RU2225263C2 - Aeration assembly of a flotation machine - Google Patents

Abstract

FIELD: mineral products dressing by a flotation methods. SUBSTANCE: the invention presents an aeration assembly of a floatation machine, that may be used for mineral products dressing by a flotation methods in metallurgical, mining, chemical and other industries. Technical result - increase of a degree of a dispersion of air babbles and their more even distribution in volume of the flotation pulp. The aeration assembly contains the hollow shaft for an air supply and mounted on it a cone-shaped impeller with its smaller base downwards and with slots - in radial stiffening ribs. The side surface of the stiffening ribs is in the form of a truncated cone. The greater base represents a ring, on inner side of which there are the radially placed vanes having height of 1/3 of heights of an impeller in a zone of the openings formed between two contiguous ribs. The lower base has the form of a blank disc with radial channels in the disc body. The radial channels have a radial transition in the slots of the radial stiffening ribs. EFFECT: the invention allows to increase a degree of dispersion of air babbles and their more even distribution in the volume of the flotation pulp. 2 dwg

Description

The invention relates to mineral processing by flotation, in particular to aeration devices, and can be used in metallurgical, mining, chemical and other industries.

Known aerator / 1 / containing mounted on a shaft and consisting of a disk in the form of a truncated cone facing upwards with a smaller base and blades mounted on the bottom side of the disk from trapezoidal plates with a gap, a sub-aerator disk with a circulation hole, a stator located around the aerator on a sub-aerator disk . The cavity of the shaft is communicated with the cavities of the blades formed by the trapezoidal plates.

Known aerator / 2 / containing mounted on a shaft and consisting of a disk in the form of a truncated cone facing upward with a smaller base and blades mounted on the bottom side of the disk from trapezoidal plates with a gap, a sub-aerator disk with a circulation hole, a stator located around the aerator on a sub-aerator disk , in the aerator disk above the inter-blade space, holes are made for the intracameral circulation of the pulp, and the ratio of the depth of immersion of the aerator to its height is from 3.0 to 3.5.

A device for aeration of flotation pulp / 3 /, including an air distribution pipe with holes and an impeller mounted on it, consisting of radial blades mounted between the upper and lower disks with holes located around the circumference, the holes of the air distribution pipe are placed in the interdisk space, the air distribution pipe is installed relative to the lower disk with the formation of an annular gap, while the holes of the air distribution pipe are made adjacent to the surface the top disc and the inner edges of apertures in the disks are arranged on circles, the diameters of which are equal to the outer diameter of the air discharge pipe.

The closest analogue is the aeration unit / 4 /, containing an impeller located inside the blade stator, made in the form of a truncated hollow cone with protrusions on the side surface. The cone is facing down with a smaller base. The impeller is connected to the hollow shaft for air supply and contains in the upper part a disk with radial blades. On the bottom of the chamber under the impeller, a plate is installed coaxially with it, the side surface of which is made with protrusions.

A disadvantage of the known aeration units is the low flotation efficiency.

The objective of the invention is the creation of an aeration unit of a flotation machine, which allows to increase the efficiency of the flotation process, by increasing the degree of dispersion of air bubbles and their more uniform distribution in the volume of flotation pulp.

The problem is solved in that in the known aeration unit of a flotation machine containing an impeller, made in the form of a truncated cone, facing down with a smaller base and connected to the hollow shaft for air supply, radial blades mounted on the upper base of the impeller, the lower and upper bases are interconnected the radial stiffeners installed in the area of the windows between the radial blades, the described lateral surface of the stiffeners has the shape of a truncated cone, the smaller base of which nent a hollow lower base disk impeller in the body of the disc provided with radial channels having a radial transition in slots which are made in the radial stiffeners.

A general view of the aeration unit is shown in FIG. 1; in Fig 2 - section a - a, top view.

The aeration unit contains a hollow shaft for supplying air 1 and an impeller mounted in it in the form of a truncated cone, located smaller base down. The smaller base is a blank disk 2, attached to a hollow shaft. On the outer surface of the disk there are protrusions 4 for crushing air, and channels 5 for diverging compressed air supplied from the hollow shaft 1 diverge in the body. Between the lower and upper bases there are stiffeners 6 with slots 7 radially emanating from the channels of the blank disk. The described lateral surface of the radial stiffeners has the shape of a truncated cone, the smaller base of which is the impeller impeller. The channels 5 of the blank disk 2 have a transition in the slot 7 of the radial stiffeners 6 and serve simultaneously as the impeller blades. In a horizontal section, the channels in the stiffeners are U-shaped. The upper base of the cone is a ring 8. On the inner surface of the ring along its periphery there are radial blades 9, the circumference of which is diametrically larger than the outer diameter of the ring.

Aeration unit operates as follows.

When the impeller rotates in the annulus, a region of reduced pressure is created. As a result, the pulp rushes into the impeller through the cavity between the upper concentric ring 8 and the hollow shaft 1. Then the pulp is thrown out through the windows of the intercostal space. At the same time, air is supplied through the hollow shaft under pressure, which, passing through the channels 5 of the blank disk 2, enters the slots 7 of the ribs 6, uniformly distributed over the height of the impeller, and is crushed by the blades 9.

The presence of channels 5, passing into the slots 7, and blades 9 creates a mixture and crushing of air and aeration of the pulp along the entire height of the impeller and covers nearby areas. Bubbles of air capture particles of a useful product and raise them to the surface, forming a foam enriched with this product. In axial section, the impeller elements have a symmetrical shape. Therefore, during operation of the aeration unit, the impeller can rotate in any direction.

The proposed aeration unit of the flotation machine allows to increase the efficiency of the flotation process, to increase the degree of dispersion of air bubbles and their more uniform distribution in the volume of flotation pulp.

Sources of information

1. USSR copyright certificate No. 1596782, B 03 D 1/14, 1990

2. RF patent No. 2061554, B 03 D 1/14, 1996

3. Copyright certificate No. 1554974, B 03 D 1/14, 1990

4. RF patent No. 2095153, B 03 D 1/14, 1997 (prototype).

Claims (1)

Aeration unit of a flotation machine containing an impeller made in the form of a truncated cone facing down with a smaller base and connected to a hollow shaft for air supply, radial vanes mounted on the upper base of the impeller, characterized in that the lower and upper bases are interconnected by radial stiffeners installed in the area of the windows between the radial blades, the described lateral surface of the stiffeners has the shape of a truncated cone, the smaller base of which is a blind disk n bottom of the impeller, in the body of the disk are made radial channels having a radial transition in the slots, which are made in radial stiffeners.

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