DD211494A1 - LEADING DEVICE FOR FLOTATION CELLS - Google Patents

Abstract

The invention relates to a guide for the foam discharge from flotation cells, in which the foam is discharged automatically or by means of paddles. It is to improve the spreading and / or selectivity in the flotation process, in which a guide has been developed, with which it is possible to match the discharge speed of the foam layer from the edge zones to the discharge speed of the foam layer in overflow proximity and certain favorable for the Flotationskennziffern To set dwell times. This object is achieved in that the guide element of a guide in the foam layer above the turbidity level is arranged adjustable and pivotable and completely or partially covers the foam layer.

Description

Title of the invention

Guide for flotation cells

Field of application of the invention.

The invention relates to a guide for discharging the foam from flotation cells, in which the foam is discharged independently or by means of paddles on an overflow weir.

Characteristic of the Known Technical Solutions A guiding device for discharging the foam from flotation cells is already known. It consists of a .jalousieartigen guide element, which is arranged below the foam layer in the flotation cell. The baffles forming the guide element run parallel to one another and are inclined in the direction of the overflow weir. The rising slurry with the embedded bubbles passes through the lattice of the louver and is deflected in the direction of the overflow weir. As a result, the foam bubbles should continue to store in the vicinity of the overflow in the foam layer and be discharged quickly (SU-UHS 56 869).

Although with the known guide a certain Zwangsleitung.der in the pulp rising bubble particle aggregates (hereinafter referred to as bubbles) in the direction of the overflow weir possible, but does not prevent the formation of a dead zone in the back wall of the flotation cell, so that the Discharge rate of the foam layer from the overflow weir in the direction of the cell back wall decreases rapidly. This is caused by the bubbles that follow the foam layer, which are also in the area of the discharge

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fill up again and again, resulting in a jam of foam formed in the back wall of the back wall. This different discharge rate prevents the generation of an approximately equal residence time of the bubbles in the foam layer. Thus, the bubbles rising at the height of the overflow weir are too fast and the bubbles rising in the dead zone are discharged too slowly. From. Disadvantage here is that too short residence time of the foam-not sufficiently dehydrated and thereby too many mountain particles are discharged with the? Fert3toff and at too long residence the heavy Wertmineralteilchen fall back into the pulp and at least ens lost in part, Moreover, it is known · Form the back wall of the flotation cell as a guide by giving it an inclination in the direction of the overflow weir (Cvetmetinformacija, Moscow (1970), 3. 6 - 26). This guide device has "the defect that the volume of the flotation cell and thus the performance of the same is limited.Also, no sufficient equalization of the discharge speed over the entire surface of the foam layer is achieved here, since in the interest of minimizing the volume reduction of the angle of attack of the rear wall small This device is rigid and can not be adapted to the technological objective.

Object of the invention

The aim of the invention is that depending on the technological goal spreading and / or selectivity in the flotation to make cheaper and to minimize the loss of valuable material or to achieve a reduction in the flotation capacity.

Explanation of the essence of the invention

Although the known guide devices can deflect the bubbles forming in the slurry in the direction of the overflow weir of the flotation cell, it is not possible to even out the discharge rate of the foam layer over its entire surface. This is caused by the fact that more bubbles are stored further downstream in discharge close to the foam layer through the incorporated into the slurry guide, the congestion in the edge

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Konen the foam layer rather reinforce than accelerate their discharge. The invention is therefore based on the object to develop a guide that allows the discharge speed of the foam layer from the edge zones to approach the discharge speed of the Schauines near the overflow weir of flotation cells or to influence the residence time spectrum so that an improvement in technological Codes is achieved. According to the invention, this object is achieved in that a guide element of a guide in a flotation cell above a boundary between a liquid level and a foam layer is arranged vertically adjustable and pivotable and completely or partially covers the foam layer.

Further features consist in that the guide element is preferably arranged on the rear wall of the flotation cell, rests on the foam layer at an angle of 5 to 85 ° to the liquid level and is designed plate-shaped or as a curved profile.

