GB2095131A - Low molecular weight copolymers as depressants in mineral ore flotation - Google Patents
Low molecular weight copolymers as depressants in mineral ore flotation Download PDFInfo
- Publication number
- GB2095131A GB2095131A GB8204784A GB8204784A GB2095131A GB 2095131 A GB2095131 A GB 2095131A GB 8204784 A GB8204784 A GB 8204784A GB 8204784 A GB8204784 A GB 8204784A GB 2095131 A GB2095131 A GB 2095131A
- Authority
- GB
- United Kingdom
- Prior art keywords
- depressant
- molecular weight
- depressants
- range
- flotation
- 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.)
- Withdrawn
Links
- 238000005188 flotation Methods 0.000 title claims abstract description 30
- 229920001577 copolymer Polymers 0.000 title claims abstract description 14
- 229910052500 inorganic mineral Inorganic materials 0.000 title claims abstract description 14
- 239000011707 mineral Substances 0.000 title claims abstract description 14
- 229920002472 Starch Polymers 0.000 claims abstract description 19
- 235000019698 starch Nutrition 0.000 claims abstract description 19
- 239000008107 starch Substances 0.000 claims abstract description 18
- 230000007062 hydrolysis Effects 0.000 claims abstract description 9
- 238000006460 hydrolysis reaction Methods 0.000 claims abstract description 9
- 230000000881 depressing effect Effects 0.000 claims abstract description 7
- 239000001257 hydrogen Substances 0.000 claims abstract description 6
- 229910052739 hydrogen Inorganic materials 0.000 claims abstract description 6
- 229910052783 alkali metal Inorganic materials 0.000 claims abstract description 4
- QGZKDVFQNNGYKY-UHFFFAOYSA-O Ammonium Chemical group [NH4+] QGZKDVFQNNGYKY-UHFFFAOYSA-O 0.000 claims abstract description 3
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims abstract description 3
- 150000001340 alkali metals Chemical group 0.000 claims abstract description 3
- 150000002431 hydrogen Chemical group 0.000 claims abstract description 3
- 230000000994 depressogenic effect Effects 0.000 claims description 27
- 238000000034 method Methods 0.000 claims description 20
- 239000004480 active ingredient Substances 0.000 claims description 5
- 229920002401 polyacrylamide Polymers 0.000 claims description 5
- 150000003839 salts Chemical class 0.000 claims description 3
- WCYWZMWISLQXQU-UHFFFAOYSA-N methyl Chemical compound [CH3] WCYWZMWISLQXQU-UHFFFAOYSA-N 0.000 claims description 2
- 239000000203 mixture Substances 0.000 claims description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 2
- 229920002907 Guar gum Polymers 0.000 claims 1
- 229960002154 guar gum Drugs 0.000 claims 1
- 235000010417 guar gum Nutrition 0.000 claims 1
- 239000000665 guar gum Substances 0.000 claims 1
- 238000011084 recovery Methods 0.000 abstract description 4
- 239000003795 chemical substances by application Substances 0.000 abstract description 3
- 229920001353 Dextrin Polymers 0.000 abstract description 2
- 239000004375 Dextrin Substances 0.000 abstract description 2
- UCKMPCXJQFINFW-UHFFFAOYSA-N Sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 abstract description 2
- 235000019425 dextrin Nutrition 0.000 abstract description 2
- 229920000591 gum Polymers 0.000 abstract 1
- 125000002496 methyl group Chemical group [H]C([H])([H])* 0.000 abstract 1
- 239000000463 material Substances 0.000 description 10
- 239000000243 solution Substances 0.000 description 9
- 239000003153 chemical reaction reagent Substances 0.000 description 8
- 238000002474 experimental method Methods 0.000 description 7
- 244000007835 Cyamopsis tetragonoloba Species 0.000 description 5
- 239000007787 solid Substances 0.000 description 5
- 238000012360 testing method Methods 0.000 description 5
- 239000012267 brine Substances 0.000 description 4
- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 description 4
- HPALAKNZSZLMCH-UHFFFAOYSA-M sodium;chloride;hydrate Chemical compound O.[Na+].[Cl-] HPALAKNZSZLMCH-UHFFFAOYSA-M 0.000 description 4
- 150000001412 amines Chemical class 0.000 description 3
- 238000003556 assay Methods 0.000 description 3
- 230000001143 conditioned effect Effects 0.000 description 3
- HRPVXLWXLXDGHG-UHFFFAOYSA-N Acrylamide Chemical compound NC(=O)C=C HRPVXLWXLXDGHG-UHFFFAOYSA-N 0.000 description 2
- 239000004215 Carbon black (E152) Substances 0.000 description 2
- 238000013019 agitation Methods 0.000 description 2
- 125000003368 amide group Chemical group 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 230000001580 bacterial effect Effects 0.000 description 2
- 239000012141 concentrate Substances 0.000 description 2
- 238000000354 decomposition reaction Methods 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 229930195733 hydrocarbon Natural products 0.000 description 2
- 150000002430 hydrocarbons Chemical class 0.000 description 2
- 239000005445 natural material Substances 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 239000002904 solvent Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 239000002351 wastewater Substances 0.000 description 2
- SMZOUWXMTYCWNB-UHFFFAOYSA-N 2-(2-methoxy-5-methylphenyl)ethanamine Chemical compound COC1=CC=C(C)C=C1CCN SMZOUWXMTYCWNB-UHFFFAOYSA-N 0.000 description 1
- NIXOWILDQLNWCW-UHFFFAOYSA-N 2-Propenoic acid Natural products OC(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 1
- WVYWICLMDOOCFB-UHFFFAOYSA-N 4-methyl-2-pentanol Chemical compound CC(C)CC(C)O WVYWICLMDOOCFB-UHFFFAOYSA-N 0.000 description 1
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 description 1
- CERQOIWHTDAKMF-UHFFFAOYSA-N Methacrylic acid Chemical compound CC(=C)C(O)=O CERQOIWHTDAKMF-UHFFFAOYSA-N 0.000 description 1
- 229920000881 Modified starch Polymers 0.000 description 1
- 239000004368 Modified starch Substances 0.000 description 1
- 230000003213 activating effect Effects 0.000 description 1
- -1 alkali metal salt Chemical class 0.000 description 1
- 235000011114 ammonium hydroxide Nutrition 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000003093 cationic surfactant Substances 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 230000009918 complex formation Effects 0.000 description 1
- 238000010411 cooking Methods 0.000 description 1
- 238000007334 copolymerization reaction Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 238000005189 flocculation Methods 0.000 description 1
- 230000016615 flocculation Effects 0.000 description 1
- 235000013305 food Nutrition 0.000 description 1
- 230000003301 hydrolyzing effect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 235000019426 modified starch Nutrition 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 229920002239 polyacrylonitrile Polymers 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 238000006116 polymerization reaction Methods 0.000 description 1
- 230000000379 polymerizing effect Effects 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 239000012142 reagent concentrate Substances 0.000 description 1
- HEMHJVSKTPXQMS-UHFFFAOYSA-M sodium hydroxide Inorganic materials [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
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
-
- 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
- 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
- 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
- B03D2201/00—Specified effects produced by the flotation agents
- B03D2201/06—Depressants
-
- 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
- B03D2203/10—Potassium ores
Landscapes
- Separation Of Suspended Particles By Flocculating Agents (AREA)
- Addition Polymer Or Copolymer, Post-Treatments, Or Chemical Modifications (AREA)
Abstract
Low molecular weight copolymers of the general structure: <IMAGE> where R1 and R2 are hydrogen or methyl, X is hydrogen, alkali metal or ammonium ion, and a, m and n are such that the degree of hydrolysis is from 5 to 66% and the total molecular weight of the copolymer is between 200 and 85,000, are used to depress sylvinite minerals in a flotation system. These copolymers can be combined with other known depressing agents for non-sulfide ores, such as starch, dextrin, gum and the like, to obtain equivalent or improved selectivity and recovery than would be obtained using these depressants alone. <IMAGE>
Description
SPECIFICATION
Low molecular weight copolymers as depressants in mineral ore flotation
Background of the invention
In mineral ore flotation, depression comprises steps taken to prevent the flotation of a particular mineral. In one-mineral flotation systems, it is commonly practiced to hold down both the gangue materials and low-assay middlings. In differential flotation systems, it is used to hold back one or more of the materials normally flotable by a given collector.
Depression is conventionally accomplished through the use of reagents known as depressing agents or, more commonly, depressants. When added to the flotation systems, the depressing agents exert a specific action upon the material to be depressed thereby preventing that material from floating.
The exact mode of this action remains open to speculation. Various theories have been put forth to explain this action; some of which include: that the depressants react chemically with the mineral surface to produce insoluble protective films of a wettable nature which fail to react with collectors; that the depressants by various physical-chemical mechanisms, such as surface adsorption, massaction effects, complex formation, or the like, prevent the formation of the collector film; that the depressants act as solvents for an activating film naturally associated with the mineral; that the depressants act as solvents for the collecting film; and the like. These theories appear closely related and the correct theory may ultimately prove to involve elements from several, if not all, of them.
Currently, non-sulfide flotation systems have utilized depressants derived from natural substances such as starches, dextrins, gums and the like. See U.S. Patent No. 3,292,780 to Frommer et al. and U.S. Patent No. 3,371,778 to Iwasaki. However, from an ecological vantage point, the presence of residual depressants such as these in the waste waters increase the biodegradeable oxygen demand and the chemical oxygen demand, thereby creating a pollution problem in the disposal of these waste waters. From a commercial vantage point, there are an ever-increasing number of countries in which use of reagents having a food value, such as starch, is prohibited in commercial applications.Furthermore, the starch-type depressants require a complex preparation of the reagent solution involving a cooking stage prior to solution and the resultant reagent is susceptible to bacterial decomposition thereby requiring storage monitoring.
Accordingly, there exists the need for a synthetic depressant which can at once overcome the drawbacks of the conventional depressants currently utilized and yet perform in an equivalent or superior manner.
Summary of the invention
The present invention provides a process for depressing sylvinite minerals in a flotation system.
The process comprises adding to the flotation system, as a selective depressant, an effective amount of a low molecular weight copolymer or water-soluble salts thereof of the general structure:
wherein R1 and R2 are individually hydrogen or a methyl radical, X is hydrogen, alkali metal or ammonium ion, n and m are whole numbers such that the degree of hydrolysis is within the range from 5 to 6% and n, m and a have a numerical value such that the total molecular weight of the polymer or copolymer is within the range from 200 to 85,000. The process of the instant invention depresses sylvinite minerals as well as comparable processes employing depressants derived from natural substances, such as starch, at approximately one-tenth the dosage, calculated on active ingredient of depressant.The instant process, besides overcoming the deficiencies attributable to employing nonsynthetic depressants as set forth earlier, does not result in flocculation of the depressed mineral values.
Detailed description of the invention
In accordance with the instant invention there is provided a process for depressing sylvinite minerals in a flotation system. The process comprises adding to the flotation system a synthetic depressant during the flotation stage. The synthetic depressant employed in this process is a low molecular weight copolymer of general structure I. The molecular weight of the synthetic depressant should be within the range from 200 to 85,000 and preferably within the range from 7,000 to 85,000.
The degree of hydrolysis of the synthetic depressant should be from 5% to 66%, preferably from 20% to 55%, and more preferably, from 40 to 45%. The hydrolyzed polyacrylamide can be prepared by first polymerizing acrylamide and then hydrolyzing some of the amide groups, or concurrent polymerization and hydrolysis or it may be made by other means, including copolymerization of acrylic acid or methacrylic acid and acrylamide, or hydrolysis of polyacrylonitrile, etc. In any event, there are the proper proportions of amide groups and the remainder being carboxyl groups, usually in the form of an alkali metal salt. The term hydrolyzed polyacrylamide is used as convenient understandable terminology rather than to limit the process of manufacture.Reagents wihch have been found particularly useful for hydrolysis include Na0H, KOH and NH4OH.
The resulting low-molecular weight copolymer when employed as a depressant in the flotation system has exhibited improved selectivity and recovery over conventional depressants at substantially lower dosages of depressant. The synthetic depressant is easily diluted with water to provide a reagent solution that, due to its non-susceptibility to bacterial decomposition, can be stored almost indefinitely.
The synthetic depressants should be added in an effective amount to obtain the desired degree of depression. Although this amount will vary depending upon the ore being processed, the flotation collector being employed, and other variables, it is generally on the order of 0.01 to 0.20 pound of depressant calculated on active ingredient per long ton of ore. This value is from one-sixth to onefourth that dosage normally required to obtain equivalent recovery with starch depressants.
Additionally, the instant process is capable of employing a combination of the synthetic depressants with a conventional, naturally derived depressant, such as starch, modified starch derivatives, and guar gums to arrive at substantially equivalent or improved performance to that obtained when employing the conventional depressant alone.
