CN114436997B - Amide ionic liquid, synthesis method thereof and application of amide ionic liquid in extraction and separation of gold - Google Patents
Amide ionic liquid, synthesis method thereof and application of amide ionic liquid in extraction and separation of gold Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07D—HETEROCYCLIC COMPOUNDS
- C07D295/00—Heterocyclic compounds containing polymethylene-imine rings with at least five ring members, 3-azabicyclo [3.2.2] nonane, piperazine, morpholine or thiomorpholine rings, having only hydrogen atoms directly attached to the ring carbon atoms
- C07D295/04—Heterocyclic compounds containing polymethylene-imine rings with at least five ring members, 3-azabicyclo [3.2.2] nonane, piperazine, morpholine or thiomorpholine rings, having only hydrogen atoms directly attached to the ring carbon atoms with substituted hydrocarbon radicals attached to ring nitrogen atoms
- C07D295/14—Heterocyclic compounds containing polymethylene-imine rings with at least five ring members, 3-azabicyclo [3.2.2] nonane, piperazine, morpholine or thiomorpholine rings, having only hydrogen atoms directly attached to the ring carbon atoms with substituted hydrocarbon radicals attached to ring nitrogen atoms substituted by carbon atoms having three bonds to hetero atoms with at the most one bond to halogen, e.g. ester or nitrile radicals
- C07D295/145—Heterocyclic compounds containing polymethylene-imine rings with at least five ring members, 3-azabicyclo [3.2.2] nonane, piperazine, morpholine or thiomorpholine rings, having only hydrogen atoms directly attached to the ring carbon atoms with substituted hydrocarbon radicals attached to ring nitrogen atoms substituted by carbon atoms having three bonds to hetero atoms with at the most one bond to halogen, e.g. ester or nitrile radicals with the ring nitrogen atoms and the carbon atoms with three bonds to hetero atoms attached to the same carbon chain, which is not interrupted by carbocyclic rings
- C07D295/15—Heterocyclic compounds containing polymethylene-imine rings with at least five ring members, 3-azabicyclo [3.2.2] nonane, piperazine, morpholine or thiomorpholine rings, having only hydrogen atoms directly attached to the ring carbon atoms with substituted hydrocarbon radicals attached to ring nitrogen atoms substituted by carbon atoms having three bonds to hetero atoms with at the most one bond to halogen, e.g. ester or nitrile radicals with the ring nitrogen atoms and the carbon atoms with three bonds to hetero atoms attached to the same carbon chain, which is not interrupted by carbocyclic rings to an acyclic saturated chain
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C303/00—Preparation of esters or amides of sulfuric acids; Preparation of sulfonic acids or of their esters, halides, anhydrides or amides
- C07C303/36—Preparation of esters or amides of sulfuric acids; Preparation of sulfonic acids or of their esters, halides, anhydrides or amides of amides of sulfonic acids
- C07C303/40—Preparation of esters or amides of sulfuric acids; Preparation of sulfonic acids or of their esters, halides, anhydrides or amides of amides of sulfonic acids by reactions not involving the formation of sulfonamide groups
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C311/00—Amides of sulfonic acids, i.e. compounds having singly-bound oxygen atoms of sulfo groups replaced by nitrogen atoms, not being part of nitro or nitroso groups
- C07C311/48—Amides of sulfonic acids, i.e. compounds having singly-bound oxygen atoms of sulfo groups replaced by nitrogen atoms, not being part of nitro or nitroso groups having nitrogen atoms of sulfonamide groups further bound to another hetero atom
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B11/00—Obtaining noble metals
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- 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
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- Y02P10/20—Recycling
Abstract
The invention belongs to the technical field of new material and noble metal separation, relates to preparation of a noble metal extractant, and relates to an amide ionic liquid, a synthesis method thereof and application thereof in gold extraction and separation. The structural formula is as follows:
the amide ionic liquid provided by the invention has the advantages of simple structure, simple and convenient synthesis process and good stability. The extractant has good extraction and separation effects on gold, and can realize the separation between gold and other metals, in the selective extraction experiment, the extraction rate of gold can reach 99.0%, while the extraction rate of other metals is less than 8.1%, and the extraction stability is good because the extraction rate is less affected by acidity and salinity. Therefore, the ionic liquid has better effect of extracting Au (III) from hydrochloric acid medium at room temperature.
Description
Technical Field
The invention belongs to the technical field of new material and noble metal separation, relates to preparation of a noble metal extractant, and relates to an amide ionic liquid, a synthesis method thereof and application thereof in gold extraction and separation.
Background
The disclosure of this background section is only intended to increase the understanding of the general background of the invention and is not necessarily to be construed as an admission or any form of suggestion that this information forms the prior art already known to those of ordinary skill in the art.
According to research and understanding of the inventor, the problems of the existing ionic liquid gold extraction are as follows: 1) In the practical application environment, the hardware fitting in mineral resources has various associated noble metals; 2) Gold in the secondary resource also coexists with metal ions such as copper, iron and the like, so that the separation and purification method of gold and platinum cannot only take the separation recovery rate as an index, and the purity of the recovered metal needs to be more important; 3) The traditional liquid-liquid extraction system has poor anti-interference capability, and the process flow is complicated, so that the ideal application effect is difficult to achieve.
Disclosure of Invention
In order to solve the defects of the prior art, the invention aims to provide the amide ionic liquid, the synthesis method and the application thereof in gold extraction and separation, and the invention creatively constructs an extraction system participated by the amide ionic liquid, which is more environment-friendly and cheaper than the commercial imidazolium ionic liquid, and provides the amide ionic liquid with higher selectivity, stability and interference resistance performance for gold extraction.
In order to achieve the above purpose, the technical scheme of the invention is as follows:
in one aspect, an amide ionic liquid has the structural formula:
on the other hand, according to the preparation method of the amide ionic liquid, dibutylamine and chloroacetyl chloride are subjected to amidation reaction to obtain N, N-di-N-butyl-2-chloroacetamide, the N, N-di-N-butyl-2-chloroacetamide and 1-methyl-pyrrolidine are subjected to quaternization reaction, and then bis (trifluoromethanesulfonyl) imide lithium salt is added to react, so that the amide ionic liquid is obtained.
In a third aspect, an application of the amide ionic liquid in gold extraction is provided.
In a fourth aspect, a method for extracting and separating gold includes the steps of:
dissolving the amide ionic liquid in an organic solvent to form an organic phase;
adding hydrochloric acid and water into the gold-containing mother solution to form a water phase;
the organic phase and the aqueous phase are mixed and extracted.
Au (iii) is extracted to the organic phase by the extraction according to the invention.
The beneficial effects of the invention are as follows:
1. the amide ionic liquid provided by the invention has the advantages of simple synthesis process and good thermal stability and chemical stability.
2. The amide ionic liquid provided by the invention is used as an extractant, has good extraction performance and extraction selectivity to hardware, the extraction rate of gold can reach 98.5%, and the extraction rate of other metals is less than 8.1%.
3. The extraction separation method provided by the invention is less influenced by the concentration of hydrochloric acid in the water phase, and has good gold extraction effect under different acidity.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention.
FIG. 1 shows the nuclear magnetic resonance hydrogen spectrum of an amide ionic liquid prepared in example 1 of the present invention.
Detailed Description
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the invention. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the present invention. As used herein, the singular is also intended to include the plural unless the context clearly indicates otherwise, and furthermore, it is to be understood that the terms "comprises" and/or "comprising" when used in this specification are taken to specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof.
In view of the problems of poor selectivity, poor anti-interference performance, easy pollution, high cost and the like of the existing ionic liquid extracted gold, the invention provides an amide ionic liquid, a synthesis method thereof and application thereof in extracting and separating gold.
In an exemplary embodiment of the present invention, an amide ionic liquid is provided, which has a structural formula:
in another embodiment of the invention, the preparation method of the amide ionic liquid is provided, dibutylamine and chloroacetyl chloride are subjected to amidation reaction to obtain N, N-di-N-butyl-2-chloroacetamide, the N, N-di-N-butyl-2-chloroacetamide and 1-methyl-pyrrolidine are subjected to quaternization reaction, and then bis (trifluoromethanesulfonyl) imide lithium salt is added to react, so that the amide ionic liquid is obtained.
In some embodiments, the temperature of the quaternization reaction is from 75 to 85 ℃.
In some embodiments, the reaction is performed at room temperature with the addition of lithium bis (trifluoromethanesulfonyl) imide salt. The room temperature refers to the temperature of the indoor environment, and is generally 15-30 ℃.
In some embodiments, the reaction is followed by centrifugation after addition of lithium bis (trifluoromethanesulfonyl) imide. The rotational speed of the centrifugal separation is 10000-15000 rpm.
The third embodiment of the invention provides an application of the amide ionic liquid in gold extraction.
In a fourth embodiment of the present invention, there is provided a method for extracting and separating gold, comprising the steps of:
dissolving the amide ionic liquid in an organic solvent to form an organic phase;
adding hydrochloric acid and water into the gold-containing mother solution to form a water phase;
the organic phase and the aqueous phase are mixed and extracted.
Au (iii) is extracted to the organic phase by the extraction according to the invention.
Researches show that the amide ionic liquid provided by the invention has a good extraction and separation effect on gold, can realize separation between gold and other metals, has an extraction rate of 99.0% in a selective extraction experiment, has an extraction rate of less than 8.2% for other metals, is less influenced by acidity and salinity, and has good extraction stability.
In some embodiments, the organic solvent is chloroform.
In some embodiments, the concentration of the amide ionic liquid in the organic phase is 2-15 mg/L. The research shows that when other conditions are in a better range, the concentration is more than 4mg/L, and the extraction rate can reach more than 94%. When the concentration is 9-11 mg/L, the extraction effect is better.
In some embodiments, the hydrochloric acid concentration in the aqueous phase is 0.1 to 5.0mol/L. When the concentration is 0.1-1.0 mol/L, the extraction effect is better.
In some embodiments, the extraction temperature is 20 to 65 ℃. Research shows that the extraction effect is better when the extraction temperature is 24-25 ℃. The extraction time is 15-25 min.
In some embodiments, the volume ratio of the organic phase to the aqueous phase is 1:2.5 to 3.5.
In order to enable those skilled in the art to more clearly understand the technical scheme of the present invention, the technical scheme of the present invention will be described in detail below with reference to specific examples and comparative examples.
The experimental methods described in the examples below, unless otherwise specified, are all conventional.
The metal mother solution used in the following examples is a hydrochloric acid solution containing gold or other metal ions.
After the extraction separation process is completed, the metal concentration in the extract is measured by ICP-OES (inductively coupled plasma emission spectrometer), and the extraction rate is calculated as follows:
wherein C is in And C eq (mol/L) represents the concentration of gold in the aqueous phase before and after extraction, respectively.
The reagents and materials used in the examples below, unless otherwise specified, were all commercially available.
Example 1
1.[DBA-Pyr][NTf 2 ]Is synthesized by (a)
Dibutylamine (3.23 g;25 mmol) was first dissolved in diethyl ether (30 mL) in a 100mL round bottom flask, magnetically stirred at room temperature and chloroacetyl chloride (2.26 g;20 mmol) was slowly added dropwise with a syringe, and the reaction was completed after 30 min. After the organic phase was washed with water, it was shaken in a separatory funnel and allowed to stand for separation, the upper layer of liquid was collected and dried over magnesium sulfate for 2h. After filtration, N-di-N-butyl-2-chloroacetamide can be obtained by rotary evaporation, and the mixture is stored in a vacuum drying oven at 60 ℃ for overnight.
N, N-di-N-butyl-2-chloroacetamide (2.06 g,10 mmol) and 1-methyl-pyrrolidine (0.85 g,10 mmol) were dissolved in acetonitrile (50 ml) in a 200ml round bottom flask and stirred at 80℃under reflux for 4h; after cooling the reaction product, the mixture was rotary evaporated; finally, the residue was directly dissolved in water and stirred with lithium bistrifluoromethanesulfonimide (12 mmol) for 1h. After a new phase was observed to develop and became stable, the bottom phase was collected by centrifugation at 12000rpm for 3 min. Product [ DBA-Pyr][NTf 2 ]And (3) storing the mixture in a vacuum drying oven at 60 ℃ for overnight to finally obtain light yellow viscous liquid, namely amide ionic liquid, wherein a nuclear magnetic spectrum chart is shown in figure 1.
2. Gold extraction process
Preparing an organic phase: the synthesized amide ionic liquid is taken as an extractant to be dissolved in chloroform to form an organic phase, and the concentration of the extractant is respectively 2mg/L, 4mg/L, 6mg/L, 8mg/L and 10mg/L.
Preparing an aqueous phase: taking mother solution containing gold (III), adding hydrochloric acid and diluting with deionized water to prepare a water phase with gold (III) concentration of 1.66mmol/L and water phase hydrochloric acid concentration of 0.1mol/L.
Mixing the organic phase and the aqueous phase according to the volume ratio of 1:3, extracting for 20min at 25 ℃, mechanically oscillating in the extraction process to ensure that the aqueous phase and the organic phase are fully contacted (the same applies below), and calculating the extraction rate of Au (III) after the extraction is completed.
In the extraction separation process, the extraction rate of Au (III) is 75.1%, 94.2%, 96.3%, 97.6% and 99.0% respectively under the concentration of 2-10mg/L of the extractant. It can be seen that the extraction efficiency is best at 10mg/L, so the subsequent examples were tested with 10mg/L.
Example 2
Synthesis of [ DBA-Pyr ] [ NTf2]
The synthesis method of the ionic liquid in this embodiment is specifically referred to embodiment 1.
2. Gold extraction process
Preparing an organic phase: the synthesized extractant is dissolved in chloroform to form an organic phase, and the concentration of the extractant is 10mg/L.
Preparing an aqueous phase: and (3) adding different amounts of hydrochloric acid into the mother solution containing Au (III) and diluting the mother solution with deionized water to prepare a water phase with the Au (III) concentration of 1.66mmol/L and the water phase hydrochloric acid concentration of 0.1mol/L.
Mixing the organic phase and the water phase according to the volume ratio of 1:3, respectively extracting at 25 ℃, 35 ℃, 45 ℃, 55 ℃ and 65 ℃ to extract Au (III), and calculating the extraction rate of Au (III) after the extraction is completed.
In the extraction separation process, the extraction rate of Au (III) under different temperature conditions is shown in Table 1. As the temperature increases, the extraction yield of Au (III) decreases slightly, but still at a higher level.
TABLE 1 temperature vs. [ DBA-Pyr][NTf 2 ]Influence of extraction of Au (III)
| Temperature (. Degree. C.) | 25 | 35 | 45 | 55 | 65 |
| Extraction yield (%) | 99.0 | 93.2 | 89.0 | 86.7 | 83.1 |
Example 3
1.[DBA-Pyr][NTf 2 ]Is synthesized by (a)
The synthesis method of the ionic liquid in this embodiment is specifically referred to embodiment 1.
2. Gold extraction process
Preparing an organic phase: the synthesized extractant is dissolved in chloroform to form an organic phase, and the concentration of the extractant is 10mg/L.
Preparing an aqueous phase: taking mother liquor containing gold (III), adding different amounts of sodium chloride solution and diluting with deionized water to prepare an aqueous phase with gold (III) concentration of 1.66mmol/L, wherein the hydrochloric acid concentration of the aqueous phase is kept at 0.1mol/L, and the chloride ion concentration is increased from 0.1mol/L to 5.0mol/L.
