Drive module and its uses, a flotation plant and a method of changing of the drive module

1. A drive module selectively detachable from flotation tanks of a flotation plant, wherein the drive module is a self-supporting structure being transferable and hoistable as an integral entity, the drive module comprising:

a self-supporting framework having a shape of a rectangular parallelepiped, the self-supporting framework defining an inner space within the self-supporting framework, and

at least two drive units, the at least two drive units being supported to the self-supporting framework in the inner space of the self-supporting framework, each of the at least two drive units including a drive shaft having a connection flange supported thereon, wherein the connection flange of each of the at least two drive units is located at the bottom of the inner space and is connectable to an external rotatable shaft for the rotation of the rotatable shaft, the rotatable shaft being located outside the drive module.

2. The drive module according to claim 1 , wherein the drive unit comprises:

a motor; and

a reduction gear connected to the motor, the motor comprising an output shaft, the output shaft being connected to the reduction gear, and that the drive unit comprises a drive shaft, the drive shaft being connectable to the reduction gear and the drive shaft is connectable to the external rotatable rotor shaft.

3. The drive module according to claim 2 , wherein the drive module comprises:

a frame, the frame being fixed to the self-supporting framework and configured to support the motor, the reduction gear unit and the drive shaft.

4. The drive module according to claim 1 , wherein the drive module comprises:

a gas feed pipeline for supplying flotation gas.

5. The drive module according to claim 4 , wherein the gas feed pipeline is located in the inner space of the self-supporting framework above and offset in relation to the drive units.

6. The drive module according to claim 4 , wherein the drive module comprises:

a flow meter connected to the gas feed pipeline for measuring the rate of flow of the flotation gas.

7. The drive module according to claim 4 , wherein the drive module comprises:

a flow rate controller connected to the gas feed pipeline for regulating the rate of flow of the flotation gas.

8. The drive module according to claim 1 , wherein the drive module comprises:

measurement equipment for the measurement of liquid level in a flotation tank, when in use.

9. The drive module according to claim 1 , wherein the drive module comprises:

a froth camera for detecting bubble size of a froth, when in use.

10. The drive module according to claim 1 , wherein the self-supporting framework comprises a maintenance platform.

11. The drive module according to claim 1 , wherein the self-supporting framework comprises a cable tray for supporting electric cabling.

12. The drive module according to claim 1 , wherein the self-supporting framework is made of metal beams to form a rectangular parallelepiped.

13. The drive module according to claim 1 , wherein the drive module comprises 2 to 6, preferably 2 to 4, drive units.

14. A flotation plant comprising a drive module according to claim 1 .

15. A method of operating the drive module, comprising:

providing a drive module according to claim 1 ; and

separating material by flotation based on differences of buoyancy properties of substances, or

separating solid material by froth flotation based on differences of hydrophilic properties of substances, or

concentrating ore by froth flotation, or

flotation of substances containing abrasive material, or

froth flotation of ore containing pyrite, silica, or chromite.