Recycled magnesia carbon coating material with strong slag-corrosion resistance and application thereof

Abstract

The invention relates to a recycled magnesia carbon coating material with strong slag-corrosion resistance and an application thereof. The coating material is composed of the following materials by weight percentage: 10-15% of waste magnesia carbon brick regenerated granule material with the granularity of not less than 3mm and not more than 5 mm, 25-30% of waste magnesia carbon brick regenerated granule material with the granularity of not less than 1 and not more than 3 mm, 30-35% of magnesite clinker with the granularity of not less than 0.083 mm and not more than 1 mm, 10-12% of fused magnesite micro powder with the granularity of less than or equal to 0.047mm, 3-5% of alpha-Al2O3 micro powder with the granularity of less than or equal to 0.047 mm, 3.5-5% of alumina-magnesia spinel micro powder with the granularity of less than or equal to 0.047 mm, 3.5-4.0% of soft clay, 1.5-2.5% of silica powder, 0.2-0.5% of sodium tripolyphosphate, 0.5-1.0% of metal silicon powder with the granularity of less than or equal to 0.074 mm, 0.7-1.2% of silicon carbide powder with the granularity of less than or equal to 0.074 mm, and 0.1-0.3% of refractory fiber. The recycled magnesia carbon coating material with strong slag-corrosion resistance, provided by the invention, is good in slag-corrosion resistance and long in service life, the problems of penetration of steel in the recycled magnesia carbon coating material, the penetration of steel between the upper nozzle and the brick cup, the high cladding temperature of the tundish and the bad disassembly performance are solved, the single packet pouring time is increased by 6h or above and the cladding temperature of the tundish is reduced by 60 DEG C or above.

Description

technical field [0001] The invention relates to a regenerated magnesia-carbon smear material with strong slag resistance and an application thereof, belonging to the technical field of regeneration and utilization of waste magnesia-carbon bricks. Background technique [0002] Using the regenerated magnesia-carbon brick pellets produced by processing waste magnesia-carbon bricks as raw materials, we develop and produce regenerated magnesia-carbon smear materials, which are used for the working lining of continuous casting tundish, which can not only reduce the emission of waste magnesia-carbon bricks, reduce environmental pollution, Moreover, the production cost of the smear can be reduced, thereby reducing the cost of continuous casting refractory materials. However, the recycled magnesia carbonaceous smear material produced by the prior art has poor slag resistance performance and is applied to the working lining of the continuous casting tundish. The temperature of the tu...

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Problems solved by technology

[0004] The purpose of the present invention is, aiming at the problems existing in the regenerated magnesia-carbon brick granules produced by the prior art, the present invention provides a regenerated magnesia-carbon smear material with strong slag resistance performance, compared with a magnesia-chromium carbon smear disclosed in CN101550016 The porosity is reduced by more than 10% year-on-year, which effectively prevents the penetration of molten steel and slag. It is applied to the working lining of the slab continuous casting tundish and the cofferdam of the upper nozzle, and solves the problem of steel penetration and upper nozzle in the recycled magnesia-carbon coating material. Steel penetration between the block and the seat brick, high temperature of the tundish cladding, poor disintegration performance, etc., the pouring time of a single ladle has increased by more than 6 hours compared with the same period last year, and the temperature of the tundish cladding has decreased by more than 60°C year-on-year

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