DE1236431B - Agitator flotation cell - Google Patents

Description

FEDERAL REPUBLIC OF GERMANY

GERMAN

PATENT OFFICE

EDITORIAL

Int. α .:

B03d

German KL: Ic-5

Number: 1236431

File number: B 83689 VI a / l c

Registration date: September 11th 1% 5

Open date: March 16, 1967

The invention relates to an agitator aotation tent with a radially daicfrströmts-a, afe closed impeller. '

In known agitator flotation cells of this type, the pulp and the air are centralized from above sucked in centrally from below and both components radially in the impeller designed as an impeller accelerated. The coarse-bubble turbid-air mixture that initially forms is then counteracted thrown an annular diffuser through which the turbid-air mixture is made into fine bubbles target. The disadvantage of these known agitator flotation cells is the high energy consumption and the great wear and tear.

There are also known flotation cells in which the pulp is above a perforated plate, through the air under excess pressure in the form of bubbles of the pulp in the flotation cell is fed. A particular disadvantage of these known flotation cells is that the pulp stands practically still above the perforated plate and consequently the bubbles only move away from the perforated plate Remove the plate when the vesicles have grown so far that their buoyancy can adhere to it the perforated plate overcomes. In addition, it is a disadvantage of these known flotation cells that the Bubbles penetrate the turbidity only with low energy and correspondingly low speed and accordingly the bubbles only penetrate slowly attach to the corresponding solid particles.

The object of the invention is to find a way, while avoiding the disadvantages of the known flotation cells, to direct the air in to bring fine-bubble state into the sludge, with one for rapid deposition of the Air bubbles on the corresponding solid particles at sufficient speed. The invention In the case of an agitator flotation cell, there is the at the beginning mentioned type in that on the top and / or bottom of the flow channels in the impeller at least one perforated plate is arranged, on the one facing away from the flow channels Side there is a volume of air that can flow. In the current of the turbidity prevails on the The interface to the perforated plate is lowered due to the windage of the flow in the tunnel static pressure, which is an influx of air in the form of bubbles into the flowing turbidity causes. If necessary, the air volume can be placed under increased pressure, in particular if there is an increased air requirement this agitator flotation cell

Applicant:

Investment and patent management company

with limited liability,

Essen, Altendorfer Str. 103

Named as inventor:

Manfred Neven, Rheinhausen (Ndrh.)

»5 required. As a result of the flow of the turbidity, the forming bubbles of the incoming air already detached from the perforated plate in the state of origin; thereby arise from the outset small vesicles. The volume of air that can flow

ao extends to the agitator flotation cell of the invention by a hollow shaft of the stirrer or a casing tube surrounding the shaft of the stirrer to the side of the perforated plate facing away from the flow channels in the impeller

* 5 Top of the flow channels. The connection to the side of the perforated plate facing away from the flow channels on the underside of the flow channels can be made through channels in the blades of the impeller.

In the drawing, as an exemplary embodiment, a flotation cell is shown in a vertical center section shown.

In the flotation cell 1 with the foam discharges 2, a stirrer 3 in the form of a radially flown through, closed impeller is arranged centrally above the base, which is attached to a shaft 4 and is set in rotation by a drive 5. The shaft 4 is surrounded by a tube 6 which opens out below into a hood 7 located above the stirrer 3 and at the upper end of which is located above the turbidity level in the flotation cell 1, air inlet slots 8 are arranged. The pipe 6 and the hood 7 are rigidly connected to the stirrer 3 and form a rotating unit with it. To increase the air pressure in the pipe and hood, 8 blade-shaped pockets 9 and 7 radial ribs 10 are arranged in the hood. Between the hood 7 and the stirrer 3 is a plate 11, the outer circular part of which has air passage openings 12 through the tube 6 and the hood? with air flowing in

709 519/188

Claims (1)

be applied. The stirrer 3 sucks the pulp through a shaft 13 and a pipe 14 centrally from below. To avoid a short circuit in the flow of the pulp between the stirrer discharge 15 and suction opening 16 is carried by the stirrer3 Underside of auxiliary wing 17, which prepares a small part of the sludge flowing through tube 14 Pump out the gap 18. ^ If necessary, the bottom 1? the stirrer 3 as a hollow body with a connection of the Cavity designed through channels in the Schaufehl to the hood 7 and in the bottom 19 of the Stirrer 3 can be arranged another perforated plate. The arranged in the flotation cell 1 perforated and unperforated metal sheets 20 serve to calm the cloudy level. ; ':: Several flotation cells according to the invention can each be combined to form batteries. It is also possible to combine several flotation cells of this type in the form of channels in which the partition walls between the flotation cells are completely or partially missing » Patehtanspküch: Agitator flotation cell with a radial flow, designed as a closed impeller Stirrer, characterized in that on the top and / or bottom of the Flow channels in the impeller (3) at least one perforated plate (11) is arranged on the from the side facing away from the flow channels there is a high-flow ventilation volume. Considered publications: -
^^ 6 ^ 81 ^^ 0 ^^ 1028,504;
French patent specification No. 886 733. 1 sheet of drawings 709 519/188 3.67