The following specific examples illustrate certain aspects of the present invention and, more particularly, point out methods of evaluating the process for depressing sylvinite minerals in a flotation system. However, the examples are set forth for illustration only and are not to be construed as limitations on the present invention except as set forth in the appended claims. All parts and percentages are by weight unless otherwise specified.
Experimental procedure I Step 1: Scrub two separate samples each of 800 parts of sylvinite in 370 parts of a brine solution for two minutes at 800 r.p.m. and thereafter combine the two samples into one containing at least 1 600 parts of sylvinite.
Step 2:
Condition the sample of Step 1 in a flotation cell at 1 400 r.p.m. with 20 parts of a nonionic polyacrylamide flocculant for 1 5 seconds and 2 parts of a cationic surfactant collector for 1 5 additional seconds.
Step 3:
Transfer the sample of Step 2 to a flotation bowl. Flotation is then conducted for two minutes at 1 600 r.p.m. which results in a slime froth and underflow. The underflow portion is screened on a 20 mesh screen resulting in +20 mesh and -20 mesh fractions.
Step 4:
The +20 mesh portion of Step 3 is conditioned at 800 r.p.m. with 8 parts of starch for 15 seconds followed by 10 parts of an amine for 1 5 seconds and 4 drops of a hydrocarbon oil for 1 5 more seconds.
Step 5: The -20 mesh portion of Step 3 is conditioned at 1100 r.p.m. with 8 parts of starch for 30 seconds followed by 5 parts of an amine for 30 seconds.
Step 6:
The +20 and -20 mesh portions are recombined in a flotation cell and conditioned at 1100 r.p.m. with 2 drops of a frother for 1 5 seconds. Flotation is conducted at 1400 r.p.m. for two minutes resulting in a concentrate and a tail.
Comparative example A
The Experimental Procedure set forth above is followed in every material detail employing as the depressant 0.52 pound of dry starch per long ton of sylvinite in the flotation steps. Test results are set forth in Table I.
Example 1
The Experimental Procedure set forth above is followed in every material detail employing as the depressant 0.52 pound of a 45% hydrolyzed polyacrylamide solution (12.3% active) having a molecular weight of 30,000 per long ton of sylvinite in place of the starch used during the flotation steps. Test
results are set forth in Table I.
Examples 2-5
The Experimental Procedure set forth above is followed in every material detail employing 0.26 pound of a copolymer depressant solution (46.055.3% active) per long ton of sylvinite in place of the starch used during the flotation steps. Test results and details are set forth in Table I.
Table
Evaluation of synthetic depressants
Reagents Assays Conc. Distribution Conc.
Example % COOH MWt. % Solids K20 Insol. K20
Comp. A None Starch 100.0 55.3 2.8 72.7
1 45 30,000 12.3 55.4 2.7 70.7
2 43 7,000 55.3 57.7 2.2 68.4
3 66 7,000 55.3 55.7 3.2 68.5
4 45 2,500 46.0 56.2 4.4 54.9
5 23 7,000 54.8 54.5 3.0 71.7
Examples 6-19 The Experimental Procedure set forth above is followed in every material detail employing as the depressant those materials detailed in Table II. The dosage listed in Table II is calculated on synthetic depressant solutions, having active ingredients range from 25.0 to 27.7%, whereas the starch is based on solid starch. Test results are set forth in Table II as well.
Table II
Reagents Assays Conc. Distribution Conc.
(Ib/ton) Example % COOH MWt. % Solids Dosage K20 Insol. K20
Comp. B None Starch 100.0 0.396 57.9 1.2 74.70
6 45 32,000 26.6 0.198 59.0 0.8 78.48
Comp. C None Starch 100.0 0.242 54.4 1.8 68.92
Comp. D None Starch 100.0 0.363 55.5 1.7 73.62
7 45 32,000 26.6 0.182 55.5 2.0 71.44
8 45 68,000 26.0 0.182 54.0 1.8 73.68
Comp. E 45 200,000 22.7 0.182 53.8 1.7 71.38
9 45 32,000 26.6 0.091 56.9 2.1 64.22
10 25 68,000 25.0 0.182 55.4 3.6 71.55
11 45 68,000 26.0 0.182 55.8 4.7 76.40
12 66 68,000 25.0 0.182 55.1 4.8 62.28
13 25 32,000 26.5 0.182 56.3 5.5 73.2
14 66 32,000 27.7 0.182 57.2 4.0 67.58
Comp.F None Starch 100.0 0.330 57.1 2.6 70.96
15 45 68,000 26.0 0.165 52.9 3.6 67.75
16 45 68,000 26.0 0.111 53.7 3.6 69.15
17 45 68,000 26.0 0.054 56.2 3.7 66.95
18 45 32,000 26.6 0.165 54.6 2.8 80.65
19 45 32,000 26.6 0.111 53.8 3.6 69.92
Experimental procedure II
800 Parts of sylvinite are placed in a flotation cell which is then filled to the lip with a brine solution. The sylvinite is scrubbed for 5 minutes and thereafter transferred to a 5 liter cylinder where it is stirred for 1 minute and allowed to settle for an additional minute. The slimes are decanted to within 1/2 inch of the settled sylvinite.
The sylvinite is combined with 300 parts of brine. 0.34 Pound per ton of guar is mixed in and then agitated for 1 0-20 seconds. Next 0.10 pound per ton of an amine collector is mixed and thereafter agitated for 10 seconds. To this is then added 4 drops of a hydrocarbon oil followed by 5 seconds of agitation and finally 4 drops of methyl isobutyl carbinol followed by 5 seconds of agitation.
The mixture is transferred to a flotation cell and filled to the lip with brine. A two-minute float follows: The concentrate is dried and weighed.
Examples 20-23 The Experimental Procedure II set forth above is followed in every material detail employing a copolymer depressant in the flotation step in place of guar. The dosage listed in Table Ill is calculated on synthetic depressant solutions, having active ingredients range from 26.0 to 26.6%, whereas the guar is based on solid guar. Test results are detailed in Table Ill.
Table Ill
Reagent Concentrate (#/ton) Example % COOH MWt. % Solids Dosage % K20 Insol. % K20 Recovery
20 45 7,000 55.3 0.19 55.84 1.22 41.0
21 45 32,000 26.6 0.18 54.87 1.38 57.9
22 45 68,000 26.0 0.18 54.41 1.59 58.7
23 45 68,000 26.0 0.09 53.05 1.76 54.7
Comp. G Guar 0.34 53.56 1.21 59.0
Claims (8)
1. A process for depressing sylvinite minerals in a flotation system which comprises adding to the flotation system, as a selective depressant, an effective amount of a copolymer or water soluble salts thereof of the general structure:
wherein R, and R2 are individually hydrogen or a methyl radical, X is a hydrogen, alkali metal or ammonium ion, n and m are whole numbers such that the degree of hydrolysis is within the range from 5 to 66% and n, m and a have a numerical value such that the total molecular weight of copolymer is within the range from 200 to 85,000.
2. The process of Claim 1 wherein the molecular weight is within the range from 7,000 to 85,000.
3. The process of Claim 1 wherein the degree of hydrolysis is within the range from 20% to 66%.
4. The process of Claim 3 wherein the degree of hydrolysis is within the range from 40 to 45%.
5. The process of Claim 1 wherein said depressant is a mixture of a naturally derived depressant and said copolymer or water-soluble salt thereof.
6. The process of Claim 5 wherein said naturally derived depressants selected from the group consisting of starch and guar gum.
7. The process of Claim 1 wherein said synthetic depressant is a 45% hydrolyzed polyacrylamide having a molecular weight on the order of 45,000.
8. The process of Claim 1 wherein the effective amount of the active ingredient of synthetic depressant is 0.01 to 0.20 pound per long ton of sylvinite ore.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US24652181A | 1981-03-23 | 1981-03-23 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB2095131A true GB2095131A (en) | 1982-09-29 |
Family
ID=22931033
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB8204784A Withdrawn GB2095131A (en) | 1981-03-23 | 1982-02-18 | Low molecular weight copolymers as depressants in mineral ore flotation |
Country Status (6)
| Country | Link |
|---|---|
| AU (1) | AU548246B2 (en) |
| DE (1) | DE3210633A1 (en) |
| ES (1) | ES510640A0 (en) |
| FR (1) | FR2502028A1 (en) |
| GB (1) | GB2095131A (en) |
| SE (1) | SE8201816L (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AU669917B2 (en) * | 1992-08-24 | 1996-06-27 | Life-Air (Pty) Ltd | Breathing apparatus |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2525494A1 (en) * | 1982-04-26 | 1983-10-28 | American Cyanamid Co | SYLVITY CONCENTRATION PROCESS IN A SYLVINITE ORE FLOTATION SYSTEM |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2740522A (en) * | 1953-04-07 | 1956-04-03 | American Cyanamid Co | Flotation of ores using addition polymers as depressants |
| DE1267631B (en) * | 1967-08-16 | 1968-05-09 | August Rosterg Haus | Process for the flotation of potash crude salts containing clay and other insoluble solids |
| US3805951A (en) * | 1972-04-07 | 1974-04-23 | American Cyanamid Co | Selective flocculation and flotation of slimes from sylvinite ores |
| GB1452605A (en) * | 1973-03-01 | 1976-10-13 | Allied Colloids Ltd | Materials and processes for flotation of mineral substances |
| AU5856080A (en) * | 1979-06-01 | 1980-12-04 | Calgon Corporation | Flotation circuit additive |
| US4289613A (en) * | 1979-11-19 | 1981-09-15 | American Cyanamid Company | Low molecular weight hydrolyzed polymers or copolymers as depressants in mineral ore flotation |
-
1982
- 1982-02-18 GB GB8204784A patent/GB2095131A/en not_active Withdrawn
- 1982-03-15 FR FR8204322A patent/FR2502028A1/en not_active Withdrawn
- 1982-03-22 SE SE8201816A patent/SE8201816L/en not_active Application Discontinuation
- 1982-03-22 AU AU81758/82A patent/AU548246B2/en not_active Ceased
- 1982-03-22 ES ES510640A patent/ES510640A0/en active Granted
- 1982-03-23 DE DE19823210633 patent/DE3210633A1/en not_active Withdrawn
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AU669917B2 (en) * | 1992-08-24 | 1996-06-27 | Life-Air (Pty) Ltd | Breathing apparatus |
Also Published As
| Publication number | Publication date |
|---|---|
| DE3210633A1 (en) | 1982-10-28 |
| ES8306332A1 (en) | 1983-06-16 |
| ES510640A0 (en) | 1983-06-16 |
| AU548246B2 (en) | 1985-12-05 |
| SE8201816L (en) | 1982-09-24 |
| AU8175882A (en) | 1982-09-30 |
| FR2502028A1 (en) | 1982-09-24 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US4360425A (en) | Low molecular weight copolymers and terpolymers as depressants in mineral ore flotation | |
| CA1157585A (en) | Crosslinked starches as depressants in mineral ore flotation | |
| US4289613A (en) | Low molecular weight hydrolyzed polymers or copolymers as depressants in mineral ore flotation | |
| EP0662865A1 (en) | Coal flotation process. | |
| US4141691A (en) | Use of water soluble polymers in coal flotation circuits | |
| US4902764A (en) | Polymeric sulfide mineral depressants | |
| US4533465A (en) | Low molecular weight copolymers as depressants in sylvinite ore flotation | |
| GB2095131A (en) | Low molecular weight copolymers as depressants in mineral ore flotation | |
| CA2222996C (en) | Method of depressing non-sulfide silicate gangue minerals | |
| AU606242B2 (en) | Flotation depressants | |
| CN1032744C (en) | Method for clarifying tailing water | |
| van Dolah et al. | The distribution of pelagic tars and plastics in the South Atlantic Bight | |
| Somasundaran et al. | Applications of biological processes in mineral processing | |
| US3933625A (en) | Electrical preconditioning in a selective flotation of sulfide ores | |
| Narvekar et al. | Behaviour of boron, calcium and magnesium in a polluted estuary | |
| US4157296A (en) | Flotation process for fluoride minerals | |
| CN106824544B (en) | Hematite reverse flotation inhibitor and use method thereof | |
| EP0830209B1 (en) | Method of depressing non-sulfide silicate gangue minerals | |
| Ludwig et al. | Evaluation of the standard elutriate test as an estimator of contaminant release at dredging sites | |
| CN114904661B (en) | Sphalerite inhibitor for lead-zinc sulfide ore flotation separation process, application of sphalerite inhibitor and lead-zinc sulfide ore flotation separation method | |
| US2766883A (en) | Process of deoiling phosphate concentrate by means of finely divided solids | |
| Paillès et al. | Effect of experimental conditions on phosphorus extracted from estuarine and marine sediments | |
| US2416909A (en) | Froth flotation of phosphate ore | |
| Hammerton et al. | The design and interpretation of marine pollution surveys | |
| AU663411C (en) | Coal flotation process |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| WAP | Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1) |