The electric frit corundum of in use and agglomeration corundum call chromic corundum brick chromic corundum brick.
Usually, aluminous content calls corundum the brick in 90% above. Chromic corundum brick is to point to brick of agglomeration chromic corundum commonly. In &α; with - Al2o3 is raw material, join chromic pink of right amount oxidation and white of chromic corundum grog, after shaping, high temperature fire and into.
The formation of chromic corundum brick, composition and function.
1, fireproof function
By Al2O3-Cr2O3 n duality phasor is knowable, al2O3 and Cr2O3 can fashion successive solid solution, and not low in all frit products is crude. Because this is in high pure Cr2O3 is joined to add a capacity no matter in corundum material how many, the fireproof performance that won't reduce material division not only makes the fireproof function of material rises somewhat instead. What chromium just pressed a brick is fireproof degree (> 1790 ℃ and loading bate temperature (> 1700 ℃ ) all excel is high pure corundum brick.
2, compression intensity
High pure the intensity of normal temperature compression of corundum brick is 70~100MPa commonly, the strength of normal temperature compression of brick of high-powered chromic corundum is general > 150MPa, its strength is apparent brick of prep above corundum. Because goods is in,this is firing in the process, between its grain and grain, between grain and fine pink, al2O3-Cr2O3 solid solution all was fashioned between fine pink and fine pink, this solid solution joins grain, fine pink together like the bridge make the intensity of material rises greatly.
3, thermal shock stability
According to data report, cr2O3 is joined in corundum, when Cr2O3 content is 10%~66% , the thermal shock stability of material is reduced along with the addition of Cr2O3 content, namely the chromic corundum brick with Cr2O3 low content, stability of its thermal shock is good at the chromic corundum brick with Cr2O3 high content. Content of Cr2O3 of brick of high-powered chromic corundum is between 12%~20% , the additive that stability of its thermal shock raises; to join a few generation to change especially somewhat than corundum brick and brick of the AKZ that production gives chromic corundum, thermal shock stability more actor.
4, fight broken bits to erode ability
All sorts of fireproof material oxide are in melt is cindery medium solubility. Cr2O3 is in coal aerification slag (SK)2-CaO is fastened) the solubility in reaching all sorts of glass fuse-element wants than the solubility of other oxide material small much. Consequently Cr2O3 or the fireproof material that contain Cr2O3 are had fight aerification of broken bits of smelt of slag, coloured, coal goodly slag of slag, oily aerification and all sorts of glass fuse-element earth up corrode ability. The fluid photograph viscosity that Cr2O3 fuse-element or Cr2O3 and slag reaction generate is compared other viscosity of low frit content is big, this prevented fine stoma of slaggy edge wool to be permeated to bricky system interior, avoid to form degenerative layer and produce a structure to flake.
Chromic corundum brick is to use aluminium reductive Cr2O3 and a kind of product that makes. It is equivalent to pure corundum (or Bai Gangyu) the pure Cr2O3 that 10% above join after melt and a kind of when make compound and fireproof material. As a result of among them the content of Cr2O3 is high and be united in wedlock with corundum matrix, call chromic corundum brick so. Chromic corundum brick wants to pass the high temperature smelt of 2000 ℃ above in producing a course, its composition is relatively even, because have wonderful thermal stability and stability of high temperature chemistry. It is the chemical composition of chromic corundum brick below
The density of chromic corundum brick is 3.1g/cm³ : Cubage density 1850~2100Kg/m³ : Mohs hardness is 9: Microscopical hardness 2190~2270Kg/mm² : Those who heat up coefficient of expansion to be quartz about is general: What thermal conductance is quartz is duple, the melting point of chromic corundum brick is 1830~2000 ℃ .
The use method of cupola of build of chromic corundum brick
The speed that slag and metallic fluid erode lining and the square that lining material space leads become direct ratio. Accordingly, high density is one of crucial factors that improve lining life. The rate of hole of chromic corundum brick with the caky refrigeration after melt is the minorrest, consequently the crucial position of body of heater uses build by laying bricks or stones of chromic corundum brick to build, pink of the corundum that use chromium adds aperture of brick of binder fill and level up.
Life of lining of chromic corundum brick
With cupola of build of chromic corundum brick, open furnace time every time average 7 hours, change iron 12~14t on average. Heavy repair 3 times only eventually in last few years in what already used, average furnace life 350, and with common firebrick gold can use 2~3 second change a brick with respect to beard overhaul, building cupola lining life with build by laying bricks or stones of chromic corundum brick consequently is the centuple above of common firebrick, reduced the workload of worker furnace repair greatly thereby, also reduced manufacturing cost substantially at the same time. Because lining pole is able to bear or endure erosive, make furnace preserve original design from beginning to end appearance is changeless, can make molten iron gives furnace temperature to maintain consequently in 1450~1500 ℃ changeless. In addition, as a result of need not furnace repair can use stew furnace technology, simplified to manufacture technology greatly thereby, avoided to begin the cold molten iron that when fusing, appears.
The content of chromium of the oxidation in brick of agglomeration chromic corundum is common the content under chromium of the oxidation in brick of founding chromic corundum.
OK also by slop pouring method, α alumina powder and oxidation chromic pink mixes even, add the one share of chromic corundum grog, this is to form bricky grouting method.
Brick of corundum of electric frit chromic zirconium calls AZCS the brick again, use without contractive foundry technology. Bricky skin and interior are bottle green. Melt brick contains 4.5% shrinkage cavity, without join stoma.
Furnace of coloured glass kiln can use the AZCS brick step that contains Cr2O3 to build Chi Bi, those who raised Chi Bi be able to bear or endure corrode sex.
Corundum advocate brilliant photograph is (Al2-xcrx)O3. Vitreous photograph quantity and brick of AZS of average report frit are similar, pass small divisional analyse, decided the chemical part of vitreous photograph. Dissolved in glass many Cr2O3, the chromic ion that forms structure of glass is by appraisal Cr2+ . That is to say, cr3+ is reductive in fuse-element for Cr2+ . Because fuse-element is in relatively reductive air,this is in.
The strength of normal temperature compression of brick of agglomeration chromic corundum is general > 100MPa, its strength is apparent brick of prep above corundum. Because goods is in,this is firing in the process, between its grain and grain, between grain and fine pink, al2O3-Cr2O3 solid solution all was fashioned between fine pink and fine pink, this solid solution joins grain, fine pink together like the bridge make the intensity of material rises greatly.
Application of brick of agglomeration chromic corundum reachs ascendant place at the flue of fibre glass pool, in industry of nonferrous metal, glass tall erode place.
The osculatory glass place such as bottom of the Chi Bi of adiabatic glass cotton and kiln of frit of cliff cotton fiber, pool, passageway is useful brick of agglomeration chromic corundum. Still have pottery and porcelain furnace of kiln of frit piece frit gives makings opening, metallurgy bath and converter coming back; Zinc oxide is fused incinerator of furnace, rubbish.
Current, the application of chromic corundum brick is relatively wide already, basically use at platform of slip of carbon black furnace, steel rolling furnace, steel. Have good thermal stability and property of high temperature creep.
Brick of agglomeration chromic corundum applies extensively at brick of glass of cover board of vitreous kiln line, throat, body of kiln of fibre glass kiln and uptake, corrode wall of kiln of the stained glass kiln of place, adiabatic fibre glass badly, below the support of furnace of aerification of pressurization of oar of coal of equipment of pretreatment of the molten iron before bottom and furnace, water, the metallurgy bath of mouth of discharge of kiln of glair of pottery and porcelain and rotary kiln, zincic fusion furnace.
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