Method of gravity separation of minerals and apparatus to this end

FIELD: process engineering.

SUBSTANCE: invention relates to dressing of minerals, in particular, gold bearing sands. Proposed method comprises tangential feed of pulp into top working zone, forming pulp flow swirled crosswise and vortex flows inside chutes over their entire length wherein, at centrifugal forces acting on mineral particles, they are classified to density. Heavy particles are precipitated on inclined bottom of chutes to roll downward to make concentrate while light particles flow off the chute in swirling pump flow in tails. Intercone space is formed by setting limiting cone coaxially with concentrator cone. Said intercone space thickness is adjusted to maintain constant centrifugal force. Additionally, water is fed into intercone space working zone top part to form pulp and water flow swirling crosswise. Proposed apparatus comprises conical concentrator with cone-shaped working chamber with radially narrowing chutes, branch pipe for tangential feed of pulp and separation products unloading means. Said concentrator is furnished with limiting cone arranged coaxially with working chamber with adjustable clearance from chute wall edges. It comprises also water tangential feed branch pipe and pump feed branch pipe arranged at working chamber top section. Tail unloading means represent circular deflector arranged at cone bottom section coaxially with concentrate discharge opening.

EFFECT: higher efficiency of separation.

2 cl, 1 dwg

 

The invention relates to the field of enrichment of geomaterials, in particular of gold sand.

Known similar enrichment method in which the material is subjected to a separation process on an inclined plane density, for example in a stationary gateway, which has a flat rectangular trough, the bottom of which is placed the stencils. Heavy particles settle to the bottom of the gateway, and light are carried away by the flow of water. Through the use of stencils, due to the formation of vortices settled on the bottom of the gateway heavy materials are constantly vspuchivajutsja and pereymayutsya from light fractions [1].

The drawback of this method is that during the continuous feed of material to the cell stencil filled with heavy grains, after which the download should stop and make Spolek, i.e. wash concentrate from the bottom of the gateway in a separate receiver.

Known hydrocyclone, which carry out the method of mineral processing (geomaterials) the tapered hub with radially mounted tapering grooves, including tangential flow of the pulp in the upper working area, the formation of transverse twisting of the flow of pulp and vortex flow inside the gutters along their entire length, where under the influence of centrifugal forces on the mineral particles are separated by density sedimentation of heavy particles on the inclined bottom surface of the grooves and sliding down with the formation of the output of concentrates, the output light particles from the chute screw thread of the pulp in the tails [2].

The disadvantage of this method and apparatus is that it is required to apply a high pressure source of pulp for the removal of small and light fraction through the top outlet with high resistance environment due to the presence of radial ribs, the degree of separation of minerals by density is considerably smaller.

The higher efficiency of separation density is achieved in the proposed method of enrichment of geomaterials implemented the tapered hub with radially mounted tapering grooves, including tangential flow of the pulp in the upper working area, the formation of transverse twisting of the flow of pulp and vortex flow inside the gutters along their entire length, where under the influence of centrifugal forces on the mineral particles are separated by density sedimentation of heavy particles on the inclined bottom surface of the grooves and sliding down with the formation of the output of concentrates, the output light particles from the chute screw thread of the pulp in the tails, characterized in that they form a cone space by installing coaxial cone hub, restrictive cone, regulate the thickness of the cone space to maintain a constant level centrales the second force, additionally carry out the water supply in the upper part of the working area-cone space for forming transverse twisting of the flow of pulp and water.

The proposed method for the enrichment of the tapered hub can be implemented in the apparatus, which includes a working chamber in the form of a cone with radial mounted tapering grooves, the tangential nozzle for feeding the pulp, devices for unloading separation products, characterized in that the hub is provided with a limiting cone mounted coaxially working chamber with adjustable clearance from the edges of the walls of the grooves, the tangential nozzle for water supply, established as a branch pipe for feeding the pulp in the upper part of the working chamber, a device for discharging tailings made in the form of an annular cutter located at the bottom of the cone coaxial with the hole for the discharge of concentrate.

Comparable analysis of the claimed method with similar shows that in contrast to the gateway with stencils deposited on the bottom surface tapering grooves heavy particles have the ability to move in the direction of the discharge due to the inclination of the chute, resulting in the possibility of continuous enrichment method. Thus, the comparative analysis of the proposed concentrator with analog allows SDE is the substance of the conclusion conforms to the criterion "novelty".

Known technical solutions, such as the prototype separation of particles in density occurs in the working chamber in the form of a cone with radial mounted tapering grooves and unloading of light fractions occurs through the drain pipe in the upper part of the working chamber, in the claimed solution to the separation of particles in density occurs in the downward flow without education compulsory rising eddies in the space formed in the chamber in the form of a cone with radial mounted tapering grooves and coaxially installed inside the working chamber of the bounding cone with adjustable width-cone space, where the conditions for effective separation of minerals by density.

Thus, a comparative analysis of the proposed hub prototype allows to make a conclusion about its compliance with the criterion of "inventive level".

The invention is illustrated graphic material, figure 1 shows a vertical section of the hub.

Centrifugal cone hub consists of a cone (1) with radial mounted tapering grooves (2), the bounding cone (3), which is located coaxially inside the cone (1). The nozzles (4) and (5) for the filing of the original pulp and additional water is installed in the upper part of the cone (1) so that the bullet is and has been working in the area tangentially. Also the hub is fitted coaxially mounted annular cutter (6) for the discharge of tailings and an opening for the discharge of concentrates (7).

Centrifugal cone hub operates as follows.

The original pulp and additional water under pressure tangentially served in the upper part of the cone (1) through the nozzles (4) and (5) to create a transverse screw threads over the grooves in the cone space and vortex flow inside the gutters along their entire length.

Heavy density mineral grains will concentrate inside the grooves (2) cone (1), and light - to the inner contour of the bounding cone (3). Vortical flows inside the gutters constantly Usacheva and perejimaut concentrated inside the gutters of heavy mineral grains from light fractions. Further heavy density mineral grains gradually roll down and are discharged through the opening (7), and lightweight material by gravity flow is discharged through the annular cutter (6). Hydrodynamics of craters formed such that when the steady vortex flow, while maintaining a constant head of water, the process samopodderzhivanie.

Literature

1. Abramov A.A. Processing, enrichment and comprehensive utilization of solid minerals. M. Sholokhov Moscow state University, 2001, str-218.

2. Hydrocyclone classification and about the stop of minerals. SU 1655575 A1, 15.06.1991, WV 5/34.

1. The way gravity separation of minerals, including tangential flow of the pulp in the upper working area, the formation of transverse twisting of the flow of pulp and vortex flow inside the gutters along their entire length, where under the influence of centrifugal forces on the mineral particles are separated by density sedimentation of heavy particles on the inclined bottom surface of the grooves and sliding down with the formation of the output of concentrates, the output light particles from the chute screw thread of the pulp in the tails, characterized in that they form a cone space by installing coaxial cone hub bounding cone, regulate the thickness of the cone space to maintain a constant level of centrifugal force, additionally carry out water supply in the upper part of the working area-cone space for forming transverse twisting of the flow of pulp and water.

2. The tapered hub, comprising a working chamber in the form of a cone with radial mounted tapering grooves, the tangential nozzle for feeding the pulp, devices for unloading separation products, characterized in that the hub is provided with a limiting cone mounted coaxially working chamber with adjustable clearance from the edge of the walls of the troughs, p is trubka for tangential feed water, established as a branch pipe for feeding the pulp in the upper part of the working chamber, a device for discharging tailings made in the form of an annular cutter located at the bottom of the cone, coaxial hole for discharge of concentrate.



 

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