US2778499A - Method of froth flotation - Google Patents

Method of froth flotation Download PDF

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Publication number
US2778499A
US2778499A US309872A US30987252A US2778499A US 2778499 A US2778499 A US 2778499A US 309872 A US309872 A US 309872A US 30987252 A US30987252 A US 30987252A US 2778499 A US2778499 A US 2778499A
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suspension
coal
air
froth
main flow
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US309872A
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Chamberlain Eric Alfre Charles
Waters Percy Lloyd
Robertson William Swan
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Coal Industry Patents Ltd
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Coal Industry Patents Ltd
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    • 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
    • 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
    • B03D1/1443—Feed or discharge mechanisms for flotation tanks
    • B03D1/1462—Discharge mechanisms for the froth
    • 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

Definitions

  • a conditioning agent for example gas oil or creosote
  • a frothing agent for example cresylic acid
  • Suflicient air is then introduced to the suspension so treated to form bubbles which unite preferentially with the coal particles and rise to the top of the suspension to form a froth which is skimmed off and thereafter treated in known manner to form a filter cake.
  • One object of the present invention is to provide a process which can be controlled to suit the quality of the suspension under treatment with a view to obtaining a high coal extraction efliciency.
  • Another object of the invention is to provide a process whereby, in treating a water borne coal suspension by the froth flotation process, the quantity of conditioning and frothing agents will be substantially reduced below what is now regarded as normal.
  • a conditioning agent, a frothing agent and air are introduced into a flow of the suspension 21 major part of the flow containing said agents and air is subjected to a mixing and agitation action, and
  • Figure 1 is a diagrammatic view of one form of apparatus usable in carrying out the invention
  • Figures 2, 3 and 4 are a side elevation, plan and end elevation respectively of a second form.
  • Figure 5 is a perspective view of a detail of a third form.
  • the apparatus shown in Figure 1 comprises a vertical tank a of which the lower part b constitutes a turbulent zone while the upper part c constitutes a quiescent zone.
  • inflow and outflow pipes c and d respectively which are connected to a centrifugal pump e driven by a motor 1.
  • the flow in each of the outflow pipes c and d is controlled by valves v and v respectively.
  • Said pipes are interconnected by means of a by-pass pipe g the flow in which is controlled by valve v whereby the degree of mixing of the suspension and introduced agents can be controlled.
  • the conditioning agent is introduced through a valvecontrolled branch pipe h and the frothing agent through a "ice valve-controlled branch pipe 1', said pipes being connected to a pipe 1' which in turn is connected to the low pressure side of the pump 2.
  • the air intended to form the air bubbles is introduced through a further valve-controlled branch pipe k connected to the pipe
  • the water borne suspension is delivered by means of pump e to the turbulent zone 15 of the tank, and is circulated therein, the suspension passing back to the pump through the return pipe d for recirculation.
  • the rate of flow through the inflow pipe is maintained at a velocity exceeding the critical Reyonlds value.
  • the conditioning agent may be introduced to the pump with or without primary or conditioning air and is thereby dispersed over as large as possible an area of the coal particles.
  • the frothing agent is introduced to the conditioned suspension, or it may be introduced simultaneously with the conditioning agent.
  • air for frothing is introduced in like manner through pipes k and j and forms bubbles in the turbulent zone of the tank.
  • more and more of the water borne suspension together with conditioning agent, frothing agent and air are introduced and circulated through the turbulent zone, some of the suspension then rising in the quiescent zone 0.
  • Air bubbles with particles of coal adhering thereto rise through the quiescent zone to form a froth on the top from which it is skimmed off through the discharge outlet 1.
  • the introduction of the water borne suspension should be such as will keep the apparatus working to capacity, the water and dirt suspension being withdrawn continuously or periodically from the turbulent zone.
  • the degree of turbulence, the amount of air introduced, and the stage or stages at which air is introduced, the amount of conditioning agent and the amount of frothing agent are all capable of independent control to suit the suspension being treated and the desired final product.
  • part of the suspension with either or both of the agents and with or without the air can be by-passed through pipe g to the return flow pipe of the pump without entering the tank and by this means the degree of mixing can be controlled.
  • the apparatus embodies two tanks a in series, separated by a partition p having at its upper end an adjustable slidable flap q for height variation.
  • Duplicate pumps 1, and duplicate systems of piping and valves are provided for each tank.
  • the tailings discharged from the outlet of the left hand tank a is led to the inflow piping d for the right hand pump f for further treatment, while the froth in both tanks rises to the top and is removed by a froth skimmer comprising chains s carrying flights m and driven by rollers r.
  • the inlet pipe c has a curved portion within the tank a so as to direct the incoming flow against the sloping bottom a of the tank a.
  • Figure 5 shows a modified form of tank a which may be used instead of the tank shown in Figure 1.
  • the treated suspension flow entering the tank at the inlet c as in the case of Figure l, the froth leaving at 1 and the tailings at t after flowing past the adjustable partition p In this case however there are no turbulent and quiescent zones in the sense of Figure 1.
  • inlet, outlet and by-pass pipe lines provide a suitable length of'flow for attaining this condition. It is also desirable that air and reagents are introduced at a turbulent region in the fiow.
  • the above described method and apparatus may likewise be applied to the treatment of coal to reduce its ash content. ,When so applied the coal is pulverized and a water borne suspension formed therefrom, this suspension then being treated as above described. By such means a froth formed of coal substantially free of ash is obtained.
  • a method for the recovery of coal from a water borne suspension of coal or of coal and dirt wherein a conditioning agent, a frothing agent and air are introduced into amain fiow of the suspension, the main flow containing said agents and air is subjected to a mixing and agitating action, and a part only of the main flow is then treated for removal of the froth formed thereby, a part of the aerated and agitated main flow variable at will being by-passed Without froth removal to unite with the main flow prior to the mixing and agitating action.
  • a method according to claim 1 wherein a part-of the flow is led for froth removal into a quiescent flow zone located above and in communication with a turbulent flow zone, the froth thereby rising to the upper part of the quiescent zone while the tailings discharge is removed from the lower part of theturbulent zone.

