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Magnesian carbon brick is nod alkalescent oxide with Gao Rong magnesian (melting point 2800 ℃ ) and be invaded by slag hard the Gao Rong of embellish nods carbolic element material to serve as raw material, add all sorts of blame oxide additive. Do not burn carbon with what charcoal pledges bond is united in wedlock and become compound and fireproof material. Magnesian carbon brick basically is used at the liner of furnace of converter, alternating current arc, dc arc furnace, the place such as the broken bits line that steel includes.
Magnesian carbon brick serves as a kind of compound and fireproof material, used magnesia effectively fight broken bits to erode ability to be reached by force with tall thermal conductivity of carbon low expansile, compensated magnesia to be able to bear or endure the big drawback that flakes the gender is differred.
Its are main the characteristic has: 1 have good high temperature resistant function the 2 capability that fight broken bits are strong sex of 3 heatproof shake is good creep of 4 high temperature is low
The raw material influence to function of magnesian carbon brick
Produce the main raw material of magnesian carbon brick, the actor bad of magnesia quality is having very main effect to the function of magnesian carbon brick, how choosing magnesia reasonably is the hinge that produces magnesian carbon brick. Magnesia has electric frit magnesia and agglomeration magnesia, they have different characteristic. Electric frit magnesia: Grain is big, foreign matter is little, silicate photograph is little, grain links rate directly tall, crystal boundary is little.
Agglomeration magnesia: Grain is petty, foreign matter and silicate photograph cry relatively much, direct couple rate is poorer.
To magnesia raw material, besides chemical composition, organizing structural aspect, requirement high density is spent and still crystallize greatly, accordingly, the index of quality of magnesia raw material that as production magnesian carbon brick uses, should inspect following content: 1. Magnesian content (purity) . 2. The sort of foreign matter especially.C/S and B2O3 content. 3. The density of magnesia, stomatic aperture, stomatic configuration (agglomeration sex) .
The purity of magnesia is having major effect to the sex fighting broken bits of magnesian carbon brick. Magnesian content is higher, foreign matter is jumped over relatively little, silicate photograph breaks up degree to reduce, square magnesian stone combines degree to rise directly, the frit caustic ability of the osmosis that fights broken bits and broken bits rises. The impurity in magnesia basically has oxidation calcium, 2 oxidation silicon, ferric oxide, [1] If matter content is high, oxidize especially boracic compound, the meeting is right of magnesia fireproof spend and high temperature capability produces adverse effect.
The adverse effect that the impurity in magnesia basically has a few sides 2 high temperature leave the 1 direct couple rate that lowers square magnesian stone with magnesian form low frit content 3 ferric oxide, the impurity such as 2 oxidation silicon is when 1500-1800 ℃ , first at magnesian react with carbon, leave air hole to make the sex fighting broken bits of goods becomes poor.
To magnesia raw material, besides the gross of foreign matter, the sort of foreign matter and the function relative to content team magnesia have major effect likewise. Among them CaO/SiO2 is more apparent than be with the influence of B2O3 content, average magnesian qualitative fireproof data asks normally CaO/SiO2 ≥ 2 in order to increase stability of high temperature of magnesian carbon brick
The carbolic element material of brick of preparation magnesian carbon basically is scale black lead
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