US3741530A - Apparatus for stirring and transporting slurries - Google Patents

Apparatus for stirring and transporting slurries Download PDF

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Publication number
US3741530A
US3741530A US00192629A US3741530DA US3741530A US 3741530 A US3741530 A US 3741530A US 00192629 A US00192629 A US 00192629A US 3741530D A US3741530D A US 3741530DA US 3741530 A US3741530 A US 3741530A
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US
United States
Prior art keywords
vessel
slurry
tube
stirring
conduit
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US00192629A
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English (en)
Inventor
C Stefanoiu
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
UZINA DE ALUMINA ORADEA
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UZINA DE ALUMINA ORADEA
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Filing date
Publication date
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Publication of US3741530A publication Critical patent/US3741530A/en
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    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
    • C01F7/00—Compounds of aluminium
    • C01F7/02—Aluminium oxide; Aluminium hydroxide; Aluminates
    • C01F7/04—Preparation of alkali metal aluminates; Aluminium oxide or hydroxide therefrom
    • C01F7/06—Preparation of alkali metal aluminates; Aluminium oxide or hydroxide therefrom by treating aluminous minerals or waste-like raw materials with alkali hydroxide, e.g. leaching of bauxite according to the Bayer process
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F27/00—Mixers with rotary stirring devices in fixed receptacles; Kneaders
    • B01F27/80—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a substantially vertical axis
    • B01F27/91—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a substantially vertical axis with propellers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
    • B65G53/00—Conveying materials in bulk through troughs, pipes or tubes by floating the materials or by flow of gas, liquid or foam
    • B65G53/30—Conveying materials in bulk through pipes or tubes by liquid pressure
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
    • C01F7/00—Compounds of aluminium
    • C01F7/02—Aluminium oxide; Aluminium hydroxide; Aluminates
    • C01F7/04—Preparation of alkali metal aluminates; Aluminium oxide or hydroxide therefrom
    • C01F7/14—Aluminium oxide or hydroxide from alkali metal aluminates
    • C01F7/144—Aluminium oxide or hydroxide from alkali metal aluminates from aqueous aluminate solutions by precipitation due to cooling, e.g. as part of the Bayer process
    • C01F7/147—Apparatus for precipitation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F27/00—Mixers with rotary stirring devices in fixed receptacles; Kneaders
    • B01F27/05—Stirrers
    • B01F27/11—Stirrers characterised by the configuration of the stirrers
    • B01F27/15—Stirrers with tubes for guiding the material

