CN105026583A - Precious metal recovery method using copper halide-containing organic solvent system - Google Patents
Precious metal recovery method using copper halide-containing organic solvent system Download PDFInfo
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- CN105026583A CN105026583A CN201480012943.4A CN201480012943A CN105026583A CN 105026583 A CN105026583 A CN 105026583A CN 201480012943 A CN201480012943 A CN 201480012943A CN 105026583 A CN105026583 A CN 105026583A
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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
- C22B11/04—Obtaining noble metals by wet processes
- C22B11/042—Recovery of noble metals from waste materials
- C22B11/046—Recovery of noble metals from waste materials from manufactured products, e.g. from printed circuit boards, from photographic films, paper or baths
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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
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Abstract
The invention provides a simple, economic, and environment-friendly precious metal recovery method for recovering a precious metal from a used electronic device or the like. A precious metal recovery method characterized in including: a step for dissolving a precious metal in a solvent system containing copper halide and an aprotic polar organic solvent; and a step for adding a reduction agent to the solvent system in which the precious metal is dissolved, and causing the precious metal to precipitate.
Description
Technical field
The present invention relates to and carry out the dissolving of precious metal and the method for recovery, and for the solvent system of the method.
Background technology
In electronic unit in the electronics such as mobile telephone, PC, use the various metal such as precious metal, rare metal.But, for cross these electronic units, economically or technical reason set out, fully do not reclaim energetically, recycle, its part outputs to abroad as hybrid metal, or by as trade waste process, this is present situation in Japan.So, these metals resources are carried out recycling, and carries out effectively using becoming important social topics.
Usually, when carrying out metal recycling from old product, object, after collection, disintegration, pulverizing, physically screening, carries out separation and purification by smelting.Known exist in smelting utilize the drying process dissolving, volatilize under high temperature and by the damp process of dissolving metal in water solution system.It is believed that drying process is for extensive operation, damp process accurately can be separated and also be applicable to small-scale operations.But in damp process, in order to dissolve the precious metals such as gold, use the highly toxic substances such as strong acid, chlorine, the cyanogen compound aqueous solution, therefore need facility investment to a certain degree, in addition, the carrying capacity of environment caused due to waste liquid etc. is also large.
So expect to build a kind of reutilization system, it is easy and simple to handle, simultaneously waste liquid amount is few, and carrying capacity of environment is little, effectively can reclaim precious metal from old electronics etc.
Prior art document
Non-patent literature
[non-patent literature 1] Tanaka is dry also, hill and also, Cheng Tianhong mono-, great Shi wise man hero, Materia (ま て り あ), and 5050 (4), p.161-167,2011
[non-patent literature 2] Nakao, T.and Sone, K., Chem.Commun., p.897-898,1996
Summary of the invention
The problem that invention will solve
Under above background, problem of the present invention is to provide a kind of easy and recovery method of the precious metal of the environment-friendly type of economy, for reclaiming precious metal from old electronics etc.
Solve the means of problem
The present inventor conducts in-depth research to solve above-mentioned problem, found that the organic solvent system by using containing copper halide, can dissolve with the shorter time and separate out target precious metal, thus complete the present invention.Also find further, in the solution dissolving this precious metal, only add a small amount of water, this precious metal just can be made to separate out, thereby, it is possible to realize a kind of system, wherein, can recycle after this water of separated from solvent.
That is, the present invention relates in a mode,
(1) recovery method for precious metal, wherein, comprises operation (A), in the solvent system of the polar organic solvent containing copper halide and aprotic, dissolves precious metal; With operation (B), in the solvent system being dissolved with described precious metal, add reductive agent, this precious metal is separated out;
(2) method as described in above-mentioned (1), wherein, described copper halide is selected from monobromination copper (I) or dibrominated copper (II);
(3) method as described in above-mentioned (1) or (2), wherein, the polar organic solvent of described aprotic is selected from dimethyl sulfoxide (DMSO), dimethyl formamide, acetone, acetonitrile, tetrahydrofuran (THF), Texacar PC or their mixture;
(4) method as described in any one of above-mentioned (1) ~ (3), wherein, described solvent system is further containing succinimide compound;
(5) method as described in any one of above-mentioned (1) ~ (3), wherein, described solvent system is further containing sodium halide or potassium halide;
(6) method as described in any one of above-mentioned (1) ~ (5), wherein, described reductive agent is water, xitix, Trisodium Citrate or sodium borohydride;
(7) method as described in (6), wherein, described reductive agent is water; Separate out described precious metal by described operation (B) and after reclaiming, comprise operation (C) further, remove the water contained in described solvent system, obtaining the solvent system that can again use in described operation (A);
(8) method as described in (6) or (7), wherein, the pH as the water of described reductive agent is less than 4;
(9) method as described in any one of above-mentioned (1) ~ (8), wherein, described precious metal is selected from gold, palladium, silver or platinum.
The present invention relates to further in other mode,
(10) solvent system, it is for dissolving precious metal and reclaiming, and it contains the polar organic solvent of copper halide and aprotic;
(11) solvent system as described in above-mentioned (10), wherein, described copper halide is selected from monobromination copper (I) or dibrominated copper (II);
(12) solvent system as described in above-mentioned (10) or (11), wherein, the polar organic solvent of described aprotic is selected from dimethyl sulfoxide (DMSO), dimethyl formamide, acetone, acetonitrile, tetrahydrofuran (THF), Texacar PC or their mixture;
(13) solvent system as described in any one of above-mentioned (10) ~ (12), it is further containing succinimide compound;
(14) solvent system as described in any one of above-mentioned (10) ~ (12), it is further containing sodium halide or potassium halide;
(15) solvent system as described in any one of above-mentioned (10) ~ (14), wherein, described precious metal is selected from gold, palladium, silver or platinum.
Invention effect
According to the present invention, the effect that efficiency with the short period of time and very high reclaims precious metal can be played by easy step.Particularly, in the solution being dissolved with precious metal, only add water just can separate out precious metal, therefore without the need to use organic compound to be used for reduce precious metal and make it separate out in there is epoch-making meaning.Thus, by from separating out except anhydrating in the solution after reclaiming this precious metal, can again reuse as the solvent system being used for precious metal dissolving, therefore not only economical, and there is the advantage of the technique that can realize environment-friendly type, drainage sunk well can be limited in inferior limit.Further, can according to the colour developing of the cupric ion used etc., the carrying out of visual confirmation redox reaction is carried out by the change of solution colour, and highly toxic substance is not used in solvent system, can process under mild conditions near 70 degree of relatively low temperature, therefore can maneuverable in, also excellent than the practicality of prior art.
Accompanying drawing explanation
[Fig. 1] Fig. 1 is for illustrating containing CuBr
2dMSO solution in the graphic representation of time dependent behavior of proof gold meltage.
[Fig. 2] Fig. 2 is for illustrating the graphic representation of the time dependent behavior containing the proof gold meltage in the DMSO solution of CuBr (0.5mmol) and succinimide (0 ~ 20mmol).
[Fig. 3] Fig. 3 is for illustrating the graphic representation of the time dependent behavior containing the proof gold meltage in the DMSO solution of CuBr (2.5mmol) and succinimide (0 ~ 20mmol).
[Fig. 4] Fig. 4 is for illustrating the graphic representation of the time dependent behavior containing the proof gold meltage in the DMSO solution of CuBr (0.5 ~ 2.0mmol) and succinimide (10mmol).
[Fig. 5] Fig. 5 is for illustrating the graphic representation of the time dependent behavior containing the palladium meltage in the DMSO solution of CuBr (0.5 ~ 2.5mmol) and succinimide (10mmol).
Embodiment
Below, embodiments of the present invention are described.Scope of the present invention is not limited to these and illustrates, is not damaging within the scope of present inventive concept, can suitably change during enforcement, even if change outside following example.
The recovery method of the precious metal in the present invention comprises: A) operation of solubilized target precious metal in the solvent system of the organic solvents such as the polar organic solvent containing copper halide and aprotic; And B) in the solvent system being dissolved with described precious metal, add reductive agent, make the operation that this precious metal is separated out.As the precious metal becoming this recovery method object, can preferably enumerate gold, palladium, silver and platinum, also can using the transition metal beyond these or so-called rare metal as recycle object.
In recovery method of the present invention, carry out above-mentioned A) before operation, the arbitrary pretreatment procedure known in the art electronic unit containing precious metal etc. being carried out removing polymer member etc. can also be comprised.Similarly, carry out above-mentioned process B) after, the precious metal reclaiming and separate out can also be comprised, and by arbitrary method known in this area, carry out refining further to this precious metal.
At above-mentioned operation A) in solvent system used be solvent system for dissolving precious metal, typical solvent system is the organic solvent containing copper halide.Below, the formation of this solvent system is described.
As this organic solvent, as long as the precious metal ion (gold ion etc.) by generating with the redox reaction of copper halide can be dissolved, then there is no particular limitation as to it, and hydrophilic organic solvent is applicable, preferably has the organic solvent of the aprotic of polarity.As the example of the polar organic solvent of such aprotic, dimethyl sulfoxide (DMSO) (DMSO), dimethyl formamide (DMF), acetone, acetonitrile, tetrahydrofuran (THF) (THF), N,N-DIMETHYLACETAMIDE, methyl acetate, ethyl acetate, butylacetate, propyl acetate, Texacar PC etc. can be enumerated.Also can for containing their mixed solvent of more than two kinds.Among them, particularly preferably DMSO.
Copper halide used in the present invention is cupric fluoride, cupric chloride, cupric bromide or cupric iodide, can be respectively the salt of 1 valency or divalent.Be preferably monobromination copper (I) (CuBr) or dibrominated copper (II) (CuBr
2).Reclaim the precious metal of target be gold and palladium when, these cupric bromides are preferred, as long as but by generating precious metal ion with the redox reaction of this precious metal, then can use other metal-salt (iron(ic) chloride (FeCl
3) etc.), in addition, when using the precious metal beyond gold and palladium as recovery target, the metal-salt beyond the copper be more suitable for when also allowing use to dissolve.
It is believed that in solvent system, the content of this copper halide is more, then the meltage of precious metal is larger, and typical content is more than 50mmol/L, is preferably more than 100mmol/L, is more preferably more than 200mmol/L.
Further for the purpose of the dissolution rate increasing precious metal and meltage, solvent system used in the present invention can containing succinimide compound or alkali-metal halogenide as ancillary component.The succinimide (succinimide) and succinimide derivatives as known in the art with arbitrary displacement group can also be comprised in succinimide compound.In addition, for alkali-metal halogenide, sodium halide or potassium halide is preferably.As the kind of halogen, preferably it dissociates in a solvent and produces the halide anion (namely when cupric bromide, be preferably Sodium Bromide or Potassium Bromide) identical with above-mentioned copper halide.
More particularly, from the aspect combined with copper halide, when above-mentioned copper halide is CuBr, preferably use succinimide compound, copper halide is CuBr
2when, preferably use Sodium Bromide or Potassium Bromide.By these combination, the dissolving of the precious metal to solvent system can be promoted.
In addition, the content of these other compositions in solvent system is not particularly limited, can is 0.5 ~ 10 times of the concentration of the above-mentioned cupric bromide in solution, preferably uses with the scope of 2 ~ 5 times.
Above-mentioned process B in recovery method of the present invention) in add reductive agent be for optionally making at operation A) in the precious metal ion be dissolved in solution separate out and the reagent reclaimed.Be preferably water, xitix (L-AA), Trisodium Citrate or sodium borohydride (NaBH
4), but be not limited to this, suitable material in reductive agent known in the art can also be used to replace these.
As above-mentioned process B) in reductive agent, preferably use water.Even if water mixes with the organic solvent of above-mentioned solvent system, also can carry out the separation of water after precious metal is separated out, or by this solution of heating, the separation means such as water volatilization easily be removed, therefore can recycle solvent system.For separation, can use well known in the art for from organic solvent except the means of anhydrating (such as, distillation etc.).For the addition of this water, from the aspect of the amount separated out required for precious metal and the efficiency dewatered in order to the recycling of solvent system, relative to solvent system 10mL, the addition of this water is preferably the scope of 2 ~ 40mL, is more preferably 5 ~ 20mL.In addition, the pH of this water is preferably less than 4, is more preferably less than 3, most preferably is about 1.This pH suitably can adjust by adding the acid such as sulfuric acid, hydrochloric acid.By being set to the scope of this pH, when using water as reductive agent, target compound gold only can be made effectively to separate out, suppress the less desirable amount of precipitation of copper, other metals etc.
So, when using water as reductive agent, recovery method of the present invention is separating out described precious metal by above-mentioned operation (B) and after reclaiming, comprise operation (C) further, the water of removing contained by solvent system, obtains the solvent system that can again use in described operation (A).Further, by repeating this operation (A) ~ (C), can recycling be implemented, suppressing the waste liquid of solvent system.
[embodiment]
Below, by embodiment, the present invention is illustrated in further detail, but the present invention is not limited to this.
[embodiment 1]
1. based on the pure gold dissolving of the solvent system containing dibrominated copper (II)
Measure the pure gold dissolution kinetics used containing under the DMSO solution of dibrominated copper (II).In addition, also research is compared for effect when wherein having added Potassium Bromide or Sodium Bromide.
Experiment condition is as follows.Be used in the DMSO of 10ml and be dissolved with 223mg (1mmol) and 446mg (2mmol) dibrominated copper (II) (CuBr
2) solvent system.Make the solvent system wherein containing 2mmol Potassium Bromide or Sodium Bromide respectively.Use the fine rule (φ 0.2mm) of about 235mg (1.2mmol) gold.Solution temperature is set to 70 DEG C.
The time dependent behavior of the pure gold meltage obtained in each solvent composition is shown in Fig. 1.Its result confirms, utilizes solvent system of the present invention to dissolve gold, and no matter in which kind of solvent composition, the meltage of 6 hours gold all reaches capacity.The maximum meltage of known gold and CuBr used
2concentration increase in direct ratio, relative to 3 moles of CuBr
2, roughly can dissolve the gold of 1 mole.In addition, observe that the maximum meltage aspect of gold, relative to 1 mole of CuBr by adding Potassium Bromide and Sodium Bromide
2, be increased to the gold of dissolving 1 mole.It is believed that this is because, by adding Potassium Bromide and Sodium Bromide, the bromide ion in solution increases, and in redox reaction, becomes and easily generates gold ion.
CuBr used herein
2itself is soluble in water, but using water as in the system that solvent uses, gold wait precious metal do not dissolve completely.So above-mentioned result illustrates by combinationally using CuBr
2with the DMSO of aprotic polar organic solvent, can realize effectively dissolving the precious metals such as gold.
[embodiment 2]
2. based on the pure gold dissolving of the solvent system containing monobromination copper (I)
Measure the pure gold dissolution kinetics used containing under the DMSO solution of monobromination copper (I).In addition, also research is compared for effect when wherein having added 0 ~ 20mmol succinimide.In addition, identical with embodiment 1 condition.
Relative to the DMSO of 10ml, make CuBr constant and be 0.5mmol, make succinimide in the range of 0 ~ 20mmol, the time dependent behavior of the proof gold meltage in above-mentioned situation is shown in Fig. 2.This results verification arrives, and when only having the solution of CuBr, near 0.034mmol, meltage reaches capacity, on the other hand, when with the addition of succinimide, and meltage increase about 4 times.
Similarly, make CuBr constant and be 2.5mmol, make succinimide in the range of 0 ~ 20mmol, the time dependent behavior of the proof gold meltage in above-mentioned situation is shown in Fig. 3.Confirm, when only having the solution of CuBr, near 0.3mmol, meltage reaches capacity, on the other hand, when with the addition of succinimide, and meltage increase about 2 times.
In addition, make succinimide constant and be 10mmol, make CuBr in the range of 0 ~ 2.0mmol, the time dependent behavior of the proof gold meltage in above-mentioned situation is shown in Fig. 4.The increase of the meltage of the known gold of this result also depends on the concentration of CuBr.Under the existence of succinimide, the cognation of meltage is: relative to 4 moles of CuBr, roughly dissolves the gold of 1 mole.
[embodiment 3]
3. based on the dissolving of the palladium of the solvent system containing monobromination copper (I)
Measure the pure gold dissolution kinetics used containing under the DMSO solution of monobromination copper (I).Use the fine rule (φ 0.2mm) of about 235mg (2.2mmol) palladium.Solution temperature is set to 70 DEG C.
Make succinimide constant to be 10mmol, to make CuBr in the range of 0.5 ~ 2.5mmol, the time dependent behavior of the palladium meltage in above-mentioned situation is shown in Fig. 5.This result confirms that solvent system of the present invention makes palladium dissolve, the meltage of known palladium and the increase roughly in direct ratio of the concentration of CuBr.When CuBr is 2.5mmol, obtain the result of palladium about 90% dissolving dropped into.
[embodiment 4]
4. the precipitation of dissolution of metals is reclaimed
In the DMSO solution containing monobromination copper (I) and succinimide, dissolve gold, in this solution, add the xitix as reductive agent, gold is separated out, calculates the rate of recovery.
First, various DMSO solution is prepared similarly to Example 2.For solution condition, relative to 10mmolDMSO, CuBr is set to 0.5 ~ 20mmol, succinimide is set to 10 and 20mmol, use 4 kinds of samples (sample 1 ~ sample 4).In this solution, add the fine rule (φ 0.2mm) of about 235mg (1.2mmol) gold, the solubleness after 70 DEG C, 24 hours is listed in table 1.
[table 1]
| Sample 1 | Sample 2 | Sample 3 | Sample 4 | |
| Drop into metal | Gold fine rule | Gold fine rule | Gold fine rule | Gold fine rule |
| Succinimide | 10mmol | 10mmol | 10mmol | 20mmol |
| Cupric bromide | 1.0mmol | 1.5mmol | 2.0mmol | 0.5mmol |
| Drop into weight metal (mg) | 228.4 | 213.4 | 259.2 | 235.7 |
| Gold meltage (mg) | 57 | 64.6 | 100.6 | 24.6 |
In the solvent being dissolved with above-mentioned gold, add L-AA (vitamins C), filter after gold is separated out.Weigh the weight of the precipitate obtained, carry out quantitative analysis by the weight of ICP-AES method to the gold in precipitate and other compositions simultaneously, obtain amount of precipitation and the rate of recovery of gold.Table 2 will be the results are shown in.
[table 2]
| Sample 1 | Sample 2 | Sample 3 | Sample 4 | |
| Gold meltage (mg) | 57 | 64.6 | 100.6 | 24.6 |
| L-AA input amount (mg) | 205.1 | 311.5 | 308 | 101.9 |
| L-AA input amount (mol) | 1.16 | 1.77 | 1.75 | 0.58 |
| Material amount of precipitation (mg) | 176.3 | 182.6 | 225 | 181.8 |
| Gold amount of precipitation (mg) | 57 | 69 | 97 | 24 |
| Copper amount of precipitation (mg) | 11 | 14 | 14 | 5.4 |
| Other materials (mg) | 108.3 | 99.6 | 114 | 152.4 |
| Gold recovery (%) | 100 | 100+ (note) | 96 | 98 |
Note) think that, due to error at measurment etc., the rate of recovery is more than 100%.