Mixing the organic phase and the water phase according to the volume ratio of 1:3, extracting Au (III), and calculating the extraction rate of Au (III) after the extraction is completed.
In the extraction and separation process, different Cl - The extraction efficiency of Au (III) at the concentration is shown in Table 2. Table 2 shows that as the chloride concentration increases, the Au (III) extraction decreases, but still at a higher level, indicating a higher anti-interference ability for chloride.
TABLE 2 chloride concentration vs. [ DBA-Pyr][NTf 2 ]Influence of extraction of Au (III)
Example 4
1.[DBA-Pyr][NTf 2 ]Is synthesized by (a)
The synthesis method of the ionic liquid in this embodiment is specifically referred to embodiment 1.
2. Gold extraction process
Preparing an organic phase: the synthesized extractant is dissolved in chloroform to form an organic phase, and the concentration of the extractant is 10mg/L.
Preparing an aqueous phase: adding different amounts of hydrochloric acid into the mother solution containing Au (III) and diluting the mother solution with deionized water to prepare a water phase with the Au (III) concentration of 1.66mmol/L, wherein the concentration of the hydrochloric acid in the water phase is increased from 0.1mol/L to 5.0mol/L.
Mixing the organic phase and the water phase according to the volume ratio of 1:3, extracting Au (III), and calculating the extraction rate of Au (III) after the extraction is completed.
In the extraction separation process, the extraction rate of Au (III) is shown in Table 3 under different hydrochloric acid concentrations. Table 3 shows that the effect of hydrochloric acid concentration on gold extraction is low.
TABLE 3 hydrochloric acid concentration vs. [ DBA-Pyr ]][NTf 2 ]Influence of extraction of Au (III)
| Hydrochloric acid concentration (mol/L) | 0.1 | 1.0 | 2.0 | 3.0 | 4.0 | 5.0 |
| Extraction yield (%) | 99.0 | 92.1 | 89.3 | 87.6 | 86.1 | 85.4 |
Example 5
In the embodiment, the extraction rate of the extractant on other non-noble metals is researched and counted to detect the extraction selectivity of the extractant on Au (III) in secondary resources.
1.[DBA-Pyr][NTf 2 ]Is synthesized by (a)
The synthesis method of the ionic liquid in this embodiment is specifically referred to embodiment 1.
2. Extraction process
Preparing an organic phase: the extractant synthesized in example 1 was dissolved in chloroform to form an organic phase, and the concentration of the extractant was 10mg/L.
Preparing an aqueous phase: taking mother liquor containing Au (III) and other metals (Mn (II), fe (III), cu (II), mg (II), ce (IV), co (II) and Zn (II)), adding hydrochloric acid and diluting with deionized water to prepare aqueous phase with metal concentration of 1.66mmol/L and aqueous phase hydrochloric acid concentration of 0.1mol/L.
Mixing the organic phase and the water phase according to the volume ratio of 1:3, extracting Au (III), and calculating the extraction rate of each metal after the extraction is completed.
In the extraction separation process, the extraction rate of each metal is shown in table 3. The three extractants have very high extraction rate to Au (III), but the extraction rate to other metals (Mn (II), fe (III), cu (II), mg (II), ce (IV), co (II) and Zn (II)) is not more than 10%, thus [ DBA-Pyr ]][NTf 2 ]The solvent extraction system has good extraction selectivity to gold.
TABLE 4 extraction of gold and other non-noble metals by extractants
| Metal ion | Au(Ⅲ) | Mn(Ⅱ) | Fe(Ⅲ) | Co(Ⅱ) | Cu(Ⅱ) | Ce(Ⅳ) | Mg(Ⅱ) | Zn(Ⅱ) |
| Extraction yield (%) | 94.3 | 3.3 | 5.2 | 4.3 | 8.2 | 2.6 | 3.3 | 2.1 |
Example 6
In the embodiment, the extraction rate of the extractant on other noble metals is researched and counted to detect the extraction selectivity of the extractant on Au (III) in secondary resources.
1.[DBA-Pyr][NTf 2 ]Is synthesized by (a)
The synthesis method of the ionic liquid in this embodiment is specifically referred to embodiment 1.
2. Extraction process
Preparing an organic phase: the extractant synthesized in example 1 was dissolved in chloroform to form an organic phase, and the concentration of the extractant was 1.5mmol/L.
Preparing an aqueous phase: taking mother liquor containing Au (III) and other metals (Pt (IV), pd (II), ru (II), rh (II) and Ir (IV)), adding hydrochloric acid and diluting with deionized water to prepare aqueous phase with metal concentration of 1.66mmol/L and aqueous phase hydrochloric acid concentration of 0.1mol/L.
Mixing the organic phase and the water phase according to the volume ratio of 1:3, extracting Au (III), and calculating the extraction rate of each metal after the extraction is completed.
In the extraction separation process, the extraction rate of each metal is shown in table 4. The three extractants have very high extraction rate to Au (III), but the extraction rate to other metals (Pt (IV), pd (II), ru (II), rh (II) and Ir (IV)) is not more than 5.0%, so the [ DBA-Pyr ]][NTf 2 ]The solvent extraction system has good extraction selectivity to gold.
TABLE 5 extraction of gold and other noble metals by extractants
| Noble metals | Au(Ⅲ) | Pt(Ⅳ) | Pd(Ⅱ) | Ru(Ⅱ) | Rh(Ⅱ) | Ir(Ⅳ) |
| Extraction yield (%) | 95.6 | 3.3 | 2.5 | 2.1 | 2.1 | 2.4 |
The above description is only of the preferred embodiments of the present invention and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (15)
1. An amide ionic liquid is characterized by having the structural formula:
2. a preparation method of an amide ionic liquid according to claim 1, which is characterized in that dibutylamine and chloroacetyl chloride are subjected to amidation reaction to obtain N, N-di-N-butyl-2-chloroacetamide, the N, N-di-N-butyl-2-chloroacetamide is subjected to quaternization reaction with 1-methyl-pyrrolidine, and then bis (trifluoromethanesulfonyl) imide lithium salt is added to react to obtain the amide ionic liquid.
3. The method for preparing an amide ionic liquid according to claim 2, wherein the quaternization reaction temperature is 75-85 ℃;
or, adding lithium bistrifluoro-methanesulfonimide to react at room temperature;
or adding lithium bistrifluoro-methylsulfonyl imide to react and centrifuging.
4. The method for producing an amide ionic liquid according to claim 3, wherein the centrifugal separation is carried out at a rotational speed of 10000 to 15000rpm.
5. Use of an amide ionic liquid according to claim 1 in gold extraction.
6. A method for extracting and separating gold, which is characterized by comprising the following steps:
dissolving the amide ionic liquid in the organic solvent to form an organic phase;
adding hydrochloric acid and water into the gold-containing mother solution to form a water phase;
the organic phase and the aqueous phase are mixed and extracted.
7. The method for separating gold according to claim 6, wherein the organic solvent is chloroform.
8. The method for separating gold according to claim 6, wherein the concentration of the amide ionic liquid in the organic phase is 2-15 mg/L.
9. The method for separating gold according to claim 6, wherein the concentration of the amide ionic liquid in the organic phase is 4-15 mg/L.
10. The method for separating gold according to claim 6, wherein the concentration of the amide ionic liquid in the organic phase is 9-11 mg/L.
11. The method for separating gold according to claim 6, wherein the concentration of hydrochloric acid in the aqueous phase is 0.1 to 5.0mol/L.
12. The method for separating gold according to claim 6, wherein the concentration of hydrochloric acid in the aqueous phase is 0.1 to 1.0mol/L.
13. The method for separating gold according to claim 6, wherein the extraction temperature is 20 to 65 ℃.
14. The method for separating gold according to claim 6, wherein the extraction temperature is 24 to 25 ℃.
15. The method for separating gold according to claim 6, wherein the volume ratio of the organic phase to the aqueous phase is 1:2.5-3.5.
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