CN103043705A - Technique for recovering silver nitrate - Google Patents
Technique for recovering silver nitrate Download PDFInfo
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- CN103043705A CN103043705A CN 201110310373 CN201110310373A CN103043705A CN 103043705 A CN103043705 A CN 103043705A CN 201110310373 CN201110310373 CN 201110310373 CN 201110310373 A CN201110310373 A CN 201110310373A CN 103043705 A CN103043705 A CN 103043705A
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Abstract
The invention relates to a technique for recovering silver nitrate, belonging to the technical field of chemical engineering. The invention provides a low-pollution high-recovery-rate technique for recovering silver nitrate. The technique comprises the following steps: mechanically pulverizing waste rubber sheets into small substrates, and evenly mixing to facilitate the desilverization by stirring in the solution; putting the pulverized rubber sheets into a 250ml three-neck flask, adding 40ml of 2.0-10.0% nitric acid solution, soaking at 20-80 DEG C for 2-10 minutes 1-4 times to completely dissolve silver on the rubber sheets, filtering, rinsing with distilled water three times, merging the washing liquids into the filtrate, and transffering into a 250ml triangular flask; and by using ferriammonium sulfate as an indicator, titrating with an NH4SCN standard solution until the solution turns to red (end point) from light yellow, recording the volume of the NH4SCN standard solution, and calculating the Ag content on the rubber sheets.
Description
Technical field:
The invention belongs to chemical technology field, in particular, relate to a kind of recovery technique of Silver Nitrate.
Background technology:
Produce various film 800,000,000 m the sensitive materials manufacturing enterprise year of China, wherein medical and industrial equipments flaw detection X-ray film 1,000 ten thousand m have just become waste films after these films uses.Contain silver on these waste films, the sheet base is polyethylene terephthalate, has very high recycling and is worth.The external Special incineration equipment that adopts burns sheet base and printing paper more, to reclaim the silver on the tomb sheet.But after domestic this kind equipment that there is no, waste films are simply burned mostly, reclaim silver from ash, the rate of recovery of silver only is 75%, and remaining enters careful gas with flue gas, to environment.
Summary of the invention:
The present invention is exactly for the problems referred to above, and a kind of recovery technique of polluting the Silver Nitrate little, that the rate of recovery is high is provided.
In order to realize above-mentioned purpose of the present invention, processing step of the present invention is: the waste films mechanical disintegration is become the fritter substrate, and mix, be beneficial to stir the desilverization in solution; Get oddments and put into the 250ml there-necked flask, adding concentration is 2.0%～10.0% salpeter solution 40m1, at 20～80 ℃ of lower 2～10min that soak, soak 1～4 time, the silver on the film is dissolved fully, filter, and with distilled water drip washing three times, in washing lotion and the people's filtrate, move in the people 250ml triangular flask, take ferriammonium sulfate as indicator, use NH
4The titration of SCN standardized solution, until solution is terminal point by faint yellow askew chair redness, record consumes NH
4The volume of SCN standardized solution, the content of Ag on the calculating film.
Beneficial effect of the present invention:
1. the present invention reclaims Silver Nitrate in the discarded film, and resource is fully used;
2. the present invention is not to environment;
3. the rate of recovery of the present invention is 96%.
Embodiment:
Processing step of the present invention is: the waste films mechanical disintegration is become the fritter substrate, and mix, be beneficial to stir the desilverization in solution; Get oddments and put into the 250ml there-necked flask, adding concentration is 2.0%～10.0% salpeter solution 40ml, at 20～80 ℃ of lower 2～10min that soak, soak 1～4 time, the silver on the film is dissolved fully, filter, and with distilled water drip washing three times, in washing lotion and the people's filtrate, move in the people 250ml triangular flask, take ferriammonium sulfate as indicator, use NH
4The titration of SCN standardized solution, until solution is terminal point by faint yellow askew chair redness, record consumes NH
4The volume of SCN standardized solution, the content of Ag on the calculating film.
The present invention selects salpeter solution concentration, soaking temperature, soak time, immersion number of times for affecting the factor of Silver Nitrate leaching yield, can see Table 1, table 2, table 3, table 4.
Table 1 concentration of nitric acid is on the impact of Ag leaching yield
| Silver nitrate concentration/% | 2 | 4 | 6 | 7 | 8 | 10 |
| Leaching yield/% | 61.8 | 72.66 | 90.68 | 100 | 100 | 100 |
Table 2 soaking temperature is on the impact of Ag leaching yield
| Soaking temperature/℃ | 40 | 50 | 70 | 80 |
| Leaching yield/% | 15 | 40 | 100 | 100 |
Table 3 soak time is on the impact of Ag leaching yield
| Soak time/min | 2 | 4 | 6 | 8 | 10 |
| Leaching yield/% | 85 | 98.97 | 100 | 100 | 100 |
Table 4 soaks number of times to the impact of Ag leaching yield
| Soak number of times | 1 | 2 | 3 | 4 |
| Leaching yield/% | 100 | 100 | 78.69 | 9.32 |
As a kind of preferred version, processing step of the present invention is: concentration of nitric acid is 7.0～8.0%, and soaking temperature is 70 ℃, and soak time is 6～8min, and soaking number of times is 2 times.
Claims (2)
1. the recovery technique of a Silver Nitrate is characterized in that, processing step of the present invention is: the waste films mechanical disintegration is become the fritter substrate, and mix, be beneficial to stir the desilverization in solution; Get oddments and put into the 250ml there-necked flask, adding concentration is 2.0%～10.0% salpeter solution 40ml, at 20～80 ℃ of lower 2～10min that soak, soak 1～4 time, the silver on the film is dissolved fully, filter, and with distilled water drip washing three times, in washing lotion and the people's filtrate, move in the people 250ml triangular flask, take ferriammonium sulfate as indicator, use NH
4The titration of SCN standardized solution, until solution is terminal point by faint yellow askew chair redness, record consumes NH
4The volume of SCN standardized solution, the content of Ag on the calculating film.
2. the recovery technique of a kind of Silver Nitrate according to claim 1 is characterized in that, processing step of the present invention is: concentration of nitric acid is 7.0～8.0%, and soaking temperature is 70 ℃, and soak time is 6～8min, and soaking number of times is 2 times.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110310373 CN103043705A (en) | 2011-10-14 | 2011-10-14 | Technique for recovering silver nitrate |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110310373 CN103043705A (en) | 2011-10-14 | 2011-10-14 | Technique for recovering silver nitrate |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103043705A true CN103043705A (en) | 2013-04-17 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201110310373 Pending CN103043705A (en) | 2011-10-14 | 2011-10-14 | Technique for recovering silver nitrate |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103043705A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108008066A (en) * | 2017-11-16 | 2018-05-08 | 西北核技术研究所 | A kind of acidity silver acetylide component determines method |
| 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 |
-
2011
- 2011-10-14 CN CN 201110310373 patent/CN103043705A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108008066A (en) * | 2017-11-16 | 2018-05-08 | 西北核技术研究所 | A kind of acidity silver acetylide component determines method |
| 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 |
| CN110466090B (en) * | 2019-09-10 | 2021-03-30 | 珠海市安能环保科技有限公司 | Method for recovering silver and PET (polyethylene terephthalate) film from HW16 waste photosensitive film |
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| DD01 | Delivery of document by public notice |
Addressee: Xue Kang Document name: Notification of Passing Preliminary Examination of the Application for Invention |
|
| C06 | Publication | ||
| PB01 | Publication | ||
| DD01 | Delivery of document by public notice |
Addressee: Xue Kang Document name: Notification of Publication of the Application for Invention |
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| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20130417 |