Ladle liners are available in the following compositions and are usually matched for chemical compatibility:
- Alumina Zirconia
Ladles are available in sizes ranging from 100# to 600# in either open or bottom pour designs. Bottom pour or tea pot designs are preferential as they pour from the bottom so there is less chance of slag or impurities being introduced into the molds. Preheating the ladles is required to avoid loss of tap temperature. If possible, it is recommended to preheat the ladles upside down so any build-up that may occur in the ladle is free to fall out. Higher preheat temperatures and more efficient fuel use can be recognized in this practice.
While melting practices vary widely, it is recommended to establish parameters on the number of heats the ladle is used for prior to retiring it. Far too often, the ladle is used too long, resulting in slag build up and the potential for impurities entering the molds. It is the last product the metal encounters prior to introducing the metal to the mold and an established number of heats to maintain a clean ladle can prove cost effective versus the added costs of inclusions in the castings.
The height of the bridge may be altered to accommodate a more even and smoother pour if a very fast pour rate is required. The pouring lip can also be altered to achieve a desired pour stream.
Silica ladles generally do not require to be installed in a steel ladle with a rammed back up refractory. They are less expensive than alumina ladles. However, they may be consumed much more frequently. The justification will vary depending on each foundry’s individual requirements.
Contact us today with your ladle liner requirements to see what can be offered in both product and experience. (203) 265-7112