Description

Jan. 22, 1957 E. A. C. CHAMBERLAIN El AL Filed Sept. 16, 1952 METHOD OF FROTH FLOTATION FIG. I
3 Shets-Sheet 1 1957 E. A. c. CHAMBERLAIN ETAL 2,778,499
METHOD OF FROTH FLOTATION Filed Sept. 16, 1952 3 Sheets-Sheet 2 FIG. 2
FIGJ
quiz.
Jan. 22, 1957 E. A. c. CHAMBERLAIN ETAL- 2,
METHOD OF FROTH FLOTATION Filed Sept. 16, 1952 3 Sheets-Sheet 5 United States Patent@ METHOD OF FROTH FLOTATION Eric Alfred Charles Chamberlain, Corstorphine, Edinburgh, Scotland, Percy Lloyd Waters, Forest Hill, London, England, and William Swan Robertson, Edinburgh, Scotland, assignors to Coal Industry (Patents) Limited, London, England, a company of Great Britain Application September 16, 1952, Serial No. 309,872 4 Claims. (Cl. 209-166) This invention relates to a method of use in the recovery of coal from a water borne suspension of coal and dirt such as for example forms the residual product in washing and screening coal, and also for use in the treatment of coal to reduce its dirt content.
It is known to recover the coal from such a suspension by means of a froth flotation process by which fine coal may be recovered in the form of a filter cake containing a relatively low percentage of dirt.
In such process a conditioning agent, for example gas oil or creosote, is introduced to the suspension and thereafter, or it may be simultaneously, a frothing agent, for example cresylic acid, is added thereto. Suflicient air is then introduced to the suspension so treated to form bubbles which unite preferentially with the coal particles and rise to the top of the suspension to form a froth which is skimmed off and thereafter treated in known manner to form a filter cake.
One object of the present invention is to provide a process which can be controlled to suit the quality of the suspension under treatment with a view to obtaining a high coal extraction efliciency.
Another object of the invention is to provide a process whereby, in treating a water borne coal suspension by the froth flotation process, the quantity of conditioning and frothing agents will be substantially reduced below what is now regarded as normal.
According to the present invention a conditioning agent, a frothing agent and air are introduced into a flow of the suspension 21 major part of the flow containing said agents and air is subjected to a mixing and agitation action, and
the total flow is then treated for removal of the froth formed thereby, a minor part of the flow variable at will being by-passed without mixing and agitation to unite with the lrlnixed and agitated flow prior to the removal of the frot The invention will now be described with reference to the annexed drawings in which:
Figure 1 is a diagrammatic view of one form of apparatus usable in carrying out the invention;
Figures 2, 3 and 4 are a side elevation, plan and end elevation respectively of a second form.
Figure 5 is a perspective view of a detail of a third form.
The apparatus shown in Figure 1 comprises a vertical tank a of which the lower part b constitutes a turbulent zone while the upper part c constitutes a quiescent zone. Connected towards the top and foot of the turbulent zone of the tank are inflow and outflow pipes c and d respectively which are connected to a centrifugal pump e driven by a motor 1. The flow in each of the outflow pipes c and d is controlled by valves v and v respectively. Said pipes are interconnected by means of a by-pass pipe g the flow in which is controlled by valve v whereby the degree of mixing of the suspension and introduced agents can be controlled.
The conditioning agent is introduced through a valvecontrolled branch pipe h and the frothing agent through a "ice valve-controlled branch pipe 1', said pipes being connected to a pipe 1' which in turn is connected to the low pressure side of the pump 2. The air intended to form the air bubbles is introduced through a further valve-controlled branch pipe k connected to the pipe When the apparatus is in operation the water borne suspension is delivered by means of pump e to the turbulent zone 15 of the tank, and is circulated therein, the suspension passing back to the pump through the return pipe d for recirculation. The rate of flow through the inflow pipe is maintained at a velocity exceeding the critical Reyonlds value. The conditioning agent may be introduced to the pump with or without primary or conditioning air and is thereby dispersed over as large as possible an area of the coal particles.
