CA1097827A - Process and apparatus for the flotation of mineral raw materials - Google Patents
Process and apparatus for the flotation of mineral raw materialsInfo
- Publication number
- CA1097827A CA1097827A CA293,351A CA293351A CA1097827A CA 1097827 A CA1097827 A CA 1097827A CA 293351 A CA293351 A CA 293351A CA 1097827 A CA1097827 A CA 1097827A
- Authority
- CA
- Canada
- Prior art keywords
- flotation
- air
- floatation
- intermittent
- raw materials
- 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
Links
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
- B03D1/02—Froth-flotation processes
- B03D1/04—Froth-flotation processes by varying ambient atmospheric pressure
-
- 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
- B03D1/02—Froth-flotation processes
- B03D1/028—Control and monitoring of flotation processes; computer models therefor
-
- 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
- B03D1/1406—Flotation machines with special arrangement of a plurality of flotation cells, e.g. positioning a flotation cell inside another
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Biotechnology (AREA)
- Manufacture And Refinement Of Metals (AREA)
- Physical Water Treatments (AREA)
- Physical Or Chemical Processes And Apparatus (AREA)
- Paper (AREA)
- Treatment Of Sludge (AREA)
- Mixers Of The Rotary Stirring Type (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
The present invention provides a method of treating mineral raw materials by a foam flotation process wherein the raw materials are admitted into flotation cells with flotation reagents, and an intermittent pulsating supply of air is fed to said flotation cells.
The present invention provides a method of treating mineral raw materials by a foam flotation process wherein the raw materials are admitted into flotation cells with flotation reagents, and an intermittent pulsating supply of air is fed to said flotation cells.
Description
10C'78Z7 The invention relates -to a process and an apparatus for treating ores, coal, non-metallic mineral resources and other mineral raw materials by foam flotation.
In many deposits the ore content of the mined material decreases as the workinq of the mines progresses over the years.
Moreover, the interest in available large deposits of poor-grade ores also increases to an increasing extent since the demand for an increased recovery of metals is growing.
Thus, the need for an increased capacity of separating plants is genuine. ~igh throughputs are also desirable in the working of rich ore deposits.
In known flotation processes with self-breathing admission of air and independent aeration of the flotation apparatus, the amount of air supplied during the flotation process is constant. Such ]cnown flotation processes are described in the following puhlications:
Schuhert H., Aufbereitung fester mineralischer Rohstoffe, Vol. 1,2,3, VEB Deutscher Verlag fur Grundstoffindustrie, Leipzig, 23rd edition 1967, 1974 Gaudin A., Flotation, Second Edition, McGraw-Hill Book Company, New York Grinder W., Aufbereitunqskunde, ~lermann Hubnier Verlag 1965, Goslar Mitrofanov S., Selektivnaja Flotacija, Nedra, ~loscow 1967 Sutherland K.
and Nark I. Principles of Flotation, Melbourne - Spravocnik po obagasceniju rud, Moscow 1972, Vol.
1,2,3,4 10~782~
.
- Klassen V., Mokrousov; Uvedenie v teorijer flotacii, Moscow 1959 Plaksin I., Glembocki~; Klassen V., Flotacija, Moscow 1971 Glembockij; ~lassen V., Flotacija~ Moscow 1973 The known flotation apparatus comprises several series connected mechanical agitator vessels and auxiliary devices (reagent-dosing devices and reaction vessels). The flotation pulp flows through the cells in the same direction and is a three-phase system (solid-liquid-gaseous) during the entire flotation process. ' .
The disadvantages of this method of foam flotation with constant admission of air are as follows:
- low pulp density (only ~0 to 40~ oF the solid content) - ui~satisractory 10tation of the coarse L,articles - h1gh power consumptlon per ~on o~ ~nrougnput ~ relatively high amount of reagent required per ton of throughput - large investment reguired per ton of throughput.
The object of the present invention is to utilize the flotation apparatus for mineral raw minerals more effectively, to save on investment to a great extent and to strengthen the raw material basis.
It is an object of the invention to obtain a process and an apparatus for the flotation of mineral raw materials by means of which it is possihle to increase the amount of solids without extending the time of flotation. The flotation of the solid constituents is to be improved while the energy requirement and the consumption of reagents are reduced.
According to the invention this aim is achieved in that the flotation process is carried out with intermittent supply of air. The flotation time comprises a periodic alternation of normal supply of air and blocked admission of air. When supply-
In many deposits the ore content of the mined material decreases as the workinq of the mines progresses over the years.
Moreover, the interest in available large deposits of poor-grade ores also increases to an increasing extent since the demand for an increased recovery of metals is growing.
Thus, the need for an increased capacity of separating plants is genuine. ~igh throughputs are also desirable in the working of rich ore deposits.
In known flotation processes with self-breathing admission of air and independent aeration of the flotation apparatus, the amount of air supplied during the flotation process is constant. Such ]cnown flotation processes are described in the following puhlications:
Schuhert H., Aufbereitung fester mineralischer Rohstoffe, Vol. 1,2,3, VEB Deutscher Verlag fur Grundstoffindustrie, Leipzig, 23rd edition 1967, 1974 Gaudin A., Flotation, Second Edition, McGraw-Hill Book Company, New York Grinder W., Aufbereitunqskunde, ~lermann Hubnier Verlag 1965, Goslar Mitrofanov S., Selektivnaja Flotacija, Nedra, ~loscow 1967 Sutherland K.
and Nark I. Principles of Flotation, Melbourne - Spravocnik po obagasceniju rud, Moscow 1972, Vol.
1,2,3,4 10~782~
.
- Klassen V., Mokrousov; Uvedenie v teorijer flotacii, Moscow 1959 Plaksin I., Glembocki~; Klassen V., Flotacija, Moscow 1971 Glembockij; ~lassen V., Flotacija~ Moscow 1973 The known flotation apparatus comprises several series connected mechanical agitator vessels and auxiliary devices (reagent-dosing devices and reaction vessels). The flotation pulp flows through the cells in the same direction and is a three-phase system (solid-liquid-gaseous) during the entire flotation process. ' .
The disadvantages of this method of foam flotation with constant admission of air are as follows:
- low pulp density (only ~0 to 40~ oF the solid content) - ui~satisractory 10tation of the coarse L,articles - h1gh power consumptlon per ~on o~ ~nrougnput ~ relatively high amount of reagent required per ton of throughput - large investment reguired per ton of throughput.
The object of the present invention is to utilize the flotation apparatus for mineral raw minerals more effectively, to save on investment to a great extent and to strengthen the raw material basis.
It is an object of the invention to obtain a process and an apparatus for the flotation of mineral raw materials by means of which it is possihle to increase the amount of solids without extending the time of flotation. The flotation of the solid constituents is to be improved while the energy requirement and the consumption of reagents are reduced.
According to the invention this aim is achieved in that the flotation process is carried out with intermittent supply of air. The flotation time comprises a periodic alternation of normal supply of air and blocked admission of air. When supply-
- 2 -,, .
ing air the latter is dispersed by the agitator system, i,e., a three-phase mixture i5 formed. The supply of air is necessary for the flotation process, but it interferes with the dispersion of the solids. The amount of solids in the pulp is thus limited.
As soon as the air is absent a two-phase system results in which the dispersion of the solids is distinctly improved.
The hydro-dynamics oE the process is greatly changed and the circulation in the flotation apparatus is assured even at twice the pulp density.
When air is supplied again a portion of the material floats due to the contact between solid particles and air bubbles.
Without this intermittent air supply no flotation would be possibl, at a pulp density higher than normal under standard flotation conditions, i.e., with adequate but constant addition of air, since the indiviclual cells of the flotation battery would be silted up very rapidly due to insufficient fluidization of the solid particles. The intermittent addition of air is brought about by installing a shut off member in the air intake. Said shut off member is operated with the aid of a control device according to a presupposed pulsation characteristic, which is a function of the raw material.
This pulsating supply of air permits a successful flotation while the pulp density is increased to values of 1.5 times to twice the usual pulp density.
The invention will be described in more detail, by way of example only, with reference to the accompanying drawings, in which:
Figure 1 shows an apparatus for carrying out the process with independent aeration;
Figure 2 shows an apparatus without additional air; and Figure 3 is a diagram showing the power absorption plotted against pulp density under different conditions, .-" 10~78Z7 Firstly, a practical example of the invention will be considered.
The process is carried out in the following manner:
The pulp which is provided with a correspondingly high amount of solids is fed to a flotation machine in the usual way, whereupon the corresponding flotation reagents are added. The air for the flotation, in the form of a pulsating air flow, is admitted into the flotation cells by way of a controlling valve. The process was confirmed by experiments on a feldspar-quartz raw material and on a hearth mixed concentrate of tin and arsenical pyrites. It became evident that with identical flotation time and identical result of treatment, the pulp density was 1.5 times to twice as high while the consumption of reagents was 1.5 times lower. However, the solid particles getting into the concentrate are much coarser than those in the standard foam flotation. In a further development of the process the operation is so carried out that periods of normal air supply alternate with periods of greatly reduced air supply.
These experimental technological results are shown in the Table with intermittent air supply.
The experimental data of the power absorption in a 100-litre flotation cell are evident from the diaqram (Figure 3) in which the curves 4 and 5 represent the power absorption at 6000 litres h 1 and 12000 litres h 1 respectively with constant air supply and at varying speed corresponding to the requirement that the solids are not yet sufficiently dispersed.
