RU63709U1 - DEVICE FOR GRINDING METAL CONTAINING RAW MATERIALS - Google Patents

Abstract

Usage: refers to the field of ferrous metallurgy and can be used in the processing of metallurgical waste for the extraction of iron-containing inclusions (scrap) from metallurgical slag and the beneficiation of ores and precious metals. Objective: to improve the device for grinding metal-containing raw materials, by changing the design of the elements of the device to exclude the process of self-compaction of the crushed material. SUBSTANCE: device for grinding metal-containing raw materials, mainly for metal-containing raw materials, contains a grinding chamber with a pneumatic separation system, consisting of a vertical cylindrical body with a loading hole for metal-containing raw materials and discharge channels for crushed products of light and heavy fractions, inside of which a rotating disk is placed on a vertical shaft with blades radially mounted on its upper surface with carbide elements and a conical divider. The rotating disk is equipped with blades placed on the lower surface of the rotating disk, on the upper surface of the rotating disk, an annular protrusion is made on its periphery, into which the blades abut, while the inner surface of the annular protrusion in the sections between the vanes is mated with the surface of the rotating disk on an inclined plane, the system pneumoseparation contains, interconnected, a cone-shaped container with an upper and lower outlet branch pipe for a ground product of a light fraction and a vertical tube thawed tank, the last of which is connected with the discharge channel for the crushed light fraction product made in the peripheral part of the upper end wall of the grinding chamber body, and a pressure chamber formed in the gap between the rotating disk and the lower end wall of the housing of the grinding chamber with an opening in communication with atmosphere, rectangular blades

prisms have a bevel at the base from the side of its free end, while the length of the blades and the diameter of the base of the cone divider are respectively taken no more than 0.25 and 0.5 of the diameter of the rotating disk, the angle of inclination of the generatrix of the cone divider is taken at least 45 degrees, and the discharge channel under the crushed product of the heavy fraction is made in the peripheral part of the lower end wall of the pressure chamber housing. Effect: increase the reliability and durability of the device. 1 n.p. f-ly, 1 z.p. f-ly, 3 ill.

Description

The utility model relates to the field of ferrous metallurgy and can be used in the processing of metallurgical waste for the extraction of iron inclusions (scrap) from metallurgical slag and the beneficiation of ores and precious metals.

Known rotor shock - centrifugal crusher according to the patent of Russia No. 2188075 MKI 7 B 02 C 7/08, publ. 08/27/2002, containing a grinding chamber consisting of a vertical cylindrical body with an axial inlet for metal-containing raw materials and output channels for the crushed product, inside of which a rotating disk with blades radially mounted on its upper surface with carbide elements is placed on a vertical shaft.

Also known centrifugal impact mill according to the patent of Russia №2002120520, MKI B 02 C 13/18, publ. 01/20/2004, containing a grinding chamber consisting of a vertical cylindrical body with an axial loading hole for metal-containing raw materials and discharge channels for ground products of light and heavy fractions, inside of which on a vertical shaft there is a rotating disk with carbide blades radially mounted on its upper surface with carbide blades elements and divider.

The closest analogue, in terms of the set of features and the expected technical result to the claimed utility model, is a double-feed centrifugal crusher Titan D (see attached to the materials of the application “New Technologies” www.new-tehnologies.ru, 2004), containing a grinding chamber with pneumatic separation system consisting of a vertical cylindrical body with a loading axial hole for metal-containing raw materials and discharge channels for crushed

products of light and heavy fractions, inside of which on a vertical shaft there is a rotating disk with blades with carbide elements radially mounted on its upper surface and a cone divider.

A common drawback of the above devices is their low reliability, which is due to the fact that when a metal-containing piece gets in, the size of which exceeds the gap between the chamber wall and the rotating rotor, there is a possibility of jamming, possible breakdowns. When the feedstock moisture is more than 4%, the self-lining sections of the rotor and the working chamber will be cemented by the products of the crushed raw materials until the effect of self-jamming and imbalance of the rotor.

The basis of the invention is the task to improve the device for grinding metal-containing raw materials, by changing the design of the elements of the device to exclude the process of self-sealing of the crushed material and thereby increase the reliability and durability of the device.

The problem is solved in that a device for grinding metal-containing raw materials, containing a grinding chamber with a pneumatic separation system, consisting of a vertical cylindrical body with an axial loading hole for metal-containing raw materials and discharge channels for ground products of light and heavy fractions, inside of which a rotating disk with blades radially mounted on its upper surface with carbide elements and a cone divider, according to a utility model, rotate the disk is provided with blades located on the lower surface of the rotating disk, on the upper surface of the rotating disk, an annular protrusion is made on its periphery, into which the blades abut, while the inner surface of the annular protrusion in the sections between the vanes is mated with the surface of the rotating disk on an inclined plane, the system pneumoseparation contains, interconnected conical capacity

with upper and lower outlet pipes for the crushed light fraction product and a vertical tubular capacity, the last of which is connected to the discharge channel for the crushed light fraction product, made in the peripheral part of the upper end wall of the grinding chamber body, and an increased pressure chamber formed between the rotating the disk and the lower end wall of the housing of said grinding chamber with a hole in communication with the atmosphere, blades made in the shape of a rectangular prism have the bevel on the side of its free end, while the length of the blades and the diameter of the base of the cone divider are respectively taken no more than 0.25 and 0.5 times the diameter of the rotating disk, the angle of inclination of the generatrix of the cone divider is taken at least 45 degrees, and the discharge channel for the crushed product is heavy fractions are made in the peripheral part of the lower end wall of the grinding chamber body.

