Babban tubalin 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, babban tubalin 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

Ƙaƙƙarfan babban tubalin alumina ya fi na yumɓun yumɓu da tubalin siliki, ya kai 1750 ~ 1790 ℃, wanda ke cikin kayan haɓaka mai ci gaba. The refractoriness ne yafi shafi da abun ciki, irin da yawa na Al2O3, da refractoriness ƙaruwa kamar yadda abun ciki na Al2O3 ƙaruwa.

(2) Load softening temperature:

Saboda manyan tubalin alumina suna da babban Al2O3, ƙarancin ƙazanta, da ƙarancin gilashin gilashi, zazzabi mai laushi yana da girma fiye da na tubalin yumbu. Koyaya, saboda lu’ulu’u na mullite ba su samar da tsarin cibiyar sadarwa ba, har yanzu zafin zafin da ke ɗaukar nauyi bai kai na tubalin silica ba.

(3) Thermal conductivity:

Babban tubalin alumina yana da mafi kyawun yanayin zafi fiye da tubalin yumbu. Dalilin shi ne cewa akwai ƙarancin matakan gilashi tare da ƙarancin ƙarancin zafi a cikin samfuran alumina, yayin da adadin mullite da corundum lu’ulu’u tare da ingantaccen yanayin zafi yana ƙaruwa, wanda ke inganta haɓaka yanayin zafi na samfurin.

(4) Thermal shock resistance:

Tsayayyar girgizar zafi na manyan tubalin alumina yana tsakanin samfuran yumɓu da samfuran siliceous. Tsarin sake sanyaya ruwa a 850 ° C sau 3 zuwa 5 ne kawai. Wannan galibi saboda gaskiyar cewa corundum yana da faɗaɗawar zafi fiye da mullite ba tare da canjin crystal ba. A halin yanzu, yana yiwuwa ya inganta samfurin ta barbashi tsarin, rage abun ciki na lafiya foda, da kuma kara da m barbashi size da barbashi gradation na clinker don inganta thermal buga juriya da samfurin.

(5) Slag resistance:

Babban tubalin alumina yana da ƙarin Al2O3, wanda yake kusa da kayan tsaka tsaki na tsaka tsaki, kuma yana iya tsayayya da yaɗuwar acidic slag da alkaline slag. Saboda haɗawa da SiO2, ikon yin tsayayya da slag na alkaline yana da rauni fiye da na slag acidic. Bugu da ƙari, juriya na slag na manyan tubalin alumina shima yana da alaƙa da kwanciyar hankali na samfurin a cikin slag. Gabaɗaya magana, bayan ƙwanƙwasa babban matsin lamba da harbe-harben zazzabi mai zafi, samfuran da ke da ƙananan porosity suna da juriya mafi girma.

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: