CN114247567A - Collecting agent for synchronously collecting siliceous and magnesian minerals and preparation method and application thereof - Google Patents
Collecting agent for synchronously collecting siliceous and magnesian minerals and preparation method and application thereof Download PDFInfo
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- CN114247567A CN114247567A CN202111601829.3A CN202111601829A CN114247567A CN 114247567 A CN114247567 A CN 114247567A CN 202111601829 A CN202111601829 A CN 202111601829A CN 114247567 A CN114247567 A CN 114247567A
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- dodecyl
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- 239000003795 chemical substances by application Substances 0.000 title claims abstract description 67
- 229910052500 inorganic mineral Inorganic materials 0.000 title claims abstract description 55
- 239000011707 mineral Substances 0.000 title claims abstract description 55
- 238000002360 preparation method Methods 0.000 title claims abstract description 27
- 238000005188 flotation Methods 0.000 claims abstract description 63
- 150000002191 fatty alcohols Chemical class 0.000 claims abstract description 51
- DHMQDGOQFOQNFH-UHFFFAOYSA-M Aminoacetate Chemical compound NCC([O-])=O DHMQDGOQFOQNFH-UHFFFAOYSA-M 0.000 claims abstract description 31
- -1 (octa-octadecyl) trimethyl benzyl ammonium chloride Chemical compound 0.000 claims abstract description 18
- 239000002367 phosphate rock Substances 0.000 claims abstract description 17
- OJMIONKXNSYLSR-UHFFFAOYSA-N phosphorous acid Chemical compound OP(O)O OJMIONKXNSYLSR-UHFFFAOYSA-N 0.000 claims abstract description 17
- 230000001360 synchronised effect Effects 0.000 claims abstract description 4
- MWKFXSUHUHTGQN-UHFFFAOYSA-N decan-1-ol Chemical compound CCCCCCCCCCO MWKFXSUHUHTGQN-UHFFFAOYSA-N 0.000 claims description 50
- 238000002156 mixing Methods 0.000 claims description 40
- KBPLFHHGFOOTCA-UHFFFAOYSA-N caprylic alcohol Natural products CCCCCCCCO KBPLFHHGFOOTCA-UHFFFAOYSA-N 0.000 claims description 38
- ZWRUINPWMLAQRD-UHFFFAOYSA-N nonan-1-ol Chemical compound CCCCCCCCCO ZWRUINPWMLAQRD-UHFFFAOYSA-N 0.000 claims description 38
- 238000003756 stirring Methods 0.000 claims description 36
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 33
- QDRKDTQENPPHOJ-UHFFFAOYSA-N sodium ethoxide Chemical compound [Na+].CC[O-] QDRKDTQENPPHOJ-UHFFFAOYSA-N 0.000 claims description 26
- 238000010438 heat treatment Methods 0.000 claims description 22
- YAYNEUUHHLGGAH-UHFFFAOYSA-N 1-chlorododecane Chemical compound CCCCCCCCCCCCCl YAYNEUUHHLGGAH-UHFFFAOYSA-N 0.000 claims description 20
- BWDBEAQIHAEVLV-UHFFFAOYSA-N 6-methylheptan-1-ol Chemical compound CC(C)CCCCCO BWDBEAQIHAEVLV-UHFFFAOYSA-N 0.000 claims description 19
- TVMXDCGIABBOFY-UHFFFAOYSA-N n-Octanol Natural products CCCCCCCC TVMXDCGIABBOFY-UHFFFAOYSA-N 0.000 claims description 19
- 238000000034 method Methods 0.000 claims description 16
- KWIUHFFTVRNATP-UHFFFAOYSA-N glycine betaine Chemical compound C[N+](C)(C)CC([O-])=O KWIUHFFTVRNATP-UHFFFAOYSA-N 0.000 claims description 14
- 238000006243 chemical reaction Methods 0.000 claims description 13
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 claims description 12
- 239000011734 sodium Substances 0.000 claims description 12
- 229910052708 sodium Inorganic materials 0.000 claims description 12
- 239000003513 alkali Substances 0.000 claims description 9
- 238000001914 filtration Methods 0.000 claims description 6
- 239000006260 foam Substances 0.000 abstract description 20
- 238000000926 separation method Methods 0.000 abstract description 4
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 36
- 239000000243 solution Substances 0.000 description 20
- CFSCETSZQVECLC-UHFFFAOYSA-M trimethyl(1-phenyltridecyl)azanium;chloride Chemical compound [Cl-].CCCCCCCCCCCCC([N+](C)(C)C)C1=CC=CC=C1 CFSCETSZQVECLC-UHFFFAOYSA-M 0.000 description 19
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 12
- 230000000052 comparative effect Effects 0.000 description 11
- 229910019142 PO4 Inorganic materials 0.000 description 9
- 239000010452 phosphate Substances 0.000 description 9
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 8
- 239000012141 concentrate Substances 0.000 description 8
- 239000011777 magnesium Substances 0.000 description 8
- 229910052749 magnesium Inorganic materials 0.000 description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 8
- 238000013019 agitation Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 6
- 235000019441 ethanol Nutrition 0.000 description 6
- 239000000203 mixture Substances 0.000 description 6
- 239000012535 impurity Substances 0.000 description 5
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 description 5
- 238000001179 sorption measurement Methods 0.000 description 5
- 230000000295 complement effect Effects 0.000 description 4
- 150000001875 compounds Chemical class 0.000 description 4
- 239000003814 drug Substances 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 125000002467 phosphate group Chemical group [H]OP(=O)(O[H])O[*] 0.000 description 4
- 150000003839 salts Chemical class 0.000 description 4
- 238000005804 alkylation reaction Methods 0.000 description 3
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 3
- 239000002994 raw material Substances 0.000 description 3
- 230000035484 reaction time Effects 0.000 description 3
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 2
- 150000001450 anions Chemical class 0.000 description 2
- JBIROUFYLSSYDX-UHFFFAOYSA-M benzododecinium chloride Chemical compound [Cl-].CCCCCCCCCCCC[N+](C)(C)CC1=CC=CC=C1 JBIROUFYLSSYDX-UHFFFAOYSA-M 0.000 description 2
- XKXHCNPAFAXVRZ-UHFFFAOYSA-N benzylazanium;chloride Chemical compound [Cl-].[NH3+]CC1=CC=CC=C1 XKXHCNPAFAXVRZ-UHFFFAOYSA-N 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 150000001768 cations Chemical group 0.000 description 2
- 239000003153 chemical reaction reagent Substances 0.000 description 2
- 125000006575 electron-withdrawing group Chemical group 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 239000008396 flotation agent Substances 0.000 description 2
- 125000000524 functional group Chemical group 0.000 description 2
- 125000001165 hydrophobic group Chemical group 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 230000002195 synergetic effect Effects 0.000 description 2
- 238000003786 synthesis reaction Methods 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical group [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- NIPNSKYNPDTRPC-UHFFFAOYSA-N N-[2-oxo-2-(2,4,6,7-tetrahydrotriazolo[4,5-c]pyridin-5-yl)ethyl]-2-[[3-(trifluoromethoxy)phenyl]methylamino]pyrimidine-5-carboxamide Chemical compound O=C(CNC(=O)C=1C=NC(=NC=1)NCC1=CC(=CC=C1)OC(F)(F)F)N1CC2=C(CC1)NN=N2 NIPNSKYNPDTRPC-UHFFFAOYSA-N 0.000 description 1
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- VBIIFPGSPJYLRR-UHFFFAOYSA-M Stearyltrimethylammonium chloride Chemical group [Cl-].CCCCCCCCCCCCCCCCCC[N+](C)(C)C VBIIFPGSPJYLRR-UHFFFAOYSA-M 0.000 description 1
- 239000012670 alkaline solution Substances 0.000 description 1
- 230000029936 alkylation Effects 0.000 description 1
- CSDREXVUYHZDNP-UHFFFAOYSA-N alumanylidynesilicon Chemical compound [Al].[Si] CSDREXVUYHZDNP-UHFFFAOYSA-N 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 125000000129 anionic group Chemical group 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 125000002091 cationic group Chemical group 0.000 description 1
- 229910052681 coesite Inorganic materials 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 229910052906 cristobalite Inorganic materials 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- JRBPAEWTRLWTQC-UHFFFAOYSA-N dodecylamine Chemical compound CCCCCCCCCCCCN JRBPAEWTRLWTQC-UHFFFAOYSA-N 0.000 description 1
- 230000001094 effect on targets Effects 0.000 description 1
- 230000001804 emulsifying effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000007667 floating Methods 0.000 description 1
- 230000002209 hydrophobic effect Effects 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 229910052682 stishovite Inorganic materials 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 229910052905 tridymite Inorganic materials 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
- B03D1/001—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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Landscapes
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
- Paper (AREA)
Abstract
The invention discloses a collecting agent for synchronously collecting siliceous and magnesian minerals, a preparation method and application thereof, wherein the collecting agent comprises the following components: 2-dodecyl-N, N, N-trimethyl glycinate, mixed fatty alcohol and (octa-octadecyl) trimethyl benzyl ammonium chloride. The collecting agent has good selectivity, can realize the synchronous collection of siliceous and magnesian gangue minerals in phosphorite, has low foam viscosity and easy defoaming, effectively shortens the flotation flow and improves the mineral separation efficiency.
Description
Technical Field
The invention relates to the field of phosphorite flotation, in particular to a collecting agent for synchronously collecting siliceous and magnesian minerals and a preparation method and application thereof.
Background
With the annual exploitation of phosphate ores, high-quality phosphate ores are gradually depleted, and phosphate ores in some regions mainly take complex siliceous magnesium collophanite as a main part. Aiming at the difficult-to-sort collophanite, the current sorting means mainly adopts flotation as a main part, and the flotation agent is added to form bubbles in slurry and selectively adsorb on the surface of target minerals to make the target minerals hydrophobic, so that the aim of mineral separation is fulfilled under the drive of the bubbles. According to the properties of siliceous and magnesian collophanite, the reverse flotation is adopted as the most important process, and the flotation agent plays a decisive role as the most important ring in the reverse flotation process, wherein the influence of the collecting agent is the greatest.
In order to effectively separate phosphorus minerals from siliceous and magnesian gangue, researchers developed various reverse flotation collectors in recent years, which can be roughly divided into anionic reverse flotation magnesium removal collectors and cationic reverse flotation silicon removal collectors, wherein most of the reverse flotation collectors have problems of high foam viscosity, small collection range, weak selection capability and more limitations, such as complicated manufacturing steps, complex reagent system, severe flotation conditions, narrow application range and the like, which affect the beneficiation efficiency and are extremely difficult to apply industrially.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provides the collecting agent for synchronously collecting the siliceous minerals and the magnesian minerals as well as the preparation method and the application thereof.
In order to achieve the purpose, the invention adopts the following technical scheme:
the invention firstly provides a collector for synchronously collecting siliceous and magnesian minerals, which comprises the following components: 2-dodecyl-N, N, N-trimethyl glycinate, mixed fatty alcohol and (octa-octadecyl) trimethyl benzyl ammonium chloride.
More preferably, the collector composition comprises: 2-dodecyl-N, N, N-trimethyl glycinate, mixed fatty alcohol and dodecyl trimethyl benzyl ammonium chloride.
More preferably, the collector has a composition of: 2-dodecyl-N, N, N-trimethyl glycinate, mixed fatty alcohol and dodecyl trimethyl benzyl ammonium chloride.
Preferably, the mixed fatty alcohol component comprises n-octanol, isooctanol, n-nonanol, n-decanol.
More preferably, the mixed fatty alcohol is composed of n-octanol, isooctanol, n-nonanol and n-decanol.
Preferably, the collecting agent comprises 2-dodecyl-N, N, N-trimethyl glycinate, mixed fatty alcohol and (octa-octadecyl) trimethyl benzyl ammonium chloride in a mass ratio of (4-7): (1-3): (1-2).
More preferably, the collecting agent comprises 2-dodecyl-N, N, N-trimethyl glycinate, mixed fatty alcohol and dodecyl trimethyl benzyl ammonium chloride in a mass ratio of (4-7): (1-3): (1-2).
The invention also provides a preparation method of 2-dodecyl-N, N, N-trimethyl glycinate in the collecting agent, which comprises the following steps:
s1, dissolving sodium ethoxide in ethanol, mixing with N, N, N-trimethylglycine, heating and stirring to obtain sodium N, N, N-trimethylglycine;
s2, mixing the sodium N, N, N-trimethyl glycine and chlorododecane, heating and stirring, filtering and concentrating after the reaction is finished to obtain 2-dodecyl-N, N, N-trimethyl glycine;
s3, reacting the 2-dodecyl-N, N, N-trimethyl glycine with an alkali solution to obtain the 2-dodecyl-N, N, N-trimethyl glycine salt.
Preferably, in S1, the mass ratio of sodium ethoxide to ethanol is 1: (20-30).
Preferably, in S1, the mass ratio of N, N-trimethylglycine to sodium ethoxide is 1: (2-4).
Preferably, in the S1, the heating temperature is 30-50 ℃, and the stirring time is 2-4 hours.
Preferably, in S2, the mass ratio of sodium N, N-trimethyl glycinate to chlorododecane is 1: (1.5 to 3).
Preferably, in the S2, the heating temperature is 50-80 ℃, and the stirring time is 5-8 hours.
Preferably, in the S3, the molar ratio of the 2-dodecyl-N, N, N-trimethylglycine to the alkali solution is 1: (0.8 to 1.5).
Preferably, in S3, the alkali solution is sodium hydroxide solution.
Preferably, in the step S3, the reaction time is 15 to 60 min.
Preferably, the preparation method of the mixed fatty alcohol in the collector comprises the following steps: mixing and stirring n-octanol, isooctanol, n-nonanol and n-decanol to obtain the mixed fatty alcohol.
More preferably, in the mixed fatty alcohol, the mass ratio of the n-octanol to the isooctanol to the n-nonanol to the n-decanol is 1: (1-2): (0.8-1.6): (1-2).
The invention also provides a preparation method of the collecting agent for synchronously collecting the siliceous and magnesian minerals, which comprises the following steps: respectively preparing 2-dodecyl-N, N, N-trimethyl glycinate and mixed fatty alcohol, and then mixing and stirring the obtained 2-dodecyl-N, N, N-trimethyl glycinate and mixed fatty alcohol with (octa-octadecyl) alkyl trimethyl benzyl ammonium chloride to obtain the collecting agent.
More preferably, the mass ratio of the 2-dodecyl-N, N, N-trimethyl glycinate, the mixed fatty alcohol and the (octa-octadecyl) -N, N, N-trimethyl benzyl ammonium chloride is (4-7): (1-3): (1:2).
More preferably, the (octa-octadecyl) alkyltrimethylbenzylammonium chloride is dodecyl trimethylbenzylammonium chloride.
The invention also provides application of the collector for synchronously collecting the siliceous and magnesian minerals in the reverse flotation process of the phosphorite.
The invention has the beneficial effects that:
1. in the collecting agent for synchronously collecting siliceous minerals and magnesian minerals, after 2-dodecyl-N, N, N-trimethylglycinate is compounded with mixed fatty alcohol and (octa-octadecyl) alkyltrimethyl benzyl ammonium chloride, three medicaments can play a complementary role, the solubility of the collecting agent is increased due to the introduction of a plurality of hydroxyl hydrophilic groups, the dispersity of the obtained compounded collecting agent is enhanced, the selectivity is greatly improved, the surface activity of the collecting agent can be improved, the surface tension of a gas-liquid interface is reduced, the collecting capability of the compounded collecting agent is greatly enhanced, meanwhile, the excessive adsorption phenomenon in the flotation process is prevented by reasonably selecting the proportion of each component in the compounded collecting agent, the brittleness of foams is greatly improved, and the flowability is enhanced.
2. According to the collecting agent for synchronously collecting the siliceous minerals and the magnesian minerals, the excessive adsorption phenomenon in the flotation process is prevented by reasonably selecting the proportion of each component in the compound collecting agent, the brittleness of foams is greatly improved, and the flowability is enhanced.
3. The preparation process of the 2-dodecyl-N, N, N-trimethyl glycinate in the collecting agent for synchronously collecting the siliceous and magnesian minerals is simple, the product is resistant to low temperature, all the steps are matched with each other, so that the molecular structure simultaneously has anion and cation groups, a novel amphiphilic collecting agent component with an amphiphilic group and a single hydrophobic group is obtained, after the reaction of S3, the siliceous magnesian gangue in phosphorite can be synchronously floated by adjusting the pH value, after the siliceous magnesian gangue is compounded with the mixed fatty alcohol and the (octa-octadecyl) alkyl trimethyl benzyl ammonium chloride, the three agents can play a complementary role, under the synergistic action of various functional groups, the dispersibility of the obtained compounded collecting agent is enhanced, and the selectivity and the collecting performance are greatly improved.
