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Study on Slag Resistance of Resin-bond Unburnt MgO-CaO System and Low-carbon MgO-C System Refractory

Author: HuangBo
Tutor: ZhangWenJie；GuHuaZhi
School: Wuhan University of Science and Technology
Course: Inorganic non-metallic materials
Keywords: Low-carbon magnesia carbon refractories Not burned magnesia refractories Resin bond Slag resistance Clean Steel
CLC: TQ175.7
Type: Master's thesis
Year: 2002
Downloads: 275
Quote: 1
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Abstract


The induction furnace slag resistance test method, of AOD furnace stainless steel slag (CaO-SiO 2 Department slag) collected at the scene and the CaO-Al 2 O Department of refining slag erosion agent combination of low-carbon MgO-C Department of the different composition of the resin, not burning slag resistance of MgO-CaO refractories performance were studied. Different additives in low carbon MgO-C refractories (a-Al 2 O 3 the micronized MgAlON, Si 3 N 4 ) its slag resistance; burned Department of MgO-CaO refractories research slag CaO content (10%, 20%, 30%) and additive (a -Al 2 O 3 the micronized, MgAlON) Department of MgO-CaO refractory melt loss and penetration of burning magnesium calcium brick contrast with imports. Observation and measurement of the cross-section of the sample after the experiment, and sample preparation using microscopy and electron probe microscopic observation of micro-components analysis to study the erosion mechanism. Further relevant CaO-SiO 2 -Al 2 O 3 -MgO quaternary in the liquid region at 1600 ℃ and saturated view , calculated by the saturation concentration of the MgO-CaO-based refractory and slag boundary layer, and the slag surface tension and viscosity, analysis discusses its impact on the MgO-CaO-based refractory aggressive for different slag selection refractory material, provide a basis for improving its slag resistance. The results show that: (1) in the low-carbon MgO-C (C = 7%), line the refractory matrix part add a-Al 2 O 3 powder and MgAlON powder significantly improves the melting loss and permeability of the slag resistance of the sample; (2) in combination in the resin does not burn in the MgO-CaO-based refractory, with increasing CaO content, CaO-SiO 2 Department slag, slag resistance capacity enhanced CaO-Al 2 O 3 Department slag, the law is the opposite; (3) Regardless of what kind of slag system, with increasing content of CaO, MgO-CaO refractories, its resistance to slag penetration enhancement; (4) introduced the additive MgAlON powder sample, regardless of what kind of slag system has good resistance to slag performance, induction furnace slag resistance experiments the burned magnesium calcium brick low melting loss depth than imports about 18% to 25% of the effect; (5) MgO-CaO Refractories slag - molten steel - refractories sector song slag film accompanied by the melting of the refractory oxide component, the concentration gradient of the oxide component, is formed along the width direction of the slag film surface tension gradient, resulting in a three-phase interface form a horse Luan Marangoni convection, the convection effectively promote the refractory melting component to the slag in the substance movement, so premises melting loss of the most serious; addition, the surface tension and viscosity of the slag in the MgO-CaO-based refractory materials of different composition has a great influence to the permeability of the slag resistance .

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CLC: > Industrial Technology > Chemical Industry > Silicate > The refractory industry > Refractory
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