Bata alumina tinggi

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 tinggis 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

Réfrakabilitas bata alumina anu luhur langkung luhur tibatan bata liat sareng bata semi-silika, ngahontal 1750 ~ 1790 ℃, anu kagolong kana bahan réfrakter canggih. Réfraksiasi utami dipangaruhan ku eusi, jinis sareng kuantitas Al2O3, sareng réfraksi naék nalika eusi Al2O3 ningkat.

(2) Load softening temperature:

Kusabab bata alumina anu tinggi gaduh Al2O3 tinggi, kirang pangotor, sareng awak kaca kirang tiasa dipasang, suhu pelembutan beban langkung luhur tibatan bata liat. Nanging, kusabab kristal mullite henteu ngawangun struktur jaringan, suhu pelembutan beban tetep henteu saluhur tina bata silika.

(3) Thermal conductivity:

Bata alumina tinggi gaduh konduktivitas termal anu langkung saé tibatan bata liat. Alesanna nyaéta aya sababaraha fase gelas anu kirang konduktivitas termal dina produk alumina tinggi, sedengkeun jumlah kristal mullite sareng corundum kalayan ningkatna konduktivitas termal anu langkung saé, anu ningkatkeun konduktivitas termal produk.

(4) Thermal shock resistance:

Résistansi shock termal bata alumina tinggi nyaéta antara produk liat sareng produk silikon. Siklus tiis cai dina 850 ° C ngan ukur 3 dugi 5 kali. Ieu utamina disababkeun ku kanyataan yén corundum gaduh ékspansi termal langkung luhur tibatan mullite tanpa transformasi kristal. Ayeuna, dimungkinkeun pikeun ningkatkeun struktur partikel produk, ngirangan eusi bubuk rupa, sareng ningkatkeun ukuran partikel kritis sareng gradasi partikel klinker pikeun ningkatkeun résistansi shock shock produk.

(5) Slag resistance:

Bata alumina tinggi gaduh langkung Al2O3, anu caket kana bahan réfrakter nétral, sareng tiasa nolak érosi slag asam sareng slag basa. Kusabab dilebetkeun ku SiO2, kamampuan nolak slag basa langkung lemah tibatan tina slag asam. Salaku tambahan, résistansi slag tina bata alumina tinggi ogé aya hubunganana sareng stabilitas produk dina slag. Sacara umum, saatos nyetak tekanan tinggi sareng némbak suhu luhur, produk kalayan porositas handap gaduh résistansi slag langkung luhur.

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: