In order to remove non-metallic inclusions, the tundish has a circulation tank and a floating tank.

A secondary treatment step is carried out in a neutralization tank, a coagulation tank and a flotation or a sedimentation tank, in order.

Molten steel cleaned therein is then poured via the bottom portion of the floating tank into a mold.

The slurry is agitated in the flotation vessel (2) for dispersing the gas bubbles into the slurry.

According to a material conveying direction, the system comprises a crusher, a flotation tank, a multifunctional friction separator, a rinse tank, and a dehydrator sequentially connected.

Molten steel so cleaned flows from the circulation tank into the floating tank, where non-metallic inclusions still remaining in so-cleaned molten steel float in a calm current therein.

A set of concentric, mutually spaced, conical plates (24) positioned in the floatation tank (14).

The system (1) is self-contained within a standard shipping container (40), with all components disposed in-line.

The foreign materials are removed from primary white water using a first dissolved air flotation tank, which is dehydrated in step (C).

The foreign materials are removed from secondary white water using a second dissolved air flotation tank, which is dehydrated in step (g).

Eriez’s HydroFloat can float particles up to 2,000 microns.

The heavier PET material will sink to the bottom of the flotation tank, from where it is removed.

A gas dispersing mechanism (4) feeds gas into the slurry (1) in a flotation vessel (2) to infuse gas bubbles into the slurry.