Yakakwirira alumina zvidhinha

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, yakakwirira alumina zvidhinhas 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

Iko kudzvanyirira kweakakwira alumina zvidhinha kwakakwirira kupfuura izvo zvevhu zvidhinha uye semi-silika zvidhinha, inosvika 1750 ~ 1790 ℃, iri yemhando yepamusoro yekuratidzira zvinhu. Iyo Refractoriness inonyanya kukanganiswa nezviri mukati, mhando uye huwandu hweAl2O3, uye iyo refractoriness inowedzera sezvo zvirimo zveAl2O3 zvinowedzera.

(2) Load softening temperature:

Nekuti yakakwira alumina zvidhinha zvine yakakwira Al2O3, isina kuchena, uye isinganetsi fusible magirazi matumbi, mutoro unopfavisa tembiricha yakakwira kupfuura iya yezvidhinha zvevhu. Nekudaro, nekuti mullite makristasi haagadzi chimiro chenetiweki, tembiricha inodzikamisa tembiricha haisati yakakwira seiya yezvidhinha zvesilica.

(3) Thermal conductivity:

Yakakwira alumina zvidhinha zvine zvirinani kupisa kupisa kupfuura zvidhinha zvevhu. Icho chikonzero ndechekuti kune mashoma magirazi mafasi ane yakaderera thermal conductivity mune yakakwira-alumina zvigadzirwa, nepo huwandu hwemullite uye corundum makristasi ane ari nani kupisa mutyairi conductivity inowedzera, iyo inovandudza iyo inopisa kupisa kuitisa kwechigadzirwa.

(4) Thermal shock resistance:

Iyo yekupisa yekuvhunduka kuramba kweakakwira alumina zvidhinha iri pakati pevhu zvigadzirwa uye siliceous zvigadzirwa. Iyo inotonhorera yemvura pa850 ° C ingori katatu kusvika ka3 nguva. Izvi zvinonyanya kukonzerwa nenyaya yekuti corundum ine yakanyanya kupisa kupisa kupfuura mullite isina kristal shanduko. Parizvino, zvinokwanisika kunatsiridza chigadzirwa chechigadzirwa chemukati, kudzikisira zvirimo zvehupfu hwakatsetseka, uye kuwedzera iyo yakakosha sosi size uye kudonhedza chidimbu cheiyo clinker yekuvandudza iyo yekupisa yekuvhunduka kuramba kwechigadzirwa.

(5) Slag resistance:

Yakakwira alumina zvidhinha zvine Al2O3 yakawanda, iri padhuze nekusarerekera zvinhu zvinopesana, uye inogona kudzivisa kukukurwa kweacidic slag uye alkaline slag. Nekuda kwekuisirwa kweSiO2, kugona kurwisa alkaline slag haina kusimba pane iyo yeacidic slag. Uye zvakare, iyo slag kuramba kweakakwira alumina zvidhinha zvakare zvine hukama nekugadzikana kwechigadzirwa mune iyo slag. Kazhinji kutaura, mushure mekumanikidza kwepamusoro-kupisa uye kupisa kwepamusoro-tembiricha, zvigadzirwa zvine porosity yakaderera zvine husimbe hwekudzivirira.

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: