Commonly used aluminium and aluminium alloy fuse furnace basically has furnace of reverberator, crucible and inductive stove. The fusible heat that at present aluminous treatment industry uses our country basically is reverberator, because its have a capacity big, thermal efficiency tall, operation is apt wait for an advantage.
As aluminous fusible furnace ceaseless and large change and of aggrandizement smelt carry out, fireproof to liner material raised more slashing requirement, consequently urgent need uses the function of fireproof material to undertake improvement to fusible furnace. With checking data mar and the pollution to aluminous fluid.
Although the operation temperature of aluminous fusible furnace has 800-1000 ℃ only, the temperature that compares steely smelt is low much, but because metallic aluminium and aluminium are medium alloying element is very lively, they generate corresponding oxide easily with reaction of fireproof material composition not only, and metallic aluminium and aluminium alloy solution penetrate the air hole in entering fireproof material composition easily inside, produce special degenerative layer, in temperature structure of the generation below fluctuant condition flakes, cause fireproof material to be marred too quickly.
Among them, the osmosis of aluminous fluid and aluminium alloy solution brings about fireproof material composition to flake is the main reason that fireproof material crosses fast attaint inside aluminous fusible furnace. Penetrate the air hole in entering fireproof material composition when aluminous fluid or melt aluminium alloy inside later, the quality that makes not only is affected, and bring about lining metamorphism, loose and it is very easy to make area be osmoticed becomes special be corroded by concussion shedding, this can bring about fireproof material to was not permeated the part is eroded further by chemistry.
Keeping clear of without mechanical action changed fireproof material (part be osmoticed) below the circumstance, because heat up temperature gradient,meet, and make chemistry is eroded slow and stop. But the coefficient of expansion as a result of hypostasis layer and degenerative layer and stretch model quantity different, in temperature fluctuant circumstance falls, parallel crackle heats together with respect to meeting generation below the action in thermal stress. In heating up a loop for many times, meet those who bring about a structure to flake happen, this kind of structure flakes can accelerate fireproof material significantly mar.
Design respect regard character from material, add the constituent that can effective limitation permeates to the middle of burden, wait to be able to raise fireproof material to fight the function that the structure flakes greatly like black lead, SiC, Si2ON2, Si3N4, B4C, BN.
Optimize through pledging to corundum fireproof material grain undertakes and right amount deserve to be not oxide, choice high quality bond, use high-pressured take shape, can acquire property relatively the compound corundum of beautiful is qualitative fireproof material (goods) . These high-powered compound corundum pledge goods is used at fusible furnace, can restrict aluminous fluid to permeate, reduce a structure to flake mar, improve fireproof material service life.
Had been informed now, optimize through undertaking to fireproof material particle size distribution and the application of small pink, make aperture of average energy of life do not exceed 0.5 μ M (the critical and stomatic diameter that does not exceed aluminous fluid to permeate) and the fireproof stuff with low air permeability can restrict aluminous fluid to permeate.
According to the product of place fuse and operation condition, think fusible furnace liner is fireproof material can choose SiO2-Al2O3 simple fireproof stuff. The alloying element in considering metallic aluminium and aluminium alloy has very strong reductive capacity to SiO2, should choose the SiO2-Al2O3 with Al2O3 high content consequently simple fireproof stuff (if aluminous alumina pledges,fireproof material and corundum pledge fireproof material) . On constituent structure, should make air permeability the tall aluminium that low, stomatic diameter is less than 0.5um is qualitative fireproof material, can suit with the use condition photograph of fusible furnace namely.
Get Price
WhatsApp