Patent ID: 8888075

Claim:
A device for adding a gas and/or particles to a liquid, including liquid metal, the device comprising: a rotor which is driven immersed in the liquid, wherein the rotor comprises a hollow rotational body with a first, inner annular wall extending downwards, forming a centrally arranged cylindrical hollow room with an opening directed downwards, wherein the rotor is provided with at least one radially arranged opening extending through the first inner annular wall, and with a second annular wall arranged outside and concentrically arranged with the first annular wall, together forming a downwardly open and upwards closed annular chamber in fluid communication with both the central room through said at least one radial opening and with the surrounding fluid through one or more openings arranged in the lower part of the second annular wall, the first annular wall extending below the lower end of the second annular wall, and the one or more openings of the first annular wall being positioned at a level below the one or more openings in the second, surrounding wall.