Patent EA-004722-B1 (EA)
Title: Rotor for flotation mechanism and method for directing material flow in flotation machine
Inventor: BOURKE PETER
IPC: B03D1/16
Filed: 2001-07-19
Abstract: 1. A rotor (11) of a flotation mechanism (1) for concentrating of ores where the flotation mechanism is formed of a stator (2) with its blades (4) around a downward tapered rotor suspended on a hollow shaft (6) and which rotor is equipped with a cover plate (12,21) and essentially vertical rotor blades (8) which form chambers (9,15,19,20) inside the rotor, air being conducted through the shaft to the chambers, characterized in that the upper part of the chambers (15,20) under the rotor cover plate (12,21) are formed with aligning means (13) to be downward inclined from their outer edge (16,30) into the core (17,28) of the chambers so that they form an angle between 5 and 70 degree with the horizontal plane, the upper surface of a rotor cover plate (12,21) is inclined upwards raising from around the shaft (6) towards the outer edge (18,25) at an angle between 5 and 70 degree with the horizontal plane. 2. A rotor according to claim 1, characterized in that chambers (15,20) of the rotor (11) are equipped with a slurry directing plate (27) underneath the cover plate (21), which directing plate is joined from the outer edge (29) to the cover plate and from other sides to the rotor blades the directing plate reaching downward to the core (28) of the pumping chamber at an angle between 5 and 70 degree . 3. A rotor according to claim 1, characterized in that the rotor blades (8) form separate air chambers (9,19) and pumping chambers (20) of which the upper part of the pumping chambers (20) under the rotor cover plate (12,21) are formed to be downward inclined from the outer edge (18,25) of the rotor cover into the core (17,28) of the pumping chambers so that they form an angle between 5 and 70 degree with the horizontal plane. 4. A rotor according to claim 1, characterized in that the rotor cover plate (21) is equipped with an annular upper surface plate (22) which inner edge (23) is attached to the cover plate around the shaft (6), the upper surface plate raising from around the shaft towards its outer edge (24) at an angle between 5 and 70 degree with the horizontal plane. 5. A rotor according to claim 1, characterized in that the upper surface plate (22) is joined at its outer edge (24) to the outer edge (25) of the rotor cover plate with the aid of a vertical plate (26). 6. A rotor according to a preceding claim, characterized in that the surface of means (13,14) or plates (27,22) towards the slurry is straight. 7. A rotor according to a preceding claim, characterized in that the surface of means (13,14) or plates (27,22) towards the slurry is curved, concave or convex. 8. A method for directing a slurry flow in a mixing zone of a flotation machine with the aid of a flotation mechanism which forms of a stator around a rotor wherein the rotor is downward tapered and rotor blades under a cover form slots for slurry and/or air, the rotor being suspended from a shaft through which the air is conducted to the rotor, characterized in that in order to flotate coarse particles and having a high specific gravity, the slurry flow discharging the rotor is directed upwards, the slurry flow above the rotor is directed upwards. 9. A method according to claim 8, characterized in that the slurry flow discharging the rotor is directed upwards by formulating the upper part of the slots downward inclined from their outer edge into the core so that they form an angle between 5 and 70 degree with the horizontal plane. 10. A method according to claim 8, characterized in that the slurry flow above the rotor is directed upwards by inclining the upper surface of the rotor cover plate upwards raising from around the shaft towards the outer edge at an angle between 5 and 70 degree degrees with the horizontal plane. 11. A method according to claim 8, characterized in that coarse particles have a size above P80 =180 mkm.