* Process C:
Degassing unit X, and flux A preliminary evaluation on filtration was conducted in transfer pump model 2.
"Our experiments showed that a plate sonotrode gave a continuous
degassing efficiency of at least 50 per cent in the melt flow rising to 75 per cent in batch operation.
It has been shown that the amount of hydrogen can be decreased to levels lower than in the case of Ar
degassing, with much less dross formation.
Consumption of aluminium should be sufficient for ensuring removal of excessive oxidation (difference between really measured oxidation and minimal amount of oxygen, necessary for decarburization) in the semi-finished product, and at the same time it should not prevent reaction process of vacuum-oxygen decarburization of the metal in
degassing (Figure 2).
Despite the effectiveness of helium as a
degassing agent, though, some researchers shy away from using it because it can prove expensive, and the stocking of unwieldy canisters can be a hassle.
Revisions to the rule may result in greater emission reductions through improved incentives to move fluxing operations from melting furnaces by installing more efficient in-line fluxing and
degassing units.
David Stevens, BVPI's Sulfur Recovery Technology Manager, said "The MAG
degassing system concept was developed to utilize the benefits of
degassing in the presence of air without the use of a costly and troublesome compressed air source.
"Vacuum
degassing causes hydrogen to diffuse and separate from the liquid
Issues with hydrogen control when
degassing become exaggerated when a process requires an intermediate level of hydrogen.
The ARE-500 stores five different sets of mixing and
degassing conditions (time and speed per mode) in a single batch cycle which consolidates otherwise time consuming formulation into a single step, completing in seconds to minutes what might otherwise take a great deal longer.