The effect of the invention is based on the fact that the bubbles exceeding the turbidity exert a pushing action on the foam layer. Thereby, the upper bubbles stored in the foam layer are pressed against the guide element and inevitably displaced in the direction of the discharge of the flotation cell, so that no congestion can form in the edge zones of the foam layer.

The invention will be explained in more detail below with reference to an exemplary embodiment and to drawings. The drawings show in

Fig. 1: a cross section through the flotation cell Fig. 2: Sn application in relation to the flotation time Fig. 3 j Sn application in relation to the enrichment.

embodiment

The guide 1 is arranged in the flotation cell 2 at the rear wall 3. The arrangement takes place at the boundary 4 between the liquid level 5 and the foam layer 6 in the flotation cell 2 or above it. The guide 1 forming the guide 1 consists of a corrosion-resistant material and covers the foam layer

partially. The guide 1 is arranged vertically displaceable on the rear wall 3 of the flotation cell 2. The inclination angle of the guide element 7 is adjustable by means of the axis 3 and is in this example 30 ⁰ to the liquid level. The most favorable inclination angle and the length of the guide element 7 is to be determined experimentally for each Sinsatzfall.

In flotation cells that carry foam on two sides,. are in the manner described 2 guide elements 7 in the middle of the cell to install. The effect of the guide 1 is based on the finding that the foam bubbles rising from the slurry 5 exert a pushing action on the foam layer 6. After the most effective setting angle for the guide element 7 is determined, it is rotated about the axis 8 and set to the desired angle, in the example 30 °. The axis 8 is thereby determined at the boundary 4 between the liquid level 5 and the foam layer or above. The rising in the vicinity of the rear wall 3 of the flotation cell 2. Foam bubbles deposit in the usual way in the foam layer 6 and are deflected in the foam layer 6 by the guide element 7 in the direction of the discharge of the flotation cell 2. The foam bubbles that follow from the pulp 5 press from below onto the foam layer 6, so that the upper foam bubbles located in the foam layer are pressed against the underside of the flow element and are directed by it in the direction of the discharge. As a result of this positive guidance and the thrust action of the foam bubbles which follow the slurry 5, the discharge rate also increases in the edge zones of the foam layer 6, since congestion is avoided.

As shown by the experiments on the flotation of a tin ore, a different depth of immersion in the foam layer may vary the time of the shower bubbles in the foam layer As shown by the results in Fig. 2, a higher yield per unit time can be achieved From Fig. 3 it can be seen that in addition to the yield improvement, a more favorable ratio between spreading and enrichment can be achieved.

Similarly good results were obtained with sulfidic ores and

reached a CaFp / CaSO ^ drive.

Me guide according to the invention is in all self-. active or paddle-carrying flotation apparatus in which a mineralized 3-phase foam is withdrawn applicable.

It is particularly advantageous that all these flotation apparatus can be retrofitted with little effort, By the Aasnutzung the thrust of the rising in the pulp bubble particle aggregates in the edge zones of the foam layer, a cooperation with the guide element reaches a higher discharge rate, so that the rate constant improved. As a result, the spreading and / or the selectivity in flotation cells is made more favorable. Clay advantage is also that the volume of the flotation cells need not be limited, since the guide rests on the foam layer. By improving the selectivity, the post-purification or "capacity in ground and control flotation can be reduced, which reduces the cost.

Claims (4)

Erfindungsansρruch "U guiding device for flotation cells for discharging the foam with a guide element inclined in the direction of a discharge of the flotation cell, characterized in that the guide element (7) in the flotation cell (2) above a boundary (4) between a liquid level (5) and a foam layer (6) is arranged vertically adjustable and pivotable and the foam layer (6) completely or partially covered. 2. Guide device according to item 1, characterized in that the guide element (7) is preferably arranged on a rear wall (3) of the flotation cell (2). In flotation cells that carry out the foam on 2 sides, 2 guide elements (7) are to be installed parallel to the foam overflow edge. 3. Guide device according to item 1, characterized in that the guide element (7) rests at an angle of 5 to 85 ° to the liquid level (5X on the foam layer (6). 4. Guide device according to item 1, characterized in that the guide element (7) is plate-shaped or formed as a curved profile ». ' See 3, Seue drawings