Degassing and porous plugs
Degassing of molten metal can be effected with various gases including nitrogen (sometimes with small percentages of hydrogen for nonferrous metals), argon, SF6 on the basis of the needs of the sector in question, of individual companies and the objectives to reach in terms of the quality of the product (castings, billets…).
The main technologies offered by SOL for degassing include:
Lances: simplicity of application makes them ideal for basin furnaces where the mechanical mixing action favours de-slagging, bringing to the surface any solid and gaseous content in the bath and making the molten metal more homogeneous.
Porous plugs: the gas is blown into the bath through special porous plugs installed on the bottom and the finely dispersed bubbles as they rise from the bottom scorify the molten metal. Ideal for interventions in base and aluminium furnaces, they guarantee excellent degassing, in addition to the mechanical mixing action providing better thermal and chemical homogeneity which is extremely important for improving the quality of the fluid.
Porous plug systems can also be implemented for applications in the glass, special alloy, cast iron and steel industries.
Rotating distributors: these offer efficient scorification while reducing treatment times. The metal is stirred by an immersed rotor that injects the gas, providing optimal efficiency because with the same quantity of gas the exchange surface increases.