RU2255814C2 - Aeration assembly of a flotation machine - Google Patents

Abstract

FIELD: mining; metallurgy; food and other industries; production of devices for materials flotation.

SUBSTANCE: the invention is pertaining to the field of mining, in particular, to production of devices used for materials flotation, that may find application in metallurgical, food and other industries. The aeration assembly contains an aeration pipe for air supply and a mounted on it cone-shaped impeller with its smaller base downwards and a cylinder connected with a smaller cone base. The impeller in addition contains the second stage, that represents a concentric ring with the mounted on it radial vanes interposed in the radial slits of the lower stage upper base made in the form of a dead disk. In the lower third of the cone within the intervane intervals and in the connected with it cylinder there are vertical grooves forming a "corona". The lower stage radial vanes, the aforesaid lateral surface of which represents a truncated conical surface, are mounted perpendicularly to the cone surface. The technical result is improved quality of aeration of the fine pulp, decreased power consumption used for aeration, stabilization of the flotation process.

EFFECT: the invention ensures improved quality of aeration of the fine pulp, decreased power consumption used for aeration, stabilization of the flotation process.

3 dwg

Description

The present invention relates to the mining industry, and in particular to devices for flotation of materials, and can be used in the metallurgical, food and other industries.

Known aeration site / 1 / containing placed inside the blade stator impeller, 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.

Known aeration unit / 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 smaller than the diameter of the inner hole of the upper ring. The outer diameter of the lower ring is made equal to or greater 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 is equipped with a frame remote from the inner edge of the stator blade at least 1/4 of the length of the blade.

The closest analogue is the aeration unit / 3 /, which includes a hollow shaft with nozzles for supplying air and a hollow truncated cone mounted on the shaft with an opening in the lower base and protrusions and slots located evenly on the side surface of the cone at its lower base behind the protrusions, while the height of the slots is not more than 1/3 of the length of the protrusions. The aerator slots are arranged along the generators of the truncated cone and are made not less than 1/6 of the height of the cone. The total area of the slots is at least 30% of the cross-sectional area of the outlet of the nozzle for air supply. The truncated cone at the lower base is made with a cylindrical shell. The protrusions behind which the slots are located are made with different-sized grooves located above the slots.

The disadvantages of the known aerators is the insufficiently uniform distribution of air over the surface of the aerator, which reduces the quality of the dispersed air and the efficiency of flotation.

The objective of the invention is the creation of an aeration unit of the 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.

This object is achieved by the fact that in the known aeration unit of a flotation machine containing an aeration pipe for supplying air and a cone-shaped impeller mounted on it with a smaller base down and a cylinder connected to a smaller base of the cone, the impeller further comprises a second stage, which is a concentric ring mounted on it with radial blades inserted into the radial slots of the upper base of the lower stage, made in the form of a deaf disk, and in the lower third of the cone vertical slots are made in the inter-blade space and the cylinder associated with it, forming a “crown”, while the radial blades of the lower stage, the described lateral surface of which is a truncated conical surface, are installed perpendicular to the surface of the cone.

All of the above improves the bottom circulation of the pulp and the conditions for air exit to the conical surface of the impeller by reducing the resistance to the movement of the pulp stream. The presence of vertical slots made in the lower third of the cone in the inter-blade space and the cylinder associated with it creates the condition for dispersing air as it rises along the lateral surface of the truncated cone with an oncoming pulp stream.

A general view of the aeration unit is shown in Fig. 1, Fig. 1a is a top view, Fig. 1b is a bottom view.

The aeration unit contains an air distribution pipe 1, a two-stage impeller mounted on it. The upper stage of the impeller consists of radial blades 2, mounted on a concentric ring 3. The upper stage is attached by welding of radial blades 2 to the upper disk of the lower stage 4, which are inserted into the slots of the disk. The lower stage of the impeller is a truncated cone-shaped impeller installed with a smaller base down, and the cylinder 5 conjugated with it. The base of the cone of the lower stage 4 is a blind disk into which the blades 2 of the upper stage are inserted. The radial blades of the lower stage 6 are mounted perpendicular to the conical surface 7, in which the cylinder 5 and its associated cylinder have radial vertical slots 8 through which air is supplied. A blank disk 9 is installed in the lower part of the impeller. In the axial section, the elements of the impeller have a symmetrical shape. The impeller is lowered into the stator 10, which is a disk mounted coaxially to the impeller on the bottom of the flotation machine, to which are mounted radial ribs mounted at a right angle to the surface of the disk.

The device operates as follows.

During operation of the aeration unit for rotation of the impeller in the annulus, a region of reduced pressure is created. As a result, the pulp rushes into the impeller through the inter-ring space between the shaft 1 and the inner edge of the ring 3 of the upper stage. The air flow is supplied through the air distribution pipe 1, reflected from the blank disk 9 located in the lower part of the impeller, and is ejected into the slots 8 of the cone and the cylinder associated with it. The air is dispersed by the blades 6 of the lower stage, mixing with the oncoming pulp stream ejected by the upper stage of the impeller, and then in the interlobed space of the stator 10. Air bubbles trap particles of the useful product and raise them to the surface, forming a foam enriched with this product.

The present invention improves the quality of aeration of the pulp, reduce energy consumption for aeration and stabilizes the flotation process.

Sources of information

1. RF patent No. 2095153, B 03 D 1/14, 1997

2. RF patent No. 2158187, B 03 D 1/14, 2000

3. RF patent No. 2158186, 03 D 1/14, 2000 g (prototype).

Claims (1)

The aeration unit of the flotation machine, containing an aeration tube for air supply and a cone-shaped impeller mounted on it with a smaller base down and a cylinder connected with a smaller base of the cone, characterized in that the impeller further comprises a second stage, which is a concentric ring with radial blades mounted on it, which are inserted into the radial slots of the base of the lower stage, made in the form of a deaf disk, and in the lower third of the cone in the inter-blade space and mating The female cylinder with it has vertical slots forming a “crown”, and the radial blades of the lower stage, the described lateral surface of which is a truncated conical surface, are mounted perpendicular to the surface of the cone.