Siab alumina cib

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, siab alumina cibs 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

Qhov refractoriness ntawm qib siab alumina cib yog siab dua li ntawm cov av nplaum cib thiab cov pob zeb ib nrab silica, mus txog 1750 ~ 1790 ℃, uas yog rau cov khoom siv hluav taws xob siab. Qhov refractoriness feem ntau cuam tshuam los ntawm cov ntsiab lus, hom thiab ntau ntawm Al2O3, thiab qhov refractoriness nce raws li cov ntsiab lus ntawm Al2O3 nce.

(2) Load softening temperature:

Vim tias cov cib alumina siab muaj Al2O3 siab, tsis muaj qhov tsis huv, thiab tsis muaj lub cev iav fusible, qhov hnyav ua kom sov siab dua li ntawm cov av nplaum cib. Txawm li cas los xij, vim tias cov mullite muaju tsis tsim cov qauv network, qhov hnyav ua kom sov kuj tseem tsis siab li silica cib.

(3) Thermal conductivity:

Cov av alumina siab muaj cov cua sov zoo dua li cov av nplaum. Qhov laj thawj yog tias muaj tsawg dua cov iav theem nrog cov cua sov ua kom sov qis hauv cov khoom lag luam alumina, thaum cov naj npawb ntawm mullite thiab corundum muaju nrog cov thermal conductivity nce zoo, uas txhim kho cov thermal conductivity ntawm cov khoom.

(4) Thermal shock resistance:

Cov cua sov ua haujlwm tsis zoo ntawm cov cib alumina siab yog nruab nrab ntawm cov khoom siv av nplaum thiab cov khoom siv siliceous. Cov dej txias txias ntawm 850 ° C tsuas yog 3 txog 5 zaug. Qhov no feem ntau yog vim qhov tseeb tias corundum muaj cov cua sov nthuav dav ntau dua li mullite yam tsis muaj kev hloov pauv. Tam sim no, nws muaj peev xwm txhim kho cov khoom lag luam tus qauv, txo cov ntsiab lus ntawm cov hmoov zoo, thiab ua kom qhov loj me me thiab qhov loj me me ntawm clinker txhawm rau txhim kho cov cua sov poob siab ntawm cov khoom.

(5) Slag resistance:

Cov av alumina siab muaj ntau dua Al2O3, uas yog ze rau cov khoom siv hluav taws xob nruab nrab, thiab tuaj yeem tiv taus kev yaig ntawm cov kua qaub slag thiab cov tshuaj alkaline. Vim tias suav nrog SiO2, lub peev xwm los tiv thaiv alkaline slag tsis muaj zog dua li cov kua qaub slag. Ib qho ntxiv, slag tsis kam ntawm qib siab alumina cib kuj tseem cuam tshuam nrog kev ruaj ntseg ntawm cov khoom hauv slag. Feem ntau hais lus, tom qab txhaj tshuaj molding siab thiab kub kub, cov khoom lag luam nrog qis porosity muaj cov tshuaj tiv taus siab dua.

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: