Abstract:
The invention relates to a rotor (1) for a flotation machine for dispersing air into slurry around the ro- tor, the rotor comprising a body (2) equipped with a set of blades (3). The body (2) is assembled from ra- dial sector modules (9). The rotor comprises fastening means (10) for joining the sector modules (9) to each other. In the method for forming a rotor, radial sec- tor modules (9) are produced, and the rotor body (2) is assembled from a number of sector modules (9). Fi- nally, in the method for maintenance of a rotor, a damaged sector module (9) is detached from the body (2) and replaced by a defect-free sector module.
Abstract:
The invention relates to a method of using a flotation machine that is used in metallurgical processes and to a flotation machine. The flotation machine foams hydrophobic particles from anaqueous slurry that contains these particles. The flotation machine includes a flotation cell (1), and a rotor (2) that is inside the flotation cell. The rotor (2) is rotated at a mixing power, which maintains the suspension in the slurry and mixing of air with the slurry to form the foam, and the mixing power is controlled by adjusting the rotation speed of the rotor. The amount of solid matter S accumulated on the bottom of the cell (1) is determined, and the rotation speed of the rotor (2) is adjusted on the basis of the determined amount of solid matter. The flotation machine includes a measuring device (5) for determining the amount of solid matter accumulated on the bottom of the cell. The adjusting device (4) is arranged to adjust the rotation speed of the motor (3), which rotates the rotor (2), on the basis of the measuring result of the measuring device (5) to remove the solid matter from the bottom of the cell.
Abstract:
A mixer that is arranged to be used in a metallurgical process as mineral slurry conditioner or reactor. The mixer includes a container (1) comprising a vertical side wall (2) and bottom (3); and a mixer unit (4) provided with a drive shaft (5) that extends vertically in the container. The drive shaft is provided with an agitator (6); and with an electric motor (7) for rotating the drive shaft. The electric motor (7) is a permanent magnet motor provided with a vertical rotor axis (8), its lower end being fixedly connected directly to the upper end of the drive shaft (5).
Abstract:
The flotation machine includes a flotation cell (1), which comprises a vertical side wall (2) and a bottom (3), and which is upwards open. An air distribution and mixing device (4) is arranged in the vicinity of the bottom for distributing air to the slurry for forming froth and mixing the slurry in the flotation cell. The air distribution and mixing device includes a rotor part (5) that comprises air distribution apertures (6). A drive shaft (7) extends vertically in the flotation cell. The rotor part (5) is attached to the lower end of the drive shaft (7). The drive shaft comprises a hollow interior (8), which constitutes a flow channel for conducting flotation air to the air distribution holes (6) of the rotor part. An electric motor (9) is arranged to rotate the drive shaft (7). The electric motor is supported by a separate supporting framework (10), which is on top of the flotation cell. The electric motor (9) is a permanent magnet motor that comprises a vertical rotor axis (11), the lower end of which is in permanent contact directly with the upper end of the drive shaft (7).