Bata alumina sing dhuwur

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, bata alumina inggils 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

Refraksiabilitas bata sing luwih dhuwur luwih dhuwur tinimbang bata lempung lan bata semi-silika, tekan 1750 ~ 1790 ℃, sing kalebu bahan tahan panas sing maju. Refraktoritas utamane kena pengaruh karo konten, jinis lan jumlah Al2O3, lan tahan maneh maneh nalika kandungan Al2O3 mundhak.

(2) Load softening temperature:

Amarga bata alumina sing dhuwur duwe Al2O3 sing dhuwur, kurang kotoran, lan awak kaca sing kurang bisa digunakake, mula suhu pelunakan beban luwih dhuwur tinimbang bata bata lempung. Nanging, amarga kristal mullite ora mbentuk struktur jaringan, suhu pelunakan muatan isih durung sepele karo bata silika.

(3) Thermal conductivity:

Bata alumina sing dhuwur duwe konduktivitas termal sing luwih apik tinimbang bata lempung. Alasane yaiku ana sawetara fase kaca sing kurang konduktivitas termal ing produk alumina tinggi, dene jumlah kristal mullite lan corundum kanthi konduktivitas termal sing luwih apik, sing bisa nambah konduktivitas termal produk.

(4) Thermal shock resistance:

Resistensi kejut termal saka bata alumina sing dhuwur yaiku ing antarane produk lempung lan produk siliceous. Siklus adhem banyu ing 850 ° C mung 3 nganti 5 kali. Iki utamane amarga kasunyatan manawa corundum duwe ekspansi termal sing luwih dhuwur tinimbang mullite tanpa transformasi kristal. Saiki, sampeyan bisa nambah struktur partikel produk, nyuda isi bubuk sing apik, lan nambah ukuran partikel kritis lan gradasi partikel klinker kanggo nambah resistensi kejut termal kanggo produk kasebut.

(5) Slag resistance:

Bata alumina sing dhuwur duwe luwih akeh Al2O3, sing cedhak karo bahan tahan panas netral, lan bisa nahan erosi slag asam lan slag alkali. Amarga kalebu SiO2, kemampuan nolak slag alkali luwih lemah tinimbang slag asam. Kajaba iku, resistensi slag saka bata alumina sing dhuwur uga ana gandhengane karo stabilitas produk ing slag. Umume, sawise ngecor tekanan tinggi lan tembak suhu tinggi, produk kanthi porositas ngisor duwe resistensi slag sing luwih dhuwur.

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: