SU725703A1 - Apparatus for centrifugal separation of mineral particles - Google Patents

Description

(54) APPARATUS FOR CENTRIFUGAL SEPARATION OF MINERAL PARTICLES

one

The invention relates to the separation of minerals according to their density and size in a ueHt rolling field and can be used for thickening, classification and enrichment operations in the mining industry.

A device for enrichment and classification of minerals is known, comprising a chamber formed by an inner (or outer) cylinder, an outer (or, respectively, inner) cone and end caps, a supplying tangential port for pulp injection and a tangential discharge pipe in the form of a narrow slit radial faceplate of the widened part of the chamber 1.

However, this apparatus does not allow for a sufficiently clear separation of minerals. This is due to the fact that the radial movement of heavy particles entering the chamber near the inner surface is not sufficient to reach the outer wall of the chamber during their stay in the apparatus.

The required radial movement of the particles as the pulp approaches unloading increases all the time due to the expansion of the chamber. Moving heavy

particles to the outer wall are also slowed by a counter flow of fluid (radial component of the flow velocity). An increase in the radial displacement of particles due to an increase in the intensity of the centrifugal field does not give a positive effect, since this requires an increase in volumetric productivity and, consequently, a decrease in the residence time of the particles in the chamber. In addition, the separation clarity reduces the effect of turbulent diffusion, since

there are no dividing zones between adjacent zones of formation and release of various products.

The aim of the invention is to improve the accuracy of separation of mineral particles in a centrifugal field during the processes of classification and enrichment (in an aqueous medium or mineral suspension).

Claims (2)

This is achieved by placing inside the expanding cyclone chamber of a cascade of flat rings with gradually varying internal or external diameter, installed with gaps and coaxially with the vertical axis of the chamber, preferably movable in the axial direction of the cavity. FIG. 1 shows an apparatus with an outer, and FIG. 2 - with an internal cone. The apparatus for separating particles of rjo density and particle size consists of a cylinder 1 and a cone 2, interconnected by end caps 3 and 4, forming a cyclone chamber, a tangential feed pipe 5, tangential relief pipes 6 and 7, which can be cross-sectioned & WATB (:: th, -KaSa yyyyabe ygkh rings 8 with different diameters, mechanism 9 axial movement of the cascade of rings. The rings are installed with gaps between the cylinder 1 and the cone 2 so that they form flow-through 10 and 11 zones. 12 zone. The gap between the cone 2 and the rings 8 is adjusted by means of an axial movement mechanism 9. The apparatus operates as follows: The initial pulp through the nozzle 5 enters the cyclone chamber under pressure tangentially. Three zones are formed inside the chamber that differ from each other in the pulp flow dynamics: flow 10 zone at cylinder 1, characterized by a cylindrical pulp flow from screw pipe 5 to pipe unloading pipe 7; a flow through area 11 at the cone 2, which is characterized by a screw-expanding pulp flow from the nozzle 5 to the unloading nozzle 6; a dividing 12 zone in the space between the flat rings; characterized with a cylindrical rotating flow without an axial velocity component. In the flow-through zone 10, particles that had time to move due to centrifugal. , forces to the dividing zone 12, under the influence of the same forces, will pass between the rings 8 of zone 12 into the flow zone 11 and unload through pipe 6 regardless of the point in height they approached in zone 10 to zone 12. 7 3 4 Thus, the flow of pulp in zone 10 as it approaches the discharge port 7 is depleted in heavy particles, and in the flow of pulp in zone 11, these particles are accumulated and transported to unloading. The control of the operation modes of zones 10 and 11 is carried out by means of a mechanism. 9 and changes in nozzle sections on discharge nozzles 6 and 7. Light particles trapped in zones 11 and 12 are gradually forced out by a heavier mechanical mixture to zone 10 due to the pressure difference. The presence of the dividing zone 12 also reduces the negative effect of turbulent diffusion between zones 10 and AND, both within the cyclone chamber and at the point of discharge of the separation products. This increases the separation efficiency. An apparatus with a cyclone chamber made with an internal cone works according to the same principle. Claim 1. An apparatus for centrifugally separating mineral particles, including an expanding cyclone chamber and supply and discharge nozzles, characterized in that, in order to improve accuracy, It is provided with a cascade of flat rings with a gradually changing inner or outer diameter, installed with gaps and coaxially with the vertical axis of the chamber. 2. An apparatus according to claim 1, characterized in that, in order to be able to regulate the process, a cascade of rings is mounted movably in the axial direction of the chamber. Sources of information, please note in the examination 1. USSR Copyright Certificate № 486789, cl. B 03 B 5/32, 1974.