CN102260880A - Method for recovering silver in waste silver electrolyte - Google Patents
Method for recovering silver in waste silver electrolyte Download PDFInfo
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- CN102260880A CN102260880A CN2010101892474A CN201010189247A CN102260880A CN 102260880 A CN102260880 A CN 102260880A CN 2010101892474 A CN2010101892474 A CN 2010101892474A CN 201010189247 A CN201010189247 A CN 201010189247A CN 102260880 A CN102260880 A CN 102260880A
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- silver
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- filtrate
- plate
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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 discloses a method for recovering silver in a waste silver electrolyte, and the method comprises the following steps: (1) adding an alkaline solution while stirring the waste silver electrolyte, regulating the pH value of the waste silver electrolyte to 2.5-3, depositing and settling, and then filtering to obtain a filtrate; (2) adding the filtrate into a winning cell, taking a titanium plate as a positive plate and a stainless steel plate as a negative plate for electrowinning, keeping recirculating flow of the filtrate while electrowinning to obtain the silver deposited by electricity on the negative plate. The method for recovering silver in waste silver electrolyte has the advantages of simple process, less raw materials consumption and high recovery rate of silver.
Description
Technical field
The present invention relates to a kind of method that reclaims silver in the useless silver electrolyte.
Background technology
In the electrorefining process of silver, because thick silver contains some impurity, so impurity such as bismuth, lead, copper can enter silver electrolyte along with the electrolytic process of silver when electrolysis, and the electrolytic time is long more, batch many more, the impurity that enters electrolytic solution is just many more, causes the downgrade of electrolytic solution, thereby causes the downgrade of electrolytic silver, therefore electrorefining of silver for some time and batch after, just need handle recovery to electrolytic solution.At present, more common recovery method comprises: the heavy silver of first chlorination, use ammoniacal liquor---hydrazine hydrate reduction then; Adopt the copper method of replacing to reclaim.The former need consume a large amount of materials such as ammoniacal liquor, and the latter can only be recovered to thick silver, and purity is lower, and needs to consume a large amount of copper, and cost is higher.
Summary of the invention
The purpose of this invention is to provide a kind of method that reclaims silver in the useless silver electrolyte, process is simple, and supplies consumption is less, and the rate of recovery of silver is higher.
The object of the present invention is achieved like this:
A kind of method that reclaims silver in the useless silver electrolyte may further comprise the steps:
(1) when stirring useless silver electrolyte, adds alkali lye, the pH value of useless silver electrolyte is adjusted into 2.5～3, place heavy clear after-filtration, obtain filtrate;
(2) filtrate being added Winning cell, is positive plate with the titanium plate, is that negative plate carries out electrodeposition with the stainless steel plate, keeps filtrate cycle to flow during electrodeposition, obtains the silver that is come out by galvanic deposit on negative plate.
Wherein, with alkali lye will give up the pH value of silver electrolyte be adjusted into 2.5～3 refilter after, the bismuth in the useless silver electrolyte is precipitated to come out, when filtrate is carried out galvanic deposit, silver ions wherein constantly by galvanic deposit to negative plate, obtain electrodeposition silver.The concentration ratio of the silver ions in the filtrate is higher at the beginning, the purity of the silver that reclaims is also higher, along with galvanic deposit continue carry out, the concentration of silver ions is more and more lower in the filtrate, the purity that reclaims silver is also more and more lower, but disposable collecting when therefore collecting also can be according to the silver of different time period Fractional Collectionses to different purity.
Preferably, in the step of the present invention (1), the concentration of alkali lye is 20%～30%.Described alkali lye is sodium hydroxide solution or ammoniacal liquor.In the described step (2), the bath voltage of described Winning cell is 1.5～2.5V.
Therefore compared with prior art, the present invention has following beneficial effect:
The present invention adopts the silver in the useless silver electrolyte of electrodip process recovery, process is fairly simple, only need a spot of alkali lye, and do not need to consume a large amount of materials, the rate of recovery advantages of higher of silver, direct yield reaches 95%, and the rate of recovery reaches 99%, electrodeposition reclaims content 〉=95% of silver, mother liquor can be again through heavy silver-colored after the liquid argentiferous less than 0.001g/L.
Embodiment
Describe the present invention in detail below in conjunction with specific embodiment, be used for explaining the present invention in this illustrative examples of the present invention and explanation, but not as a limitation of the invention.
Embodiment one
Reclaim silver in the useless silver electrolyte according to the following step:
(1) adding concentration when stirring useless silver electrolyte is 20% ammoniacal liquor, and the pH value of useless silver electrolyte is adjusted into 2.5, places heavy clear after-filtration, obtains filtrate;
(2) filtrate being added Winning cell, is positive plate with the titanium plate, is that negative plate carries out electrodeposition with the stainless steel plate, keeps filtrate cycle to flow during electrodeposition, and the voltage of Winning cell is 1.5V, obtains the silver that is come out by galvanic deposit on negative plate.
Embodiment two
Reclaim silver in the useless silver electrolyte according to the following step:
(1) adding concentration when stirring useless silver electrolyte is 30% ammoniacal liquor, and the pH value of useless silver electrolyte is adjusted into 3, places heavy clear after-filtration, obtains filtrate;
(2) filtrate being added Winning cell, is positive plate with the titanium plate, is that negative plate carries out electrodeposition with the stainless steel plate, keeps filtrate cycle to flow during electrodeposition, and the voltage of Winning cell is 2.5V, obtains the silver that is come out by galvanic deposit on negative plate.
Embodiment three
Reclaim silver in the useless silver electrolyte according to the following step:
(1) adding concentration when stirring useless silver electrolyte is 30% sodium hydroxide solution, and the pH value of useless silver electrolyte is adjusted into 2.6, places heavy clear after-filtration, obtains filtrate;
(2) filtrate being added Winning cell, is positive plate with the titanium plate, is that negative plate carries out electrodeposition with the stainless steel plate, keeps filtrate cycle to flow during electrodeposition, and the voltage of Winning cell is 2.4V, obtains the silver that is come out by galvanic deposit on negative plate.
Embodiment four
Reclaim silver in the useless silver electrolyte according to the following step:
(1) adding concentration when stirring useless silver electrolyte is 20% sodium hydroxide solution, and the pH value of useless silver electrolyte is adjusted into 2.7, places heavy clear after-filtration, obtains filtrate;
(2) filtrate being added Winning cell, is positive plate with the titanium plate, is that negative plate carries out electrodeposition with the stainless steel plate, keeps filtrate cycle to flow during electrodeposition, and the voltage of Winning cell is 2V, obtains the silver that is come out by galvanic deposit on negative plate.
Embodiment five
Reclaim silver in the useless silver electrolyte according to the following step:
(1) adding concentration when stirring useless silver electrolyte is 25% sodium hydroxide solution, and the pH value of useless silver electrolyte is adjusted into 2.8, places heavy clear after-filtration, obtains filtrate;
(2) filtrate being added Winning cell, is positive plate with the titanium plate, is that negative plate carries out electrodeposition with the stainless steel plate, keeps filtrate cycle to flow during electrodeposition, and the voltage of Winning cell is 1.6V, obtains the silver that is come out by galvanic deposit on negative plate.
Embodiment five
Reclaim silver in the useless silver electrolyte according to the following step:
(1) adding concentration when stirring useless silver electrolyte is 24% ammoniacal liquor, and the pH value of useless silver electrolyte is adjusted into 2.9, places heavy clear after-filtration, obtains filtrate;
(2) filtrate being added Winning cell, is positive plate with the titanium plate, is that negative plate carries out electrodeposition with the stainless steel plate, keeps filtrate cycle to flow during electrodeposition, and the voltage of Winning cell is 1.8V, obtains the silver that is come out by galvanic deposit on negative plate.
More than the technical scheme that the embodiment of the invention provided is described in detail, used specific case herein the principle and the embodiment of the embodiment of the invention are set forth, the explanation of above embodiment only is applicable to the principle that helps to understand the embodiment of the invention; Simultaneously, for one of ordinary skill in the art, according to the embodiment of the invention, the part that on embodiment and range of application, all can change, in sum, this description should not be construed as limitation of the present invention.
Claims (4)
1. one kind is reclaimed silver-colored method in the useless silver electrolyte, it is characterized in that may further comprise the steps:
(1) when stirring useless silver electrolyte, adds alkali lye, the pH value of useless silver electrolyte is adjusted into 2.5～3, place heavy clear after-filtration, obtain filtrate;
(2) filtrate being added Winning cell, is positive plate with the titanium plate, is that negative plate carries out electrodeposition with the stainless steel plate, keeps filtrate cycle to flow during electrodeposition, obtains the silver that is come out by galvanic deposit on negative plate.
2. the method for silver in the useless silver electrolyte of recovery according to claim 1, it is characterized in that: in the described step (1), the concentration of alkali lye is 20%～30%.
3. the method for silver in the useless silver electrolyte of recovery according to claim 1, it is characterized in that: in the described step (1), alkali lye is sodium hydroxide solution or ammoniacal liquor.
4. the method for silver in the useless silver electrolyte of the described recovery of claim 1, it is characterized in that: in the described step (2), the bath voltage of described Winning cell is 1.5～2.5V.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010101892474A CN102260880A (en) | 2010-05-26 | 2010-05-26 | Method for recovering silver in waste silver electrolyte |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010101892474A CN102260880A (en) | 2010-05-26 | 2010-05-26 | Method for recovering silver in waste silver electrolyte |
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| Publication Number | Publication Date |
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| CN102260880A true CN102260880A (en) | 2011-11-30 |
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| CN2010101892474A Pending CN102260880A (en) | 2010-05-26 | 2010-05-26 | Method for recovering silver in waste silver electrolyte |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2019056837A1 (en) * | 2017-09-21 | 2019-03-28 | 中国科学院过程工程研究所 | Clean extraction method for metal silver |
| CN112410828A (en) * | 2020-11-24 | 2021-02-26 | 深圳市贵金装备科技有限公司 | Process for preparing high-purity silver by high-concentration silver nitrate electrodeposition method |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1339619A (en) * | 2000-08-23 | 2002-03-13 | 内蒙古乾坤金银精炼股份有限公司 | Method for removing bismuth and antiomny from silver electrolyte |
-
2010
- 2010-05-26 CN CN2010101892474A patent/CN102260880A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1339619A (en) * | 2000-08-23 | 2002-03-13 | 内蒙古乾坤金银精炼股份有限公司 | Method for removing bismuth and antiomny from silver electrolyte |
Non-Patent Citations (1)
| Title |
|---|
| HIROSHI IMAZAWA等: "银的连续电解精炼", 《有色冶炼》, no. 2, 2 March 1985 (1985-03-02) * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2019056837A1 (en) * | 2017-09-21 | 2019-03-28 | 中国科学院过程工程研究所 | Clean extraction method for metal silver |
| US11566333B2 (en) | 2017-09-21 | 2023-01-31 | Institute Of Process Engineering, Chinese Academy Of Sciences | Method for cleanly extracting metallic silver |
| CN112410828A (en) * | 2020-11-24 | 2021-02-26 | 深圳市贵金装备科技有限公司 | Process for preparing high-purity silver by high-concentration silver nitrate electrodeposition method |
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Application publication date: 20111130 |