Steel-making uses fireproof data (1) converter uses fireproof data at present bedding face of mouth of the furnace cap of converter, tapping, around, bath and hearth all use magnesian carbon brick; Trunnion and position of broken bits line use brick of high strenth magnesian carbon. Magnesian content is 70 ～ commonly in magnesian carbon brick 75 ％ , black lead content is 16 ～ 20 ％ , bulk density is 2.8 ～ 2.9g/cm3, compression intensity 25 ～ 30MPa. Brick of high strenth magnesian carbon, composition is the same as magnesian carbon brick, but compression intensity is 30 ～ 42MPa. (2) slope of the hearth that electric stove uses fireproof material hot plate, furnace and bath are magnesia whole knot, or the magnesia brick that uses magnesian carbon brick and tar pitch band; Heat and division of broken bits line, use brick of high quality magnesian carbon; Two side and tapping El are magnesia brick, chromic magnesia brick at the door furnace; Electric stove furnace lid is tall aluminous brick or tall aluminium does not bake bricks. (3) freeboard power electric stove is magnesian stone with the intermediate line of electric stove of power of fireproof material freeboard, column of furnace door side is magnesian chromic brick, broken bits line is magnesia brick, heat area is magnesian carbon brick, furnace wall is magnesian carbon brick, prejudicial bottom and bath are magnesia brick, tapping mouth is magnesian carbon brick, electric furnace lid is tall aluminous brick, tapping aperture filling is inserts of tall iron dolomite. (4) open-hearth furnace uses fireproof material to be able to see from the working state of all sorts of steel-making furnace, the working environment of fireproof material is very abominable, accordingly, no matter what use fireproof material, have the following property: (1) is high temperature resistant, have taller fireproof degree. (2) is high temperature resistant of molten steel and slag erode and erode. (3) steel-making furnace works for intermittence, ask fireproof material has good heatproof shake gender and fight flake quality. (4) has higher mechanical strength, can bear to bend of body of heater is moved and load charging pound action and do not damage. Steel-making furnace introduces with firebrick at present, the firebrick that aerobic converter lining uses basically is carbonaceous alkalescent firebrick, like tar dolomite brick of magnesia brick of dolomite brick, tar, magnesian carbon mixes magnesium of brick, tar all sorts of macerate bricks. Additional, still gush fills used fireproof spray paint. From since using aerobic converter steel-making, each country pledges with magnesium with dolomite qualitative firebrick makes lining generally, or the brick is made use after both mixes. Total trend is to raise raw material purity forward, add magnesian content appropriately, raise goods density and the directional development that raise remains to contain carbon to measure, the quality of lining brick rises stage by stage, breed also increases ceaselessly. Steel-making uses firebrick using up is very big, and affect the life of steel-making furnace and smelt cost directly. Accordingly, when choosing firebrick, divide outside should satisfying smelt craft to ask, even according to resource state, reasonable use, carry highland to expect to calcine is mixed ceaselessly the technology that make a brick, with period use relatively the firebrick of beautiful, achieve the goal of furnace long life and low cost. The deliquescent refine slag to firebrick is opposite steel-making broken bits the deliquescent phenomenon of solid oxide, in firebrick respect it is all phenomena that study its are deliquescent, from steelmaking process respect be research lime is deliquescent, i.e. broken bits changes an appearance. Dissolve enters solid oxide the phenomenon of liquid oxide, have a lot of collective place. The reaction of firebrick and slag, can observe an analysis with two kinds of means, it is to use all sorts of slag experiment laws to have reaction with actual firebrick below high temperature firstly, erode a state to have observation and opinion directly from its, it is the bases of the bases to slag and firebrick secondly, from what balance illative production according to phasor mineral photograph, fluid photograph is measured or fuse is spent etc. Solid is deliquescent when be a liquid, its contact fuse of partial happening reaction, the surface forms photograph of saturated frit fluid. Accordingly, the frit in fluid of this kind of saturated frit is met character diffuse to the middle of frit fluid, a diffusion layer is formed between saturated part and solution. Firebrick also often has this kind of reaction. Below the high temperature of firebrick as catalytic as slag, the layer of fluid photograph glass that expresses facing to form low fusibility is as similar as afore-mentioned diffusion layer. Additional, slag and firebrick are divided outside exterior layer reaction. Still soak firebrick interior from air hole, produce fuse with firebrick structure layer, the frit of composition generation solid in crystallization, diffuse. Soak stomatic slag. Composition produces change gradually, place of interiorly low temperature forms stabler crystallization layer, with vitreous shape solidify. Call degenerative layer or infiltrate this one part commonly layer, also can regard saturated layer as. The deliquescent phenomenon in studying firebrick frit enters the basic department broken bits of steel-making broken bits, be about to study its bases - the deliquescent speed that Al2O3 dissolve enters melt ferric oxide. Its are as follows to the deliquescent process of melt ferric oxide: 1, alumina from interior of system of be in harmony to body of be in harmony - alumina interface diffuses. 2, go up in the interface, ferric oxide and alumina reaction generate pointed spar. 3, iron aluminium pointed spar enters system of be in harmony. 4, alumina diffuses in body of be in harmony. Above is steel-making broken bits namely the deliquescent principle to firebrick, the service life accident of firebrick often has very big correlation with this. Fireproof material occurrence craze, fall off, easy how to wear away to do? Want to solve a problem thoroughly, need to be dug from germ, the analysis gives real reason, flourish Cheng Naicai is engaged in be able to bear or endure service of timber production, research and development is old, can solve all sorts of difficulty problems of liner of furnace of high temperature kiln, welcome broad new old friend to seek advice reach technical communication.
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