Definitions

  • the apparatus of the invention is adapted to replace, with greater economic efficiency, the generally previously-used pneumatic system for the stirring and transportation of slurries.
  • the present apparatus uses a tube centrally placed in the vessel; a turbine pump driven, for example, by an electric motor, is mounted in the tube. The turbine pump raises the slurry to the level of some apertures or windows in the tube.
  • the thus-raised slurry overflows through the windows to fall partly into the same vessel and partly into a conduit for transportation out of such vessel.
  • the conduit has windows through which the level of the slurry is maintained constant in the vessel.
  • the device provides an intensive stirring and the transportation of the slurry independent of the volume of the vessel and independent of the density of the slurry, with a much lower power consumption as compared to pneumatic stirring. Such intensive stirring eliminates the encrustation on the bottom of the vessels and on the side walls of the receiver.
  • the system of the invention also ensures the perfect vertical homogenization of the slurry, eliminating at the same time foaming and the eventual chemical reactions between the components of the slurry and those of air, and the consequent breaking down of the solid phase of the slurry.
  • SHEEI 1 If 2 APPARATUS FOR STIRRING AND TRANSPORTING SLURRIES This invention relates to an apparatus for the stirring and transportation of slurries in vessels of great volume, such as those used in the crystallization operation during the preparation of aluminum oxide.
  • the apparatus of the present invention for the stirring and transportation of slurries overcomes the above disadvantages of the described prior art devices.
  • a centrally disposed tube in which there is mounted a turbine pump driven by a motor.
  • the pump raises the slurry in the tube from the lower part of the vessel, and discharges it through some windows or apertures in the upper part of the tube, the apertures being so disposed that a part of the slurry returns to the same vessel and a part of the slurry flows into a conduit which delivers it outwardly of the vessel.
  • Such conduit may, if desired, lead'to the receiver of another similar vessel similarly equipped with slurry stirring and transporting means in accordance with the present invention.
  • FIG. 1 is a view in vertical longitudinal section through the apparatus of the invention
  • FIG. 2 is a view partially in longitudinal vertical section and partially in elevation of a system having two storage vessels in accordance with the invention connected in series;
  • FIG. 3 is a plan view of the system of FIG. 2.
  • FIG. I there is fragmentarily shown a vessel or receiver 2, the receiver 2 being the right hand receiver of the two-receiver system shown in FIGS.2 and 3.
  • the receiver 2 has the form more clearly shown in FIG. 2, that is, it has an upper elongated vertical circular cylindrical portion 19 and a lower, frusto-conical portion 20 mergingsmoothly therewith.
  • the portion'of the apparatus shown inFIG. l is disposed in the upper portion of the vessel or receiver 2.
  • a central tube I mounted at the top of receiver 2 has a flange 3 at the bottom thereof, such flange being connected to a similar flange 3a at the top ofa tube 4 which forms a prolongation of the tube 1 and extends centrally vertically downwardly to a point adjacent to but spaced from the bottom of the frusto-conical lower portion 20 of the receiver.
  • a turbine pump having helically disposed blades 5, such blades being mounted upon a central turbine pump shaft 6 which is supported in bearings 7 and 8 within an upper housing member which caps the upper end of the tube 1.
  • the turbine pump shaft is centrally guided by a bushing 9 which is mounted in the star or spider support 10 having slurry-conductingports therethrough.
  • the support 10 is affixed as by being welded to the inner wall of the tube 1 at generally the level of the flange 3 thereon.
  • the pump shaft 6 is driven by an electric motor 11 through a plurality of V-belts 12 entrained over a V- belt pulley 13 on the pump shaft and a confronting pul ley on the shaft of the motor.
  • the pump shaft 6 is driven in the direction indicated by the curved arrow in FIG. 1 so as to raise slurry which is admitted to the lower end of the tube 4 through windows D therein upwardly within the tube 4 thence through the ports in the support star of spider 9 and thence upwardly along the pump shaft within the tube 1.
  • a plurality of vertically disposed radial guide blades 14 are affixed to the inner wall of the tube 1 so as to guide the thus-raised slurry upwardly within the tube and to prevent any substantial rotation of the column of slurry in the tube above the turbine pump.
  • a part of the column of slurry thus raised by the pump is discharged through windows a in the upper end of the tube 1 so that it returns to the body of slurry within the vessel or receiver 2. The slurry is thus constantly stirred within the vessel.
  • a slurry-transporting conduit 16 Connected to the upper end of the tube 1 at one lateral position thereof there is a slurry-transporting conduit 16.
  • One or more windows b through the wall of the tube 1 provide communication between the interior of the tube and the conduit 16.
  • window b is disposed at or about the same level as window a.
  • the portion of the slurry which is not discharged through the window or windows a is thus discharged into the slurry-transporting conduit 16 through the window or windows b.
  • a window 0 in the side wall of the conduit 16 In order to maintain a constant level of slurry in the receiver or vessel 2, there is provided a window 0 in the side wall of the conduit 16. A portion of the slurry which is initially introduced into the conduit 16 thus flows outwardly through the window c and returns to the receiver 2.
  • the apparatus of the invention includes means whereby the stirring of the slurry by the turbine pump 5 may be temporarily replaced by compressed air agitation thereof as during the failure of the current supply for motor 11 of the device or during necessary repairs to the parts of the vessel including the pump, motor, and pump-driving means.
  • a main, compressed-air pipe 18 from which there branches a pipe 17' which is led downwardly within the receiver 2 to the lower end of the pipe 4 adjacent the level of a window or windows d in the lower end of the pipe 4, as shown in FIG. 2.
  • a selectively operable shutoff valve 17a is disposed in the pipe 17 as shown.
  • shut-off valve 17a When the shut-off valve 17a is opened, compressed air enters into the lower'end of the tube 4 thus elevating a column of slurry therein and causing the slurry to be continuously discharged through the window or windows a in the top of the tube 1. This prevents the settling of sediment in the bottom of the receiver or vessel 2, and the formation of encrustations on the inner surfaces and parts thereof.
  • H652 and 3 there is shown a system which is composed of two similar receivers connected in series; here the above-described receiver 2 discharges slurry through the conduits 16 into a second, similar receiver through the slurry-discharge conduit 16 of the receiver 2.
  • Parts of the receiver 15 which are similar to those of receiver 2 are designated by the same reference characters. Slurry is discharged from the second, left-hand receiver 15 through a conduit 16a either to a point of ultimate drying, packing, etc. or to a further receiver similar to the receivers 2 and 15.
  • the intense stirring of the slurry which is not dependent upon the volume of the receiver or upon the volume of the slurry therein, causes the solid phase of the slurry, which is laid down on the conical bottom of the receiver, to be absorbed within the slurry and to be recirculated therewith.
  • Encrustations, if any, which may temporarily form upon the side walls of the receiver are removed from the side walls of the receiver including those of the lower, frusto-conical portion thereof, upon the starting of the turbine pump.
  • the apparatus of the invention provides for the good, vertical homogenization of the slurry. eliminates the foaming thereof, and eliminates the eventual chemical reactions which might otherwise take place between the components of the slurry and air, particularly the oxygen therein.
  • the apparatus has a lower energy consumption, and is of simple,sturdy construction.
  • Apparatus for stirring and transporting slurries comprising a vessel adapted to contain a slurry, a vertical tube disposed generally centrally of the vessel, a pump in the tube below the surface of the slurry for continuously raising a column of slurry upwardly in the tube, a first aperture through the sidewall of the tube above the pump for returning a portion of the column of slurry to the main body of slurry within the vessel outwardly of the tube, a second aperture through the sidewall above the pump at generally the same level as the first aperture, and a slurry discharge conduit receiving slurry from the second aperture.
  • Apparatus according to claim 1 comprising a second vessel connected to the end of the conduit outwardly of the first-recited vessel to receive slurry therefrom, said second vessel being similar to the first recited vessel.
  • Apparatus according to claim 4 wherein the upper portion of the vessel is in the form of a vertically disposed circular cylinder, such circular cylinder forming a predominant part of the height of the vessel, and the lower portion of the vessel is of generally conical shape and is disposed coaxially of the upper portion of the vessel.
  • Apparatus according to claim 1 wherein the pump is a turbine pump having an impeller with helical blades mounted on a vertical pump shaft disposed centrally of thetube.

