RU2301113C2 - Centrifugal concentrator - Google Patents

Abstract

FIELD: separating solid materials.

SUBSTANCE: centrifugal concentrator comprises housing, inner rotating conical cap provided with openings for discharging heavy fraction, device for supplying water, shaft of the drive used as a charging branch pipe and made of cylindrical pipe with openings for discharging the material in the bottom section of the cap, device for discharging concentrator, and peripheral device for discharging tailings. The inner cap is provided with Z-shaped riffles whose front sections represent shields for reducing the pressure of the centrifugal force on the opening for discharging heavy fraction made from the back side of the riffles. The device for supplying water is made of a jacket mounted inside the housing and provided with sloping nozzles for water discharge that are arranged in front of the openings for discharging heavy structure. The cylindrical pipe of the charging branch pipe is provided with the diverging section in its bottom part and device for discharging concentrator made of a conical discharging ring pocket for finely divided concentrate and discharging branch pipe for the coarse concentratorprovided.

EFFECT: enhanced efficiency.

1 dwg

Description

The invention relates to the field of classification and mineral processing.

Centrifugal concentrators are known, for example, a Knelson concentrator, the working body of which is a conical, hemispherical or parabolic bowl with annular corrugation from the inside [1]. The bowl is brought into rapid rotation, and water and the starting material are supplied to the central part. Under the influence of centrifugal force, light minerals are carried outside the concentrator bowl, and heavy minerals fall into the grooves of the grooves and accumulate in them.

More efficient operation of centrifugal concentrators is carried out in a cyclic mode of operation. After a certain period of operation, the concentrator is stopped, and the accumulated concentrate is unloaded.

Closest to the claimed is a separator for minerals [2], consisting of a housing, an internal rotating cone with perforation in the form of narrow annular slots, an external cone, a supply pipe for water supply, where the external cone is mounted with the possibility of axial reciprocating movements, and the internal the cone is equipped with a grill mounted on its inner surface.

The disadvantage of this device is the difficulty of continuously unloading part of the concentrate that has settled in the annular flares.

Ensuring stable continuous operation, as well as improving the quality of separation of mineral grains by density, is achieved in the proposed continuous centrifugal concentrator, consisting of a housing, an internal rotating bowl with holes for outputting a heavy fraction, a device for supplying water, a drive shaft, acting as a loading nozzle, made in the form of a cylindrical pipe with holes for the exit of material in the lower part of the bowl, a device for unloading concentrate and peripheral unloading device and tails, characterized in that the inner bowl is made with Z-shaped cross-sectional grooves, the front of which serves as a screen to reduce the pressure of the centrifugal force on the holes for outputting the heavy fraction, which are made on the back side of the grooves, while the device for supplying water is made in the form of a water jacket installed in the housing with inclined nozzles for pumping water, located opposite the holes for outputting a heavy fraction, the cylindrical tube of the loading pipe made with an extension of n bo ttom portion and for discharging the concentrate device - in the form of a cone-shaped annular pockets for unloading fine concentrate and rougher concentrate discharge pipe.

Comparative analysis with the analogue shows that in the proposed embodiment, the concentrate is continuously released through the slots between the flutes into a cone-shaped discharge ring pocket for small concentrate and the discharge pipe of coarse concentrate, whereas in the analogue this happens cyclically. Therefore, the present invention meets the criterion of "novelty."

In contrast to the prototype [2], where the principle of continuous separation also applies, the concentrate is separated from the rotor surface and, overcoming the hydrodynamic effect of the flow, falls into the concentrate receiver using intense axial vibrations, in the proposed embodiment, the nature of the concentration of heavy particles on the working surface fundamentally changes riffle. Due to the “Z” shaped shape of the arrays and the presence of free slots from the side of the casing, heavy minerals first accumulate near the vertical wall and, thanks to the centrifugal force and a slight tilt of the wall, the concentrate is gradually unloaded and goes into the intermediate space between the inner bowl and the casing, subsequently exposed to counter-directed water jets injected from nozzles located opposite the openings, where additional bubbling occurs with the cleaning of heavy fractions, the front part of the “Z” shaped the corrugation serves as a screen to reduce the pressure of centrifugal force on the free opening, particles on the surface of the body gradually slide into the discharge ring pocket for small concentrate.

Thus, a comparative analysis allows us to conclude that the criterion of "inventive level".

The invention is illustrated in the drawing.

The classifier consists of an inner bowl 1 with special corrugation 2, slots on the flutes 3, a drive shaft acting as a loading pipe 4 made in the form of a cylindrical pipe with an extension on the bottom. In the lower part of the pipe there are openings for the exit of material 9, a housing with a water jacket 5, an unloading nozzle for coarse concentrate 6, an unloading annular pocket for small concentrate 7, a nozzle for supplying water 8, an unloading device for the tails 10, an attachment unit 11, an electric motor 12.

The inner bowl 1 is rotated. Through pipe 4, a mixture of the starting material with water is supplied. Under the influence of centrifugal force, the starting material is intensively scattered from the loading pipe onto the working surface of the classifier and moves upward along a helical line to the upper edge of the bowl. To stabilize the flow from the waterbag through the nozzle 8, an additional controlled flow of water is supplied under pressure. In this case, the lightest minerals move up and, reaching the edges of the separation chamber, fall into the discharge device of the tails 10. Heavy minerals fall into the recesses of the corrugations 2 and fall through the slots 3 to the concentrate receiver 7.

As the flow advances to the exit from the working chamber, the working surface of the inner conical bowl 1 accordingly increases. As a result, the frequency of collisions of fragments with particles of the useful component decreases. Due to this, the separation effect is increased and particles of the useful component that have not failed, along the flute 2, slide into the concentrate receiver 7.

Literature

1. Bocharov V.A., Ignatkina V.A. The technology of enrichment of gold-containing raw materials. M .: Publishing House "Ore and Metals", 2003. - 408 p.

2. Mankov V.M., Malkov V.F., Krekhov A.V. Separator for minerals. RU 2019295 C1, 09.15.1994, B03B 5/32, 5 s.

Claims (1)

A continuous centrifugal concentrator, including a housing, an internal rotating conical bowl with holes for outputting a heavy fraction, a water supply device, a drive shaft acting as a loading nozzle made in the form of a cylindrical pipe with holes for material outlet in the lower part of the bowl, an unloading device concentrate and peripheral discharge device of the tailings, characterized in that the inner bowl is made with Z-shaped cross-section riffles, the front of which serves as a screen m to reduce the pressure of the centrifugal force on the holes for outputting the heavy fraction, which are made on the back side of the grooves, while the device for supplying water is made in the form of a water bag with inclined nozzles for pumping water, located opposite the holes for outputting the heavy fraction, the pipe of the loading nozzle is made with expansion in the lower part, and the device for unloading the concentrate is in the form of a cone-shaped unloading annular pocket for small concentrate and a loading branch pipe of rough concentrate.