Usage requirements for converter slag-blocking balls
2025-09-02
Skimming Slag balls are spherical. Their density is between that of steel and slag (generally 4.2-4.5 g/cm³). They block the taphole at the end of tapping, preventing slag from flowing into the ladle. Flow channels are distributed around the outside of the ladle, allowing the slag to reach the taphole with the flow of slag.
Some important requirements for using slag balls:
1. How to determine the timing and placement of slag balls?
When tapping is about 3/4 of the way through, use a dedicated device to drop the slag balls from above the taphole, 500 mm above the slag surface, for optimal slag blocking.
2. How to evaluate the effectiveness of slag balls?
The effectiveness of slag balls can be assessed by observing the shape of the molten steel at the taphole. Effective slag blocking should occur when the molten steel flows out in a circular pattern. The color of the slag can also be used to determine the effectiveness.
3. How to evaluate the performance of slag balls after use?
The effectiveness of slag balls can be assessed by measuring the thickness of the slag layer in the ladle and the alloy yield. A smaller slag layer thickness results in a higher alloy yield, and thus a better slag retaining effect.
4. What is the purpose of the grooves on the slag retaining ball? How is it calculated?
The grooves on the slag retaining ball facilitate the outflow of molten steel during the slag retaining process.
The formula for calculating the groove volume is: V1 = groove area * groove length = πr²/2 * L
5. What data should be recorded during the field test?
Data required for field testing include: tapping temperature, slag retaining ball usage time, slag layer thickness, and alloy yield.
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