US3804243A - Separation of mica from clay by froth flotation - Google Patents

Separation of mica from clay by froth flotation Download PDF

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US3804243A
US3804243A US00266159A US26615972A US3804243A US 3804243 A US3804243 A US 3804243A US 00266159 A US00266159 A US 00266159A US 26615972 A US26615972 A US 26615972A US 3804243 A US3804243 A US 3804243A
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clay
ethylene oxide
pulp
phosphate ester
muscovite
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US00266159A
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D Yang
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BASF Catalysts LLC
Phibro Corp
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Engelhard Minerals and Chemicals Corp
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Assigned to ENGLEHARD CORPORATION A CORP. OF DE. reassignment ENGLEHARD CORPORATION A CORP. OF DE. ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: PHIBRO CORPORATION
Assigned to PHIBRO CORPORATION reassignment PHIBRO CORPORATION CHANGE OF NAME (SEE DOCUMENT FOR DETAILS). EFFECTIVE MARCH 14, 1960 DELAWARE Assignors: ENGELHARD MINERALS & CHEMICALS CORPORATION
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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
    • B03D1/02—Froth-flotation processes
    • B03D1/06—Froth-flotation processes differential
    • 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
    • B03D1/001—Flotation agents
    • B03D1/004—Organic compounds
    • B03D1/014—Organic compounds containing phosphorus
    • 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
    • B03D2201/00—Specified effects produced by the flotation agents
    • B03D2201/02—Collectors
    • 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
    • B03D2203/00—Specified materials treated by the flotation agents; specified applications
    • B03D2203/02—Ores
    • B03D2203/04—Non-sulfide ores

Definitions

  • High purity kaolin clay is widely used as a coating pigment for paper and paints. Such pigments must be free from abrasive impurities, of which mica is an example. The presence of mica in more than trace quantity may render the clay unsatisfactory for use as a pigment.
  • Mica can be removed from clay with reasonable. ease by gravimetric means or flotation when the clay is coarse. However, when the clay particles and micaceous impurities are fine, the separation is very difficult. Froth flotation with conventional ionic collectors is usually unsuccessful because mica and kaolin, both silicate minerals, have similar flotation properties.
  • An object of the invention is to provide a novel method for removing finely divided mica from finely divided kaolin clay by froth flotation.
  • a specific object is to provide a novel collector system for floating mica from kaolin clay.
  • a micaceous impurity especially muscovite mica
  • a micaceous impurity is'removed from kaolin clay by deflocculating a pulp of the impure clay, preferably activating the mica with an aluminum salt, and subjecting the ore pulp to froth flotation in an alkaline flotation circuit in the presence of a complex phosphate ester, or salt thereof, of a nonionic surface active ethylene or propylene oxide adduct.
  • the impure clay ore is blunged in water.
  • Coarse grit and undispersible agglomerates are removed in conventional manner, e.g., by sedimentation, or by treatment in sand boxes.
  • a clay dispersant (deflocculant) is added before or after degritting.
  • the dispersant used may vary with the nature of the clay. Examples of dispersants are soda ash, sodium silicate, sodium lignosulfonate and sodium condensed phosphates, alone or in combination. Good results have been realized when soda ash was added to adjust pH to a value within the range of9 to l l and sodium silicate. phosphate or lignosulfonate was added to deflocculate the pulp and depress the clay.
  • Water soluble aluminum salts e.g.. aluminumchloride. nitrate or sulfate, are used in carrying out the invention in order to activate the mica.
  • the salts are added as aqueous solutions to the deflocculated alkaline pulps and mixed therewith before adding the collector. Small quantities of aluminum salts are used.
  • the aluminum salt can be incorporated into the pulp before or after the phosphate ester collector is added.
  • these are complex phosphate esters (or salt thereof) of a nonionic surface active compound, the phosphate being selected from the group consisting of monoesters, diesters and mixtures thereof, the nonionic surface active compound being the condensation product of an organic hydroxy compound of from 8 to carbon atoms selected from the group consisting of alkyl phenol and alkanols with at least 1 mole of an alkylene oxide having from 2 to 3 carbon atoms, the nonionic surface active compound containing a maximum of about 50 percent by weight of alkylene oxide based on the weight of the nonionic surface active compound.
  • the phosphate esters are commercially available under the trade name GAFAC and are anionic surfactants.
  • the commercial products are usually mixtures of monoand di-esters.
  • GAFAC RO-310 is understood to be a mixture of monoester and diester, principally diester.
  • the monoester constituent may be described by the formula:
  • the diester constituent has the formula:
  • ester can be used in salt form (e.g., sodium, ammonium, calcium, magnesium). in use the acid would be converted to alkali metal salt form in the basic clay pulp.
  • salt form e.g., sodium, ammonium, calcium, magnesium
  • the ester is used in amount within the range of 0.1 to 3 lbs/ton, usually within the range of about 0.5 to 1.5 lb./ton.
  • the phosphate esters normally provide adequate frothing.
  • a small amount of a conventional frother such as methyl isobutylcarbinol or pine oil may be added to improve the froth.
  • Flotation may be carried out at solids within the range of about 5 percent to 50 percent, preferably 20 percent to 45 percent solids.
  • the clay in the tailings may be fractionated in conventional manner to recover one or more fine size fractions of beneficiated clay. in some cases, the fine fractions are lower in mica than the flotation tailings.
  • the clay used in the test was a kaolin from France.
  • the principal impurity in the clay was muscovite.
  • the degritted minus 325 mesh (Tyler) portion of the impure clay analyzed 2.67 percent K 0, corresponding to 22.6 percent muscovite.
  • a sample of the crude clay (9,000 gm., dry basis) was blunged in deionized water at about 35 percent solids for minutes. The slip was screened on a Sweco vibratory screen and the minus 325 mesh fraction of the slip was recovered.
  • the degritted slip (minus 325 mesh fraction) was charged to a Fagergren conditioner at percent solids. Soda ash was added in amount of 1.0 lb./ton and the slip was conditioned for 1 minute. The pH was 1 1.0. Sodium lignin sulfonate was added in amount of 0.5 lb./ton, followed by conditioning for 6 minutes. Aluminum chloride was added in amount of 0.5 lb./ton (calculated as AlCl '6H O), followed by 2 minutes conditioning. GA'FAC RO-3l0, 0.5 lb./ton, was incorpo' rated, followed by 6 minutes conditioning. The pH of the conditioned pulp was I 1.0.
  • the conditioned pulp was transferred to a Denver flotation machine and the froth was collected.
  • the froth mica concentrate
  • tailings purified kaolin
  • nonionic alkylene oxide adduct being the condensation product of an organic hydroxy .compound containing from 8 to 50 carbon atoms and selected from the group consisting of alkyl phenol and alkanol with at least 1 mole of an alkylene oxide having 2 to 3 carbon atoms, said nonionic alkylene oxide adduct containing a maximum of about 50% by weight of alkylene oxide.
  • a process for removing a muscovite impurity from kaolin clay comprising providing a deflocculated aqueous pulp of kaolin clay containing muscoviteas an impurity, conditioning said pulp with a water-soluble aluminum salt and thereafter with a small amount of a complex phosphate ester, or salt thereof, of a nonionic surface active ethylene oxide adduct as a collector for the muscovite, and subjecting the pulp to froth flotation, thereby producing a froth which is a concentrate of muscovite and a tailing containing purified clay, said phosphate ester being selected from the group consisting of monoester, diester and mixtures thereof, said nonionic ethylene oxide adductbeing the condensation product of an organic hydroxy compound containing from 8 to 50 carbon atoms and selected from the group consisting of alkyl phenol and alkanol with at least one mole of ethylene oxide, said ethylene oxide adduct

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Abstract

Mica, present as an impurity in kaolin clay, is removed from the clay by froth flotation in an alkaline pulp with a complex phosphate ester of a nonionic surfactant of the ethylene oxideadduct type, using an aluminum salt to activate the flotation of the mica.

Description

United States Patent [191 Yan A r. 16 1974 [S4] SEPARATION OF MICA FROM CLAY BY 3,037,627 6/1962 Nazen 209/167 X FROTH FLOTATION 3,259,237 7/1966 Scheld 209/166 X 3,329,265 7/1967 Browning t 209/166 Inventor: David g, Edlson, 3,462,013 8/1969 Mencade 209/166 x 3,480,143 11/1969 Mitzwajer.... 209/166 [73] Assgnee' 2:53:12 ?'xggg fi gg g'g 3,567,636 3/1971 Katzenstein 252/32 .1
6 FOREIGN PATENTS OR APPLICATIONS [22] Ffled' June 2 1,044,733 11/1958 Germany 209/166 [21] Appl; No.: 266,159
Primary Examiner-Robert Halper [52] U S 209/166 252/61 Attorney, Agent, or 'Firm-Melvin C. Flint; Inez L.
51 int. c1 B0311 1/02 Msene [58] Fleld of Search 209/166, 5l;O265/g68lI; ABSTRACT Mica, present as an impurity in kaolin clay, is removed 5 References Cited from the clay by froth flotation in an alkaline pulp UNITED STATES PATENTS with a complex phosphate ester of a nonionic surfactant of the ethylene oxide-adduct type, using an alumigz igg 2? num salt to activate the flotation of the mica. 3:009:570 11/1961 Lancaster 209/5 5 Claims, N0 Drawings SEPARATION OF MICA FROM'CLAY BY FROTH: FLOTATION BACKGROUND OF THE INVENTION High purity kaolin clay is widely used as a coating pigment for paper and paints. Such pigments must be free from abrasive impurities, of which mica is an example. The presence of mica in more than trace quantity may render the clay unsatisfactory for use as a pigment.
Mica can be removed from clay with reasonable. ease by gravimetric means or flotation when the clay is coarse. However, when the clay particles and micaceous impurities are fine, the separation is very difficult. Froth flotation with conventional ionic collectors is usually unsuccessful because mica and kaolin, both silicate minerals, have similar flotation properties.
THE INVENTION An object of the invention is to provide a novel method for removing finely divided mica from finely divided kaolin clay by froth flotation.
' A specific object is to provide a novel collector system for floating mica from kaolin clay.
Briefly stated, in accordance with the present invention, a micaceous impurity, especially muscovite mica, is'removed from kaolin clay by deflocculating a pulp of the impure clay, preferably activating the mica with an aluminum salt, and subjecting the ore pulp to froth flotation in an alkaline flotation circuit in the presence of a complex phosphate ester, or salt thereof, of a nonionic surface active ethylene or propylene oxide adduct.
PRIOR ART DETAILED DESCRIPTION in putting the invention into practice, the impure clay ore is blunged in water. Coarse grit and undispersible agglomerates are removed in conventional manner, e.g., by sedimentation, or by treatment in sand boxes.
A clay dispersant (deflocculant) is added before or after degritting. The dispersant used may vary with the nature of the clay. Examples of dispersants are soda ash, sodium silicate, sodium lignosulfonate and sodium condensed phosphates, alone or in combination. Good results have been realized when soda ash was added to adjust pH to a value within the range of9 to l l and sodium silicate. phosphate or lignosulfonate was added to deflocculate the pulp and depress the clay.
Water soluble aluminum salts. e.g.. aluminumchloride. nitrate or sulfate, are used in carrying out the invention in order to activate the mica. The salts are added as aqueous solutions to the deflocculated alkaline pulps and mixed therewith before adding the collector. Small quantities of aluminum salts are used.
e.b., A to 1 lb./ton, usually A 1b./ton. The aluminum salt can be incorporated into the pulp before or after the phosphate ester collector is added.
The phosphate esters of nonionic surface active agents which are used as collectors in carrying out the invention are described in U. S. Pat. No. 3,567,636 to Katzenstein. The pertinent disclosures in the Katzenstein patent as to the composition of such esters and to their preparation are incorporated herein by reference. Briefly, these are complex phosphate esters (or salt thereof) of a nonionic surface active compound, the phosphate being selected from the group consisting of monoesters, diesters and mixtures thereof, the nonionic surface active compound being the condensation product of an organic hydroxy compound of from 8 to carbon atoms selected from the group consisting of alkyl phenol and alkanols with at least 1 mole of an alkylene oxide having from 2 to 3 carbon atoms, the nonionic surface active compound containing a maximum of about 50 percent by weight of alkylene oxide based on the weight of the nonionic surface active compound.
The phosphate esters are commercially available under the trade name GAFAC and are anionic surfactants. The commercial products are usually mixtures of monoand di-esters. The product GAFAC RO-310 is understood to be a mixture of monoester and diester, principally diester. The monoester constituent may be described by the formula:
