Low-cost tundish prefabricated part and preparation method thereof

Abstract

The invention discloses a low-cost tundish prefabricated part and a preparation method thereof, and relates to the technical field of steel smelting. The low-cost tundish prefabricated part comprisesthe following components in percentage by mass: 20-45% of regenerated magnesia carbon particles, 20-50% of magnesia particles, 10-30% of magnesia fine powder, 0.5-5% of a magnesium binding agent, 1-4%of Si2N2O, 2-5% of silica powder, 0.01-0.03% of metal aluminum powder, 0.1-0.15% of sodium tripolyphosphate, 0.1-0.15% of sodium hexametaphosphate and 0.05-0.15% of organic fibers. According to the low-cost tundish prefabricated part and the preparation method thereof, a reasonable and effective hydration process is provided, an impregnation treatment process is added on the basis of optimizing the hydration process, and after hydration and impregnation treatment process treatment, the regenerated magnesia carbon material is used for replacing fused magnesia, so that the production cost is greatly reduced, and meanwhile, the introduced Si2N2O can form microcracks at high temperature to buffer thermal stress, so that the high-temperature volume stability of the magnesium prefabricated partis improved, and the problem of damage caused by cracks is reduced.

Description

technical field [0001] The invention relates to the technical field of iron and steel smelting, in particular to a low-cost tundish prefabricated part and a preparation method thereof. Background technique [0002] With the continuous advancement of iron and steel smelting technology, the requirements for the performance of refractory materials are becoming increasingly stringent, but at the same time another important problem faced by refractory material manufacturers is the continuous increase in the price of raw materials, which leads to the continuous increase in the production cost of refractory material enterprises In order to find a way out, enterprises put more energy on technology cost reduction and efficiency increase. [0003] For tundish prefabricated parts, the current cost reduction is to replace high-quality magnesia particles with low-quality magnesia particles, and at the same time increase the content of magnesia fine powder and magnesia binder to improve ...

AI Technical Summary

Problems solved by technology

[0007] Aiming at the deficiencies of the prior art, the present invention provides a low-cost tundish prefabricated part and its preparation method, which solves the problem of replacing high-quality magnesia granules with low-quality magnesia granules, and at the same time Then increase the content of magnesia fine powder and magnesia binder to improve the thermal shock performance and high temperature flexural performance of the tundish prefabricated parts, but this method has the following problems, because low-quality magnesia is directly used instead of high High-quality magnesia, the replacement ratio of magnesia is low. Once the ratio of magnesia is increased, the prefabricated parts of the tundish will have poor thermal shock performance and low bending resistance at high temperature, which will affect the service life of the product. Other enterprises use other varieties of magnesium-containing raw materials Substitute magnesia and add it to the tundish prefabricated part. Although this method can increase the cost reduction, the yield is not high and it is difficult to guarantee the product performance.

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