Magnalium brick with
Square magnesian stone
Give priority to brilliant photograph, with magnalium needle spar is matrix, with magnesia brick of excel of heatproof shake sex be good at. To improve the heatproof shake sex of magnesia brick, fine pink of alumina or aluminous aluminous grog introduces in burden, form matrix of magnalium pointed spar, make magnalium brick thereby. The characteristic of magnalium brick is heatproof shake sex good, loading bate temperature is high, loading bate temperature is in 1580 ℃ above, be able to bear or endure vitreous aggressivity is good. As
The addition of content, apparent pore rate of the brick rises. But when
Content is less than 10% when, brick still more compact, apparent pore rate can be amounted to 14% , it is 15% ～ commonly 18% .
Magnalium brick begins occurrence plasticity flow from 1000 ℃ , to 1200 ℃ when more remarkable already, the flow when 1300 ℃ is quickened, these all are different from magnesia brick with close of magnesian chromic brick, and begin rapid flow temperature than magnesia brick tall 200 ℃ of 100 ～ . Join a quantity to be less than when alumina 15% when, magnalium brick and ferric oxide action do not arise expand, join a quantity to amount to 15% when appear small expand; 20% when more apparent; 28% when expand serious.
Magnesian qualitative brick is used at metallurgical industry for the most part. Magnalium brick strength of good as a result of thermal stability, high temperature is great, basically use at steel-making
Open-hearth furnace
The significant position such as roof. High pure magnesia brick is used at
Converter
And
The fine outside furnace
The area of easy corrode caustic of furnace. Magnesian carbon brick basically is used at converter,
Electric stove
With the significant position of the finery outside furnace. Magnesian silica brick or contain SiO
2
Taller magnesian olivine brick, what can be used at the regenerator of open-hearth furnace and vitreous frit kiln and cement rotary kiln is firing belt. Magnesia brick of frit bead recombine, multi-purpose serious crucial place is eroded in the finery outside electric stove, furnace and nonferrous metal smelting furnace.
1, the chemical composition of magnalium brick, what its chemistry composition follows raw material is different and different, mgO>81% is like — , al2O3 8.7% , siO2<6.0% , caO<1.5% , fe2O3<1.0% .
2, the mineral composition of magnalium brick, in its in mineral composition advocate crystal is given priority to with Fang Mei stone, matrix by iron acid magnesian, magnesian olivine, calcic magnesian olivine is mixed the composition such as magnalium pointed spar.
3, of magnalium brick fireproof degree with loading bate temperature, crystal of square in magnalium brick magnesian stone and magnalium pointed spar form network framework, although have a few impurity of low melting point fills up between the space in network framework, but the capacity that network framework still has counteractive high temperature and loading, of reason magnalium brick fireproof spend and loading bate temperature is higher, fireproof degree can amount to 2100 ℃ , loading bate temperature is 1570 ℃ .
4, the heat of magnalium brick is expansile with thermal stability, because magnalium is pointed the linear expansion coefficient of spar is small, the linear expansion coefficient of magnalium brick is very so small. In 20? Inside 1000 ℃ limits, the linear expansion coefficient of magnalium brick is 10.6×10-6 ℃ only - 1. Because magnalium is pointed,spar rises to enhance the action of heatproof shake sex inside the brick, the heatproof shake sex of magnalium brick is so better, water-cooling frequency is in 20 times above.
5, the sex fighting broken bits of magnalium brick, because magnalium brick is compact degree of tall, porosity is low, and square magnesian stone is surrounded by place of magnalium pointed spar again, at the same time Al2O3 is typical neuter oxide, the capability that reason magnalium brick resists acidity and alkalescent slag are eroded is stronger.
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