Geo-technological complex with aero-hydrodynamic activation

FIELD: motors and pumps; mining engineering.

SUBSTANCE: geo-technological complex with aero-hydrodynamic activation includes bottom-hole hydraulic washing-out module, rocks fraction separation system, force-feed hydro transportation system, processing complex with dumping system. The geo-technological complex is provided with the mechanical activation module for coarse fractions with movable initiating plant and aero hydrodynamic activation module for middle-size fractions. The aero hydrodynamic activation module is provided with pressurized air supply system being installed in the place of rock bulk material feeding. The pressurized air supply system nozzles are installed shifted and horizontally in a staggered manner. The stationary flat reflecting elements are installed at aero hydrodynamic activation module pit edges and tilted in vertical plane. The above elements are also shifted in horizontal plane with regard to each other. The aero hydrodynamic activation module is linked with fine fraction accumulation module. Radial reflecting elements are installed symmetrically to the stationary flat reflecting elements but shifted horizontally with regard to them along rock mass feeding direction and from the opposite side of pit edge.

EFFECT: increased effectiveness of sandy and clay rocks state and properties change.

6 dwg

 

The invention relates to the extraction of valuable minerals from medium to high plasticity sandy-argillaceous (clay content of 7 and more than 40 percent) in the open development of gold-bearing placer deposits.

Known geotechnical systems based on physico-chemical preparation of metalliferous clay sand gravel deposits, including chemical softening clay cement sand with mechanical, hydraulic loosening and filtration, drainage, moisture, mechanical and hydraulic fracture cemented clay sand when handling reagent additives, classification and screening, physical-chemical treatment vzveshennymi of mesopotam solutions of reagents, physico-chemical aggregation of mineral particles and the gravitational settling of flocs in the process water, pre-thickening and dewatering slurries, physico-chemical clogging of the first space Gale-evalnih breeds, storage of cereals in the goaf and clarifiers, water treatment and the conditioning of waste and recycling water, transportation clarified water to flush installation [1].

Their main drawback is the use of polyelectrolyte complexes as flocculants and coagulants. This requires tight control OST the exact concentrations of metal ions in the treated water and Toxicological evaluation.

Known geotechnical complexes, including the physical and mechanical training complex receiving and distribution devices, multi system, screens, processing and beneficiation complex [2].

This geotechnological complex has a multi-level system of screens, but the technological parameters of the system do not allow efficient enough to produce the disintegration of clay placers with inclusions of rocks increased strength.

The closest in technical essence is geotechnological complex with multilevel disintegration, including module jet slaughter, the system of fractional separation rocks by size, system pressure hydrotestosterone, dumping and processing complex [3].

This geotechnological complex does not allow to modify the structural and mechanical condition (geometric morphometric and energy parameters of the system), mechanical, rheological, thermal and physico-chemical properties of sandy-clayey rocks.

The technical result is the intensification of the process of directed change the status and properties of sand and clay rock by mechanical activation and formation of the desired directional distribution of energy is whom the impact of periodic supply air mixture under pressure.

The technical result is achieved by the fact that geotechnological complex hydrodynamic activation, including module jet slaughter, the system of fractional separation rocks by size, system pressure hydrotestosterone, processing complex system of dumping, equipped with a module mechanical activation of large fractions with mobile originating setup and fluidic module activation fractions of medium size, while the fluidic module activation is supplied installed in the zone of receipt of his rock mass system periodic supply air mixture under pressure, and the nozzle system of periodic supply air mixture under pressure offset set in a checkerboard pattern in the horizontal plane, with the side Board pit fluidic module activation associated with the storage modulus of the fine fraction, sloped in a vertical plane and offset relative to each other in the horizontal plane of the flat stationary reflective elements, and symmetrically them, with the offset in the horizontal plane relative to the stationary plane of the reflective elements in the course of receipt of the rock mass, with the opposite side of the side of the pit, set the radius of the s reflective elements.

Supply of the module mechanical activation of large fractions with mobile originating setup and fluidic module activation fractions of medium size with a periodic system supply air mixture under pressure through a nozzle, mounted offset in a staggered manner in a horizontal plane, as well as the presence of a combination of reflective elements creates the effect of intensification of the process of directional changes of the status and properties of a sandy-clayey rocks.

Offer geotechnological complex hydrodynamic activation shown on the drawings.

Figure 1 shows a General view of the complex in the industrial area of the polygon; figure 2 - section a-a in figure 1, shown flat and curved reflective elements and movable initiating module installation mechanical activation of a large fraction; figure 3 - a view B in figure 1, shows the location of the nozzles of the periodic system supply air mixture under pressure; figure 4 is a view In figure 3, shown installed with an offset in a staggered manner in the horizontal plane of the nozzle; figure 5 - view of G in figure 1, shows the slope of the stationary plane of the reflective elements in the vertical plane, providing the direction of the flow with destroyed particles of rocks in the upper layers of the suspension; figure 6 - geotechnical scheme is and directional changes the state of sandy-argillaceous rocks in the water.

Geotechnological complex hydrodynamic activation module contains jet slaughter 1, the system of fractional separation rocks by size 2, system pressure hydrotestosterone 3, processing complex 4 with dumping 5. The system of fractional separation rocks by size 2 equipped with a monitor setting of 6. Above the pit 7 module mechanical activation of large fractions 8, 9 overpass installed the initiating mobile unit 10. Over area 11 of receipt of the rock mass fractions of medium size in the pit 12 module Aerohydrodynamic activation 13 installed periodic supply air mixture under pressure 14. The nozzle 15 of the periodic system supply air mixture under pressure 14 offset set to 16, in a checkerboard pattern in the horizontal plane 17. Side flanges 18 of the pit 12 module Aerohydrodynamic activation 13 associated with the storage modulus of the fine fraction 19, sloped 20 in the vertical plane 21 and offset 22 relative to each other in the horizontal plane 23 of the stationary plane of the reflective elements 24. Symmetrically flat stationary reflective elements 24 at offset 25 in the horizontal plane 23 is relatively flat stationary reflective elements po during receipt of the rock mass from the zone 11, on the opposite side of the bead 26 of the pit 12, set radius of the reflective elements 27.

The level of the bottom of the pit 7 is made above the level of the bottom of the pit 12. The trenches 7 and 12 connects the gutter 28. Board 18 that separates the pit 12 and the pit 29 of the storage modulus of the fine fraction 19, is made with a decrease in side system pressure hydrotestosterone 3 for directional revenues fines breed of fluidic module activation 13 in the storage modulus of the fine fraction 19. The system of fractional separation rocks by size 2 fitted with guide vanes and dezintegriraat shield 30 with the slots 31. The slit 31 is made on the side 32 of the shield 30, the mating zone 11. The end 33 of the shield 30 partially overlaps the inlet 34 in the module mechanical activation of large fractions 8 to the orientation of the pulp with large pieces on the Board 35. The bottom of the pit 7 is made with a slope of 36 in the side flanges 37 and of the pit 12 and a slope of 38 in the side of the ditch 28. Weekend slots 39 nozzles 15 are located along the incoming flow rocks of zone 11, and the output slit 40 of nozzles 15 are located towards the incoming stream of rocks with water. Mobile initiating the installation 10 includes a working body 41, rotating with variable frequency.

Geotechnological complex hydrodynamic activation works as follows.

After forming in the area ol the industrial landfill pits 7, 12, 29, is designed for large, medium and fine fractions, and perform ditches 28 connecting the pit 7 pit 12, and forming a bead 18 which separates the pits 12, 29, and decrease toward the system pressure hydrotestosterone 3, starts the operating cycle of production. Destroyed a jet stream, the jet of the face 1, the breed by gravity transportation, by gravity or by using additional means, falls within the area of fractional separation rocks by size 2. With a jetting installation 6 breed is pre-softening and moving large pieces in the pit 7 module mechanical activation of large fractions 8. Pieces of the rock is medium in size and less through slots 31, which is made on the side guide 32 and dezintegriruetsja shield 30 are in zone 11 pit 12 module Aerohydrodynamic activation 13. The end 33 of the shield 30 partially overlaps the inlet 34 in the module mechanical activation of large fractions 8, orienting the pulp with large pieces on the Board 35. In module mechanical activation of large fractions 8 through initiating installation 10 sliding on the ramp 9 along the work area, by mechanical activation lumpy rocks near the edge 35. Activation is made at frequent variable is the rotation of the working body 41. As rock breaking the bead 35 pieces of medium size are 36 to bias Board 37 and, optionally collapsing under the action of hydrodynamic forces that move the ramp 38 to the gutter 28. Received in zone 11 pit 12 pieces of medium size are subjected to aerodynamic activation using the periodic system supply air mixture under pressure 14. Through exit slits 40 nozzles 15 located toward the incoming stream of rocks with water from zones 11 and installed with an offset of 16, in a checkerboard pattern in the horizontal plane 17 is periodically supply air mixture under varying time steps and the magnitude of the impact pressure. Pressure jets air mixture from neighboring nozzles 15 is not extinguished due to displacement of 16 nozzles 15. Creates a zone of high energy impacts on pieces of rocks of medium size in fluidic module activation 13. Through the nozzle 15, the output gap 39 which are located along the incoming flow of the breed, is adjustable by the value of the energy parameter (power, pressure) supply air mixture to twist and move water and alluvial environment with a solid component of the slurry in the range of flat stationary reflective elements 24, defined by flanges 18 offset 22 relative to the tion to each other in the horizontal plane 23, and curved reflective elements 27 that are installed with offset 25 in the horizontal plane 23 on the opposite side of the bead 26 of the pit 12. Reflected from the curved reflective elements 27, pulp with inclusions of elements of sandy-argillaceous rocks subjected to additional hydrodynamic activation. Tilt 20 flat stationary reflective elements 24 in the vertical plane 21 provides the direction of the reflected flux to the upper layers of the pulp, moving the crushed part of the solid phase of the breed in the following area of the fluidic module activation 13. In the next area, in the higher layers of rock exposed again twisting, disintegration and transition into the next area to repeat the process and move through the lower Board 18 that separates the pit 12 and the trench 29 in the storage modulus of the fine fraction 19. Through the system pressure hydrotestosterone 3 prepared by hydrodynamic activation breed arrives at the processing complex 4 with dumping 5.

The complex provides a directional change of the status and properties of a sandy-clayey rocks of mechanical activation and the formation of a distribution of the energy impact of periodic supply air mixture under time-varying and the magnitude of the pressure and directed the mi pulses reflective elements.

Sources of information

1. Main VP improving the efficiency of processing clay gold-bearing Sands: part 2 / main VP - cheat: Citgo, 1996. - 119 C.

2. Mankov V.M. Application of centrifugal-gravity method to extract fine gold from placers / Mankov V.M., Tarasova T.B. obog. - 1999, No. 6, p.3-8, 6.

3. Pat. 2206403, Russian Federation, IPC7WV 5/00, AS 41/26. Geotechnological complex with multi-disintegration / Khrunina N.P.; the Applicant and patentable. Mining Institute, Feb RAS, Appl. 08.02.2002; publ. 20.06.2003, bull. No. 17.

Geotechnological complex hydrodynamic activation, including module jet slaughter, the system of fractional separation rocks by size, system pressure hydrotestosterone, processing complex system of dumping, characterized in that it is equipped with a module mechanical activation of large fractions with mobile originating setup and fluidic module activation fractions of medium size, while the fluidic module activation is supplied installed in the zone of receipt of his rock mass system periodic supply air mixture under pressure, and the nozzle system of periodic supply air mixture under pressure offset set in staggered horizontally in the plane, however, the sides of the pit module Aerohydrodynamic activation associated with the storage modulus of the fine fraction, sloped in a vertical plane and offset relative to each other in the horizontal plane of the flat stationary reflective elements, and them symmetrically offset in the horizontal plane relative to the stationary plane of the reflective elements in the course of receipt of the rock mass on the opposite side of the side of the pit is set radius of the reflective elements.



 

Same patents:

FIELD: motors and pumps; mining engineering.

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EFFECT: increased effectiveness of sandy and clay rocks state and properties change.

6 dwg

FIELD: mining, particularly open cast mining.

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Vibro concentrator // 2340401

FIELD: mechanics, mining.

SUBSTANCE: invention can be sued for extracting useful component from various drain-like materials. The proposed vibro concentrator concentration element with symmetric crosswise ribs is separated into isolated sectors by separating crosswise ribs arranged in symmetry to the aforesaid crosswise ribs but with an inclination arranged in mirror-like position. The symmetric crosswise ribs arranged inside every said sector are tightly connected both between themselves and with the separating crosswise ribs by means of their inner end face edges with a gap between the said edges and lengthwise walls. There are tail removal holes arranged in every sector nearby the inner and outer edges of the aforesaid separating ribs and in symmetry with the lengthwise axial line of the concentration element, the said holes being screened by the side inclined walls with the height equal to that of crosswise ribs. The inner end faces of the separating crosswise ribs and outer end faces of symmetric crosswise ribs feature a gap between them and the side inclined walls that screen the tail removal holes. The receiving box has an outlet arranged in its central part to feed the starting material into the first concentration element sector, if seen on the feed side. The starting material feed channels are arranged between the said tail removal holes screened by vertical walls with the height exceeding that of the crosswise ribs. The vibro concentrator end, opposite the feed one, is furnished with a slit-like hole to remove the tails coming out through the edges of separating crosswise ribs, the most distance from the feed side, the aforesaid slit-like hole being screened, on its outside, by a crosswise vertical wall with the height exceeding that of the said crosswise ribs. The concentrate receiving devices are arranged at outer ends of the last separating ribs, screened by the side inclined walls with the height exceeding that of the crosswise ribs and having an adjustable gap at their lower part.

EFFECT: higher efficiency of gravity concentration.

2 cl, 2 dwg

Vibro concentrator // 2340401

FIELD: mechanics, mining.

SUBSTANCE: invention can be sued for extracting useful component from various drain-like materials. The proposed vibro concentrator concentration element with symmetric crosswise ribs is separated into isolated sectors by separating crosswise ribs arranged in symmetry to the aforesaid crosswise ribs but with an inclination arranged in mirror-like position. The symmetric crosswise ribs arranged inside every said sector are tightly connected both between themselves and with the separating crosswise ribs by means of their inner end face edges with a gap between the said edges and lengthwise walls. There are tail removal holes arranged in every sector nearby the inner and outer edges of the aforesaid separating ribs and in symmetry with the lengthwise axial line of the concentration element, the said holes being screened by the side inclined walls with the height equal to that of crosswise ribs. The inner end faces of the separating crosswise ribs and outer end faces of symmetric crosswise ribs feature a gap between them and the side inclined walls that screen the tail removal holes. The receiving box has an outlet arranged in its central part to feed the starting material into the first concentration element sector, if seen on the feed side. The starting material feed channels are arranged between the said tail removal holes screened by vertical walls with the height exceeding that of the crosswise ribs. The vibro concentrator end, opposite the feed one, is furnished with a slit-like hole to remove the tails coming out through the edges of separating crosswise ribs, the most distance from the feed side, the aforesaid slit-like hole being screened, on its outside, by a crosswise vertical wall with the height exceeding that of the said crosswise ribs. The concentrate receiving devices are arranged at outer ends of the last separating ribs, screened by the side inclined walls with the height exceeding that of the crosswise ribs and having an adjustable gap at their lower part.

EFFECT: higher efficiency of gravity concentration.

2 cl, 2 dwg

FIELD: mining engineering.

SUBSTANCE: invention relates to mineral dressing, namely, gravity dressing equipment. It can be used for extracting a valuable mineral from various granular materials. According to the invention, the vibrator concentrator has a concentration part with symmetrised transverse ribs divided into separate sectors by means of separating transverse ribs similar to the symmetrised transverse ribs, but with an inclination in a reflection similar position. In addition, the external butt ends of the separating transverse ribs are tightly connected with longitudinal walls by passages manufactured between their internal butt ends from sector to sector along the center line of the concentration part. A similar passage is also manufactured from the inlet box screened by the separating transverse ribs from the working side of the first adjacent sector. The transverse ribs located inside each sector are also tightly connected together with the separating transverse ribs by means of their internal butt ends and have a gap between their internal butt ends and longitudinal walls. Directly behind each of the separating transverse ribs on the side reverse to the one of charging, the plate is provided with slots screened by the ribs along their opposite longitudinal edge that are similar to the separating transverse ribs and by inclined walls as high as the transverse ribs on the internal butt ends. There is a slot made in the plate near the end reverse to the one of charging of the vibrator concentrator. The slot screened from the external side by a transverse vertical wall higher than the transverse ribs is for withdrawal of tails issuing over the rims of the separating transverse ribs the last from the charging side. The external ends of the last separating ribs of the vibrator concentrator are equipped with heads receptacles in a symmetric position to the longitudinal center line of the concentrating part and screened from the working side by the lateral inclined walls higher than the transverse ribs and equipped by an adjustable gap in the lower part near the plate surface.

EFFECT: more efficient gravity dressing, process specific capacity as well as improved conditions of separating mineral mixtures and continuous vibrodynamic withdrawal of high-density fractions and light fractions of a wide grain size range.

3 dwg

FIELD: mining engineering.

SUBSTANCE: invention relates to mineral dressing, namely, gravity dressing equipment. It can be used for extracting a valuable mineral from various granular materials. According to the invention, the vibrator concentrator has a concentration part with symmetrised transverse ribs divided into separate sectors by means of separating transverse ribs similar to the symmetrised transverse ribs, but with an inclination in a reflection similar position. In addition, the external butt ends of the separating transverse ribs are tightly connected with longitudinal walls by passages manufactured between their internal butt ends from sector to sector along the center line of the concentration part. A similar passage is also manufactured from the inlet box screened by the separating transverse ribs from the working side of the first adjacent sector. The transverse ribs located inside each sector are also tightly connected together with the separating transverse ribs by means of their internal butt ends and have a gap between their internal butt ends and longitudinal walls. Directly behind each of the separating transverse ribs on the side reverse to the one of charging, the plate is provided with slots screened by the ribs along their opposite longitudinal edge that are similar to the separating transverse ribs and by inclined walls as high as the transverse ribs on the internal butt ends. There is a slot made in the plate near the end reverse to the one of charging of the vibrator concentrator. The slot screened from the external side by a transverse vertical wall higher than the transverse ribs is for withdrawal of tails issuing over the rims of the separating transverse ribs the last from the charging side. The external ends of the last separating ribs of the vibrator concentrator are equipped with heads receptacles in a symmetric position to the longitudinal center line of the concentrating part and screened from the working side by the lateral inclined walls higher than the transverse ribs and equipped by an adjustable gap in the lower part near the plate surface.

EFFECT: more efficient gravity dressing, process specific capacity as well as improved conditions of separating mineral mixtures and continuous vibrodynamic withdrawal of high-density fractions and light fractions of a wide grain size range.

3 dwg

FIELD: process.

SUBSTANCE: classifier for milled refuses of polymer materials includes separation tank with conveying mechanism, filtration tank, irrigation tubes. Filtration tank is implemented as divided by high and low partitions for sections, at that on top ends of low partitions there are installed detachable screen-filters and in the last section of filtration tank it is installed pump and float valve. Conveying mechanism is implemented in the form of scraper chain with top and bottom scrapes stands. Chains are implemented with ability of displacement by bottom and top of tank. Irrigation tubes are installed on top of separation tank, and near by of its side wall it is mounted dischrge collector with cutouts, top discharge border of which is located lower the level of top scraper chain, with locking movable shutter and socket, directed to the first section of filtration tank.

EFFECT: separation effectiveness increase of separated melted refuses polymer materials of polymer particles, with absolutely different from basic material density, and dirt particles.

3 dwg, 1 ex

FIELD: processes; mining.

SUBSTANCE: screening method by density of fine unsized material with extraction of concentrate and tails includes classification and separation in centrifugal field. Unsized fine material is fed as pulp under pressure not less then 0.05 MPA into feeding device of centrifugal separator, implemented in the form of hydrocyclone. Sands of hydrocyclone are directed inside of conical rotating bowl, and discharge after blending with condensing water or compressed air, in the form of emulsion, is fed into accumulation zone and concentrate discharge. Feeding of these compounds depending on chosen mode can be implemented under pressure created by bowl rotation or by compressed air, permanently or pulsed and cyclical, with emulsion receiving and formation in accumulation area of semi-boiling medium of reduced viscosity and density. Method is implemented in centrifugal concentrator, including driver, bowl connected to hollow control shaft, body with circular section, facilities for charging and discharging of separation products, feeding of compressed air, condensing and wash water. Concentrator is outfitted by conglobated disk and mixing chamber, installed on the end of hollow driving shaft and connected to emptying fitting of feeder, implemented in the form of hydrocyclone with sand neck located inside of internal hollow shaft of discharging device, under which it is installed conglobated disk, rigidly bound to bowl and forming with it divided by blades ring channel, communicating to mixing chamber.

EFFECT: increasing of hard-cleaning heavy metals and minerals extraction and reduction of investment and operating costs.

4 cl, 2 dwg

FIELD: mining.

SUBSTANCE: vibration concentrator includes concentration element with symmetrical transverse ridges divided into separate sectors by transverse division ridges similar to symmetrical transverse ridges, but with mirrored sloping. Transverse division ridges are connected tightly by outer ends to lengthwise walls, and symmetrical transverse ridges inside each sector are connected tightly both to each other and to transverse division ridges by inner ends and feature gap in lower part between outer ends and lengthwise walls. Holes for tail outlet are made in a plate in each sector close to inner division ridge ends symmetrically to lengthwise axial line of vibration concentrator, are screened at work side by lateral sloping walls of height equal to transverse ridge height, and feature gaps with inner ends of transverse division ridges. Feed passes to each sector are made between tail outlet holes and screened by vertical walls higher than transverse ridges. Loading plate is mounted on a plate at loading end of vibration concentrator and screened from outside by transverse vertical wall higher than transverse ridges, and from inside by transverse division ridges with outlet in middle part to first concentration element sector from loading side. Outlet hole for tails passing through edges of last transverse division ridges from loading side is made in a plate at the vibration concentrator end opposite to loading end, and screened from outside by transverse vertical wall higher than transverse ridges. Concentrate collectors are mounted at outer ends of last division ridges symmetrically against lengthwise axial line of vibration concentrator, are screened at work side by sloping side walls higher than transverse ridges, and feature adjustable gap in lower part.

EFFECT: enhanced efficiency of gravitation treatment of minerals and specific efficiency of process.

2 cl, 2 dwg

FIELD: mining.

SUBSTANCE: vibration concentrator includes concentration element with symmetrical transverse ridges divided into separate sectors by transverse division ridges similar to symmetrical transverse ridges, but with mirrored sloping. Transverse division ridges are connected tightly by outer ends to lengthwise walls, and symmetrical transverse ridges inside each sector are connected tightly both to each other and to transverse division ridges by inner ends and feature gap in lower part between outer ends and lengthwise walls. Holes for tail outlet are made in a plate in each sector close to inner division ridge ends symmetrically to lengthwise axial line of vibration concentrator, are screened at work side by lateral sloping walls of height equal to transverse ridge height, and feature gaps with inner ends of transverse division ridges. Feed passes to each sector are made between tail outlet holes and screened by vertical walls higher than transverse ridges. Loading plate is mounted on a plate at loading end of vibration concentrator and screened from outside by transverse vertical wall higher than transverse ridges, and from inside by transverse division ridges with outlet in middle part to first concentration element sector from loading side. Outlet hole for tails passing through edges of last transverse division ridges from loading side is made in a plate at the vibration concentrator end opposite to loading end, and screened from outside by transverse vertical wall higher than transverse ridges. Concentrate collectors are mounted at outer ends of last division ridges symmetrically against lengthwise axial line of vibration concentrator, are screened at work side by sloping side walls higher than transverse ridges, and feature adjustable gap in lower part.

EFFECT: enhanced efficiency of gravitation treatment of minerals and specific efficiency of process.

2 cl, 2 dwg

FIELD: mining industry; devices for minerals dressing using a method of heavy minerals separation.

SUBSTANCE: the invention is pertinent to mining industry, in particular, to devices for minerals dressing using a method of heavy minerals separation. The heavy minerals cone separator includes a body, a drive, an airlift with a receiving box, a drainage sifter with a drain pan and a rabble. A zone of separation is partitioned from a stagnation zone by a ring-type cleaver-pusher. The cleaver-pusher is fixed on the rabble. The drain pan of the drainage sifter is supplied with a curvilinear launder. The launder is passing along the course of rotation of the rabble into the zone of separation. An internal wall of the body and the ring-type cleaver-pusher form the zone of separation. The diameter of the cleaver-pusher makes 0.2-0.4 of the diameter of the cylindrical part of the body. Depth of its immersing in suspension concerning to the level of overflow makes 0.3-0.5 m. The drainage sifter is displaced relatively to the axis of the rabble rotation and is installed under the receiving box of the outside airlift. The technical result is an increase and stabilization of a density of suspension in the zone of separation.

EFFECT: the invention ensures an increase and stabilization of a density of suspension in the zone of separation.

3 cl, 2 dwg, 1 ex

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