#low nozzle

[chinaelong]

Ladle upper/lower nozzle series are developed with the newest matrix optimization technology and the theory of the most compact. They are characterized by good thermal shock resistance, strong washout resistance, steady quality and long life.  

[chinaelong]

Methods of Eliminating the Phenomenon of Ladle Nozzle Clogging

  A ladle nozzle is one of the slide gate ceramic elements. Systematic extension of the length of the steelmaking ladle campaign increases the demands on a ladle nozzle. The ideal solution would be a ladle nozzle which withstands the entire ladle campaign. In addition to thermal stability, ladle nozzles must be characterized by high resistance to corrosion and erosion caused by the flow of steel. An important factor affecting the durability of a ladle nozzle is clogging due to steel deoxidation products deposition in the nozzle channel. The phenomenon of clogging makes it difficult to regulate the rate of steel outflow from the ladle and, in extreme cases, can make the nozzle channel close. Clearing the nozzle by oxygen lancing accelerates its destruction. Methods to prevent clogging:

1. Ladle Refining Practice. A vacuum degassing treatment yields better cleanliness than does argon bubbling.

2. Reoxidation Prevention. Submerged ladle-to-tundish pouring, shielded tundish surface, ann leak-tight refractory joints will reduce exposure of the steel to oxygen and thereby improve cleanliness.

3. Oxygen absorber Prevention.Optimal tundish flow patterns as well as filtration and electromagnetism techniques can remove Oxygen absorber products from the melt.

4. Flux Enrainment Prevention. Submerged ladle-to-tundish pouring and avoidance of ladle slag carryover will reduce the amount of exogenous inclusions in the melt.

[chinaelong]

The requirements of refractory sliding nozzle

Sliding nozzle mainly stalled in the bottom of ladle, whose applied condition has got a big improvement comparing with plug, as its refractory part does not soak in molten steel for a long time. To sliding nozzle, slide gate is the key section, as its quality influences life span of nozzle directly.

The lower/upper nozzle only as a role of alleyway for steel running, but the upper nozzle is required to resist high temperature and eroding, which has the same life span of ladle well block. The lower nozzle is only used for one time, so which holds less demand than upper nozzle.

Both of upper/lower sliding plate are beard fastening pressure, and also required to slid and no molten steel overslow between them when pouring. So it is required to take finish machining to slip plan of upper and lower sliding plate, to make sure high parallelism and smoothness, besides, both of them are required rather high mechanical property.

Now the material of sliding plate mainly include: High alumina, Magnesia, Aluminum silicon carbide, Aluminum chromium, Aluminum carbon, and Aluminum zirconium carbon.

Above materials can be made into burned and unburned skateboarding brick.

As high quality sliding plate is expensive, one can choose  compound sliding plate, which is more appliable and economical.