MgO-CaO-Fe2O3 series electric furnace ramming material prepared from fine magnesia-calcium brick powder

Abstract

The invention provides a MgO-CaO-Fe2O3 series electric furnace ramming material prepared from fine magnesia-calcium brick powder. The MgO-CaO-Fe2O3 series electric furnace ramming material is prepared from, by weight, 95 or below parts of 0-0.078 mm fine magnesia-calcium brick powder, 50 or below parts of 0-0.078 mm light-burnt magnesia powder, 6 or below parts of iron red, 1-3 parts of MgO micro-powder, 1-5 parts of alpha-Al2O3 micro-powder, 0.5-5 parts of ceramic fibers and 1-1.5 parts of titanium oxide. The fine magnesia-calcium brick powder, the light-burnt magnesia powder and the iron red are adopted as main raw materials, the alpha-Al2O3 micro-powder, MgO, rare earth oxide-containing ceramic fibers and titanium dioxide are added as auxiliary materials, and the fine magnesia-calcium brick powder is used to substitute parts of the light-burnt magnesia powder in the briquetting process; and a preparation technology of the ramming material has the advantages of simplicity, realization of the waste utilization of magnesia-calcium bricks, and improvement of the thermal shock stability and the erosion resistance of the above product.

Description

Technical field [0001] The present invention relates to the technical field of refractory materials, in particular to a MgO-CaO-Fe prepared from finely ground magnesia-calcium bricks 2 O 3 Ramming material for electric furnace Background technique [0002] Magnesium calcium iron (MgO-CaO-Fe 2 O 3 ) Quality dry ramming material is a refractory material mainly used to construct or repair the bottom of electric arc furnace. Magnesium-calcium iron ramming material has high density, high strength, strong erosion resistance, good volume stability and sintering performance. It has the advantages of being able to form a solid integral sintered layer at high temperature, long service life, simple construction, and not limited by the size of the furnace when used, so it has been widely used. [0003] The conventional magnesia-calcium-iron dry ramming material is composed of pre-synthesized magnesia-calcium-iron sand and sintered magnesia or fused magnesia according to a certain particle size...

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Problems solved by technology

[0003] Conventional magnesia-calcium-iron dry ramming material is a mixture composed of pre-synthesized magnesia-calcium-iron sand and sintered magnesia or fused magnesia according to a certain particle size distribution, and then sintered; the magnesia-calcium-iron sand is lightly fired Magnesium powder and iron red balls are calcined, and the process of preparing magnesia-calcium-iron sand requires a lot of energy and causes serious environmental pollution.

[0004] In the process of producing magnesia-calcium bricks, some magnesia-calcium bricks will have defects such as hydration and cracks during the firing stage, which cannot meet the requirements of use and can only be discarded as waste bricks. In order to solve this problem, this kind of How to deal with magnesia calcium bricks

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