The annular protrusion of the rotating disk is made at a height not less than the height of the blades.

The boundary parameters of the length of the blades are established experimentally taking into account the active zone of destruction of the feedstock. With an increase in the length of the blades more than 0.25 of the diameter of the rotor, the productivity of the device remains the same, and the weight of the rotating disk increases.

When the diameter of the base of the cone divider is taken no more than 0.5 of the diameter of the rotating disk, the optimum working clearance between the inner surface of the grinding chamber body and the blades is ensured.

When the angle of inclination of the generatrix of the divider is not less than 45 degrees, the most effective circulation movement of the crushed metal-containing raw materials in the grinding chamber is ensured, in which no sticking and self-sealing of the crushed raw materials on the working bodies are observed.

The execution on the periphery of the rotating disk of the annular protrusion, in which the blades abut, the inner surface of which in the sections between the blades is mated with the surface of the rotating disk on an inclined

the plane ensures, during the grinding of the feedstock, the return of unconditioned feedstock to the grinding chamber, by cyclically impacting the crushed feedstock, in which the unconditioned feedstock of a large fraction as well as a fine dust fraction is beaten off by an inclined plane and an annular protrusion onto the surface of the cone divider, by which the crushed feed is supplied to the active zone of the grinding chamber and is separated during grinding. This provides an optimal mode of cyclic grinding of the feedstock and its separation.

The execution of the blades on the same level with the annular protrusion provides the optimal grinding mode of the feedstock in which sticking and self-compaction of the crushed raw materials on the working bodies of the grinding chamber are not observed.

The invention is illustrated by drawings, where:

figure 1 - presents a General view of the device for grinding metal-containing raw materials;

figure 2 - device for grinding metal-containing raw materials in cross section (type A);

figure 3 - plot of the rotating disk of the device for grinding metal-containing raw materials (top view).

A device for grinding metal-containing raw materials contains a grinding chamber 1 with a pneumatic separation system consisting of a vertical cylindrical body 2 with a loading axial hole 3 for metal-containing raw materials and discharge channels for crushed products of light 4 and heavy 5 fractions. Inside the grinding chamber 1 on a vertical shaft 6 there is a rotating disk 7 with blades 8 with carbide elements 9 radially mounted on its upper surface and a taper divider 10. The rotating disk 7 is equipped with blades 11 located on the lower surface of the rotating disk 7. On the upper surface of the rotating disk 7, on its periphery is made

an annular protrusion 12, in which the blades 8 abut. The inner surface of the annular protrusion 12 in the sections between the blades 8 is conjugated with the surface of the rotating disk 7 along an inclined plane 13. The pneumatic separation system contains, interconnected, a cone-shaped container 14 with the upper 15 and lower 16 outlet pipes under the crushed light product and the vertical tubular tank 17. The tubular tank 17 is in communication with the discharge channel 4 under the crushed light product, made in the peripheral part of the upper end howl wall 18 of the housing 2 of the grinding chamber pneumoseparation 1. The system also comprises a pressure chamber 19 formed in the gap between the rotating disk 7, and the lower end wall 20 of the housing 2 of said grinding chamber 1 with an opening 21 communicating with the atmosphere. The blades 8, made in the shape of a rectangular prism, have a bevel 22 at the base from the side of its free end. The length of the blades 8 is taken no more than 0.25 of the diameter of the rotating disk 7. The diameter of the base of the cone divider is taken no more than 0.5 of the diameter of the rotating disk. The angle of inclination of the generatrix of the conical divider 10 is taken at least 45 degrees. Channel 5 under the crushed product of the heavy fraction is made in the peripheral part of the lower end wall 20 of the housing 2 of the grinding chamber 1. The annular protrusion 12 is made at a height not less than the height of the blades 8. To rotate the disk 7, use an electric drive 23.

A device for grinding metal-containing raw materials is as follows.

Previously, a device for grinding metal-containing raw materials is brought into working condition. For this, the drive 23 of the rotating disk 12 is turned on. After that, the metal-containing raw material is fed into the grinding chamber 1 in a uniform flow through the loading axial hole 3.

Under the influence of centrifugal force, the metal-containing raw materials are discarded to the peripheral section of the rotating disk 7, i.e. rotor

where the plane of movement of the crushed material varies from horizontal to inclined in the range from 40 to 50 degrees. In this case, the flight path of the ground product will be directed to the upper part of the grinding chamber 1, which eliminates the process of self-compaction of the ground material on its inner surface. The crushed raw material, having reached the upper end wall 18 of the housing 2 of the grinding chamber 1, is returned under the action of gravity and elastic properties to the working area of the grinding chamber 1, by rolling on the surface of a cone-shaped divider 10, onto the blades 8 of the rotating disk 7, colliding with other particles chopped raw materials. Particles of crushed raw materials in the grinding chamber 1 perform both translational motion on the torus surface and their own rotation around the axis of inertia of this particle. Such a complex movement of particles of ground material in the grinding chamber 1 ensures the destruction of these particles to give them a shape in the form of a sphere. In particular, metallic inclusions that are present in the feedstock take on this form.

Having crushed to a dusty so-called light fraction, the product, having passed the shock load section, reaches the discharge channel 4 under the crushed light fraction product and flies out under the influence of air flow pressure into the tubular tank 17 and then into the conical tank 14 of the pneumatic separation system. The air flow, in the pressure chamber 19 under pressure of which the light pulverulent fraction of the crushed product enters through the discharge channel 4 in the tank 17, pneumatic separation is formed by the rotation of the blades 11 mounted on the lower surface of the rotating disk 7. In this case, atmospheric air through the hole 21 in the end wall 20 it is sucked in and fed into the annular gap formed between the body of the grinding chamber 1 and the rotating disk 7. Since the said annular gap is constantly in communication with the pressure chamber , The pieces of material to be ground are large in size, under the effect of the pressure chamber 19 and the rotating disk 7 with the blades 8, and

the inclined plane 13 also returns back to the active zone of the grinding chamber 1. Thus, the probability of jamming of the rotating disk and possible breakdowns is excluded.

In view of the fact that the crushed raw materials consist of both strong and weak minerals, under the influence of shock loads they will break down into particles that are very small (weak) and large (strong). As a result, in the pneumatic separation system, these particles will be divided into two streams, strong ones that will be discharged through the lower outlet pipe 16 and small ones that will be carried out by the air flow into the upper outlet pipe 15.

The length of the blades taken is not more than 0.25 of the diameter of the rotating rotor 7 taken on the basis of the active zone for the destruction of the feedstock under the action of shock loads. In this case, an increase in the length of the blades, more than 0.25 of the diameter of the rotating disk 7 does not provide an increase in productivity of the crusher, but increases the weight of the rotating disk, which creates an additional load on the engine of the rotating disk 7.

The diameter of the base of the cone divider is taken no more than 0.5 of the diameter of the rotating disk based on the fact that the formed area does not overlap the working area of the moving blades 8.

The angle of inclination of the generatrix of the cone divider 14 is taken at least 45 degrees, ensuring the rolling of unresolved particles along the generatrix of the cone divider into the working part of the grinding chamber 1.

The inventive device for grinding metal-containing raw materials provides the optimal mode of multiple cyclic grinding of the feedstock with simultaneous separation, which produces a crushed product in the form of a large fraction of concentrate containing up to 80% iron at the outlet of the discharge channel 5. At the outlet of the discharge channel 4, a crushed product is obtained in the form of a light fraction concentrate containing 30% iron. At the exit of the upper outlet pipe 15, a crushed product is obtained in the form of a dust fraction containing 5%

iron, which is used as a raw material for the preparation of building mixtures, etc. materials. At the outlet of the discharge pipe 16, a concentrate of a pulverulent fraction containing 60% iron is obtained.

Claims (2)

1. Device for grinding metal-containing raw materials, mainly for metal-containing raw materials, containing a grinding chamber with a pneumatic separation system, consisting of a vertical cylindrical body with a loading hole for metal-containing raw materials and discharge channels for ground products of light and heavy fractions, inside of which a rotating disk is placed on a vertical shaft with blades radially mounted on its upper surface with carbide elements and a conical divider, characterized I mean that the rotating disk is equipped with blades located on the lower surface of the rotating disk, on the upper surface of the rotating disk, an annular protrusion is made on its periphery, in which the blades abut, while the inner surface of the annular protrusion in the sections between the blades is mated to the surface of the rotating disk inclined plane, the pneumatic separation system contains, interconnected cone-shaped container with upper and lower outlet pipes for the crushed product of light fraction and vertical a tubular tank, the last of which is connected with the discharge channel for the crushed light fraction product made in the peripheral part of the upper end wall of the grinding chamber body, and a pressure chamber formed in the gap between the rotating disk and the lower end wall of the housing of the grinding chamber with an opening communicated with the atmosphere, the blades, made in the shape of a rectangular prism, have a bevel at the base from the side of its free end, while the length of the blades and the diameter of the base to of the cone divider, respectively, are taken no more than 0.25 and 0.5 of the diameter of the rotating disk, the angle of inclination of the generatrix of the cone divider is taken at least 45 °, and the discharge channel for the crushed heavy fraction product is made in the peripheral part of the lower end wall of the pressure chamber housing. 2. The device for grinding metal-containing raw materials according to claim 1, characterized in that the annular protrusion is made at a height not less than the height of the blades.