CN110106505A - It is a kind of remove gold coating composition and its application - Google Patents
It is a kind of remove gold coating composition and its application Download PDFInfo
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- CN110106505A CN110106505A CN201910446903.5A CN201910446903A CN110106505A CN 110106505 A CN110106505 A CN 110106505A CN 201910446903 A CN201910446903 A CN 201910446903A CN 110106505 A CN110106505 A CN 110106505A
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
- C23F1/00—Etching metallic material by chemical means
- C23F1/44—Compositions for etching metallic material from a metallic material substrate of different composition
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- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
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- Organic Chemistry (AREA)
- Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)
Abstract
The invention discloses a kind of compositions for removing gold coating, including sulfamic acid, chloride, surfactant, fatty alcohol polyoxyethylene ether.Still further provide the application method of the composition, comprising the following steps: (1) object for being coated with gold layer with composition is impregnated, is then filtered, filtrate is removed, filter residue is obtained with water again filter residue and obtains thick bronze, it is spare；(2) the thick bronze by step (1) preparation is dried, and is then calcined, and gold powder is made.Compared with the existing technology, composition of the present invention is free of cyanide, is a kind of composition of environment-friendly type, and the gold coating of energy specific aim stripping metal substrate surface, insoluble to gold coating, therefore does not cause the loss of gold.The preparation method and application process of composition of the present invention is simple, is suitble to industrial production, in addition, the purity for the gold powder that the composition extracts through the invention surpasses 94%.
Description
Technical field
The invention belongs to precious metal recycling field, in particular to a kind of composition for removing gold coating and its application.
Background technique
Gold belongs to a kind of precious metal, sufficiently stable, can be used as value preserving object and circulates in money market, also uses
In preparing various ornaments.In addition, in the component surface of some equipment, in order to improve the chemical stability of components,
Have and is realized by way of plating gold.Be coated with gold components scrap after, usual recoverable gold.But the prior art
The reagent or composition of middle recycling gold often contain cyanide.Cyanide has severe toxicity, the industry after being extracted gold from cyanide
Wastewater treatment is difficult, especially constitutes grave danger to soil and surface water to environment, also generates grave danger to human health.
In the prior art to being plated in metallic substrates, for example, Ni-based bottom surface gold coating extraction it is difficult, need to overcome while dissolve
The difficulty of nickel substrate and gold.
Therefore it provides a kind of be free of cyanide, the composition ten of the gold coating of energy specific aim stripping metal substrate surface
Point it is necessary to.
Summary of the invention
In view of the deficiencies of the prior art, the present invention provides a kind of composition for removing gold coating.The composition is free of
Cyanide is a kind of composition of environment-friendly type, and the gold coating of energy specific aim stripping metal substrate surface.
In addition, the present invention also provides the preparation method and application methods of the composition.The composition through the invention
The purity of the gold powder of extraction surpasses 94%.
A kind of composition for removing gold coating, including sulfamic acid, chloride, surfactant, fatty alcohol polyoxy second
Alkene ether.
A kind of composition for removing gold coating, according to parts by weight, including following components:
Preferably, a kind of composition for removing gold coating, according to parts by weight, including following components:
It is further preferred that a kind of composition for removing gold coating, according to parts by weight, including following components:
Preferably, the chloride is at least one of sodium chloride, potassium chloride, ammonium chloride.
Preferably, the surfactant is anionic surfactant.
It is further preferred that the surfactant is dodecyl sodium sulfate, at least one in lauryl sodium sulfate
Kind.
The fatty alcohol polyoxyethylene ether is a kind of bleeding agent.
It preferably, also include pH adjusting agent in the composition, such as hydrochloric acid adjusts the pH of the composition less than 1, example
If pH is 0 or 0.5 or negative value.
A kind of preparation method of composition that removing gold coating, comprising the following steps: dissolve sulfamic acid with water, obtain
Then mixture A is dissolving chloride, surfactant, fatty alcohol polyoxyethylene ether with water, is obtaining mixture B, then will mix
It closes object B and mixture A to be mixed, the composition of the removing gold coating is made.
Preferably, the temperature of the mixing is 10-30 DEG C, and the mixing speed of mixing is 50-200 revs/min,
The time of mixing is 20-40 minutes.
A kind of application of composition that removing gold coating, comprising the following steps:
(1) object (such as some components) for being coated with gold layer is impregnated with composition, is then filtered, and is removed filtrate, is obtained
Filter residue is obtained, filter residue is rinsed with water, obtains thick bronze, it is spare；
(2) the thick bronze by step (1) preparation is dried, and is then calcined, and gold powder is made.
Preferably, the time impregnated in step (1) is 10-25 hours.
Preferably, the temperature impregnated in step (1) is 10-80 DEG C of hour.
Preferably, the object of gold layer is coated in step (1), for example, in components gold layer contact be nickel or nickel alloy
Basal layer (such as calite basal layer).
Preferably, the number being rinsed with water in step (1) is 5-10 times.
Preferably, the temperature dried in step (2) is 40-80 DEG C, and the time of drying is 0.5-1.5 hours.
Preferably, calcining is that Muffle furnace is calcined in step (2).
Preferably, the temperature calcined in step (2) is 800-1200 DEG C, and the time of calcining is 1-3 hours.
Composition of the present invention cannot dissolve gold.In the booster action of surfactant and fatty alcohol polyoxyethylene ether
Under, sulfamic acid, hydrogen ion and chloride ion corrode the interface of gold and nickel (or nickel alloy).Specifically, gold coating
Corrosion with nickel substrate (or nickel alloy base bottom) interface includes that the gold/nickel at (1) interface forms primary battery, sulfamic acid, hydrogen from
Son and chloride ion promote nickel corrosion dissolution；(2) hydrogen ion and chloride ion dissolve the directly etching of nickel；(3) fatty alcohol polyoxy second
Alkene ether, sulfamic acid, hydrogen ion and chloride ion cause gold/nickel interface to form stress corrosion, and gold coating is promoted to separate, and into
The dissolution of one step of row promotion boundary layer nickel.
Compared with the existing technology, beneficial effects of the present invention are as follows:
(1) composition of the present invention is free of cyanide, is a kind of composition of environment-friendly type, and can specific aim stripping metal
The gold coating of substrate surface, it is insoluble to gold coating, therefore do not cause the loss of gold.
(2) the preparation method and application process of composition of the present invention is simple, is suitble to industrial production, in addition, passing through this
The purity for inventing the gold powder that the composition extracts surpasses 94%.
Detailed description of the invention
Fig. 1 is that the SEM of gold powder prepared by the embodiment of the present invention 2 schemes (i.e. scanning electron microscope (SEM) photograph).
Specific embodiment
In order to allow those skilled in the art that technical solution of the present invention is more clearly understood, now enumerate following embodiment into
Row explanation.It should be pointed out that following embodiment to the present invention claims protection scope do not constitute a limitation effect.
Embodiment 1
A kind of composition for removing gold coating, according to parts by weight, including following components:
A kind of preparation method of composition that removing gold coating, comprising the following steps: dissolve amino sulphur with 15 parts of water
Acid obtains mixture A, is then dissolving sodium chloride, dodecyl sodium sulfate, fatty alcohol polyoxyethylene ether with 15 parts of water, is obtaining
To mixture B, then mixture B and mixture A is mixed, the composition of the removing gold coating is made.
The temperature of the mixing is 15 DEG C, and the mixing speed of mixing is 60 revs/min, the time of mixing
It is 40 minutes.
A kind of application of composition that removing gold coating, comprising the following steps:
(1) object for being coated with gold layer is impregnated with composition, is then filtered, filtrate is removed, and is obtained filter residue, is rinsed with water filter
Slag obtains thick bronze, spare；
(2) the thick bronze by step (1) preparation is dried, and is then calcined, and gold powder is made.
The time impregnated in step (1) is 10 hours.
The temperature impregnated in step (1) is 80 DEG C of hours.
The object of gold layer is coated in step (1), for example, in components gold layer contact be Ni-based bottom.
The number being rinsed with water in step (1) is 10 times.
The temperature dried in step (2) is 40 DEG C, and the time of drying is 1.5 hours.
The temperature calcined in step (2) is 800 DEG C, and the time of calcining is 2 hours.
Embodiment 2
A kind of composition for removing gold coating, according to parts by weight, including following components:
The chloride is 5 parts of sodium chloride, 5 parts of potassium chloride.
The surfactant is 1 part of dodecyl sodium sulfate, 1 part of lauryl sodium sulfate.
A kind of preparation method of composition that removing gold coating, comprising the following steps: dissolve amino sulphur with 30 parts of water
Acid obtains mixture A, is then dissolving chloride, surfactant, fatty alcohol polyoxyethylene ether with 30 parts of water, is being mixed
Object B is closed, then mixture B and mixture A is mixed, the composition of the removing gold coating is made.
The temperature of the mixing is 20 DEG C, and the mixing speed of mixing is 100 revs/min, mixing when
Between be 30 minutes.
A kind of application of composition that removing gold coating, comprising the following steps:
(1) object (such as some components) for being coated with gold layer is impregnated with composition, is then filtered, and is removed filtrate, is obtained
Filter residue is obtained, filter residue is rinsed with water, obtains thick bronze, it is spare；
(2) the thick bronze by step (1) preparation is dried, and is then calcined, and gold powder is made.
The time impregnated in step (1) is 24 hours.
The temperature impregnated in step (1) is 50 DEG C of hours.
The object of gold layer is coated in step (1), for example, in components gold layer contact be Ni-based bottom.
The number being rinsed with water in step (1) is 8 times.
The temperature dried in step (2) is 50 DEG C, and the time of drying is 1 hour.
The temperature calcined in step (2) is 900 DEG C, and the time of calcining is 1.5 hours.
Fig. 1 is that the SEM of gold powder prepared by the embodiment of the present invention 2 schemes (i.e. scanning electron microscope (SEM) photograph), and white indicates gold in Fig. 1
Powder particle, black are gaps, illustrate that gold powder obtained is micronised state.
Embodiment 3
A kind of composition for removing gold coating, according to parts by weight, including following components:
Include also acidic ph modifier hydrochloric acid in the composition, adjusts the pH to 5 of the composition.
A kind of preparation method of composition that removing gold coating, comprising the following steps: dissolve sulfamic acid with water, obtain
Then mixture A is dissolving chloride, surfactant, fatty alcohol polyoxyethylene ether with water, is obtaining mixture B, then will mix
It closes object B and mixture A to be mixed, the hydrochloric acid that dropwise addition mass percent is 10% in mixing whipping process, described in adjusting
The composition of the removing gold coating is made in the pH to 5 of composition.
The temperature of the mixing is 30 DEG C, and the mixing speed of mixing is 80 revs/min, the time of mixing
It is 25 minutes.
A kind of application of composition that removing gold coating, comprising the following steps:
(1) object (such as some components) for being coated with gold layer is impregnated with composition, is then filtered, and is removed filtrate, is obtained
Filter residue is obtained, filter residue is rinsed with water, obtains thick bronze, it is spare；
(2) the thick bronze by step (1) preparation is dried, and is then calcined, and gold powder is made.
The time impregnated in step (1) is 15 hours.
The temperature impregnated in step (1) is 60 DEG C of hours.
The object of gold layer is coated in step (1), for example, in components gold layer contact be calite basal layer.
The number being rinsed with water in step (1) is 6 times.
The temperature dried in step (2) is 70 DEG C, and the time of drying is 0.5 hour.
The temperature calcined in step (2) is 1000 DEG C, and the time of calcining is 1.5 hours.
Comparative example 1
Compared with Example 2, chloride is not added in comparative example 1, remaining component and preparation process are same as Example 2.
Comparative example 2
Compared with Example 2, sulfamic acid is not added in comparative example 2, remaining component and preparation process and 2 phase of embodiment
Together.
Comparative example 3
Compared with Example 2, fatty alcohol polyoxyethylene ether is not added in comparative example 3, remaining component and preparation process and reality
It is identical to apply example 2.
