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Crucible sand is a specialized blend of refractory materials, including silica and chromite, designed for filling the nozzle and sliding gate block in continuous casting crucibles.
The quality of crucible sand is determined by its composition, particularly the ratio of silica to chromite. Increasing the chromite content, typically ranging from 10% to 35%, enhances the performance and efficiency of the sand in steel production processes.
In steel manufacturing, using the right crucible sand is critical for ensuring efficient operation. After the molten metal is emptied from the crucible, it’s crucial to fill the duct with sand to prevent any residual melt from solidifying and blocking the nozzle for future use. If low-quality sand is used, the duct opening may be compromised, leading to delays and inefficiencies. High-quality crucible sand ensures nearly 100% duct opening, optimizing the flow rate and discharge efficiency of the molten metal.
The choice of crucible sand depends on factors such as crucible capacity, size, nozzle diameter, melt retention time, steel type, and temperature. Using the appropriate sand tailored to these parameters is essential for maximizing performance in steel production.
