US3722869A - Segregation apparatus - Google Patents

Segregation apparatus Download PDF

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Publication number
US3722869A
US3722869A US00037336A US3722869DA US3722869A US 3722869 A US3722869 A US 3722869A US 00037336 A US00037336 A US 00037336A US 3722869D A US3722869D A US 3722869DA US 3722869 A US3722869 A US 3722869A
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United States
Prior art keywords
chamber
rate
valve
discharge
level
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
US00037336A
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English (en)
Inventor
V Moore
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Crucible SA
Original Assignee
Anglo American Corp of South Africa Pty Ltd
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Assigned to CRUCIBLE SOCIETE ANONYME, reassignment CRUCIBLE SOCIETE ANONYME, ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: ANGLO AMERICAN CORPORATION OF SOUTH AFRICA LIMITED
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    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B1/00—Preliminary treatment of ores or scrap
    • C22B1/02—Roasting processes
    • C22B1/08—Chloridising roasting

Definitions

  • This invention relates to improvements in segrega tion apparatus.
  • Segregation of particulate materials has been known for many years in connection with the recovery of copper. It has now been demonstrated that metals other than copper can also be caused to segregate by a choice of suitable conditions.
  • the present invention is applicable to the segregation process regardless of the metal to which it is applied.
  • plug flow is achieved by causing the heated ore to flow in a vertical column and the discharge from the column is controlled by some form of continuous discharge valve. In practice star valves have been found to be suitable.
  • a new type of sleeve valve has also been found to be satisfactory for achieving continuous discharge.
  • the invention provides the improvement of causing the level of the solids in the chamber to oscillate between predetermined levels.
  • Oscillation may be achieved by regulating the discharge from the chamber.
  • the rate of discharge may be varied between a low value (which may be zero) lower than the rate of feed to the chamber and a high value higher than the rate of feed to the chamber.
  • FIG. 1 is a diagrammatic section through an installation operating on the principles disclosed in the above identified patent application, now abandoned.
  • FIG. 2 is a side view of part of FIG. 1,
  • FIG. 3 is a view similar to FIG. 2 of a variation of the invention.
  • FIG. 4 is again a view similar to FIG. 2 of another variation.
  • FIG. 1 ore is fed to a fluidized reactor bed 3 and overflows over a lip 2 into a segregation chamber 4. Solids entrained by the fluidizing gas are recovered in cyclones 5 and 6 and returned to the chamber 4. Reagents, coal and salt, are added to the chamber 4 through the down leg of the cyclone 6.
  • the chamber 4 is a vertical cylindrical vessel having an inverted conical base 7 terminating in a star valve 8. Above the valve 8 there may be a system of baffles 9.
  • valve 8 discharges into a quench tank (not shown) and the product is treated for the recovery of segregated metal in any suitable way, e.g., by flotation.
  • FIG. 2 there are two pressure probes l0 and 11 (also seen in FIG. 1) spaced apart at a suitable distance.
  • outputs of the probes l0 and 11 are fed to a control device 12 which in turn controls a magnetic clutch 13 which drives the valve 8 through a shaft 17.
  • the clutch 13 is driven from a motor 14 through a suitable gear box 15.
  • the control device 12 is arranged to energize the clutch 13 when a signal from the probe 10 indicates the presence of material at the level of the probe.
  • the valve 8 will rotate and discharge material from the chamber 4.
  • the clutch is de-energized and the valve 8 stops rotation.
  • valve 8 was run at 18 r.p.m., was stopped for 60 respect to the signals from the pressure probes 10 and An alternative to FIG. 2 is illustrated in FIG. 3.
  • the probes 10 and 11 feed signals to a control device 12 which controls a speed control device 16 which controls the the motor 14 between two alternate speeds. If the probe signals the presence of material at its level, the speed of the motor 14 is set at the higher of the two alternate speeds. As soon as the probe 11 signals the absence of material at its level, the motor 14 is switched to the lower speed.
  • the higher speed is chosen to cause the valve 8 to discharge material faster than the rate of overflow from the reactor bed 3 and the lower speed to discharge material slower than the overflow.
  • discharge from the chamber 4 was achieved by means of a sleeve valve 18.
  • the valve 18 is caused to open and close by a double acting pneumatic cylinder 20, acting on a lever 19 connected to the valve 18.
  • the control device 12 opens and closes valves 21 and 22. If the probe it) signals the presence of material the valve 21 is opened and the lever 19 is pushed to open the valve 18. At the same time the valve 22 is set to exhaust air from the other side of the cylinder 20. A signal from the probe 11 that material is absent at its level causes the valve 21 to be turned to exhaust and the valve 22 to be turned on for the lever 19 to be pushed in a direction causing the valve 18 to close.
  • valve 18 In operation with the embodiment of FIG. 4 the valve 18 has always been caused to close entirely when the probe 11 gave its signal. In the event segregation percentages of 95 percent and better were obtained. It is, of course, possible to move the valve 18 to close only to an extent necessary to cause the rate of discharge to be lower than the rate of overflow into the chamber 4.
  • valve 18 was open for about 12 seconds and closed for about seconds at a time.
  • apparatus for the segregation of particulate material comprising a fluidized bed heater, a segregation chamber into which heated material overflows from the fluidized bed, a discharge at the foot of the chamber and means to feed reagents to the chamber; the improvement comprising a discharge valve at the foot of the chamber adapted to operate so as to vary the rate of discharge between a first rate that is higher than the rate of overflow into the chamber and a second rate which is lower than the rate of overflow, a first detector at a high level in the chamber for detecting the presence of material at that level, a second detector at a low level in the chamber of detecting the absence of material at that level, and control means responsive to the detectors arranged to control the operation of the discharge valve, the control means being responsive to the first detector to cause the valve to cause discharge at the first rate and being responsive to the second detector to cause the valve to cause discharge at the second rate.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Geology (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Environmental & Geological Engineering (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Manufacture And Refinement Of Metals (AREA)
  • Devices And Processes Conducted In The Presence Of Fluids And Solid Particles (AREA)
US00037336A 1966-09-28 1970-05-14 Segregation apparatus Expired - Lifetime US3722869A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
ZA665859 1966-09-28

