Magnesium oxide precast refractory material and construction method thereof

Abstract

The invention discloses a precast magnesia refractory material, which is prepared by mixing and stirring the following component materials (100 percent by weight) uniformly: 59 to 72 percent of magnesia particles, 18 to 31 percent of magnesia powder, 0.5 to 6 percent of silica micropowder, 0.5 to 4 percent of aluminium micropowder, 0.05 to 0.3 percent of SHMP, 0.05 to 0.3 percent of STPP and 0.04 to 0.1 percent of organic fiber. The invention also discloses a construction method for the precast magnesia refractory material, which comprises the following steps of batching, stirring, vibrating, tapping, demoulding after final setting, and drying. The precast magnesia refractory material is high in magnesium and low in aluminum, and strong in slag resistance, has less pollution to liquid steel, and reaches or surpasses high aluminum-magnesia castable in bonding strength and thermal shock resistance.

Description

technical field [0001] The invention relates to a refractory material and a construction method thereof, in particular to a magnesia prefabricated refractory material used in a ladle of a steelmaking process and a construction method thereof. Background technique [0002] The ladle is an indispensable and important equipment in the steelmaking industry. As the refractory material for the inner lining of the ladle, several major changes have taken place. [0003] In the early years when the continuous casting ratio was very low, the lining of the ladle was built with wax stone bricks, clay bricks, high alumina bricks, etc., and some shot materials and ramming materials were also used. This kind of refractory material shows poor spalling resistance and erosion resistance during use, and its service life is low, only 10 times on average, and it can only reach about 20 times after treatment. Since then, magnesia-dolomite fired bricks have appeared. Because it is prone to therma...

AI Technical Summary

Problems solved by technology

This kind of inner lining has good integrity and significantly improves the service life, but it has a long baking time for the ladle and serious slag drop phenomenon. It is difficult to unpack for most small and medium-sized steel mills without special equipment.

In order to make up for this deficiency, aluminum-magnesium non-burning bricks have been developed. The lining bricks are easy to build, short baking time and easy to unpack, but there are still problems of easy slag removal and poor spalling resistance.

[0005] With the increase of continuous casting ratio and harsh working conditions of the ladle, the inner lining is seriously damaged, especially the slag line part, and the service life is short

With the promotion and application of continuous casting technology, the water glass combined with aluminum-magnesium ladle castables prevailing in the middle and late 1980s can no longer meet the life requirements of continuous casting ladles in my country.

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