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  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Inorganic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Mixers Of The Rotary Stirring Type (AREA)
US00192629A 1970-10-23 1971-10-26 Apparatus for stirring and transporting slurries Expired - Lifetime US3741530A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
RO6477070 1970-10-23

Publications (1)

Publication Number Publication Date
US3741530A true US3741530A (en) 1973-06-26

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Application Number Title Priority Date Filing Date
US00192629A Expired - Lifetime US3741530A (en) 1970-10-23 1971-10-26 Apparatus for stirring and transporting slurries

Country Status (4)

Country Link
US (1) US3741530A (https=)
BE (1) BE780007A (https=)
DE (1) DE2146936A1 (https=)
FR (1) FR2110963A5 (https=)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009152570A1 (en) * 2008-06-17 2009-12-23 Rio Tinto Aluminium Limited Flash tanks
EP2388065A3 (en) * 2010-04-26 2012-03-28 SPX Corporation Mixer flow direction apparatus and method

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH360268A (de) * 1956-12-10 1962-02-15 Wilhelm Lang Kg Mischmaschine für Trockenstoffe

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH360268A (de) * 1956-12-10 1962-02-15 Wilhelm Lang Kg Mischmaschine für Trockenstoffe

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009152570A1 (en) * 2008-06-17 2009-12-23 Rio Tinto Aluminium Limited Flash tanks
US20110199854A1 (en) * 2008-06-17 2011-08-18 Christopher Gordon Coleman Flash tanks
CN102186580A (zh) * 2008-06-17 2011-09-14 里奥迪图铝业有限公司 闪蒸槽
RU2506995C2 (ru) * 2008-06-17 2014-02-20 Рио Тинто Алюминиум Лимитед Емкости быстрого охлаждения
AU2009260114B2 (en) * 2008-06-17 2014-07-03 Rio Tinto Aluminium Limited Flash tanks
EP2388065A3 (en) * 2010-04-26 2012-03-28 SPX Corporation Mixer flow direction apparatus and method

Also Published As

Publication number Publication date
FR2110963A5 (https=) 1972-06-02
DE2146936A1 (de) 1972-04-27
BE780007A (fr) 1972-06-16

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