Curve 3 shows the power requirement without the supply of air at constant speed. However, this speed was sufficient for dispersing the solids even at high pulp density. The curves 1 and 2 show the greatly reduced power consumption with inter-mittent air supply and at constant speed, as in curve 3 during the flotation (curve 1 = 12000 litres h 1, curve 2 = 6000 ~097827 litres ~ h 1).
The process stood the test in the flotation machines described hereafter with reference to Figures 1 and 2.
According to Figure 1 the flotation machine 1 is fitted with a shut off or reducing valve 2 for the central air intake 3 with time-control unit 4 and a compressor 5. In flotation machines with self-breathing admission of air without additional air the process is applicable in a like manner (Fig. 2). The central air intake must be sealed and a shut off or reducing valve, which assures the intermittent air supply by means of a time-control unit,must be attached to the corres-ponding intake stack of the flotation cells.
l~g7827 ' ~ ` ~ o ~ ~ ~ ~ co 0~ ~ ~ ~
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.~ ~ ~ ~ ~ ~ O ~ ~ t~
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~ii 'I ~ ~. ~: ~ ~ X
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~ ~ O ~ O O ~ ~ ~ fi~ ~ O 8 N
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~, ., X X
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.,, ,~ .,, o ~ ~ ~ 3 ~ ~o ~ ~
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~ ~ U~ ,, ,` o o o ~o ~ ~ CO CO ~ o o o a, ~ u, u~ ~r
ing air the latter is dispersed by the agitator system, i,e., a three-phase mixture i5 formed. The supply of air is necessary for the flotation process, but it interferes with the dispersion of the solids. The amount of solids in the pulp is thus limited.
As soon as the air is absent a two-phase system results in which the dispersion of the solids is distinctly improved.
The hydro-dynamics oE the process is greatly changed and the circulation in the flotation apparatus is assured even at twice the pulp density.
When air is supplied again a portion of the material floats due to the contact between solid particles and air bubbles.
Without this intermittent air supply no flotation would be possibl, at a pulp density higher than normal under standard flotation conditions, i.e., with adequate but constant addition of air, since the indiviclual cells of the flotation battery would be silted up very rapidly due to insufficient fluidization of the solid particles. The intermittent addition of air is brought about by installing a shut off member in the air intake. Said shut off member is operated with the aid of a control device according to a presupposed pulsation characteristic, which is a function of the raw material.
This pulsating supply of air permits a successful flotation while the pulp density is increased to values of 1.5 times to twice the usual pulp density.
The invention will be described in more detail, by way of example only, with reference to the accompanying drawings, in which:
Figure 1 shows an apparatus for carrying out the process with independent aeration;
Figure 2 shows an apparatus without additional air; and Figure 3 is a diagram showing the power absorption plotted against pulp density under different conditions, .-" 10~78Z7 Firstly, a practical example of the invention will be considered.
The process is carried out in the following manner:
The pulp which is provided with a correspondingly high amount of solids is fed to a flotation machine in the usual way, whereupon the corresponding flotation reagents are added. The air for the flotation, in the form of a pulsating air flow, is admitted into the flotation cells by way of a controlling valve. The process was confirmed by experiments on a feldspar-quartz raw material and on a hearth mixed concentrate of tin and arsenical pyrites. It became evident that with identical flotation time and identical result of treatment, the pulp density was 1.5 times to twice as high while the consumption of reagents was 1.5 times lower. However, the solid particles getting into the concentrate are much coarser than those in the standard foam flotation. In a further development of the process the operation is so carried out that periods of normal air supply alternate with periods of greatly reduced air supply.
These experimental technological results are shown in the Table with intermittent air supply.
The experimental data of the power absorption in a 100-litre flotation cell are evident from the diaqram (Figure 3) in which the curves 4 and 5 represent the power absorption at 6000 litres h 1 and 12000 litres h 1 respectively with constant air supply and at varying speed corresponding to the requirement that the solids are not yet sufficiently dispersed.
Curve 3 shows the power requirement without the supply of air at constant speed. However, this speed was sufficient for dispersing the solids even at high pulp density. The curves 1 and 2 show the greatly reduced power consumption with inter-mittent air supply and at constant speed, as in curve 3 during the flotation (curve 1 = 12000 litres h 1, curve 2 = 6000 ~097827 litres ~ h 1).
The process stood the test in the flotation machines described hereafter with reference to Figures 1 and 2.
