Brik alumina dị elu

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, brik alumina dị elus 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

Mgbanwe nke brik alumina dị elu dị elu karịa nke brik ụrọ na brik ọkara silica, na-eru 1750 ~ 1790 ℃, nke bụ nke ihe nrụgharị dị elu. The refractoriness na -emetụta ọdịnaya, ụdị na nke ukwu nke Al2O3, na refractoriness na -abawanye ka ọdịnaya nke Al2O3 na -abawanye.

(2) Load softening temperature:

N’ihi na brik alumina dị elu nwere Al2O3 dị elu, adịghị ọcha na -adịchaghị mma, na obere iko na -emegharị emegharị, oke ịdị nro dị arọ dị elu karịa nke brik ụrọ. Agbanyeghị, n’ihi na kristal mullite anaghị etolite usoro netwọkụ, ọnọdụ ịdị nro nke ibu adịghị ka nke brik silica.

(3) Thermal conductivity:

Brik alumina dị elu nwere conductivity thermal ka mma karịa brik ụrọ. Ihe kpatara ya bụ na enwere obere obere iko nwere obere ọkụ ọkụ na ngwaahịa alumina dị elu, ebe ọnụ ọgụgụ kristal mullite na corundum nwere conductivity ka mma na-abawanye, nke na-eme ka nrụpụta ọkụ nke ngwaahịa a dị mma.

(4) Thermal shock resistance:

Nguzogide ujo dị ọkụ nke brik alumina dị elu dị n’etiti ngwaahịa ụrọ na ngwaahịa siliceous. Igwe mmiri jụrụ oyi na 850 ° C bụ naanị ugboro 3 ruo 5. Nke a bụ ọkachasị n’ihi eziokwu ahụ bụ na corundum nwere mmụba dị elu karịa mullite na -enweghị mgbanwe kristal. Ka ọ dị ugbu a, ọ ga -ekwe omume ịkwalite usoro urughuru ngwaahịa ahụ, belata ọdịnaya nke ntụ ntụ dị mma, ma bulie nha ururu dị mkpa na gradation nke plọg iji meziwanye nguzogide ọkụ nke ngwaahịa a.

(5) Slag resistance:

Nnukwu brik alumina nwere Al2O3 ọzọ, nke dị nso na ihe ndị na -emegharị anya, ma nwee ike iguzogide nsị nke slag acidic na slag alkaline. N’ihi ntinye nke SiO2, ikike iguzogide slag alkaline esighị ike karịa nke slag acidic. Na mgbakwunye, nguzogide slag nke brik alumina dị elu na -emetụtakwa nkwụsi ike nke ngwaahịa dị na slag. N’ikwu okwu n’ozuzu, mgbe ịkpụzi mgbali elu na mgbanyụ ọkụ dị elu, ngwaahịa ndị nwere obere porosity nwere nguzogide slag dị elu.

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: