Dense medium gravity separator for beneficiation of small and medium grades of coal

 

(57) Abstract:

Use: for the separation of fine-grained material density in a difficult environment in centrifugal and gravitational field. Essence: tailoredmail separator, comprising a cylindrical tub with loading and unloading device, as well as the scraper device for removing from the surface of the suspension, equipped with a camera pre-separation, made in the form of a curved shank with a constant cross-sectional area and connected to the cylindrical part of the bath through a rectangular flanges. Unloading device of the separator is made with a dehydrator and overflow threshold for removal of the light fraction. 2 Il.

The invention relates to the field of mineral processing, namely the process of separating materials by gravity in a difficult environment in centrifugal and gravitational field.

Known separator for beneficiation of fine mineral classes, including cylindrical tub, loading and unloading devices and Grabovoi device for discharging the light fraction.

The disadvantage of this device is not high enough effectivnogo in the separator in the inclined chute, creates undesirable turbulent flow in a bath of the separator, causing mixing of the already separated material.

The purpose of the invention is improving the efficiency of separation of the material by reducing the clogging of the heavy and light products by unauthorized parties.

This objective is achieved in that the separator containing a cylindrical tub, loading and unloading devices, Gribkova device, the drying device equipped with a camera pre-separation of material made in the form of a curved shank with a constant cross-sectional area. The connection of the camera pre-separation by the separator and the boot device is made with rectangular flanges below the overflow threshold of the dewatering device. The magnitude of the flanges vertically less than the distance from the bottom of the cylindrical bath to the level of the overflow threshold value of 0.01-0.1 D, where D is the diameter of the bath, and the large side of the input flange perpendicular to the axis of the separator, large side output flange parallel to the axis of the separator. Grabovoi device made in the form of radially oriented plates, porogen baths.

The inventive device differs from the prototype.

The separator is further provided with a camera pre-separation of material made in the form of a curved shank with a constant cross-sectional area.

The connection of the camera pre-separation by the separator and the boot device is made by means of the flanges below the overflow threshold of the dewatering device. The magnitude of the flanges vertically less than the distance from the bottom of the cylindrical bath to the level of the overflow threshold value of 0.01-0.1 D, where D is the diameter of a bath.

Flanges camera pre-separation of materials is oriented so that the long side of the input flange perpendicular to the axis of the separator, and the large side output flange parallel to the axis of the separator. Grabovoi device made in the form of oriented plates immersed to the depth of the bath, and the distance between the peripheral edges of the plate is smaller than the height of the cylindrical part of the bath.

Of these signs similar is the presence of Grabovogo fixtures, and distinctive features of the prototype is that plate Grabovogo device p is the height of the cylindrical part of the bath.

Thus, the inventive separator meets the criterion of "novelty."

The comparison of the proposed solutions with other known technical solutions revealed that the establishment of a separator between the bathroom and the boot device camera pre-separation of material density, made in the form of curvilinear tetrahedral with a constant cross-sectional area, improves the efficiency and accuracy of separation due to the fact that in the process of reorientation of the flat flow from the horizontal to the vertical plane appear the pressure gradients that contribute to the stratification of the material and its distribution along the height of the bath of the separator. When this light particles enter the upper part of the bath, and heavy at the bottom.

The camera pre-separation of material attached to the separator through the rectangular flanges below the threshold level dewatering device. The magnitude of the flanges vertically less than the distance from the bottom of the cylindrical part of the tub to the level of the overflow threshold value of 0.01-0.1 D, where D is the diameter of the tub. The selected shape, the location and size of the flanges provide input enrich the material on the measures pre-separation of materials with the larger side of the input flange perpendicular to the axis of the separator, and large output side flanges parallel to the axis of the separator, provides uniform distribution of material on the height of the bath of the separator and prevents movement of the emerged light particles flow of material entering the separator.

Grabovoi device made in the form of vertical radially oriented plates immersed to the depth of the cylindrical part baths. The distance between the peripheral edges of the plates is smaller than the height of the cylindrical part baths. With this arrangement, the plates Grabovogo device effectively suppress turbulent flow, which reduces the accuracy of the separation.

Thus, the claimed technical solution meets the criterion of "inventive step".

In Fig. 1 shows a dense medium gravity separator, cut, and Fig. 2 - the same, top view.

The separator includes located between two coaxial cylinders 1 and 2 ring 3 bath with a conical bottom part 4, installed in the inner cylinder stationary dewatering device 5, the vertical Grabovoi device 6, the boot 7 and unloading 8 device, Kam is constant cross-sectional area, attached to the separator below the overflow threshold of 10 dewatering device through the rectangular flanges 11, the dimensions of which are vertically less than the distance from the bottom 12 of the cylindrical bath to the level of the overflow threshold dewatering device on the value of 0,01-0,1 D, where D is the diameter of the tub. Large side 13 of the input flange perpendicular to the axis of the separator, and the large side 14 of the output nozzles parallel to the axis of the separator. Grabovoi device 6 made in the form of vertical radially oriented plates 15, sunk to the depth of the cylindrical part baths. The distance between the peripheral edges 16 of the plates is smaller than the height of the cylindrical part of the bath.

The separator operates as follows.

The source material and the suspension is mixed into the loading device 7 and fed into the chamber 9. In the chamber there is a partial separation of material density and flux distribution along the height of the bath of the separator. The generated flow through the flange 11 attached to the separator below the overflow threshold of 10 dewatering device 5 enters the annular tub 3, located between coaxial cylinders 1 and 2. In the circular tub of origin Taiwan which is less time in addition, the rotation at a given speed and a significant weakening of the currents that reduce the efficiency of separation is provided Gribkova device 6, provided with vertical radially oriented plate 15. Under the action of centrifugal and gravitational forces heavy particles, moving in a downward spiral, move into the conical section of the tub 4 to the discharge device 8, while light particles moving in an upward spiral, pop up and unloaded, passing through the conical drying device 5. Reset separated environment, passing through the dewatering sieve screen 5 is made through a separate pipe.

The proposed device is compared with the prototype reduces loss of light fraction from the heavy product of 0.1%, which increases the overall efficiency of the enrichment compared with the separator of known construction.

Dense medium gravity SEPARATOR FOR BENEFICIATION of SMALL AND MEDIUM GRADES of COAL, including cylindrical tub, loading and unloading devices, Gribkova device, characterized in that it is equipped with camera pre-separation, made in the form of a curved shank with a constant area of p is full-time fixture is made with a dehydrator and overflow threshold for removal of the light fraction, thus the value of the flanges vertically less than the distance from the overflow threshold to the lower edge of the cylindrical part of the bath in the amount of 0.01 - 0.1 of the diameter of the latter, the sides of the flanges parallel to the axis baths, and Grabovoi device made in the form of radially oriented fins.

 

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