Ladle is used in steelmaking, foundry open hearth, electric furnace or converter before the container to undertake the molten steel, and then undertake the molten steel for the implementation of pouring operations, the quality of the general ladle affects the efficiency of smelting and transfer, and the main factor affecting the ladle is the castable when building the ladle, the quality of the ladle castable affects the quality of the ladle, colleagues also affect the service life of the ladle, so we must choose a good ladle castable when choosing.
1. The composition and characteristics of ladle castable.
The ladle castable is generally mainly made of corundum, aluminum-magnesium spinel, fused magnesia and other raw materials as aggregates, and then added some admixtures, and then made by micronized powder combination technology, it has good slag resistance, spalling resistance, thermal shock resistance, good strength and volume stability, etc., and also has the characteristics of high refractoriness, strong corrosion resistance, high adhesion rate, low resilience, easy to spray, etc., can resist the erosion of molten iron and slag, and can be quickly baked without bursting, easy to repair and dismantle.
Second, the application of ladle castable.
Ladle castable is generally suitable for pouring large and medium-sized ladle walls, and is also used in various metallurgical industry stoves, and is widely used in metallurgy, petroleum, chemical, building materials, electric power and other smelting industries.
3. Precautions for the construction of ladle castable.
1. Before construction, it is necessary to achieve three links (water pass, electricity pass, road pass), the site is level, and the construction conditions are met
2. The construction site and the apparatus should be cleaned before construction to ensure the cleanliness of the appliances to prevent the pollution of the ladle castable and reduce the performance of the material
3. The storage of ladle castable must be in a dry environment, and it is strictly forbidden to be exposed to moisture or rain
3. During construction, the dry material should be stirred first, the general time is 2-3 minutes, to ensure the full integration and uniform distribution between the aggregate and additives, and then start to add water to stir, pay attention to the water must be pure water, and at the same time strictly control the water consumption, generally add water about 52~5.5%, the water addition process should be uniform and appropriate, and the viscosity of the raw materials after adding water must meet the requirements
4. It is advisable to use a plug-in vibrating rod to turn the slurry during the pouring time shadow, and pour it in place at one time
5. The castable should be used at one time, and it is forbidden to mix it twice
6. After the construction is completed, the materials are completely solidified, and the ambient temperature is naturally oxidized, and then the temperature is heated and dried.
The above is the composition, application and construction precautions of ladle castable, in addition to the quality of raw materials, construction is also very critical, and the construction will also lead to the falling off or cracks of the castable, affecting the service life.