RU23581U1 - AERATION UNIT OF FLOTATION MACHINE - Google Patents

Description

AERATION UNIT OF FLOTATION MACHINE

The proposed utility model is related to mineral processing, flotation, in particular to aeration devices, and can be used in metallurgical, mining, chemical and other industries.

Known aeration unit / 1 / containing a shaft, an axial impeller with blades, a cylinder with holes in its upper cover and side with stator blades in its lower part. The impeller is made with blades, the convex working surfaces of which are in cross section part of the branch of the curve of the 2nd order. The blades are made expanding 1.2-1.5 times from the periphery to the axis of the shaft and are inclined to the bottom of the chamber. The ends of the impeller blades are placed at a distance of 0.5-1.0 of its diameter from the bottom of the chamber. A cylinder with holes for pulp circulation has a height of 1 / 2-1 / 3 of the depth of the chamber with a live total section of the holes in it of 0.08-0.15% of the chamber area. Stator blades are inclined to the bottom of the chamber at an angle of 25-45 ° to the vertical and at an angle of 40-55 ° to the radius of the cylinder in the direction of rotation of the impeller.

Known aeration site / 2 / containing an impeller located inside the blade stator, made in the form of a truncated cone connected to the hollow shaft with protrusions on the side surface facing down with a smaller base and containing a disk located above the cone with a central hole and radial blades. The stator is equipped with upper and lower rings and is installed in the chamber with a gap between the lower ring and the bottom of the chamber. The inner hole of the lower ring is made with a diameter less than the diameter of the inner hole of the upper ring. The outer diameter of the lower ring is made equal to or larger than the outer diameter of the upper ring. The disk and radial blades are completely made of elastomeric material with a hardness above 30 SHOR. The stator is made of elastomeric material and

lull ,, „,. J iL. ,, .., ™ .., ..., ...,. ..-. f- -, - B03D1 / 14 is equipped with a frame remote from the inner edge of the stator blade by at least 1/4

from the length of the pubis.

Known aeration unit / 3 /, containing inside the blade stator an impeller made in the form of a truncated cone with protrusions on the side surface facing down with a smaller base and connected to the hollow shaft for air supply, the impeller in the upper part contains a disk with a central hole and 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, the diameter of the side surface of the plate is made smaller to the upper base of the plate, while the diameter of The total base of the slab is 1.0-1.2 times the diameter of the lower base of the impeller.

The closest analogue is the aeration unit / 4 / of the Denver-M flotation machine (USA), which contains two impellers mounted on the shaft. The lower impeller has a large diameter and is located at a depth of 800 mm, and the second at a depth of 1200 mm from the top of the chamber. The aeration of the pulp is provided by suction of air from the atmosphere or from the blower through a central pipe into the zone of the upper impeller. The pulp-air mixture emitted by the centrifugal impeller is partially carried away by the axial impeller downward, thereby mixing and aeration of the pulp is provided in the lower part of the flotation chamber. The impeller unit of the machine is attached to the support frame with four bolts.

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

The objective of the proposed utility model is to create an aeration unit of the flotation machine, which allows to increase the efficiency of the flotation process.

The problem is solved in that in the known aeration unit containing a shaft on which two radial impellers are mounted, it additionally contains two more impellers installed in the stators, and a dispersant, one of the impellers being

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2

located between the lower and upper radial impellers, and the second and disperser above the upper radial impeller, a bottom plate is installed on the bottom of the machine with a clearance for pulp suction to the shaft; , representing two half rings connected to each other in which the lower radial impeller is partially or fully installed.

The impeller, located between the lower and upper radial impellers, is made in the form of a molded rubberized structure, which is a hub turning into a deaf cup-shaped disk, convex to the bottom of the flotation machine, and the stator is mounted on racks mounted on the bottom plate.

The upper impeller is made stackable in height, the total contour of each blade in the radial plane made in the form of a hexagon made up of a trapezoid and a rectangle adjacent to its larger base.

On the rubberized working surface of the blades of the radial impellers, rubber guides are additionally attached, having a sectional shape of a trapezoid.

The dispersant is made in the form of 4 segments connected in a ring and 4 sectors of half shells welded to them, the surface of which is maximally perforated in a checkerboard pattern.

A larger number of impellers and dispersant contributes to the maximum dispersion of air bubbles, which can significantly increase the efficiency of flotation.

A general view of the aeration unit is shown in FIG. 1

The aeration unit comprises a shaft 1, an air support tube 2 located around the shaft. The aeration unit contains four levels of dispersion of air in the pulp.

A stator 3 is mounted on the supporting air pipe 2. The stator is made of 2 rings, each of which is assembled of 2 half rings, between them stiffening ribs, which are rectangular plates, are radially fixed. The outer surface of the stator is two half-shells fastened together by means of a bolted connection. The surface of the half shells has through holes distributed between each two adjacent stator stiffeners in a strict order: two vertical rows of 5 holes. Inside the stator 3, a height-adjustable impeller 4 is introduced, consisting of 3 parts. The impeller is lowered into the stator at 2/3 of its height. It consists of a hub and radial blades. The total contour of each blade in the radial plane is made in the form of a hexagon made up of a trapezoid and a rectangle adjacent to its larger base, and the length of the smaller base of the trapezoid is equal to the total height of the hub. Rubber guides are attached to the working surface of rubberized blades. Moreover, one side of the scapula has vertical guides, and the opposite side is ray-shaped, converging to the outer edge of the scapula. In the section, the guides have the shape of a trapezoid.

The next stage of dispersion of air in the pulp is dispersant 5, it consists of 4 segments connected to a ring using a bolt connection and 4 shell sectors welded to them, also fastened to each other by a bolted connection. The surface of the shell sectors is maximally perforated in a checkerboard pattern.

In the middle part of the shaft 1, a radial impeller 6 is installed, which is a hub and radial blades mounted on it. Rubber guides are attached to the working surface of rubberized blades. 1 guides are vertical on one side and horizontal on the back. In the section, the guides have the shape of a trapezoid.

On the bottom of the flotation machine, a bottom plate 7 is mounted coaxially with the shaft 1, which is a disk with a central hole. Between the bottom of the machine and the bottom (5 // 3 / Ной the plate there is a gap for the suction of pulp. Around the perimeter of the central hole

a guide for the flow of pulp is welded to the bottom plate 8. An extension cord 9 is mounted on it, which is two half rings that are connected to each other and to the guide by the clamp method. An extension cord serves as a regulator of pulp flow. A radial impeller 10 is omitted inside them, and the diameter of the central hole of the bottom plate is slightly larger than the diameter of the circumscribed circle of the lower radial impeller. Depending on the height of the extension, the impeller is partially or completely submerged. The impeller is a hub with radial blades. Rubber guides are attached to the working surface of rubberized blades. One side of the blade has a horizontal guide. The reverse is vertical. In the section, the guides have the shape of a trapezoid.

Above the bottom plate above the extension 9 is a stator 11 mounted coaxially to the shaft on the uprights 12 mounted on the bottom plate 7. The stator is 2 rings, between which radial blades are attached. An impeller 13 is installed inside the stator. The impeller is a molded rubberized construction in the form of a hub turning into a deaf cup-shaped disk facing the convex part of the flotation machine. On the concave part of the disk there are radial blades, the length of which is 1/2 of the radius of the disk, counting from the outer edge of the disk. A tide is radially located between the scapula and the hub, which serves both to disperse the pulp and as a stiffener.

Aeration unit works as follows:

The pulp fills the working chamber of the flotation machine. During operation of the aeration unit, as a result of rotation in the inter-blade space of the lower radial impeller 10, a region of reduced pressure is formed, as a result of which the pulp rushes through the central hole of the bottom plate 7 into the region of the annulus between the impeller 10 and the flow guide of the pulp 8. Rubber direction 2X)

5

The constituents located on the working surfaces of the impeller blades 10 increase their working surface and serve as guides of the pulp upward flow. Depending on the composition of the pulp, its hydraulic properties change. To regulate the flow rising from the Central hole of the bottom plate 7 during the rotation of the impeller 10, there is an extension 9. Further, passing between the blades of the impeller 10, the pulp is deflected by the impeller of the impeller 13 in the horizontal direction. When the impeller 4 rotates in the annulus of the stator 3, a region of reduced pressure is formed, and a region of increased pressure is formed at the walls of the stator. The pulp from the middle layers raised by the impeller 10 rushes into the inter-annulus between the impeller 4 and the stator 3. Air is drawn in by the upper edges of the impeller 4 blades from the atmosphere through the support tube 2. The rotor-stator-dispersant system prevents the pulp from moving in the chamber in a circular fashion. In the wide-band impeller 4, such a profile of the blades is selected in which channels are formed near the hub, between adjacent blades. The presence of channels reduces the hydraulic resistance of the flow, which contributes to an increase in the supply of the impeller through the pulp and air. A deeper penetration of the pulp and air into the space between the shoulder blades reduces the volume of the passive zone. Also, the hydraulic resistance of the pulp and air flow is reduced, thereby reducing the turbulence of the resulting flows, which leads to a decrease in the power spent on the rotation of the impeller. With the blades of impeller 4, the pulp-air mixture is scattered on the ribs of the stator 3, while the air is additionally dispersed. Pulp-air mixture, due to excess pressure at the walls, seeps in separate streams through the stator holes, and then the air is additionally dispersed when the pulp-air mixture leaks through the perforated walls of the dispersant.

Rubber guides located on the working surfaces of the impeller blades 4 increase their working surface and serve as guides for the flow of pulp and

air. In the pulp-air mixture obtained during the operation of the impeller 4, the air is dispersed and capturing particles of useful products is concentrated in the form of foam on the liquid-air interface and is removed by foam foams. Air also penetrates into the lower layers of the pulp, where, under the influence of impellers 6 and 13, the dispersion process continues in the lower levels of the pulp.

Impeller 6 conducts mechanical dispersion of air bubbles, increasing rubber guides of the working surfaces of the impeller blades, enhancing the vertical circulation of the pulp. Rubber guides increase the working surface of the blades and serve to direct the flow of pulp.

Impeller 13 serves the most complete dispersion of air bubbles located in the lower layer of the pulp column. The pulp-air mixture captured by the impeller 13 into the gap between the impeller 6 and 13 penetrates the working surface of the blades and is discarded on the radial ribs of the stator 11.

The proposed design allows to achieve better dispersion of air and the greatest rotational circulation of the pulp, provides high technological performance at high productivity in the flow of pulp.

Sources of information taken into account:

1. RF patent No. 2174050, B03D1 / 14, 2001.

2. RF patent No. 2158187, B03D1 / 14.2000.

3. RF patent No. 2095153, B03D1 / 14.1997.

4.Meshcheryakov N.F. Flotation machines M., because of "Nedra 1972 pp. 62-63 General. OJSC “nof | §l% Author: V T t-i- t.-l Gladyshev A.M. Gladyshev A.M.

Claims (5)

1. Aeration unit of the flotation machine, containing a shaft on which two radial impellers are mounted, characterized in that it further comprises two more impellers installed in the stators and a dispersant, one of the impellers being located between the lower and upper radial impellers, and the second and dispersant - above the upper radial impeller, a bottom plate is installed on the bottom of the machine with a clearance for pulp suction coaxially to the shaft, made in the form of a disk with a central hole larger than the diameter of the circumference of the lower impel lera, containing the guide flow of the pulp and the extension cord, which is two half rings connected to each other, in which the lower radial impeller is partially or fully installed.  2. The aeration unit according to claim 1, characterized in that the impeller, located between the lower and upper radial impellers, is made in the form of a molded rubberized structure, which is a hub turning into a deaf cup-shaped disk facing the convex part to the bottom of the flotation machine, and the stator mounted on racks mounted on the bottom plate.  3. The aeration unit according to claim 1, characterized in that the upper impeller is stacked in height, the total contour of each blade in the radial plane made in the form of a hexagon made up of a trapezoid and a rectangle adjacent to its larger base.  4. Aeration unit according to claims 1 and 3, characterized in that on the working surface of the blades of the radial impellers additionally attached rubber guides having a sectional shape of a trapezoid. 5. The aeration unit according to claim 1, characterized in that the dispersant is made in the form of four segments connected in a ring and four sectors of half shells welded to them, the surface of which is maximally perforated in a checkerboard pattern.