Baking-free self-hardening tundish working lining repairing material and using method thereof

Abstract

The invention relates to a baking-free self-hardening tundish working lining repairing material and a using method thereof, and the baking-free self-hardening tundish working lining repairing materialis composed of the following raw materials in parts by weight: 80-85 parts of MgO aggregate, 10-13 parts of binding agent, 3-5 parts of water and 3-4 parts of superfine silica-alumina powder. When the tundish is prepared, the MgO aggregate, the binding agent, the superfine silica-alumina powder and the water are stirred and mixed according to the proportion to prepare a working lining material, the space between a permanent lining of the tundish and a working lining mold is filled with the evenly-mixed working lining material, ramming and jolt ramming are conducted, standing is conducted for2-6 hours at the room temperature, and demolding is conducted. The repairing material does not need to be heated and baked, the turnover rate of the tundish can be effectively increased, energy is saved, and the operation cost is reduced.

Description

Technical field[0001]The invention relates to the technical field of refractory material preparation, in particular to a baking-free self-hardening tundish working lining repair material and a method of use thereof.Background technique[0002]The tundish is a refractory container used in the short-process steelmaking process. It first receives the molten steel poured from the ladle, and then distributes it to each mold through the tundish nozzle. The refractory lining of the tundish mainly includes a thermal insulation layer, a permanent layer and a working layer.[0003]That is, according to the steelmaking process requirements, after each tundish is continuously cast with 6 to 7 furnaces of molten steel, it must be replaced and the inner lining of the tundish must be repaired to ensure safe production. This process is also referred to as tundish preparation. Usually spreads or dry materials are used to repair the working lining, but the commonly used spreads or dry materials need to b...

AI Technical Summary

Problems solved by technology

This process is also called the preparation of the tundish. Usually, the working lining is repaired with smear or dry material. However, the commonly used smear or dry material needs to be baked offline for a long time at a low fire, which not only consumes a lot of energy, but also Moreover, the preparation time is long, and a certain amount of tundish needs to be equipped to meet the turnover needs, which affects the production rhythm and increases the operating cost