Segondè brik 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, segondè alumina briks 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 nan brik alumina segondè se pi wo pase sa yo ki an brik ajil ak brik semi-silica, rive 1750 ~ 1790 ℃, ki fè pati materyèl avanse REFRACTORY. Refraktorite a sitou afekte pa kontni, kalite ak kantite Al2O3, ak refraktorite a ogmante kòm kontni Al2O3 ogmante.

(2) Load softening temperature:

Paske brik alumina segondè gen Al2O3 segondè, mwens enpurte, ak kò vè mwens fuzibl, tanperati a ralantisman chaj se pi wo pase sa yo ki an brik ajil. Sepandan, paske kristal mullite pa fòme yon estrikti rezo, tanperati ralantisman chaj la toujou pa wo tankou sa ki nan brik silica.

(3) Thermal conductivity:

Segondè brik alumina gen pi bon konduktiviti tèmik pase brik ajil. Rezon ki fè la se ke gen mwens faz vè ki gen konduktiviti ki ba tèmik nan pwodwi ki gen anpil alumina, pandan y ap kantite kristal mullit ak korund ak pi bon konduktiviti tèmik ogmante, ki amelyore konduktiviti nan tèmik nan pwodwi a.

(4) Thermal shock resistance:

Rezistans nan chòk tèmik nan brik alumina segondè se ant pwodwi ajil ak pwodwi silice. Sik refwadisman dlo a nan 850 ° C se sèlman 3 a 5 fwa. Sa a se sitou akòz lefèt ke korundom gen pi wo ekspansyon tèmik pase mullite san transfòmasyon kristal. Koulye a, li posib amelyore estrikti patikil pwodwi a, redwi kontni an nan poud amann, ak ogmante gwosè a patikil kritik ak gradyasyon patikil nan machfèr a amelyore rezistans nan chòk tèmik nan pwodwi a.

(5) Slag resistance:

Segondè brik alumina gen plis Al2O3, ki se fèmen nan materyèl net REFRACTORY, epi yo ka reziste ewozyon nan salop asid ak salop alkalin. Paske nan enklizyon de SiO2, kapasite nan reziste salop alkalin se pi fèb pase sa yo ki nan salop asid. Anplis de sa, se rezistans nan salop nan brik alumina segondè ki gen rapò tou ak estabilite nan pwodwi a nan salop la. Anjeneral pale, apre bòdi-wo presyon ak segondè-tanperati tire, pwodwi ki gen pi ba porositë gen pi wo rezistans salop.

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: