Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
  • B03D—FLOTATION; DIFFERENTIAL SEDIMENTATION
  • B03D1/00—Flotation
  • B03D1/14—Flotation machines
  • B03D1/24—Pneumatic
  • B03D1/247—Mixing gas and slurry in a device separate from the flotation tank, i.e. reactor-separator type
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
  • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
  • B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
  • B01F25/30—Injector mixers
  • B01F25/31—Injector mixers in conduits or tubes through which the main component flows
  • B01F25/314—Injector mixers in conduits or tubes through which the main component flows wherein additional components are introduced at the circumference of the conduit

Definitions

• the invention relates to a device for gassing a liquid-solid suspension to be flourished for the purpose of carrying out a pneumatic flotation.
• gas bubbles are generated by a gassing device, which, under certain conditions, specifically attach to certain solids.
• gas-bubble-solid complexes are formed in the suspension, which are then separated off as foam in a separation vessel after leaving the gassing device.
• a special design of the gassing device can influence the number and the size of the gas bubbles generated and thus the accumulation of the gas bubbles on the solids to be discharged.
• the gas bubbles can be generated in different ways.
• DE 24 20 482 describes a gassing device for flotation plants, comprising a gassing chamber in which the suspension is passed through a sieve and then brought into contact with air, wherein sieves with different hole diameters (5 to 40 ⁇ m) can be used.
• the gas supply line is closed with a metal frit through which the air exits in the form of gas bubbles.
• the maximum pore size of the metal frit is specified as 10 to 150 ⁇ m.
• ORIGINAL DOCUMENTS flows perpendicular to the lamella surface, the gas passing into the liquid between adjacent lamellae.
• the gaps between the lamellae are 10 to 500 ⁇ m, preferably 25 ⁇ m.
• the suspension stream entering a device is separated into several partial suspension streams. While after the Known methods of DE 31 40 966 separate the generated partial streams from each other in the separating vessel, impacting the suspension surface, thereby introducing air in the form of bubbles into the suspension, the separation of the separated partial streams according to the invention is already found in the loading - Gasungsvo ⁇ chtung instead, in such a way that all partial beams collide at a common point within the fumigation device.
• the suspension container in which the foam formed by the gassing is separated, and the gassing device are therefore spatially separated from one another, so that a separate optimization of the gassing process is possible without simultaneously adversely affecting the separation process in the separation vessel influence.
• the inventive collision of the previously separated partial jets at one point not only advantageously introduces the gas into the suspension, but at the same time a particularly optimal attachment of the gas bubbles to the solid particles to be discharged is achieved.
• the size of the gas bubbles, their distribution and their attachment to the solids to be discharged can be changed by changing the location of the "impact point", which is freely selectable by changing the angle that the partial beams form to the central axis of the gassing device Change the design of the lower part of the gassing device, a flow pipe in which this impact point is located, in a simple manner and thus optimize it, without adversely affecting the separation process, which takes place in a separation vessel that is locally separated from the gassing device.
• the change in the angle of the partial jets and the change in the shape of the lower flow tube can be carried out according to the invention in a simple manner by exchanging the nozzle plate which generates the partial jets and the lower flow tube by a flow tube of a different shape.
• the gassing device (10) consists of several sections (18, 14, 19, 20) which are detachably connected to one another in a modular manner.
• the upper part (18) is tubular and is closed at the bottom with a nozzle plate (14).
• Nozzles (15) are arranged in the nozzle plate (14), the axes of which are aligned so that they converge so that they meet at a point (P).
• the nozzles (15) can be arranged in a circle around the central axis (13) of the gassing device (10), so that the nozzle axes each form the same acute angle ( ⁇ ) with the central axis (13). However, they can also be arranged in several circles around the central axis (13), so that the nozzle axes arranged here form a different fixed acute angle with the central axis (13) for each circle.
• a housing (19) which surrounds the fumigation space (16) and has lateral openings (17) which lead from the outside into the fumigation space (16) is arranged below the nozzle plate (14).
• Pipe section (18), nozzle plate (14) and housing (19) are detachably connected to one another, the connection being made, for example by a screw connection (23), so that the nozzle plate can be replaced in a simple manner.
• a flow tube (20) is inserted into the housing (19) from below, whereby the fumigation space (16) is extended downwards and in which point (P) is then located.
• the housing (19) and flow tube (20) are also detachably connected to one another in order to make it easy to replace the flow tube (20).
• the flow tube (20) can have a thread on the outside at its upper end, so that the flow tube (20) can be screwed into a corresponding thread on the inside in the housing (19).
• the suspension to be gassed is conveyed by a pump device (not shown in the drawing) with high pressure as a suspension stream (11) into the tubular upper part (18) of the gassing device (10) and through the nozzles (15 ) the nozzle part (14) closing the upper part (18).
• the suspension stream (11) is thereby separated into partial streams (12), the flow direction of which corresponds to the direction of the nozzle axes and, like these, are arranged so as to converge with one another.
• the gassing can be influenced in the desired manner.
• a further favorable influence on the gassing process can be found by regulating the pressure and the amount of the suspension flowing into the gassing device and by limiting or increasing (by means of an additional pump) the amount of gas flowing into the gassing space (16) ⁇ practice.
• the arrangement of flow bodies in the free space inside the gassing device above and / or below the nozzle plate (14) can also advantageously have a favorable influence on the gassing process.
• the entire gassing Solution device (10) is assembled in a modular manner, as a result of which parts damaged by wear can be replaced in a simple and quick manner.
• these can also be made of a wear-resistant material, for example a hard metal or a ceramic material (e.g. Silicon carbide). This applies in particular to the baffle plate (14), which is particularly exposed to wear and whose manufacture from a special wear-resistant material should not cause any great difficulties.
• a wear-resistant material for example a hard metal or a ceramic material (e.g. Silicon carbide).

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• Chemical & Material Sciences (AREA)
• Chemical Kinetics & Catalysis (AREA)
• Life Sciences & Earth Sciences (AREA)
• Engineering & Computer Science (AREA)
• Biotechnology (AREA)
• Physical Or Chemical Processes And Apparatus (AREA)
• Silicon Compounds (AREA)
• Catching Or Destruction (AREA)
• Apparatus For Disinfection Or Sterilisation (AREA)
• Micro-Organisms Or Cultivation Processes Thereof (AREA)
• Fluid-Damping Devices (AREA)
• Paper (AREA)

Applications Claiming Priority (3)

Publications (2)

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ID=6516296

Family Applications (1)

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Cited By (1)

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• 1994
  • 1994-04-23 DE DE4414272A patent/DE4414272A1/de not_active Withdrawn
• 1995
  • 1995-04-20 WO PCT/EP1995/001489 patent/WO1995029012A1/fr not_active Ceased
  • 1995-04-20 BR BR9507501A patent/BR9507501A/pt not_active IP Right Cessation
  • 1995-04-20 EP EP95917943A patent/EP0757591B1/fr not_active Expired - Lifetime
  • 1995-04-20 AT AT95917943T patent/ATE183950T1/de not_active IP Right Cessation
  • 1995-04-20 DE DE59506733T patent/DE59506733D1/de not_active Expired - Lifetime
  • 1995-04-21 ZA ZA953265A patent/ZA953265B/xx unknown

Non-Patent Citations (1)

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