4. The collecting agent for synchronously collecting the siliceous minerals and the magnesian minerals can synchronously collect the siliceous minerals and the magnesian gangue minerals in collophanite in the reverse flotation process of the phosphorite, and remove two main impurities in the phosphorite at one time.
Detailed Description
In order that those skilled in the art will better understand the technical solutions of the present invention, the present invention will be further described in detail with reference to the following embodiments.
The collector aims at the problems that the existing collophanite reverse flotation collector has high foam viscosity, small collecting range, weaker selection capability and more limitations, and the mineral separation efficiency is influenced by complicated manufacturing steps, complex reagent system, severe flotation conditions, narrow application range and the like. The invention provides a collecting agent for synchronously collecting siliceous and magnesian minerals with high selectivity and high mineral separation efficiency, which can realize the synchronous flotation of the siliceous and magnesian gangue minerals under simple flotation conditions, and has low foam viscosity and easy defoaming. Specifically, the components of the collector comprise: 2-dodecyl-N, N, N-trimethyl glycinate, mixed fatty alcohol and (octa-octadecyl) trimethyl benzyl ammonium chloride.
The molecular structural formula of the 2-dodecyl-N, N, N-trimethyl glycinate is as follows:
the 2-dodecyl-N, N, N-trimethyl glycinate is a novel amphoteric collector with an amphiphilic group and a single hydrophobic group, and has two electron-withdrawing groups of carboxylate radical and amine radical, and the two electron-withdrawing groups are respectively distributed on two sides of a carbon chain, so that the electron cloud density is more uniform, the electronegativity is moderate, the selective collecting effect on target minerals is better, the carboxylate radical selectively adsorbs magnesian gangue minerals, and the amine radical selectively adsorbs siliceous gangue minerals, so that the effect of synchronously collecting siliceous and magnesian gangue can be achieved.
The mixed fatty alcohol contains a plurality of hydroxyl hydrophilic groups, so that the solubility of the collecting agent is increased, the dispersibility of the obtained compound collecting agent is enhanced, and the selectivity is greatly improved. According to a plurality of experimental researches, in the invention, the mixed fatty alcohol component comprises n-octanol, isooctanol, n-nonanol and n-decanol; in some embodiments of the invention, the mixed fatty alcohol consists of n-octanol, isooctanol, n-nonanol, n-decanol.
In the collecting agent for synchronously collecting siliceous minerals and magnesian minerals, after 2-dodecyl-N, N, N-trimethylglycinate is compounded with mixed fatty alcohol and (octa-octadecyl) alkyltrimethyl benzyl ammonium chloride, three medicaments can play a complementary role, the solubility of the collecting agent is increased due to the introduction of a plurality of hydroxyl hydrophilic groups, the dispersity of the obtained compounded collecting agent is enhanced, the selectivity is greatly improved, the surface activity of the collecting agent can be improved, the surface tension of a gas-liquid interface is reduced, the collecting capability of the compounded collecting agent is greatly enhanced, meanwhile, the excessive adsorption phenomenon in the flotation process is prevented by reasonably selecting the proportion of each component in the compounded collecting agent, the brittleness of foams is greatly improved, and the flowability is enhanced. The collecting agent can effectively reduce the content of aluminum and magnesium in phosphorite, can radically reduce the influence of impurities, further reduce the pressure of subsequent processes on treating aluminum-silicon impurities, and fully realize the efficient comprehensive utilization of the existing phosphorite resources.
In particular, the dodecyl dimethyl benzyl ammonium chloride has good emulsifying property, easily-obtained materials and dispersing and permeating effects, and the surface activity of the collecting agent can be improved by the composite collecting agent added with the dodecyl dimethyl benzyl ammonium chloride. In some embodiments of the invention, the collector consists of 2-dodecyl-N, N-trimethylglycinate, mixed fatty alcohol and dodecyltrimethylbenzylammonium chloride.
In the invention, the excessive adsorption phenomenon in the flotation process is prevented by reasonably selecting the proportion of each component in the compound collector, the brittleness of foam is greatly improved, and the fluidity is enhanced. Through multiple experimental research and adjustment, the components of the collecting agent are calculated according to the mass ratio, 2-dodecyl-N, N, N-trimethyl glycinate: mixing fatty alcohol: (octa-octadecyl) trimethyl benzyl ammonium chloride is (4-7): (1-3): (1-2); in some embodiments of the invention, 2-dodecyl-N, N-trimethylglycinate: mixing fatty alcohol: dodecyl trimethyl benzyl ammonium chloride is 7: 1: 1; in some embodiments of the invention, 2-dodecyl-N, N-trimethylglycinate: mixing fatty alcohol: dodecyl trimethyl benzyl ammonium chloride is 4: 3: 2; in some embodiments of the invention, 2-dodecyl-N, N-trimethylglycinate: mixing fatty alcohol: dodecyl trimethyl benzyl ammonium chloride is 6: 2: 1.
the invention also provides a preparation method of 2-dodecyl-N, N, N-trimethyl glycinate in the collecting agent, which comprises the following steps:
s1, dissolving sodium ethoxide in ethanol, mixing with N, N, N-trimethylglycine, heating and stirring to obtain sodium N, N, N-trimethylglycine;
s2, mixing the sodium N, N, N-trimethyl glycine and chlorododecane, heating and stirring, filtering and concentrating after the reaction is finished to obtain 2-dodecyl-N, N, N-trimethyl glycine;
s3, reacting the 2-dodecyl-N, N, N-trimethyl glycine with an alkali solution to obtain the 2-dodecyl-N, N, N-trimethyl glycine salt.
In the preparation method, sodium ethoxide, ethanol and chlorododecane are used as raw materials for alkylation reaction of N, N, N-trimethylglycine, and an alkaline solution is used as raw materials for alkylation reaction, so that the components of the novel collecting agent are obtained, and the obtained N, N, N-trimethylglycine has a novel molecular structure after alkylation, has good collecting performance, and can be used for synchronously floating siliceous magnesian gangue minerals in phosphorite.
The 2-dodecyl-N, N, N-trimethyl glycinate is simple in preparation process and low-temperature resistant, the molecular structure of the 2-dodecyl-N, N, N-trimethyl glycinate simultaneously has anion and cation groups, after reaction, the siliceous magnesian gangue in phosphorite can be synchronously floated by adjusting the pH value, after the 2-dodecyl-N, N, N-trimethyl glycinate is compounded with the mixed fatty alcohol and the (octa-octadecyl) trimethyl benzyl ammonium chloride, the three agents can play a complementary role, under the synergistic action of various functional groups, the dispersibility of the obtained compounded collecting agent is enhanced, and the selectivity and the collecting performance are greatly improved.
The setting of the preparation process parameters is obtained through a plurality of experiments, and the synthesis rate above or below the range is reduced. Therefore, in S1 of the present invention, the ratio of sodium ethoxide: ethanol is 1: (20-30); in some embodiments of the invention, the ethanol is absolute ethanol; in some embodiments of the invention, the sodium ethoxide: the absolute ethyl alcohol is 1: 20; in some embodiments of the invention, the sodium ethoxide: the absolute ethyl alcohol is 1: 25; in some embodiments of the invention, the sodium ethoxide: the absolute ethyl alcohol is 1: 30.
in S1 of the present invention, the ratio by mass of the N, N-trimethylglycine: sodium ethoxide is 1: (2-4); in some embodiments of the invention, the ratio of N, N-trimethylglycine: sodium ethoxide is 1: 4; in some embodiments of the invention, the ratio of N, N-trimethylglycine: sodium ethoxide is 1: 2; in some embodiments of the invention, the ratio of N, N-trimethylglycine: sodium ethoxide is 1: 3.
in the S1, the heating temperature is 30-50 ℃, and the stirring time is 2-4 h; in some embodiments of the invention, the heating temperature is 30 ℃ and the stirring time is 4 h; in some embodiments of the invention, the heating temperature is 50 ℃ and the stirring time is 2 h; in some embodiments of the invention, the heating temperature is 40 ℃ and the stirring time is 2 h.
In S2 of the present invention, the ratio by mass of sodium N, N-trimethylglycinate: chlorododecane is 1: (1.5-3); in some embodiments of the invention, the chlorododecane is 1-chlorododecane; in some embodiments of the invention, the ratio of sodium N, N-trimethylglycinate: 1-chlorododecane is 1: 1.5; in some embodiments of the invention, the ratio of sodium N, N-trimethylglycinate: 1-chlorododecane is 1: 3; in some embodiments of the invention, the ratio of sodium N, N-trimethylglycinate: 1-chlorododecane is 1: 2.
in the S2, the heating temperature is 50-80 ℃, and the stirring time is 5-8 h; in some embodiments of the invention, the heating temperature is 50 ℃ and the stirring time is 8 h; in some embodiments of the invention, the heating temperature is 80 ℃ and the stirring time is 5 h; in some embodiments of the invention, the heating temperature is 80 ℃ and the stirring time is 5 h.
In S3 of the present invention, the alkali solution is not particularly limited and is a material conventionally used in the art, and in some embodiments of the present invention, the alkali solution is a sodium hydroxide solution. In the invention, the molar ratio of 2-dodecyl-N, N, N-trimethylglycine: the alkali solution is 1: (0.8 to 1.5); in some embodiments of the invention, 2-dodecyl-N, N-trimethylglycine: sodium hydroxide is 1: 0.8; in some embodiments of the invention, 2-dodecyl-N, N-trimethylglycine: sodium hydroxide is 1: 1.5; in some embodiments of the invention, 2-dodecyl-N, N-trimethylglycine: sodium hydroxide is 1: 1.1.
in the S3, the reaction time is 15-60 min; in some embodiments of the invention, the time of reaction is 60 min; in some embodiments of the invention, the time of reaction is 15 min; in some embodiments of the invention, the reaction time is 30 min.
The preparation method of the mixed fatty alcohol in the collector comprises the following steps: mixing and stirring n-octanol, isooctanol, n-nonanol and n-decanol to obtain the mixed fatty alcohol. Experiments show that if the mixture ratio of the components is not in the range, the performance of the collecting agent is weakened, and the collecting agent is obtained after multiple experimental adjustments, wherein the n-octanol is obtained by the following components in percentage by mass: isooctyl alcohol: n-nonanol: n-decanol is 1: (1-2): (0.8-1.6): (1-2); in some embodiments of the invention, the n-octanol: isooctyl alcohol: n-nonanol: n-decanol is 1: 2: 1.6: 2; in some embodiments of the invention, the n-octanol: isooctyl alcohol: n-nonanol: n-decanol is 1: 1.5: 1.2: 1.5; in some embodiments of the invention, the n-octanol: isooctyl alcohol: n-nonanol: n-decanol is 1: 1: 0.8: 1.
the invention also provides a preparation method of the collecting agent for synchronously collecting the siliceous and magnesian minerals, which comprises the following steps: respectively preparing 2-dodecyl-N, N, N-trimethyl glycinate and mixed fatty alcohol, and then mixing and stirring the obtained 2-dodecyl-N, N, N-trimethyl glycinate and mixed fatty alcohol with (octa-octadecyl) alkyl trimethyl benzyl ammonium chloride to obtain the collecting agent.
In the preparation method of the collecting agent, the excessive adsorption phenomenon in the flotation process is prevented by reasonably selecting the proportion of each component in the compound collecting agent, the brittleness of foam is greatly improved, and the fluidity is enhanced. In the invention, the 2-dodecyl-N, N, N-trimethylglycinate salt is prepared from the following components in percentage by mass: mixing fatty alcohol: (octa-octadecyl) trimethyl benzyl ammonium chloride is (4-7): (1-3): (1: 2); in some embodiments of the invention, the 2-dodecyl-N, N-trimethylglycinate salt: mixing fatty alcohol: dodecyl trimethyl benzyl ammonium chloride is 7: 1: 1; in some embodiments of the invention, the 2-dodecyl-N, N-trimethylglycinate salt: mixing fatty alcohol: dodecyl trimethyl benzyl ammonium chloride is 4: 3: 2; in some embodiments of the invention, the 2-dodecyl-N, N-trimethylglycinate salt: mixing fatty alcohol: dodecyl trimethyl benzyl ammonium chloride is 6: 2: 1.
the invention also provides application of the collector for synchronously collecting the siliceous and magnesian minerals in the reverse flotation process of the phosphorite. The collecting agent can synchronously collect siliceous and magnesian gangue minerals in phosphorite in application and remove two main impurities in the phosphorite at one time, has strong adaptability to ores, can adapt to flotation at lower temperature, has high flotation efficiency, can simplify the flotation process, reduce the flotation control difficulty and the flotation production cost, and has good popularization value.
The foregoing is a detailed description of the invention and the following is an example of the invention.
The raw materials used in the examples are all commercially available:
sodium ethoxide: industrial grade, purity 99%;
anhydrous ethanol: analytically pure, purity 99.9%;
n, N-trimethylglycine: industrial grade, purity is more than or equal to 65%;
1-chlorododecane: analytically pure, purity 99%;
sodium hydroxide: analytically pure, purity 99%;
n-octanol: industrial grade, purity 99%;
isooctyl alcohol: industrial grade, purity 99.8%;
n-nonanol: industrial grade, purity 99%;
n-decanol: industrial grade, purity 99.5%;
dodecyl trimethyl benzyl ammonium chloride: industrial grade, purity 99%;
sulfuric acid: industrial grade, purity 98%.
In the embodiment, the collophanite used is the collophanite mined by a certain phosphate ore factory in Guizhou, and is ground to 78.46 percent of minus 200 meshes for standby after being crushed. The chemical composition is shown in table 1.
TABLE 1 collophanite index (mass%)
| P2O5 | CaO | MgO | SiO2 |
| 23.36 | 40.67 | 4.46 | 18.81 |
Example 1
1. Preparation of 2-dodecyl-N, N, N-trimethylglycinate:
(1) dissolving sodium ethoxide in absolute ethyl alcohol, wherein the ratio of sodium ethoxide: the mass ratio of the absolute ethyl alcohol is 1: 20, and mixing with N, N-trimethylglycine, wherein N, N-trimethylglycine: the mass ratio of the sodium ethoxide is 1: 4, heating and stirring for 4 hours at the temperature of 30 ℃ to obtain 2-Na-N, N, N-trimethylglycine;
(2) mixing the 2-Na-N, N, N-trimethylglycine obtained in the step (1) with 1-chlorododecane, wherein the ratio of 2-Na-N, N, N-trimethylglycine: the mass ratio of the 1-chlorododecane is 1: 1.5, heating and stirring at 50 ℃ for 8 hours, filtering and concentrating the obtained product after the reaction is finished to obtain 2-dodecyl-N, N, N-trimethylglycine;
(3) mixing the 2-dodecyl-N, N, N-trimethylglycine obtained in the step (2) with a sodium hydroxide solution for reaction, wherein the ratio of 2-dodecyl-N, N, N-trimethylglycine: the molar ratio of the sodium hydroxide solution is 1: 0.8, mixing and stirring for 60min to obtain 2-dodecyl-N, N, N-trimethyl glycinate.
2. Preparation of mixed fatty alcohol: mixing and stirring n-octanol, isooctanol, n-nonanol and n-decanol uniformly, wherein the ratio of n-octanol to decanol is as follows: isooctyl alcohol: n-nonanol: the mass ratio of the n-decanol to the decyl alcohol is 1: 2: 1.6: 2, obtaining the mixed fatty alcohol.
3. Preparing a collecting agent: the weight ratio of 2-dodecyl-N, N, N-trimethyl glycinate: mixing fatty alcohol: dodecyl trimethyl benzyl ammonium chloride ═ 7: 1: 1, mixing and uniformly stirring the components to obtain the collophanite reverse flotation desilication magnesium collecting agent, and adding water into the collecting agent to prepare a solution with the mass concentration of 2% for later use.
Taking 800g of collophanite in the table 1, adding water to prepare ore pulp with the mass concentration of 30%, adding sulfuric acid to adjust the pH value of the ore pulp to 4-6, and adding the collecting agent solution in the embodiment, wherein the dry basis mass ratio is that the collophanite: collector 1000: 0.8, performing primary reverse flotation by using an air agitation flotation tank at the flotation temperature of 20 ℃ until no mineralized foam is generated, wherein the flotation foam product is the tailings rich in siliceous and magnesian gangue minerals, and the product in the flotation tank is phosphate concentrate.
Example 2
1. Preparation of 2-dodecyl-N, N, N-trimethylglycinate:
(1) dissolving sodium ethoxide in absolute ethyl alcohol, wherein the ratio of sodium ethoxide: the mass ratio of the absolute ethyl alcohol is 1: and mixing with N, N, N-trimethylglycine, wherein the ratio of N, N, N-trimethylglycine: the mass ratio of the sodium ethoxide is 1: 2, heating and stirring for 2 hours at 50 ℃ to obtain 2-Na-N, N, N-trimethylglycine;
(2) mixing the 2-Na-N, N, N-trimethylglycine obtained in the step (1) with 1-chlorododecane, wherein the ratio of 2-Na-N, N, N-trimethylglycine: the mass ratio of the 1-chlorododecane is 1: 3, heating and stirring the mixture for 5 hours at the temperature of 80 ℃, and filtering and concentrating the obtained product after the reaction is finished to obtain 2-dodecyl-N, N, N-trimethylglycine;
(3) mixing the 2-dodecyl-N, N, N-trimethylglycine obtained in the step (2) with a sodium hydroxide solution for reaction, wherein the ratio of 2-dodecyl-N, N, N-trimethylglycine: the molar ratio of sodium hydroxide is 1: 1.5, mixing and stirring for 15min to obtain 2-dodecyl-N, N, N-trimethyl glycinate.
2. Preparation of mixed fatty alcohol: mixing and stirring n-octanol, isooctanol, n-nonanol and n-decanol uniformly, wherein the ratio of n-octanol to decanol is as follows: isooctyl alcohol: n-nonanol: the mass ratio of the n-decanol to the decyl alcohol is 1: 1.5: 1.2: 1.5, obtaining the mixed fatty alcohol.
3. Preparing a collecting agent: the weight ratio of 2-dodecyl-N, N, N-trimethyl glycinate: mixing fatty alcohol: dodecyl trimethyl benzyl ammonium chloride ═ 4: 3: 2, mixing the components and uniformly stirring to obtain the collophanite reverse flotation desilication magnesium collecting agent, and then adding water into the collecting agent to prepare a solution with the mass concentration of 2% for later use.
Taking 800g of collophanite in the table 1, adding water to prepare ore pulp with the mass concentration of 30%, adding sulfuric acid to adjust the pH value of the ore pulp to 4-6, and adding the collecting agent solution in the embodiment, wherein the dry basis mass ratio is that the collophanite: collector 1000: 0.8, performing primary reverse flotation by using an air agitation flotation tank at the flotation temperature of 20 ℃ until no mineralized foam is generated, wherein the flotation foam product is the tailings rich in siliceous and magnesian gangue minerals, and the product in the flotation tank is phosphate concentrate.
Example 3
1. Preparation of 2-dodecyl-N, N, N-trimethylglycinate:
(1) dissolving sodium ethoxide in absolute ethyl alcohol, wherein the ratio of sodium ethoxide: the mass ratio of the absolute ethyl alcohol is 1: 30, and mixing with N, N-trimethylglycine, wherein N, N-trimethylglycine: the mass ratio of the sodium ethoxide is 1: 3, heating and stirring for 2 hours at 40 ℃ to obtain 2-Na-N, N, N-trimethylglycine;
(2) mixing the 2-Na-N, N, N-trimethylglycine obtained in the step (1) with 1-chlorododecane, wherein the ratio of 2-Na-N, N, N-trimethylglycine: the mass ratio of the 1-chlorododecane is 1: 2, heating and stirring the mixture for 5 hours at the temperature of 80 ℃, and filtering and concentrating the obtained product after the reaction is finished to obtain 2-dodecyl-N, N, N-trimethylglycine;
(3) mixing the 2-dodecyl-N, N, N-trimethylglycine obtained in the step (2) with a sodium hydroxide solution for reaction, wherein the ratio of 2-dodecyl-N, N, N-trimethylglycine: the molar ratio of sodium hydroxide is 1: 1.1, mixing and stirring for 30min to obtain 2-dodecyl-N, N, N-trimethyl glycinate.
2. Preparation of mixed fatty alcohol: mixing and stirring n-octanol, isooctanol, n-nonanol and n-decanol uniformly, wherein the ratio of n-octanol to decanol is as follows: isooctyl alcohol: n-nonanol: the mass ratio of the n-decanol to the decyl alcohol is 1: 1: 0.8: 1, obtaining the mixed fatty alcohol.
3. Preparing a collecting agent: the weight ratio of 2-dodecyl-N, N, N-trimethyl glycinate: mixing fatty alcohol: dodecyl trimethyl benzyl ammonium chloride ═ 6: 2: 1, mixing and uniformly stirring the components to obtain the collophanite reverse flotation desilication magnesium collecting agent, and adding water into the collecting agent to prepare a solution with the mass concentration of 2% for later use.
Taking 800g of collophanite in the table 1, adding water to prepare ore pulp with the mass concentration of 30%, adding sulfuric acid to adjust the pH value of the ore pulp to 4-6, and adding the collecting agent solution in the embodiment, wherein the dry basis mass ratio is that the collophanite: collector 1000: 0.8, performing primary reverse flotation by using an air agitation flotation tank at the flotation temperature of 20 ℃ until no mineralized foam is generated, wherein the flotation foam product is the tailings rich in siliceous and magnesian gangue minerals, and the product in the flotation tank is phosphate concentrate.
Example 4
The same as example 3, except that dodecyltrimethylbenzylammonium chloride was replaced with octaalkyltrimethylbenzylammonium chloride.
Example 5
The same as example 3, except that dodecyltrimethylbenzylammonium chloride was replaced with octadecyltrimethylammonium chloride.
Comparative example 1
The difference from example 3 is that no mixed fatty alcohol and dodecyltrimethylbenzylammonium chloride was added during the collector preparation.
Comparative example 2
The difference to example 3 is that dodecyl trimethyl benzyl ammonium chloride was not added during the collector preparation.
Comparative example 3
The difference from example 3 is that no mixed fatty alcohol was added during the collector preparation.
Comparative example 4
Adopt traditional collophanite single reverse flotation demagging technology, get the collophanite 800g of table 1, add water and prepare into the ore pulp that the mass concentration is 30%, add sulfuric acid and adjust ore pulp pH and be 4 ~ 6, add collector WF-01, according to dry basis mass ratio collophanite: collector 1000: 0.8, performing primary reverse flotation by using an air agitation flotation tank at the flotation temperature of 20 ℃ until no mineralized foam is generated, wherein the flotation foam product is the tailings rich in the magnesium gangue minerals, and the product in the flotation tank is the phosphate concentrate.
Comparative example 5
Adopting traditional collophanite two-reverse flotation process, getting 800g of collophanite of table 1, adding water and preparing into ore pulp with mass concentration of 30%, adding sulfuric acid to adjust the pH of the ore pulp to 4-6, adding magnesium removal collecting agent WF-01, according to the dry basis mass ratio collophanite: collector 1000: 0.8, under the condition that the flotation temperature is 20 ℃, an air agitation flotation tank is used for demagging reverse flotation until no mineralized foam is generated, then desiliconized collecting agent dodecylamine is added, and collophanite is prepared according to the dry mass ratio: collector 1000: 0.6, desiliconizing and reverse flotation are carried out by using an air agitation flotation tank until no mineralized foam is generated, a flotation foam product is the tailings containing siliceous and magnesian gangue minerals, and a product in the flotation tank is phosphate concentrate.
Comparative example 6
The same as example 3, except that in the preparation of 2-dodecyl-N, N, N-trimethylglycine salt, 2-Na-N, N, N-trimethylglycine of step (2): 1-chlorododecane is 1: 1.
the indexes of the concentrate and the tailings obtained in the above examples and comparative examples are detailed in table 2:
TABLE 2 indexes of the concentrates and tailings obtained in the examples and comparative examples
According to the detection results in table 2, in examples 1 to 3, the collecting agent provided by the invention can synchronously collect siliceous and magnesian gangue minerals in phosphorite, remove two main impurities in the phosphorite at one time, has strong adaptability, good collecting property and selectivity and is easy to defoam. The comparison between the embodiment 1-3 and the comparative example 1-3 shows that the three components in the collecting agent are lack of one component and can not be matched and complemented, and the concentrate quality and the beneficiation efficiency can be obviously improved by reasonably selecting the proportion. The comparison between the embodiment 1-3 and the comparative example 6 shows that the condition of the collector is limited in the synthesis process, and the collecting performance of the collector is influenced when the collecting performance exceeds the limited parameter range. Through comparison between the embodiments 1 to 3 and the comparative examples 4 and 5, the collector for synchronously collecting the siliceous minerals and the magnesian minerals provided by the invention has better effect, simpler medicament system, lower flotation control difficulty and lower flotation production cost compared with the existing phosphorite flotation medicament, and has important practical significance.
The above is only a preferred embodiment of the present invention, and it should be noted that the above preferred embodiment should not be considered as limiting the present invention, and the protection scope of the present invention should be subject to the scope defined by the claims. It will be apparent to those skilled in the art that various modifications and adaptations can be made without departing from the spirit and scope of the invention, and these modifications and adaptations should be considered within the scope of the invention.
Claims (10)
1. A collector for synchronously collecting siliceous and magnesian minerals, which is characterized by comprising the following components: 2-dodecyl-N, N, N-trimethyl glycinate, mixed fatty alcohol and (octa-octadecyl) trimethyl benzyl ammonium chloride.
2. The collector of synchronously collecting siliceous and magnesian minerals according to claim 1, characterized in that the mixed fatty alcohol component comprises n-octanol, isooctanol, n-nonanol, n-decanol.
3. A collector for synchronously collecting siliceous and magnesian minerals according to claim 1, wherein the mass ratio of 2-dodecyl-N, N-trimethylglycinate, mixed fatty alcohol and (octa-octadecyl) trimethylbenzylammonium chloride in the collector is (4-7): (1-3): (1-2).
4. The collector for synchronously collecting the siliceous and magnesian minerals according to claim 1, characterized in that the preparation method of the 2-dodecyl-N, N, N-trimethylglycinate comprises the following steps:
s1, dissolving sodium ethoxide in ethanol, mixing with N, N, N-trimethylglycine, heating and stirring to obtain sodium N, N, N-trimethylglycine;
s2, mixing the sodium N, N, N-trimethyl glycine and chlorododecane, heating and stirring, filtering and concentrating after the reaction is finished to obtain 2-dodecyl-N, N, N-trimethyl glycine;
s3, reacting the 2-dodecyl-N, N, N-trimethyl glycine with an alkali solution to obtain the 2-dodecyl-N, N, N-trimethyl glycine salt.
5. The synchronous collecting siliceous and magnesian mineral collector according to claim 4, wherein in the S1, the mass ratio of sodium ethoxide to ethanol is 1: (20-30).
6. A collector for synchronously collecting siliceous and magnesian minerals according to claim 4, wherein in the S1, the mass ratio of the N, N, N-trimethylglycine to the sodium ethoxide is 1: (2-4).
7. A collector for synchronously collecting siliceous and magnesian minerals according to claim 4, characterized in that in S2, the mass ratio of the sodium N, N, N-trimethylglycinate to the chlorododecane is 1: (1.5 to 3).
8. A synchronous collecting siliceous and magnesian mineral collector according to claim 4 wherein the molar ratio of 2-dodecyl-N, N, N-trimethylglycine to alkali solution in S3 is 1: (0.8 to 1.5).
9. A method for preparing a collector for synchronously collecting siliceous and magnesian minerals according to any one of claims 1 to 8, wherein the method for preparing the collector comprises: respectively preparing 2-dodecyl-N, N, N-trimethyl glycinate and mixed fatty alcohol, and mixing and stirring the obtained 2-dodecyl-N, N, N-trimethyl glycinate and mixed fatty alcohol with (octa-octadecyl) alkyl trimethyl benzyl ammonium chloride to obtain the collecting agent.
10. The use of the collector for synchronously collecting siliceous and magnesian minerals according to any one of claims 1 to 8 in the reverse flotation of phosphorite.
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