CN114107665A - Film desilvering recovery process - Google Patents
Film desilvering recovery process Download PDFInfo
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- CN114107665A CN114107665A CN202111292737.1A CN202111292737A CN114107665A CN 114107665 A CN114107665 A CN 114107665A CN 202111292737 A CN202111292737 A CN 202111292737A CN 114107665 A CN114107665 A CN 114107665A
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- film
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- silver
- desilvering
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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
- C22B7/00—Working up raw materials other than ores, e.g. scrap, to produce non-ferrous metals and compounds thereof; Methods of a general interest or applied to the winning of more than two metals
- C22B7/006—Wet processes
- C22B7/008—Wet processes by an alkaline or ammoniacal leaching
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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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- Chemical & Material Sciences (AREA)
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- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Organic Chemistry (AREA)
- Geology (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Processing Of Solid Wastes (AREA)
- Manufacture And Refinement Of Metals (AREA)
Abstract
The invention relates to the technical field of film recovery and desilverization, in particular to a film desilverization recovery process. The method comprises the following steps: preprocessing, namely preprocessing the film; dissolving, namely putting the film subjected to pretreatment into an alkaline solution to dissolve silver atoms on the film into the alkaline solution; filtering, namely filtering the solution dissolved with silver to remove solid residues in the solution; replacement, namely putting a displacing agent into the solution and standing; purifying, and purifying the exchanged silver. The film is broken and then is desilvered and dissolved, so that the dissolving efficiency is higher, the dissolving effect is better, the dissolving is more thorough, and the recovery rate of the silver in the film is higher. The liquid alkali solution is adopted to desilverize the film, so that the silver in the film can fall off from the film base to form coarse silver, the coarse silver is deposited at the lower part of the groove, and the desilvering is more thorough.
Description
Technical Field
The invention relates to the technical field of film recovery and desilverization, in particular to a film desilverization recovery process.
Background
Film films are widely used in the fields of printing, development, plate making, and the like. Because the film has large usage amount and high silver content, a large amount of film waste needs to be treated after the film is used up, and the conventional treatment method is usually direct waste, so that the environment is polluted, and the resource waste is easily caused.
Therefore, it is necessary to design a film silver-removing and recycling process to perform harmless treatment on the waste film and recycle the silver in the film, so as to prevent the waste film from polluting the environment, recycle the silver in the film and fully utilize the resources.
Disclosure of Invention
Technical problem to be solved
Aiming at the defects of the prior art, the invention provides a film desilvering recovery process, which carries out innocent treatment on the waste film and recovers silver in the film, thereby preventing the wasted film from polluting the environment, recovering the silver in the film and fully utilizing resources.
(II) technical scheme
In order to achieve the purpose, the invention provides the following technical scheme: a film desilvering recovery process comprises the following steps:
preprocessing, namely preprocessing the film;
dissolving, namely putting the film subjected to pretreatment into an alkaline solution to dissolve silver atoms on the film into the alkaline solution;
filtering, namely filtering the solution dissolved with silver to remove solid residues in the solution;
replacement, namely putting a displacing agent into the solution and standing;
purifying, and purifying the exchanged silver.
In a preferred embodiment of the present invention, the pretreatment includes:
cleaning, namely cleaning the film with clear water to remove stains on the surface of the film;
crushing, namely putting the film into a crusher to crush the film into fragments;
and (3) loading, namely loading the broken film fragments into a dissolving barrel, wherein the dissolving barrel is provided with a sieve hole.
As a preferable embodiment of the present invention, in the above step, the dissolving process includes:
soaking, namely soaking the film in an alkaline solution;
and (4) leaching, leaching the soaked film with clear water, and merging the leaching water into the soaking solution.
As a preferable scheme of the present invention, in the above steps, the soaking and rinsing times are two or more times in the dissolving process.
In a preferred embodiment of the present invention, in the above step, the alkaline solution in the dissolving process is a sodium hydroxide solution.
As a preferable scheme of the invention, in the step, the concentration of the nitric acid solution is 20-45%, the dissolving temperature is 30-90 ℃, and the dissolving time is 10-30 minutes.
In a preferred embodiment of the present invention, in the above step, the substitution agent used in the substitution process is sodium boride.
In a preferred embodiment of the present invention, the time for standing in the substitution step is 24 hours or more.
In a preferred embodiment of the present invention, in the above step, the purification process comprises:
precipitating, namely standing the replaced solution to precipitate solids in the solution;
filtering, namely filtering the precipitated solid;
cleaning, namely cleaning the filtered solids;
pumping out, namely pumping out the cleaned solid;
drying, namely drying the pumped solid;
and (4) identifying, namely identifying the dried solid to determine the silver content of the solid.
(III) advantageous effects
Compared with the prior art, the invention provides a film desilvering recovery process, which has the following beneficial effects:
1. according to the film desilvering recovery process, the film is subjected to desilvering dissolution after being crushed, so that the dissolution efficiency is higher, the dissolution effect is better, the dissolution is more thorough, and the recovery rate of silver in the film is higher;
2. according to the film desilvering recovery process, the film is desilverized by adopting a nitric acid solution, so that the silver in the film can be dissolved into a sodium hydroxide solution to form a silver ion solution, the dissolving effect is good, and the dissolution is thorough;
3. according to the film desilvering recovery process, the sodium boride is adopted to replace the silver in the silver ion solution, the operation is simple, and the replacement effect is good;
drawings
FIG. 1 is a block flow diagram of the present invention;
FIG. 2 is a block diagram of a pre-processing flow in the present invention;
FIG. 3 is a block flow diagram of the dissolution process of the present invention;
FIG. 4 is a block diagram of the purification process of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As described in the background, the prior art has shortcomings, and in order to solve the above technical problems, the present application proposes a process for desilvering and recycling a film.
In an exemplary embodiment of the present application, as shown in fig. 1-4, a process for desilvering and recovering a film comprises the following steps:
preprocessing, namely preprocessing the film;
dissolving, namely putting the film subjected to pretreatment into an alkaline solution to dissolve silver atoms on the film into the alkaline solution;
filtering, namely filtering the solution dissolved with silver to remove solid residues in the solution;
replacement, namely putting a displacing agent into the solution and standing;
purifying, and purifying the exchanged silver.
It can be understood that after the film is pretreated, the silver in the film is dissolved by the alkaline solution, so that the silver in the film is dissolved into the alkaline solution, the solution is filtered, the solid slag in the solution is filtered out to obtain the molten solution, the displacing agent is added into the solution dissolved with the silver for displacement, so that the silver is separated out, and then the separated silver is purified, so that the high-purity silver is obtained. The desilvering process is simple, the operation is convenient, and the desilvering recovery rate is high.
Further, in the above step, the pretreatment includes:
cleaning, namely cleaning the film with clear water to remove stains on the surface of the film;
crushing, namely putting the film into a crusher to crush the film into fragments;
and (3) loading, namely loading the broken film fragments into a dissolving barrel, wherein the dissolving barrel is provided with a sieve hole.
It can be understood that when the film is pretreated, the film is firstly cleaned to remove stains on the surface of the film, and then the film is crushed to improve the dissolving efficiency and the dissolving effect, so that the silver is dissolved more thoroughly, and the recovery rate of the silver in the film is improved.
Further, in the above step, the dissolving process includes:
soaking, namely soaking the film in an alkaline solution;
and (4) leaching, leaching the soaked film with clear water, and merging the leaching water into the soaking solution.
Furthermore, in the above steps, the soaking and rinsing times are two or more times in the dissolving process.
It can be understood that in the dissolving process, the silver in the film is ensured to be completely dissolved into the alkaline solution through repeated soaking-leaching, and the recovery rate of the silver is improved.
Further, in the above step, the alkaline solution in the dissolving process is a sodium hydroxide solution.
Further, in the above steps, the concentration of the nitric acid solution is 20% -45%, the temperature during dissolving is 30-90 ℃, and the dissolving time is 10-30 minutes.
As can be appreciated, the film is desilvered with a sodium hydroxide solution to obtain a silver ion solution.
Further, in the above step, the substitution agent used in the substitution process is sodium boride.
Further, in the above step, the time for standing in the substitution step is 24 hours or more.
It will be appreciated that the replacement of silver in the silver ion solution with sodium boride results in metallic silver and the formation of a silver mud precipitate of the formula 8Ag++BH4 -+3H2O＝8Ag↓+B(OH)3+7H+。
Further, in the above step, the purification process includes:
precipitating, namely standing the replaced solution to precipitate solids in the solution;
filtering, namely filtering the precipitated solid;
cleaning, namely cleaning the filtered solids;
pumping out, namely pumping out the cleaned solid;
drying, namely drying the pumped solid;
and (4) identifying, namely identifying the dried solid to determine the silver content of the solid.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (9)
1. A film desilvering recovery process is characterized by comprising the following steps:
preprocessing, namely preprocessing the film;
dissolving, namely putting the film subjected to pretreatment into an alkaline solution to dissolve silver atoms on the film into the alkaline solution;
filtering, namely filtering the solution dissolved with silver to remove solid residues in the solution;
replacement, namely putting a displacing agent into the solution and standing;
purifying, and purifying the exchanged silver.
2. The desilvering recovery process of the film as claimed in claim 1, wherein in the above steps, the pretreatment comprises:
cleaning, namely cleaning the film with clear water to remove stains on the surface of the film;
crushing, namely putting the film into a crusher to crush the film into fragments;
and (3) loading, namely loading the broken film fragments into a dissolving barrel, wherein the dissolving barrel is provided with a sieve hole.
3. The desilvering recovery process of the film according to claim 1, characterized in that in the above steps, the dissolving process comprises:
soaking, namely soaking the film in an alkaline solution;
and (4) leaching, leaching the soaked film with clear water, and merging the leaching water into the soaking solution.
4. The desilvering recovery process of a film according to claim 3, characterized in that in the above steps, the soaking and rinsing times are two or more times in the dissolving process.
5. The process of claim 1, wherein the alkaline solution used in the dissolution is sodium hydroxide solution.
6. The desilvering recovery process of film films according to claim 5, characterized in that in the above steps, the concentration of the sodium hydroxide solution is 20% -45%, the temperature during dissolution is 30 ℃ -90 ℃, and the dissolution time is 10 minutes-30 minutes.
7. The process of claim 1, wherein in the step of replacing, the replacing agent used is sodium boride.
8. The desilvering recovery process of film according to claim 1, characterized in that in the above step, the standing time in the replacement process is more than 24 hours.
9. The desilvering recovery process of the film as claimed in claim 1, wherein in the above steps, the purification process comprises:
precipitating, namely standing the replaced solution to precipitate solids in the solution;
filtering, namely filtering the precipitated solid;
cleaning, namely cleaning the filtered solids;
pumping out, namely pumping out the cleaned solid;
drying, namely drying the pumped solid;
and (4) identifying, namely identifying the dried solid to determine the silver content of the solid.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111292737.1A CN114107665A (en) | 2021-11-03 | 2021-11-03 | Film desilvering recovery process |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111292737.1A CN114107665A (en) | 2021-11-03 | 2021-11-03 | Film desilvering recovery process |
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| Publication Number | Publication Date |
|---|---|
| CN114107665A true CN114107665A (en) | 2022-03-01 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202111292737.1A Withdrawn CN114107665A (en) | 2021-11-03 | 2021-11-03 | Film desilvering recovery process |
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| CN (1) | CN114107665A (en) |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4279644A (en) * | 1980-06-06 | 1981-07-21 | E. I. Du Pont De Nemours And Company | Recovery of silver from photographic processor effluents |
| CN102452682A (en) * | 2010-10-25 | 2012-05-16 | 张卫 | Recovery process for silver nitrate |
| CN103074500A (en) * | 2012-12-27 | 2013-05-01 | 徐州浩通新材料科技股份有限公司 | Method for producing high-purity silver powder by using silver-containing dead catalyst |
| CN107058757A (en) * | 2017-03-24 | 2017-08-18 | 金川集团股份有限公司 | A kind of production method of the separation of Silver from silver-containing liquid waste |
| CN109835940A (en) * | 2017-11-29 | 2019-06-04 | 菏泽远东强亚化工科技有限公司 | A kind of recovery process of silver nitrate |
| CN110466090A (en) * | 2019-09-10 | 2019-11-19 | 珠海市安能环保科技有限公司 | A method of recycling silver and PET film from HW16 waste photographic film |
| CN112111653A (en) * | 2020-09-29 | 2020-12-22 | 东莞市银辉环保科技有限公司 | Comprehensive utilization and silver recovery processing method for waste film |
| CN113528851A (en) * | 2021-07-26 | 2021-10-22 | 绍兴金冶环保科技有限公司 | Method for recovering silver from silver-containing waste film |
-
2021
- 2021-11-03 CN CN202111292737.1A patent/CN114107665A/en not_active Withdrawn
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4279644A (en) * | 1980-06-06 | 1981-07-21 | E. I. Du Pont De Nemours And Company | Recovery of silver from photographic processor effluents |
| CN102452682A (en) * | 2010-10-25 | 2012-05-16 | 张卫 | Recovery process for silver nitrate |
| CN103074500A (en) * | 2012-12-27 | 2013-05-01 | 徐州浩通新材料科技股份有限公司 | Method for producing high-purity silver powder by using silver-containing dead catalyst |
| CN107058757A (en) * | 2017-03-24 | 2017-08-18 | 金川集团股份有限公司 | A kind of production method of the separation of Silver from silver-containing liquid waste |
| CN109835940A (en) * | 2017-11-29 | 2019-06-04 | 菏泽远东强亚化工科技有限公司 | A kind of recovery process of silver nitrate |
| CN110466090A (en) * | 2019-09-10 | 2019-11-19 | 珠海市安能环保科技有限公司 | A method of recycling silver and PET film from HW16 waste photographic film |
| CN112111653A (en) * | 2020-09-29 | 2020-12-22 | 东莞市银辉环保科技有限公司 | Comprehensive utilization and silver recovery processing method for waste film |
| CN113528851A (en) * | 2021-07-26 | 2021-10-22 | 绍兴金冶环保科技有限公司 | Method for recovering silver from silver-containing waste film |
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Application publication date: 20220301 |