In like manner, the frothing agent is introduced to the conditioned suspension, or it may be introduced simultaneously with the conditioning agent. Finally air for frothing is introduced in like manner through pipes k and j and forms bubbles in the turbulent zone of the tank. Thereafter more and more of the water borne suspension together with conditioning agent, frothing agent and air are introduced and circulated through the turbulent zone, some of the suspension then rising in the quiescent zone 0. Air bubbles with particles of coal adhering thereto rise through the quiescent zone to form a froth on the top from which it is skimmed off through the discharge outlet 1. The introduction of the water borne suspension should be such as will keep the apparatus working to capacity, the water and dirt suspension being withdrawn continuously or periodically from the turbulent zone.
The degree of turbulence, the amount of air introduced, and the stage or stages at which air is introduced, the amount of conditioning agent and the amount of frothing agent are all capable of independent control to suit the suspension being treated and the desired final product.
Further, part of the suspension with either or both of the agents and with or without the air can be by-passed through pipe g to the return flow pipe of the pump without entering the tank and by this means the degree of mixing can be controlled.
In Figures 2-4 where like parts are denoted by like references, the apparatus embodies two tanks a in series, separated by a partition p having at its upper end an adjustable slidable flap q for height variation. Duplicate pumps 1, and duplicate systems of piping and valves are provided for each tank. The tailings discharged from the outlet of the left hand tank a is led to the inflow piping d for the right hand pump f for further treatment, while the froth in both tanks rises to the top and is removed by a froth skimmer comprising chains s carrying flights m and driven by rollers r.
The general mode of operation of this apparatus is otherwise similar to that described in connection with Figure 1.
In Figure 4 the inlet pipe c has a curved portion within the tank a so as to direct the incoming flow against the sloping bottom a of the tank a.
Figure 5 shows a modified form of tank a which may be used instead of the tank shown in Figure 1. In this form also like references denote like parts, the treated suspension flow entering the tank at the inlet c as in the case of Figure l, the froth leaving at 1 and the tailings at t after flowing past the adjustable partition p In this case however there are no turbulent and quiescent zones in the sense of Figure 1.
In order to give the necessary high degree of mixing and dispersion of air and reagents with the water borne coal suspension, it is essential that the velocity of the water borne suspension flowing through some part of the pumping system should exceed the critical Reynolds value. The
inlet, outlet and by-pass pipe lines provide a suitable length of'flow for attaining this condition. It is also desirable that air and reagents are introduced at a turbulent region in the fiow.
The above described method and apparatus may likewise be applied to the treatment of coal to reduce its ash content. ,When so applied the coal is pulverized and a water borne suspension formed therefrom, this suspension then being treated as above described. By such means a froth formed of coal substantially free of ash is obtained.
We claim:
1. A method for the recovery of coal from a water borne suspension of coal or of coal and dirt, wherein a conditioning agent, a frothing agent and air are introduced into amain fiow of the suspension, the main flow containing said agents and air is subjected to a mixing and agitating action, and a part only of the main flow is then treated for removal of the froth formed thereby, a part of the aerated and agitated main flow variable at will being by-passed Without froth removal to unite with the main flow prior to the mixing and agitating action.
2. A method according to claim 1, wherein the agents and air are introduced into the main flow immediately prior to the mixing and agitating action.
3. A method according to claim 1 wherein a part-of the flow is led for froth removal into a quiescent flow zone located above and in communication with a turbulent flow zone, the froth thereby rising to the upper part of the quiescent zone while the tailings discharge is removed from the lower part of theturbulent zone.
4. A method according to claim 3, wherein. apart of the flow variable at will is led from the lower part of the turbulent zone into the main flow before mixing and agitating. 1
References Cited in the file of this patent UNITED STATES PATENTS 1,334,720 Thompson Mar. 23, 1920 1,511,643 Trent Oct. 14, 1924 1,767,400 Remick June 24, 1930 2,142,207 Price Ian. 3, 1939 2,494,602 Wright Jan. 17, 1950 2,697,384 Craig et al Dec. 21, 1954 FOREIGN PATENTS 18,944 Great Britain of 1913 20,411 France Dec. 21, 1917 (1st addition to No. 467,018)
104,366 Great Britain Feb. 26, 1917

Claims (1)

1. A METHOD FOR THE RECOVERY OF COAL FROM A WATER BORNE SUSPENSION OF COAL OR OF COAL AND DIRT, WHEREIN A CONDITIONING AGENT, A FROTHING AGENT AND AIR ARE INTRODUCED INTO A MAIN FLOW OF THE SUSPENSION, THE MAIN FLOW CONTAINING SAID AGENTS AND AIR IS SUBJECTED TO A MIXING AND AGITATING ACTION, AND A PART ONLY OF THE MAIN FLOW IS THEN TREATED FOR REMOVAL OF THE FROTH FORMED THEREBY, A PART OF THE AERATED AND AGITATED MAIN FLOW VARIABLE AT WILL BEING BY-PASSED WITHOUT FROTH REMOVAL TO UNITE WITH THE MAIN FLOW PRIOR TO THE MIXING AND AGITATING ACTION.
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Cited By (33)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3048272A (en) * 1961-04-18 1962-08-07 Heyl & Patterson Froth flotation process
US3053761A (en) * 1957-05-22 1962-09-11 Horace A Bradt Process for separation of liquid from liquid-solid mixtures of fine solid particle size
US3131144A (en) * 1959-05-21 1964-04-28 Nalco Chemical Co Filtration process
DE1190412B (en) * 1961-04-18 1965-04-08 Heyl & Patterson Process for froth flotation
US3446353A (en) * 1966-04-25 1969-05-27 Zinc Corp Ltd The Method and apparatus for froth flotation
US3642617A (en) * 1970-01-29 1972-02-15 Fmc Corp Foam flotation concentrator
US3759385A (en) * 1969-06-18 1973-09-18 Cribla Sa Method and apparatus for separating mixtures of fine grain materials
US3772190A (en) * 1970-10-15 1973-11-13 Duerr O Kg Method for purifying water
US3785490A (en) * 1972-01-03 1974-01-15 Dorwin W Teague Ass Inc Water purification apparatus
US4065385A (en) * 1976-01-07 1977-12-27 Inland Steel Company Apparatus and method for separating a mixture of liquid and coal fines
US4072612A (en) * 1976-05-25 1978-02-07 Daniel William H Aerator for bodies of water
US4203837A (en) * 1976-01-16 1980-05-20 Hoge John H Process for removal of discrete particulates and solutes from liquids by foam flotation
US4289609A (en) * 1978-05-02 1981-09-15 Uranium Recovery Corporation Process for removing solid organic materials and other impurities from wet-process phosphoric acid
US4324656A (en) * 1978-10-24 1982-04-13 Godar Serge E Installation for the withdrawal and purification treatment of waters and aqueous effluents
US4330403A (en) * 1978-09-25 1982-05-18 Hubert Fuchs Apparatus for purifying polluted liquids
EP0104099A2 (en) * 1982-08-25 1984-03-28 Engelhard Corporation Method for froth flotation
US4457850A (en) * 1982-10-14 1984-07-03 Henkel Kommanditgesellschaft Auf Aktien Flotation aids and process for non-sulfidic minerals
US4555335A (en) * 1978-06-05 1985-11-26 Burris W Alan Ozonator feed system
US4981582A (en) * 1988-01-27 1991-01-01 Virginia Tech Intellectual Properties, Inc. Process and apparatus for separating fine particles by microbubble flotation together with a process and apparatus for generation of microbubbles
US5019244A (en) * 1987-11-16 1991-05-28 Cole Jr Howard W Method of separating mineral particles by froth flotation
US5096572A (en) * 1990-03-12 1992-03-17 Board Of Control Of Michigan Tech. University Froth flotation
US5116487A (en) * 1990-07-27 1992-05-26 University Of Kentucky Research Foundation Froth flotation method for recovery of ultra-fine constituent
US5167798A (en) * 1988-01-27 1992-12-01 Virginia Tech Intellectual Properties, Inc. Apparatus and process for the separation of hydrophobic and hydrophilic particles using microbubble column flotation together with a process and apparatus for generation of microbubbles
US5188726A (en) * 1989-07-26 1993-02-23 University Of Newcastle Research Associates Ltd. Method of operating a plurality of minerals separation flotation cells
US5249688A (en) * 1990-03-12 1993-10-05 Board Of Control Of Michigan Technological University Froth flotation apparatus
US5282538A (en) * 1990-10-31 1994-02-01 Multotec Cyclones (Proprietary) Limited Flotation column
US5294003A (en) * 1990-09-26 1994-03-15 Hollingsworth Clinton A Process for concentration of minerals
US5431286A (en) * 1994-01-06 1995-07-11 Inco Limited Recirculating column flotation apparatus
US5467876A (en) * 1995-04-04 1995-11-21 The United States Of America As Represented By The Secretary Of The Interior Method and apparatus for concentration of minerals by froth flotation
US5814210A (en) * 1988-01-27 1998-09-29 Virginia Tech Intellectual Properties, Inc. Apparatus and process for the separation of hydrophobic and hydrophilic particles using microbubble column flotation together with a process and apparatus for generation of microbubbles
US20030230122A1 (en) * 2002-06-14 2003-12-18 Lee Yong Mi Washing machine equipped with means for generating microbubbles of air
US20090283146A1 (en) * 2006-06-30 2009-11-19 Newcastle Innovation Limited Device and method for detecting the frothing ability of a fluid
US20100193408A1 (en) * 2007-02-26 2010-08-05 Newcastle Innovation Limited Method and apparatus for flotation in a fluidized bed

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FR467018A (en) * 1913-01-06 1914-06-02 Gunnar Sigge Andreas Appelqvis Method and apparatus for the preparation of ores and other similar substances
GB191318944A (en) * 1913-08-20 1914-07-30 Edward Primosigh Improvements in or relating to the Separation of Ore.
GB104366A (en) * 1916-02-26 1917-02-26 Minerals Separation Ltd Improvements in or relating to Apparatus for the Concentration of Ores.
FR20411E (en) * 1914-01-05 1917-12-21 Gunnar Sigge Andreas Appelqvis Method and apparatus for the preparation of ores and other similar substances
US1334720A (en) * 1916-11-16 1920-03-23 Metals Recovery Co Sulfidation and flotation of minerals
US1511643A (en) * 1921-10-21 1924-10-14 Lamartine C Trent Hydraulic classifier
US1767400A (en) * 1929-05-27 1930-06-24 Walter L Remick Process of the separation of combustible material from its associated noncombustiblematerial
US2142207A (en) * 1935-10-29 1939-01-03 Colorado Fuel & Iron Corp Flotation process
US2494602A (en) * 1945-08-07 1950-01-17 Harold M Wright Froth flotation apparatus
US2697384A (en) * 1950-01-14 1954-12-21 Paper Patents Co Process for removing dirt from wood pulp

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR467018A (en) * 1913-01-06 1914-06-02 Gunnar Sigge Andreas Appelqvis Method and apparatus for the preparation of ores and other similar substances
GB191318944A (en) * 1913-08-20 1914-07-30 Edward Primosigh Improvements in or relating to the Separation of Ore.
FR20411E (en) * 1914-01-05 1917-12-21 Gunnar Sigge Andreas Appelqvis Method and apparatus for the preparation of ores and other similar substances
GB104366A (en) * 1916-02-26 1917-02-26 Minerals Separation Ltd Improvements in or relating to Apparatus for the Concentration of Ores.
US1334720A (en) * 1916-11-16 1920-03-23 Metals Recovery Co Sulfidation and flotation of minerals
US1511643A (en) * 1921-10-21 1924-10-14 Lamartine C Trent Hydraulic classifier
US1767400A (en) * 1929-05-27 1930-06-24 Walter L Remick Process of the separation of combustible material from its associated noncombustiblematerial
US2142207A (en) * 1935-10-29 1939-01-03 Colorado Fuel & Iron Corp Flotation process
US2494602A (en) * 1945-08-07 1950-01-17 Harold M Wright Froth flotation apparatus
US2697384A (en) * 1950-01-14 1954-12-21 Paper Patents Co Process for removing dirt from wood pulp

Cited By (43)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3053761A (en) * 1957-05-22 1962-09-11 Horace A Bradt Process for separation of liquid from liquid-solid mixtures of fine solid particle size
US3131144A (en) * 1959-05-21 1964-04-28 Nalco Chemical Co Filtration process
US3048272A (en) * 1961-04-18 1962-08-07 Heyl & Patterson Froth flotation process
DE1190412B (en) * 1961-04-18 1965-04-08 Heyl & Patterson Process for froth flotation
US3446353A (en) * 1966-04-25 1969-05-27 Zinc Corp Ltd The Method and apparatus for froth flotation
US3759385A (en) * 1969-06-18 1973-09-18 Cribla Sa Method and apparatus for separating mixtures of fine grain materials
US3642617A (en) * 1970-01-29 1972-02-15 Fmc Corp Foam flotation concentrator
US3772190A (en) * 1970-10-15 1973-11-13 Duerr O Kg Method for purifying water
US3785490A (en) * 1972-01-03 1974-01-15 Dorwin W Teague Ass Inc Water purification apparatus
US4065385A (en) * 1976-01-07 1977-12-27 Inland Steel Company Apparatus and method for separating a mixture of liquid and coal fines
US4203837A (en) * 1976-01-16 1980-05-20 Hoge John H Process for removal of discrete particulates and solutes from liquids by foam flotation
US4072612A (en) * 1976-05-25 1978-02-07 Daniel William H Aerator for bodies of water
US4289609A (en) * 1978-05-02 1981-09-15 Uranium Recovery Corporation Process for removing solid organic materials and other impurities from wet-process phosphoric acid
US4555335A (en) * 1978-06-05 1985-11-26 Burris W Alan Ozonator feed system
US4330403A (en) * 1978-09-25 1982-05-18 Hubert Fuchs Apparatus for purifying polluted liquids
US4324656A (en) * 1978-10-24 1982-04-13 Godar Serge E Installation for the withdrawal and purification treatment of waters and aqueous effluents
AU567110B2 (en) * 1982-08-25 1987-11-12 Engelhard Corporation Froth flotation treatment of clay
EP0104099A3 (en) * 1982-08-25 1986-01-02 Engelhard Corporation Apparatus and method for froth flotation
EP0104099A2 (en) * 1982-08-25 1984-03-28 Engelhard Corporation Method for froth flotation
US4472271A (en) * 1982-08-25 1984-09-18 Freeport Kaolin Company Froth flotation apparatus and process
US4457850A (en) * 1982-10-14 1984-07-03 Henkel Kommanditgesellschaft Auf Aktien Flotation aids and process for non-sulfidic minerals
US5019244A (en) * 1987-11-16 1991-05-28 Cole Jr Howard W Method of separating mineral particles by froth flotation
US5397001A (en) * 1988-01-27 1995-03-14 Virginia Polytechnic Institute & State U. Apparatus for the separation of hydrophobic and hydrophilic particles using microbubble column flotation together with a process and apparatus for generation of microbubbles
US4981582A (en) * 1988-01-27 1991-01-01 Virginia Tech Intellectual Properties, Inc. Process and apparatus for separating fine particles by microbubble flotation together with a process and apparatus for generation of microbubbles
US5814210A (en) * 1988-01-27 1998-09-29 Virginia Tech Intellectual Properties, Inc. Apparatus and process for the separation of hydrophobic and hydrophilic particles using microbubble column flotation together with a process and apparatus for generation of microbubbles
US5167798A (en) * 1988-01-27 1992-12-01 Virginia Tech Intellectual Properties, Inc. Apparatus and process for the separation of hydrophobic and hydrophilic particles using microbubble column flotation together with a process and apparatus for generation of microbubbles
US5188726A (en) * 1989-07-26 1993-02-23 University Of Newcastle Research Associates Ltd. Method of operating a plurality of minerals separation flotation cells
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