a mgo-al 2 o 3 High-temperature hot-state repair material and method of use thereof

Abstract

The invention discloses a MgO-Al2O3 based high-temperature thermal-state repairing material and an application method thereof. The MgO-Al2O3 based high-temperature thermal-state repairing material comprises following ingredients, by weight, 65 to 80% of magnesia with a particle size of 5 to 0mm, 6 to 20% of magnesium aluminate spinel with a particle size of 1 to 0mm, 3 to 6% of aluminum oxide micro powder with a particle size of 10 to 0<mu>m, and 5 to 12% of a metal heat generating agent with a particle size of 0.074 to 0mm, wherein the metal heat generating agent is a magnesium aluminum metal composite powder, and the Mg to Al ratio of the magnesium aluminum metal composite powder is 4:1-1:1. According to the application method, the MgO-Al2O3 based high-temperature thermal-state repairing material is delivered through a transmission pipeline; oxygen, or a mixed gas of oxygen and the air, or the air is taken as a carrier and a combustion-supporting gas; the MgO-Al2O3 based high-temperature thermal-state repairing material is sprayed onto parts of high-temperature furnaces which are to be repaired via spray guns, the temperature of the high-temperature furnaces is maintained to be higher than 800 DEG C in repairing, and exothermic reaction of the metal heat generating agent with oxygen is induced by generated heat energy, so that partial melting softening of the MgO-Al2O3 based high-temperature thermal-state repairing material is realized before depositing onto matrix fire resistant material substrates; and at the same time the surfaces of the matrix fire resistant material, which are to be repaired, is softened and melted, the matrix fire resistant material is firmly bonded with the MgO-Al2O3 based high-temperature thermal-state repairing material, and service of the furnaces is prolonged.

Description

technical field [0001] The invention relates to the technical field of refractory materials, in particular to a MgO-Al 2 o 3 High temperature thermal repair material and method of use thereof. Background technique [0002] MgO-Al 2 o 3 High-temperature furnaces lined with basic refractory materials are widely used, not only because MgO-Al 2 o 3 The high temperature resistance of high-quality materials is also due to their good resistance to alkaline slag erosion, so they are widely used in iron and steel metallurgy and cement industries. [0003] For example, steelmaking and refining furnaces use high temperature resistant MgO-Al 2 o 3 The refractory material is used as the working lining, which is eroded and infiltrated by molten steel and slag during the application process. The refractory lining often suffers from melting loss, cracking and peeling, which leads to the reduction of the service life of the high-temperature furnace and the early offline. Seriously da...

AI Technical Summary

Problems solved by technology

These repair methods can prolong the service life of iron and steel smelting furnaces, but at the same time, there are many disadvantages: the gunning material contains water, and under the hot repair condition of thousands of degrees, the water evaporates rapidly, which affects the adhesion of the material, resulting in low bond strength Affect the service life, high material rebound rate leads to high material consumption; water is also very unfavorable to the red-hot repaired layer, rapid cooling sometimes causes the repaired layer to crack and peel off, which affects the life of the furnace body

However, this technology is also not suitable for repairing high-temperature furnaces and harsh conditions of use.

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