Leben alumina sare

A. High alumina brick application

Mainly used for lining of blast furnaces, hot blast furnaces, electric furnace tops, blast furnaces, reverberatory furnaces, and rotary kilns. In addition, leben alumina sare ahs are also widely used as open hearth regenerative checker bricks, plugs for pouring systems, nozzle bricks, etc. However, the price of high alumina bricks is higher than that of clay bricks, so it is not necessary to use high alumina bricks where clay bricks can meet the requirements. To

B. Performance of high alumina bricks:

(1) Refractoriness

Dib-u-dhiska lebenka alumina ee sarreeya ayaa ka sarreeya kan lebenkii dhoobada ahaa iyo lebenkii silica-silica ahaa, oo gaaray 1750 ~ 1790 ℃, oo iska leh agabyada jajaban ee horumarsan. Refractoriness waxaa inta badan saameeya content, nooca iyo tirada Al2O3, iyo refractoriness kordhay sida content ee Al2O3 kordhay.

(2) Load softening temperature:

Sababtoo ah lebenkii alumina sare lahaa Al2O3 sare, wasakhda oo yar, iyo jirrada galaaska yar oo la suuxin karo, heerkulka jilicsanaanta culayska ayaa ka sarreeya kan lebenkii dhoobada ahaa. Si kastaba ha ahaatee, sababta oo ah kiristaalo mullite ma samaysmaan qaab -dhismeed shabakad, heerkulka jilicsanaanta culeysku weli ma sarreeyo kan lebenka silica ah.

(3) Thermal conductivity:

Lebenkii alumina ee sareeyey waxay leeyihiin tabar -kuleyl ka fiican lebenkii dhoobada. Sababta ayaa ah in ay yar yihiin wejiyada galaaska oo leh kuleyl aad u hooseeya oo ku jira alaabada alumina-sare, halka tirada mullite iyo cryundals corundum oo leh tabar-kuleyl ka wanaagsan ay sii kordhayaan, taas oo hagaajinaysa tabinta kuleylka ee badeecada.

(4) Thermal shock resistance:

Iska caabbinta naxdinta kuleylka ah ee lebenkii alumina sare wuxuu u dhexeeyaa alaabta dhoobada ah iyo alaabada silica leh. Wareegga qaboojinta biyaha ee 850 ° C waa 3 illaa 5 jeer oo keliya. Tan waxaa ugu wacan xaqiiqda ah in corundum ay leedahay ballaarinta kuleylka oo ka sarreeya mullite iyada oo aan la beddelin kristal. Waqtigan xaadirka ah, waxaa suurtogal ah in la hagaajiyo qaab -dhismeedka walxaha alaabta, la yareeyo waxyaabaha ku jira budada ganaaxa ah, lana kordhiyo cabbirka walxaha muhiimka ah iyo darajaynta walxaha ee clinker si loo hagaajiyo iska -caabbinta naxdinta kuleylka ee sheyga.

(5) Slag resistance:

Lebenkii aluminaha sare lahaa Al2O3 dheeraad ah, kaas oo u dhow agab cillad dhexdhexaad ah, oo iska caabin kara nabaad -guurka ee wasakhda aashitada iyo slag alkaline. Sababtoo ah ka mid noqoshada SiO2, kartida iska caabbinta wasakhda alkaline ayaa ka daciifsan tii dhoobada aashitada. Intaa waxaa dheer, iska -caabbinta dhoobada ee lebenkii alumina sare waxay sidoo kale la xiriirtaa xasiloonida badeecada ee dhoobada. Guud ahaan marka la hadlayo, ka dib marka wax-ka-beddelidda cadaadiska sare leh iyo dabka heer-kulka sare leh, badeecadaha leh porosity-ka hooseeyaa waxay leeyihiin iska-caabbinta dheecaanka sare.

The parameter index of high alumina bricks varies widely, and its physical properties should be determined according to the grade of the product and the place of use when it is used. At present, the general high alumina brick standard GB2988-88 is generally adopted. If you need to use super high alumina bricks, please refer to GB/T 2988-2012 standard physical and chemical indicators. The index of high alumina brick is the basic performance requirement. According to the conditions of use, creep resistance and thermal shock resistance should also be considered. The chemical resistance directly depends on the A12O3 content and porosity.

(6) Physical and chemical indicators: