Biriky alumina avo

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, biriky alumina avos 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

Ny fihenan’ny biriky alumina avo dia avo kokoa noho ny biriky tanimanga sy biriky semi-silica, mahatratra 1750 ~ 1790 ℃, izay an’ny akora fanafana mahery vaika. Ny réfractabilité dia voakasiky ny atiny, ny karazany ary ny habetsaky ny Al2O3, ary ny fitomboan’ny fiakarana miakatra rehefa mitombo ny atin’ny Al2O3.

(2) Load softening temperature:

Satria ny biriky alumina avo dia manana Al2O3 avo lenta, vitsy ny fahalotoana ary vatana fitaratra tsy azo zahana, ambony kokoa noho ny biriky tanimanga ny mari-pana manalefaka entana. Na izany aza, satria ny kristaly mullite dia tsy mamorona firafitry ny tamba-jotra, ny mari-pana manalefaka entana dia mbola tsy ambony noho ny an’ny biriky silica.

(3) Thermal conductivity:

Ny biriky alimina avo dia manana fitondra hafanana tsara kokoa noho ny biriky tanimanga. Ny antony dia satria vitsy kokoa ny dingana fitaratra misy fitarihana hafanana ambany amin’ny vokatra avo-alumina, raha mitombo kosa ny isan’ny kristaly mullite sy corundum miaraka amin’ny fitarihana hafanana tsara kokoa, izay manatsara ny fitarihan’ny vokatra.

(4) Thermal shock resistance:

Ny fanoherana ny fikorontanan’ny hafanana an’ny biriky alumina avo dia eo anelanelan’ny vokatra tanimanga sy ny vokatra siliceous. Ny tsingerin’ny rano mangatsiaka amin’ny 850 ° C dia 3 ka hatramin’ny 5 fotsiny. Izany dia vokatry ny zava-misy fa ny corundum dia manana fanitarana hafanana avo kokoa noho ny mullite tsy misy fiovan’ny kristaly. Amin’izao fotoana izao, azo atao ny manatsara ny firafitry ny vongan’ilay vokatra, mampihena ny atin’ny vovoka manify, ary mampitombo ny haben’ny tsiranoka mivaingana sy ny famaranana ny sombintsombin’ny clinker hanatsarana ny fanoherana ny hafanana amin’ny vokatra.

(5) Slag resistance:

Ny biriky alimina avo dia manana Al2O3 bebe kokoa, izay manakaiky ny fitaovana tsy miandany, ary mahazaka ny fikaohin’ny poti-asidra sy ny tampon’ny alkaly. Noho ny fampidirana ny SiO2, ny fahaizana manohitra ny silamo alkaly dia malemy kokoa noho ny an’ny asidra asidra. Ho fanampin’izany, ny fanoherana ny slag an’ny biriky alimina avo dia mifandraika amin’ny fahamarinan-toerana amin’ny vokatra. Amin’ny ankapobeny, aorian’ny famolavolana tosika avo lenta sy ny fandoroana hafanana avo lenta, ny vokatra misy porosia ambany dia misy fanoherana avo kokoa.

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: