Plastic repair material for ladle working lining

Abstract

The invention discloses a plastic repairing material used for a ladle working linear, which belongs to the field of fireproof materials. The weight percentage of the main materials of the repairing material are as follows: 5 to 70 percent of high alumina bauxite, 20 to 90 percent of corundum, as well as 4 to 20 percent of magnesia; moreover, silica sol accounting for 5 to 20 percent of the weight of the main materials is additionally added. The granularity of the high alumina bauxite is not more than 10mm; the content of Al2O3 is not less than 80 percent; the corundum comprises brown alumina, sub-white corundum, platy corundum, electrically-fused white corundum and the like; the magnesia comprises middle-grade magnesite, highly pure magnesite, electrically-fused magnesite, and the like; wherein, the MgO content thereof is not less than 93.0 percent; the content of SiO2 in the silica sol is between 20.0 percent and 40.0 percent; the content of Na2O is not more than 0.4 percent, and the pH range is between 8.5 and 12. The invention takes the silica sol as a wedding agent, has high material intensity and good sticking performance with a residual linear, and simultaneously enhances the intensity forming speed and the sticking thickness with the residual linear of the material under low temperature by employing a mechanism that the silica sol and the magnesia mutually promote for hardening, thus not only being capable of carrying out large area repairing to a ladle body, but also being capable of carrying out repairing to a part; moreover, the service life is long and the ladle circulation is quick.

Description

technical field [0001] The invention belongs to the field of refractory materials and relates to a repair material for the working lining of a ladle body. Background technique [0002] The steel ladle is an important equipment in the steelmaking production process, and the refractory material is the key to the steel ladle, which directly affects the turnover of the steel ladle and the normal operation of the continuous casting production line. At present, due to the application of ladle refining technology, the residence time of molten steel in the ladle is prolonged. At the same time, due to the introduction of a large number of refining agents and alloys, the corrosion of the refractory material of the ladle is also accelerated; The area is damaged too quickly and is out of service, while the other parts of the ladle are in better working condition and can still be used. This unbalanced corrosion of the ladle leads to increased material energy consumption and waste of res...

AI Technical Summary

Problems solved by technology

Among them, the gunning construction has the following disadvantages: 1. During the gunning process, the material rebounds much and the dust is large; 2. The gunning adhesion rate is greatly affected by the temperature, and the temperature of the ladle to be repaired is not easy to control; 3. The gunning material Cement, silicate and phosphate are mostly used as binders, and clay is used as plasticizer. Therefore, the material has high impurity content, poor high temperature performance, and is not resistant to erosion. It is also easy to pollute molten steel.

Since the combination of magnesia micropowder and silicon micropowder and the hydration reaction of magnesia micropowder proceed slowly at low temperature, the strength generation is slow and low. In the lower autumn and winter, especially in the north, it is easy to have problems such as low bonding strength and falling off of the repairing material due to the slow hydration of magnesium oxide, or the thickness of the repairing material cannot be too thick due to the low bonding strength.

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