CN1456713A - Cyclic reuse of waste water from chrome plating, nickling, cyanide electroplating and acid coppering - Google Patents
Cyclic reuse of waste water from chrome plating, nickling, cyanide electroplating and acid coppering Download PDFInfo
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- CN1456713A CN1456713A CN 03126642 CN03126642A CN1456713A CN 1456713 A CN1456713 A CN 1456713A CN 03126642 CN03126642 CN 03126642 CN 03126642 A CN03126642 A CN 03126642A CN 1456713 A CN1456713 A CN 1456713A
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- electroplating
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Abstract
A process for reclaiming the used electroplating liquid includes such steps as collecting said used electroplating liquid, concentrating, purifying by ion exchange, chemical purifying, or low-current reverse electrolyzing, adding new reagent, and returning it back to electroplating system. Its advantages are low cost and no pollution.
Description
Technical field
The present invention relates to a kind of electroplating waste processing process, particularly a kind of technology with waste water circulation in the electroplating process.
Background technology
Electroplating wastewater can be divided into by feature in electroplating industry: chromium is that waste water, cyanogen are waste water, heavy metal wastewater thereby etc., these waste water have the advantages that kind is many, toxicity is big, belong to a national class Hazardous wastes, do not handle discharging arbitrarily, will produce very serious destruction ecotope if be added on.Along with present environmental protection requirement increasingly stringent, the production that cleans of electroplating process has become very urgent.
What traditional electroplating wastewater improvement method adopted usually is: various electroplating wastewater mixed solutions are carried out alkali oxide cyanogen, reduction high valence chrome, hydrolytic precipitation; Perhaps different classification of wastes is collected, cyanide wastewater is carried out oxidation, chromate waste water is reduced, mix with the soda acid scavenging solution then, concentrate together and precipitate, make drainage water reach the emission standard of country.The processing thinking that this is a kind of " discharging earlier, back are administered ".But it has brought serious day by day pollution still for our environment, and has a series of deficiency: 1: this art breading flow process complexity, and processing cost is quite high; 2: even handle up to standardly, they will discharge a large amount of pollutents, cause increasing destruction to existent environment of people; 3: " objectionable impurities " of these dischargings is again expensive metal ion or electroplating additive, and its discharging has caused the heavy losses of valuable resource; 4: the water consumption of this traditional technology is also very huge, and it not only causes the rising of production cost, also makes the water resources of our growing tension more nervous.
Summary of the invention
In order to overcome above-mentioned production technique deficiency, the invention provides a kind of novel process with acid coppering, cyanide electroplating, nickel plating, chromed electroplating wastewater cyclically utilizing.
The present invention solves the problems of the technologies described above the technical scheme that is adopted: (1) is with acid coppering, cyanide electroplating, nickel plating, chromed electroplating wastewater is collected respectively in the corresponding receiving tank, (2) use concentration evaporator to carry out concentration the electroplating wastewater of collecting, (3) electroplating wastewater after will handling in purification tank by ion exchange method or the chemical purification or the low current back-electrolysis method of purification or use above three kinds of methods to mutually combine and carry out purifying treatment, (4), after being mixed with the additional liquid of plating, the new reagent of requirement interpolation coming back to electroplating system by electroplating in the liquid pool with the liquid after the thickening-purification technology processing.
The invention has the beneficial effects as follows: because this patent invention is by with acid coppering, cyanide electroplating, nickel plating, chromed electroplating wastewater categorised collection, handle respectively then, regenerate and turn back in the electroplating system and reuse, thereby avoided the discharging of deleterious prussiate, chromium ion and other heavy metal ion effectively fully, realized cleaner production; And the processing costs of the waste liquid of this technology is low, can significantly reduce the consumption of various additives simultaneously, also recycles, reduces the purpose that water rate reduces production costs significantly thereby reach because there is quite a few to return electroplating system.
Embodiment
A kind of novel process with acid coppering, cyanide electroplating, nickel plating, chromed electroplating wastewater cyclically utilizing is as follows:
(1) acid coppering, cyanide electroplating, nickel plating, chromed electroplating wastewater are collected respectively in the corresponding receiving tank, the processing condition of its collection are:
Acid coppering waste water: in electroplating system, adopt the rinsing of 6-12 stage countercurrent, with the dense wash water income receiving tank of last step.
Cyanide electroplating waste water: in electroplating system, adopt the rinsing of 6-15 stage countercurrent, with the dense wash water income receiving tank of last step.
Nickel-plating waste water: in electroplating system, adopt the rinsing of 4-10 stage countercurrent, with the dense wash water income receiving tank of last step.
Chromium plating wastewater: in electroplating system, adopt the rinsing of 10-16 stage countercurrent, the dense wash water income receiving tank of last step.
This step is to set up corresponding collection plated item to clean liquid bath respectively according to actual galvanized kind of waste water in producing, the method of its collection is with the dense wash water income of last step receiving tank, because dense wash water metal ion of last step or electroplating additive concentration height, so that descend the concentration of step.And the dense wash water of described last step refers to the electroplating wastewater that cleans the first time of carrying out after plating piece is electroplated in the usefulness groove.After the dense wash water of last step is collected, the water in the rinse bath of back is passed forward, and added clear water in the last groove, thereby avoided expensive metal ion or electroplating additive outwards to run off.
(2) will use concentration evaporator to carry out concentration through the electroplating wastewater that collect step (1); Concentration evaporator will be for will adopt film under vacuum vaporizer and atmospheric evaporation device respectively according to electroplating wastewater feature difference, and the processing condition of its concentration are:
Acid coppering waste water: vaporization temperature is 60-100 ℃, and vacuum tightness is 400-1200mmH
2O;
The 1.0-1.8 that is evaporated to cupric concentration and is the normal electrical plating bath doubly finishes.
Cyanide electroplating waste water: vaporization temperature is 60-100 ℃, and vacuum tightness is 400-1200mmH
2O;
Be evaporated to that to contain cyanogen concentration be that the 1.0-1.5 of normal electrical plating bath doubly finishes.
Nickel-plating waste water: vaporization temperature is 50-90 ℃, carries out under normal pressure; Be evaporated to and contain nickel concentration
For the 1.0-1.8 of normal electrical plating bath doubly finishes.
Chromium plating wastewater: vaporization temperature is 60-100 ℃, and vacuum tightness is 400-1200mmH
2O steams
Send to that to contain cyanogen concentration be that the 1.0-1.8 of normal electrical plating bath doubly finishes.
Processing condition in this step are not limited to above-mentioned condition, can carry out corresponding concentration and evaporation according to the different situations and the needs of each factory, and in order to make concentrated effect best, should adopt following processing condition:
Acid coppering waste water: vaporization temperature is 80-100 ℃, and vacuum tightness is 500-900mmH
2O;
The 1.0-1.5 that is evaporated to cupric concentration and is the normal electrical plating bath doubly finishes.
Cyanide electroplating waste water: vaporization temperature is 80-100 ℃, and vacuum tightness is 500-900mmH
2O;
Be evaporated to that to contain cyanogen concentration be that the 1.0-1.3 of normal electrical plating bath doubly finishes.
Nickel-plating waste water: vaporization temperature is 60-90 ℃, carries out under normal pressure; Be evaporated to and contain nickel concentration
For the 1.0-1.5 of normal electrical plating bath doubly finishes.
Chromium plating wastewater: vaporization temperature is 80-100 ℃, and vacuum tightness is 500-900mmH
2O; Steam
Send to that to contain cyanogen concentration be that the 1.0-1.5 of normal electrical plating bath doubly finishes.