As shown in Table 2, by using the L-AA of reductive agent, the rate of recovery of roughly 100% is obtained.This result confirm by the present invention can easy operation and with very high efficiency carry out precious metal precipitation reclaim.
[embodiment 5]
5. the precipitation employing the dissolution of metals of water is reclaimed
Then, in the DMSO solution containing dibrominated copper (II) and Potassium Bromide, dissolve gold, in this solution, add water, gold is separated out, calculates its rate of recovery.
Experiment condition used is as follows.Be used in 10ml DMSO and be dissolved with 446mg (2mmol) cupric bromide (II) (CuBr
2) solvent system.Make the solvent system wherein containing 1mmol Potassium Bromide.In this solution, add about 235mg (1.2mmol) gold fine rule (φ 0.2mm), make its 70 DEG C, dissolve 24 hours.Afterwards, in the solvent system being dissolved with gold, add water, gold filters after separating out.Weigh the weight of the precipitate obtained, carry out quantitative analysis by the weight of ICP-AES method to the gold in precipitate and other compositions simultaneously, obtain amount of precipitation and the rate of recovery of gold.Table 2 will be the results are shown in.Table 3 is the results are shown in by what obtain.
[table 3]
| Sample 5 | Sample 6 | Sample 7 | Sample 8 | Sample 9 | |
| Gold meltage (mg) | 201.1 | 206 | 199.3 | 198.9 | 197.2 |
| Water addition (ml) | 2 | 5 | 10 | 20 | 40 |
| Gold amount of precipitation (mg) | 104.7 | 179.5 | 162.3 | 168.3 | 161 |
| Copper amount of precipitation (mg) | 37.7 | 33.2 | 20.8 | 16.6 | 13.8 |
| Gold recovery (%) | 52 | 87 | 81 | 85 | 82 |
As shown in table 3, for the meltage of gold, all samples are all roughly 200mg.When only adding 2ml water, the amount of precipitation of gold is about 100mg, and the rate of recovery is about 50%, and when adding 5ml, about separate out the gold of 180mg, the rate of recovery is close to 90%.Even if increase the amount of the water added further, the rate of recovery of gold also maintains about 80%.It should be noted that, utilize SEM (scanning electron microscope) to observe the gold particle separated out, result shows that the particle diameter increasing the gold particle of precipitation along with the addition of water exists the trend diminished.So infer the rate of recovery do not reach 100% be because: by add water, although gold all separated out, exist utilize filter opening thick the irretrievable particle of filter paper filtering.
Being confirmed by the result of table 3, by adding water, not using other reductive agent just can carry out the precipitation recovery of precious metal with high-level efficiency.
Claims (15)
1. a recovery method for precious metal, wherein, comprising: operation (A), in the solvent system of the polar organic solvent containing copper halide and aprotic, dissolve precious metal; With operation (B), in the solvent system being dissolved with described precious metal, add reductive agent, this precious metal is separated out.
2. the method for claim 1, wherein described copper halide is selected from monobromination copper (I) or dibrominated copper (II).
3. method as claimed in claim 1 or 2, wherein, the polar organic solvent of described aprotic is selected from dimethyl sulfoxide (DMSO), dimethyl formamide, acetone, acetonitrile, tetrahydrofuran (THF), Texacar PC or their mixture.
4. the method as described in any one of claims 1 to 3, wherein, described solvent system is further containing succinimide compound.
5. the method as described in any one of claims 1 to 3, wherein, described solvent system is further containing sodium halide or potassium halide.
6. the method as described in any one of Claims 1 to 5, wherein, described reductive agent is water, xitix, Trisodium Citrate or sodium borohydride.
7. method as claimed in claim 6, wherein, described reductive agent is water; Separate out described precious metal by described operation (B) and after reclaiming, comprise operation (C) further, remove the water contained in described solvent system, obtaining the solvent system that can again use in described operation (A).
8. method as claimed in claims 6 or 7, wherein, the pH as the water of described reductive agent is less than 4.
