check repeatedly. In producing a course, squeeze first give an adobe, detect bulk density of the brick. The combustion gage after more ground burns calculates the bulk density of finished product brick. This method detects for adobe bulk density method. Bulk density detects after qualification, can throw production. If system is secret,detect unqualified, can roll in time, join combustible or mixed powder, qualification hind continues to produce. The adobe body close percent of pass that detects with this method is tall, density of finished product bulk is inside requirement limits. The wet base after shaping is dry below 50~60 ℃ 24 hours; After 100~110 ℃ dry 48-72 hour, dry hind ≤ of moisture of adobe center remain 2.0% . 2, firing. After adobe is dry, with shuttle kiln fire. Adobe is ground beforehand before loading of kiln, put adobe into feet according to combustion shrinkage, the grinding that can reduce combustion hind is used up, managing raw material, increase amount of loading of kiln. Side is used to install a method when loading of kiln, be helpful for eliminating the combustible when combustion. When loading of kiln, adobe is placed even, igneous method is uniform. Combustion temperature control is in 10 ℃ of 1600 ± , heat preservation 8h. Combustion process is a few what should notice mediumer: (1) combustion is earlier, especially 300~600 ℃ is combustible combustion phase, need is slow warm up, those who be helpful for combustible discharge, otherwise combustible is met carbonization, bricky experience blackens. (2) in heat preservation phase, answer to ask to have thermal insulation according to the curve. The difference in temperature when heat preservation should small. Because pledge the brick has favorable heat preservation effect gently, cause local temperature easily, because this assures all temperature dot,heat preservation begins inside limits of heat preservation temperature. (3) cooling phase, cooling rate shoulds not be too fast, cause a brick easily to crack otherwise. 3, cold working. The blank after combustion can grind the brick that becomes different figure and measure according to asking to grind. Abrade the bricky form after is regular, size is exact. The corundum Mo Laishi that produces with this kind of method is light adiabatic brick, can ask to make the brick of the complex exterior of all sorts of appearance and different figure according to the user, ensure size is exact. Mo Laishi of finished product corundum pledges bricky exterior quality inspection and manage change function to examine gently, exterior whiteness, edges and corners is trenchant, size is exact.
The thermal conductivity as a result of light qualitative brick and intensity under compact brick, its fight thermal shock function to also be reduced significantly. Hole rate is older, reductive is more. The brick of combustion grey additive, especially grain material, lighter than bubble qualitative brick has better heatproof shake performance. However, the firebrick of light qualitative corundum of many standard measure (65mm of × of 230mm × 120mm) be heated 1300 ℃ , the instrument endures 1-2 second heat to exchange, get used to use condition hard. In the meantime, affirm the bulk that forms break and broken part in cooling initial stage increases, improved the heat proof quality of firebrick of light qualitative corundum. Pledge corundum brick burns in 1750 ℃ gently partly, hole rate is 39% , 142% , 142% , after 1750 ℃ 3 hours burn rudimental systole to be 0.52%11.8% again; Bubble law and the brick of light qualitative corundum that additive law produces combustion ash are after 1740 ℃ 2 be less than 0.5% . The combustion temperature of firebrick blast fall to 15201580 ℃ , rudimental systole comes 150 ℃ . Below high temperature, light corundum brick is opposite also to the reductive gas such as hydrogen, firedamp stable, liner of bright fire annealing furnace suffers hydrogenous medium to protect, can use light corundum extensively fireproof material, also can use at gas of carbon black reactor and liner of air intake air heater.
Get Price
WhatsApp