USRE32875E - Process for the froth-flotation of a phosphate mineral from a phosphate-carbonate ore - Google Patents

Process for the froth-flotation of a phosphate mineral from a phosphate-carbonate ore Download PDF

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USRE32875E
USRE32875E US07/154,568 US15456888A USRE32875E US RE32875 E USRE32875 E US RE32875E US 15456888 A US15456888 A US 15456888A US RE32875 E USRE32875 E US RE32875E
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phosphate
phenol
flotation
minerals
resol
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US07/154,568
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Esko T. Kari
Jarmo Aaltonen
Elias U. Suokas
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Kemira Oyj
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Kemira Oyj
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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
    • B03D1/021—Froth-flotation processes for treatment of phosphate ores
    • 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
    • B03D1/016—Macromolecular compounds
    • 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
    • B03D1/008—Organic compounds containing oxygen
    • 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
    • B03D1/01—Organic compounds containing nitrogen
    • 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
    • B03D2203/06—Phosphate ores

Definitions

  • the present invention relates to a process for separating phosphate minerals from a phosphate ore, especially from a phosphate-carbonate ore, by flotation in the presence of a collector agent.
  • the slurry is treated with an alkali in order to remove the collector-agent covers from the mineral surfaces, and finally the combined concentrate is floated by using a cationic collector agent, especially an amine-type collector agent, the pH being neutral or mildly acidic, in order that the phosphate concentrate be separated in as pure a form as possible.
  • a cationic collector agent especially an amine-type collector agent, the pH being neutral or mildly acidic, in order that the phosphate concentrate be separated in as pure a form as possible.
  • an amphoteric surface-active agent to be used as a collector agent.
  • Such an agent has been obtained, for example, by allowing a suitable amino compound, e.g. methyl alanine or methyl glycine, to react with an epoxy or chlorohydrin compound.
  • a suitable amino compound e.g. methyl alanine or methyl glycine
  • the hydrophilic and hydrophobic portions of the collector agent can, in this as in other known amphoteric agents, be varied by adjusting the length of the carbon chain and, for example, the number of ether bonds.
  • a collector agent composition which is based on a monoester of sulfosuccinic acid and a fatty acid based on a vegetable or animal oil, the contents of the constituents in the composition ranging from 1-99% to 99-1%, calculated according to weight.
  • fatty acids are perhaps the most commonly used collector agents.
  • the fatty acids may be unsaturated or, for example, technical fatty acid compositions.
  • regulating chemicals are often also used in flotation. By using additives it is often also possible to decrease the total consumption of chemicals and/or the costs.
  • Generally known regulating chemicals include waterglass, corn starch, gum arabic, carboxymethylcellulose, neutral oil, carbon or sulfur dioxide gas, and various emulsifiers and frothers.
  • the known processes and chemicals have the disadvantage that the grade of the phosphate concentrate usually remains low when the aim is a high recovery, especially as carbonate minerals float along with phosphates.
  • the object of the present invention is to provide a process by means of which phosphate minerals such as apatite can be separated effectively and selectively from other minerals. According to the present invention it has surprisingly been discovered that a synergistic action is achieved when a phenol polymer is used in addition to a collector agent in the flotation, the recovery and selectivity being thereby improved, especially as regards carbonate minerals.
  • phenol-formaldehyde copolymers such as resol, novolak and modified phenol polymers, for example a melamine-modified novolak.
  • Resol and novolak are synthetic polymers where the frame structure, the distances between functional groups and the proportion of the components can be regulated relatively freely. According to A. A. K. Whitehouse, E. G. K. Pritchett and G. Barnett, Phenolic Resins, 1967, Iliffe Books Ltd., London, pp. 6-91, especially p. 7, these can be defined as follows, for example:
  • Resol is a synthetic resin which is made from phenol and aldehyde. Its molecule contains reactive methylol groups or substituted methylol groups.
  • Novolak is a soluble, easily melting synthetic phenolic resin which does not contain reactive methylol groups or substituted methylol groups.
  • novolak can be prepared from phenol and formaldehyde in the presence of, for example, an acid catalyst.
  • the acid catalytic formation of methylol phenols is a relatively slow process, but the condensation of methylol phenol with phenols to dihydroxy diphenyl methane is rapid. Therefore the latter compounds are prevalent in novolaks, Equation (1). ##STR1##
  • Novolaks proper are compositions of isomeric polynuclear phenol chains such as the above. Some amount of unreacted phenol is always left in the reaction mixture.
  • methylol phenols which contain reactive methylol groups condense further either together with other methylol groups, thereby forming ether bonds, or more commonly with the reactive atoms (in the ortho- or the para-position) of the benzene ring, thereby forming methylene bridges such as those in novolaks. In both cases, water breaks off in the reaction.
  • Resols may, for example, have on average three to four benzene rings, and the following can be mentioned as an example ##STR4##
  • phenol polymers of this type When phenol polymers of this type are used in flotation, selectivity, concentrate purity and recovery, as well as the quality of the froth, improve.
  • the use of phenol polymers enables conventional non-selective collector agents, such as fatty acids, amino acids and sulfonic acids, and mixtures of the same, to be used effectively.
  • In flotation it is possible to use common regulating agents known in the art, such as depressing agents, emulsifiers, dispersing agents, and frothing oils.
  • the conventional physical conditions such as the temperature and the pH of the slurry are also regulated in the known manner in the flotation process.
  • the ground material was slurried into 3 liters water, and resol was added to the slurry at a rate of 125 g/t, tall oil fatty acid at 50 g/t, and triethoxy butane (TEB) at 10 g/t, and the slurry was conditioned for 10 minutes. Thereafter, a rougher flotation was carried out in a 3-liter cell, and the obtained rougher concentrate was subjected to three cleaner flotations in a 1.5-liter cell, whereby the following results were obtained.
  • TEB triethoxy

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  • Life Sciences & Earth Sciences (AREA)
  • Environmental & Geological Engineering (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Geology (AREA)
  • Emulsifying, Dispersing, Foam-Producing Or Wetting Agents (AREA)
  • Manufacture And Refinement Of Metals (AREA)
  • Separation Of Suspended Particles By Flocculating Agents (AREA)

Abstract

A process for the separation of phosphate minerals from a phosphate-carbonate ore, by flotation, wherein a phenol polymer such as a resol or a novolak, which improves the yield and selectivity of the phosphate minerals with respect to the carbonate minerals, is used in addition to a collector agent in the flotation.

Description

BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a process for separating phosphate minerals from a phosphate ore, especially from a phosphate-carbonate ore, by flotation in the presence of a collector agent.
2. Description of the Prior Art
In the art, a large number of processes and compounds are known for seclective froth-flotation of phosphate minerals from ores which contain phosphate. One such process is presented in Finnish Patent Application No. 811333, wherein an anionic collector agent, usually a fatty acid, is first added to an aqueous slurry of the ore or of its concentrate, whereafter the slurry is subjected to flotation in order to remove a silicate-containing waste from the concentrate. Next the slurry is treated with an alkali in order to remove the collector-agent covers from the mineral surfaces, and finally the combined concentrate is floated by using a cationic collector agent, especially an amine-type collector agent, the pH being neutral or mildly acidic, in order that the phosphate concentrate be separated in as pure a form as possible.
From Finnish Patent Application No. 790725 there is also known an amphoteric surface-active agent to be used as a collector agent. Such an agent has been obtained, for example, by allowing a suitable amino compound, e.g. methyl alanine or methyl glycine, to react with an epoxy or chlorohydrin compound. In order to obtain the best result, the hydrophilic and hydrophobic portions of the collector agent can, in this as in other known amphoteric agents, be varied by adjusting the length of the carbon chain and, for example, the number of ether bonds.
Furthermore, from Finnish Patent Application No. 783804 there is known a collector agent composition which is based on a monoester of sulfosuccinic acid and a fatty acid based on a vegetable or animal oil, the contents of the constituents in the composition ranging from 1-99% to 99-1%, calculated according to weight.
At present, fatty acids are perhaps the most commonly used collector agents. The fatty acids may be unsaturated or, for example, technical fatty acid compositions. There are also other compounds among the proposed collector agents, such as alkyl benzene sulfonate, alkyl sulfate, and amines.
In order to enchance the selectivity of the separation of phosphate and carbonate minerals, and in order to improve the yield, various regulating chemicals are often also used in flotation. By using additives it is often also possible to decrease the total consumption of chemicals and/or the costs. Generally known regulating chemicals include waterglass, corn starch, gum arabic, carboxymethylcellulose, neutral oil, carbon or sulfur dioxide gas, and various emulsifiers and frothers. The known processes and chemicals have the disadvantage that the grade of the phosphate concentrate usually remains low when the aim is a high recovery, especially as carbonate minerals float along with phosphates.
SUMMARY OF THE INVENTION
The object of the present invention is to provide a process by means of which phosphate minerals such as apatite can be separated effectively and selectively from other minerals. According to the present invention it has surprisingly been discovered that a synergistic action is achieved when a phenol polymer is used in addition to a collector agent in the flotation, the recovery and selectivity being thereby improved, especially as regards carbonate minerals.
Recommended agents according to the invention, increasing the selectivity, are various phenol-formaldehyde copolymers, such as resol, novolak and modified phenol polymers, for example a melamine-modified novolak.
Resol and novolak are synthetic polymers where the frame structure, the distances between functional groups and the proportion of the components can be regulated relatively freely. According to A. A. K. Whitehouse, E. G. K. Pritchett and G. Barnett, Phenolic Resins, 1967, Iliffe Books Ltd., London, pp. 6-91, especially p. 7, these can be defined as follows, for example:
Resol is a synthetic resin which is made from phenol and aldehyde. Its molecule contains reactive methylol groups or substituted methylol groups.
Novolak is a soluble, easily melting synthetic phenolic resin which does not contain reactive methylol groups or substituted methylol groups.
According to the literature, novolak can be prepared from phenol and formaldehyde in the presence of, for example, an acid catalyst. The acid catalytic formation of methylol phenols is a relatively slow process, but the condensation of methylol phenol with phenols to dihydroxy diphenyl methane is rapid. Therefore the latter compounds are prevalent in novolaks, Equation (1). ##STR1##
The above reaction can continue further, whereby polynuclear phenolic chains are formed, of which we can mention the following ##STR2##
Novolaks proper are compositions of isomeric polynuclear phenol chains such as the above. Some amount of unreacted phenol is always left in the reaction mixture.
It is stated in the literature that resol can be prepared from phenol and formaldehyde in the presence of, for example, an alkali catalyst. The alkali-catalytic addition reaction of phenol and formaldehyde is more rapid than the condensation reaction following it. From this it follows that methylol phenols are prevalent intermediate products, Equation (2). ##STR3##
The methylol phenols which contain reactive methylol groups condense further either together with other methylol groups, thereby forming ether bonds, or more commonly with the reactive atoms (in the ortho- or the para-position) of the benzene ring, thereby forming methylene bridges such as those in novolaks. In both cases, water breaks off in the reaction.
Resols may, for example, have on average three to four benzene rings, and the following can be mentioned as an example ##STR4##
In addition to water, there may also be phenol, methylol phenols and formaldehyde polymers present as residues in resol.
When phenol polymers of this type are used in flotation, selectivity, concentrate purity and recovery, as well as the quality of the froth, improve. The use of phenol polymers enables conventional non-selective collector agents, such as fatty acids, amino acids and sulfonic acids, and mixtures of the same, to be used effectively. In flotation it is possible to use common regulating agents known in the art, such as depressing agents, emulsifiers, dispersing agents, and frothing oils. The conventional physical conditions such as the temperature and the pH of the slurry are also regulated in the known manner in the flotation process.
DESCRIPTION OF THE PREFERRED EMBODIMENT
The invention is illustrated below with the aid of examples.
Example 1
A phosphate-carbonate ore which contained 6.9% fluorapatite and 30.8% carbonates, the balance being silicate minerals, was crushed to a particle size under 3 mm. A one kg batch of the homogenized ore was ground with 0.7 liters water to a fineness of 37%--74 μm i.e., about 37% by weight of the homogenized ore has a particle size less than 74 microns. The ground material was slurried into 3 liters water, and resol was added to the slurry at a rate of 125 g/t, tall oil fatty acid at 50 g/t, and triethoxy butane (TEB) at 10 g/t, and the slurry was conditioned for 10 minutes. Thereafter, a rougher flotation was carried out in a 3-liter cell, and the obtained rougher concentrate was subjected to three cleaner flotations in a 1.5-liter cell, whereby the following results were obtained.
______________________________________                                    
               % P.sub.2 O.sub.5                                          
                      Recovery, %                                         
______________________________________                                    
Ore               4.0                                                     
Apatite concentrate                                                       
                 35.9     80.6                                            
______________________________________
By the procedure presented in Example 1, but by varying the chemicals used and/or their amounts, the following results were obtained.
__________________________________________________________________________
Example                                                                   
      Collector                                                           
             Frother.sup.a   Apatite concentrate                          
No.   agent                                                               
          (g/t)                                                           
             (g/t)                                                        
                  Phenol polymer                                          
                          (g/t)                                           
                             % P.sub.2 O.sub.5                            
                                  Recovery, %                             
__________________________________________________________________________
1     TFA.sup.b                                                           
           50                                                             
             10   Resol   125                                             
                             35.9 80.6                                    
2, control                                                                
      "    50                                                             
             10   --         28.7 78.3                                    
3     "   100                                                             
             10   Resol   250                                             
                             28.4 83.2                                    
4     "   100                                                             
             10   Resol   350                                             
                             35.8 81.3                                    
5     PS.sup.c                                                            
          250                                                             
             10   Resol   200                                             
                             35.7 84.9                                    
6, control                                                                
      "   250                                                             
             10   --         18.4 63.7                                    
7     "   100                                                             
             10   Melamine-                                               
                          150                                             
                             39.2 82.3                                    
                  modified                                                
                  novolak                                                 
8     "   250                                                             
             --   Novolak  50                                             
                             30.2 93.9                                    
9, control                                                                
      "   250                                                             
             --   --         25.5 61.9                                    
10, control                                                               
      AA.sup.d                                                            
          200                                                             
             --   --         26.5 85.2                                    
11, control                                                               
      "   400                                                             
             --   --         31.2 81.0                                    
12    "   200                                                             
             --   Resol   200                                             
                             36.4 85.0                                    
__________________________________________________________________________
 .sup.a Triethoxy butane (TEB) or other                                   
 .sup.b Tall oil fatty acid                                               
 .sup.c Petroleum sulfonate                                               
 .sup.d Aminoacid

Claims (8)

What is claimed is:
1. A process for the separation of phosphate minerals from a phosphate-carbonate ore comprising froth flotation of the phosphate minerals in the presence of a collector agent and a phenol polymer wherein said phenol polymer improves the selectivity of said process for phosphate minerals.
2. The process of claim 1 wherein said phenol polymer is a phenol-formaldehyde copolymer.
3. The process of claim 2 wherein said phenol-formaldehyde copolymer is selected from the group consisting of resols, novolaks and melamine modified phenol polymers.
4. The process of claim 3 wherein said modified phenol polymer is a melamine-modified novolak.
5. The process of claim 3 wherein said collector agent is selected from the group consisting of fatty acids, amino acids, sulfonic acids and mixtures thereof.
6. The process of claim 5 wherein said phenol-formaldehyde copolymer is resol.
7. The process of claim 6 wherein said collector agent is a fatty acid.
8. The process of claim 7 wherein said recovered phosphate mineral is apatite.
US07/154,568 1984-10-11 1988-02-08 Process for the froth-flotation of a phosphate mineral from a phosphate-carbonate ore Expired - Fee Related USRE32875E (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI843991A FI71885C (en) 1984-10-11 1984-10-11 FOERFARANDE FOER FLOTATION AV ETT FOSFATMINERAL OCH ETT MEDEL AVSETT ATT ANVAENDAS DAERI.
FI843991 1984-10-11

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US07/154,568 Expired - Fee Related USRE32875E (en) 1984-10-11 1988-02-08 Process for the froth-flotation of a phosphate mineral from a phosphate-carbonate ore

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CN (1) CN85107440A (en)
BR (1) BR8505041A (en)
FI (1) FI71885C (en)
SU (1) SU1537126A3 (en)
ZA (1) ZA857286B (en)
ZW (1) ZW15385A1 (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20060151397A1 (en) * 2004-12-23 2006-07-13 Georgia-Pacific Resins, Inc. Amine-aldehyde resins and uses thereof in separation processes
US20060151360A1 (en) * 2004-12-23 2006-07-13 Georgia-Pacific Resins, Inc. Modified amine-aldehyde resins and uses thereof in separation processes
US20070000839A1 (en) * 2004-12-23 2007-01-04 Georgia-Pacific Resins, Inc. Modified amine-aldehyde resins and uses thereof in separation processes
US20070012630A1 (en) * 2004-12-23 2007-01-18 Georgia-Pacific Resins, Inc. Amine-aldehyde resins and uses thereof in separation processes
US20080017552A1 (en) * 2004-12-23 2008-01-24 Georgia-Pacific Chemicals Llc Modified amine-aldehyde resins and uses thereof in separation processes
US20080029460A1 (en) * 2004-12-23 2008-02-07 Georgia-Pacific Chemicals Llc. Amine-aldehyde resins and uses thereof in separation processes

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US5314073A (en) * 1993-05-03 1994-05-24 Eastman Kodak Company Phosphate flotation using sulfo-polyesters
US5858214A (en) * 1996-10-17 1999-01-12 Arr-Maz Products, L.P. Phosphate beneficiation process using polymers as slime flocculants
CN101128264B (en) * 2004-12-23 2013-05-29 佐治亚-太平洋化学有限责任公司 Modified amine-aldehyde resins and uses thereof in separation processes
JP5407994B2 (en) * 2009-08-11 2014-02-05 栗田工業株式会社 Water treatment method and water treatment flocculant
CN102240603B (en) * 2010-05-12 2014-08-13 北京君致清科技有限公司 Method for floatation of apatite using collector prepared from illegal cooking oils
CN103920596B (en) * 2014-04-25 2017-02-15 中蓝连海设计研究院 Collophanite combination flotation collector and preparation method and application thereof
CN104117220B (en) * 2014-07-04 2016-01-20 南开大学 A kind of foam fractionation purification process
US11638923B1 (en) 2020-09-10 2023-05-02 King Saud University Flotation reagents from acidic olive oil

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3403783A (en) * 1965-11-22 1968-10-01 Zuplatec A G Ges Fur Tech Plan Flotation of phosphate-containing materials
US3634230A (en) * 1969-08-06 1972-01-11 Reichhold Chemicals Inc Process for removal of inorganic and organic matter from waste water systems
US3974116A (en) * 1974-03-20 1976-08-10 Petrolite Corporation Emulsion suspensions and process for adding same to system
US4486301A (en) * 1983-08-22 1984-12-04 Tennessee Valley Authority Method of beneficiating high carbonate phosphate ore
US4545898A (en) * 1983-05-27 1985-10-08 Berol Kemi Ab Process for froth flotation

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3403783A (en) * 1965-11-22 1968-10-01 Zuplatec A G Ges Fur Tech Plan Flotation of phosphate-containing materials
US3634230A (en) * 1969-08-06 1972-01-11 Reichhold Chemicals Inc Process for removal of inorganic and organic matter from waste water systems
US3974116A (en) * 1974-03-20 1976-08-10 Petrolite Corporation Emulsion suspensions and process for adding same to system
US4545898A (en) * 1983-05-27 1985-10-08 Berol Kemi Ab Process for froth flotation
US4486301A (en) * 1983-08-22 1984-12-04 Tennessee Valley Authority Method of beneficiating high carbonate phosphate ore

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20060151397A1 (en) * 2004-12-23 2006-07-13 Georgia-Pacific Resins, Inc. Amine-aldehyde resins and uses thereof in separation processes
US20060151360A1 (en) * 2004-12-23 2006-07-13 Georgia-Pacific Resins, Inc. Modified amine-aldehyde resins and uses thereof in separation processes
US20070000839A1 (en) * 2004-12-23 2007-01-04 Georgia-Pacific Resins, Inc. Modified amine-aldehyde resins and uses thereof in separation processes
US20070012630A1 (en) * 2004-12-23 2007-01-18 Georgia-Pacific Resins, Inc. Amine-aldehyde resins and uses thereof in separation processes
US20080017552A1 (en) * 2004-12-23 2008-01-24 Georgia-Pacific Chemicals Llc Modified amine-aldehyde resins and uses thereof in separation processes
US20080029460A1 (en) * 2004-12-23 2008-02-07 Georgia-Pacific Chemicals Llc. Amine-aldehyde resins and uses thereof in separation processes
US7913852B2 (en) 2004-12-23 2011-03-29 Georgia-Pacific Chemicals Llc Modified amine-aldehyde resins and uses thereof in separation processes
US8011514B2 (en) 2004-12-23 2011-09-06 Georgia-Pacific Chemicals Llc Modified amine-aldehyde resins and uses thereof in separation processes
US8092686B2 (en) 2004-12-23 2012-01-10 Georgia-Pacific Chemicals Llc Modified amine-aldehyde resins and uses thereof in separation processes
US8127930B2 (en) 2004-12-23 2012-03-06 Georgia-Pacific Chemicals Llc Amine-aldehyde resins and uses thereof in separation processes
US8702993B2 (en) 2004-12-23 2014-04-22 Georgia-Pacific Chemicals Llc Amine-aldehyde resins and uses thereof in separation processes
US8757389B2 (en) 2004-12-23 2014-06-24 Georgia-Pacific Chemicals Llc Amine-aldehyde resins and uses thereof in separation processes
US10150839B2 (en) 2004-12-23 2018-12-11 Ingevity South Carolina, Llc Amine-aldehyde resins and uses thereof in separation processes

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Publication number Publication date
FI71885C (en) 1990-06-12
FI843991L (en) 1986-04-12
US4687571A (en) 1987-08-18
FI843991A0 (en) 1984-10-11
CN85107440A (en) 1986-04-10
ZA857286B (en) 1986-05-28
FI71885B (en) 1986-11-28
SU1537126A3 (en) 1990-01-15
BR8505041A (en) 1986-07-29
ZW15385A1 (en) 1986-02-19

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