Comparative example 4
Compared with Example 2, in comparative example 4 it is a kind of remove gold coating composition application process in calcination temperature
It is 750 DEG C, the time of calcining is 3 hours.Remaining component and preparation process are same as Example 2.
Product measure of merit
The composition prepared in embodiment 2 and comparative example 1-3, which respectively impregnates the identical object for being coated with gold layer, to be recycled
Gold, the quality of gold powder obtained in acetonideexample 2 is 1.2 times of the quality of gold powder obtained in comparative example 1-3,
1.8 times, 1.5 times.
In addition, detecting gold powder in embodiment 1-3 and comparative example 4 by the method for detection fineness of gold commonly used in the art
Purity, in addition also detect the fineness of gold that reagent containing cyanide extracts with same procedure, the results are shown in Table 1.
Table 1:
As it can be seen from table 1 the Huang of the Methods For Purification with the composition and powder that extracts gold from of 1-3 of embodiment of the present invention preparation
The purity of bronze is more than comparative example 4 and the fineness of gold with the reagent extraction containing cyanide.
Claims (10)
1. a kind of composition for removing gold coating, which is characterized in that including sulfamic acid, chloride, surfactant, fat
Alcohol polyoxyethylene ether.
2. composition according to claim 1, which is characterized in that according to parts by weight, including following components:
3. composition according to claim 1 or 2, which is characterized in that the chloride is sodium chloride, potassium chloride, chlorination
At least one of ammonium.
4. composition according to claim 1 or 2, which is characterized in that the surfactant is anion surface active
Agent.
5. composition according to claim 1 or 2, which is characterized in that also include pH adjusting agent in the composition, adjust
The pH of the composition is less than 1.
6. a kind of preparation method of composition according to any one of claims 1-5, which is characterized in that including following step
It is rapid: to dissolve sulfamic acid with water, obtain mixture A, then dissolve chloride, surfactant, aliphatic alcohol polyethenoxy with water
Ether obtains mixture B, then mixture B and mixture A is mixed, and the composition is made.
7. preparation method according to claim 6, which is characterized in that the temperature of the mixing is 10-30 DEG C, mixing
The mixing speed of stirring is 50-200 revs/min, and the time of mixing is 20-40 minutes.
8. a kind of application of composition according to any one of claims 1-5, which comprises the following steps:
(1) object for being coated with gold layer is impregnated with composition, is then filtered, filtrate is removed, and is obtained filter residue, is rinsed with water filter residue,
Thick bronze is obtained, it is spare；
(2) the thick bronze by step (1) preparation is dried, and is then calcined, and gold powder is made.
9. application according to claim 8, which is characterized in that the time impregnated in step (1) is 10-25 hours, is impregnated
Temperature be 10-80 DEG C of hour；Being coated with contact in the object of gold layer with gold layer in step (1) is nickel or nickel alloy base bottom
Layer.
10. application according to claim 8, which is characterized in that the temperature calcined in step (2) is 800-1200 DEG C, is forged
The time of burning is 1-3 hours.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910446903.5A CN110106505A (en) | 2019-05-27 | 2019-05-27 | It is a kind of remove gold coating composition and its application |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910446903.5A CN110106505A (en) | 2019-05-27 | 2019-05-27 | It is a kind of remove gold coating composition and its application |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112553680A (en) * | 2020-11-06 | 2021-03-26 | 福耀汽车铝件(福建)有限公司 | Method for stripping electrophoretic coating on surface of hanger |
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| CN102199772A (en) * | 2010-03-24 | 2011-09-28 | 汉达精密电子(昆山)有限公司 | Formula of magnesium alloy etching solution |
| CN102939396A (en) * | 2010-04-15 | 2013-02-20 | 高级技术材料公司 | Method for recycling of obsolete printed circuit boards |
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| CN112553680A (en) * | 2020-11-06 | 2021-03-26 | 福耀汽车铝件(福建)有限公司 | Method for stripping electrophoretic coating on surface of hanger |
| CN112553680B (en) * | 2020-11-06 | 2021-10-22 | 福耀汽车铝件(福建)有限公司 | Method for stripping electrophoretic coating on surface of hanger |
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