Ladle permanent lining and manufacturing method thereof

Abstract

The invention relates to a ladle permanent lining and a manufacturing method of the ladle permanent lining, and belongs to the technical field of ferrous metallurgy ladle lining fireproof material. The ladle permanent lining is laid on the inner wall of a shell (6) of a ladle and sequentially comprises a ladle bottom permanent lining (1), a ladle wall permanent lining (3) and a ladle nozzle permanent lining (10) from bottom to top. The ladle permanent lining is characterized in that the ladle permanent lining is manufactured by minimum-inflation artesian flow castable in a segmented casting mode, an overall casting forming die is not used, and the ladle permanent lining and a bricked working lining are constructed synchronously. The technological process of repairing and laying the ladle lining is simplified, the problem that in the prior art, the bricked working lining leaks steel because the high-aluminum artesian flow castable shrinks in the hardening process is solved, compared with the prior art, the service life of the ladle working lining is prolonged by 150 furnace round-200 furnace round, and the cost of ladle fireproof material is reduced by over 15%.

Description

technical field [0001] The invention relates to a permanent lining of a molten iron ladle and a preparation method thereof, and belongs to the technical field of iron and steel metallurgy inner lining refractory materials. Background technique [0002] The molten iron ladle is a container for shipping molten iron for steelmaking, and its inner lining generally includes a permanent lining and a working lining. At present, there are mainly two types of permanent linings for ladles: one is built with lightweight insulating bricks, the other is castable as a whole, and the working lining is generally built with dense clay bricks or aluminum silicon carbide bricks. In recent years, the integral casting technology of high-alumina self-flowing castables has been gradually popularized and applied in the permanent lining of domestic large and medium-sized ladles. However, the high-aluminum self-flowing castables produced by the prior art and their construction techniques have new co...

AI Technical Summary

Problems solved by technology

However, the high-aluminum self-flowing castables produced by the prior art and their construction techniques have new common technical problems in their practical application: (1) The process flow for preparing the ladle lining in the prior art is to cast the permanent lining as a whole first, and then The working lining is built after curing and baking, and the construction period is longer, which affects the turnover and use of the ladle and increases the baking cost of the permanent lining; (2) The pouring construction of the existing permanent lining castable for the ladle adopts integral pouring Tire mold, not only the cost of making the overall cast tire mold is high, but also the loading capacity of the molten iron ladle cannot be changed by adjusting the wall thickness of the permanent lining, so it cannot meet the requirements of the converter to change the loading volume of molten iron; (3) Production with existing technology High-aluminum self-flowing castables have poor thermal insulation performance and shrinkage during hardening. The line shrinkage after firing is generally -0.20% to 0.30%, which makes a ring gap between the permanent lining and the working lining, and the working lining is subjected to static iron. The pressure moves outwards, resulting in common technical problems such as iron infiltration after the brick joints of the aluminum silicon carbide bricks for the masonry working lining increase, which in turn affects the service life and turnover of the working lining, and increases the cost of refractory materials for the ladle

The disadvantage of this invention is that the castable permanent layer adopts an integral cast tire mold, which not only costs a lot to make the integral poured tire mold, but also has a long construction period, and it is impossible to change the ladle loading capacity by adjusting the wall thickness of the permanent lining, thus it is impossible Satisfy the requirements of changing the charging amount of molten iron in the converter

The disadvantage of this invention: the permanent layer is built with lightweight heat-insulating refractory bricks, and it will be removed after one service life cycle is used synchronously with the working lining, which cannot be reused, resulting in high cost and waste of resources

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