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What is the breathable magnesia brick in the classification of magnesia bricks?

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What is the breathable magnesia brick in the classification of magnesia bricks?

2019-09-23
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For magnesia brick, some use condition is to use the high porosity of product and higher permeability.Ramming material, at present, widely used steel ladle bottom blowing argon permeable corundum brick, with gas blowing metal, namely gas blowing liquid corundum brick.With the same size of particles, the particles are tightly bonded together with filler and binder in the sintering process, so that the product becomes a solid block, and the particle material of the same size determines the shape and size of the pores.If it is necessary to increase the air permeability of the product, the grain size of the burnt-out additive should be the same as that of the filler, and the shape should be the same as that of the filler.A porous porous magnesia brick used for blowing metals. Corundum magnesia has some advantages.Industrial use of permeable corundum brick can be 63 fused corundum 80% as granule, industrial alumina (65%) and refractory clay (35%) as binder, 20%, the binder to be in the cylinder mill together fine grinding, the content of more than 60 microns can not exceed 1% ~ 1.5%.The mud should be mixed in the wet mill for 10min, and the mud should be watered by 4.3% ~ 5%. Then, the mud should be screened on the screen with the size of 5mm.The blank is formed on a hydraulic press with a pressure of 35MPa, and the density of the blank is up to 2.60g/cm3.The products shall be fired in tunnel kiln or inverted flame kiln at a temperature of 1570℃ with an insulation of 22±2h. The total firing time shall not be less than 150h.



There are various manufacturing methods of breathable corundum bricks. 20% binder is made by grinding corundum wastes (60%) and clay (40%) together, the moisture content of the slurry is 4% ~ 5%, the pressed brick density is 2.60g/cm3:, it is fired in the tunnel kiln for 86h, the firing temperature is 1560℃, and the insulation is (5±1)h.Others use magnesia brick as aggregate, pure calcium aluminate cement and SiO2 superfine powder as binder, phosphate as dispersant, and adopt ultra-low cement castable process.


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