(3) electroplating wastewater after step (2) concentration carries out purifying treatment in purification tank, because so plated item has avoided being mixed with various ions through various rinse bath difficulties in receiving tank in galvanized process, we have only through purifying treatment could guarantee that the plating of making later replenishes liquid purity, thereby has guaranteed the yield rate of plated item.The method of purifying treatment adopts ion exchange method or the chemical purification or the low current back-electrolysis method of purification or uses above three kinds of methods to mutually combine, and can adopt according to the needs of different factories
With different purifying treatment methods, the processing condition of its purifying treatment are: ion exchange method: pH value between 3～4, most optimal retention time is 5～10min. low current back-electrolysis method of purification: adopt electroplating process back-electrolysis condition commonly used.Chemical purification: add and to go copper agent etc. to be purified.
(4) will in liquid pool, be mixed with the additional liquid of plating through the liquid after the processing of step (3) thickening-purification technology, will electroplate additional liquid at last and render to electroplating system by electroplating the new reagent of requirement interpolation.
So liquid after thickening-purification technology in this step is handled and the composition of electroplating additional liquid and incomplete same are by adding required reagent as required after the analyzing and testing.
This technology has been avoided harmful cyanide, chromium ion and other heavy metal effectively fully The discharging of ion realizes cleaner production, and expensive metal ion and plating are added Add agent and effectively reclaim use.
Claims (6)
1. novel process with acid coppering, cyanide electroplating, nickel plating, chromed electroplating wastewater cyclically utilizing, its processing step is as follows:
(1) acid coppering, cyanide electroplating, nickel plating, chromed electroplating wastewater are collected respectively in the corresponding receiving tank;
(2) will use concentration evaporator to carry out concentration through the electroplating wastewater that collect step (1);
(3) will through the electroplating wastewater after step (2) concentration in purification tank by ion exchange method or the chemical purification or the low current back-electrolysis method of purification or use above three kinds of methods to mutually combine and carry out purifying treatment, transport liquid pool again to.
(4) will after being mixed with the additional liquid of plating, the new reagent of requirement interpolation come back to electroplating system by electroplating in the liquid pool through the liquid after step (3) thickening-purification technology is handled.
2. a kind of novel process with acid coppering, cyanide electroplating, nickel plating, chromed electroplating wastewater cyclically utilizing according to claim 1 is characterized in that the processing condition that the described electroplating wastewater of step (1) is collected are:
Acid coppering waste water: in electroplating system, adopt the rinsing of 6-12 stage countercurrent, with the dense wash water income receiving tank of last step.
Cyanide electroplating waste water: in electroplating system, adopt the rinsing of 6-15 stage countercurrent, with the dense wash water income receiving tank of last step.
Nickel-plating waste water: in electroplating system, adopt the rinsing of 4-10 stage countercurrent, with the dense wash water income receiving tank of last step.
Chromium plating wastewater: in electroplating system, adopt the rinsing of 10-16 stage countercurrent, with the dense wash water income receiving tank of last step.
3. a kind of novel process with acid coppering, cyanide electroplating, nickel plating, chromed electroplating wastewater cyclically utilizing according to claim 1 is characterized in that the described concentration evaporator of step (2) is film under vacuum vaporizer or atmospheric evaporation device.
4. according to the described a kind of novel process of claim 1, it is characterized in that the processing condition of the described concentration of step (2) are with acid coppering, cyanide electroplating, nickel plating, chromed electroplating wastewater cyclically utilizing:
Acid coppering waste water: vaporization temperature is 60-100 ℃, and vacuum tightness is 400-1200mmH
2O;
The 1.0-1.8 that is evaporated to cupric concentration and is the normal electrical plating bath doubly finishes.
Cyanide electroplating waste water: vaporization temperature is 60-100 ℃, and vacuum tightness is 400-1200mm
H
2O; Be evaporated to and contain the 1.0-1.5 that cyanogen concentration is the normal electrical plating bath
Doubly finish.
Nickel-plating waste water: vaporization temperature is 50-95 ℃, carries out under normal pressure; Be evaporated to nickeliferous dense
Degree doubly finishes for the 1.0-1.8 of normal electrical plating bath.