wherein R oleyl; and n is 4 to 5.
The diester constituent has the formula:
wherein R oleyl, n is 4 to 5.
Obviously the ester can be used in salt form (e.g., sodium, ammonium, calcium, magnesium). in use the acid would be converted to alkali metal salt form in the basic clay pulp.
Generally, the ester is used in amount within the range of 0.1 to 3 lbs/ton, usually within the range of about 0.5 to 1.5 lb./ton.
The phosphate esters normally provide adequate frothing. In some cases, a small amount of a conventional frother such as methyl isobutylcarbinol or pine oil may be added to improve the froth.
Flotation may be carried out at solids within the range of about 5 percent to 50 percent, preferably 20 percent to 45 percent solids.
After flotation the clay in the tailings may be fractionated in conventional manner to recover one or more fine size fractions of beneficiated clay. in some cases, the fine fractions are lower in mica than the flotation tailings.
The following example is given for illustrative purposes and is not to be considered as limiting upon the invention.
The clay used in the test was a kaolin from France. The principal impurity in the clay was muscovite. The degritted minus 325 mesh (Tyler) portion of the impure clay analyzed 2.67 percent K 0, corresponding to 22.6 percent muscovite.
A sample of the crude clay (9,000 gm., dry basis) was blunged in deionized water at about 35 percent solids for minutes. The slip was screened on a Sweco vibratory screen and the minus 325 mesh fraction of the slip was recovered.
The degritted slip (minus 325 mesh fraction) was charged to a Fagergren conditioner at percent solids. Soda ash was added in amount of 1.0 lb./ton and the slip was conditioned for 1 minute. The pH was 1 1.0. Sodium lignin sulfonate was added in amount of 0.5 lb./ton, followed by conditioning for 6 minutes. Aluminum chloride was added in amount of 0.5 lb./ton (calculated as AlCl '6H O), followed by 2 minutes conditioning. GA'FAC RO-3l0, 0.5 lb./ton, was incorpo' rated, followed by 6 minutes conditioning. The pH of the conditioned pulp was I 1.0.
The conditioned pulp was transferred to a Denver flotation machine and the froth was collected. The froth (mica concentrate) and tailings (purified kaolin) were recovered and analyzed. Results are summarized in table form.
Metallurgical results in the table show that froth flotation of the pulp of the impure clay with a phosphate ester complex as the collector reduced the mica content of the clay from 22.6 percent to 12.3 percent at a clay recovery of about 62 percent.
FLOTATlON OF. MUSCOVITE FROM KAOLIN WITH COMPLEX PHOSPHATE ESTER COLLECTOR Flotation Muscovitc Distribution of Product Wt. "/1 "/1 K- .O Mica, "/r Mica, 7:
Head 100.0 2.07 i 22.0 100.0 Froth Product 37.8 4.67 39.6 66.2 Tuilings 62.2 1.45 12.3 33.8
* Calculated I claim:
nonionic alkylene oxide adduct being the condensation product of an organic hydroxy .compound containing from 8 to 50 carbon atoms and selected from the group consisting of alkyl phenol and alkanol with at least 1 mole of an alkylene oxide having 2 to 3 carbon atoms, said nonionic alkylene oxide adduct containing a maximum of about 50% by weight of alkylene oxide.
2. The process of claim i wherein said aluminum salt is added to the pulp before adding said complex phosphate ester.
3. The process of claim 2 wherein the flotation is carried out at a pH within the range of 9 to l l.
4. In a process for removing a muscovite impurity from kaolin clay, the step comprising providing a deflocculated aqueous pulp of kaolin clay containing muscoviteas an impurity, conditioning said pulp with a water-soluble aluminum salt and thereafter with a small amount of a complex phosphate ester, or salt thereof, of a nonionic surface active ethylene oxide adduct as a collector for the muscovite, and subjecting the pulp to froth flotation, thereby producing a froth which is a concentrate of muscovite and a tailing containing purified clay, said phosphate ester being selected from the group consisting of monoester, diester and mixtures thereof, said nonionic ethylene oxide adductbeing the condensation product of an organic hydroxy compound containing from 8 to 50 carbon atoms and selected from the group consisting of alkyl phenol and alkanol with at least one mole of ethylene oxide, said ethylene oxide adduct containing amaximum of about 50% by weight of ethylene oxide.
5. The process of claim 4'in which said phosphate ester is a mixture of monoester and diester, principally diester, wherein the monoester has the following formula:
aowmcmok o notomcmo o wherein R oleyl; and n is'4 to 5.

Claims (4)

  1. 2. The process of claim 1 wherein said aluminum salt is added to the pulp before adding said complex phosphate ester.
  2. 3. The process of claim 2 wherein the flotation is carried out at a pH within the range of 9 to 11.
  3. 4. In a process for removing a muscovite impurity from kaolin clay, the step comprising providing a deflocculated aqueous pulp of kaolin clay containing muscovite as an impurity, conditioning said pulp with a water-soluble aluminum salt and thereafter with a small amount of a complex phosphate ester, or salt thereof, of a nonionic surface active ethylene oxide adduct as a collector for the muscovite, and subjecting the pulp to froth flotation, thereby producing a froth which is a concentrate of muscovite and a tailing containing purified clay, said phosphate ester being selected from the group consisting of monoester, diester and mixtures thereof, said nonionic ethylene oxide adduct being the condensation product of an organic hydroxy compound containing from 8 to 50 carbon atoms and selected from the group consisting of alkyl phenol and alkanol with at least one mole of ethylene oxide, said ethylene oxide adduct containing a maximum of about 50% by weight of ethylene oxide.
  4. 5. The process of claim 4 in which said phosphate ester is a mixture of monoester and diester, principally diester, wherein the monoester has the following formula:
US00266159A 1972-06-26 1972-06-26 Separation of mica from clay by froth flotation Expired - Lifetime US3804243A (en)

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Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4097372A (en) * 1974-10-08 1978-06-27 Anglo-American Clays Corporation Method for improving clay brightness utilizing magnetic separation
US4098688A (en) * 1976-07-21 1978-07-04 Anglo-American Clays Corporation Brightening of clay by froth flotation
US4324653A (en) * 1979-12-17 1982-04-13 Bureau De Recherches Geologiques Et Minieres Process for the treatment of phosphate ores with silico-carbonate gangue
WO1984001114A1 (en) * 1982-09-13 1984-03-29 Anglo American Clays Corp Beneficiation of clays by froth flotation
US4744892A (en) * 1985-02-27 1988-05-17 Henkel Kommanditgesellschaft Auf Aktien Process for dressing kaolinite by flotation
FR2700976A1 (en) * 1993-02-04 1994-08-05 Mircal Process for the recovery of micas by flotation and micas thus obtained
WO2002089991A2 (en) * 2001-05-02 2002-11-14 Ge Betz, Inc. Mineral ore flotation aid
WO2020157106A1 (en) * 2019-02-01 2020-08-06 Basf Se Mixture of fatty acids and alkylether phosphates as a collector for phosphate ore flotation

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2162494A (en) * 1934-08-20 1939-06-13 Minerals Separation North Us Concentration of phosphate ores
US2759962A (en) * 1950-05-31 1956-08-21 Ici Ltd Production of new esters of ortho-phosphoric acid and salts thereof
DE1044733B (en) * 1956-08-23 1958-11-27 Elektroisola Narodni Podnik Process for the production of pure mica particles from raw mine mica
US3009570A (en) * 1957-12-02 1961-11-21 Kings Mountain Mica Company Process for eliminating clay slimes from mica
US3037627A (en) * 1958-06-16 1962-06-05 Kerr Mc Gee Oil Ind Inc Method of beneficiating sulfide and oxide ores of copper, manganese, lead and zinc
US3259237A (en) * 1963-04-22 1966-07-05 Saskatchewan Potash Phase desliming and concentration of potash ores
US3329265A (en) * 1964-08-18 1967-07-04 James S Browning Flotation of mica
US3462013A (en) * 1967-07-19 1969-08-19 Engelhard Min & Chem Method for beneficiating clay by flotation of colored impurities
US3480143A (en) * 1965-03-28 1969-11-25 Chem & Phosphates Ltd Flotation of siliceous ores
US3567636A (en) * 1963-12-31 1971-03-02 Gaf Corp Ester-based lubricating oils containing polyalkyleneoxide-phosphate esters

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2162494A (en) * 1934-08-20 1939-06-13 Minerals Separation North Us Concentration of phosphate ores
US2759962A (en) * 1950-05-31 1956-08-21 Ici Ltd Production of new esters of ortho-phosphoric acid and salts thereof
DE1044733B (en) * 1956-08-23 1958-11-27 Elektroisola Narodni Podnik Process for the production of pure mica particles from raw mine mica
US3009570A (en) * 1957-12-02 1961-11-21 Kings Mountain Mica Company Process for eliminating clay slimes from mica
US3037627A (en) * 1958-06-16 1962-06-05 Kerr Mc Gee Oil Ind Inc Method of beneficiating sulfide and oxide ores of copper, manganese, lead and zinc
US3259237A (en) * 1963-04-22 1966-07-05 Saskatchewan Potash Phase desliming and concentration of potash ores
US3567636A (en) * 1963-12-31 1971-03-02 Gaf Corp Ester-based lubricating oils containing polyalkyleneoxide-phosphate esters
US3329265A (en) * 1964-08-18 1967-07-04 James S Browning Flotation of mica
US3480143A (en) * 1965-03-28 1969-11-25 Chem & Phosphates Ltd Flotation of siliceous ores
US3462013A (en) * 1967-07-19 1969-08-19 Engelhard Min & Chem Method for beneficiating clay by flotation of colored impurities

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4097372A (en) * 1974-10-08 1978-06-27 Anglo-American Clays Corporation Method for improving clay brightness utilizing magnetic separation
US4098688A (en) * 1976-07-21 1978-07-04 Anglo-American Clays Corporation Brightening of clay by froth flotation
US4324653A (en) * 1979-12-17 1982-04-13 Bureau De Recherches Geologiques Et Minieres Process for the treatment of phosphate ores with silico-carbonate gangue
WO1984001114A1 (en) * 1982-09-13 1984-03-29 Anglo American Clays Corp Beneficiation of clays by froth flotation
US4518491A (en) * 1982-09-13 1985-05-21 Anglo-American Clays Corporation Beneficiation of clays by froth flotation
US4744892A (en) * 1985-02-27 1988-05-17 Henkel Kommanditgesellschaft Auf Aktien Process for dressing kaolinite by flotation
FR2700976A1 (en) * 1993-02-04 1994-08-05 Mircal Process for the recovery of micas by flotation and micas thus obtained
US5439116A (en) * 1993-02-04 1995-08-08 Mircal Process for the recovery of micas by flotation and micas thus obtained
WO2002089991A2 (en) * 2001-05-02 2002-11-14 Ge Betz, Inc. Mineral ore flotation aid
US6536595B2 (en) * 2001-05-02 2003-03-25 Ge Betz, Inc. Mineral ore flotation aid
WO2002089991A3 (en) * 2001-05-02 2008-01-17 Ge Betz Inc Mineral ore flotation aid
WO2020157106A1 (en) * 2019-02-01 2020-08-06 Basf Se Mixture of fatty acids and alkylether phosphates as a collector for phosphate ore flotation

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Owner name: ENGLEHARD CORPORATION A CORP. OF DE., NEW JERSE

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:PHIBRO CORPORATION;REEL/FRAME:003981/0436

Effective date: 19810518

AS Assignment

Owner name: PHIBRO CORPORATION

Free format text: CHANGE OF NAME;ASSIGNOR:ENGELHARD MINERALS & CHEMICALS CORPORATION;REEL/FRAME:004140/0512

Effective date: 19830328