SU1245346A1 - Aerator for flotation machine - Google Patents

Description

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The invention relates to devices for aerating a liquid and can be used in the flotation of minerals, in the treatment of wastewater and industrial water, in ionic flotation, as well as in the formation of liquids with oxygen.

The purpose of the invention is to increase the ejection, dispersing and mixing capacity of the aerator.

Figure 1 shows the schematic diagram of the blade, the plan; figure 2 - blade, cross section.

The device consists of a shaft 1 with radial blades 2 with wedge-shaped 15 projections 3, and may also contain overlapping plates 4.

The protrusions 3 are located on the back side of each blade 2 with gaps relative to each other and are made wedge-shaped in the plane of the front side of the form with the vertices facing the side of the aerator rotation and

At the stub blades of the blades, the streams emerging from the surface of the blade are arranged and the area of active mixing in the chamber volume increases, while behind the back side of the blade the cavities are formed into which cavities are sucked in by any known means of air. The indicated angles of OS and US of the sides of the protrusion take into account the presence of the component velocities and make it possible to achieve the location of the flow channels by the protrusions taking into account the resultant of these velocities.

Both behind the back edge of the blade and behind the protrusions, air cavities are also formed, while at the same time the flow from the blade is broken due to the ribbing of the surface of the stream due to the presence of 20-Protrusions more active-. ejection of air by the flow, both due to the increase in the contact area of the liquid with the cavity air, and due to

,,. specifics of hydrodynamics of these flows.

sesnovaniya mi located at -

   o .. At the same time in the gaps between

protrusions, the pulp velocity increases and gas evolution occurs. Thus, in comparison with the known aerator, the proposed allows

break edge. Each blade 2 is set at an angle LL to the horizontal plane. With a similar implementation of the projections 3 between them.

gaps 5 with a narrowing in the direction of a shear

/ „„ 30 significantly increase the coefficient of the edge, at the same time the angle C is formed. H-h -,

      ejection.

radial plane and plane

the protrusion on the shaft side is larger than the angle and formed by the same radial plane and the plane on the side of the blade face, the plane of each wedge.

The preferred location of the peaks of the projections 3 is on one straight line. Protrusions, 3 and 5 gaps

can be blocked plate 4, and from the shaft 1 to the end of the blade 2 is made a groove 6 on the back side of the blade 2.

The device works as follows. . .

When the shaft rotates at a given circumferential speed, the pulp flow runs onto the blades 2 due to their location at an acute angle to the horizontal, y plane. With conventional blades in a known design, the flows on the surface of the blades are highly turbulized due to the strong influence of the radial velocity component, which leads to intensive mixing of the pulp directly at the aerator and impedes the penetration of high-speed flows over the entire cross section of the chamber. In the proposed design due to the presence of

At the stub blades of the blades, the streams emerging from the surface of the blade are arranged and the area of active mixing in the chamber volume increases, while behind the back side of the blade the cavities are formed into which cavities are sucked in by any known means of air. The indicated angles of OS and US of the sides of the protrusion take into account the presence of the component velocities and make it possible to achieve the location of the flow channels by the protrusions taking into account the resultant of these velocities.

Both behind the back edge of the blade and behind the protrusions, air cavities are also formed, while at the same time the flows from the blade due to the ribbing of the flow surface due to the presence of Protrusions are more active on the ejection of air by the flow fluid contact with the air cavity, and by virtue

In addition, in the proposed device, the total cavitation cavity behind the blade increases in length due to the ordering of the 2 streams dislodged from the blade, which allows efficient air dispersion at a greater distance from the aerator. This increases the mixing capacity of the aerator, and also allows for the formation of bubbles of smaller size compared with the known device.

If the protrusions -3 and the gaps 5 are blocked by the plates 4, the ejecting and dispersing cnoQo 6HocTH aerator is further increased due to the fact that the free-flow aeration effect is realized with such a design. This is due to the fact that behind the blade, protrusions and plate one common air cavity is formed, into which

high-speed jets of channels between the protrusions, the surface of the blade and the plate expire. These jets eject the air as their surface gas-liquid air cavity, while the jets contribute to the effective dispersion of air and rejecting the air-saturated pulp from the aerator.

To stop the air supply

behind the blade 2 is the groove 6 on the back

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1245346-.

to the side of the blade 2. The groove 6 may communicate with holes in the aerator shaft through which air is supplied from the shaft, while it is desirable to close the groove in the immediate vicinity of the shaft to eliminate air breakthroughs in the form of large undispersed bubbles.

Editor L.Gratillo

Compiled by E. Tarasova

Tehred O. Sopke Proofreader M. Demchik

Order 3940 / 4Discount 514Subscription

VNIIPI USSR State Committee

for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5

Production and printing company, Uzhgorod, st. Project, 4

2

Claims (5)

1. AERATOR OF A FLOTATION MACHINE, comprising a shaft with radial blades, each of which is installed at an angle to the horizontal plane, characterized in that, in order to increase the ejecting, dispersing and mixing ability of the aerator, wedge-shaped protrusions with gaps relative to each other, with peaks facing the rotation of the aerator, and with bases located at the level of the stall edge. 2. The aerator according to claim 1, with the fact that the angle formed by the radial plane and the protrusion plane from the shaft side is greater than the angle formed by the radial plane and the protrusion plane from the side of the blade end, 3. The aerator according to claim 1, characterized in that the vertices of the protrusions are located on the same straight line. 4. The aerator according to claim 1, characterized in that the protrusions and the gaps between them are blocked by a plate. 5. The aerator according to claim 1, characterized in that a groove is made on the back of the blade from the shaft to the end of the blade. Figure 1 lv ns 1 12.45346