Chromium plating wastewater: vaporization temperature is 80-100 ℃, and vacuum tightness is 400-1200mmH
2O;
Be evaporated to that to contain cyanogen concentration be that the 1.0-1.8 of normal electrical plating bath doubly finishes.
5. according to the processing condition of the described concentration of claim 4, it is characterized in that best concentration processing condition are:
Acid coppering waste water: vaporization temperature is 80-100 ℃, and vacuum tightness is 500-900mmH
2O;
The 1.0-1.5 that is evaporated to cupric concentration and is the normal electrical plating bath doubly finishes.
Cyanide electroplating waste water: vaporization temperature is 80-100 ℃, and vacuum tightness is 500-900mmH
2O;
Be evaporated to that to contain cyanogen concentration be that the 1.0-1.3 of normal electrical plating bath doubly finishes.
Nickel-plating waste water: vaporization temperature is 60-90 ℃, carries out under normal pressure; Be evaporated to nickeliferous dense
Degree doubly finishes for the 1.0-1.5 of normal electrical plating bath.
Chromium plating wastewater: vaporization temperature is 80-100 ℃, and vacuum tightness is 500-900mmH
2O; Steam
Send to that to contain cyanogen concentration be that the 1.0-1.5 of normal electrical plating bath doubly finishes.
6. according to the described a kind of novel process of claim 1, it is characterized in that the processing condition of the described purifying treatment of step (3) are with acid coppering, cyanide electroplating, nickel plating, chromed electroplating wastewater cyclically utilizing:
Ion exchange method: pH value between 3～4, most optimal retention time is 5～10min..
The low current back-electrolysis method of purification: adopt electroplating process back-electrolysis condition commonly used.
Chemical purification: add and to go copper agent etc. to be purified.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03126642 CN1456713A (en) | 2003-05-20 | 2003-05-20 | Cyclic reuse of waste water from chrome plating, nickling, cyanide electroplating and acid coppering |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03126642 CN1456713A (en) | 2003-05-20 | 2003-05-20 | Cyclic reuse of waste water from chrome plating, nickling, cyanide electroplating and acid coppering |
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|---|---|
| CN1456713A true CN1456713A (en) | 2003-11-19 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 03126642 Pending CN1456713A (en) | 2003-05-20 | 2003-05-20 | Cyclic reuse of waste water from chrome plating, nickling, cyanide electroplating and acid coppering |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100341801C (en) * | 2004-12-20 | 2007-10-10 | 上海轻工业研究所有限公司 | Method for recovering nickel and removing impurity from nickel-plated wastewater |
| CN100354215C (en) * | 2006-01-18 | 2007-12-12 | 梁林标 | Zero-discharge reclamation method of electroplating wastewater and apparatus thereof |
| CN102080255A (en) * | 2010-12-01 | 2011-06-01 | 山东建筑大学 | Method for recycling laboratory bright nickel plating waste liquid |
| CN101717135B (en) * | 2009-12-04 | 2012-05-30 | 浙江师范大学 | Method for treating nickel-containing electroplating wastewater and recovering nickel by electrolysis |
-
2003
- 2003-05-20 CN CN 03126642 patent/CN1456713A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100341801C (en) * | 2004-12-20 | 2007-10-10 | 上海轻工业研究所有限公司 | Method for recovering nickel and removing impurity from nickel-plated wastewater |
| CN100354215C (en) * | 2006-01-18 | 2007-12-12 | 梁林标 | Zero-discharge reclamation method of electroplating wastewater and apparatus thereof |
| CN101717135B (en) * | 2009-12-04 | 2012-05-30 | 浙江师范大学 | Method for treating nickel-containing electroplating wastewater and recovering nickel by electrolysis |
| CN102080255A (en) * | 2010-12-01 | 2011-06-01 | 山东建筑大学 | Method for recycling laboratory bright nickel plating waste liquid |
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