FI67498B - SJAELVBAERANDE BOTTENKONSTRUKTION FOER BASSAENGEN TILL EN FLOTATIONSCELL - Google Patents

Description

1 67498

Self-supporting bottom structure of the flotation cell basin

The bottom of the basin of the cylindrical flotation cell according to the invention consists of at least two conical parts. The comic legs are attached to the uppermost conical part and the legs together with the conical parts form a rigid, self-supporting structure for support.

As used in the text, a flotation cell refers to a unit consisting of a flotation mechanism, gutters, and a basin. By flotation machine is meant a flotation line consisting of one or more flotation cells.

The basins of the most commonly used flotation machines have a rectangular cross-section and a horizontal bottom. With the development of flotation machines going to larger and larger basins, it is becoming increasingly difficult to stiffen the walls of a rectangular basin. The piping of substances entering and leaving the pool must be placed next to the pool in a flat-bottomed pool, so that the pool and the entire flotation machine require more space than the cross-sectional area alone would require. A flotation device is also known according to patent application DE 29 06 599, in which the cross-section of the cell basin is circular. However, the bottom of the basin is horizontal and in the middle of the bottom is a sludge inlet pipe with a pump impeller placed on the drive shaft below the bottom level and impingement plates around it for dispersion.

According to the present invention, there is an entire cell basin; both the cylindrical part and the pool consisting of at least two conical parts and legs have been made self-supporting precisely by means of the base structure. The purpose of the base structure has been to follow, with the aid of two or more cones, a rope curve resulting from a vertically supported, free-falling rope at both ends. The conical sections are further supported by triangular legs connected to the uppermost conical section. - The essential features of the invention are set out in claim 1.

The invention is described in more detail on the basis of the accompanying figures, in which 2 67498

Figure 1 is a cross-section of a cell according to the invention and the bottom structure of its basin, and

Figure 2 is a section A-A of Figure 1.

Figure 1 shows a flotation cell 1 with a flotation mechanism 2 with drive shafts and defrosting tensioners 3 in the middle. four, but can also be, for example, six. The inlet connections 8 for the sludge fed to the cell are at the upper edge of the upper cone part 5 and the waste outlet connections 9 at the upper edge of the bottom cone 6. According to the figure, air can be led under the flotation mechanism 2, if necessary, from the center of the base upwards together through 10.

It can be seen in more detail from Figure 2 that the legs 7 of the basin are triangular and are attached to the upper conical part 5. The legs 7 of the basin are made of sheet metal by bending and can be attached in any suitable way, e.g. by welding.

As can be seen in Figure 1, the inlet and outlet connections of the cell can be suitably placed at or near the base formed by the cones. Placing the piping under a conical base reduces the need for space around the cells, and when the flotation cells thus designed are placed in series as a flotation machine, the space required by them is considerably smaller than if the cells were, for example, flat-bottomed.

Figure 1 shows one way of arranging the input and output connections of the cell. However, the sludge inlet connections can also be located at the same height at the top of the bottom cone as the outlet connections. In some cases, again, it may be advantageous to place both the outlet and the inlet connections at the top of the upper conical part, or the outlet connections are above the inlet connections. The inlet and outlet connections can also be placed at an angle of about 30o to the flotation machine line consisting of several cells, whereby the connections are located in free spaces with respect to the flotation machine line.

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The base structure consisting of cones is more economically flowable than a flat base. However, the most important part of a floor plan consisting of conical parts is the stiffening of the structure. The cylindrical part of the basin is supported by annular flanges and beams, but the self-supporting of the whole structure has been achieved by means of a floor plan. As a whole, a cylindrical pool can be stiffened more simply than a pool of rectangular cross-section with a corresponding volume; the cylindrical basin becomes lighter and thus material and manufacturing labor costs are lower.

Claims (5)

67498 Bottom structure of a flotation cell, characterized in that the bottom of the cylindrical flotation cell (1) consists of at least two conical parts (5, 6), the cell outlet and / or inlet connections being at the top of the bottom cone (6) and the air inlet (10) ) is at the bottom of the cell, at its center, and the conical portions (5,6) of the bottom together with the legs (7) fixed to the bottom form a self-supporting structure of the cell. Bottom structure according to Claim 1, characterized in that the basin legs (7) are fastened to the uppermost conical part (5). Bottom structure according to Claim 1, characterized in that the legs (7) attached to the bottom of the basin are triangular. Bottom structure according to Claim 1, characterized in that the lower bottom cone (6) is more gentle than the upper cone parts. A bottom structure according to claim 1, characterized in that the inlet and outlet connections associated with the bottom structure of the cell are at an angle of about 30 ° to the flotation machine line consisting of several cells.