According to Figure 1 the flotation machine 1 is fitted with a shut off or reducing valve 2 for the central air intake 3 with time-control unit 4 and a compressor 5. In flotation machines with self-breathing admission of air without additional air the process is applicable in a like manner (Fig. 2). The central air intake must be sealed and a shut off or reducing valve, which assures the intermittent air supply by means of a time-control unit,must be attached to the corres-ponding intake stack of the flotation cells.
l~g7827 ' ~ ` ~ o ~ ~ ~ ~ co 0~ ~ ~ ~
o ~ ~ ~ ~p a ~ 0 0 0 O ~
.~ ~ ~ ~ ~ ~ O ~ ~ t~
r~ U~ U) I~ I` ~ ~ ~ ~ ~ .p ~ ~D
o a.l ~ o ~ O a~ r U ~ 1 K ~ ~ ` u~ ~
~ii 'I ~ ~. ~: ~ ~ X
~ .. o\ ~ l ~;
~ co~ ~ a~ .~
u~ ~ o~ ~ ~ ~ ~ ~
,~ ~ o~P u~ a~ o ,i o~ u~ n ~ ~ ~ .~
æ ~ ~ ~ ~ ~ u ~P
~ ~ O ~ O O ~ ~ ~ fi~ ~ O 8 N
~ ~ P ~ o ~ ~ ~8 ~
~, ., X X
U~ ~ ~ U~ Ul ~ ~ ~ ~ 8 ~ 8 ~ ~
.,, ,~ .,, o ~ ~ ~ 3 ~ ~o ~ ~
~ ~ ~ U~ ~ ~ ~
~ ~ U~ ,, ,` o o o ~o ~ ~ CO CO ~ o o o a, ~ u, u~ ~r
Claims (3)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A process for the treatment of mineral raw materials in foam-floatation process, characterized in that the raw mater-ials together with the floatation reagents are introduced into a floatation cell this being followed by the intermittent introduc-tion of air into the floatation cell, the introduction of air being either completely interrupted or greatly reduced to provide said intermittent introduction.
2. A process according to claim 1, characterized in that the floatation in the floatation cell is effected by the introduction of atmospheric air or by self-induction the intro-duction of the air being controlled so as to be intermittent.
3. An apparatus for conducting the floatation process according to claim 1 or 2, in a floatation cell characterized in that cut-off or reducer elements are present in an air feed line through which an air feed into the floatation cell takes place by means of control elements in a characteristic manner that is dependent on the raw material.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DDWPBO3D/196473 | 1976-12-20 | ||
| DD19647376A DD146738A3 (en) | 1976-12-20 | 1976-12-20 | METHOD FOR FLOTING MINERAL RAW MATERIALS |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1097827A true CA1097827A (en) | 1981-03-17 |
Family
ID=5506758
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA293,351A Expired CA1097827A (en) | 1976-12-20 | 1977-12-19 | Process and apparatus for the flotation of mineral raw materials |
Country Status (8)
| Country | Link |
|---|---|
| CA (1) | CA1097827A (en) |
| DD (1) | DD146738A3 (en) |
| DE (1) | DE2751809C2 (en) |
| FI (1) | FI65390C (en) |
| FR (1) | FR2374090A1 (en) |
| GB (1) | GB1594500A (en) |
| IT (1) | IT1093046B (en) |
| SE (1) | SE7714284L (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115921129B (en) * | 2023-01-31 | 2023-12-29 | 中铝青岛轻金属有限公司 | Waste metal flotation equipment |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2055951C3 (en) * | 1970-11-13 | 1973-10-18 | Wsesojusny Nautschno-Issledowatelskij I Proektnyj Institut Mechanitscheskoj Obrabotki Polesnych Iskopaemych Mechanobr, Leningrad (Sowjetunion) | Stirrers for flotation cells |
| FR2116262A1 (en) * | 1970-12-02 | 1972-07-13 | Inst Mekh | Flotation cell - with shaker-stirrer fitted with one way air and liquid passages |
-
1976
- 1976-12-20 DD DD19647376A patent/DD146738A3/en unknown
-
1977
- 1977-11-19 DE DE19772751809 patent/DE2751809C2/en not_active Expired
- 1977-12-06 GB GB5071177A patent/GB1594500A/en not_active Expired
- 1977-12-14 FI FI773781A patent/FI65390C/en not_active IP Right Cessation
- 1977-12-15 SE SE7714284A patent/SE7714284L/en not_active Application Discontinuation
- 1977-12-16 IT IT6981377A patent/IT1093046B/en active
- 1977-12-19 FR FR7738306A patent/FR2374090A1/en active Granted
- 1977-12-19 CA CA293,351A patent/CA1097827A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| FI65390C (en) | 1984-05-10 |
| DD146738A3 (en) | 1981-03-04 |
| FR2374090B1 (en) | 1984-08-24 |
| FI773781A (en) | 1978-06-21 |
| FR2374090A1 (en) | 1978-07-13 |
| FI65390B (en) | 1984-01-31 |
| SE7714284L (en) | 1978-06-21 |
| DE2751809C2 (en) | 1985-10-03 |
| GB1594500A (en) | 1981-07-30 |
| DE2751809A1 (en) | 1978-06-29 |
| IT1093046B (en) | 1985-07-19 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |