Low thermal conductance continuous casting tundish working layer lining brick and preparation method thereof

Abstract

The invention relates to a brick for a continuous casting tundish working layer and a preparation method. The brick comprises the following components in percentage by weight: 15 to 30 percent of magnesium calcium sand or magnesium sand with granularity of 1 to 2 millimeters, 51 to 70 percent of magnesium calcium sand or magnesium sand with granularity of 0.5 to 1 millimeter, 13 to 20 percent of magnesium calcium sand or magnesium sand with granularity of less than 0.088 millimeter, 1 to 3 percent of modified petroleum coke with granularity of less than 0.088 millimeter, and modified phenolicresin in an amount which is 2 to 4 percent of the total weight of the previous raw materials. The preparation method comprises the following steps of: pre-mixing the magnesium calcium sand or the magnesium sand with granularity of 1 to 2 millimeters and the magnesium calcium sand or magnesium sand with granularity of 0.5 to 1 millimeter; sequentially adding the modified phenolic resin and the modified petroleum coke, mixing and grinding; adding the magnesium calcium sand or magnesium sand with granularity of less than 0.088 millimeter, mixing and grinding; ageing the mixture, pressing and molding; performing natural drying; heating and drying in a kiln; performing natural cooling together with the kiln; and discharging the product out of the kiln, and naturally cooling the product to roomtemperature. The brick has the characteristics of low thermal conduction coefficient, strong scouring resistance and erosion resistance, simple construction, low baking energy consumption and the like.

Description

technical field [0001] The invention relates to a refractory material for iron and steel metallurgy, in particular to a low thermal conduction lining brick applied to the working layer of a continuous casting tundish and a preparation method thereof. Background technique [0002] At present, most of the working linings of tundishes are constructed by smearing with amorphous refractory materials (also divided into manual or mechanical smearing) and dry ramming, or are assembled by means of heat-insulating prefabricated panels. In the actual construction and use process, there are The following questions: [0003] 1. During the construction process of monolithic refractories, stirring, mixing and smearing are greatly affected by human factors, the construction quality is difficult to guarantee, and the thickness is not easy to control; [0004] 2. The structural strength, erosion resistance and erosion resistance of amorphous refractory materials are low. During use, the work...

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Problems solved by technology

[0003] 1. During the construction process of monolithic refractories, stirring, mixing and smearing are greatly affected by human factors, the construction quality is difficult to guarantee, and the thickness is not easy to control;

[0004] 2. The structural strength, erosion resistance and erosion resistance of amorphous refractories are low, and the working lining is easily peeled off due to erosion and erosion during use, and inclusions are formed to affect the quality of molten steel

[0005] 3. Unshaped refractory materials are constructed by smearing or ramming. The water content in the material is high, and cracks are easy to appear during baking, which affects the use. The baking cycle is long, the energy consumption is high, and the turnover rate of equipment is low; the water is not easy to drain. It is easy to cause the hydrogen content in molten steel to increase during use

[0006] 4. The method of assembling thermal insulation prefabricated panels is likely to lead to thermal stress concentration, local spalling and molten steel seepage accidents, especially at corners. This method is rarely used at present

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