Setene se phahameng sa alumina

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, litene tse phahameng tsa aluminas 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

Refractoriness ea litene tse phahameng tsa alumina e phahame ho feta ea litene tsa letsopa le semi-silika, e fihlang ho 1750 ~ 1790 ℃, e leng ea thepa e tsoetseng pele e hanyetsang. Refractoriness e angoa haholo-holo ke litaba, mofuta le bongata ba Al2O3, ‘me bocha bo ntseng bo eketseha bo eketseha ha likateng tsa Al2O3 li eketseha.

(2) Load softening temperature:

Hobane litene tse phahameng tsa alumina li na le Al2O3 e phahameng, litšila tse fokolang, le ‘mele ea khalase e fokolang, mocheso o nolofatsang mojaro o phahame ho feta oa litene tsa letsopa. Leha ho le joalo, hobane likristale tsa mullite ha li thehe sebopeho sa marang-rang, mocheso o kokobetsang mojaro o ntse o se holimo joalo ka litene tsa silika.

(3) Thermal conductivity:

Litene tse phahameng tsa alumina li na le mocheso o motle ho feta litene tsa letsopa. Lebaka ke hore ho na le mekhahlelo e fokolang ea khalase e nang le mocheso o tlase oa lihlahisoa tse phahameng tsa alumina, ha palo ea likristale tsa mullite le corundum tse nang le mocheso o futhumetseng o ntse o eketseha, e leng ho ntlafatsang tšebetso ea mocheso oa sehlahisoa.

(4) Thermal shock resistance:

Khanyetso ea mocheso oa litene tse phahameng tsa alumina e lipakeng tsa lihlahisoa tsa letsopa le lihlahisoa tsa siliceous. Potoloho ea ho futhumatsa ha metsi ka 850 ° C ke makhetlo a 3 ho isa ho a 5 feela. Sena se bakoa haholo ke taba ea hore corundum e na le keketseho e phahameng ea mocheso ho feta mullite ntle le phetoho ea kristale. Hajoale, ho a khonahala ho ntlafatsa sebopeho sa phatsa ea sehlahisoa, ho fokotsa likahare tsa phofo e ntle, le ho eketsa boholo ba phatsa e nyane le ho hlophisoa ha phatsa ea clinker ho ntlafatsa khanyetso ea mocheso oa sehlahisoa.

(5) Slag resistance:

Litene tse phahameng tsa alumina li na le Al2O3 e ngata, e haufi le lisebelisoa tse sa nke lehlakore, ‘me e ka hanela khoholeho ea mobu ea acid le slagine. Ka lebaka la ho kenyelletsoa ha SiO2, bokhoni ba ho hanela slag ea alkaline bo fokola ho feta ba slag e nang le asiti. Ntle le moo, khanyetso ea slag ea litene tse phahameng tsa alumina e boetse e amana le botsitso ba sehlahisoa se slag. Ka kakaretso, kamora ho bopa khatello e phahameng le ho thunya mocheso o phahameng, lihlahisoa tse nang le porosity e tlase li na le khanyetso e phahameng ea slag.

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: