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Carbon system aluminium spinel air permeable brick

A technology of aluminum spinel and breathable bricks, applied in the field of iron and steel smelting, can solve problems such as air passage blockage, and achieve the effects of reducing infiltration, low cost, and ensuring gas passages

Inactive Publication Date: 2004-11-10
UNIV OF SCI & TECH BEIJING
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  • Abstract
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Problems solved by technology

Solve the problem of airway blockage and improve the service life

Method used

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  • Carbon system aluminium spinel air permeable brick

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specific Embodiment

[0012] In order to set forth this patent in detail, an example is given for illustration. Specific examples are as follows:

[0013]

[0014] Marked in the table: label *1 is SiC, SiO 2 , Fe 2 o 3 Sum. The mark *2 is SiO 2 , CaO, Fe 2 o 3 The sum; 5% of pure aluminate cement 75 was added to the sample, and 20% of MA76 (Al 2 o 3 76% sintered magnesium aluminum spinel). *3 is the result of slag leaching experiment at 1600℃×6h, in which steel slag composition (mass percentage, %) is: CaO: 51.64, SiO 2 : 25.9, Al 2 o 3 : 10.62, Fe 2 o 3 : 2.67, MgO: 5.74.

[0015] For breathable bricks, one of the main factors affecting their service life is the resistance to slag penetration. If the slag penetrates deeply, the infiltrated slag will denature the material and form a metamorphic layer, which will block the air passage and must be treated by "burning oxygen", which will lead to excessive corrosion. And if the penetration depth of slag is shallow, less airway blocka...

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Abstract

The invention provides an air brick of aluminum spinelle carbon architecture comprising Al2O3, C, MgO and other constituents, wherein the mass fraction of each components are, Al2O3 55-90%, C 2-16%, MgO 1-20%, and other constituents 2-10% including SiC, SiO2, Fe2O3 and oxidation prevention addition agent, which is Al or Al-Mg alloy and is counted in by the form of Al2O3 and MgO during detecting procedure. The invention increases the length of effective brick and operating life.

Description

technical field [0001] The invention belongs to the field of iron and steel smelting, and in particular provides an aluminum-spinel-carbon system breathable brick, which is used in the argon-blowing treatment process of molten steel in iron and steel smelting. technical background [0002] Patent CN1039480C discloses the patent of air-permeable bricks for ladles. The air permeable brick is ventilated by forming a ventilation channel with vertical lamellar gaps, and its material is chrome-corundum-mullite material fired at high temperature; the composition of the material (weight%): electricity with a particle size of ≤3mm Fused corundum 35-75%, α-Al with particle size <10um 2 o 3 3-20%, 5-30% of fused mullite with a particle size of ≤3mm, 0.5-7% of industrial pure chromium oxide with a particle size of ≤0.2mm, and ≤10% of bonded clay with a particle size of ≤0.1mm. Since this material has a strong Fe when in contact with slag 2 o 3 Therefore, the working end of the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D41/58C04B35/103F27D1/04
Inventor 陈俊红李志坚孙加林
Owner UNIV OF SCI & TECH BEIJING
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