Method for constructing a flotation apparatus, flotation apparatus, method and system for flotation and use

1. A method for constructing a flotation apparatus, the method comprising:

providing a flotation vessel and a cover for closing an upwards open opening of the flotation vessel, wherein the cover and the vessel limiting a vessel space for receiving fluid,

providing an agitating means having a rotatable shaft,

arranging the rotatable shaft of the agitating means to extend through a first aperture in the cover,

supporting the rotatable shaft at a bearing housing outside the vessel space,

providing a connection arrangement that surrounds the rotatable shaft between the bearing housing and the cover,

attaching the connection arrangement to the bearing housing and to the cover so that the connection arrangement hermetically sealing the rotatable shaft between the bearing housing and the cover,

providing a connection arrangement comprising a connection piece surrounding the rotatable shaft between the bearing housing and the cover,

the connection piece that is provided comprising at an end facing the bearing housing a first opening for the rotatable shaft,

the connection piece that is provided comprising at an end facing the vessel space of the flotation vessel a second opening for the rotatable shaft,

the connection piece that is provided comprising at least two connection piece parts releasable connected to each other so that division planes between said least two connection piece parts extending between the first opening and the second opening,

providing a gas feeding means comprising a gas feeding duct in the rotatable shaft of the agitating means, outside the vessel space a gas inlet for feeding gas into the gas feeding duct, and inside the vessel space a gas outlet for feeding gas from the gas feeding duct into the vessel space,

connecting the gas feeding means in fluid connection with the vessel space, and

arranging the bearing housing between the gas inlet and the cover.

2. The method according to claim 1 , wherein

the connection piece that is provided comprising a hollow truncated cone surrounding the rotatable shaft between the bearing housing and the cover the connection piece, so that the hollow truncated cone tapers towards the bearing housing, so that the connection piece having at the end facing the bearing housing the first opening for the rotatable shaft, and so that the connection piece having at the end facing the vessel space of the flotation vessel the second opening for the rotatable shaft.

3. The method according to claim 1 , wherein

the connection piece that is provided comprising a first flange at the end facing the bearing housing, and

releasable fastening the connection piece to the bearing housing by using the first flange.

4. The method according to claim 1 , wherein

the connection arrangement that is provided comprising a bellow arrangement surrounding the rotatable shaft between the bearing housing and the cover.

5. The method according to claim 4 , further comprising:

arranging the bellow arrangement between the cover and the connection piece, and

arranging the connection piece between the bearing housing and the bellow arrangement.

6. The method according to claim 5 , further comprising:

attaching the bellow arrangement to the connection piece by means of a second flange, and

attaching the bellow arrangement to the cover by means of a third flange.

7. The method according to claim 6 , further comprising:

connecting the second flange being with the third flange by means of a travel limiter to limit the travel of the second flange with respect to the third flange.

8. The method according to claim 1 , further comprising:

supporting the rotatable shaft additionally at an additional bearing housing so that the gas inlet is situated between the bearing housing and the additional bearing housing.

9. A flotation apparatus comprising:

a flotation vessel and a cover for closing an upwards open opening of the flotation vessel, wherein the cover and the flotation vessel limiting a vessel space for receiving fluid, and

an agitating means having a rotatable axis extending through a first aperture in the cover,

wherein the rotatable shaft being rotatable supported at a bearing housing outside the vessel space,

and further comprising:

a connection arrangement surrounding the rotatable shaft between the bearing housing and the cover, wherein

the connection arrangement being attached to the bearing housing and to the cover so that the connection arrangement hermetically sealing the rotatable shaft,

the connection arrangement comprising a connection piece surrounding the rotatable shaft between the bearing housing and the cover,

the connection piece having at the end facing the bearing housing a first opening for the rotatable shaft,

the connection piece having at the end facing the vessel space of the flotation vessel a second opening for the rotatable shaft,

the connection piece comprising at least two connection piece parts releasable connected to each other,

division planes between said least two connection piece parts extending between the first opening and the second opening,

the apparatus comprising gas feeding means for feeding gas into the vessel space,

the gas feeding means comprising a gas feeding duct in the rotatable shaft of the agitating means, outside the vessel space a gas inlet for feeding gas into the gas feeding duct, and inside the vessel space a gas outlet for feeding gas from the gas feeding duct into the vessel space, and

the bearing housing being arranged between the gas inlet and the cover.

10. The flotation apparatus according to claim 9 , wherein

the connection piece comprising a hollow truncated cone,

the connection piece tapering towards the bearing housing,

the connection piece having at the end facing the bearing housing the first opening for the rotatable shaft, and

the connection piece having at the end facing the vessel space of the flotation vessel the second opening for the rotatable shaft.

11. The flotation apparatus according to claim 9 , wherein

the connection piece comprising a first flange at the end facing the bearing housing for releasable fastening the connection piece to the bearing housing.

12. The flotation apparatus according to claim 9 , wherein

the connection arrangement comprising a bellow arrangement surrounding the rotatable shaft between the bearing housing and the cover.

13. The flotation apparatus according to claim 12 , wherein

the bellow arrangement being arranged between the cover and the connection piece, and

the connection piece being arranged between the bearing housing and the bellow arrangement.

14. The flotation apparatus according to claim 13 , wherein

the bellow arrangement being attached to the connection piece by means of a second flange, and

the bellow arrangement being attached to the cover by means of a third flange.

15. A connection arrangement for use in a method according to claim 1 , comprising:

a connection piece,

having at a first end a first opening for the rotatable shaft and having at a second end a second opening for the rotatable shaft,

the connection piece comprising at least two connection piece parts releasable connected to each other,

division planes between said least two connection piece parts extending between the first opening and the second opening,

the connection piece comprising a first flange at the first end for releasable fastening the connection piece to the bearing housing, and

the connection piece comprising a second flange at the second end housing for releasable fastening the connection piece to a bellow arrangement.