Publications (1)

Publication Number Publication Date
US3722869A true US3722869A (en) 1973-03-27

Family

ID=25561020

Family Applications (1)

Application Number Title Priority Date Filing Date
US00037336A Expired - Lifetime US3722869A (en) 1966-09-28 1970-05-14 Segregation apparatus

Country Status (8)

Country Link
US (1) US3722869A (fr)
JP (1) JPS4925082B1 (fr)
BR (1) BR6793344D0 (fr)
ES (1) ES345483A1 (fr)
FR (1) FR1573839A (fr)
GB (1) GB1170360A (fr)
IL (1) IL28679A (fr)
OA (1) OA02667A (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4119303A (en) * 1974-12-06 1978-10-10 Klockner-Humboldt-Deutz Aktiengesellschaft Method and device for precipitating copper cement from a copper solution mixed with iron
US4380328A (en) * 1979-01-29 1983-04-19 Kobe Steel, Ltd. Shaft furnace for reducing ores
US4507079A (en) * 1982-05-18 1985-03-26 Voest-Alpine Aktiengesellschaft Apparatus for discharging solids from a shaft furnace

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4119303A (en) * 1974-12-06 1978-10-10 Klockner-Humboldt-Deutz Aktiengesellschaft Method and device for precipitating copper cement from a copper solution mixed with iron
US4380328A (en) * 1979-01-29 1983-04-19 Kobe Steel, Ltd. Shaft furnace for reducing ores
US4507079A (en) * 1982-05-18 1985-03-26 Voest-Alpine Aktiengesellschaft Apparatus for discharging solids from a shaft furnace

Also Published As

Publication number Publication date
FR1573839A (fr) 1969-07-11
ES345483A1 (es) 1968-11-01
BR6793344D0 (pt) 1973-06-14
JPS4925082B1 (fr) 1974-06-27
IL28679A (en) 1971-04-28
OA02667A (fr) 1970-12-15
GB1170360A (en) 1969-11-12

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Owner name: CRUCIBLE SOCIETE ANONYME, 14 RUE ALDRINGEN, LUXEMB

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Effective date: 19850327

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