9. the method as described in any one of claim 1 ~ 8, wherein, described precious metal is selected from gold, palladium, silver or platinum.
10. a solvent system, it is for dissolving and reclaiming precious metal, and it contains the polar organic solvent of copper halide and aprotic.
11. solvent systems as claimed in claim 10, wherein, described copper halide is selected from monobromination copper (I) or dibrominated copper (II).
12. solvent systems as described in claim 10 or 11, wherein, the polar organic solvent of described aprotic is selected from dimethyl sulfoxide (DMSO), dimethyl formamide, acetone, acetonitrile, tetrahydrofuran (THF), Texacar PC or their mixture.
13. solvent systems as described in any one of claim 10 ~ 12, it is further containing succinimide compound.
14. solvent systems as described in any one of claim 10 ~ 12, it is further containing sodium halide or potassium halide.
15. solvent systems as described in any one of claim 10 ~ 14, wherein, described precious metal is selected from gold, palladium, silver or platinum.
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| JP2013066833 | 2013-03-27 | ||
| JP2013-066833 | 2013-03-27 | ||
| JP2013-127085 | 2013-06-18 | ||
| JP2013127085 | 2013-06-18 | ||
| PCT/JP2014/052415 WO2014156300A1 (en) | 2013-03-27 | 2014-02-03 | Precious metal recovery method using copper halide-containing organic solvent system |
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| CN108179278A (en) * | 2017-12-21 | 2018-06-19 | 浙江理工大学 | A kind of noble metal extracting solution, preparation method and applications |
| CN114807613A (en) * | 2022-04-18 | 2022-07-29 | 上海第二工业大学 | Method for selectively recovering precious metal gold in solid waste by polar aprotic solvent reaction system |
| CN114807612A (en) * | 2022-04-18 | 2022-07-29 | 上海第二工业大学 | Method for selectively recovering noble metal palladium in solid waste by utilizing acetonitrile-anhydrous chloride salt system |
| CN114807611A (en) * | 2022-04-18 | 2022-07-29 | 上海第二工业大学 | Method for gently stripping circuit board metal coating and separating and recovering metal/nonmetal components in substrate |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105154678A (en) * | 2015-09-21 | 2015-12-16 | 华南理工大学 | Efficient environmental-friendly gold extracting method for electronic components of waste mobile phones |
| JP7194975B2 (en) * | 2018-09-21 | 2022-12-23 | 国立大学法人千葉大学 | Method for recovering copper from chalcopyrite and solvent system used for the method |
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2014
- 2014-02-03 WO PCT/JP2014/052415 patent/WO2014156300A1/en active Application Filing
- 2014-02-03 KR KR1020157022470A patent/KR102156227B1/en active IP Right Grant
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108179278A (en) * | 2017-12-21 | 2018-06-19 | 浙江理工大学 | A kind of noble metal extracting solution, preparation method and applications |
| CN108179278B (en) * | 2017-12-21 | 2019-09-20 | 浙江理工大学 | A kind of noble metal extracting solution, preparation method and applications |
| CN114807613A (en) * | 2022-04-18 | 2022-07-29 | 上海第二工业大学 | Method for selectively recovering precious metal gold in solid waste by polar aprotic solvent reaction system |
| CN114807612A (en) * | 2022-04-18 | 2022-07-29 | 上海第二工业大学 | Method for selectively recovering noble metal palladium in solid waste by utilizing acetonitrile-anhydrous chloride salt system |
| CN114807611A (en) * | 2022-04-18 | 2022-07-29 | 上海第二工业大学 | Method for gently stripping circuit board metal coating and separating and recovering metal/nonmetal components in substrate |
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| Publication number | Publication date |
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| WO2014156300A1 (en) | 2014-10-02 |
| JPWO2014156300A1 (en) | 2017-02-16 |
| KR20150136056A (en) | 2015-12-04 |
| KR102156227B1 (en) | 2020-09-15 |
| JP6196662B2 (en) | 2017-09-13 |
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