High-strength magnesium refractory mortar for refining steel ladle

Abstract

The invention relates to high-strength magnesium refractory mortar for refining a steel ladle. The refractory mortar is prepared from the following raw materials in percentage by weight: 79 to 87 percent of magnesia, 5 to 10 percent of aluminum-magnesium spinel fine powder, 3 to 8 percent of active alpha-Al2O3 micro powder, 0.5 to 3 percent of SiO2 micro powder and 1 to 5 percent of magnesium aluminate gel powder, and 0.2-0.6% of sodium hexametaphosphate and 1-5% of carboxymethyl cellulose are additionally added. The steel ladle bonding agent has good bonding strength, still has high strength, high temperature resistance and scouring resistance under the conditions of a steel ladle refining process and high temperature, and solves the problem that brick joints are most easily eroded in steel ladle application.

Description

technical field [0001] The invention relates to refining ladle refractory mud, in particular to a high-strength magnesia refractory mud suitable for building refining ladle refractory bricks. Background technique [0002] High-quality steel usually undergoes molten steel refining and must be contained in refining ladles. Most of the working lining of the ladle is made of refractory bricks. The commonly used refractory bricks include magnesia carbon bricks, aluminum magnesia carbon bricks, magnesia aluminum carbon bricks, corundum prefabricated bricks, and aluminum magnesium prefabricated bricks. And these refractory bricks must be bonded with refractory mud to form a complete lining. If the performance of the fireclay is not good, the refractory brick joints will become the weakest link in the refining process. Expansion and falling of refractory bricks are important reasons for the penetration of molten steel into the working lining or the leakage of ladles. [0003] Chin...

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Problems solved by technology

[0007] The object of the present invention is to provide a high-strength magnesia refractory mud for refining ladles. The refractory mud has good bonding strength and still has high strength, high temperature resistance and erosion resistance under the ladle refining process and high temperature conditions, so as to solve the problem of ladle application. The problem that the brick joints are most likely to be corroded

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